Include ol3 v3.12.1

3 files changed, 134912 insertions, 0 deletions

diff --git a/chimere/static/ol3/ol-debug.js b/chimere/static/ol3/ol-debug.js
new file mode 100644
index 0000000..5bf1864
--- /dev/null
+++ b/chimere/static/ol3/ol-debug.js
@@ -0,0 +1,133887 @@
+// OpenLayers 3. See http://openlayers.org/
+// License: https://raw.githubusercontent.com/openlayers/ol3/master/LICENSE.md
+// Version: v3.12.1
+
+(function (root, factory) {
+  if (typeof exports === "object") {
+    module.exports = factory();
+  } else if (typeof define === "function" && define.amd) {
+    define([], factory);
+  } else {
+    root.ol = factory();
+  }
+}(this, function () {
+  var OPENLAYERS = {};
+  var goog = this.goog = {};
+this.CLOSURE_NO_DEPS = true;
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Bootstrap for the Google JS Library (Closure).
+ *
+ * In uncompiled mode base.js will write out Closure's deps file, unless the
+ * global <code>CLOSURE_NO_DEPS</code> is set to true.  This allows projects to
+ * include their own deps file(s) from different locations.
+ *
+ * @author arv@google.com (Erik Arvidsson)
+ *
+ * @provideGoog
+ */
+
+
+/**
+ * @define {boolean} Overridden to true by the compiler when
+ *     --process_closure_primitives is specified.
+ */
+var COMPILED = false;
+
+
+/**
+ * Base namespace for the Closure library.  Checks to see goog is already
+ * defined in the current scope before assigning to prevent clobbering if
+ * base.js is loaded more than once.
+ *
+ * @const
+ */
+var goog = goog || {};
+
+
+/**
+ * Reference to the global context.  In most cases this will be 'window'.
+ */
+goog.global = this;
+
+
+/**
+ * A hook for overriding the define values in uncompiled mode.
+ *
+ * In uncompiled mode, {@code CLOSURE_UNCOMPILED_DEFINES} may be defined before
+ * loading base.js.  If a key is defined in {@code CLOSURE_UNCOMPILED_DEFINES},
+ * {@code goog.define} will use the value instead of the default value.  This
+ * allows flags to be overwritten without compilation (this is normally
+ * accomplished with the compiler's "define" flag).
+ *
+ * Example:
+ * <pre>
+ *   var CLOSURE_UNCOMPILED_DEFINES = {'goog.DEBUG': false};
+ * </pre>
+ *
+ * @type {Object<string, (string|number|boolean)>|undefined}
+ */
+goog.global.CLOSURE_UNCOMPILED_DEFINES;
+
+
+/**
+ * A hook for overriding the define values in uncompiled or compiled mode,
+ * like CLOSURE_UNCOMPILED_DEFINES but effective in compiled code.  In
+ * uncompiled code CLOSURE_UNCOMPILED_DEFINES takes precedence.
+ *
+ * Also unlike CLOSURE_UNCOMPILED_DEFINES the values must be number, boolean or
+ * string literals or the compiler will emit an error.
+ *
+ * While any @define value may be set, only those set with goog.define will be
+ * effective for uncompiled code.
+ *
+ * Example:
+ * <pre>
+ *   var CLOSURE_DEFINES = {'goog.DEBUG': false} ;
+ * </pre>
+ *
+ * @type {Object<string, (string|number|boolean)>|undefined}
+ */
+goog.global.CLOSURE_DEFINES;
+
+
+/**
+ * Returns true if the specified value is not undefined.
+ * WARNING: Do not use this to test if an object has a property. Use the in
+ * operator instead.
+ *
+ * @param {?} val Variable to test.
+ * @return {boolean} Whether variable is defined.
+ */
+goog.isDef = function(val) {
+  // void 0 always evaluates to undefined and hence we do not need to depend on
+  // the definition of the global variable named 'undefined'.
+  return val !== void 0;
+};
+
+
+/**
+ * Builds an object structure for the provided namespace path, ensuring that
+ * names that already exist are not overwritten. For example:
+ * "a.b.c" -> a = {};a.b={};a.b.c={};
+ * Used by goog.provide and goog.exportSymbol.
+ * @param {string} name name of the object that this file defines.
+ * @param {*=} opt_object the object to expose at the end of the path.
+ * @param {Object=} opt_objectToExportTo The object to add the path to; default
+ *     is |goog.global|.
+ * @private
+ */
+goog.exportPath_ = function(name, opt_object, opt_objectToExportTo) {
+  var parts = name.split('.');
+  var cur = opt_objectToExportTo || goog.global;
+
+  // Internet Explorer exhibits strange behavior when throwing errors from
+  // methods externed in this manner.  See the testExportSymbolExceptions in
+  // base_test.html for an example.
+  if (!(parts[0] in cur) && cur.execScript) {
+    cur.execScript('var ' + parts[0]);
+  }
+
+  // Certain browsers cannot parse code in the form for((a in b); c;);
+  // This pattern is produced by the JSCompiler when it collapses the
+  // statement above into the conditional loop below. To prevent this from
+  // happening, use a for-loop and reserve the init logic as below.
+
+  // Parentheses added to eliminate strict JS warning in Firefox.
+  for (var part; parts.length && (part = parts.shift());) {
+    if (!parts.length && goog.isDef(opt_object)) {
+      // last part and we have an object; use it
+      cur[part] = opt_object;
+    } else if (cur[part]) {
+      cur = cur[part];
+    } else {
+      cur = cur[part] = {};
+    }
+  }
+};
+
+
+/**
+ * Defines a named value. In uncompiled mode, the value is retrieved from
+ * CLOSURE_DEFINES or CLOSURE_UNCOMPILED_DEFINES if the object is defined and
+ * has the property specified, and otherwise used the defined defaultValue.
+ * When compiled the default can be overridden using the compiler
+ * options or the value set in the CLOSURE_DEFINES object.
+ *
+ * @param {string} name The distinguished name to provide.
+ * @param {string|number|boolean} defaultValue
+ */
+goog.define = function(name, defaultValue) {
+  var value = defaultValue;
+  if (!COMPILED) {
+    if (goog.global.CLOSURE_UNCOMPILED_DEFINES &&
+        Object.prototype.hasOwnProperty.call(
+            goog.global.CLOSURE_UNCOMPILED_DEFINES, name)) {
+      value = goog.global.CLOSURE_UNCOMPILED_DEFINES[name];
+    } else if (goog.global.CLOSURE_DEFINES &&
+        Object.prototype.hasOwnProperty.call(
+            goog.global.CLOSURE_DEFINES, name)) {
+      value = goog.global.CLOSURE_DEFINES[name];
+    }
+  }
+  goog.exportPath_(name, value);
+};
+
+
+/**
+ * @define {boolean} DEBUG is provided as a convenience so that debugging code
+ * that should not be included in a production js_binary can be easily stripped
+ * by specifying --define goog.DEBUG=false to the JSCompiler. For example, most
+ * toString() methods should be declared inside an "if (goog.DEBUG)" conditional
+ * because they are generally used for debugging purposes and it is difficult
+ * for the JSCompiler to statically determine whether they are used.
+ */
+goog.define('goog.DEBUG', true);
+
+
+/**
+ * @define {string} LOCALE defines the locale being used for compilation. It is
+ * used to select locale specific data to be compiled in js binary. BUILD rule
+ * can specify this value by "--define goog.LOCALE=<locale_name>" as JSCompiler
+ * option.
+ *
+ * Take into account that the locale code format is important. You should use
+ * the canonical Unicode format with hyphen as a delimiter. Language must be
+ * lowercase, Language Script - Capitalized, Region - UPPERCASE.
+ * There are few examples: pt-BR, en, en-US, sr-Latin-BO, zh-Hans-CN.
+ *
+ * See more info about locale codes here:
+ * http://www.unicode.org/reports/tr35/#Unicode_Language_and_Locale_Identifiers
+ *
+ * For language codes you should use values defined by ISO 693-1. See it here
+ * http://www.w3.org/WAI/ER/IG/ert/iso639.htm. There is only one exception from
+ * this rule: the Hebrew language. For legacy reasons the old code (iw) should
+ * be used instead of the new code (he), see http://wiki/Main/IIISynonyms.
+ */
+goog.define('goog.LOCALE', 'en');  // default to en
+
+
+/**
+ * @define {boolean} Whether this code is running on trusted sites.
+ *
+ * On untrusted sites, several native functions can be defined or overridden by
+ * external libraries like Prototype, Datejs, and JQuery and setting this flag
+ * to false forces closure to use its own implementations when possible.
+ *
+ * If your JavaScript can be loaded by a third party site and you are wary about
+ * relying on non-standard implementations, specify
+ * "--define goog.TRUSTED_SITE=false" to the JSCompiler.
+ */
+goog.define('goog.TRUSTED_SITE', true);
+
+
+/**
+ * @define {boolean} Whether a project is expected to be running in strict mode.
+ *
+ * This define can be used to trigger alternate implementations compatible with
+ * running in EcmaScript Strict mode or warn about unavailable functionality.
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions_and_function_scope/Strict_mode
+ *
+ */
+goog.define('goog.STRICT_MODE_COMPATIBLE', false);
+
+
+/**
+ * @define {boolean} Whether code that calls {@link goog.setTestOnly} should
+ *     be disallowed in the compilation unit.
+ */
+goog.define('goog.DISALLOW_TEST_ONLY_CODE', COMPILED && !goog.DEBUG);
+
+
+/**
+ * @define {boolean} Whether to use a Chrome app CSP-compliant method for
+ *     loading scripts via goog.require. @see appendScriptSrcNode_.
+ */
+goog.define('goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING', false);
+
+
+/**
+ * Defines a namespace in Closure.
+ *
+ * A namespace may only be defined once in a codebase. It may be defined using
+ * goog.provide() or goog.module().
+ *
+ * The presence of one or more goog.provide() calls in a file indicates
+ * that the file defines the given objects/namespaces.
+ * Provided symbols must not be null or undefined.
+ *
+ * In addition, goog.provide() creates the object stubs for a namespace
+ * (for example, goog.provide("goog.foo.bar") will create the object
+ * goog.foo.bar if it does not already exist).
+ *
+ * Build tools also scan for provide/require/module statements
+ * to discern dependencies, build dependency files (see deps.js), etc.
+ *
+ * @see goog.require
+ * @see goog.module
+ * @param {string} name Namespace provided by this file in the form
+ *     "goog.package.part".
+ */
+goog.provide = function(name) {
+  if (!COMPILED) {
+    // Ensure that the same namespace isn't provided twice.
+    // A goog.module/goog.provide maps a goog.require to a specific file
+    if (goog.isProvided_(name)) {
+      throw Error('Namespace "' + name + '" already declared.');
+    }
+  }
+
+  goog.constructNamespace_(name);
+};
+
+
+/**
+ * @param {string} name Namespace provided by this file in the form
+ *     "goog.package.part".
+ * @param {Object=} opt_obj The object to embed in the namespace.
+ * @private
+ */
+goog.constructNamespace_ = function(name, opt_obj) {
+  if (!COMPILED) {
+    delete goog.implicitNamespaces_[name];
+
+    var namespace = name;
+    while ((namespace = namespace.substring(0, namespace.lastIndexOf('.')))) {
+      if (goog.getObjectByName(namespace)) {
+        break;
+      }
+      goog.implicitNamespaces_[namespace] = true;
+    }
+  }
+
+  goog.exportPath_(name, opt_obj);
+};
+
+
+/**
+ * Module identifier validation regexp.
+ * Note: This is a conservative check, it is very possible to be more lenient,
+ *   the primary exclusion here is "/" and "\" and a leading ".", these
+ *   restrictions are intended to leave the door open for using goog.require
+ *   with relative file paths rather than module identifiers.
+ * @private
+ */
+goog.VALID_MODULE_RE_ = /^[a-zA-Z_$][a-zA-Z0-9._$]*$/;
+
+
+/**
+ * Defines a module in Closure.
+ *
+ * Marks that this file must be loaded as a module and claims the namespace.
+ *
+ * A namespace may only be defined once in a codebase. It may be defined using
+ * goog.provide() or goog.module().
+ *
+ * goog.module() has three requirements:
+ * - goog.module may not be used in the same file as goog.provide.
+ * - goog.module must be the first statement in the file.
+ * - only one goog.module is allowed per file.
+ *
+ * When a goog.module annotated file is loaded, it is enclosed in
+ * a strict function closure. This means that:
+ * - any variables declared in a goog.module file are private to the file
+ * (not global), though the compiler is expected to inline the module.
+ * - The code must obey all the rules of "strict" JavaScript.
+ * - the file will be marked as "use strict"
+ *
+ * NOTE: unlike goog.provide, goog.module does not declare any symbols by
+ * itself. If declared symbols are desired, use
+ * goog.module.declareLegacyNamespace().
+ *
+ *
+ * See the public goog.module proposal: http://goo.gl/Va1hin
+ *
+ * @param {string} name Namespace provided by this file in the form
+ *     "goog.package.part", is expected but not required.
+ */
+goog.module = function(name) {
+  if (!goog.isString(name) ||
+      !name ||
+      name.search(goog.VALID_MODULE_RE_) == -1) {
+    throw Error('Invalid module identifier');
+  }
+  if (!goog.isInModuleLoader_()) {
+    throw Error('Module ' + name + ' has been loaded incorrectly.');
+  }
+  if (goog.moduleLoaderState_.moduleName) {
+    throw Error('goog.module may only be called once per module.');
+  }
+
+  // Store the module name for the loader.
+  goog.moduleLoaderState_.moduleName = name;
+  if (!COMPILED) {
+    // Ensure that the same namespace isn't provided twice.
+    // A goog.module/goog.provide maps a goog.require to a specific file
+    if (goog.isProvided_(name)) {
+      throw Error('Namespace "' + name + '" already declared.');
+    }
+    delete goog.implicitNamespaces_[name];
+  }
+};
+
+
+/**
+ * @param {string} name The module identifier.
+ * @return {?} The module exports for an already loaded module or null.
+ *
+ * Note: This is not an alternative to goog.require, it does not
+ * indicate a hard dependency, instead it is used to indicate
+ * an optional dependency or to access the exports of a module
+ * that has already been loaded.
+ * @suppress {missingProvide}
+ */
+goog.module.get = function(name) {
+  return goog.module.getInternal_(name);
+};
+
+
+/**
+ * @param {string} name The module identifier.
+ * @return {?} The module exports for an already loaded module or null.
+ * @private
+ */
+goog.module.getInternal_ = function(name) {
+  if (!COMPILED) {
+    if (goog.isProvided_(name)) {
+      // goog.require only return a value with-in goog.module files.
+      return name in goog.loadedModules_ ?
+          goog.loadedModules_[name] :
+          goog.getObjectByName(name);
+    } else {
+      return null;
+    }
+  }
+};
+
+
+/**
+ * @private {?{moduleName: (string|undefined)}}
+ */
+goog.moduleLoaderState_ = null;
+
+
+/**
+ * @private
+ * @return {boolean} Whether a goog.module is currently being initialized.
+ */
+goog.isInModuleLoader_ = function() {
+  return goog.moduleLoaderState_ != null;
+};
+
+
+/**
+ * Provide the module's exports as a globally accessible object under the
+ * module's declared name.  This is intended to ease migration to goog.module
+ * for files that have existing usages.
+ * @suppress {missingProvide}
+ */
+goog.module.declareLegacyNamespace = function() {
+  if (!COMPILED && !goog.isInModuleLoader_()) {
+    throw new Error('goog.module.declareLegacyNamespace must be called from ' +
+        'within a goog.module');
+  }
+  if (!COMPILED && !goog.moduleLoaderState_.moduleName) {
+    throw Error('goog.module must be called prior to ' +
+        'goog.module.declareLegacyNamespace.');
+  }
+  goog.moduleLoaderState_.declareLegacyNamespace = true;
+};
+
+
+/**
+ * Marks that the current file should only be used for testing, and never for
+ * live code in production.
+ *
+ * In the case of unit tests, the message may optionally be an exact namespace
+ * for the test (e.g. 'goog.stringTest'). The linter will then ignore the extra
+ * provide (if not explicitly defined in the code).
+ *
+ * @param {string=} opt_message Optional message to add to the error that's
+ *     raised when used in production code.
+ */
+goog.setTestOnly = function(opt_message) {
+  if (goog.DISALLOW_TEST_ONLY_CODE) {
+    opt_message = opt_message || '';
+    throw Error('Importing test-only code into non-debug environment' +
+                (opt_message ? ': ' + opt_message : '.'));
+  }
+};
+
+
+/**
+ * Forward declares a symbol. This is an indication to the compiler that the
+ * symbol may be used in the source yet is not required and may not be provided
+ * in compilation.
+ *
+ * The most common usage of forward declaration is code that takes a type as a
+ * function parameter but does not need to require it. By forward declaring
+ * instead of requiring, no hard dependency is made, and (if not required
+ * elsewhere) the namespace may never be required and thus, not be pulled
+ * into the JavaScript binary. If it is required elsewhere, it will be type
+ * checked as normal.
+ *
+ *
+ * @param {string} name The namespace to forward declare in the form of
+ *     "goog.package.part".
+ */
+goog.forwardDeclare = function(name) {};
+
+
+/**
+ * Forward declare type information. Used to assign types to goog.global
+ * referenced object that would otherwise result in unknown type references
+ * and thus block property disambiguation.
+ */
+goog.forwardDeclare('Document');
+goog.forwardDeclare('XMLHttpRequest');
+
+
+if (!COMPILED) {
+
+  /**
+   * Check if the given name has been goog.provided. This will return false for
+   * names that are available only as implicit namespaces.
+   * @param {string} name name of the object to look for.
+   * @return {boolean} Whether the name has been provided.
+   * @private
+   */
+  goog.isProvided_ = function(name) {
+    return (name in goog.loadedModules_) ||
+        (!goog.implicitNamespaces_[name] &&
+            goog.isDefAndNotNull(goog.getObjectByName(name)));
+  };
+
+  /**
+   * Namespaces implicitly defined by goog.provide. For example,
+   * goog.provide('goog.events.Event') implicitly declares that 'goog' and
+   * 'goog.events' must be namespaces.
+   *
+   * @type {!Object<string, (boolean|undefined)>}
+   * @private
+   */
+  goog.implicitNamespaces_ = {'goog.module': true};
+
+  // NOTE: We add goog.module as an implicit namespace as goog.module is defined
+  // here and because the existing module package has not been moved yet out of
+  // the goog.module namespace. This satisifies both the debug loader and
+  // ahead-of-time dependency management.
+}
+
+
+/**
+ * Returns an object based on its fully qualified external name.  The object
+ * is not found if null or undefined.  If you are using a compilation pass that
+ * renames property names beware that using this function will not find renamed
+ * properties.
+ *
+ * @param {string} name The fully qualified name.
+ * @param {Object=} opt_obj The object within which to look; default is
+ *     |goog.global|.
+ * @return {?} The value (object or primitive) or, if not found, null.
+ */
+goog.getObjectByName = function(name, opt_obj) {
+  var parts = name.split('.');
+  var cur = opt_obj || goog.global;
+  for (var part; part = parts.shift(); ) {
+    if (goog.isDefAndNotNull(cur[part])) {
+      cur = cur[part];
+    } else {
+      return null;
+    }
+  }
+  return cur;
+};
+
+
+/**
+ * Globalizes a whole namespace, such as goog or goog.lang.
+ *
+ * @param {!Object} obj The namespace to globalize.
+ * @param {Object=} opt_global The object to add the properties to.
+ * @deprecated Properties may be explicitly exported to the global scope, but
+ *     this should no longer be done in bulk.
+ */
+goog.globalize = function(obj, opt_global) {
+  var global = opt_global || goog.global;
+  for (var x in obj) {
+    global[x] = obj[x];
+  }
+};
+
+
+/**
+ * Adds a dependency from a file to the files it requires.
+ * @param {string} relPath The path to the js file.
+ * @param {!Array<string>} provides An array of strings with
+ *     the names of the objects this file provides.
+ * @param {!Array<string>} requires An array of strings with
+ *     the names of the objects this file requires.
+ * @param {boolean=} opt_isModule Whether this dependency must be loaded as
+ *     a module as declared by goog.module.
+ */
+goog.addDependency = function(relPath, provides, requires, opt_isModule) {
+  if (goog.DEPENDENCIES_ENABLED) {
+    var provide, require;
+    var path = relPath.replace(/\\/g, '/');
+    var deps = goog.dependencies_;
+    for (var i = 0; provide = provides[i]; i++) {
+      deps.nameToPath[provide] = path;
+      deps.pathIsModule[path] = !!opt_isModule;
+    }
+    for (var j = 0; require = requires[j]; j++) {
+      if (!(path in deps.requires)) {
+        deps.requires[path] = {};
+      }
+      deps.requires[path][require] = true;
+    }
+  }
+};
+
+
+
+
+// NOTE(nnaze): The debug DOM loader was included in base.js as an original way
+// to do "debug-mode" development.  The dependency system can sometimes be
+// confusing, as can the debug DOM loader's asynchronous nature.
+//
+// With the DOM loader, a call to goog.require() is not blocking -- the script
+// will not load until some point after the current script.  If a namespace is
+// needed at runtime, it needs to be defined in a previous script, or loaded via
+// require() with its registered dependencies.
+// User-defined namespaces may need their own deps file.  See http://go/js_deps,
+// http://go/genjsdeps, or, externally, DepsWriter.
+// https://developers.google.com/closure/library/docs/depswriter
+//
+// Because of legacy clients, the DOM loader can't be easily removed from
+// base.js.  Work is being done to make it disableable or replaceable for
+// different environments (DOM-less JavaScript interpreters like Rhino or V8,
+// for example). See bootstrap/ for more information.
+
+
+/**
+ * @define {boolean} Whether to enable the debug loader.
+ *
+ * If enabled, a call to goog.require() will attempt to load the namespace by
+ * appending a script tag to the DOM (if the namespace has been registered).
+ *
+ * If disabled, goog.require() will simply assert that the namespace has been
+ * provided (and depend on the fact that some outside tool correctly ordered
+ * the script).
+ */
+goog.define('goog.ENABLE_DEBUG_LOADER', true);
+
+
+/**
+ * @param {string} msg
+ * @private
+ */
+goog.logToConsole_ = function(msg) {
+  if (goog.global.console) {
+    goog.global.console['error'](msg);
+  }
+};
+
+
+/**
+ * Implements a system for the dynamic resolution of dependencies that works in
+ * parallel with the BUILD system. Note that all calls to goog.require will be
+ * stripped by the JSCompiler when the --process_closure_primitives option is
+ * used.
+ * @see goog.provide
+ * @param {string} name Namespace to include (as was given in goog.provide()) in
+ *     the form "goog.package.part".
+ * @return {?} If called within a goog.module file, the associated namespace or
+ *     module otherwise null.
+ */
+goog.require = function(name) {
+  // If the object already exists we do not need do do anything.
+  if (!COMPILED) {
+    if (goog.ENABLE_DEBUG_LOADER && goog.IS_OLD_IE_) {
+      goog.maybeProcessDeferredDep_(name);
+    }
+
+    if (goog.isProvided_(name)) {
+      if (goog.isInModuleLoader_()) {
+        return goog.module.getInternal_(name);
+      } else {
+        return null;
+      }
+    }
+
+    if (goog.ENABLE_DEBUG_LOADER) {
+      var path = goog.getPathFromDeps_(name);
+      if (path) {
+        goog.writeScripts_(path);
+        return null;
+      }
+    }
+
+    var errorMessage = 'goog.require could not find: ' + name;
+    goog.logToConsole_(errorMessage);
+
+    throw Error(errorMessage);
+  }
+};
+
+
+/**
+ * Path for included scripts.
+ * @type {string}
+ */
+goog.basePath = '';
+
+
+/**
+ * A hook for overriding the base path.
+ * @type {string|undefined}
+ */
+goog.global.CLOSURE_BASE_PATH;
+
+
+/**
+ * Whether to write out Closure's deps file. By default, the deps are written.
+ * @type {boolean|undefined}
+ */
+goog.global.CLOSURE_NO_DEPS;
+
+
+/**
+ * A function to import a single script. This is meant to be overridden when
+ * Closure is being run in non-HTML contexts, such as web workers. It's defined
+ * in the global scope so that it can be set before base.js is loaded, which
+ * allows deps.js to be imported properly.
+ *
+ * The function is passed the script source, which is a relative URI. It should
+ * return true if the script was imported, false otherwise.
+ * @type {(function(string): boolean)|undefined}
+ */
+goog.global.CLOSURE_IMPORT_SCRIPT;
+
+
+/**
+ * Null function used for default values of callbacks, etc.
+ * @return {void} Nothing.
+ */
+goog.nullFunction = function() {};
+
+
+/**
+ * When defining a class Foo with an abstract method bar(), you can do:
+ * Foo.prototype.bar = goog.abstractMethod
+ *
+ * Now if a subclass of Foo fails to override bar(), an error will be thrown
+ * when bar() is invoked.
+ *
+ * Note: This does not take the name of the function to override as an argument
+ * because that would make it more difficult to obfuscate our JavaScript code.
+ *
+ * @type {!Function}
+ * @throws {Error} when invoked to indicate the method should be overridden.
+ */
+goog.abstractMethod = function() {
+  throw Error('unimplemented abstract method');
+};
+
+
+/**
+ * Adds a {@code getInstance} static method that always returns the same
+ * instance object.
+ * @param {!Function} ctor The constructor for the class to add the static
+ *     method to.
+ */
+goog.addSingletonGetter = function(ctor) {
+  ctor.getInstance = function() {
+    if (ctor.instance_) {
+      return ctor.instance_;
+    }
+    if (goog.DEBUG) {
+      // NOTE: JSCompiler can't optimize away Array#push.
+      goog.instantiatedSingletons_[goog.instantiatedSingletons_.length] = ctor;
+    }
+    return ctor.instance_ = new ctor;
+  };
+};
+
+
+/**
+ * All singleton classes that have been instantiated, for testing. Don't read
+ * it directly, use the {@code goog.testing.singleton} module. The compiler
+ * removes this variable if unused.
+ * @type {!Array<!Function>}
+ * @private
+ */
+goog.instantiatedSingletons_ = [];
+
+
+/**
+ * @define {boolean} Whether to load goog.modules using {@code eval} when using
+ * the debug loader.  This provides a better debugging experience as the
+ * source is unmodified and can be edited using Chrome Workspaces or similar.
+ * However in some environments the use of {@code eval} is banned
+ * so we provide an alternative.
+ */
+goog.define('goog.LOAD_MODULE_USING_EVAL', true);
+
+
+/**
+ * @define {boolean} Whether the exports of goog.modules should be sealed when
+ * possible.
+ */
+goog.define('goog.SEAL_MODULE_EXPORTS', goog.DEBUG);
+
+
+/**
+ * The registry of initialized modules:
+ * the module identifier to module exports map.
+ * @private @const {!Object<string, ?>}
+ */
+goog.loadedModules_ = {};
+
+
+/**
+ * True if goog.dependencies_ is available.
+ * @const {boolean}
+ */
+goog.DEPENDENCIES_ENABLED = !COMPILED && goog.ENABLE_DEBUG_LOADER;
+
+
+if (goog.DEPENDENCIES_ENABLED) {
+
+  /**
+   * This object is used to keep track of dependencies and other data that is
+   * used for loading scripts.
+   * @private
+   * @type {{
+   *   pathIsModule: !Object<string, boolean>,
+   *   nameToPath: !Object<string, string>,
+   *   requires: !Object<string, !Object<string, boolean>>,
+   *   visited: !Object<string, boolean>,
+   *   written: !Object<string, boolean>,
+   *   deferred: !Object<string, string>
+   * }}
+   */
+  goog.dependencies_ = {
+    pathIsModule: {}, // 1 to 1
+
+    nameToPath: {}, // 1 to 1
+
+    requires: {}, // 1 to many
+
+    // Used when resolving dependencies to prevent us from visiting file twice.
+    visited: {},
+
+    written: {}, // Used to keep track of script files we have written.
+
+    deferred: {} // Used to track deferred module evaluations in old IEs
+  };
+
+
+  /**
+   * Tries to detect whether is in the context of an HTML document.
+   * @return {boolean} True if it looks like HTML document.
+   * @private
+   */
+  goog.inHtmlDocument_ = function() {
+    /** @type {Document} */
+    var doc = goog.global.document;
+    return typeof doc != 'undefined' &&
+           'write' in doc;  // XULDocument misses write.
+  };
+
+
+  /**
+   * Tries to detect the base path of base.js script that bootstraps Closure.
+   * @private
+   */
+  goog.findBasePath_ = function() {
+    if (goog.isDef(goog.global.CLOSURE_BASE_PATH)) {
+      goog.basePath = goog.global.CLOSURE_BASE_PATH;
+      return;
+    } else if (!goog.inHtmlDocument_()) {
+      return;
+    }
+    /** @type {Document} */
+    var doc = goog.global.document;
+    var scripts = doc.getElementsByTagName('SCRIPT');
+    // Search backwards since the current script is in almost all cases the one
+    // that has base.js.
+    for (var i = scripts.length - 1; i >= 0; --i) {
+      var script = /** @type {!HTMLScriptElement} */ (scripts[i]);
+      var src = script.src;
+      var qmark = src.lastIndexOf('?');
+      var l = qmark == -1 ? src.length : qmark;
+      if (src.substr(l - 7, 7) == 'base.js') {
+        goog.basePath = src.substr(0, l - 7);
+        return;
+      }
+    }
+  };
+
+
+  /**
+   * Imports a script if, and only if, that script hasn't already been imported.
+   * (Must be called at execution time)
+   * @param {string} src Script source.
+   * @param {string=} opt_sourceText The optionally source text to evaluate
+   * @private
+   */
+  goog.importScript_ = function(src, opt_sourceText) {
+    var importScript = goog.global.CLOSURE_IMPORT_SCRIPT ||
+        goog.writeScriptTag_;
+    if (importScript(src, opt_sourceText)) {
+      goog.dependencies_.written[src] = true;
+    }
+  };
+
+
+  /** @const @private {boolean} */
+  goog.IS_OLD_IE_ = !!(!goog.global.atob && goog.global.document &&
+      goog.global.document.all);
+
+
+  /**
+   * Given a URL initiate retrieval and execution of the module.
+   * @param {string} src Script source URL.
+   * @private
+   */
+  goog.importModule_ = function(src) {
+    // In an attempt to keep browsers from timing out loading scripts using
+    // synchronous XHRs, put each load in its own script block.
+    var bootstrap = 'goog.retrieveAndExecModule_("' + src + '");';
+
+    if (goog.importScript_('', bootstrap)) {
+      goog.dependencies_.written[src] = true;
+    }
+  };
+
+
+  /** @private {!Array<string>} */
+  goog.queuedModules_ = [];
+
+
+  /**
+   * Return an appropriate module text. Suitable to insert into
+   * a script tag (that is unescaped).
+   * @param {string} srcUrl
+   * @param {string} scriptText
+   * @return {string}
+   * @private
+   */
+  goog.wrapModule_ = function(srcUrl, scriptText) {
+    if (!goog.LOAD_MODULE_USING_EVAL || !goog.isDef(goog.global.JSON)) {
+      return '' +
+          'goog.loadModule(function(exports) {' +
+          '"use strict";' +
+          scriptText +
+          '\n' + // terminate any trailing single line comment.
+          ';return exports' +
+          '});' +
+          '\n//# sourceURL=' + srcUrl + '\n';
+    } else {
+      return '' +
+          'goog.loadModule(' +
+          goog.global.JSON.stringify(
+              scriptText + '\n//# sourceURL=' + srcUrl + '\n') +
+          ');';
+    }
+  };
+
+  // On IE9 and earlier, it is necessary to handle
+  // deferred module loads. In later browsers, the
+  // code to be evaluated is simply inserted as a script
+  // block in the correct order. To eval deferred
+  // code at the right time, we piggy back on goog.require to call
+  // goog.maybeProcessDeferredDep_.
+  //
+  // The goog.requires are used both to bootstrap
+  // the loading process (when no deps are available) and
+  // declare that they should be available.
+  //
+  // Here we eval the sources, if all the deps are available
+  // either already eval'd or goog.require'd.  This will
+  // be the case when all the dependencies have already
+  // been loaded, and the dependent module is loaded.
+  //
+  // But this alone isn't sufficient because it is also
+  // necessary to handle the case where there is no root
+  // that is not deferred.  For that there we register for an event
+  // and trigger goog.loadQueuedModules_ handle any remaining deferred
+  // evaluations.
+
+  /**
+   * Handle any remaining deferred goog.module evals.
+   * @private
+   */
+  goog.loadQueuedModules_ = function() {
+    var count = goog.queuedModules_.length;
+    if (count > 0) {
+      var queue = goog.queuedModules_;
+      goog.queuedModules_ = [];
+      for (var i = 0; i < count; i++) {
+        var path = queue[i];
+        goog.maybeProcessDeferredPath_(path);
+      }
+    }
+  };
+
+
+  /**
+   * Eval the named module if its dependencies are
+   * available.
+   * @param {string} name The module to load.
+   * @private
+   */
+  goog.maybeProcessDeferredDep_ = function(name) {
+    if (goog.isDeferredModule_(name) &&
+        goog.allDepsAreAvailable_(name)) {
+      var path = goog.getPathFromDeps_(name);
+      goog.maybeProcessDeferredPath_(goog.basePath + path);
+    }
+  };
+
+  /**
+   * @param {string} name The module to check.
+   * @return {boolean} Whether the name represents a
+   *     module whose evaluation has been deferred.
+   * @private
+   */
+  goog.isDeferredModule_ = function(name) {
+    var path = goog.getPathFromDeps_(name);
+    if (path && goog.dependencies_.pathIsModule[path]) {
+      var abspath = goog.basePath + path;
+      return (abspath) in goog.dependencies_.deferred;
+    }
+    return false;
+  };
+
+  /**
+   * @param {string} name The module to check.
+   * @return {boolean} Whether the name represents a
+   *     module whose declared dependencies have all been loaded
+   *     (eval'd or a deferred module load)
+   * @private
+   */
+  goog.allDepsAreAvailable_ = function(name) {
+    var path = goog.getPathFromDeps_(name);
+    if (path && (path in goog.dependencies_.requires)) {
+      for (var requireName in goog.dependencies_.requires[path]) {
+        if (!goog.isProvided_(requireName) &&
+            !goog.isDeferredModule_(requireName)) {
+          return false;
+        }
+      }
+    }
+    return true;
+  };
+
+
+  /**
+   * @param {string} abspath
+   * @private
+   */
+  goog.maybeProcessDeferredPath_ = function(abspath) {
+    if (abspath in goog.dependencies_.deferred) {
+      var src = goog.dependencies_.deferred[abspath];
+      delete goog.dependencies_.deferred[abspath];
+      goog.globalEval(src);
+    }
+  };
+
+
+  /**
+   * @param {function(?):?|string} moduleDef The module definition.
+   */
+  goog.loadModule = function(moduleDef) {
+    // NOTE: we allow function definitions to be either in the from
+    // of a string to eval (which keeps the original source intact) or
+    // in a eval forbidden environment (CSP) we allow a function definition
+    // which in its body must call {@code goog.module}, and return the exports
+    // of the module.
+    var previousState = goog.moduleLoaderState_;
+    try {
+      goog.moduleLoaderState_ = {moduleName: undefined};
+      var exports;
+      if (goog.isFunction(moduleDef)) {
+        exports = moduleDef.call(goog.global, {});
+      } else if (goog.isString(moduleDef)) {
+        exports = goog.loadModuleFromSource_.call(goog.global, moduleDef);
+      } else {
+        throw Error('Invalid module definition');
+      }
+
+      var moduleName = goog.moduleLoaderState_.moduleName;
+      if (!goog.isString(moduleName) || !moduleName) {
+        throw Error('Invalid module name \"' + moduleName + '\"');
+      }
+
+      // Don't seal legacy namespaces as they may be uses as a parent of
+      // another namespace
+      if (goog.moduleLoaderState_.declareLegacyNamespace) {
+        goog.constructNamespace_(moduleName, exports);
+      } else if (goog.SEAL_MODULE_EXPORTS && Object.seal) {
+        Object.seal(exports);
+      }
+
+      goog.loadedModules_[moduleName] = exports;
+    } finally {
+      goog.moduleLoaderState_ = previousState;
+    }
+  };
+
+
+  /**
+   * @private @const {function(string):?}
+   * @suppress {newCheckTypes}
+   */
+  goog.loadModuleFromSource_ = function() {
+    // NOTE: we avoid declaring parameters or local variables here to avoid
+    // masking globals or leaking values into the module definition.
+    'use strict';
+    var exports = {};
+    eval(arguments[0]);
+    return exports;
+  };
+
+
+  /**
+   * Writes a new script pointing to {@code src} directly into the DOM.
+   *
+   * NOTE: This method is not CSP-compliant. @see goog.appendScriptSrcNode_ for
+   * the fallback mechanism.
+   *
+   * @param {string} src The script URL.
+   * @private
+   */
+  goog.writeScriptSrcNode_ = function(src) {
+    goog.global.document.write(
+        '<script type="text/javascript" src="' + src + '"></' + 'script>');
+  };
+
+
+  /**
+   * Appends a new script node to the DOM using a CSP-compliant mechanism. This
+   * method exists as a fallback for document.write (which is not allowed in a
+   * strict CSP context, e.g., Chrome apps).
+   *
+   * NOTE: This method is not analogous to using document.write to insert a
+   * <script> tag; specifically, the user agent will execute a script added by
+   * document.write immediately after the current script block finishes
+   * executing, whereas the DOM-appended script node will not be executed until
+   * the entire document is parsed and executed. That is to say, this script is
+   * added to the end of the script execution queue.
+   *
+   * The page must not attempt to call goog.required entities until after the
+   * document has loaded, e.g., in or after the window.onload callback.
+   *
+   * @param {string} src The script URL.
+   * @private
+   */
+  goog.appendScriptSrcNode_ = function(src) {
+    /** @type {Document} */
+    var doc = goog.global.document;
+    var scriptEl = doc.createElement('script');
+    scriptEl.type = 'text/javascript';
+    scriptEl.src = src;
+    scriptEl.defer = false;
+    scriptEl.async = false;
+    doc.head.appendChild(scriptEl);
+  };
+
+
+  /**
+   * The default implementation of the import function. Writes a script tag to
+   * import the script.
+   *
+   * @param {string} src The script url.
+   * @param {string=} opt_sourceText The optionally source text to evaluate
+   * @return {boolean} True if the script was imported, false otherwise.
+   * @private
+   */
+  goog.writeScriptTag_ = function(src, opt_sourceText) {
+    if (goog.inHtmlDocument_()) {
+      /** @type {Document} */
+      var doc = goog.global.document;
+
+      // If the user tries to require a new symbol after document load,
+      // something has gone terribly wrong. Doing a document.write would
+      // wipe out the page. This does not apply to the CSP-compliant method
+      // of writing script tags.
+      if (!goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING &&
+          doc.readyState == 'complete') {
+        // Certain test frameworks load base.js multiple times, which tries
+        // to write deps.js each time. If that happens, just fail silently.
+        // These frameworks wipe the page between each load of base.js, so this
+        // is OK.
+        var isDeps = /\bdeps.js$/.test(src);
+        if (isDeps) {
+          return false;
+        } else {
+          throw Error('Cannot write "' + src + '" after document load');
+        }
+      }
+
+      var isOldIE = goog.IS_OLD_IE_;
+
+      if (opt_sourceText === undefined) {
+        if (!isOldIE) {
+          if (goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING) {
+            goog.appendScriptSrcNode_(src);
+          } else {
+            goog.writeScriptSrcNode_(src);
+          }
+        } else {
+          var state = " onreadystatechange='goog.onScriptLoad_(this, " +
+              ++goog.lastNonModuleScriptIndex_ + ")' ";
+          doc.write(
+              '<script type="text/javascript" src="' +
+                  src + '"' + state + '></' + 'script>');
+        }
+      } else {
+        doc.write(
+            '<script type="text/javascript">' +
+            opt_sourceText +
+            '</' + 'script>');
+      }
+      return true;
+    } else {
+      return false;
+    }
+  };
+
+
+  /** @private {number} */
+  goog.lastNonModuleScriptIndex_ = 0;
+
+
+  /**
+   * A readystatechange handler for legacy IE
+   * @param {!HTMLScriptElement} script
+   * @param {number} scriptIndex
+   * @return {boolean}
+   * @private
+   */
+  goog.onScriptLoad_ = function(script, scriptIndex) {
+    // for now load the modules when we reach the last script,
+    // later allow more inter-mingling.
+    if (script.readyState == 'complete' &&
+        goog.lastNonModuleScriptIndex_ == scriptIndex) {
+      goog.loadQueuedModules_();
+    }
+    return true;
+  };
+
+  /**
+   * Resolves dependencies based on the dependencies added using addDependency
+   * and calls importScript_ in the correct order.
+   * @param {string} pathToLoad The path from which to start discovering
+   *     dependencies.
+   * @private
+   */
+  goog.writeScripts_ = function(pathToLoad) {
+    /** @type {!Array<string>} The scripts we need to write this time. */
+    var scripts = [];
+    var seenScript = {};
+    var deps = goog.dependencies_;
+
+    /** @param {string} path */
+    function visitNode(path) {
+      if (path in deps.written) {
+        return;
+      }
+
+      // We have already visited this one. We can get here if we have cyclic
+      // dependencies.
+      if (path in deps.visited) {
+        return;
+      }
+
+      deps.visited[path] = true;
+
+      if (path in deps.requires) {
+        for (var requireName in deps.requires[path]) {
+          // If the required name is defined, we assume that it was already
+          // bootstrapped by other means.
+          if (!goog.isProvided_(requireName)) {
+            if (requireName in deps.nameToPath) {
+              visitNode(deps.nameToPath[requireName]);
+            } else {
+              throw Error('Undefined nameToPath for ' + requireName);
+            }
+          }
+        }
+      }
+
+      if (!(path in seenScript)) {
+        seenScript[path] = true;
+        scripts.push(path);
+      }
+    }
+
+    visitNode(pathToLoad);
+
+    // record that we are going to load all these scripts.
+    for (var i = 0; i < scripts.length; i++) {
+      var path = scripts[i];
+      goog.dependencies_.written[path] = true;
+    }
+
+    // If a module is loaded synchronously then we need to
+    // clear the current inModuleLoader value, and restore it when we are
+    // done loading the current "requires".
+    var moduleState = goog.moduleLoaderState_;
+    goog.moduleLoaderState_ = null;
+
+    for (var i = 0; i < scripts.length; i++) {
+      var path = scripts[i];
+      if (path) {
+        if (!deps.pathIsModule[path]) {
+          goog.importScript_(goog.basePath + path);
+        } else {
+          goog.importModule_(goog.basePath + path);
+        }
+      } else {
+        goog.moduleLoaderState_ = moduleState;
+        throw Error('Undefined script input');
+      }
+    }
+
+    // restore the current "module loading state"
+    goog.moduleLoaderState_ = moduleState;
+  };
+
+
+  /**
+   * Looks at the dependency rules and tries to determine the script file that
+   * fulfills a particular rule.
+   * @param {string} rule In the form goog.namespace.Class or project.script.
+   * @return {?string} Url corresponding to the rule, or null.
+   * @private
+   */
+  goog.getPathFromDeps_ = function(rule) {
+    if (rule in goog.dependencies_.nameToPath) {
+      return goog.dependencies_.nameToPath[rule];
+    } else {
+      return null;
+    }
+  };
+
+  goog.findBasePath_();
+
+  // Allow projects to manage the deps files themselves.
+  if (!goog.global.CLOSURE_NO_DEPS) {
+    goog.importScript_(goog.basePath + 'deps.js');
+  }
+}
+
+
+/**
+ * Normalize a file path by removing redundant ".." and extraneous "." file
+ * path components.
+ * @param {string} path
+ * @return {string}
+ * @private
+ */
+goog.normalizePath_ = function(path) {
+  var components = path.split('/');
+  var i = 0;
+  while (i < components.length) {
+    if (components[i] == '.') {
+      components.splice(i, 1);
+    } else if (i && components[i] == '..' &&
+        components[i - 1] && components[i - 1] != '..') {
+      components.splice(--i, 2);
+    } else {
+      i++;
+    }
+  }
+  return components.join('/');
+};
+
+
+/**
+ * Loads file by synchronous XHR. Should not be used in production environments.
+ * @param {string} src Source URL.
+ * @return {string} File contents.
+ * @private
+ */
+goog.loadFileSync_ = function(src) {
+  if (goog.global.CLOSURE_LOAD_FILE_SYNC) {
+    return goog.global.CLOSURE_LOAD_FILE_SYNC(src);
+  } else {
+    /** @type {XMLHttpRequest} */
+    var xhr = new goog.global['XMLHttpRequest']();
+    xhr.open('get', src, false);
+    xhr.send();
+    return xhr.responseText;
+  }
+};
+
+
+/**
+ * Retrieve and execute a module.
+ * @param {string} src Script source URL.
+ * @private
+ */
+goog.retrieveAndExecModule_ = function(src) {
+  if (!COMPILED) {
+    // The full but non-canonicalized URL for later use.
+    var originalPath = src;
+    // Canonicalize the path, removing any /./ or /../ since Chrome's debugging
+    // console doesn't auto-canonicalize XHR loads as it does <script> srcs.
+    src = goog.normalizePath_(src);
+
+    var importScript = goog.global.CLOSURE_IMPORT_SCRIPT ||
+        goog.writeScriptTag_;
+
+    var scriptText = goog.loadFileSync_(src);
+
+    if (scriptText != null) {
+      var execModuleScript = goog.wrapModule_(src, scriptText);
+      var isOldIE = goog.IS_OLD_IE_;
+      if (isOldIE) {
+        goog.dependencies_.deferred[originalPath] = execModuleScript;
+        goog.queuedModules_.push(originalPath);
+      } else {
+        importScript(src, execModuleScript);
+      }
+    } else {
+      throw new Error('load of ' + src + 'failed');
+    }
+  }
+};
+
+
+//==============================================================================
+// Language Enhancements
+//==============================================================================
+
+
+/**
+ * This is a "fixed" version of the typeof operator.  It differs from the typeof
+ * operator in such a way that null returns 'null' and arrays return 'array'.
+ * @param {*} value The value to get the type of.
+ * @return {string} The name of the type.
+ */
+goog.typeOf = function(value) {
+  var s = typeof value;
+  if (s == 'object') {
+    if (value) {
+      // Check these first, so we can avoid calling Object.prototype.toString if
+      // possible.
+      //
+      // IE improperly marshals tyepof across execution contexts, but a
+      // cross-context object will still return false for "instanceof Object".
+      if (value instanceof Array) {
+        return 'array';
+      } else if (value instanceof Object) {
+        return s;
+      }
+
+      // HACK: In order to use an Object prototype method on the arbitrary
+      //   value, the compiler requires the value be cast to type Object,
+      //   even though the ECMA spec explicitly allows it.
+      var className = Object.prototype.toString.call(
+          /** @type {Object} */ (value));
+      // In Firefox 3.6, attempting to access iframe window objects' length
+      // property throws an NS_ERROR_FAILURE, so we need to special-case it
+      // here.
+      if (className == '[object Window]') {
+        return 'object';
+      }
+
+      // We cannot always use constructor == Array or instanceof Array because
+      // different frames have different Array objects. In IE6, if the iframe
+      // where the array was created is destroyed, the array loses its
+      // prototype. Then dereferencing val.splice here throws an exception, so
+      // we can't use goog.isFunction. Calling typeof directly returns 'unknown'
+      // so that will work. In this case, this function will return false and
+      // most array functions will still work because the array is still
+      // array-like (supports length and []) even though it has lost its
+      // prototype.
+      // Mark Miller noticed that Object.prototype.toString
+      // allows access to the unforgeable [[Class]] property.
+      //  15.2.4.2 Object.prototype.toString ( )
+      //  When the toString method is called, the following steps are taken:
+      //      1. Get the [[Class]] property of this object.
+      //      2. Compute a string value by concatenating the three strings
+      //         "[object ", Result(1), and "]".
+      //      3. Return Result(2).
+      // and this behavior survives the destruction of the execution context.
+      if ((className == '[object Array]' ||
+           // In IE all non value types are wrapped as objects across window
+           // boundaries (not iframe though) so we have to do object detection
+           // for this edge case.
+           typeof value.length == 'number' &&
+           typeof value.splice != 'undefined' &&
+           typeof value.propertyIsEnumerable != 'undefined' &&
+           !value.propertyIsEnumerable('splice')
+
+          )) {
+        return 'array';
+      }
+      // HACK: There is still an array case that fails.
+      //     function ArrayImpostor() {}
+      //     ArrayImpostor.prototype = [];
+      //     var impostor = new ArrayImpostor;
+      // this can be fixed by getting rid of the fast path
+      // (value instanceof Array) and solely relying on
+      // (value && Object.prototype.toString.vall(value) === '[object Array]')
+      // but that would require many more function calls and is not warranted
+      // unless closure code is receiving objects from untrusted sources.
+
+      // IE in cross-window calls does not correctly marshal the function type
+      // (it appears just as an object) so we cannot use just typeof val ==
+      // 'function'. However, if the object has a call property, it is a
+      // function.
+      if ((className == '[object Function]' ||
+          typeof value.call != 'undefined' &&
+          typeof value.propertyIsEnumerable != 'undefined' &&
+          !value.propertyIsEnumerable('call'))) {
+        return 'function';
+      }
+
+    } else {
+      return 'null';
+    }
+
+  } else if (s == 'function' && typeof value.call == 'undefined') {
+    // In Safari typeof nodeList returns 'function', and on Firefox typeof
+    // behaves similarly for HTML{Applet,Embed,Object}, Elements and RegExps. We
+    // would like to return object for those and we can detect an invalid
+    // function by making sure that the function object has a call method.
+    return 'object';
+  }
+  return s;
+};
+
+
+/**
+ * Returns true if the specified value is null.
+ * @param {?} val Variable to test.
+ * @return {boolean} Whether variable is null.
+ */
+goog.isNull = function(val) {
+  return val === null;
+};
+
+
+/**
+ * Returns true if the specified value is defined and not null.
+ * @param {?} val Variable to test.
+ * @return {boolean} Whether variable is defined and not null.
+ */
+goog.isDefAndNotNull = function(val) {
+  // Note that undefined == null.
+  return val != null;
+};
+
+
+/**
+ * Returns true if the specified value is an array.
+ * @param {?} val Variable to test.
+ * @return {boolean} Whether variable is an array.
+ */
+goog.isArray = function(val) {
+  return goog.typeOf(val) == 'array';
+};
+
+
+/**
+ * Returns true if the object looks like an array. To qualify as array like
+ * the value needs to be either a NodeList or an object with a Number length
+ * property. As a special case, a function value is not array like, because its
+ * length property is fixed to correspond to the number of expected arguments.
+ * @param {?} val Variable to test.
+ * @return {boolean} Whether variable is an array.
+ */
+goog.isArrayLike = function(val) {
+  var type = goog.typeOf(val);
+  // We do not use goog.isObject here in order to exclude function values.
+  return type == 'array' || type == 'object' && typeof val.length == 'number';
+};
+
+
+/**
+ * Returns true if the object looks like a Date. To qualify as Date-like the
+ * value needs to be an object and have a getFullYear() function.
+ * @param {?} val Variable to test.
+ * @return {boolean} Whether variable is a like a Date.
+ */
+goog.isDateLike = function(val) {
+  return goog.isObject(val) && typeof val.getFullYear == 'function';
+};
+
+
+/**
+ * Returns true if the specified value is a string.
+ * @param {?} val Variable to test.
+ * @return {boolean} Whether variable is a string.
+ */
+goog.isString = function(val) {
+  return typeof val == 'string';
+};
+
+
+/**
+ * Returns true if the specified value is a boolean.
+ * @param {?} val Variable to test.
+ * @return {boolean} Whether variable is boolean.
+ */
+goog.isBoolean = function(val) {
+  return typeof val == 'boolean';
+};
+
+
+/**
+ * Returns true if the specified value is a number.
+ * @param {?} val Variable to test.
+ * @return {boolean} Whether variable is a number.
+ */
+goog.isNumber = function(val) {
+  return typeof val == 'number';
+};
+
+
+/**
+ * Returns true if the specified value is a function.
+ * @param {?} val Variable to test.
+ * @return {boolean} Whether variable is a function.
+ */
+goog.isFunction = function(val) {
+  return goog.typeOf(val) == 'function';
+};
+
+
+/**
+ * Returns true if the specified value is an object.  This includes arrays and
+ * functions.
+ * @param {?} val Variable to test.
+ * @return {boolean} Whether variable is an object.
+ */
+goog.isObject = function(val) {
+  var type = typeof val;
+  return type == 'object' && val != null || type == 'function';
+  // return Object(val) === val also works, but is slower, especially if val is
+  // not an object.
+};
+
+
+/**
+ * Gets a unique ID for an object. This mutates the object so that further calls
+ * with the same object as a parameter returns the same value. The unique ID is
+ * guaranteed to be unique across the current session amongst objects that are
+ * passed into {@code getUid}. There is no guarantee that the ID is unique or
+ * consistent across sessions. It is unsafe to generate unique ID for function
+ * prototypes.
+ *
+ * @param {Object} obj The object to get the unique ID for.
+ * @return {number} The unique ID for the object.
+ */
+goog.getUid = function(obj) {
+  // TODO(arv): Make the type stricter, do not accept null.
+
+  // In Opera window.hasOwnProperty exists but always returns false so we avoid
+  // using it. As a consequence the unique ID generated for BaseClass.prototype
+  // and SubClass.prototype will be the same.
+  return obj[goog.UID_PROPERTY_] ||
+      (obj[goog.UID_PROPERTY_] = ++goog.uidCounter_);
+};
+
+
+/**
+ * Whether the given object is already assigned a unique ID.
+ *
+ * This does not modify the object.
+ *
+ * @param {!Object} obj The object to check.
+ * @return {boolean} Whether there is an assigned unique id for the object.
+ */
+goog.hasUid = function(obj) {
+  return !!obj[goog.UID_PROPERTY_];
+};
+
+
+/**
+ * Removes the unique ID from an object. This is useful if the object was
+ * previously mutated using {@code goog.getUid} in which case the mutation is
+ * undone.
+ * @param {Object} obj The object to remove the unique ID field from.
+ */
+goog.removeUid = function(obj) {
+  // TODO(arv): Make the type stricter, do not accept null.
+
+  // In IE, DOM nodes are not instances of Object and throw an exception if we
+  // try to delete.  Instead we try to use removeAttribute.
+  if ('removeAttribute' in obj) {
+    obj.removeAttribute(goog.UID_PROPERTY_);
+  }
+  /** @preserveTry */
+  try {
+    delete obj[goog.UID_PROPERTY_];
+  } catch (ex) {
+  }
+};
+
+
+/**
+ * Name for unique ID property. Initialized in a way to help avoid collisions
+ * with other closure JavaScript on the same page.
+ * @type {string}
+ * @private
+ */
+goog.UID_PROPERTY_ = 'closure_uid_' + ((Math.random() * 1e9) >>> 0);
+
+
+/**
+ * Counter for UID.
+ * @type {number}
+ * @private
+ */
+goog.uidCounter_ = 0;
+
+
+/**
+ * Adds a hash code field to an object. The hash code is unique for the
+ * given object.
+ * @param {Object} obj The object to get the hash code for.
+ * @return {number} The hash code for the object.
+ * @deprecated Use goog.getUid instead.
+ */
+goog.getHashCode = goog.getUid;
+
+
+/**
+ * Removes the hash code field from an object.
+ * @param {Object} obj The object to remove the field from.
+ * @deprecated Use goog.removeUid instead.
+ */
+goog.removeHashCode = goog.removeUid;
+
+
+/**
+ * Clones a value. The input may be an Object, Array, or basic type. Objects and
+ * arrays will be cloned recursively.
+ *
+ * WARNINGS:
+ * <code>goog.cloneObject</code> does not detect reference loops. Objects that
+ * refer to themselves will cause infinite recursion.
+ *
+ * <code>goog.cloneObject</code> is unaware of unique identifiers, and copies
+ * UIDs created by <code>getUid</code> into cloned results.
+ *
+ * @param {*} obj The value to clone.
+ * @return {*} A clone of the input value.
+ * @deprecated goog.cloneObject is unsafe. Prefer the goog.object methods.
+ */
+goog.cloneObject = function(obj) {
+  var type = goog.typeOf(obj);
+  if (type == 'object' || type == 'array') {
+    if (obj.clone) {
+      return obj.clone();
+    }
+    var clone = type == 'array' ? [] : {};
+    for (var key in obj) {
+      clone[key] = goog.cloneObject(obj[key]);
+    }
+    return clone;
+  }
+
+  return obj;
+};
+
+
+/**
+ * A native implementation of goog.bind.
+ * @param {Function} fn A function to partially apply.
+ * @param {Object|undefined} selfObj Specifies the object which this should
+ *     point to when the function is run.
+ * @param {...*} var_args Additional arguments that are partially applied to the
+ *     function.
+ * @return {!Function} A partially-applied form of the function bind() was
+ *     invoked as a method of.
+ * @private
+ * @suppress {deprecated} The compiler thinks that Function.prototype.bind is
+ *     deprecated because some people have declared a pure-JS version.
+ *     Only the pure-JS version is truly deprecated.
+ */
+goog.bindNative_ = function(fn, selfObj, var_args) {
+  return /** @type {!Function} */ (fn.call.apply(fn.bind, arguments));
+};
+
+
+/**
+ * A pure-JS implementation of goog.bind.
+ * @param {Function} fn A function to partially apply.
+ * @param {Object|undefined} selfObj Specifies the object which this should
+ *     point to when the function is run.
+ * @param {...*} var_args Additional arguments that are partially applied to the
+ *     function.
+ * @return {!Function} A partially-applied form of the function bind() was
+ *     invoked as a method of.
+ * @private
+ */
+goog.bindJs_ = function(fn, selfObj, var_args) {
+  if (!fn) {
+    throw new Error();
+  }
+
+  if (arguments.length > 2) {
+    var boundArgs = Array.prototype.slice.call(arguments, 2);
+    return function() {
+      // Prepend the bound arguments to the current arguments.
+      var newArgs = Array.prototype.slice.call(arguments);
+      Array.prototype.unshift.apply(newArgs, boundArgs);
+      return fn.apply(selfObj, newArgs);
+    };
+
+  } else {
+    return function() {
+      return fn.apply(selfObj, arguments);
+    };
+  }
+};
+
+
+/**
+ * Partially applies this function to a particular 'this object' and zero or
+ * more arguments. The result is a new function with some arguments of the first
+ * function pre-filled and the value of this 'pre-specified'.
+ *
+ * Remaining arguments specified at call-time are appended to the pre-specified
+ * ones.
+ *
+ * Also see: {@link #partial}.
+ *
+ * Usage:
+ * <pre>var barMethBound = goog.bind(myFunction, myObj, 'arg1', 'arg2');
+ * barMethBound('arg3', 'arg4');</pre>
+ *
+ * @param {?function(this:T, ...)} fn A function to partially apply.
+ * @param {T} selfObj Specifies the object which this should point to when the
+ *     function is run.
+ * @param {...*} var_args Additional arguments that are partially applied to the
+ *     function.
+ * @return {!Function} A partially-applied form of the function goog.bind() was
+ *     invoked as a method of.
+ * @template T
+ * @suppress {deprecated} See above.
+ */
+goog.bind = function(fn, selfObj, var_args) {
+  // TODO(nicksantos): narrow the type signature.
+  if (Function.prototype.bind &&
+      // NOTE(nicksantos): Somebody pulled base.js into the default Chrome
+      // extension environment. This means that for Chrome extensions, they get
+      // the implementation of Function.prototype.bind that calls goog.bind
+      // instead of the native one. Even worse, we don't want to introduce a
+      // circular dependency between goog.bind and Function.prototype.bind, so
+      // we have to hack this to make sure it works correctly.
+      Function.prototype.bind.toString().indexOf('native code') != -1) {
+    goog.bind = goog.bindNative_;
+  } else {
+    goog.bind = goog.bindJs_;
+  }
+  return goog.bind.apply(null, arguments);
+};
+
+
+/**
+ * Like goog.bind(), except that a 'this object' is not required. Useful when
+ * the target function is already bound.
+ *
+ * Usage:
+ * var g = goog.partial(f, arg1, arg2);
+ * g(arg3, arg4);
+ *
+ * @param {Function} fn A function to partially apply.
+ * @param {...*} var_args Additional arguments that are partially applied to fn.
+ * @return {!Function} A partially-applied form of the function goog.partial()
+ *     was invoked as a method of.
+ */
+goog.partial = function(fn, var_args) {
+  var args = Array.prototype.slice.call(arguments, 1);
+  return function() {
+    // Clone the array (with slice()) and append additional arguments
+    // to the existing arguments.
+    var newArgs = args.slice();
+    newArgs.push.apply(newArgs, arguments);
+    return fn.apply(this, newArgs);
+  };
+};
+
+
+/**
+ * Copies all the members of a source object to a target object. This method
+ * does not work on all browsers for all objects that contain keys such as
+ * toString or hasOwnProperty. Use goog.object.extend for this purpose.
+ * @param {Object} target Target.
+ * @param {Object} source Source.
+ */
+goog.mixin = function(target, source) {
+  for (var x in source) {
+    target[x] = source[x];
+  }
+
+  // For IE7 or lower, the for-in-loop does not contain any properties that are
+  // not enumerable on the prototype object (for example, isPrototypeOf from
+  // Object.prototype) but also it will not include 'replace' on objects that
+  // extend String and change 'replace' (not that it is common for anyone to
+  // extend anything except Object).
+};
+
+
+/**
+ * @return {number} An integer value representing the number of milliseconds
+ *     between midnight, January 1, 1970 and the current time.
+ */
+goog.now = (goog.TRUSTED_SITE && Date.now) || (function() {
+  // Unary plus operator converts its operand to a number which in the case of
+  // a date is done by calling getTime().
+  return +new Date();
+});
+
+
+/**
+ * Evals JavaScript in the global scope.  In IE this uses execScript, other
+ * browsers use goog.global.eval. If goog.global.eval does not evaluate in the
+ * global scope (for example, in Safari), appends a script tag instead.
+ * Throws an exception if neither execScript or eval is defined.
+ * @param {string} script JavaScript string.
+ */
+goog.globalEval = function(script) {
+  if (goog.global.execScript) {
+    goog.global.execScript(script, 'JavaScript');
+  } else if (goog.global.eval) {
+    // Test to see if eval works
+    if (goog.evalWorksForGlobals_ == null) {
+      goog.global.eval('var _evalTest_ = 1;');
+      if (typeof goog.global['_evalTest_'] != 'undefined') {
+        try {
+          delete goog.global['_evalTest_'];
+        } catch (ignore) {
+          // Microsoft edge fails the deletion above in strict mode.
+        }
+        goog.evalWorksForGlobals_ = true;
+      } else {
+        goog.evalWorksForGlobals_ = false;
+      }
+    }
+
+    if (goog.evalWorksForGlobals_) {
+      goog.global.eval(script);
+    } else {
+      /** @type {Document} */
+      var doc = goog.global.document;
+      var scriptElt = doc.createElement('SCRIPT');
+      scriptElt.type = 'text/javascript';
+      scriptElt.defer = false;
+      // Note(user): can't use .innerHTML since "t('<test>')" will fail and
+      // .text doesn't work in Safari 2.  Therefore we append a text node.
+      scriptElt.appendChild(doc.createTextNode(script));
+      doc.body.appendChild(scriptElt);
+      doc.body.removeChild(scriptElt);
+    }
+  } else {
+    throw Error('goog.globalEval not available');
+  }
+};
+
+
+/**
+ * Indicates whether or not we can call 'eval' directly to eval code in the
+ * global scope. Set to a Boolean by the first call to goog.globalEval (which
+ * empirically tests whether eval works for globals). @see goog.globalEval
+ * @type {?boolean}
+ * @private
+ */
+goog.evalWorksForGlobals_ = null;
+
+
+/**
+ * Optional map of CSS class names to obfuscated names used with
+ * goog.getCssName().
+ * @private {!Object<string, string>|undefined}
+ * @see goog.setCssNameMapping
+ */
+goog.cssNameMapping_;
+
+
+/**
+ * Optional obfuscation style for CSS class names. Should be set to either
+ * 'BY_WHOLE' or 'BY_PART' if defined.
+ * @type {string|undefined}
+ * @private
+ * @see goog.setCssNameMapping
+ */
+goog.cssNameMappingStyle_;
+
+
+/**
+ * Handles strings that are intended to be used as CSS class names.
+ *
+ * This function works in tandem with @see goog.setCssNameMapping.
+ *
+ * Without any mapping set, the arguments are simple joined with a hyphen and
+ * passed through unaltered.
+ *
+ * When there is a mapping, there are two possible styles in which these
+ * mappings are used. In the BY_PART style, each part (i.e. in between hyphens)
+ * of the passed in css name is rewritten according to the map. In the BY_WHOLE
+ * style, the full css name is looked up in the map directly. If a rewrite is
+ * not specified by the map, the compiler will output a warning.
+ *
+ * When the mapping is passed to the compiler, it will replace calls to
+ * goog.getCssName with the strings from the mapping, e.g.
+ *     var x = goog.getCssName('foo');
+ *     var y = goog.getCssName(this.baseClass, 'active');
+ *  becomes:
+ *     var x= 'foo';
+ *     var y = this.baseClass + '-active';
+ *
+ * If one argument is passed it will be processed, if two are passed only the
+ * modifier will be processed, as it is assumed the first argument was generated
+ * as a result of calling goog.getCssName.
+ *
+ * @param {string} className The class name.
+ * @param {string=} opt_modifier A modifier to be appended to the class name.
+ * @return {string} The class name or the concatenation of the class name and
+ *     the modifier.
+ */
+goog.getCssName = function(className, opt_modifier) {
+  var getMapping = function(cssName) {
+    return goog.cssNameMapping_[cssName] || cssName;
+  };
+
+  var renameByParts = function(cssName) {
+    // Remap all the parts individually.
+    var parts = cssName.split('-');
+    var mapped = [];
+    for (var i = 0; i < parts.length; i++) {
+      mapped.push(getMapping(parts[i]));
+    }
+    return mapped.join('-');
+  };
+
+  var rename;
+  if (goog.cssNameMapping_) {
+    rename = goog.cssNameMappingStyle_ == 'BY_WHOLE' ?
+        getMapping : renameByParts;
+  } else {
+    rename = function(a) {
+      return a;
+    };
+  }
+
+  if (opt_modifier) {
+    return className + '-' + rename(opt_modifier);
+  } else {
+    return rename(className);
+  }
+};
+
+
+/**
+ * Sets the map to check when returning a value from goog.getCssName(). Example:
+ * <pre>
+ * goog.setCssNameMapping({
+ *   "goog": "a",
+ *   "disabled": "b",
+ * });
+ *
+ * var x = goog.getCssName('goog');
+ * // The following evaluates to: "a a-b".
+ * goog.getCssName('goog') + ' ' + goog.getCssName(x, 'disabled')
+ * </pre>
+ * When declared as a map of string literals to string literals, the JSCompiler
+ * will replace all calls to goog.getCssName() using the supplied map if the
+ * --process_closure_primitives flag is set.
+ *
+ * @param {!Object} mapping A map of strings to strings where keys are possible
+ *     arguments to goog.getCssName() and values are the corresponding values
+ *     that should be returned.
+ * @param {string=} opt_style The style of css name mapping. There are two valid
+ *     options: 'BY_PART', and 'BY_WHOLE'.
+ * @see goog.getCssName for a description.
+ */
+goog.setCssNameMapping = function(mapping, opt_style) {
+  goog.cssNameMapping_ = mapping;
+  goog.cssNameMappingStyle_ = opt_style;
+};
+
+
+/**
+ * To use CSS renaming in compiled mode, one of the input files should have a
+ * call to goog.setCssNameMapping() with an object literal that the JSCompiler
+ * can extract and use to replace all calls to goog.getCssName(). In uncompiled
+ * mode, JavaScript code should be loaded before this base.js file that declares
+ * a global variable, CLOSURE_CSS_NAME_MAPPING, which is used below. This is
+ * to ensure that the mapping is loaded before any calls to goog.getCssName()
+ * are made in uncompiled mode.
+ *
+ * A hook for overriding the CSS name mapping.
+ * @type {!Object<string, string>|undefined}
+ */
+goog.global.CLOSURE_CSS_NAME_MAPPING;
+
+
+if (!COMPILED && goog.global.CLOSURE_CSS_NAME_MAPPING) {
+  // This does not call goog.setCssNameMapping() because the JSCompiler
+  // requires that goog.setCssNameMapping() be called with an object literal.
+  goog.cssNameMapping_ = goog.global.CLOSURE_CSS_NAME_MAPPING;
+}
+
+
+/**
+ * Gets a localized message.
+ *
+ * This function is a compiler primitive. If you give the compiler a localized
+ * message bundle, it will replace the string at compile-time with a localized
+ * version, and expand goog.getMsg call to a concatenated string.
+ *
+ * Messages must be initialized in the form:
+ * <code>
+ * var MSG_NAME = goog.getMsg('Hello {$placeholder}', {'placeholder': 'world'});
+ * </code>
+ *
+ * @param {string} str Translatable string, places holders in the form {$foo}.
+ * @param {Object<string, string>=} opt_values Maps place holder name to value.
+ * @return {string} message with placeholders filled.
+ */
+goog.getMsg = function(str, opt_values) {
+  if (opt_values) {
+    str = str.replace(/\{\$([^}]+)}/g, function(match, key) {
+      return key in opt_values ? opt_values[key] : match;
+    });
+  }
+  return str;
+};
+
+
+/**
+ * Gets a localized message. If the message does not have a translation, gives a
+ * fallback message.
+ *
+ * This is useful when introducing a new message that has not yet been
+ * translated into all languages.
+ *
+ * This function is a compiler primitive. Must be used in the form:
+ * <code>var x = goog.getMsgWithFallback(MSG_A, MSG_B);</code>
+ * where MSG_A and MSG_B were initialized with goog.getMsg.
+ *
+ * @param {string} a The preferred message.
+ * @param {string} b The fallback message.
+ * @return {string} The best translated message.
+ */
+goog.getMsgWithFallback = function(a, b) {
+  return a;
+};
+
+
+/**
+ * Exposes an unobfuscated global namespace path for the given object.
+ * Note that fields of the exported object *will* be obfuscated, unless they are
+ * exported in turn via this function or goog.exportProperty.
+ *
+ * Also handy for making public items that are defined in anonymous closures.
+ *
+ * ex. goog.exportSymbol('public.path.Foo', Foo);
+ *
+ * ex. goog.exportSymbol('public.path.Foo.staticFunction', Foo.staticFunction);
+ *     public.path.Foo.staticFunction();
+ *
+ * ex. goog.exportSymbol('public.path.Foo.prototype.myMethod',
+ *                       Foo.prototype.myMethod);
+ *     new public.path.Foo().myMethod();
+ *
+ * @param {string} publicPath Unobfuscated name to export.
+ * @param {*} object Object the name should point to.
+ * @param {Object=} opt_objectToExportTo The object to add the path to; default
+ *     is goog.global.
+ */
+goog.exportSymbol = function(publicPath, object, opt_objectToExportTo) {
+  goog.exportPath_(publicPath, object, opt_objectToExportTo);
+};
+
+
+/**
+ * Exports a property unobfuscated into the object's namespace.
+ * ex. goog.exportProperty(Foo, 'staticFunction', Foo.staticFunction);
+ * ex. goog.exportProperty(Foo.prototype, 'myMethod', Foo.prototype.myMethod);
+ * @param {Object} object Object whose static property is being exported.
+ * @param {string} publicName Unobfuscated name to export.
+ * @param {*} symbol Object the name should point to.
+ */
+goog.exportProperty = function(object, publicName, symbol) {
+  object[publicName] = symbol;
+};
+
+
+/**
+ * Inherit the prototype methods from one constructor into another.
+ *
+ * Usage:
+ * <pre>
+ * function ParentClass(a, b) { }
+ * ParentClass.prototype.foo = function(a) { };
+ *
+ * function ChildClass(a, b, c) {
+ *   ChildClass.base(this, 'constructor', a, b);
+ * }
+ * goog.inherits(ChildClass, ParentClass);
+ *
+ * var child = new ChildClass('a', 'b', 'see');
+ * child.foo(); // This works.
+ * </pre>
+ *
+ * @param {!Function} childCtor Child class.
+ * @param {!Function} parentCtor Parent class.
+ */
+goog.inherits = function(childCtor, parentCtor) {
+  /** @constructor */
+  function tempCtor() {};
+  tempCtor.prototype = parentCtor.prototype;
+  childCtor.superClass_ = parentCtor.prototype;
+  childCtor.prototype = new tempCtor();
+  /** @override */
+  childCtor.prototype.constructor = childCtor;
+
+  /**
+   * Calls superclass constructor/method.
+   *
+   * This function is only available if you use goog.inherits to
+   * express inheritance relationships between classes.
+   *
+   * NOTE: This is a replacement for goog.base and for superClass_
+   * property defined in childCtor.
+   *
+   * @param {!Object} me Should always be "this".
+   * @param {string} methodName The method name to call. Calling
+   *     superclass constructor can be done with the special string
+   *     'constructor'.
+   * @param {...*} var_args The arguments to pass to superclass
+   *     method/constructor.
+   * @return {*} The return value of the superclass method/constructor.
+   */
+  childCtor.base = function(me, methodName, var_args) {
+    // Copying using loop to avoid deop due to passing arguments object to
+    // function. This is faster in many JS engines as of late 2014.
+    var args = new Array(arguments.length - 2);
+    for (var i = 2; i < arguments.length; i++) {
+      args[i - 2] = arguments[i];
+    }
+    return parentCtor.prototype[methodName].apply(me, args);
+  };
+};
+
+
+/**
+ * Call up to the superclass.
+ *
+ * If this is called from a constructor, then this calls the superclass
+ * constructor with arguments 1-N.
+ *
+ * If this is called from a prototype method, then you must pass the name of the
+ * method as the second argument to this function. If you do not, you will get a
+ * runtime error. This calls the superclass' method with arguments 2-N.
+ *
+ * This function only works if you use goog.inherits to express inheritance
+ * relationships between your classes.
+ *
+ * This function is a compiler primitive. At compile-time, the compiler will do
+ * macro expansion to remove a lot of the extra overhead that this function
+ * introduces. The compiler will also enforce a lot of the assumptions that this
+ * function makes, and treat it as a compiler error if you break them.
+ *
+ * @param {!Object} me Should always be "this".
+ * @param {*=} opt_methodName The method name if calling a super method.
+ * @param {...*} var_args The rest of the arguments.
+ * @return {*} The return value of the superclass method.
+ * @suppress {es5Strict} This method can not be used in strict mode, but
+ *     all Closure Library consumers must depend on this file.
+ */
+goog.base = function(me, opt_methodName, var_args) {
+  var caller = arguments.callee.caller;
+
+  if (goog.STRICT_MODE_COMPATIBLE || (goog.DEBUG && !caller)) {
+    throw Error('arguments.caller not defined.  goog.base() cannot be used ' +
+                'with strict mode code. See ' +
+                'http://www.ecma-international.org/ecma-262/5.1/#sec-C');
+  }
+
+  if (caller.superClass_) {
+    // Copying using loop to avoid deop due to passing arguments object to
+    // function. This is faster in many JS engines as of late 2014.
+    var ctorArgs = new Array(arguments.length - 1);
+    for (var i = 1; i < arguments.length; i++) {
+      ctorArgs[i - 1] = arguments[i];
+    }
+    // This is a constructor. Call the superclass constructor.
+    return caller.superClass_.constructor.apply(me, ctorArgs);
+  }
+
+  // Copying using loop to avoid deop due to passing arguments object to
+  // function. This is faster in many JS engines as of late 2014.
+  var args = new Array(arguments.length - 2);
+  for (var i = 2; i < arguments.length; i++) {
+    args[i - 2] = arguments[i];
+  }
+  var foundCaller = false;
+  for (var ctor = me.constructor;
+       ctor; ctor = ctor.superClass_ && ctor.superClass_.constructor) {
+    if (ctor.prototype[opt_methodName] === caller) {
+      foundCaller = true;
+    } else if (foundCaller) {
+      return ctor.prototype[opt_methodName].apply(me, args);
+    }
+  }
+
+  // If we did not find the caller in the prototype chain, then one of two
+  // things happened:
+  // 1) The caller is an instance method.
+  // 2) This method was not called by the right caller.
+  if (me[opt_methodName] === caller) {
+    return me.constructor.prototype[opt_methodName].apply(me, args);
+  } else {
+    throw Error(
+        'goog.base called from a method of one name ' +
+        'to a method of a different name');
+  }
+};
+
+
+/**
+ * Allow for aliasing within scope functions.  This function exists for
+ * uncompiled code - in compiled code the calls will be inlined and the aliases
+ * applied.  In uncompiled code the function is simply run since the aliases as
+ * written are valid JavaScript.
+ *
+ *
+ * @param {function()} fn Function to call.  This function can contain aliases
+ *     to namespaces (e.g. "var dom = goog.dom") or classes
+ *     (e.g. "var Timer = goog.Timer").
+ */
+goog.scope = function(fn) {
+  fn.call(goog.global);
+};
+
+
+/*
+ * To support uncompiled, strict mode bundles that use eval to divide source
+ * like so:
+ *    eval('someSource;//# sourceUrl sourcefile.js');
+ * We need to export the globally defined symbols "goog" and "COMPILED".
+ * Exporting "goog" breaks the compiler optimizations, so we required that
+ * be defined externally.
+ * NOTE: We don't use goog.exportSymbol here because we don't want to trigger
+ * extern generation when that compiler option is enabled.
+ */
+if (!COMPILED) {
+  goog.global['COMPILED'] = COMPILED;
+}
+
+
+
+//==============================================================================
+// goog.defineClass implementation
+//==============================================================================
+
+
+/**
+ * Creates a restricted form of a Closure "class":
+ *   - from the compiler's perspective, the instance returned from the
+ *     constructor is sealed (no new properties may be added).  This enables
+ *     better checks.
+ *   - the compiler will rewrite this definition to a form that is optimal
+ *     for type checking and optimization (initially this will be a more
+ *     traditional form).
+ *
+ * @param {Function} superClass The superclass, Object or null.
+ * @param {goog.defineClass.ClassDescriptor} def
+ *     An object literal describing
+ *     the class.  It may have the following properties:
+ *     "constructor": the constructor function
+ *     "statics": an object literal containing methods to add to the constructor
+ *        as "static" methods or a function that will receive the constructor
+ *        function as its only parameter to which static properties can
+ *        be added.
+ *     all other properties are added to the prototype.
+ * @return {!Function} The class constructor.
+ */
+goog.defineClass = function(superClass, def) {
+  // TODO(johnlenz): consider making the superClass an optional parameter.
+  var constructor = def.constructor;
+  var statics = def.statics;
+  // Wrap the constructor prior to setting up the prototype and static methods.
+  if (!constructor || constructor == Object.prototype.constructor) {
+    constructor = function() {
+      throw Error('cannot instantiate an interface (no constructor defined).');
+    };
+  }
+
+  var cls = goog.defineClass.createSealingConstructor_(constructor, superClass);
+  if (superClass) {
+    goog.inherits(cls, superClass);
+  }
+
+  // Remove all the properties that should not be copied to the prototype.
+  delete def.constructor;
+  delete def.statics;
+
+  goog.defineClass.applyProperties_(cls.prototype, def);
+  if (statics != null) {
+    if (statics instanceof Function) {
+      statics(cls);
+    } else {
+      goog.defineClass.applyProperties_(cls, statics);
+    }
+  }
+
+  return cls;
+};
+
+
+/**
+ * @typedef {
+ *     !Object|
+ *     {constructor:!Function}|
+ *     {constructor:!Function, statics:(Object|function(Function):void)}}
+ * @suppress {missingProvide}
+ */
+goog.defineClass.ClassDescriptor;
+
+
+/**
+ * @define {boolean} Whether the instances returned by
+ * goog.defineClass should be sealed when possible.
+ */
+goog.define('goog.defineClass.SEAL_CLASS_INSTANCES', goog.DEBUG);
+
+
+/**
+ * If goog.defineClass.SEAL_CLASS_INSTANCES is enabled and Object.seal is
+ * defined, this function will wrap the constructor in a function that seals the
+ * results of the provided constructor function.
+ *
+ * @param {!Function} ctr The constructor whose results maybe be sealed.
+ * @param {Function} superClass The superclass constructor.
+ * @return {!Function} The replacement constructor.
+ * @private
+ */
+goog.defineClass.createSealingConstructor_ = function(ctr, superClass) {
+  if (goog.defineClass.SEAL_CLASS_INSTANCES &&
+      Object.seal instanceof Function) {
+    // Don't seal subclasses of unsealable-tagged legacy classes.
+    if (superClass && superClass.prototype &&
+        superClass.prototype[goog.UNSEALABLE_CONSTRUCTOR_PROPERTY_]) {
+      return ctr;
+    }
+    /**
+     * @this {Object}
+     * @return {?}
+     */
+    var wrappedCtr = function() {
+      // Don't seal an instance of a subclass when it calls the constructor of
+      // its super class as there is most likely still setup to do.
+      var instance = ctr.apply(this, arguments) || this;
+      instance[goog.UID_PROPERTY_] = instance[goog.UID_PROPERTY_];
+      if (this.constructor === wrappedCtr) {
+        Object.seal(instance);
+      }
+      return instance;
+    };
+    return wrappedCtr;
+  }
+  return ctr;
+};
+
+
+// TODO(johnlenz): share these values with the goog.object
+/**
+ * The names of the fields that are defined on Object.prototype.
+ * @type {!Array<string>}
+ * @private
+ * @const
+ */
+goog.defineClass.OBJECT_PROTOTYPE_FIELDS_ = [
+  'constructor',
+  'hasOwnProperty',
+  'isPrototypeOf',
+  'propertyIsEnumerable',
+  'toLocaleString',
+  'toString',
+  'valueOf'
+];
+
+
+// TODO(johnlenz): share this function with the goog.object
+/**
+ * @param {!Object} target The object to add properties to.
+ * @param {!Object} source The object to copy properties from.
+ * @private
+ */
+goog.defineClass.applyProperties_ = function(target, source) {
+  // TODO(johnlenz): update this to support ES5 getters/setters
+
+  var key;
+  for (key in source) {
+    if (Object.prototype.hasOwnProperty.call(source, key)) {
+      target[key] = source[key];
+    }
+  }
+
+  // For IE the for-in-loop does not contain any properties that are not
+  // enumerable on the prototype object (for example isPrototypeOf from
+  // Object.prototype) and it will also not include 'replace' on objects that
+  // extend String and change 'replace' (not that it is common for anyone to
+  // extend anything except Object).
+  for (var i = 0; i < goog.defineClass.OBJECT_PROTOTYPE_FIELDS_.length; i++) {
+    key = goog.defineClass.OBJECT_PROTOTYPE_FIELDS_[i];
+    if (Object.prototype.hasOwnProperty.call(source, key)) {
+      target[key] = source[key];
+    }
+  }
+};
+
+
+/**
+ * Sealing classes breaks the older idiom of assigning properties on the
+ * prototype rather than in the constructor.  As such, goog.defineClass
+ * must not seal subclasses of these old-style classes until they are fixed.
+ * Until then, this marks a class as "broken", instructing defineClass
+ * not to seal subclasses.
+ * @param {!Function} ctr The legacy constructor to tag as unsealable.
+ */
+goog.tagUnsealableClass = function(ctr) {
+  if (!COMPILED && goog.defineClass.SEAL_CLASS_INSTANCES) {
+    ctr.prototype[goog.UNSEALABLE_CONSTRUCTOR_PROPERTY_] = true;
+  }
+};
+
+
+/**
+ * Name for unsealable tag property.
+ * @const @private {string}
+ */
+goog.UNSEALABLE_CONSTRUCTOR_PROPERTY_ = 'goog_defineClass_legacy_unsealable';
+
+goog.provide('ol');
+
+
+/**
+ * Constants defined with the define tag cannot be changed in application
+ * code, but can be set at compile time.
+ * Some reduce the size of the build in advanced compile mode.
+ */
+
+
+/**
+ * @define {boolean} Assume touch.  Default is `false`.
+ */
+ol.ASSUME_TOUCH = false;
+
+
+/**
+ * TODO: rename this to something having to do with tile grids
+ * see https://github.com/openlayers/ol3/issues/2076
+ * @define {number} Default maximum zoom for default tile grids.
+ */
+ol.DEFAULT_MAX_ZOOM = 42;
+
+
+/**
+ * @define {number} Default min zoom level for the map view.  Default is `0`.
+ */
+ol.DEFAULT_MIN_ZOOM = 0;
+
+
+/**
+ * @define {number} Default maximum allowed threshold  (in pixels) for
+ *     reprojection triangulation. Default is `0.5`.
+ */
+ol.DEFAULT_RASTER_REPROJECTION_ERROR_THRESHOLD = 0.5;
+
+
+/**
+ * @define {number} Default high water mark.
+ */
+ol.DEFAULT_TILE_CACHE_HIGH_WATER_MARK = 2048;
+
+
+/**
+ * @define {number} Default tile size.
+ */
+ol.DEFAULT_TILE_SIZE = 256;
+
+
+/**
+ * @define {string} Default WMS version.
+ */
+ol.DEFAULT_WMS_VERSION = '1.3.0';
+
+
+/**
+ * @define {number} Hysteresis pixels.
+ */
+ol.DRAG_BOX_HYSTERESIS_PIXELS = 8;
+
+
+/**
+ * @define {boolean} Enable the Canvas renderer.  Default is `true`. Setting
+ *     this to false at compile time in advanced mode removes all code
+ *     supporting the Canvas renderer from the build.
+ */
+ol.ENABLE_CANVAS = true;
+
+
+/**
+ * @define {boolean} Enable the DOM renderer (used as a fallback where Canvas is
+ *     not available).  Default is `true`. Setting this to false at compile time
+ *     in advanced mode removes all code supporting the DOM renderer from the
+ *     build.
+ */
+ol.ENABLE_DOM = true;
+
+
+/**
+ * @define {boolean} Enable rendering of ol.layer.Image based layers.  Default
+ *     is `true`. Setting this to false at compile time in advanced mode removes
+ *     all code supporting Image layers from the build.
+ */
+ol.ENABLE_IMAGE = true;
+
+
+/**
+ * @define {boolean} Enable Closure named colors (`goog.color.names`).
+ *     Enabling these colors adds about 3KB uncompressed / 1.5KB compressed to
+ *     the final build size.  Default is `false`. This setting has no effect
+ *     with Canvas renderer, which uses its own names, whether this is true or
+ *     false.
+ */
+ol.ENABLE_NAMED_COLORS = false;
+
+
+/**
+ * @define {boolean} Enable integration with the Proj4js library.  Default is
+ *     `true`.
+ */
+ol.ENABLE_PROJ4JS = true;
+
+
+/**
+ * @define {boolean} Enable automatic reprojection of raster sources. Default is
+ *     `true`.
+ */
+ol.ENABLE_RASTER_REPROJECTION = true;
+
+
+/**
+ * @define {boolean} Enable rendering of ol.layer.Tile based layers.  Default is
+ *     `true`. Setting this to false at compile time in advanced mode removes
+ *     all code supporting Tile layers from the build.
+ */
+ol.ENABLE_TILE = true;
+
+
+/**
+ * @define {boolean} Enable rendering of ol.layer.Vector based layers.  Default
+ *     is `true`. Setting this to false at compile time in advanced mode removes
+ *     all code supporting Vector layers from the build.
+ */
+ol.ENABLE_VECTOR = true;
+
+
+/**
+ * @define {boolean} Enable rendering of ol.layer.VectorTile based layers.
+ *     Default is `true`. Setting this to false at compile time in advanced mode
+ *     removes all code supporting VectorTile layers from the build.
+ */
+ol.ENABLE_VECTOR_TILE = true;
+
+
+/**
+ * @define {boolean} Enable the WebGL renderer.  Default is `true`. Setting
+ *     this to false at compile time in advanced mode removes all code
+ *     supporting the WebGL renderer from the build.
+ */
+ol.ENABLE_WEBGL = true;
+
+
+/**
+ * @define {number} The size in pixels of the first atlas image. Default is
+ * `256`.
+ */
+ol.INITIAL_ATLAS_SIZE = 256;
+
+
+/**
+ * @define {number} The maximum size in pixels of atlas images. Default is
+ * `-1`, meaning it is not used (and `ol.WEBGL_MAX_TEXTURE_SIZE` is
+ * used instead).
+ */
+ol.MAX_ATLAS_SIZE = -1;
+
+
+/**
+ * @define {number} Maximum mouse wheel delta.
+ */
+ol.MOUSEWHEELZOOM_MAXDELTA = 1;
+
+
+/**
+ * @define {number} Mouse wheel timeout duration.
+ */
+ol.MOUSEWHEELZOOM_TIMEOUT_DURATION = 80;
+
+
+/**
+ * @define {number} Maximum width and/or height extent ratio that determines
+ * when the overview map should be zoomed out.
+ */
+ol.OVERVIEWMAP_MAX_RATIO = 0.75;
+
+
+/**
+ * @define {number} Minimum width and/or height extent ratio that determines
+ * when the overview map should be zoomed in.
+ */
+ol.OVERVIEWMAP_MIN_RATIO = 0.1;
+
+
+/**
+ * @define {number} Maximum number of source tiles for raster reprojection of
+ *     a single tile.
+ *     If too many source tiles are determined to be loaded to create a single
+ *     reprojected tile the browser can become unresponsive or even crash.
+ *     This can happen if the developer defines projections improperly and/or
+ *     with unlimited extents.
+ *     If too many tiles are required, no tiles are loaded and
+ *     `ol.TileState.ERROR` state is set. Default is `100`.
+ */
+ol.RASTER_REPROJECTION_MAX_SOURCE_TILES = 100;
+
+
+/**
+ * @define {number} Maximum number of subdivision steps during raster
+ *     reprojection triangulation. Prevents high memory usage and large
+ *     number of proj4 calls (for certain transformations and areas).
+ *     At most `2*(2^this)` triangles are created for each triangulated
+ *     extent (tile/image). Default is `10`.
+ */
+ol.RASTER_REPROJECTION_MAX_SUBDIVISION = 10;
+
+
+/**
+ * @define {number} Maximum allowed size of triangle relative to world width.
+ *     When transforming corners of world extent between certain projections,
+ *     the resulting triangulation seems to have zero error and no subdivision
+ *     is performed.
+ *     If the triangle width is more than this (relative to world width; 0-1),
+ *     subdivison is forced (up to `ol.RASTER_REPROJECTION_MAX_SUBDIVISION`).
+ *     Default is `0.25`.
+ */
+ol.RASTER_REPROJECTION_MAX_TRIANGLE_WIDTH = 0.25;
+
+
+/**
+ * @define {number} Tolerance for geometry simplification in device pixels.
+ */
+ol.SIMPLIFY_TOLERANCE = 0.5;
+
+
+/**
+ * @define {number} Texture cache high water mark.
+ */
+ol.WEBGL_TEXTURE_CACHE_HIGH_WATER_MARK = 1024;
+
+
+/**
+ * The maximum supported WebGL texture size in pixels. If WebGL is not
+ * supported, the value is set to `undefined`.
+ * @const
+ * @type {number|undefined}
+ */
+ol.WEBGL_MAX_TEXTURE_SIZE; // value is set in `ol.has`
+
+
+/**
+ * List of supported WebGL extensions.
+ * @const
+ * @type {Array.<string>}
+ */
+ol.WEBGL_EXTENSIONS; // value is set in `ol.has`
+
+
+/**
+ * Inherit the prototype methods from one constructor into another.
+ *
+ * Usage:
+ *
+ *     function ParentClass(a, b) { }
+ *     ParentClass.prototype.foo = function(a) { }
+ *
+ *     function ChildClass(a, b, c) {
+ *       // Call parent constructor
+ *       ParentClass.call(this, a, b);
+ *     }
+ *     ol.inherits(ChildClass, ParentClass);
+ *
+ *     var child = new ChildClass('a', 'b', 'see');
+ *     child.foo(); // This works.
+ *
+ * In addition, a superclass' implementation of a method can be invoked as
+ * follows:
+ *
+ *     ChildClass.prototype.foo = function(a) {
+ *       ChildClass.base(this, 'foo', a);
+ *       // Other code here.
+ *     };
+ *
+ * @param {!Function} childCtor Child constructor.
+ * @param {!Function} parentCtor Parent constructor.
+ * @function
+ * @api
+ */
+ol.inherits =
+    goog.inherits;
+// note that the newline above is necessary to satisfy the linter
+
+
+/**
+ * A reusable function, used e.g. as a default for callbacks.
+ *
+ * @return {undefined} Nothing.
+ */
+ol.nullFunction = function() {};
+
+// FIXME factor out common code between usedTiles and wantedTiles
+
+goog.provide('ol.PostRenderFunction');
+goog.provide('ol.PreRenderFunction');
+
+
+/**
+ * @typedef {function(ol.Map, ?olx.FrameState): boolean}
+ */
+ol.PostRenderFunction;
+
+
+/**
+ * Function to perform manipulations before rendering. This function is called
+ * with the {@link ol.Map} as first and an optional {@link olx.FrameState} as
+ * second argument. Return `true` to keep this function for the next frame,
+ * `false` to remove it.
+ * @typedef {function(ol.Map, ?olx.FrameState): boolean}
+ * @api
+ */
+ol.PreRenderFunction;
+
+// Copyright 2009 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Provides a base class for custom Error objects such that the
+ * stack is correctly maintained.
+ *
+ * You should never need to throw goog.debug.Error(msg) directly, Error(msg) is
+ * sufficient.
+ *
+ */
+
+goog.provide('goog.debug.Error');
+
+
+
+/**
+ * Base class for custom error objects.
+ * @param {*=} opt_msg The message associated with the error.
+ * @constructor
+ * @extends {Error}
+ */
+goog.debug.Error = function(opt_msg) {
+
+  // Attempt to ensure there is a stack trace.
+  if (Error.captureStackTrace) {
+    Error.captureStackTrace(this, goog.debug.Error);
+  } else {
+    var stack = new Error().stack;
+    if (stack) {
+      this.stack = stack;
+    }
+  }
+
+  if (opt_msg) {
+    this.message = String(opt_msg);
+  }
+
+  /**
+   * Whether to report this error to the server. Setting this to false will
+   * cause the error reporter to not report the error back to the server,
+   * which can be useful if the client knows that the error has already been
+   * logged on the server.
+   * @type {boolean}
+   */
+  this.reportErrorToServer = true;
+};
+goog.inherits(goog.debug.Error, Error);
+
+
+/** @override */
+goog.debug.Error.prototype.name = 'CustomError';
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Definition of goog.dom.NodeType.
+ */
+
+goog.provide('goog.dom.NodeType');
+
+
+/**
+ * Constants for the nodeType attribute in the Node interface.
+ *
+ * These constants match those specified in the Node interface. These are
+ * usually present on the Node object in recent browsers, but not in older
+ * browsers (specifically, early IEs) and thus are given here.
+ *
+ * In some browsers (early IEs), these are not defined on the Node object,
+ * so they are provided here.
+ *
+ * See http://www.w3.org/TR/DOM-Level-2-Core/core.html#ID-1950641247
+ * @enum {number}
+ */
+goog.dom.NodeType = {
+  ELEMENT: 1,
+  ATTRIBUTE: 2,
+  TEXT: 3,
+  CDATA_SECTION: 4,
+  ENTITY_REFERENCE: 5,
+  ENTITY: 6,
+  PROCESSING_INSTRUCTION: 7,
+  COMMENT: 8,
+  DOCUMENT: 9,
+  DOCUMENT_TYPE: 10,
+  DOCUMENT_FRAGMENT: 11,
+  NOTATION: 12
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Utilities for string manipulation.
+ * @author arv@google.com (Erik Arvidsson)
+ */
+
+
+/**
+ * Namespace for string utilities
+ */
+goog.provide('goog.string');
+goog.provide('goog.string.Unicode');
+
+
+/**
+ * @define {boolean} Enables HTML escaping of lowercase letter "e" which helps
+ * with detection of double-escaping as this letter is frequently used.
+ */
+goog.define('goog.string.DETECT_DOUBLE_ESCAPING', false);
+
+
+/**
+ * @define {boolean} Whether to force non-dom html unescaping.
+ */
+goog.define('goog.string.FORCE_NON_DOM_HTML_UNESCAPING', false);
+
+
+/**
+ * Common Unicode string characters.
+ * @enum {string}
+ */
+goog.string.Unicode = {
+  NBSP: '\xa0'
+};
+
+
+/**
+ * Fast prefix-checker.
+ * @param {string} str The string to check.
+ * @param {string} prefix A string to look for at the start of {@code str}.
+ * @return {boolean} True if {@code str} begins with {@code prefix}.
+ */
+goog.string.startsWith = function(str, prefix) {
+  return str.lastIndexOf(prefix, 0) == 0;
+};
+
+
+/**
+ * Fast suffix-checker.
+ * @param {string} str The string to check.
+ * @param {string} suffix A string to look for at the end of {@code str}.
+ * @return {boolean} True if {@code str} ends with {@code suffix}.
+ */
+goog.string.endsWith = function(str, suffix) {
+  var l = str.length - suffix.length;
+  return l >= 0 && str.indexOf(suffix, l) == l;
+};
+
+
+/**
+ * Case-insensitive prefix-checker.
+ * @param {string} str The string to check.
+ * @param {string} prefix  A string to look for at the end of {@code str}.
+ * @return {boolean} True if {@code str} begins with {@code prefix} (ignoring
+ *     case).
+ */
+goog.string.caseInsensitiveStartsWith = function(str, prefix) {
+  return goog.string.caseInsensitiveCompare(
+      prefix, str.substr(0, prefix.length)) == 0;
+};
+
+
+/**
+ * Case-insensitive suffix-checker.
+ * @param {string} str The string to check.
+ * @param {string} suffix A string to look for at the end of {@code str}.
+ * @return {boolean} True if {@code str} ends with {@code suffix} (ignoring
+ *     case).
+ */
+goog.string.caseInsensitiveEndsWith = function(str, suffix) {
+  return goog.string.caseInsensitiveCompare(
+      suffix, str.substr(str.length - suffix.length, suffix.length)) == 0;
+};
+
+
+/**
+ * Case-insensitive equality checker.
+ * @param {string} str1 First string to check.
+ * @param {string} str2 Second string to check.
+ * @return {boolean} True if {@code str1} and {@code str2} are the same string,
+ *     ignoring case.
+ */
+goog.string.caseInsensitiveEquals = function(str1, str2) {
+  return str1.toLowerCase() == str2.toLowerCase();
+};
+
+
+/**
+ * Does simple python-style string substitution.
+ * subs("foo%s hot%s", "bar", "dog") becomes "foobar hotdog".
+ * @param {string} str The string containing the pattern.
+ * @param {...*} var_args The items to substitute into the pattern.
+ * @return {string} A copy of {@code str} in which each occurrence of
+ *     {@code %s} has been replaced an argument from {@code var_args}.
+ */
+goog.string.subs = function(str, var_args) {
+  var splitParts = str.split('%s');
+  var returnString = '';
+
+  var subsArguments = Array.prototype.slice.call(arguments, 1);
+  while (subsArguments.length &&
+         // Replace up to the last split part. We are inserting in the
+         // positions between split parts.
+         splitParts.length > 1) {
+    returnString += splitParts.shift() + subsArguments.shift();
+  }
+
+  return returnString + splitParts.join('%s'); // Join unused '%s'
+};
+
+
+/**
+ * Converts multiple whitespace chars (spaces, non-breaking-spaces, new lines
+ * and tabs) to a single space, and strips leading and trailing whitespace.
+ * @param {string} str Input string.
+ * @return {string} A copy of {@code str} with collapsed whitespace.
+ */
+goog.string.collapseWhitespace = function(str) {
+  // Since IE doesn't include non-breaking-space (0xa0) in their \s character
+  // class (as required by section 7.2 of the ECMAScript spec), we explicitly
+  // include it in the regexp to enforce consistent cross-browser behavior.
+  return str.replace(/[\s\xa0]+/g, ' ').replace(/^\s+|\s+$/g, '');
+};
+
+
+/**
+ * Checks if a string is empty or contains only whitespaces.
+ * @param {string} str The string to check.
+ * @return {boolean} Whether {@code str} is empty or whitespace only.
+ */
+goog.string.isEmptyOrWhitespace = function(str) {
+  // testing length == 0 first is actually slower in all browsers (about the
+  // same in Opera).
+  // Since IE doesn't include non-breaking-space (0xa0) in their \s character
+  // class (as required by section 7.2 of the ECMAScript spec), we explicitly
+  // include it in the regexp to enforce consistent cross-browser behavior.
+  return /^[\s\xa0]*$/.test(str);
+};
+
+
+/**
+ * Checks if a string is empty.
+ * @param {string} str The string to check.
+ * @return {boolean} Whether {@code str} is empty.
+ */
+goog.string.isEmptyString = function(str) {
+  return str.length == 0;
+};
+
+
+/**
+ * Checks if a string is empty or contains only whitespaces.
+ *
+ * TODO(user): Deprecate this when clients have been switched over to
+ * goog.string.isEmptyOrWhitespace.
+ *
+ * @param {string} str The string to check.
+ * @return {boolean} Whether {@code str} is empty or whitespace only.
+ */
+goog.string.isEmpty = goog.string.isEmptyOrWhitespace;
+
+
+/**
+ * Checks if a string is null, undefined, empty or contains only whitespaces.
+ * @param {*} str The string to check.
+ * @return {boolean} Whether {@code str} is null, undefined, empty, or
+ *     whitespace only.
+ * @deprecated Use goog.string.isEmptyOrWhitespace(goog.string.makeSafe(str))
+ *     instead.
+ */
+goog.string.isEmptyOrWhitespaceSafe = function(str) {
+  return goog.string.isEmptyOrWhitespace(goog.string.makeSafe(str));
+};
+
+
+/**
+ * Checks if a string is null, undefined, empty or contains only whitespaces.
+ *
+ * TODO(user): Deprecate this when clients have been switched over to
+ * goog.string.isEmptyOrWhitespaceSafe.
+ *
+ * @param {*} str The string to check.
+ * @return {boolean} Whether {@code str} is null, undefined, empty, or
+ *     whitespace only.
+ */
+goog.string.isEmptySafe = goog.string.isEmptyOrWhitespaceSafe;
+
+
+/**
+ * Checks if a string is all breaking whitespace.
+ * @param {string} str The string to check.
+ * @return {boolean} Whether the string is all breaking whitespace.
+ */
+goog.string.isBreakingWhitespace = function(str) {
+  return !/[^\t\n\r ]/.test(str);
+};
+
+
+/**
+ * Checks if a string contains all letters.
+ * @param {string} str string to check.
+ * @return {boolean} True if {@code str} consists entirely of letters.
+ */
+goog.string.isAlpha = function(str) {
+  return !/[^a-zA-Z]/.test(str);
+};
+
+
+/**
+ * Checks if a string contains only numbers.
+ * @param {*} str string to check. If not a string, it will be
+ *     casted to one.
+ * @return {boolean} True if {@code str} is numeric.
+ */
+goog.string.isNumeric = function(str) {
+  return !/[^0-9]/.test(str);
+};
+
+
+/**
+ * Checks if a string contains only numbers or letters.
+ * @param {string} str string to check.
+ * @return {boolean} True if {@code str} is alphanumeric.
+ */
+goog.string.isAlphaNumeric = function(str) {
+  return !/[^a-zA-Z0-9]/.test(str);
+};
+
+
+/**
+ * Checks if a character is a space character.
+ * @param {string} ch Character to check.
+ * @return {boolean} True if {@code ch} is a space.
+ */
+goog.string.isSpace = function(ch) {
+  return ch == ' ';
+};
+
+
+/**
+ * Checks if a character is a valid unicode character.
+ * @param {string} ch Character to check.
+ * @return {boolean} True if {@code ch} is a valid unicode character.
+ */
+goog.string.isUnicodeChar = function(ch) {
+  return ch.length == 1 && ch >= ' ' && ch <= '~' ||
+         ch >= '\u0080' && ch <= '\uFFFD';
+};
+
+
+/**
+ * Takes a string and replaces newlines with a space. Multiple lines are
+ * replaced with a single space.
+ * @param {string} str The string from which to strip newlines.
+ * @return {string} A copy of {@code str} stripped of newlines.
+ */
+goog.string.stripNewlines = function(str) {
+  return str.replace(/(\r\n|\r|\n)+/g, ' ');
+};
+
+
+/**
+ * Replaces Windows and Mac new lines with unix style: \r or \r\n with \n.
+ * @param {string} str The string to in which to canonicalize newlines.
+ * @return {string} {@code str} A copy of {@code} with canonicalized newlines.
+ */
+goog.string.canonicalizeNewlines = function(str) {
+  return str.replace(/(\r\n|\r|\n)/g, '\n');
+};
+
+
+/**
+ * Normalizes whitespace in a string, replacing all whitespace chars with
+ * a space.
+ * @param {string} str The string in which to normalize whitespace.
+ * @return {string} A copy of {@code str} with all whitespace normalized.
+ */
+goog.string.normalizeWhitespace = function(str) {
+  return str.replace(/\xa0|\s/g, ' ');
+};
+
+
+/**
+ * Normalizes spaces in a string, replacing all consecutive spaces and tabs
+ * with a single space. Replaces non-breaking space with a space.
+ * @param {string} str The string in which to normalize spaces.
+ * @return {string} A copy of {@code str} with all consecutive spaces and tabs
+ *    replaced with a single space.
+ */
+goog.string.normalizeSpaces = function(str) {
+  return str.replace(/\xa0|[ \t]+/g, ' ');
+};
+
+
+/**
+ * Removes the breaking spaces from the left and right of the string and
+ * collapses the sequences of breaking spaces in the middle into single spaces.
+ * The original and the result strings render the same way in HTML.
+ * @param {string} str A string in which to collapse spaces.
+ * @return {string} Copy of the string with normalized breaking spaces.
+ */
+goog.string.collapseBreakingSpaces = function(str) {
+  return str.replace(/[\t\r\n ]+/g, ' ').replace(
+      /^[\t\r\n ]+|[\t\r\n ]+$/g, '');
+};
+
+
+/**
+ * Trims white spaces to the left and right of a string.
+ * @param {string} str The string to trim.
+ * @return {string} A trimmed copy of {@code str}.
+ */
+goog.string.trim = (goog.TRUSTED_SITE && String.prototype.trim) ?
+    function(str) {
+      return str.trim();
+    } :
+    function(str) {
+      // Since IE doesn't include non-breaking-space (0xa0) in their \s
+      // character class (as required by section 7.2 of the ECMAScript spec),
+      // we explicitly include it in the regexp to enforce consistent
+      // cross-browser behavior.
+      return str.replace(/^[\s\xa0]+|[\s\xa0]+$/g, '');
+    };
+
+
+/**
+ * Trims whitespaces at the left end of a string.
+ * @param {string} str The string to left trim.
+ * @return {string} A trimmed copy of {@code str}.
+ */
+goog.string.trimLeft = function(str) {
+  // Since IE doesn't include non-breaking-space (0xa0) in their \s character
+  // class (as required by section 7.2 of the ECMAScript spec), we explicitly
+  // include it in the regexp to enforce consistent cross-browser behavior.
+  return str.replace(/^[\s\xa0]+/, '');
+};
+
+
+/**
+ * Trims whitespaces at the right end of a string.
+ * @param {string} str The string to right trim.
+ * @return {string} A trimmed copy of {@code str}.
+ */
+goog.string.trimRight = function(str) {
+  // Since IE doesn't include non-breaking-space (0xa0) in their \s character
+  // class (as required by section 7.2 of the ECMAScript spec), we explicitly
+  // include it in the regexp to enforce consistent cross-browser behavior.
+  return str.replace(/[\s\xa0]+$/, '');
+};
+
+
+/**
+ * A string comparator that ignores case.
+ * -1 = str1 less than str2
+ *  0 = str1 equals str2
+ *  1 = str1 greater than str2
+ *
+ * @param {string} str1 The string to compare.
+ * @param {string} str2 The string to compare {@code str1} to.
+ * @return {number} The comparator result, as described above.
+ */
+goog.string.caseInsensitiveCompare = function(str1, str2) {
+  var test1 = String(str1).toLowerCase();
+  var test2 = String(str2).toLowerCase();
+
+  if (test1 < test2) {
+    return -1;
+  } else if (test1 == test2) {
+    return 0;
+  } else {
+    return 1;
+  }
+};
+
+
+/**
+ * Regular expression used for splitting a string into substrings of fractional
+ * numbers, integers, and non-numeric characters.
+ * @type {RegExp}
+ * @private
+ */
+goog.string.numerateCompareRegExp_ = /(\.\d+)|(\d+)|(\D+)/g;
+
+
+/**
+ * String comparison function that handles numbers in a way humans might expect.
+ * Using this function, the string "File 2.jpg" sorts before "File 10.jpg". The
+ * comparison is mostly case-insensitive, though strings that are identical
+ * except for case are sorted with the upper-case strings before lower-case.
+ *
+ * This comparison function is significantly slower (about 500x) than either
+ * the default or the case-insensitive compare. It should not be used in
+ * time-critical code, but should be fast enough to sort several hundred short
+ * strings (like filenames) with a reasonable delay.
+ *
+ * @param {string} str1 The string to compare in a numerically sensitive way.
+ * @param {string} str2 The string to compare {@code str1} to.
+ * @return {number} less than 0 if str1 < str2, 0 if str1 == str2, greater than
+ *     0 if str1 > str2.
+ */
+goog.string.numerateCompare = function(str1, str2) {
+  if (str1 == str2) {
+    return 0;
+  }
+  if (!str1) {
+    return -1;
+  }
+  if (!str2) {
+    return 1;
+  }
+
+  // Using match to split the entire string ahead of time turns out to be faster
+  // for most inputs than using RegExp.exec or iterating over each character.
+  var tokens1 = str1.toLowerCase().match(goog.string.numerateCompareRegExp_);
+  var tokens2 = str2.toLowerCase().match(goog.string.numerateCompareRegExp_);
+
+  var count = Math.min(tokens1.length, tokens2.length);
+
+  for (var i = 0; i < count; i++) {
+    var a = tokens1[i];
+    var b = tokens2[i];
+
+    // Compare pairs of tokens, returning if one token sorts before the other.
+    if (a != b) {
+
+      // Only if both tokens are integers is a special comparison required.
+      // Decimal numbers are sorted as strings (e.g., '.09' < '.1').
+      var num1 = parseInt(a, 10);
+      if (!isNaN(num1)) {
+        var num2 = parseInt(b, 10);
+        if (!isNaN(num2) && num1 - num2) {
+          return num1 - num2;
+        }
+      }
+      return a < b ? -1 : 1;
+    }
+  }
+
+  // If one string is a substring of the other, the shorter string sorts first.
+  if (tokens1.length != tokens2.length) {
+    return tokens1.length - tokens2.length;
+  }
+
+  // The two strings must be equivalent except for case (perfect equality is
+  // tested at the head of the function.) Revert to default ASCII-betical string
+  // comparison to stablize the sort.
+  return str1 < str2 ? -1 : 1;
+};
+
+
+/**
+ * URL-encodes a string
+ * @param {*} str The string to url-encode.
+ * @return {string} An encoded copy of {@code str} that is safe for urls.
+ *     Note that '#', ':', and other characters used to delimit portions
+ *     of URLs *will* be encoded.
+ */
+goog.string.urlEncode = function(str) {
+  return encodeURIComponent(String(str));
+};
+
+
+/**
+ * URL-decodes the string. We need to specially handle '+'s because
+ * the javascript library doesn't convert them to spaces.
+ * @param {string} str The string to url decode.
+ * @return {string} The decoded {@code str}.
+ */
+goog.string.urlDecode = function(str) {
+  return decodeURIComponent(str.replace(/\+/g, ' '));
+};
+
+
+/**
+ * Converts \n to <br>s or <br />s.
+ * @param {string} str The string in which to convert newlines.
+ * @param {boolean=} opt_xml Whether to use XML compatible tags.
+ * @return {string} A copy of {@code str} with converted newlines.
+ */
+goog.string.newLineToBr = function(str, opt_xml) {
+  return str.replace(/(\r\n|\r|\n)/g, opt_xml ? '<br />' : '<br>');
+};
+
+
+/**
+ * Escapes double quote '"' and single quote '\'' characters in addition to
+ * '&', '<', and '>' so that a string can be included in an HTML tag attribute
+ * value within double or single quotes.
+ *
+ * It should be noted that > doesn't need to be escaped for the HTML or XML to
+ * be valid, but it has been decided to escape it for consistency with other
+ * implementations.
+ *
+ * With goog.string.DETECT_DOUBLE_ESCAPING, this function escapes also the
+ * lowercase letter "e".
+ *
+ * NOTE(user):
+ * HtmlEscape is often called during the generation of large blocks of HTML.
+ * Using statics for the regular expressions and strings is an optimization
+ * that can more than half the amount of time IE spends in this function for
+ * large apps, since strings and regexes both contribute to GC allocations.
+ *
+ * Testing for the presence of a character before escaping increases the number
+ * of function calls, but actually provides a speed increase for the average
+ * case -- since the average case often doesn't require the escaping of all 4
+ * characters and indexOf() is much cheaper than replace().
+ * The worst case does suffer slightly from the additional calls, therefore the
+ * opt_isLikelyToContainHtmlChars option has been included for situations
+ * where all 4 HTML entities are very likely to be present and need escaping.
+ *
+ * Some benchmarks (times tended to fluctuate +-0.05ms):
+ *                                     FireFox                     IE6
+ * (no chars / average (mix of cases) / all 4 chars)
+ * no checks                     0.13 / 0.22 / 0.22         0.23 / 0.53 / 0.80
+ * indexOf                       0.08 / 0.17 / 0.26         0.22 / 0.54 / 0.84
+ * indexOf + re test             0.07 / 0.17 / 0.28         0.19 / 0.50 / 0.85
+ *
+ * An additional advantage of checking if replace actually needs to be called
+ * is a reduction in the number of object allocations, so as the size of the
+ * application grows the difference between the various methods would increase.
+ *
+ * @param {string} str string to be escaped.
+ * @param {boolean=} opt_isLikelyToContainHtmlChars Don't perform a check to see
+ *     if the character needs replacing - use this option if you expect each of
+ *     the characters to appear often. Leave false if you expect few html
+ *     characters to occur in your strings, such as if you are escaping HTML.
+ * @return {string} An escaped copy of {@code str}.
+ */
+goog.string.htmlEscape = function(str, opt_isLikelyToContainHtmlChars) {
+
+  if (opt_isLikelyToContainHtmlChars) {
+    str = str.replace(goog.string.AMP_RE_, '&amp;')
+          .replace(goog.string.LT_RE_, '&lt;')
+          .replace(goog.string.GT_RE_, '&gt;')
+          .replace(goog.string.QUOT_RE_, '&quot;')
+          .replace(goog.string.SINGLE_QUOTE_RE_, '&#39;')
+          .replace(goog.string.NULL_RE_, '&#0;');
+    if (goog.string.DETECT_DOUBLE_ESCAPING) {
+      str = str.replace(goog.string.E_RE_, '&#101;');
+    }
+    return str;
+
+  } else {
+    // quick test helps in the case when there are no chars to replace, in
+    // worst case this makes barely a difference to the time taken
+    if (!goog.string.ALL_RE_.test(str)) return str;
+
+    // str.indexOf is faster than regex.test in this case
+    if (str.indexOf('&') != -1) {
+      str = str.replace(goog.string.AMP_RE_, '&amp;');
+    }
+    if (str.indexOf('<') != -1) {
+      str = str.replace(goog.string.LT_RE_, '&lt;');
+    }
+    if (str.indexOf('>') != -1) {
+      str = str.replace(goog.string.GT_RE_, '&gt;');
+    }
+    if (str.indexOf('"') != -1) {
+      str = str.replace(goog.string.QUOT_RE_, '&quot;');
+    }
+    if (str.indexOf('\'') != -1) {
+      str = str.replace(goog.string.SINGLE_QUOTE_RE_, '&#39;');
+    }
+    if (str.indexOf('\x00') != -1) {
+      str = str.replace(goog.string.NULL_RE_, '&#0;');
+    }
+    if (goog.string.DETECT_DOUBLE_ESCAPING && str.indexOf('e') != -1) {
+      str = str.replace(goog.string.E_RE_, '&#101;');
+    }
+    return str;
+  }
+};
+
+
+/**
+ * Regular expression that matches an ampersand, for use in escaping.
+ * @const {!RegExp}
+ * @private
+ */
+goog.string.AMP_RE_ = /&/g;
+
+
+/**
+ * Regular expression that matches a less than sign, for use in escaping.
+ * @const {!RegExp}
+ * @private
+ */
+goog.string.LT_RE_ = /</g;
+
+
+/**
+ * Regular expression that matches a greater than sign, for use in escaping.
+ * @const {!RegExp}
+ * @private
+ */
+goog.string.GT_RE_ = />/g;
+
+
+/**
+ * Regular expression that matches a double quote, for use in escaping.
+ * @const {!RegExp}
+ * @private
+ */
+goog.string.QUOT_RE_ = /"/g;
+
+
+/**
+ * Regular expression that matches a single quote, for use in escaping.
+ * @const {!RegExp}
+ * @private
+ */
+goog.string.SINGLE_QUOTE_RE_ = /'/g;
+
+
+/**
+ * Regular expression that matches null character, for use in escaping.
+ * @const {!RegExp}
+ * @private
+ */
+goog.string.NULL_RE_ = /\x00/g;
+
+
+/**
+ * Regular expression that matches a lowercase letter "e", for use in escaping.
+ * @const {!RegExp}
+ * @private
+ */
+goog.string.E_RE_ = /e/g;
+
+
+/**
+ * Regular expression that matches any character that needs to be escaped.
+ * @const {!RegExp}
+ * @private
+ */
+goog.string.ALL_RE_ = (goog.string.DETECT_DOUBLE_ESCAPING ?
+    /[\x00&<>"'e]/ :
+    /[\x00&<>"']/);
+
+
+/**
+ * Unescapes an HTML string.
+ *
+ * @param {string} str The string to unescape.
+ * @return {string} An unescaped copy of {@code str}.
+ */
+goog.string.unescapeEntities = function(str) {
+  if (goog.string.contains(str, '&')) {
+    // We are careful not to use a DOM if we do not have one or we explicitly
+    // requested non-DOM html unescaping.
+    if (!goog.string.FORCE_NON_DOM_HTML_UNESCAPING &&
+        'document' in goog.global) {
+      return goog.string.unescapeEntitiesUsingDom_(str);
+    } else {
+      // Fall back on pure XML entities
+      return goog.string.unescapePureXmlEntities_(str);
+    }
+  }
+  return str;
+};
+
+
+/**
+ * Unescapes a HTML string using the provided document.
+ *
+ * @param {string} str The string to unescape.
+ * @param {!Document} document A document to use in escaping the string.
+ * @return {string} An unescaped copy of {@code str}.
+ */
+goog.string.unescapeEntitiesWithDocument = function(str, document) {
+  if (goog.string.contains(str, '&')) {
+    return goog.string.unescapeEntitiesUsingDom_(str, document);
+  }
+  return str;
+};
+
+
+/**
+ * Unescapes an HTML string using a DOM to resolve non-XML, non-numeric
+ * entities. This function is XSS-safe and whitespace-preserving.
+ * @private
+ * @param {string} str The string to unescape.
+ * @param {Document=} opt_document An optional document to use for creating
+ *     elements. If this is not specified then the default window.document
+ *     will be used.
+ * @return {string} The unescaped {@code str} string.
+ */
+goog.string.unescapeEntitiesUsingDom_ = function(str, opt_document) {
+  /** @type {!Object<string, string>} */
+  var seen = {'&amp;': '&', '&lt;': '<', '&gt;': '>', '&quot;': '"'};
+  var div;
+  if (opt_document) {
+    div = opt_document.createElement('div');
+  } else {
+    div = goog.global.document.createElement('div');
+  }
+  // Match as many valid entity characters as possible. If the actual entity
+  // happens to be shorter, it will still work as innerHTML will return the
+  // trailing characters unchanged. Since the entity characters do not include
+  // open angle bracket, there is no chance of XSS from the innerHTML use.
+  // Since no whitespace is passed to innerHTML, whitespace is preserved.
+  return str.replace(goog.string.HTML_ENTITY_PATTERN_, function(s, entity) {
+    // Check for cached entity.
+    var value = seen[s];
+    if (value) {
+      return value;
+    }
+    // Check for numeric entity.
+    if (entity.charAt(0) == '#') {
+      // Prefix with 0 so that hex entities (e.g. &#x10) parse as hex numbers.
+      var n = Number('0' + entity.substr(1));
+      if (!isNaN(n)) {
+        value = String.fromCharCode(n);
+      }
+    }
+    // Fall back to innerHTML otherwise.
+    if (!value) {
+      // Append a non-entity character to avoid a bug in Webkit that parses
+      // an invalid entity at the end of innerHTML text as the empty string.
+      div.innerHTML = s + ' ';
+      // Then remove the trailing character from the result.
+      value = div.firstChild.nodeValue.slice(0, -1);
+    }
+    // Cache and return.
+    return seen[s] = value;
+  });
+};
+
+
+/**
+ * Unescapes XML entities.
+ * @private
+ * @param {string} str The string to unescape.
+ * @return {string} An unescaped copy of {@code str}.
+ */
+goog.string.unescapePureXmlEntities_ = function(str) {
+  return str.replace(/&([^;]+);/g, function(s, entity) {
+    switch (entity) {
+      case 'amp':
+        return '&';
+      case 'lt':
+        return '<';
+      case 'gt':
+        return '>';
+      case 'quot':
+        return '"';
+      default:
+        if (entity.charAt(0) == '#') {
+          // Prefix with 0 so that hex entities (e.g. &#x10) parse as hex.
+          var n = Number('0' + entity.substr(1));
+          if (!isNaN(n)) {
+            return String.fromCharCode(n);
+          }
+        }
+        // For invalid entities we just return the entity
+        return s;
+    }
+  });
+};
+
+
+/**
+ * Regular expression that matches an HTML entity.
+ * See also HTML5: Tokenization / Tokenizing character references.
+ * @private
+ * @type {!RegExp}
+ */
+goog.string.HTML_ENTITY_PATTERN_ = /&([^;\s<&]+);?/g;
+
+
+/**
+ * Do escaping of whitespace to preserve spatial formatting. We use character
+ * entity #160 to make it safer for xml.
+ * @param {string} str The string in which to escape whitespace.
+ * @param {boolean=} opt_xml Whether to use XML compatible tags.
+ * @return {string} An escaped copy of {@code str}.
+ */
+goog.string.whitespaceEscape = function(str, opt_xml) {
+  // This doesn't use goog.string.preserveSpaces for backwards compatibility.
+  return goog.string.newLineToBr(str.replace(/  /g, ' &#160;'), opt_xml);
+};
+
+
+/**
+ * Preserve spaces that would be otherwise collapsed in HTML by replacing them
+ * with non-breaking space Unicode characters.
+ * @param {string} str The string in which to preserve whitespace.
+ * @return {string} A copy of {@code str} with preserved whitespace.
+ */
+goog.string.preserveSpaces = function(str) {
+  return str.replace(/(^|[\n ]) /g, '$1' + goog.string.Unicode.NBSP);
+};
+
+
+/**
+ * Strip quote characters around a string.  The second argument is a string of
+ * characters to treat as quotes.  This can be a single character or a string of
+ * multiple character and in that case each of those are treated as possible
+ * quote characters. For example:
+ *
+ * <pre>
+ * goog.string.stripQuotes('"abc"', '"`') --> 'abc'
+ * goog.string.stripQuotes('`abc`', '"`') --> 'abc'
+ * </pre>
+ *
+ * @param {string} str The string to strip.
+ * @param {string} quoteChars The quote characters to strip.
+ * @return {string} A copy of {@code str} without the quotes.
+ */
+goog.string.stripQuotes = function(str, quoteChars) {
+  var length = quoteChars.length;
+  for (var i = 0; i < length; i++) {
+    var quoteChar = length == 1 ? quoteChars : quoteChars.charAt(i);
+    if (str.charAt(0) == quoteChar && str.charAt(str.length - 1) == quoteChar) {
+      return str.substring(1, str.length - 1);
+    }
+  }
+  return str;
+};
+
+
+/**
+ * Truncates a string to a certain length and adds '...' if necessary.  The
+ * length also accounts for the ellipsis, so a maximum length of 10 and a string
+ * 'Hello World!' produces 'Hello W...'.
+ * @param {string} str The string to truncate.
+ * @param {number} chars Max number of characters.
+ * @param {boolean=} opt_protectEscapedCharacters Whether to protect escaped
+ *     characters from being cut off in the middle.
+ * @return {string} The truncated {@code str} string.
+ */
+goog.string.truncate = function(str, chars, opt_protectEscapedCharacters) {
+  if (opt_protectEscapedCharacters) {
+    str = goog.string.unescapeEntities(str);
+  }
+
+  if (str.length > chars) {
+    str = str.substring(0, chars - 3) + '...';
+  }
+
+  if (opt_protectEscapedCharacters) {
+    str = goog.string.htmlEscape(str);
+  }
+
+  return str;
+};
+
+
+/**
+ * Truncate a string in the middle, adding "..." if necessary,
+ * and favoring the beginning of the string.
+ * @param {string} str The string to truncate the middle of.
+ * @param {number} chars Max number of characters.
+ * @param {boolean=} opt_protectEscapedCharacters Whether to protect escaped
+ *     characters from being cutoff in the middle.
+ * @param {number=} opt_trailingChars Optional number of trailing characters to
+ *     leave at the end of the string, instead of truncating as close to the
+ *     middle as possible.
+ * @return {string} A truncated copy of {@code str}.
+ */
+goog.string.truncateMiddle = function(str, chars,
+    opt_protectEscapedCharacters, opt_trailingChars) {
+  if (opt_protectEscapedCharacters) {
+    str = goog.string.unescapeEntities(str);
+  }
+
+  if (opt_trailingChars && str.length > chars) {
+    if (opt_trailingChars > chars) {
+      opt_trailingChars = chars;
+    }
+    var endPoint = str.length - opt_trailingChars;
+    var startPoint = chars - opt_trailingChars;
+    str = str.substring(0, startPoint) + '...' + str.substring(endPoint);
+  } else if (str.length > chars) {
+    // Favor the beginning of the string:
+    var half = Math.floor(chars / 2);
+    var endPos = str.length - half;
+    half += chars % 2;
+    str = str.substring(0, half) + '...' + str.substring(endPos);
+  }
+
+  if (opt_protectEscapedCharacters) {
+    str = goog.string.htmlEscape(str);
+  }
+
+  return str;
+};
+
+
+/**
+ * Special chars that need to be escaped for goog.string.quote.
+ * @private {!Object<string, string>}
+ */
+goog.string.specialEscapeChars_ = {
+  '\0': '\\0',
+  '\b': '\\b',
+  '\f': '\\f',
+  '\n': '\\n',
+  '\r': '\\r',
+  '\t': '\\t',
+  '\x0B': '\\x0B', // '\v' is not supported in JScript
+  '"': '\\"',
+  '\\': '\\\\'
+};
+
+
+/**
+ * Character mappings used internally for goog.string.escapeChar.
+ * @private {!Object<string, string>}
+ */
+goog.string.jsEscapeCache_ = {
+  '\'': '\\\''
+};
+
+
+/**
+ * Encloses a string in double quotes and escapes characters so that the
+ * string is a valid JS string.
+ * @param {string} s The string to quote.
+ * @return {string} A copy of {@code s} surrounded by double quotes.
+ */
+goog.string.quote = function(s) {
+  s = String(s);
+  if (s.quote) {
+    return s.quote();
+  } else {
+    var sb = ['"'];
+    for (var i = 0; i < s.length; i++) {
+      var ch = s.charAt(i);
+      var cc = ch.charCodeAt(0);
+      sb[i + 1] = goog.string.specialEscapeChars_[ch] ||
+          ((cc > 31 && cc < 127) ? ch : goog.string.escapeChar(ch));
+    }
+    sb.push('"');
+    return sb.join('');
+  }
+};
+
+
+/**
+ * Takes a string and returns the escaped string for that character.
+ * @param {string} str The string to escape.
+ * @return {string} An escaped string representing {@code str}.
+ */
+goog.string.escapeString = function(str) {
+  var sb = [];
+  for (var i = 0; i < str.length; i++) {
+    sb[i] = goog.string.escapeChar(str.charAt(i));
+  }
+  return sb.join('');
+};
+
+
+/**
+ * Takes a character and returns the escaped string for that character. For
+ * example escapeChar(String.fromCharCode(15)) -> "\\x0E".
+ * @param {string} c The character to escape.
+ * @return {string} An escaped string representing {@code c}.
+ */
+goog.string.escapeChar = function(c) {
+  if (c in goog.string.jsEscapeCache_) {
+    return goog.string.jsEscapeCache_[c];
+  }
+
+  if (c in goog.string.specialEscapeChars_) {
+    return goog.string.jsEscapeCache_[c] = goog.string.specialEscapeChars_[c];
+  }
+
+  var rv = c;
+  var cc = c.charCodeAt(0);
+  if (cc > 31 && cc < 127) {
+    rv = c;
+  } else {
+    // tab is 9 but handled above
+    if (cc < 256) {
+      rv = '\\x';
+      if (cc < 16 || cc > 256) {
+        rv += '0';
+      }
+    } else {
+      rv = '\\u';
+      if (cc < 4096) { // \u1000
+        rv += '0';
+      }
+    }
+    rv += cc.toString(16).toUpperCase();
+  }
+
+  return goog.string.jsEscapeCache_[c] = rv;
+};
+
+
+/**
+ * Determines whether a string contains a substring.
+ * @param {string} str The string to search.
+ * @param {string} subString The substring to search for.
+ * @return {boolean} Whether {@code str} contains {@code subString}.
+ */
+goog.string.contains = function(str, subString) {
+  return str.indexOf(subString) != -1;
+};
+
+
+/**
+ * Determines whether a string contains a substring, ignoring case.
+ * @param {string} str The string to search.
+ * @param {string} subString The substring to search for.
+ * @return {boolean} Whether {@code str} contains {@code subString}.
+ */
+goog.string.caseInsensitiveContains = function(str, subString) {
+  return goog.string.contains(str.toLowerCase(), subString.toLowerCase());
+};
+
+
+/**
+ * Returns the non-overlapping occurrences of ss in s.
+ * If either s or ss evalutes to false, then returns zero.
+ * @param {string} s The string to look in.
+ * @param {string} ss The string to look for.
+ * @return {number} Number of occurrences of ss in s.
+ */
+goog.string.countOf = function(s, ss) {
+  return s && ss ? s.split(ss).length - 1 : 0;
+};
+
+
+/**
+ * Removes a substring of a specified length at a specific
+ * index in a string.
+ * @param {string} s The base string from which to remove.
+ * @param {number} index The index at which to remove the substring.
+ * @param {number} stringLength The length of the substring to remove.
+ * @return {string} A copy of {@code s} with the substring removed or the full
+ *     string if nothing is removed or the input is invalid.
+ */
+goog.string.removeAt = function(s, index, stringLength) {
+  var resultStr = s;
+  // If the index is greater or equal to 0 then remove substring
+  if (index >= 0 && index < s.length && stringLength > 0) {
+    resultStr = s.substr(0, index) +
+        s.substr(index + stringLength, s.length - index - stringLength);
+  }
+  return resultStr;
+};
+
+
+/**
+ *  Removes the first occurrence of a substring from a string.
+ *  @param {string} s The base string from which to remove.
+ *  @param {string} ss The string to remove.
+ *  @return {string} A copy of {@code s} with {@code ss} removed or the full
+ *      string if nothing is removed.
+ */
+goog.string.remove = function(s, ss) {
+  var re = new RegExp(goog.string.regExpEscape(ss), '');
+  return s.replace(re, '');
+};
+
+
+/**
+ *  Removes all occurrences of a substring from a string.
+ *  @param {string} s The base string from which to remove.
+ *  @param {string} ss The string to remove.
+ *  @return {string} A copy of {@code s} with {@code ss} removed or the full
+ *      string if nothing is removed.
+ */
+goog.string.removeAll = function(s, ss) {
+  var re = new RegExp(goog.string.regExpEscape(ss), 'g');
+  return s.replace(re, '');
+};
+
+
+/**
+ * Escapes characters in the string that are not safe to use in a RegExp.
+ * @param {*} s The string to escape. If not a string, it will be casted
+ *     to one.
+ * @return {string} A RegExp safe, escaped copy of {@code s}.
+ */
+goog.string.regExpEscape = function(s) {
+  return String(s).replace(/([-()\[\]{}+?*.$\^|,:#<!\\])/g, '\\$1').
+      replace(/\x08/g, '\\x08');
+};
+
+
+/**
+ * Repeats a string n times.
+ * @param {string} string The string to repeat.
+ * @param {number} length The number of times to repeat.
+ * @return {string} A string containing {@code length} repetitions of
+ *     {@code string}.
+ */
+goog.string.repeat = (String.prototype.repeat) ?
+    function(string, length) {
+      // The native method is over 100 times faster than the alternative.
+      return string.repeat(length);
+    } :
+    function(string, length) {
+      return new Array(length + 1).join(string);
+    };
+
+
+/**
+ * Pads number to given length and optionally rounds it to a given precision.
+ * For example:
+ * <pre>padNumber(1.25, 2, 3) -> '01.250'
+ * padNumber(1.25, 2) -> '01.25'
+ * padNumber(1.25, 2, 1) -> '01.3'
+ * padNumber(1.25, 0) -> '1.25'</pre>
+ *
+ * @param {number} num The number to pad.
+ * @param {number} length The desired length.
+ * @param {number=} opt_precision The desired precision.
+ * @return {string} {@code num} as a string with the given options.
+ */
+goog.string.padNumber = function(num, length, opt_precision) {
+  var s = goog.isDef(opt_precision) ? num.toFixed(opt_precision) : String(num);
+  var index = s.indexOf('.');
+  if (index == -1) {
+    index = s.length;
+  }
+  return goog.string.repeat('0', Math.max(0, length - index)) + s;
+};
+
+
+/**
+ * Returns a string representation of the given object, with
+ * null and undefined being returned as the empty string.
+ *
+ * @param {*} obj The object to convert.
+ * @return {string} A string representation of the {@code obj}.
+ */
+goog.string.makeSafe = function(obj) {
+  return obj == null ? '' : String(obj);
+};
+
+
+/**
+ * Concatenates string expressions. This is useful
+ * since some browsers are very inefficient when it comes to using plus to
+ * concat strings. Be careful when using null and undefined here since
+ * these will not be included in the result. If you need to represent these
+ * be sure to cast the argument to a String first.
+ * For example:
+ * <pre>buildString('a', 'b', 'c', 'd') -> 'abcd'
+ * buildString(null, undefined) -> ''
+ * </pre>
+ * @param {...*} var_args A list of strings to concatenate. If not a string,
+ *     it will be casted to one.
+ * @return {string} The concatenation of {@code var_args}.
+ */
+goog.string.buildString = function(var_args) {
+  return Array.prototype.join.call(arguments, '');
+};
+
+
+/**
+ * Returns a string with at least 64-bits of randomness.
+ *
+ * Doesn't trust Javascript's random function entirely. Uses a combination of
+ * random and current timestamp, and then encodes the string in base-36 to
+ * make it shorter.
+ *
+ * @return {string} A random string, e.g. sn1s7vb4gcic.
+ */
+goog.string.getRandomString = function() {
+  var x = 2147483648;
+  return Math.floor(Math.random() * x).toString(36) +
+         Math.abs(Math.floor(Math.random() * x) ^ goog.now()).toString(36);
+};
+
+
+/**
+ * Compares two version numbers.
+ *
+ * @param {string|number} version1 Version of first item.
+ * @param {string|number} version2 Version of second item.
+ *
+ * @return {number}  1 if {@code version1} is higher.
+ *                   0 if arguments are equal.
+ *                  -1 if {@code version2} is higher.
+ */
+goog.string.compareVersions = function(version1, version2) {
+  var order = 0;
+  // Trim leading and trailing whitespace and split the versions into
+  // subversions.
+  var v1Subs = goog.string.trim(String(version1)).split('.');
+  var v2Subs = goog.string.trim(String(version2)).split('.');
+  var subCount = Math.max(v1Subs.length, v2Subs.length);
+
+  // Iterate over the subversions, as long as they appear to be equivalent.
+  for (var subIdx = 0; order == 0 && subIdx < subCount; subIdx++) {
+    var v1Sub = v1Subs[subIdx] || '';
+    var v2Sub = v2Subs[subIdx] || '';
+
+    // Split the subversions into pairs of numbers and qualifiers (like 'b').
+    // Two different RegExp objects are needed because they are both using
+    // the 'g' flag.
+    var v1CompParser = new RegExp('(\\d*)(\\D*)', 'g');
+    var v2CompParser = new RegExp('(\\d*)(\\D*)', 'g');
+    do {
+      var v1Comp = v1CompParser.exec(v1Sub) || ['', '', ''];
+      var v2Comp = v2CompParser.exec(v2Sub) || ['', '', ''];
+      // Break if there are no more matches.
+      if (v1Comp[0].length == 0 && v2Comp[0].length == 0) {
+        break;
+      }
+
+      // Parse the numeric part of the subversion. A missing number is
+      // equivalent to 0.
+      var v1CompNum = v1Comp[1].length == 0 ? 0 : parseInt(v1Comp[1], 10);
+      var v2CompNum = v2Comp[1].length == 0 ? 0 : parseInt(v2Comp[1], 10);
+
+      // Compare the subversion components. The number has the highest
+      // precedence. Next, if the numbers are equal, a subversion without any
+      // qualifier is always higher than a subversion with any qualifier. Next,
+      // the qualifiers are compared as strings.
+      order = goog.string.compareElements_(v1CompNum, v2CompNum) ||
+          goog.string.compareElements_(v1Comp[2].length == 0,
+              v2Comp[2].length == 0) ||
+          goog.string.compareElements_(v1Comp[2], v2Comp[2]);
+      // Stop as soon as an inequality is discovered.
+    } while (order == 0);
+  }
+
+  return order;
+};
+
+
+/**
+ * Compares elements of a version number.
+ *
+ * @param {string|number|boolean} left An element from a version number.
+ * @param {string|number|boolean} right An element from a version number.
+ *
+ * @return {number}  1 if {@code left} is higher.
+ *                   0 if arguments are equal.
+ *                  -1 if {@code right} is higher.
+ * @private
+ */
+goog.string.compareElements_ = function(left, right) {
+  if (left < right) {
+    return -1;
+  } else if (left > right) {
+    return 1;
+  }
+  return 0;
+};
+
+
+/**
+ * String hash function similar to java.lang.String.hashCode().
+ * The hash code for a string is computed as
+ * s[0] * 31 ^ (n - 1) + s[1] * 31 ^ (n - 2) + ... + s[n - 1],
+ * where s[i] is the ith character of the string and n is the length of
+ * the string. We mod the result to make it between 0 (inclusive) and 2^32
+ * (exclusive).
+ * @param {string} str A string.
+ * @return {number} Hash value for {@code str}, between 0 (inclusive) and 2^32
+ *  (exclusive). The empty string returns 0.
+ */
+goog.string.hashCode = function(str) {
+  var result = 0;
+  for (var i = 0; i < str.length; ++i) {
+    // Normalize to 4 byte range, 0 ... 2^32.
+    result = (31 * result + str.charCodeAt(i)) >>> 0;
+  }
+  return result;
+};
+
+
+/**
+ * The most recent unique ID. |0 is equivalent to Math.floor in this case.
+ * @type {number}
+ * @private
+ */
+goog.string.uniqueStringCounter_ = Math.random() * 0x80000000 | 0;
+
+
+/**
+ * Generates and returns a string which is unique in the current document.
+ * This is useful, for example, to create unique IDs for DOM elements.
+ * @return {string} A unique id.
+ */
+goog.string.createUniqueString = function() {
+  return 'goog_' + goog.string.uniqueStringCounter_++;
+};
+
+
+/**
+ * Converts the supplied string to a number, which may be Infinity or NaN.
+ * This function strips whitespace: (toNumber(' 123') === 123)
+ * This function accepts scientific notation: (toNumber('1e1') === 10)
+ *
+ * This is better than Javascript's built-in conversions because, sadly:
+ *     (Number(' ') === 0) and (parseFloat('123a') === 123)
+ *
+ * @param {string} str The string to convert.
+ * @return {number} The number the supplied string represents, or NaN.
+ */
+goog.string.toNumber = function(str) {
+  var num = Number(str);
+  if (num == 0 && goog.string.isEmptyOrWhitespace(str)) {
+    return NaN;
+  }
+  return num;
+};
+
+
+/**
+ * Returns whether the given string is lower camel case (e.g. "isFooBar").
+ *
+ * Note that this assumes the string is entirely letters.
+ * @see http://en.wikipedia.org/wiki/CamelCase#Variations_and_synonyms
+ *
+ * @param {string} str String to test.
+ * @return {boolean} Whether the string is lower camel case.
+ */
+goog.string.isLowerCamelCase = function(str) {
+  return /^[a-z]+([A-Z][a-z]*)*$/.test(str);
+};
+
+
+/**
+ * Returns whether the given string is upper camel case (e.g. "FooBarBaz").
+ *
+ * Note that this assumes the string is entirely letters.
+ * @see http://en.wikipedia.org/wiki/CamelCase#Variations_and_synonyms
+ *
+ * @param {string} str String to test.
+ * @return {boolean} Whether the string is upper camel case.
+ */
+goog.string.isUpperCamelCase = function(str) {
+  return /^([A-Z][a-z]*)+$/.test(str);
+};
+
+
+/**
+ * Converts a string from selector-case to camelCase (e.g. from
+ * "multi-part-string" to "multiPartString"), useful for converting
+ * CSS selectors and HTML dataset keys to their equivalent JS properties.
+ * @param {string} str The string in selector-case form.
+ * @return {string} The string in camelCase form.
+ */
+goog.string.toCamelCase = function(str) {
+  return String(str).replace(/\-([a-z])/g, function(all, match) {
+    return match.toUpperCase();
+  });
+};
+
+
+/**
+ * Converts a string from camelCase to selector-case (e.g. from
+ * "multiPartString" to "multi-part-string"), useful for converting JS
+ * style and dataset properties to equivalent CSS selectors and HTML keys.
+ * @param {string} str The string in camelCase form.
+ * @return {string} The string in selector-case form.
+ */
+goog.string.toSelectorCase = function(str) {
+  return String(str).replace(/([A-Z])/g, '-$1').toLowerCase();
+};
+
+
+/**
+ * Converts a string into TitleCase. First character of the string is always
+ * capitalized in addition to the first letter of every subsequent word.
+ * Words are delimited by one or more whitespaces by default. Custom delimiters
+ * can optionally be specified to replace the default, which doesn't preserve
+ * whitespace delimiters and instead must be explicitly included if needed.
+ *
+ * Default delimiter => " ":
+ *    goog.string.toTitleCase('oneTwoThree')    => 'OneTwoThree'
+ *    goog.string.toTitleCase('one two three')  => 'One Two Three'
+ *    goog.string.toTitleCase('  one   two   ') => '  One   Two   '
+ *    goog.string.toTitleCase('one_two_three')  => 'One_two_three'
+ *    goog.string.toTitleCase('one-two-three')  => 'One-two-three'
+ *
+ * Custom delimiter => "_-.":
+ *    goog.string.toTitleCase('oneTwoThree', '_-.')       => 'OneTwoThree'
+ *    goog.string.toTitleCase('one two three', '_-.')     => 'One two three'
+ *    goog.string.toTitleCase('  one   two   ', '_-.')    => '  one   two   '
+ *    goog.string.toTitleCase('one_two_three', '_-.')     => 'One_Two_Three'
+ *    goog.string.toTitleCase('one-two-three', '_-.')     => 'One-Two-Three'
+ *    goog.string.toTitleCase('one...two...three', '_-.') => 'One...Two...Three'
+ *    goog.string.toTitleCase('one. two. three', '_-.')   => 'One. two. three'
+ *    goog.string.toTitleCase('one-two.three', '_-.')     => 'One-Two.Three'
+ *
+ * @param {string} str String value in camelCase form.
+ * @param {string=} opt_delimiters Custom delimiter character set used to
+ *      distinguish words in the string value. Each character represents a
+ *      single delimiter. When provided, default whitespace delimiter is
+ *      overridden and must be explicitly included if needed.
+ * @return {string} String value in TitleCase form.
+ */
+goog.string.toTitleCase = function(str, opt_delimiters) {
+  var delimiters = goog.isString(opt_delimiters) ?
+      goog.string.regExpEscape(opt_delimiters) : '\\s';
+
+  // For IE8, we need to prevent using an empty character set. Otherwise,
+  // incorrect matching will occur.
+  delimiters = delimiters ? '|[' + delimiters + ']+' : '';
+
+  var regexp = new RegExp('(^' + delimiters + ')([a-z])', 'g');
+  return str.replace(regexp, function(all, p1, p2) {
+    return p1 + p2.toUpperCase();
+  });
+};
+
+
+/**
+ * Capitalizes a string, i.e. converts the first letter to uppercase
+ * and all other letters to lowercase, e.g.:
+ *
+ * goog.string.capitalize('one')     => 'One'
+ * goog.string.capitalize('ONE')     => 'One'
+ * goog.string.capitalize('one two') => 'One two'
+ *
+ * Note that this function does not trim initial whitespace.
+ *
+ * @param {string} str String value to capitalize.
+ * @return {string} String value with first letter in uppercase.
+ */
+goog.string.capitalize = function(str) {
+  return String(str.charAt(0)).toUpperCase() +
+      String(str.substr(1)).toLowerCase();
+};
+
+
+/**
+ * Parse a string in decimal or hexidecimal ('0xFFFF') form.
+ *
+ * To parse a particular radix, please use parseInt(string, radix) directly. See
+ * https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/parseInt
+ *
+ * This is a wrapper for the built-in parseInt function that will only parse
+ * numbers as base 10 or base 16.  Some JS implementations assume strings
+ * starting with "0" are intended to be octal. ES3 allowed but discouraged
+ * this behavior. ES5 forbids it.  This function emulates the ES5 behavior.
+ *
+ * For more information, see Mozilla JS Reference: http://goo.gl/8RiFj
+ *
+ * @param {string|number|null|undefined} value The value to be parsed.
+ * @return {number} The number, parsed. If the string failed to parse, this
+ *     will be NaN.
+ */
+goog.string.parseInt = function(value) {
+  // Force finite numbers to strings.
+  if (isFinite(value)) {
+    value = String(value);
+  }
+
+  if (goog.isString(value)) {
+    // If the string starts with '0x' or '-0x', parse as hex.
+    return /^\s*-?0x/i.test(value) ?
+        parseInt(value, 16) : parseInt(value, 10);
+  }
+
+  return NaN;
+};
+
+
+/**
+ * Splits a string on a separator a limited number of times.
+ *
+ * This implementation is more similar to Python or Java, where the limit
+ * parameter specifies the maximum number of splits rather than truncating
+ * the number of results.
+ *
+ * See http://docs.python.org/2/library/stdtypes.html#str.split
+ * See JavaDoc: http://goo.gl/F2AsY
+ * See Mozilla reference: http://goo.gl/dZdZs
+ *
+ * @param {string} str String to split.
+ * @param {string} separator The separator.
+ * @param {number} limit The limit to the number of splits. The resulting array
+ *     will have a maximum length of limit+1.  Negative numbers are the same
+ *     as zero.
+ * @return {!Array<string>} The string, split.
+ */
+
+goog.string.splitLimit = function(str, separator, limit) {
+  var parts = str.split(separator);
+  var returnVal = [];
+
+  // Only continue doing this while we haven't hit the limit and we have
+  // parts left.
+  while (limit > 0 && parts.length) {
+    returnVal.push(parts.shift());
+    limit--;
+  }
+
+  // If there are remaining parts, append them to the end.
+  if (parts.length) {
+    returnVal.push(parts.join(separator));
+  }
+
+  return returnVal;
+};
+
+
+/**
+ * Computes the Levenshtein edit distance between two strings.
+ * @param {string} a
+ * @param {string} b
+ * @return {number} The edit distance between the two strings.
+ */
+goog.string.editDistance = function(a, b) {
+  var v0 = [];
+  var v1 = [];
+
+  if (a == b) {
+    return 0;
+  }
+
+  if (!a.length || !b.length) {
+    return Math.max(a.length, b.length);
+  }
+
+  for (var i = 0; i < b.length + 1; i++) {
+    v0[i] = i;
+  }
+
+  for (var i = 0; i < a.length; i++) {
+    v1[0] = i + 1;
+
+    for (var j = 0; j < b.length; j++) {
+      var cost = a[i] != b[j];
+      // Cost for the substring is the minimum of adding one character, removing
+      // one character, or a swap.
+      v1[j + 1] = Math.min(v1[j] + 1, v0[j + 1] + 1, v0[j] + cost);
+    }
+
+    for (var j = 0; j < v0.length; j++) {
+      v0[j] = v1[j];
+    }
+  }
+
+  return v1[b.length];
+};
+
+// Copyright 2008 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Utilities to check the preconditions, postconditions and
+ * invariants runtime.
+ *
+ * Methods in this package should be given special treatment by the compiler
+ * for type-inference. For example, <code>goog.asserts.assert(foo)</code>
+ * will restrict <code>foo</code> to a truthy value.
+ *
+ * The compiler has an option to disable asserts. So code like:
+ * <code>
+ * var x = goog.asserts.assert(foo()); goog.asserts.assert(bar());
+ * </code>
+ * will be transformed into:
+ * <code>
+ * var x = foo();
+ * </code>
+ * The compiler will leave in foo() (because its return value is used),
+ * but it will remove bar() because it assumes it does not have side-effects.
+ *
+ * @author agrieve@google.com (Andrew Grieve)
+ */
+
+goog.provide('goog.asserts');
+goog.provide('goog.asserts.AssertionError');
+
+goog.require('goog.debug.Error');
+goog.require('goog.dom.NodeType');
+goog.require('goog.string');
+
+
+/**
+ * @define {boolean} Whether to strip out asserts or to leave them in.
+ */
+goog.define('goog.asserts.ENABLE_ASSERTS', goog.DEBUG);
+
+
+
+/**
+ * Error object for failed assertions.
+ * @param {string} messagePattern The pattern that was used to form message.
+ * @param {!Array<*>} messageArgs The items to substitute into the pattern.
+ * @constructor
+ * @extends {goog.debug.Error}
+ * @final
+ */
+goog.asserts.AssertionError = function(messagePattern, messageArgs) {
+  messageArgs.unshift(messagePattern);
+  goog.debug.Error.call(this, goog.string.subs.apply(null, messageArgs));
+  // Remove the messagePattern afterwards to avoid permanently modifying the
+  // passed in array.
+  messageArgs.shift();
+
+  /**
+   * The message pattern used to format the error message. Error handlers can
+   * use this to uniquely identify the assertion.
+   * @type {string}
+   */
+  this.messagePattern = messagePattern;
+};
+goog.inherits(goog.asserts.AssertionError, goog.debug.Error);
+
+
+/** @override */
+goog.asserts.AssertionError.prototype.name = 'AssertionError';
+
+
+/**
+ * The default error handler.
+ * @param {!goog.asserts.AssertionError} e The exception to be handled.
+ */
+goog.asserts.DEFAULT_ERROR_HANDLER = function(e) { throw e; };
+
+
+/**
+ * The handler responsible for throwing or logging assertion errors.
+ * @private {function(!goog.asserts.AssertionError)}
+ */
+goog.asserts.errorHandler_ = goog.asserts.DEFAULT_ERROR_HANDLER;
+
+
+/**
+ * Throws an exception with the given message and "Assertion failed" prefixed
+ * onto it.
+ * @param {string} defaultMessage The message to use if givenMessage is empty.
+ * @param {Array<*>} defaultArgs The substitution arguments for defaultMessage.
+ * @param {string|undefined} givenMessage Message supplied by the caller.
+ * @param {Array<*>} givenArgs The substitution arguments for givenMessage.
+ * @throws {goog.asserts.AssertionError} When the value is not a number.
+ * @private
+ */
+goog.asserts.doAssertFailure_ =
+    function(defaultMessage, defaultArgs, givenMessage, givenArgs) {
+  var message = 'Assertion failed';
+  if (givenMessage) {
+    message += ': ' + givenMessage;
+    var args = givenArgs;
+  } else if (defaultMessage) {
+    message += ': ' + defaultMessage;
+    args = defaultArgs;
+  }
+  // The '' + works around an Opera 10 bug in the unit tests. Without it,
+  // a stack trace is added to var message above. With this, a stack trace is
+  // not added until this line (it causes the extra garbage to be added after
+  // the assertion message instead of in the middle of it).
+  var e = new goog.asserts.AssertionError('' + message, args || []);
+  goog.asserts.errorHandler_(e);
+};
+
+
+/**
+ * Sets a custom error handler that can be used to customize the behavior of
+ * assertion failures, for example by turning all assertion failures into log
+ * messages.
+ * @param {function(!goog.asserts.AssertionError)} errorHandler
+ */
+goog.asserts.setErrorHandler = function(errorHandler) {
+  if (goog.asserts.ENABLE_ASSERTS) {
+    goog.asserts.errorHandler_ = errorHandler;
+  }
+};
+
+
+/**
+ * Checks if the condition evaluates to true if goog.asserts.ENABLE_ASSERTS is
+ * true.
+ * @template T
+ * @param {T} condition The condition to check.
+ * @param {string=} opt_message Error message in case of failure.
+ * @param {...*} var_args The items to substitute into the failure message.
+ * @return {T} The value of the condition.
+ * @throws {goog.asserts.AssertionError} When the condition evaluates to false.
+ */
+goog.asserts.assert = function(condition, opt_message, var_args) {
+  if (goog.asserts.ENABLE_ASSERTS && !condition) {
+    goog.asserts.doAssertFailure_('', null, opt_message,
+        Array.prototype.slice.call(arguments, 2));
+  }
+  return condition;
+};
+
+
+/**
+ * Fails if goog.asserts.ENABLE_ASSERTS is true. This function is useful in case
+ * when we want to add a check in the unreachable area like switch-case
+ * statement:
+ *
+ * <pre>
+ *  switch(type) {
+ *    case FOO: doSomething(); break;
+ *    case BAR: doSomethingElse(); break;
+ *    default: goog.assert.fail('Unrecognized type: ' + type);
+ *      // We have only 2 types - "default:" section is unreachable code.
+ *  }
+ * </pre>
+ *
+ * @param {string=} opt_message Error message in case of failure.
+ * @param {...*} var_args The items to substitute into the failure message.
+ * @throws {goog.asserts.AssertionError} Failure.
+ */
+goog.asserts.fail = function(opt_message, var_args) {
+  if (goog.asserts.ENABLE_ASSERTS) {
+    goog.asserts.errorHandler_(new goog.asserts.AssertionError(
+        'Failure' + (opt_message ? ': ' + opt_message : ''),
+        Array.prototype.slice.call(arguments, 1)));
+  }
+};
+
+
+/**
+ * Checks if the value is a number if goog.asserts.ENABLE_ASSERTS is true.
+ * @param {*} value The value to check.
+ * @param {string=} opt_message Error message in case of failure.
+ * @param {...*} var_args The items to substitute into the failure message.
+ * @return {number} The value, guaranteed to be a number when asserts enabled.
+ * @throws {goog.asserts.AssertionError} When the value is not a number.
+ */
+goog.asserts.assertNumber = function(value, opt_message, var_args) {
+  if (goog.asserts.ENABLE_ASSERTS && !goog.isNumber(value)) {
+    goog.asserts.doAssertFailure_('Expected number but got %s: %s.',
+        [goog.typeOf(value), value], opt_message,
+        Array.prototype.slice.call(arguments, 2));
+  }
+  return /** @type {number} */ (value);
+};
+
+
+/**
+ * Checks if the value is a string if goog.asserts.ENABLE_ASSERTS is true.
+ * @param {*} value The value to check.
+ * @param {string=} opt_message Error message in case of failure.
+ * @param {...*} var_args The items to substitute into the failure message.
+ * @return {string} The value, guaranteed to be a string when asserts enabled.
+ * @throws {goog.asserts.AssertionError} When the value is not a string.
+ */
+goog.asserts.assertString = function(value, opt_message, var_args) {
+  if (goog.asserts.ENABLE_ASSERTS && !goog.isString(value)) {
+    goog.asserts.doAssertFailure_('Expected string but got %s: %s.',
+        [goog.typeOf(value), value], opt_message,
+        Array.prototype.slice.call(arguments, 2));
+  }
+  return /** @type {string} */ (value);
+};
+
+
+/**
+ * Checks if the value is a function if goog.asserts.ENABLE_ASSERTS is true.
+ * @param {*} value The value to check.
+ * @param {string=} opt_message Error message in case of failure.
+ * @param {...*} var_args The items to substitute into the failure message.
+ * @return {!Function} The value, guaranteed to be a function when asserts
+ *     enabled.
+ * @throws {goog.asserts.AssertionError} When the value is not a function.
+ */
+goog.asserts.assertFunction = function(value, opt_message, var_args) {
+  if (goog.asserts.ENABLE_ASSERTS && !goog.isFunction(value)) {
+    goog.asserts.doAssertFailure_('Expected function but got %s: %s.',
+        [goog.typeOf(value), value], opt_message,
+        Array.prototype.slice.call(arguments, 2));
+  }
+  return /** @type {!Function} */ (value);
+};
+
+
+/**
+ * Checks if the value is an Object if goog.asserts.ENABLE_ASSERTS is true.
+ * @param {*} value The value to check.
+ * @param {string=} opt_message Error message in case of failure.
+ * @param {...*} var_args The items to substitute into the failure message.
+ * @return {!Object} The value, guaranteed to be a non-null object.
+ * @throws {goog.asserts.AssertionError} When the value is not an object.
+ */
+goog.asserts.assertObject = function(value, opt_message, var_args) {
+  if (goog.asserts.ENABLE_ASSERTS && !goog.isObject(value)) {
+    goog.asserts.doAssertFailure_('Expected object but got %s: %s.',
+        [goog.typeOf(value), value],
+        opt_message, Array.prototype.slice.call(arguments, 2));
+  }
+  return /** @type {!Object} */ (value);
+};
+
+
+/**
+ * Checks if the value is an Array if goog.asserts.ENABLE_ASSERTS is true.
+ * @param {*} value The value to check.
+ * @param {string=} opt_message Error message in case of failure.
+ * @param {...*} var_args The items to substitute into the failure message.
+ * @return {!Array<?>} The value, guaranteed to be a non-null array.
+ * @throws {goog.asserts.AssertionError} When the value is not an array.
+ */
+goog.asserts.assertArray = function(value, opt_message, var_args) {
+  if (goog.asserts.ENABLE_ASSERTS && !goog.isArray(value)) {
+    goog.asserts.doAssertFailure_('Expected array but got %s: %s.',
+        [goog.typeOf(value), value], opt_message,
+        Array.prototype.slice.call(arguments, 2));
+  }
+  return /** @type {!Array<?>} */ (value);
+};
+
+
+/**
+ * Checks if the value is a boolean if goog.asserts.ENABLE_ASSERTS is true.
+ * @param {*} value The value to check.
+ * @param {string=} opt_message Error message in case of failure.
+ * @param {...*} var_args The items to substitute into the failure message.
+ * @return {boolean} The value, guaranteed to be a boolean when asserts are
+ *     enabled.
+ * @throws {goog.asserts.AssertionError} When the value is not a boolean.
+ */
+goog.asserts.assertBoolean = function(value, opt_message, var_args) {
+  if (goog.asserts.ENABLE_ASSERTS && !goog.isBoolean(value)) {
+    goog.asserts.doAssertFailure_('Expected boolean but got %s: %s.',
+        [goog.typeOf(value), value], opt_message,
+        Array.prototype.slice.call(arguments, 2));
+  }
+  return /** @type {boolean} */ (value);
+};
+
+
+/**
+ * Checks if the value is a DOM Element if goog.asserts.ENABLE_ASSERTS is true.
+ * @param {*} value The value to check.
+ * @param {string=} opt_message Error message in case of failure.
+ * @param {...*} var_args The items to substitute into the failure message.
+ * @return {!Element} The value, likely to be a DOM Element when asserts are
+ *     enabled.
+ * @throws {goog.asserts.AssertionError} When the value is not an Element.
+ */
+goog.asserts.assertElement = function(value, opt_message, var_args) {
+  if (goog.asserts.ENABLE_ASSERTS && (!goog.isObject(value) ||
+      value.nodeType != goog.dom.NodeType.ELEMENT)) {
+    goog.asserts.doAssertFailure_('Expected Element but got %s: %s.',
+        [goog.typeOf(value), value], opt_message,
+        Array.prototype.slice.call(arguments, 2));
+  }
+  return /** @type {!Element} */ (value);
+};
+
+
+/**
+ * Checks if the value is an instance of the user-defined type if
+ * goog.asserts.ENABLE_ASSERTS is true.
+ *
+ * The compiler may tighten the type returned by this function.
+ *
+ * @param {*} value The value to check.
+ * @param {function(new: T, ...)} type A user-defined constructor.
+ * @param {string=} opt_message Error message in case of failure.
+ * @param {...*} var_args The items to substitute into the failure message.
+ * @throws {goog.asserts.AssertionError} When the value is not an instance of
+ *     type.
+ * @return {T}
+ * @template T
+ */
+goog.asserts.assertInstanceof = function(value, type, opt_message, var_args) {
+  if (goog.asserts.ENABLE_ASSERTS && !(value instanceof type)) {
+    goog.asserts.doAssertFailure_('Expected instanceof %s but got %s.',
+        [goog.asserts.getType_(type), goog.asserts.getType_(value)],
+        opt_message, Array.prototype.slice.call(arguments, 3));
+  }
+  return value;
+};
+
+
+/**
+ * Checks that no enumerable keys are present in Object.prototype. Such keys
+ * would break most code that use {@code for (var ... in ...)} loops.
+ */
+goog.asserts.assertObjectPrototypeIsIntact = function() {
+  for (var key in Object.prototype) {
+    goog.asserts.fail(key + ' should not be enumerable in Object.prototype.');
+  }
+};
+
+
+/**
+ * Returns the type of a value. If a constructor is passed, and a suitable
+ * string cannot be found, 'unknown type name' will be returned.
+ * @param {*} value A constructor, object, or primitive.
+ * @return {string} The best display name for the value, or 'unknown type name'.
+ * @private
+ */
+goog.asserts.getType_ = function(value) {
+  if (value instanceof Function) {
+    return value.displayName || value.name || 'unknown type name';
+  } else if (value instanceof Object) {
+    return value.constructor.displayName || value.constructor.name ||
+        Object.prototype.toString.call(value);
+  } else {
+    return value === null ? 'null' : typeof value;
+  }
+};
+
+goog.provide('ol.math');
+
+goog.require('goog.asserts');
+
+
+/**
+ * Takes a number and clamps it to within the provided bounds.
+ * @param {number} value The input number.
+ * @param {number} min The minimum value to return.
+ * @param {number} max The maximum value to return.
+ * @return {number} The input number if it is within bounds, or the nearest
+ *     number within the bounds.
+ */
+ol.math.clamp = function(value, min, max) {
+  return Math.min(Math.max(value, min), max);
+};
+
+
+/**
+ * Return the hyperbolic cosine of a given number. The method will use the
+ * native `Math.cosh` function if it is available, otherwise the hyperbolic
+ * cosine will be calculated via the reference implementation of the Mozilla
+ * developer network.
+ *
+ * @param {number} x X.
+ * @return {number} Hyperbolic cosine of x.
+ */
+ol.math.cosh = (function() {
+  // Wrapped in a iife, to save the overhead of checking for the native
+  // implementation on every invocation.
+  var cosh;
+  if ('cosh' in Math) {
+    // The environment supports the native Math.cosh function, use it…
+    cosh = Math.cosh;
+  } else {
+    // … else, use the reference implementation of MDN:
+    cosh = function(x) {
+      var y = Math.exp(x);
+      return (y + 1 / y) / 2;
+    };
+  }
+  return cosh;
+}());
+
+
+/**
+ * @param {number} x X.
+ * @return {number} The smallest power of two greater than or equal to x.
+ */
+ol.math.roundUpToPowerOfTwo = function(x) {
+  goog.asserts.assert(0 < x, 'x should be larger than 0');
+  return Math.pow(2, Math.ceil(Math.log(x) / Math.LN2));
+};
+
+
+/**
+ * Returns the square of the closest distance between the point (x, y) and the
+ * line segment (x1, y1) to (x2, y2).
+ * @param {number} x X.
+ * @param {number} y Y.
+ * @param {number} x1 X1.
+ * @param {number} y1 Y1.
+ * @param {number} x2 X2.
+ * @param {number} y2 Y2.
+ * @return {number} Squared distance.
+ */
+ol.math.squaredSegmentDistance = function(x, y, x1, y1, x2, y2) {
+  var dx = x2 - x1;
+  var dy = y2 - y1;
+  if (dx !== 0 || dy !== 0) {
+    var t = ((x - x1) * dx + (y - y1) * dy) / (dx * dx + dy * dy);
+    if (t > 1) {
+      x1 = x2;
+      y1 = y2;
+    } else if (t > 0) {
+      x1 += dx * t;
+      y1 += dy * t;
+    }
+  }
+  return ol.math.squaredDistance(x, y, x1, y1);
+};
+
+
+/**
+ * Returns the square of the distance between the points (x1, y1) and (x2, y2).
+ * @param {number} x1 X1.
+ * @param {number} y1 Y1.
+ * @param {number} x2 X2.
+ * @param {number} y2 Y2.
+ * @return {number} Squared distance.
+ */
+ol.math.squaredDistance = function(x1, y1, x2, y2) {
+  var dx = x2 - x1;
+  var dy = y2 - y1;
+  return dx * dx + dy * dy;
+};
+
+
+/**
+ * Solves system of linear equations using Gaussian elimination method.
+ *
+ * @param {Array.<Array.<number>>} mat Augmented matrix (n x n + 1 column)
+ *                                     in row-major order.
+ * @return {Array.<number>} The resulting vector.
+ */
+ol.math.solveLinearSystem = function(mat) {
+  var n = mat.length;
+
+  if (goog.asserts.ENABLE_ASSERTS) {
+    for (var row = 0; row < n; row++) {
+      goog.asserts.assert(mat[row].length == n + 1,
+                          'every row should have correct number of columns');
+    }
+  }
+
+  for (var i = 0; i < n; i++) {
+    // Find max in the i-th column (ignoring i - 1 first rows)
+    var maxRow = i;
+    var maxEl = Math.abs(mat[i][i]);
+    for (var r = i + 1; r < n; r++) {
+      var absValue = Math.abs(mat[r][i]);
+      if (absValue > maxEl) {
+        maxEl = absValue;
+        maxRow = r;
+      }
+    }
+
+    if (maxEl === 0) {
+      return null; // matrix is singular
+    }
+
+    // Swap max row with i-th (current) row
+    var tmp = mat[maxRow];
+    mat[maxRow] = mat[i];
+    mat[i] = tmp;
+
+    // Subtract the i-th row to make all the remaining rows 0 in the i-th column
+    for (var j = i + 1; j < n; j++) {
+      var coef = -mat[j][i] / mat[i][i];
+      for (var k = i; k < n + 1; k++) {
+        if (i == k) {
+          mat[j][k] = 0;
+        } else {
+          mat[j][k] += coef * mat[i][k];
+        }
+      }
+    }
+  }
+
+  // Solve Ax=b for upper triangular matrix A (mat)
+  var x = new Array(n);
+  for (var l = n - 1; l >= 0; l--) {
+    x[l] = mat[l][n] / mat[l][l];
+    for (var m = l - 1; m >= 0; m--) {
+      mat[m][n] -= mat[m][l] * x[l];
+    }
+  }
+  return x;
+};
+
+
+/**
+ * Converts radians to to degrees.
+ *
+ * @param {number} angleInRadians Angle in radians.
+ * @return {number} Angle in degrees.
+ */
+ol.math.toDegrees = function(angleInRadians) {
+  return angleInRadians * 180 / Math.PI;
+};
+
+
+/**
+ * Converts degrees to radians.
+ *
+ * @param {number} angleInDegrees Angle in degrees.
+ * @return {number} Angle in radians.
+ */
+ol.math.toRadians = function(angleInDegrees) {
+  return angleInDegrees * Math.PI / 180;
+};
+
+goog.provide('ol.CenterConstraint');
+goog.provide('ol.CenterConstraintType');
+
+goog.require('ol.math');
+
+
+/**
+ * @typedef {function((ol.Coordinate|undefined)): (ol.Coordinate|undefined)}
+ */
+ol.CenterConstraintType;
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @return {ol.CenterConstraintType}
+ */
+ol.CenterConstraint.createExtent = function(extent) {
+  return (
+      /**
+       * @param {ol.Coordinate|undefined} center Center.
+       * @return {ol.Coordinate|undefined} Center.
+       */
+      function(center) {
+        if (center) {
+          return [
+            ol.math.clamp(center[0], extent[0], extent[2]),
+            ol.math.clamp(center[1], extent[1], extent[3])
+          ];
+        } else {
+          return undefined;
+        }
+      });
+};
+
+
+/**
+ * @param {ol.Coordinate|undefined} center Center.
+ * @return {ol.Coordinate|undefined} Center.
+ */
+ol.CenterConstraint.none = function(center) {
+  return center;
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Utilities for manipulating arrays.
+ *
+ * @author arv@google.com (Erik Arvidsson)
+ */
+
+
+goog.provide('goog.array');
+goog.provide('goog.array.ArrayLike');
+
+goog.require('goog.asserts');
+
+
+/**
+ * @define {boolean} NATIVE_ARRAY_PROTOTYPES indicates whether the code should
+ * rely on Array.prototype functions, if available.
+ *
+ * The Array.prototype functions can be defined by external libraries like
+ * Prototype and setting this flag to false forces closure to use its own
+ * goog.array implementation.
+ *
+ * If your javascript can be loaded by a third party site and you are wary about
+ * relying on the prototype functions, specify
+ * "--define goog.NATIVE_ARRAY_PROTOTYPES=false" to the JSCompiler.
+ *
+ * Setting goog.TRUSTED_SITE to false will automatically set
+ * NATIVE_ARRAY_PROTOTYPES to false.
+ */
+goog.define('goog.NATIVE_ARRAY_PROTOTYPES', goog.TRUSTED_SITE);
+
+
+/**
+ * @define {boolean} If true, JSCompiler will use the native implementation of
+ * array functions where appropriate (e.g., {@code Array#filter}) and remove the
+ * unused pure JS implementation.
+ */
+goog.define('goog.array.ASSUME_NATIVE_FUNCTIONS', false);
+
+
+/**
+ * @typedef {Array|NodeList|Arguments|{length: number}}
+ */
+goog.array.ArrayLike;
+
+
+/**
+ * Returns the last element in an array without removing it.
+ * Same as goog.array.last.
+ * @param {Array<T>|goog.array.ArrayLike} array The array.
+ * @return {T} Last item in array.
+ * @template T
+ */
+goog.array.peek = function(array) {
+  return array[array.length - 1];
+};
+
+
+/**
+ * Returns the last element in an array without removing it.
+ * Same as goog.array.peek.
+ * @param {Array<T>|goog.array.ArrayLike} array The array.
+ * @return {T} Last item in array.
+ * @template T
+ */
+goog.array.last = goog.array.peek;
+
+
+/**
+ * Reference to the original {@code Array.prototype}.
+ * @private
+ */
+goog.array.ARRAY_PROTOTYPE_ = Array.prototype;
+
+
+// NOTE(arv): Since most of the array functions are generic it allows you to
+// pass an array-like object. Strings have a length and are considered array-
+// like. However, the 'in' operator does not work on strings so we cannot just
+// use the array path even if the browser supports indexing into strings. We
+// therefore end up splitting the string.
+
+
+/**
+ * Returns the index of the first element of an array with a specified value, or
+ * -1 if the element is not present in the array.
+ *
+ * See {@link http://tinyurl.com/developer-mozilla-org-array-indexof}
+ *
+ * @param {Array<T>|goog.array.ArrayLike} arr The array to be searched.
+ * @param {T} obj The object for which we are searching.
+ * @param {number=} opt_fromIndex The index at which to start the search. If
+ *     omitted the search starts at index 0.
+ * @return {number} The index of the first matching array element.
+ * @template T
+ */
+goog.array.indexOf = goog.NATIVE_ARRAY_PROTOTYPES &&
+                     (goog.array.ASSUME_NATIVE_FUNCTIONS ||
+                      goog.array.ARRAY_PROTOTYPE_.indexOf) ?
+    function(arr, obj, opt_fromIndex) {
+      goog.asserts.assert(arr.length != null);
+
+      return goog.array.ARRAY_PROTOTYPE_.indexOf.call(arr, obj, opt_fromIndex);
+    } :
+    function(arr, obj, opt_fromIndex) {
+      var fromIndex = opt_fromIndex == null ?
+          0 : (opt_fromIndex < 0 ?
+               Math.max(0, arr.length + opt_fromIndex) : opt_fromIndex);
+
+      if (goog.isString(arr)) {
+        // Array.prototype.indexOf uses === so only strings should be found.
+        if (!goog.isString(obj) || obj.length != 1) {
+          return -1;
+        }
+        return arr.indexOf(obj, fromIndex);
+      }
+
+      for (var i = fromIndex; i < arr.length; i++) {
+        if (i in arr && arr[i] === obj)
+          return i;
+      }
+      return -1;
+    };
+
+
+/**
+ * Returns the index of the last element of an array with a specified value, or
+ * -1 if the element is not present in the array.
+ *
+ * See {@link http://tinyurl.com/developer-mozilla-org-array-lastindexof}
+ *
+ * @param {!Array<T>|!goog.array.ArrayLike} arr The array to be searched.
+ * @param {T} obj The object for which we are searching.
+ * @param {?number=} opt_fromIndex The index at which to start the search. If
+ *     omitted the search starts at the end of the array.
+ * @return {number} The index of the last matching array element.
+ * @template T
+ */
+goog.array.lastIndexOf = goog.NATIVE_ARRAY_PROTOTYPES &&
+                         (goog.array.ASSUME_NATIVE_FUNCTIONS ||
+                          goog.array.ARRAY_PROTOTYPE_.lastIndexOf) ?
+    function(arr, obj, opt_fromIndex) {
+      goog.asserts.assert(arr.length != null);
+
+      // Firefox treats undefined and null as 0 in the fromIndex argument which
+      // leads it to always return -1
+      var fromIndex = opt_fromIndex == null ? arr.length - 1 : opt_fromIndex;
+      return goog.array.ARRAY_PROTOTYPE_.lastIndexOf.call(arr, obj, fromIndex);
+    } :
+    function(arr, obj, opt_fromIndex) {
+      var fromIndex = opt_fromIndex == null ? arr.length - 1 : opt_fromIndex;
+
+      if (fromIndex < 0) {
+        fromIndex = Math.max(0, arr.length + fromIndex);
+      }
+
+      if (goog.isString(arr)) {
+        // Array.prototype.lastIndexOf uses === so only strings should be found.
+        if (!goog.isString(obj) || obj.length != 1) {
+          return -1;
+        }
+        return arr.lastIndexOf(obj, fromIndex);
+      }
+
+      for (var i = fromIndex; i >= 0; i--) {
+        if (i in arr && arr[i] === obj)
+          return i;
+      }
+      return -1;
+    };
+
+
+/**
+ * Calls a function for each element in an array. Skips holes in the array.
+ * See {@link http://tinyurl.com/developer-mozilla-org-array-foreach}
+ *
+ * @param {Array<T>|goog.array.ArrayLike} arr Array or array like object over
+ *     which to iterate.
+ * @param {?function(this: S, T, number, ?): ?} f The function to call for every
+ *     element. This function takes 3 arguments (the element, the index and the
+ *     array). The return value is ignored.
+ * @param {S=} opt_obj The object to be used as the value of 'this' within f.
+ * @template T,S
+ */
+goog.array.forEach = goog.NATIVE_ARRAY_PROTOTYPES &&
+                     (goog.array.ASSUME_NATIVE_FUNCTIONS ||
+                      goog.array.ARRAY_PROTOTYPE_.forEach) ?
+    function(arr, f, opt_obj) {
+      goog.asserts.assert(arr.length != null);
+
+      goog.array.ARRAY_PROTOTYPE_.forEach.call(arr, f, opt_obj);
+    } :
+    function(arr, f, opt_obj) {
+      var l = arr.length;  // must be fixed during loop... see docs
+      var arr2 = goog.isString(arr) ? arr.split('') : arr;
+      for (var i = 0; i < l; i++) {
+        if (i in arr2) {
+          f.call(opt_obj, arr2[i], i, arr);
+        }
+      }
+    };
+
+
+/**
+ * Calls a function for each element in an array, starting from the last
+ * element rather than the first.
+ *
+ * @param {Array<T>|goog.array.ArrayLike} arr Array or array
+ *     like object over which to iterate.
+ * @param {?function(this: S, T, number, ?): ?} f The function to call for every
+ *     element. This function
+ *     takes 3 arguments (the element, the index and the array). The return
+ *     value is ignored.
+ * @param {S=} opt_obj The object to be used as the value of 'this'
+ *     within f.
+ * @template T,S
+ */
+goog.array.forEachRight = function(arr, f, opt_obj) {
+  var l = arr.length;  // must be fixed during loop... see docs
+  var arr2 = goog.isString(arr) ? arr.split('') : arr;
+  for (var i = l - 1; i >= 0; --i) {
+    if (i in arr2) {
+      f.call(opt_obj, arr2[i], i, arr);
+    }
+  }
+};
+
+
+/**
+ * Calls a function for each element in an array, and if the function returns
+ * true adds the element to a new array.
+ *
+ * See {@link http://tinyurl.com/developer-mozilla-org-array-filter}
+ *
+ * @param {Array<T>|goog.array.ArrayLike} arr Array or array
+ *     like object over which to iterate.
+ * @param {?function(this:S, T, number, ?):boolean} f The function to call for
+ *     every element. This function
+ *     takes 3 arguments (the element, the index and the array) and must
+ *     return a Boolean. If the return value is true the element is added to the
+ *     result array. If it is false the element is not included.
+ * @param {S=} opt_obj The object to be used as the value of 'this'
+ *     within f.
+ * @return {!Array<T>} a new array in which only elements that passed the test
+ *     are present.
+ * @template T,S
+ */
+goog.array.filter = goog.NATIVE_ARRAY_PROTOTYPES &&
+                    (goog.array.ASSUME_NATIVE_FUNCTIONS ||
+                     goog.array.ARRAY_PROTOTYPE_.filter) ?
+    function(arr, f, opt_obj) {
+      goog.asserts.assert(arr.length != null);
+
+      return goog.array.ARRAY_PROTOTYPE_.filter.call(arr, f, opt_obj);
+    } :
+    function(arr, f, opt_obj) {
+      var l = arr.length;  // must be fixed during loop... see docs
+      var res = [];
+      var resLength = 0;
+      var arr2 = goog.isString(arr) ? arr.split('') : arr;
+      for (var i = 0; i < l; i++) {
+        if (i in arr2) {
+          var val = arr2[i];  // in case f mutates arr2
+          if (f.call(opt_obj, val, i, arr)) {
+            res[resLength++] = val;
+          }
+        }
+      }
+      return res;
+    };
+
+
+/**
+ * Calls a function for each element in an array and inserts the result into a
+ * new array.
+ *
+ * See {@link http://tinyurl.com/developer-mozilla-org-array-map}
+ *
+ * @param {Array<VALUE>|goog.array.ArrayLike} arr Array or array like object
+ *     over which to iterate.
+ * @param {function(this:THIS, VALUE, number, ?): RESULT} f The function to call
+ *     for every element. This function takes 3 arguments (the element,
+ *     the index and the array) and should return something. The result will be
+ *     inserted into a new array.
+ * @param {THIS=} opt_obj The object to be used as the value of 'this' within f.
+ * @return {!Array<RESULT>} a new array with the results from f.
+ * @template THIS, VALUE, RESULT
+ */
+goog.array.map = goog.NATIVE_ARRAY_PROTOTYPES &&
+                 (goog.array.ASSUME_NATIVE_FUNCTIONS ||
+                  goog.array.ARRAY_PROTOTYPE_.map) ?
+    function(arr, f, opt_obj) {
+      goog.asserts.assert(arr.length != null);
+
+      return goog.array.ARRAY_PROTOTYPE_.map.call(arr, f, opt_obj);
+    } :
+    function(arr, f, opt_obj) {
+      var l = arr.length;  // must be fixed during loop... see docs
+      var res = new Array(l);
+      var arr2 = goog.isString(arr) ? arr.split('') : arr;
+      for (var i = 0; i < l; i++) {
+        if (i in arr2) {
+          res[i] = f.call(opt_obj, arr2[i], i, arr);
+        }
+      }
+      return res;
+    };
+
+
+/**
+ * Passes every element of an array into a function and accumulates the result.
+ *
+ * See {@link http://tinyurl.com/developer-mozilla-org-array-reduce}
+ *
+ * For example:
+ * var a = [1, 2, 3, 4];
+ * goog.array.reduce(a, function(r, v, i, arr) {return r + v;}, 0);
+ * returns 10
+ *
+ * @param {Array<T>|goog.array.ArrayLike} arr Array or array
+ *     like object over which to iterate.
+ * @param {function(this:S, R, T, number, ?) : R} f The function to call for
+ *     every element. This function
+ *     takes 4 arguments (the function's previous result or the initial value,
+ *     the value of the current array element, the current array index, and the
+ *     array itself)
+ *     function(previousValue, currentValue, index, array).
+ * @param {?} val The initial value to pass into the function on the first call.
+ * @param {S=} opt_obj  The object to be used as the value of 'this'
+ *     within f.
+ * @return {R} Result of evaluating f repeatedly across the values of the array.
+ * @template T,S,R
+ */
+goog.array.reduce = goog.NATIVE_ARRAY_PROTOTYPES &&
+                    (goog.array.ASSUME_NATIVE_FUNCTIONS ||
+                     goog.array.ARRAY_PROTOTYPE_.reduce) ?
+    function(arr, f, val, opt_obj) {
+      goog.asserts.assert(arr.length != null);
+      if (opt_obj) {
+        f = goog.bind(f, opt_obj);
+      }
+      return goog.array.ARRAY_PROTOTYPE_.reduce.call(arr, f, val);
+    } :
+    function(arr, f, val, opt_obj) {
+      var rval = val;
+      goog.array.forEach(arr, function(val, index) {
+        rval = f.call(opt_obj, rval, val, index, arr);
+      });
+      return rval;
+    };
+
+
+/**
+ * Passes every element of an array into a function and accumulates the result,
+ * starting from the last element and working towards the first.
+ *
+ * See {@link http://tinyurl.com/developer-mozilla-org-array-reduceright}
+ *
+ * For example:
+ * var a = ['a', 'b', 'c'];
+ * goog.array.reduceRight(a, function(r, v, i, arr) {return r + v;}, '');
+ * returns 'cba'
+ *
+ * @param {Array<T>|goog.array.ArrayLike} arr Array or array
+ *     like object over which to iterate.
+ * @param {?function(this:S, R, T, number, ?) : R} f The function to call for
+ *     every element. This function
+ *     takes 4 arguments (the function's previous result or the initial value,
+ *     the value of the current array element, the current array index, and the
+ *     array itself)
+ *     function(previousValue, currentValue, index, array).
+ * @param {?} val The initial value to pass into the function on the first call.
+ * @param {S=} opt_obj The object to be used as the value of 'this'
+ *     within f.
+ * @return {R} Object returned as a result of evaluating f repeatedly across the
+ *     values of the array.
+ * @template T,S,R
+ */
+goog.array.reduceRight = goog.NATIVE_ARRAY_PROTOTYPES &&
+                         (goog.array.ASSUME_NATIVE_FUNCTIONS ||
+                          goog.array.ARRAY_PROTOTYPE_.reduceRight) ?
+    function(arr, f, val, opt_obj) {
+      goog.asserts.assert(arr.length != null);
+      if (opt_obj) {
+        f = goog.bind(f, opt_obj);
+      }
+      return goog.array.ARRAY_PROTOTYPE_.reduceRight.call(arr, f, val);
+    } :
+    function(arr, f, val, opt_obj) {
+      var rval = val;
+      goog.array.forEachRight(arr, function(val, index) {
+        rval = f.call(opt_obj, rval, val, index, arr);
+      });
+      return rval;
+    };
+
+
+/**
+ * Calls f for each element of an array. If any call returns true, some()
+ * returns true (without checking the remaining elements). If all calls
+ * return false, some() returns false.
+ *
+ * See {@link http://tinyurl.com/developer-mozilla-org-array-some}
+ *
+ * @param {Array<T>|goog.array.ArrayLike} arr Array or array
+ *     like object over which to iterate.
+ * @param {?function(this:S, T, number, ?) : boolean} f The function to call for
+ *     for every element. This function takes 3 arguments (the element, the
+ *     index and the array) and should return a boolean.
+ * @param {S=} opt_obj  The object to be used as the value of 'this'
+ *     within f.
+ * @return {boolean} true if any element passes the test.
+ * @template T,S
+ */
+goog.array.some = goog.NATIVE_ARRAY_PROTOTYPES &&
+                  (goog.array.ASSUME_NATIVE_FUNCTIONS ||
+                   goog.array.ARRAY_PROTOTYPE_.some) ?
+    function(arr, f, opt_obj) {
+      goog.asserts.assert(arr.length != null);
+
+      return goog.array.ARRAY_PROTOTYPE_.some.call(arr, f, opt_obj);
+    } :
+    function(arr, f, opt_obj) {
+      var l = arr.length;  // must be fixed during loop... see docs
+      var arr2 = goog.isString(arr) ? arr.split('') : arr;
+      for (var i = 0; i < l; i++) {
+        if (i in arr2 && f.call(opt_obj, arr2[i], i, arr)) {
+          return true;
+        }
+      }
+      return false;
+    };
+
+
+/**
+ * Call f for each element of an array. If all calls return true, every()
+ * returns true. If any call returns false, every() returns false and
+ * does not continue to check the remaining elements.
+ *
+ * See {@link http://tinyurl.com/developer-mozilla-org-array-every}
+ *
+ * @param {Array<T>|goog.array.ArrayLike} arr Array or array
+ *     like object over which to iterate.
+ * @param {?function(this:S, T, number, ?) : boolean} f The function to call for
+ *     for every element. This function takes 3 arguments (the element, the
+ *     index and the array) and should return a boolean.
+ * @param {S=} opt_obj The object to be used as the value of 'this'
+ *     within f.
+ * @return {boolean} false if any element fails the test.
+ * @template T,S
+ */
+goog.array.every = goog.NATIVE_ARRAY_PROTOTYPES &&
+                   (goog.array.ASSUME_NATIVE_FUNCTIONS ||
+                    goog.array.ARRAY_PROTOTYPE_.every) ?
+    function(arr, f, opt_obj) {
+      goog.asserts.assert(arr.length != null);
+
+      return goog.array.ARRAY_PROTOTYPE_.every.call(arr, f, opt_obj);
+    } :
+    function(arr, f, opt_obj) {
+      var l = arr.length;  // must be fixed during loop... see docs
+      var arr2 = goog.isString(arr) ? arr.split('') : arr;
+      for (var i = 0; i < l; i++) {
+        if (i in arr2 && !f.call(opt_obj, arr2[i], i, arr)) {
+          return false;
+        }
+      }
+      return true;
+    };
+
+
+/**
+ * Counts the array elements that fulfill the predicate, i.e. for which the
+ * callback function returns true. Skips holes in the array.
+ *
+ * @param {!(Array<T>|goog.array.ArrayLike)} arr Array or array like object
+ *     over which to iterate.
+ * @param {function(this: S, T, number, ?): boolean} f The function to call for
+ *     every element. Takes 3 arguments (the element, the index and the array).
+ * @param {S=} opt_obj The object to be used as the value of 'this' within f.
+ * @return {number} The number of the matching elements.
+ * @template T,S
+ */
+goog.array.count = function(arr, f, opt_obj) {
+  var count = 0;
+  goog.array.forEach(arr, function(element, index, arr) {
+    if (f.call(opt_obj, element, index, arr)) {
+      ++count;
+    }
+  }, opt_obj);
+  return count;
+};
+
+
+/**
+ * Search an array for the first element that satisfies a given condition and
+ * return that element.
+ * @param {Array<T>|goog.array.ArrayLike} arr Array or array
+ *     like object over which to iterate.
+ * @param {?function(this:S, T, number, ?) : boolean} f The function to call
+ *     for every element. This function takes 3 arguments (the element, the
+ *     index and the array) and should return a boolean.
+ * @param {S=} opt_obj An optional "this" context for the function.
+ * @return {T|null} The first array element that passes the test, or null if no
+ *     element is found.
+ * @template T,S
+ */
+goog.array.find = function(arr, f, opt_obj) {
+  var i = goog.array.findIndex(arr, f, opt_obj);
+  return i < 0 ? null : goog.isString(arr) ? arr.charAt(i) : arr[i];
+};
+
+
+/**
+ * Search an array for the first element that satisfies a given condition and
+ * return its index.
+ * @param {Array<T>|goog.array.ArrayLike} arr Array or array
+ *     like object over which to iterate.
+ * @param {?function(this:S, T, number, ?) : boolean} f The function to call for
+ *     every element. This function
+ *     takes 3 arguments (the element, the index and the array) and should
+ *     return a boolean.
+ * @param {S=} opt_obj An optional "this" context for the function.
+ * @return {number} The index of the first array element that passes the test,
+ *     or -1 if no element is found.
+ * @template T,S
+ */
+goog.array.findIndex = function(arr, f, opt_obj) {
+  var l = arr.length;  // must be fixed during loop... see docs
+  var arr2 = goog.isString(arr) ? arr.split('') : arr;
+  for (var i = 0; i < l; i++) {
+    if (i in arr2 && f.call(opt_obj, arr2[i], i, arr)) {
+      return i;
+    }
+  }
+  return -1;
+};
+
+
+/**
+ * Search an array (in reverse order) for the last element that satisfies a
+ * given condition and return that element.
+ * @param {Array<T>|goog.array.ArrayLike} arr Array or array
+ *     like object over which to iterate.
+ * @param {?function(this:S, T, number, ?) : boolean} f The function to call
+ *     for every element. This function
+ *     takes 3 arguments (the element, the index and the array) and should
+ *     return a boolean.
+ * @param {S=} opt_obj An optional "this" context for the function.
+ * @return {T|null} The last array element that passes the test, or null if no
+ *     element is found.
+ * @template T,S
+ */
+goog.array.findRight = function(arr, f, opt_obj) {
+  var i = goog.array.findIndexRight(arr, f, opt_obj);
+  return i < 0 ? null : goog.isString(arr) ? arr.charAt(i) : arr[i];
+};
+
+
+/**
+ * Search an array (in reverse order) for the last element that satisfies a
+ * given condition and return its index.
+ * @param {Array<T>|goog.array.ArrayLike} arr Array or array
+ *     like object over which to iterate.
+ * @param {?function(this:S, T, number, ?) : boolean} f The function to call
+ *     for every element. This function
+ *     takes 3 arguments (the element, the index and the array) and should
+ *     return a boolean.
+ * @param {S=} opt_obj An optional "this" context for the function.
+ * @return {number} The index of the last array element that passes the test,
+ *     or -1 if no element is found.
+ * @template T,S
+ */
+goog.array.findIndexRight = function(arr, f, opt_obj) {
+  var l = arr.length;  // must be fixed during loop... see docs
+  var arr2 = goog.isString(arr) ? arr.split('') : arr;
+  for (var i = l - 1; i >= 0; i--) {
+    if (i in arr2 && f.call(opt_obj, arr2[i], i, arr)) {
+      return i;
+    }
+  }
+  return -1;
+};
+
+
+/**
+ * Whether the array contains the given object.
+ * @param {goog.array.ArrayLike} arr The array to test for the presence of the
+ *     element.
+ * @param {*} obj The object for which to test.
+ * @return {boolean} true if obj is present.
+ */
+goog.array.contains = function(arr, obj) {
+  return goog.array.indexOf(arr, obj) >= 0;
+};
+
+
+/**
+ * Whether the array is empty.
+ * @param {goog.array.ArrayLike} arr The array to test.
+ * @return {boolean} true if empty.
+ */
+goog.array.isEmpty = function(arr) {
+  return arr.length == 0;
+};
+
+
+/**
+ * Clears the array.
+ * @param {goog.array.ArrayLike} arr Array or array like object to clear.
+ */
+goog.array.clear = function(arr) {
+  // For non real arrays we don't have the magic length so we delete the
+  // indices.
+  if (!goog.isArray(arr)) {
+    for (var i = arr.length - 1; i >= 0; i--) {
+      delete arr[i];
+    }
+  }
+  arr.length = 0;
+};
+
+
+/**
+ * Pushes an item into an array, if it's not already in the array.
+ * @param {Array<T>} arr Array into which to insert the item.
+ * @param {T} obj Value to add.
+ * @template T
+ */
+goog.array.insert = function(arr, obj) {
+  if (!goog.array.contains(arr, obj)) {
+    arr.push(obj);
+  }
+};
+
+
+/**
+ * Inserts an object at the given index of the array.
+ * @param {goog.array.ArrayLike} arr The array to modify.
+ * @param {*} obj The object to insert.
+ * @param {number=} opt_i The index at which to insert the object. If omitted,
+ *      treated as 0. A negative index is counted from the end of the array.
+ */
+goog.array.insertAt = function(arr, obj, opt_i) {
+  goog.array.splice(arr, opt_i, 0, obj);
+};
+
+
+/**
+ * Inserts at the given index of the array, all elements of another array.
+ * @param {goog.array.ArrayLike} arr The array to modify.
+ * @param {goog.array.ArrayLike} elementsToAdd The array of elements to add.
+ * @param {number=} opt_i The index at which to insert the object. If omitted,
+ *      treated as 0. A negative index is counted from the end of the array.
+ */
+goog.array.insertArrayAt = function(arr, elementsToAdd, opt_i) {
+  goog.partial(goog.array.splice, arr, opt_i, 0).apply(null, elementsToAdd);
+};
+
+
+/**
+ * Inserts an object into an array before a specified object.
+ * @param {Array<T>} arr The array to modify.
+ * @param {T} obj The object to insert.
+ * @param {T=} opt_obj2 The object before which obj should be inserted. If obj2
+ *     is omitted or not found, obj is inserted at the end of the array.
+ * @template T
+ */
+goog.array.insertBefore = function(arr, obj, opt_obj2) {
+  var i;
+  if (arguments.length == 2 || (i = goog.array.indexOf(arr, opt_obj2)) < 0) {
+    arr.push(obj);
+  } else {
+    goog.array.insertAt(arr, obj, i);
+  }
+};
+
+
+/**
+ * Removes the first occurrence of a particular value from an array.
+ * @param {Array<T>|goog.array.ArrayLike} arr Array from which to remove
+ *     value.
+ * @param {T} obj Object to remove.
+ * @return {boolean} True if an element was removed.
+ * @template T
+ */
+goog.array.remove = function(arr, obj) {
+  var i = goog.array.indexOf(arr, obj);
+  var rv;
+  if ((rv = i >= 0)) {
+    goog.array.removeAt(arr, i);
+  }
+  return rv;
+};
+
+
+/**
+ * Removes from an array the element at index i
+ * @param {goog.array.ArrayLike} arr Array or array like object from which to
+ *     remove value.
+ * @param {number} i The index to remove.
+ * @return {boolean} True if an element was removed.
+ */
+goog.array.removeAt = function(arr, i) {
+  goog.asserts.assert(arr.length != null);
+
+  // use generic form of splice
+  // splice returns the removed items and if successful the length of that
+  // will be 1
+  return goog.array.ARRAY_PROTOTYPE_.splice.call(arr, i, 1).length == 1;
+};
+
+
+/**
+ * Removes the first value that satisfies the given condition.
+ * @param {Array<T>|goog.array.ArrayLike} arr Array or array
+ *     like object over which to iterate.
+ * @param {?function(this:S, T, number, ?) : boolean} f The function to call
+ *     for every element. This function
+ *     takes 3 arguments (the element, the index and the array) and should
+ *     return a boolean.
+ * @param {S=} opt_obj An optional "this" context for the function.
+ * @return {boolean} True if an element was removed.
+ * @template T,S
+ */
+goog.array.removeIf = function(arr, f, opt_obj) {
+  var i = goog.array.findIndex(arr, f, opt_obj);
+  if (i >= 0) {
+    goog.array.removeAt(arr, i);
+    return true;
+  }
+  return false;
+};
+
+
+/**
+ * Removes all values that satisfy the given condition.
+ * @param {Array<T>|goog.array.ArrayLike} arr Array or array
+ *     like object over which to iterate.
+ * @param {?function(this:S, T, number, ?) : boolean} f The function to call
+ *     for every element. This function
+ *     takes 3 arguments (the element, the index and the array) and should
+ *     return a boolean.
+ * @param {S=} opt_obj An optional "this" context for the function.
+ * @return {number} The number of items removed
+ * @template T,S
+ */
+goog.array.removeAllIf = function(arr, f, opt_obj) {
+  var removedCount = 0;
+  goog.array.forEachRight(arr, function(val, index) {
+    if (f.call(opt_obj, val, index, arr)) {
+      if (goog.array.removeAt(arr, index)) {
+        removedCount++;
+      }
+    }
+  });
+  return removedCount;
+};
+
+
+/**
+ * Returns a new array that is the result of joining the arguments.  If arrays
+ * are passed then their items are added, however, if non-arrays are passed they
+ * will be added to the return array as is.
+ *
+ * Note that ArrayLike objects will be added as is, rather than having their
+ * items added.
+ *
+ * goog.array.concat([1, 2], [3, 4]) -> [1, 2, 3, 4]
+ * goog.array.concat(0, [1, 2]) -> [0, 1, 2]
+ * goog.array.concat([1, 2], null) -> [1, 2, null]
+ *
+ * There is bug in all current versions of IE (6, 7 and 8) where arrays created
+ * in an iframe become corrupted soon (not immediately) after the iframe is
+ * destroyed. This is common if loading data via goog.net.IframeIo, for example.
+ * This corruption only affects the concat method which will start throwing
+ * Catastrophic Errors (#-2147418113).
+ *
+ * See http://endoflow.com/scratch/corrupted-arrays.html for a test case.
+ *
+ * Internally goog.array should use this, so that all methods will continue to
+ * work on these broken array objects.
+ *
+ * @param {...*} var_args Items to concatenate.  Arrays will have each item
+ *     added, while primitives and objects will be added as is.
+ * @return {!Array<?>} The new resultant array.
+ */
+goog.array.concat = function(var_args) {
+  return goog.array.ARRAY_PROTOTYPE_.concat.apply(
+      goog.array.ARRAY_PROTOTYPE_, arguments);
+};
+
+
+/**
+ * Returns a new array that contains the contents of all the arrays passed.
+ * @param {...!Array<T>} var_args
+ * @return {!Array<T>}
+ * @template T
+ */
+goog.array.join = function(var_args) {
+  return goog.array.ARRAY_PROTOTYPE_.concat.apply(
+      goog.array.ARRAY_PROTOTYPE_, arguments);
+};
+
+
+/**
+ * Converts an object to an array.
+ * @param {Array<T>|goog.array.ArrayLike} object  The object to convert to an
+ *     array.
+ * @return {!Array<T>} The object converted into an array. If object has a
+ *     length property, every property indexed with a non-negative number
+ *     less than length will be included in the result. If object does not
+ *     have a length property, an empty array will be returned.
+ * @template T
+ */
+goog.array.toArray = function(object) {
+  var length = object.length;
+
+  // If length is not a number the following it false. This case is kept for
+  // backwards compatibility since there are callers that pass objects that are
+  // not array like.
+  if (length > 0) {
+    var rv = new Array(length);
+    for (var i = 0; i < length; i++) {
+      rv[i] = object[i];
+    }
+    return rv;
+  }
+  return [];
+};
+
+
+/**
+ * Does a shallow copy of an array.
+ * @param {Array<T>|goog.array.ArrayLike} arr  Array or array-like object to
+ *     clone.
+ * @return {!Array<T>} Clone of the input array.
+ * @template T
+ */
+goog.array.clone = goog.array.toArray;
+
+
+/**
+ * Extends an array with another array, element, or "array like" object.
+ * This function operates 'in-place', it does not create a new Array.
+ *
+ * Example:
+ * var a = [];
+ * goog.array.extend(a, [0, 1]);
+ * a; // [0, 1]
+ * goog.array.extend(a, 2);
+ * a; // [0, 1, 2]
+ *
+ * @param {Array<VALUE>} arr1  The array to modify.
+ * @param {...(Array<VALUE>|VALUE)} var_args The elements or arrays of elements
+ *     to add to arr1.
+ * @template VALUE
+ */
+goog.array.extend = function(arr1, var_args) {
+  for (var i = 1; i < arguments.length; i++) {
+    var arr2 = arguments[i];
+    if (goog.isArrayLike(arr2)) {
+      var len1 = arr1.length || 0;
+      var len2 = arr2.length || 0;
+      arr1.length = len1 + len2;
+      for (var j = 0; j < len2; j++) {
+        arr1[len1 + j] = arr2[j];
+      }
+    } else {
+      arr1.push(arr2);
+    }
+  }
+};
+
+
+/**
+ * Adds or removes elements from an array. This is a generic version of Array
+ * splice. This means that it might work on other objects similar to arrays,
+ * such as the arguments object.
+ *
+ * @param {Array<T>|goog.array.ArrayLike} arr The array to modify.
+ * @param {number|undefined} index The index at which to start changing the
+ *     array. If not defined, treated as 0.
+ * @param {number} howMany How many elements to remove (0 means no removal. A
+ *     value below 0 is treated as zero and so is any other non number. Numbers
+ *     are floored).
+ * @param {...T} var_args Optional, additional elements to insert into the
+ *     array.
+ * @return {!Array<T>} the removed elements.
+ * @template T
+ */
+goog.array.splice = function(arr, index, howMany, var_args) {
+  goog.asserts.assert(arr.length != null);
+
+  return goog.array.ARRAY_PROTOTYPE_.splice.apply(
+      arr, goog.array.slice(arguments, 1));
+};
+
+
+/**
+ * Returns a new array from a segment of an array. This is a generic version of
+ * Array slice. This means that it might work on other objects similar to
+ * arrays, such as the arguments object.
+ *
+ * @param {Array<T>|goog.array.ArrayLike} arr The array from
+ * which to copy a segment.
+ * @param {number} start The index of the first element to copy.
+ * @param {number=} opt_end The index after the last element to copy.
+ * @return {!Array<T>} A new array containing the specified segment of the
+ *     original array.
+ * @template T
+ */
+goog.array.slice = function(arr, start, opt_end) {
+  goog.asserts.assert(arr.length != null);
+
+  // passing 1 arg to slice is not the same as passing 2 where the second is
+  // null or undefined (in that case the second argument is treated as 0).
+  // we could use slice on the arguments object and then use apply instead of
+  // testing the length
+  if (arguments.length <= 2) {
+    return goog.array.ARRAY_PROTOTYPE_.slice.call(arr, start);
+  } else {
+    return goog.array.ARRAY_PROTOTYPE_.slice.call(arr, start, opt_end);
+  }
+};
+
+
+/**
+ * Removes all duplicates from an array (retaining only the first
+ * occurrence of each array element).  This function modifies the
+ * array in place and doesn't change the order of the non-duplicate items.
+ *
+ * For objects, duplicates are identified as having the same unique ID as
+ * defined by {@link goog.getUid}.
+ *
+ * Alternatively you can specify a custom hash function that returns a unique
+ * value for each item in the array it should consider unique.
+ *
+ * Runtime: N,
+ * Worstcase space: 2N (no dupes)
+ *
+ * @param {Array<T>|goog.array.ArrayLike} arr The array from which to remove
+ *     duplicates.
+ * @param {Array=} opt_rv An optional array in which to return the results,
+ *     instead of performing the removal inplace.  If specified, the original
+ *     array will remain unchanged.
+ * @param {function(T):string=} opt_hashFn An optional function to use to
+ *     apply to every item in the array. This function should return a unique
+ *     value for each item in the array it should consider unique.
+ * @template T
+ */
+goog.array.removeDuplicates = function(arr, opt_rv, opt_hashFn) {
+  var returnArray = opt_rv || arr;
+  var defaultHashFn = function(item) {
+    // Prefix each type with a single character representing the type to
+    // prevent conflicting keys (e.g. true and 'true').
+    return goog.isObject(item) ? 'o' + goog.getUid(item) :
+        (typeof item).charAt(0) + item;
+  };
+  var hashFn = opt_hashFn || defaultHashFn;
+
+  var seen = {}, cursorInsert = 0, cursorRead = 0;
+  while (cursorRead < arr.length) {
+    var current = arr[cursorRead++];
+    var key = hashFn(current);
+    if (!Object.prototype.hasOwnProperty.call(seen, key)) {
+      seen[key] = true;
+      returnArray[cursorInsert++] = current;
+    }
+  }
+  returnArray.length = cursorInsert;
+};
+
+
+/**
+ * Searches the specified array for the specified target using the binary
+ * search algorithm.  If no opt_compareFn is specified, elements are compared
+ * using <code>goog.array.defaultCompare</code>, which compares the elements
+ * using the built in < and > operators.  This will produce the expected
+ * behavior for homogeneous arrays of String(s) and Number(s). The array
+ * specified <b>must</b> be sorted in ascending order (as defined by the
+ * comparison function).  If the array is not sorted, results are undefined.
+ * If the array contains multiple instances of the specified target value, any
+ * of these instances may be found.
+ *
+ * Runtime: O(log n)
+ *
+ * @param {Array<VALUE>|goog.array.ArrayLike} arr The array to be searched.
+ * @param {TARGET} target The sought value.
+ * @param {function(TARGET, VALUE): number=} opt_compareFn Optional comparison
+ *     function by which the array is ordered. Should take 2 arguments to
+ *     compare, and return a negative number, zero, or a positive number
+ *     depending on whether the first argument is less than, equal to, or
+ *     greater than the second.
+ * @return {number} Lowest index of the target value if found, otherwise
+ *     (-(insertion point) - 1). The insertion point is where the value should
+ *     be inserted into arr to preserve the sorted property.  Return value >= 0
+ *     iff target is found.
+ * @template TARGET, VALUE
+ */
+goog.array.binarySearch = function(arr, target, opt_compareFn) {
+  return goog.array.binarySearch_(arr,
+      opt_compareFn || goog.array.defaultCompare, false /* isEvaluator */,
+      target);
+};
+
+
+/**
+ * Selects an index in the specified array using the binary search algorithm.
+ * The evaluator receives an element and determines whether the desired index
+ * is before, at, or after it.  The evaluator must be consistent (formally,
+ * goog.array.map(goog.array.map(arr, evaluator, opt_obj), goog.math.sign)
+ * must be monotonically non-increasing).
+ *
+ * Runtime: O(log n)
+ *
+ * @param {Array<VALUE>|goog.array.ArrayLike} arr The array to be searched.
+ * @param {function(this:THIS, VALUE, number, ?): number} evaluator
+ *     Evaluator function that receives 3 arguments (the element, the index and
+ *     the array). Should return a negative number, zero, or a positive number
+ *     depending on whether the desired index is before, at, or after the
+ *     element passed to it.
+ * @param {THIS=} opt_obj The object to be used as the value of 'this'
+ *     within evaluator.
+ * @return {number} Index of the leftmost element matched by the evaluator, if
+ *     such exists; otherwise (-(insertion point) - 1). The insertion point is
+ *     the index of the first element for which the evaluator returns negative,
+ *     or arr.length if no such element exists. The return value is non-negative
+ *     iff a match is found.
+ * @template THIS, VALUE
+ */
+goog.array.binarySelect = function(arr, evaluator, opt_obj) {
+  return goog.array.binarySearch_(arr, evaluator, true /* isEvaluator */,
+      undefined /* opt_target */, opt_obj);
+};
+
+
+/**
+ * Implementation of a binary search algorithm which knows how to use both
+ * comparison functions and evaluators. If an evaluator is provided, will call
+ * the evaluator with the given optional data object, conforming to the
+ * interface defined in binarySelect. Otherwise, if a comparison function is
+ * provided, will call the comparison function against the given data object.
+ *
+ * This implementation purposefully does not use goog.bind or goog.partial for
+ * performance reasons.
+ *
+ * Runtime: O(log n)
+ *
+ * @param {Array<VALUE>|goog.array.ArrayLike} arr The array to be searched.
+ * @param {function(TARGET, VALUE): number|
+ *         function(this:THIS, VALUE, number, ?): number} compareFn Either an
+ *     evaluator or a comparison function, as defined by binarySearch
+ *     and binarySelect above.
+ * @param {boolean} isEvaluator Whether the function is an evaluator or a
+ *     comparison function.
+ * @param {TARGET=} opt_target If the function is a comparison function, then
+ *     this is the target to binary search for.
+ * @param {THIS=} opt_selfObj If the function is an evaluator, this is an
+  *    optional this object for the evaluator.
+ * @return {number} Lowest index of the target value if found, otherwise
+ *     (-(insertion point) - 1). The insertion point is where the value should
+ *     be inserted into arr to preserve the sorted property.  Return value >= 0
+ *     iff target is found.
+ * @template THIS, VALUE, TARGET
+ * @private
+ */
+goog.array.binarySearch_ = function(arr, compareFn, isEvaluator, opt_target,
+    opt_selfObj) {
+  var left = 0;  // inclusive
+  var right = arr.length;  // exclusive
+  var found;
+  while (left < right) {
+    var middle = (left + right) >> 1;
+    var compareResult;
+    if (isEvaluator) {
+      compareResult = compareFn.call(opt_selfObj, arr[middle], middle, arr);
+    } else {
+      compareResult = compareFn(opt_target, arr[middle]);
+    }
+    if (compareResult > 0) {
+      left = middle + 1;
+    } else {
+      right = middle;
+      // We are looking for the lowest index so we can't return immediately.
+      found = !compareResult;
+    }
+  }
+  // left is the index if found, or the insertion point otherwise.
+  // ~left is a shorthand for -left - 1.
+  return found ? left : ~left;
+};
+
+
+/**
+ * Sorts the specified array into ascending order.  If no opt_compareFn is
+ * specified, elements are compared using
+ * <code>goog.array.defaultCompare</code>, which compares the elements using
+ * the built in < and > operators.  This will produce the expected behavior
+ * for homogeneous arrays of String(s) and Number(s), unlike the native sort,
+ * but will give unpredictable results for heterogenous lists of strings and
+ * numbers with different numbers of digits.
+ *
+ * This sort is not guaranteed to be stable.
+ *
+ * Runtime: Same as <code>Array.prototype.sort</code>
+ *
+ * @param {Array<T>} arr The array to be sorted.
+ * @param {?function(T,T):number=} opt_compareFn Optional comparison
+ *     function by which the
+ *     array is to be ordered. Should take 2 arguments to compare, and return a
+ *     negative number, zero, or a positive number depending on whether the
+ *     first argument is less than, equal to, or greater than the second.
+ * @template T
+ */
+goog.array.sort = function(arr, opt_compareFn) {
+  // TODO(arv): Update type annotation since null is not accepted.
+  arr.sort(opt_compareFn || goog.array.defaultCompare);
+};
+
+
+/**
+ * Sorts the specified array into ascending order in a stable way.  If no
+ * opt_compareFn is specified, elements are compared using
+ * <code>goog.array.defaultCompare</code>, which compares the elements using
+ * the built in < and > operators.  This will produce the expected behavior
+ * for homogeneous arrays of String(s) and Number(s).
+ *
+ * Runtime: Same as <code>Array.prototype.sort</code>, plus an additional
+ * O(n) overhead of copying the array twice.
+ *
+ * @param {Array<T>} arr The array to be sorted.
+ * @param {?function(T, T): number=} opt_compareFn Optional comparison function
+ *     by which the array is to be ordered. Should take 2 arguments to compare,
+ *     and return a negative number, zero, or a positive number depending on
+ *     whether the first argument is less than, equal to, or greater than the
+ *     second.
+ * @template T
+ */
+goog.array.stableSort = function(arr, opt_compareFn) {
+  for (var i = 0; i < arr.length; i++) {
+    arr[i] = {index: i, value: arr[i]};
+  }
+  var valueCompareFn = opt_compareFn || goog.array.defaultCompare;
+  function stableCompareFn(obj1, obj2) {
+    return valueCompareFn(obj1.value, obj2.value) || obj1.index - obj2.index;
+  };
+  goog.array.sort(arr, stableCompareFn);
+  for (var i = 0; i < arr.length; i++) {
+    arr[i] = arr[i].value;
+  }
+};
+
+
+/**
+ * Sort the specified array into ascending order based on item keys
+ * returned by the specified key function.
+ * If no opt_compareFn is specified, the keys are compared in ascending order
+ * using <code>goog.array.defaultCompare</code>.
+ *
+ * Runtime: O(S(f(n)), where S is runtime of <code>goog.array.sort</code>
+ * and f(n) is runtime of the key function.
+ *
+ * @param {Array<T>} arr The array to be sorted.
+ * @param {function(T): K} keyFn Function taking array element and returning
+ *     a key used for sorting this element.
+ * @param {?function(K, K): number=} opt_compareFn Optional comparison function
+ *     by which the keys are to be ordered. Should take 2 arguments to compare,
+ *     and return a negative number, zero, or a positive number depending on
+ *     whether the first argument is less than, equal to, or greater than the
+ *     second.
+ * @template T,K
+ */
+goog.array.sortByKey = function(arr, keyFn, opt_compareFn) {
+  var keyCompareFn = opt_compareFn || goog.array.defaultCompare;
+  goog.array.sort(arr, function(a, b) {
+    return keyCompareFn(keyFn(a), keyFn(b));
+  });
+};
+
+
+/**
+ * Sorts an array of objects by the specified object key and compare
+ * function. If no compare function is provided, the key values are
+ * compared in ascending order using <code>goog.array.defaultCompare</code>.
+ * This won't work for keys that get renamed by the compiler. So use
+ * {'foo': 1, 'bar': 2} rather than {foo: 1, bar: 2}.
+ * @param {Array<Object>} arr An array of objects to sort.
+ * @param {string} key The object key to sort by.
+ * @param {Function=} opt_compareFn The function to use to compare key
+ *     values.
+ */
+goog.array.sortObjectsByKey = function(arr, key, opt_compareFn) {
+  goog.array.sortByKey(arr,
+      function(obj) { return obj[key]; },
+      opt_compareFn);
+};
+
+
+/**
+ * Tells if the array is sorted.
+ * @param {!Array<T>} arr The array.
+ * @param {?function(T,T):number=} opt_compareFn Function to compare the
+ *     array elements.
+ *     Should take 2 arguments to compare, and return a negative number, zero,
+ *     or a positive number depending on whether the first argument is less
+ *     than, equal to, or greater than the second.
+ * @param {boolean=} opt_strict If true no equal elements are allowed.
+ * @return {boolean} Whether the array is sorted.
+ * @template T
+ */
+goog.array.isSorted = function(arr, opt_compareFn, opt_strict) {
+  var compare = opt_compareFn || goog.array.defaultCompare;
+  for (var i = 1; i < arr.length; i++) {
+    var compareResult = compare(arr[i - 1], arr[i]);
+    if (compareResult > 0 || compareResult == 0 && opt_strict) {
+      return false;
+    }
+  }
+  return true;
+};
+
+
+/**
+ * Compares two arrays for equality. Two arrays are considered equal if they
+ * have the same length and their corresponding elements are equal according to
+ * the comparison function.
+ *
+ * @param {goog.array.ArrayLike} arr1 The first array to compare.
+ * @param {goog.array.ArrayLike} arr2 The second array to compare.
+ * @param {Function=} opt_equalsFn Optional comparison function.
+ *     Should take 2 arguments to compare, and return true if the arguments
+ *     are equal. Defaults to {@link goog.array.defaultCompareEquality} which
+ *     compares the elements using the built-in '===' operator.
+ * @return {boolean} Whether the two arrays are equal.
+ */
+goog.array.equals = function(arr1, arr2, opt_equalsFn) {
+  if (!goog.isArrayLike(arr1) || !goog.isArrayLike(arr2) ||
+      arr1.length != arr2.length) {
+    return false;
+  }
+  var l = arr1.length;
+  var equalsFn = opt_equalsFn || goog.array.defaultCompareEquality;
+  for (var i = 0; i < l; i++) {
+    if (!equalsFn(arr1[i], arr2[i])) {
+      return false;
+    }
+  }
+  return true;
+};
+
+
+/**
+ * 3-way array compare function.
+ * @param {!Array<VALUE>|!goog.array.ArrayLike} arr1 The first array to
+ *     compare.
+ * @param {!Array<VALUE>|!goog.array.ArrayLike} arr2 The second array to
+ *     compare.
+ * @param {function(VALUE, VALUE): number=} opt_compareFn Optional comparison
+ *     function by which the array is to be ordered. Should take 2 arguments to
+ *     compare, and return a negative number, zero, or a positive number
+ *     depending on whether the first argument is less than, equal to, or
+ *     greater than the second.
+ * @return {number} Negative number, zero, or a positive number depending on
+ *     whether the first argument is less than, equal to, or greater than the
+ *     second.
+ * @template VALUE
+ */
+goog.array.compare3 = function(arr1, arr2, opt_compareFn) {
+  var compare = opt_compareFn || goog.array.defaultCompare;
+  var l = Math.min(arr1.length, arr2.length);
+  for (var i = 0; i < l; i++) {
+    var result = compare(arr1[i], arr2[i]);
+    if (result != 0) {
+      return result;
+    }
+  }
+  return goog.array.defaultCompare(arr1.length, arr2.length);
+};
+
+
+/**
+ * Compares its two arguments for order, using the built in < and >
+ * operators.
+ * @param {VALUE} a The first object to be compared.
+ * @param {VALUE} b The second object to be compared.
+ * @return {number} A negative number, zero, or a positive number as the first
+ *     argument is less than, equal to, or greater than the second,
+ *     respectively.
+ * @template VALUE
+ */
+goog.array.defaultCompare = function(a, b) {
+  return a > b ? 1 : a < b ? -1 : 0;
+};
+
+
+/**
+ * Compares its two arguments for inverse order, using the built in < and >
+ * operators.
+ * @param {VALUE} a The first object to be compared.
+ * @param {VALUE} b The second object to be compared.
+ * @return {number} A negative number, zero, or a positive number as the first
+ *     argument is greater than, equal to, or less than the second,
+ *     respectively.
+ * @template VALUE
+ */
+goog.array.inverseDefaultCompare = function(a, b) {
+  return -goog.array.defaultCompare(a, b);
+};
+
+
+/**
+ * Compares its two arguments for equality, using the built in === operator.
+ * @param {*} a The first object to compare.
+ * @param {*} b The second object to compare.
+ * @return {boolean} True if the two arguments are equal, false otherwise.
+ */
+goog.array.defaultCompareEquality = function(a, b) {
+  return a === b;
+};
+
+
+/**
+ * Inserts a value into a sorted array. The array is not modified if the
+ * value is already present.
+ * @param {Array<VALUE>|goog.array.ArrayLike} array The array to modify.
+ * @param {VALUE} value The object to insert.
+ * @param {function(VALUE, VALUE): number=} opt_compareFn Optional comparison
+ *     function by which the array is ordered. Should take 2 arguments to
+ *     compare, and return a negative number, zero, or a positive number
+ *     depending on whether the first argument is less than, equal to, or
+ *     greater than the second.
+ * @return {boolean} True if an element was inserted.
+ * @template VALUE
+ */
+goog.array.binaryInsert = function(array, value, opt_compareFn) {
+  var index = goog.array.binarySearch(array, value, opt_compareFn);
+  if (index < 0) {
+    goog.array.insertAt(array, value, -(index + 1));
+    return true;
+  }
+  return false;
+};
+
+
+/**
+ * Removes a value from a sorted array.
+ * @param {!Array<VALUE>|!goog.array.ArrayLike} array The array to modify.
+ * @param {VALUE} value The object to remove.
+ * @param {function(VALUE, VALUE): number=} opt_compareFn Optional comparison
+ *     function by which the array is ordered. Should take 2 arguments to
+ *     compare, and return a negative number, zero, or a positive number
+ *     depending on whether the first argument is less than, equal to, or
+ *     greater than the second.
+ * @return {boolean} True if an element was removed.
+ * @template VALUE
+ */
+goog.array.binaryRemove = function(array, value, opt_compareFn) {
+  var index = goog.array.binarySearch(array, value, opt_compareFn);
+  return (index >= 0) ? goog.array.removeAt(array, index) : false;
+};
+
+
+/**
+ * Splits an array into disjoint buckets according to a splitting function.
+ * @param {Array<T>} array The array.
+ * @param {function(this:S, T,number,Array<T>):?} sorter Function to call for
+ *     every element.  This takes 3 arguments (the element, the index and the
+ *     array) and must return a valid object key (a string, number, etc), or
+ *     undefined, if that object should not be placed in a bucket.
+ * @param {S=} opt_obj The object to be used as the value of 'this' within
+ *     sorter.
+ * @return {!Object} An object, with keys being all of the unique return values
+ *     of sorter, and values being arrays containing the items for
+ *     which the splitter returned that key.
+ * @template T,S
+ */
+goog.array.bucket = function(array, sorter, opt_obj) {
+  var buckets = {};
+
+  for (var i = 0; i < array.length; i++) {
+    var value = array[i];
+    var key = sorter.call(opt_obj, value, i, array);
+    if (goog.isDef(key)) {
+      // Push the value to the right bucket, creating it if necessary.
+      var bucket = buckets[key] || (buckets[key] = []);
+      bucket.push(value);
+    }
+  }
+
+  return buckets;
+};
+
+
+/**
+ * Creates a new object built from the provided array and the key-generation
+ * function.
+ * @param {Array<T>|goog.array.ArrayLike} arr Array or array like object over
+ *     which to iterate whose elements will be the values in the new object.
+ * @param {?function(this:S, T, number, ?) : string} keyFunc The function to
+ *     call for every element. This function takes 3 arguments (the element, the
+ *     index and the array) and should return a string that will be used as the
+ *     key for the element in the new object. If the function returns the same
+ *     key for more than one element, the value for that key is
+ *     implementation-defined.
+ * @param {S=} opt_obj The object to be used as the value of 'this'
+ *     within keyFunc.
+ * @return {!Object<T>} The new object.
+ * @template T,S
+ */
+goog.array.toObject = function(arr, keyFunc, opt_obj) {
+  var ret = {};
+  goog.array.forEach(arr, function(element, index) {
+    ret[keyFunc.call(opt_obj, element, index, arr)] = element;
+  });
+  return ret;
+};
+
+
+/**
+ * Creates a range of numbers in an arithmetic progression.
+ *
+ * Range takes 1, 2, or 3 arguments:
+ * <pre>
+ * range(5) is the same as range(0, 5, 1) and produces [0, 1, 2, 3, 4]
+ * range(2, 5) is the same as range(2, 5, 1) and produces [2, 3, 4]
+ * range(-2, -5, -1) produces [-2, -3, -4]
+ * range(-2, -5, 1) produces [], since stepping by 1 wouldn't ever reach -5.
+ * </pre>
+ *
+ * @param {number} startOrEnd The starting value of the range if an end argument
+ *     is provided. Otherwise, the start value is 0, and this is the end value.
+ * @param {number=} opt_end The optional end value of the range.
+ * @param {number=} opt_step The step size between range values. Defaults to 1
+ *     if opt_step is undefined or 0.
+ * @return {!Array<number>} An array of numbers for the requested range. May be
+ *     an empty array if adding the step would not converge toward the end
+ *     value.
+ */
+goog.array.range = function(startOrEnd, opt_end, opt_step) {
+  var array = [];
+  var start = 0;
+  var end = startOrEnd;
+  var step = opt_step || 1;
+  if (opt_end !== undefined) {
+    start = startOrEnd;
+    end = opt_end;
+  }
+
+  if (step * (end - start) < 0) {
+    // Sign mismatch: start + step will never reach the end value.
+    return [];
+  }
+
+  if (step > 0) {
+    for (var i = start; i < end; i += step) {
+      array.push(i);
+    }
+  } else {
+    for (var i = start; i > end; i += step) {
+      array.push(i);
+    }
+  }
+  return array;
+};
+
+
+/**
+ * Returns an array consisting of the given value repeated N times.
+ *
+ * @param {VALUE} value The value to repeat.
+ * @param {number} n The repeat count.
+ * @return {!Array<VALUE>} An array with the repeated value.
+ * @template VALUE
+ */
+goog.array.repeat = function(value, n) {
+  var array = [];
+  for (var i = 0; i < n; i++) {
+    array[i] = value;
+  }
+  return array;
+};
+
+
+/**
+ * Returns an array consisting of every argument with all arrays
+ * expanded in-place recursively.
+ *
+ * @param {...*} var_args The values to flatten.
+ * @return {!Array<?>} An array containing the flattened values.
+ */
+goog.array.flatten = function(var_args) {
+  var CHUNK_SIZE = 8192;
+
+  var result = [];
+  for (var i = 0; i < arguments.length; i++) {
+    var element = arguments[i];
+    if (goog.isArray(element)) {
+      for (var c = 0; c < element.length; c += CHUNK_SIZE) {
+        var chunk = goog.array.slice(element, c, c + CHUNK_SIZE);
+        var recurseResult = goog.array.flatten.apply(null, chunk);
+        for (var r = 0; r < recurseResult.length; r++) {
+          result.push(recurseResult[r]);
+        }
+      }
+    } else {
+      result.push(element);
+    }
+  }
+  return result;
+};
+
+
+/**
+ * Rotates an array in-place. After calling this method, the element at
+ * index i will be the element previously at index (i - n) %
+ * array.length, for all values of i between 0 and array.length - 1,
+ * inclusive.
+ *
+ * For example, suppose list comprises [t, a, n, k, s]. After invoking
+ * rotate(array, 1) (or rotate(array, -4)), array will comprise [s, t, a, n, k].
+ *
+ * @param {!Array<T>} array The array to rotate.
+ * @param {number} n The amount to rotate.
+ * @return {!Array<T>} The array.
+ * @template T
+ */
+goog.array.rotate = function(array, n) {
+  goog.asserts.assert(array.length != null);
+
+  if (array.length) {
+    n %= array.length;
+    if (n > 0) {
+      goog.array.ARRAY_PROTOTYPE_.unshift.apply(array, array.splice(-n, n));
+    } else if (n < 0) {
+      goog.array.ARRAY_PROTOTYPE_.push.apply(array, array.splice(0, -n));
+    }
+  }
+  return array;
+};
+
+
+/**
+ * Moves one item of an array to a new position keeping the order of the rest
+ * of the items. Example use case: keeping a list of JavaScript objects
+ * synchronized with the corresponding list of DOM elements after one of the
+ * elements has been dragged to a new position.
+ * @param {!(Array|Arguments|{length:number})} arr The array to modify.
+ * @param {number} fromIndex Index of the item to move between 0 and
+ *     {@code arr.length - 1}.
+ * @param {number} toIndex Target index between 0 and {@code arr.length - 1}.
+ */
+goog.array.moveItem = function(arr, fromIndex, toIndex) {
+  goog.asserts.assert(fromIndex >= 0 && fromIndex < arr.length);
+  goog.asserts.assert(toIndex >= 0 && toIndex < arr.length);
+  // Remove 1 item at fromIndex.
+  var removedItems = goog.array.ARRAY_PROTOTYPE_.splice.call(arr, fromIndex, 1);
+  // Insert the removed item at toIndex.
+  goog.array.ARRAY_PROTOTYPE_.splice.call(arr, toIndex, 0, removedItems[0]);
+  // We don't use goog.array.insertAt and goog.array.removeAt, because they're
+  // significantly slower than splice.
+};
+
+
+/**
+ * Creates a new array for which the element at position i is an array of the
+ * ith element of the provided arrays.  The returned array will only be as long
+ * as the shortest array provided; additional values are ignored.  For example,
+ * the result of zipping [1, 2] and [3, 4, 5] is [[1,3], [2, 4]].
+ *
+ * This is similar to the zip() function in Python.  See {@link
+ * http://docs.python.org/library/functions.html#zip}
+ *
+ * @param {...!goog.array.ArrayLike} var_args Arrays to be combined.
+ * @return {!Array<!Array<?>>} A new array of arrays created from
+ *     provided arrays.
+ */
+goog.array.zip = function(var_args) {
+  if (!arguments.length) {
+    return [];
+  }
+  var result = [];
+  for (var i = 0; true; i++) {
+    var value = [];
+    for (var j = 0; j < arguments.length; j++) {
+      var arr = arguments[j];
+      // If i is larger than the array length, this is the shortest array.
+      if (i >= arr.length) {
+        return result;
+      }
+      value.push(arr[i]);
+    }
+    result.push(value);
+  }
+};
+
+
+/**
+ * Shuffles the values in the specified array using the Fisher-Yates in-place
+ * shuffle (also known as the Knuth Shuffle). By default, calls Math.random()
+ * and so resets the state of that random number generator. Similarly, may reset
+ * the state of the any other specified random number generator.
+ *
+ * Runtime: O(n)
+ *
+ * @param {!Array<?>} arr The array to be shuffled.
+ * @param {function():number=} opt_randFn Optional random function to use for
+ *     shuffling.
+ *     Takes no arguments, and returns a random number on the interval [0, 1).
+ *     Defaults to Math.random() using JavaScript's built-in Math library.
+ */
+goog.array.shuffle = function(arr, opt_randFn) {
+  var randFn = opt_randFn || Math.random;
+
+  for (var i = arr.length - 1; i > 0; i--) {
+    // Choose a random array index in [0, i] (inclusive with i).
+    var j = Math.floor(randFn() * (i + 1));
+
+    var tmp = arr[i];
+    arr[i] = arr[j];
+    arr[j] = tmp;
+  }
+};
+
+
+/**
+ * Returns a new array of elements from arr, based on the indexes of elements
+ * provided by index_arr. For example, the result of index copying
+ * ['a', 'b', 'c'] with index_arr [1,0,0,2] is ['b', 'a', 'a', 'c'].
+ *
+ * @param {!Array<T>} arr The array to get a indexed copy from.
+ * @param {!Array<number>} index_arr An array of indexes to get from arr.
+ * @return {!Array<T>} A new array of elements from arr in index_arr order.
+ * @template T
+ */
+goog.array.copyByIndex = function(arr, index_arr) {
+  var result = [];
+  goog.array.forEach(index_arr, function(index) {
+    result.push(arr[index]);
+  });
+  return result;
+};
+
+goog.provide('ol.array');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+
+
+/**
+ * @param {Array.<number>} arr Array.
+ * @param {number} target Target.
+ * @return {number} Index.
+ */
+ol.array.binaryFindNearest = function(arr, target) {
+  var index = goog.array.binarySearch(arr, target,
+      /**
+       * @param {number} a A.
+       * @param {number} b B.
+       * @return {number} b minus a.
+       */
+      function(a, b) {
+        return b - a;
+      });
+  if (index >= 0) {
+    return index;
+  } else if (index == -1) {
+    return 0;
+  } else if (index == -arr.length - 1) {
+    return arr.length - 1;
+  } else {
+    var left = -index - 2;
+    var right = -index - 1;
+    if (arr[left] - target < target - arr[right]) {
+      return left;
+    } else {
+      return right;
+    }
+  }
+};
+
+
+/**
+ * Compare function for array sort that is safe for numbers.
+ * @param {*} a The first object to be compared.
+ * @param {*} b The second object to be compared.
+ * @return {number} A negative number, zero, or a positive number as the first
+ *     argument is less than, equal to, or greater than the second.
+ */
+ol.array.numberSafeCompareFunction = function(a, b) {
+  return a > b ? 1 : a < b ? -1 : 0;
+};
+
+
+/**
+ * Whether the array contains the given object.
+ * @param {Array.<*>} arr The array to test for the presence of the element.
+ * @param {*} obj The object for which to test.
+ * @return {boolean} The object is in the array.
+ */
+ol.array.includes = function(arr, obj) {
+  return arr.indexOf(obj) >= 0;
+};
+
+
+/**
+ * @param {Array.<number>} arr Array.
+ * @param {number} target Target.
+ * @param {number} direction 0 means return the nearest, > 0
+ *    means return the largest nearest, < 0 means return the
+ *    smallest nearest.
+ * @return {number} Index.
+ */
+ol.array.linearFindNearest = function(arr, target, direction) {
+  var n = arr.length;
+  if (arr[0] <= target) {
+    return 0;
+  } else if (target <= arr[n - 1]) {
+    return n - 1;
+  } else {
+    var i;
+    if (direction > 0) {
+      for (i = 1; i < n; ++i) {
+        if (arr[i] < target) {
+          return i - 1;
+        }
+      }
+    } else if (direction < 0) {
+      for (i = 1; i < n; ++i) {
+        if (arr[i] <= target) {
+          return i;
+        }
+      }
+    } else {
+      for (i = 1; i < n; ++i) {
+        if (arr[i] == target) {
+          return i;
+        } else if (arr[i] < target) {
+          if (arr[i - 1] - target < target - arr[i]) {
+            return i - 1;
+          } else {
+            return i;
+          }
+        }
+      }
+    }
+    // We should never get here, but the compiler complains
+    // if it finds a path for which no number is returned.
+    goog.asserts.fail();
+    return n - 1;
+  }
+};
+
+
+/**
+ * @param {Array.<*>} arr Array.
+ * @param {number} begin Begin index.
+ * @param {number} end End index.
+ */
+ol.array.reverseSubArray = function(arr, begin, end) {
+  goog.asserts.assert(begin >= 0,
+      'Array begin index should be equal to or greater than 0');
+  goog.asserts.assert(end < arr.length,
+      'Array end index should be less than the array length');
+  while (begin < end) {
+    var tmp = arr[begin];
+    arr[begin] = arr[end];
+    arr[end] = tmp;
+    ++begin;
+    --end;
+  }
+};
+
+goog.provide('ol.ResolutionConstraint');
+goog.provide('ol.ResolutionConstraintType');
+
+goog.require('ol.array');
+goog.require('ol.math');
+
+
+/**
+ * @typedef {function((number|undefined), number, number): (number|undefined)}
+ */
+ol.ResolutionConstraintType;
+
+
+/**
+ * @param {Array.<number>} resolutions Resolutions.
+ * @return {ol.ResolutionConstraintType} Zoom function.
+ */
+ol.ResolutionConstraint.createSnapToResolutions =
+    function(resolutions) {
+  return (
+      /**
+       * @param {number|undefined} resolution Resolution.
+       * @param {number} delta Delta.
+       * @param {number} direction Direction.
+       * @return {number|undefined} Resolution.
+       */
+      function(resolution, delta, direction) {
+        if (resolution !== undefined) {
+          var z =
+              ol.array.linearFindNearest(resolutions, resolution, direction);
+          z = ol.math.clamp(z + delta, 0, resolutions.length - 1);
+          return resolutions[z];
+        } else {
+          return undefined;
+        }
+      });
+};
+
+
+/**
+ * @param {number} power Power.
+ * @param {number} maxResolution Maximum resolution.
+ * @param {number=} opt_maxLevel Maximum level.
+ * @return {ol.ResolutionConstraintType} Zoom function.
+ */
+ol.ResolutionConstraint.createSnapToPower =
+    function(power, maxResolution, opt_maxLevel) {
+  return (
+      /**
+       * @param {number|undefined} resolution Resolution.
+       * @param {number} delta Delta.
+       * @param {number} direction Direction.
+       * @return {number|undefined} Resolution.
+       */
+      function(resolution, delta, direction) {
+        if (resolution !== undefined) {
+          var offset;
+          if (direction > 0) {
+            offset = 0;
+          } else if (direction < 0) {
+            offset = 1;
+          } else {
+            offset = 0.5;
+          }
+          var oldLevel = Math.floor(
+              Math.log(maxResolution / resolution) / Math.log(power) + offset);
+          var newLevel = Math.max(oldLevel + delta, 0);
+          if (opt_maxLevel !== undefined) {
+            newLevel = Math.min(newLevel, opt_maxLevel);
+          }
+          return maxResolution / Math.pow(power, newLevel);
+        } else {
+          return undefined;
+        }
+      });
+};
+
+goog.provide('ol.RotationConstraint');
+goog.provide('ol.RotationConstraintType');
+
+goog.require('ol.math');
+
+
+/**
+ * @typedef {function((number|undefined), number): (number|undefined)}
+ */
+ol.RotationConstraintType;
+
+
+/**
+ * @param {number|undefined} rotation Rotation.
+ * @param {number} delta Delta.
+ * @return {number|undefined} Rotation.
+ */
+ol.RotationConstraint.disable = function(rotation, delta) {
+  if (rotation !== undefined) {
+    return 0;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {number|undefined} rotation Rotation.
+ * @param {number} delta Delta.
+ * @return {number|undefined} Rotation.
+ */
+ol.RotationConstraint.none = function(rotation, delta) {
+  if (rotation !== undefined) {
+    return rotation + delta;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {number} n N.
+ * @return {ol.RotationConstraintType} Rotation constraint.
+ */
+ol.RotationConstraint.createSnapToN = function(n) {
+  var theta = 2 * Math.PI / n;
+  return (
+      /**
+       * @param {number|undefined} rotation Rotation.
+       * @param {number} delta Delta.
+       * @return {number|undefined} Rotation.
+       */
+      function(rotation, delta) {
+        if (rotation !== undefined) {
+          rotation = Math.floor((rotation + delta) / theta + 0.5) * theta;
+          return rotation;
+        } else {
+          return undefined;
+        }
+      });
+};
+
+
+/**
+ * @param {number=} opt_tolerance Tolerance.
+ * @return {ol.RotationConstraintType} Rotation constraint.
+ */
+ol.RotationConstraint.createSnapToZero = function(opt_tolerance) {
+  var tolerance = opt_tolerance || ol.math.toRadians(5);
+  return (
+      /**
+       * @param {number|undefined} rotation Rotation.
+       * @param {number} delta Delta.
+       * @return {number|undefined} Rotation.
+       */
+      function(rotation, delta) {
+        if (rotation !== undefined) {
+          if (Math.abs(rotation + delta) <= tolerance) {
+            return 0;
+          } else {
+            return rotation + delta;
+          }
+        } else {
+          return undefined;
+        }
+      });
+};
+
+goog.provide('ol.Constraints');
+
+goog.require('ol.CenterConstraintType');
+goog.require('ol.ResolutionConstraintType');
+goog.require('ol.RotationConstraintType');
+
+
+
+/**
+ * @constructor
+ * @param {ol.CenterConstraintType} centerConstraint Center constraint.
+ * @param {ol.ResolutionConstraintType} resolutionConstraint
+ *     Resolution constraint.
+ * @param {ol.RotationConstraintType} rotationConstraint
+ *     Rotation constraint.
+ */
+ol.Constraints =
+    function(centerConstraint, resolutionConstraint, rotationConstraint) {
+
+  /**
+   * @type {ol.CenterConstraintType}
+   */
+  this.center = centerConstraint;
+
+  /**
+   * @type {ol.ResolutionConstraintType}
+   */
+  this.resolution = resolutionConstraint;
+
+  /**
+   * @type {ol.RotationConstraintType}
+   */
+  this.rotation = rotationConstraint;
+
+};
+
+// Copyright 2010 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview A global registry for entry points into a program,
+ * so that they can be instrumented. Each module should register their
+ * entry points with this registry. Designed to be compiled out
+ * if no instrumentation is requested.
+ *
+ * Entry points may be registered before or after a call to
+ * goog.debug.entryPointRegistry.monitorAll. If an entry point is registered
+ * later, the existing monitor will instrument the new entry point.
+ *
+ * @author nicksantos@google.com (Nick Santos)
+ */
+
+goog.provide('goog.debug.EntryPointMonitor');
+goog.provide('goog.debug.entryPointRegistry');
+
+goog.require('goog.asserts');
+
+
+
+/**
+ * @interface
+ */
+goog.debug.EntryPointMonitor = function() {};
+
+
+/**
+ * Instruments a function.
+ *
+ * @param {!Function} fn A function to instrument.
+ * @return {!Function} The instrumented function.
+ */
+goog.debug.EntryPointMonitor.prototype.wrap;
+
+
+/**
+ * Try to remove an instrumentation wrapper created by this monitor.
+ * If the function passed to unwrap is not a wrapper created by this
+ * monitor, then we will do nothing.
+ *
+ * Notice that some wrappers may not be unwrappable. For example, if other
+ * monitors have applied their own wrappers, then it will be impossible to
+ * unwrap them because their wrappers will have captured our wrapper.
+ *
+ * So it is important that entry points are unwrapped in the reverse
+ * order that they were wrapped.
+ *
+ * @param {!Function} fn A function to unwrap.
+ * @return {!Function} The unwrapped function, or {@code fn} if it was not
+ *     a wrapped function created by this monitor.
+ */
+goog.debug.EntryPointMonitor.prototype.unwrap;
+
+
+/**
+ * An array of entry point callbacks.
+ * @type {!Array<function(!Function)>}
+ * @private
+ */
+goog.debug.entryPointRegistry.refList_ = [];
+
+
+/**
+ * Monitors that should wrap all the entry points.
+ * @type {!Array<!goog.debug.EntryPointMonitor>}
+ * @private
+ */
+goog.debug.entryPointRegistry.monitors_ = [];
+
+
+/**
+ * Whether goog.debug.entryPointRegistry.monitorAll has ever been called.
+ * Checking this allows the compiler to optimize out the registrations.
+ * @type {boolean}
+ * @private
+ */
+goog.debug.entryPointRegistry.monitorsMayExist_ = false;
+
+
+/**
+ * Register an entry point with this module.
+ *
+ * The entry point will be instrumented when a monitor is passed to
+ * goog.debug.entryPointRegistry.monitorAll. If this has already occurred, the
+ * entry point is instrumented immediately.
+ *
+ * @param {function(!Function)} callback A callback function which is called
+ *     with a transforming function to instrument the entry point. The callback
+ *     is responsible for wrapping the relevant entry point with the
+ *     transforming function.
+ */
+goog.debug.entryPointRegistry.register = function(callback) {
+  // Don't use push(), so that this can be compiled out.
+  goog.debug.entryPointRegistry.refList_[
+      goog.debug.entryPointRegistry.refList_.length] = callback;
+  // If no one calls monitorAll, this can be compiled out.
+  if (goog.debug.entryPointRegistry.monitorsMayExist_) {
+    var monitors = goog.debug.entryPointRegistry.monitors_;
+    for (var i = 0; i < monitors.length; i++) {
+      callback(goog.bind(monitors[i].wrap, monitors[i]));
+    }
+  }
+};
+
+
+/**
+ * Configures a monitor to wrap all entry points.
+ *
+ * Entry points that have already been registered are immediately wrapped by
+ * the monitor. When an entry point is registered in the future, it will also
+ * be wrapped by the monitor when it is registered.
+ *
+ * @param {!goog.debug.EntryPointMonitor} monitor An entry point monitor.
+ */
+goog.debug.entryPointRegistry.monitorAll = function(monitor) {
+  goog.debug.entryPointRegistry.monitorsMayExist_ = true;
+  var transformer = goog.bind(monitor.wrap, monitor);
+  for (var i = 0; i < goog.debug.entryPointRegistry.refList_.length; i++) {
+    goog.debug.entryPointRegistry.refList_[i](transformer);
+  }
+  goog.debug.entryPointRegistry.monitors_.push(monitor);
+};
+
+
+/**
+ * Try to unmonitor all the entry points that have already been registered. If
+ * an entry point is registered in the future, it will not be wrapped by the
+ * monitor when it is registered. Note that this may fail if the entry points
+ * have additional wrapping.
+ *
+ * @param {!goog.debug.EntryPointMonitor} monitor The last monitor to wrap
+ *     the entry points.
+ * @throws {Error} If the monitor is not the most recently configured monitor.
+ */
+goog.debug.entryPointRegistry.unmonitorAllIfPossible = function(monitor) {
+  var monitors = goog.debug.entryPointRegistry.monitors_;
+  goog.asserts.assert(monitor == monitors[monitors.length - 1],
+      'Only the most recent monitor can be unwrapped.');
+  var transformer = goog.bind(monitor.unwrap, monitor);
+  for (var i = 0; i < goog.debug.entryPointRegistry.refList_.length; i++) {
+    goog.debug.entryPointRegistry.refList_[i](transformer);
+  }
+  monitors.length--;
+};
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Utilities used by goog.labs.userAgent tools. These functions
+ * should not be used outside of goog.labs.userAgent.*.
+ *
+ *
+ * @author nnaze@google.com (Nathan Naze)
+ */
+
+goog.provide('goog.labs.userAgent.util');
+
+goog.require('goog.string');
+
+
+/**
+ * Gets the native userAgent string from navigator if it exists.
+ * If navigator or navigator.userAgent string is missing, returns an empty
+ * string.
+ * @return {string}
+ * @private
+ */
+goog.labs.userAgent.util.getNativeUserAgentString_ = function() {
+  var navigator = goog.labs.userAgent.util.getNavigator_();
+  if (navigator) {
+    var userAgent = navigator.userAgent;
+    if (userAgent) {
+      return userAgent;
+    }
+  }
+  return '';
+};
+
+
+/**
+ * Getter for the native navigator.
+ * This is a separate function so it can be stubbed out in testing.
+ * @return {Navigator}
+ * @private
+ */
+goog.labs.userAgent.util.getNavigator_ = function() {
+  return goog.global.navigator;
+};
+
+
+/**
+ * A possible override for applications which wish to not check
+ * navigator.userAgent but use a specified value for detection instead.
+ * @private {string}
+ */
+goog.labs.userAgent.util.userAgent_ =
+    goog.labs.userAgent.util.getNativeUserAgentString_();
+
+
+/**
+ * Applications may override browser detection on the built in
+ * navigator.userAgent object by setting this string. Set to null to use the
+ * browser object instead.
+ * @param {?string=} opt_userAgent The User-Agent override.
+ */
+goog.labs.userAgent.util.setUserAgent = function(opt_userAgent) {
+  goog.labs.userAgent.util.userAgent_ = opt_userAgent ||
+      goog.labs.userAgent.util.getNativeUserAgentString_();
+};
+
+
+/**
+ * @return {string} The user agent string.
+ */
+goog.labs.userAgent.util.getUserAgent = function() {
+  return goog.labs.userAgent.util.userAgent_;
+};
+
+
+/**
+ * @param {string} str
+ * @return {boolean} Whether the user agent contains the given string, ignoring
+ *     case.
+ */
+goog.labs.userAgent.util.matchUserAgent = function(str) {
+  var userAgent = goog.labs.userAgent.util.getUserAgent();
+  return goog.string.contains(userAgent, str);
+};
+
+
+/**
+ * @param {string} str
+ * @return {boolean} Whether the user agent contains the given string.
+ */
+goog.labs.userAgent.util.matchUserAgentIgnoreCase = function(str) {
+  var userAgent = goog.labs.userAgent.util.getUserAgent();
+  return goog.string.caseInsensitiveContains(userAgent, str);
+};
+
+
+/**
+ * Parses the user agent into tuples for each section.
+ * @param {string} userAgent
+ * @return {!Array<!Array<string>>} Tuples of key, version, and the contents
+ *     of the parenthetical.
+ */
+goog.labs.userAgent.util.extractVersionTuples = function(userAgent) {
+  // Matches each section of a user agent string.
+  // Example UA:
+  // Mozilla/5.0 (iPad; U; CPU OS 3_2_1 like Mac OS X; en-us)
+  // AppleWebKit/531.21.10 (KHTML, like Gecko) Mobile/7B405
+  // This has three version tuples: Mozilla, AppleWebKit, and Mobile.
+
+  var versionRegExp = new RegExp(
+      // Key. Note that a key may have a space.
+      // (i.e. 'Mobile Safari' in 'Mobile Safari/5.0')
+      '(\\w[\\w ]+)' +
+
+      '/' +                // slash
+      '([^\\s]+)' +        // version (i.e. '5.0b')
+      '\\s*' +             // whitespace
+      '(?:\\((.*?)\\))?',  // parenthetical info. parentheses not matched.
+      'g');
+
+  var data = [];
+  var match;
+
+  // Iterate and collect the version tuples.  Each iteration will be the
+  // next regex match.
+  while (match = versionRegExp.exec(userAgent)) {
+    data.push([
+      match[1],  // key
+      match[2],  // value
+      // || undefined as this is not undefined in IE7 and IE8
+      match[3] || undefined  // info
+    ]);
+  }
+
+  return data;
+};
+
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Utilities for manipulating objects/maps/hashes.
+ * @author arv@google.com (Erik Arvidsson)
+ */
+
+goog.provide('goog.object');
+
+
+/**
+ * Calls a function for each element in an object/map/hash.
+ *
+ * @param {Object<K,V>} obj The object over which to iterate.
+ * @param {function(this:T,V,?,Object<K,V>):?} f The function to call
+ *     for every element. This function takes 3 arguments (the value, the
+ *     key and the object) and the return value is ignored.
+ * @param {T=} opt_obj This is used as the 'this' object within f.
+ * @template T,K,V
+ */
+goog.object.forEach = function(obj, f, opt_obj) {
+  for (var key in obj) {
+    f.call(opt_obj, obj[key], key, obj);
+  }
+};
+
+
+/**
+ * Calls a function for each element in an object/map/hash. If that call returns
+ * true, adds the element to a new object.
+ *
+ * @param {Object<K,V>} obj The object over which to iterate.
+ * @param {function(this:T,V,?,Object<K,V>):boolean} f The function to call
+ *     for every element. This
+ *     function takes 3 arguments (the value, the key and the object)
+ *     and should return a boolean. If the return value is true the
+ *     element is added to the result object. If it is false the
+ *     element is not included.
+ * @param {T=} opt_obj This is used as the 'this' object within f.
+ * @return {!Object<K,V>} a new object in which only elements that passed the
+ *     test are present.
+ * @template T,K,V
+ */
+goog.object.filter = function(obj, f, opt_obj) {
+  var res = {};
+  for (var key in obj) {
+    if (f.call(opt_obj, obj[key], key, obj)) {
+      res[key] = obj[key];
+    }
+  }
+  return res;
+};
+
+
+/**
+ * For every element in an object/map/hash calls a function and inserts the
+ * result into a new object.
+ *
+ * @param {Object<K,V>} obj The object over which to iterate.
+ * @param {function(this:T,V,?,Object<K,V>):R} f The function to call
+ *     for every element. This function
+ *     takes 3 arguments (the value, the key and the object)
+ *     and should return something. The result will be inserted
+ *     into a new object.
+ * @param {T=} opt_obj This is used as the 'this' object within f.
+ * @return {!Object<K,R>} a new object with the results from f.
+ * @template T,K,V,R
+ */
+goog.object.map = function(obj, f, opt_obj) {
+  var res = {};
+  for (var key in obj) {
+    res[key] = f.call(opt_obj, obj[key], key, obj);
+  }
+  return res;
+};
+
+
+/**
+ * Calls a function for each element in an object/map/hash. If any
+ * call returns true, returns true (without checking the rest). If
+ * all calls return false, returns false.
+ *
+ * @param {Object<K,V>} obj The object to check.
+ * @param {function(this:T,V,?,Object<K,V>):boolean} f The function to
+ *     call for every element. This function
+ *     takes 3 arguments (the value, the key and the object) and should
+ *     return a boolean.
+ * @param {T=} opt_obj This is used as the 'this' object within f.
+ * @return {boolean} true if any element passes the test.
+ * @template T,K,V
+ */
+goog.object.some = function(obj, f, opt_obj) {
+  for (var key in obj) {
+    if (f.call(opt_obj, obj[key], key, obj)) {
+      return true;
+    }
+  }
+  return false;
+};
+
+
+/**
+ * Calls a function for each element in an object/map/hash. If
+ * all calls return true, returns true. If any call returns false, returns
+ * false at this point and does not continue to check the remaining elements.
+ *
+ * @param {Object<K,V>} obj The object to check.
+ * @param {?function(this:T,V,?,Object<K,V>):boolean} f The function to
+ *     call for every element. This function
+ *     takes 3 arguments (the value, the key and the object) and should
+ *     return a boolean.
+ * @param {T=} opt_obj This is used as the 'this' object within f.
+ * @return {boolean} false if any element fails the test.
+ * @template T,K,V
+ */
+goog.object.every = function(obj, f, opt_obj) {
+  for (var key in obj) {
+    if (!f.call(opt_obj, obj[key], key, obj)) {
+      return false;
+    }
+  }
+  return true;
+};
+
+
+/**
+ * Returns the number of key-value pairs in the object map.
+ *
+ * @param {Object} obj The object for which to get the number of key-value
+ *     pairs.
+ * @return {number} The number of key-value pairs in the object map.
+ */
+goog.object.getCount = function(obj) {
+  // JS1.5 has __count__ but it has been deprecated so it raises a warning...
+  // in other words do not use. Also __count__ only includes the fields on the
+  // actual object and not in the prototype chain.
+  var rv = 0;
+  for (var key in obj) {
+    rv++;
+  }
+  return rv;
+};
+
+
+/**
+ * Returns one key from the object map, if any exists.
+ * For map literals the returned key will be the first one in most of the
+ * browsers (a know exception is Konqueror).
+ *
+ * @param {Object} obj The object to pick a key from.
+ * @return {string|undefined} The key or undefined if the object is empty.
+ */
+goog.object.getAnyKey = function(obj) {
+  for (var key in obj) {
+    return key;
+  }
+};
+
+
+/**
+ * Returns one value from the object map, if any exists.
+ * For map literals the returned value will be the first one in most of the
+ * browsers (a know exception is Konqueror).
+ *
+ * @param {Object<K,V>} obj The object to pick a value from.
+ * @return {V|undefined} The value or undefined if the object is empty.
+ * @template K,V
+ */
+goog.object.getAnyValue = function(obj) {
+  for (var key in obj) {
+    return obj[key];
+  }
+};
+
+
+/**
+ * Whether the object/hash/map contains the given object as a value.
+ * An alias for goog.object.containsValue(obj, val).
+ *
+ * @param {Object<K,V>} obj The object in which to look for val.
+ * @param {V} val The object for which to check.
+ * @return {boolean} true if val is present.
+ * @template K,V
+ */
+goog.object.contains = function(obj, val) {
+  return goog.object.containsValue(obj, val);
+};
+
+
+/**
+ * Returns the values of the object/map/hash.
+ *
+ * @param {Object<K,V>} obj The object from which to get the values.
+ * @return {!Array<V>} The values in the object/map/hash.
+ * @template K,V
+ */
+goog.object.getValues = function(obj) {
+  var res = [];
+  var i = 0;
+  for (var key in obj) {
+    res[i++] = obj[key];
+  }
+  return res;
+};
+
+
+/**
+ * Returns the keys of the object/map/hash.
+ *
+ * @param {Object} obj The object from which to get the keys.
+ * @return {!Array<string>} Array of property keys.
+ */
+goog.object.getKeys = function(obj) {
+  var res = [];
+  var i = 0;
+  for (var key in obj) {
+    res[i++] = key;
+  }
+  return res;
+};
+
+
+/**
+ * Get a value from an object multiple levels deep.  This is useful for
+ * pulling values from deeply nested objects, such as JSON responses.
+ * Example usage: getValueByKeys(jsonObj, 'foo', 'entries', 3)
+ *
+ * @param {!Object} obj An object to get the value from.  Can be array-like.
+ * @param {...(string|number|!Array<number|string>)} var_args A number of keys
+ *     (as strings, or numbers, for array-like objects).  Can also be
+ *     specified as a single array of keys.
+ * @return {*} The resulting value.  If, at any point, the value for a key
+ *     is undefined, returns undefined.
+ */
+goog.object.getValueByKeys = function(obj, var_args) {
+  var isArrayLike = goog.isArrayLike(var_args);
+  var keys = isArrayLike ? var_args : arguments;
+
+  // Start with the 2nd parameter for the variable parameters syntax.
+  for (var i = isArrayLike ? 0 : 1; i < keys.length; i++) {
+    obj = obj[keys[i]];
+    if (!goog.isDef(obj)) {
+      break;
+    }
+  }
+
+  return obj;
+};
+
+
+/**
+ * Whether the object/map/hash contains the given key.
+ *
+ * @param {Object} obj The object in which to look for key.
+ * @param {*} key The key for which to check.
+ * @return {boolean} true If the map contains the key.
+ */
+goog.object.containsKey = function(obj, key) {
+  return key in obj;
+};
+
+
+/**
+ * Whether the object/map/hash contains the given value. This is O(n).
+ *
+ * @param {Object<K,V>} obj The object in which to look for val.
+ * @param {V} val The value for which to check.
+ * @return {boolean} true If the map contains the value.
+ * @template K,V
+ */
+goog.object.containsValue = function(obj, val) {
+  for (var key in obj) {
+    if (obj[key] == val) {
+      return true;
+    }
+  }
+  return false;
+};
+
+
+/**
+ * Searches an object for an element that satisfies the given condition and
+ * returns its key.
+ * @param {Object<K,V>} obj The object to search in.
+ * @param {function(this:T,V,string,Object<K,V>):boolean} f The
+ *      function to call for every element. Takes 3 arguments (the value,
+ *     the key and the object) and should return a boolean.
+ * @param {T=} opt_this An optional "this" context for the function.
+ * @return {string|undefined} The key of an element for which the function
+ *     returns true or undefined if no such element is found.
+ * @template T,K,V
+ */
+goog.object.findKey = function(obj, f, opt_this) {
+  for (var key in obj) {
+    if (f.call(opt_this, obj[key], key, obj)) {
+      return key;
+    }
+  }
+  return undefined;
+};
+
+
+/**
+ * Searches an object for an element that satisfies the given condition and
+ * returns its value.
+ * @param {Object<K,V>} obj The object to search in.
+ * @param {function(this:T,V,string,Object<K,V>):boolean} f The function
+ *     to call for every element. Takes 3 arguments (the value, the key
+ *     and the object) and should return a boolean.
+ * @param {T=} opt_this An optional "this" context for the function.
+ * @return {V} The value of an element for which the function returns true or
+ *     undefined if no such element is found.
+ * @template T,K,V
+ */
+goog.object.findValue = function(obj, f, opt_this) {
+  var key = goog.object.findKey(obj, f, opt_this);
+  return key && obj[key];
+};
+
+
+/**
+ * Whether the object/map/hash is empty.
+ *
+ * @param {Object} obj The object to test.
+ * @return {boolean} true if obj is empty.
+ */
+goog.object.isEmpty = function(obj) {
+  for (var key in obj) {
+    return false;
+  }
+  return true;
+};
+
+
+/**
+ * Removes all key value pairs from the object/map/hash.
+ *
+ * @param {Object} obj The object to clear.
+ */
+goog.object.clear = function(obj) {
+  for (var i in obj) {
+    delete obj[i];
+  }
+};
+
+
+/**
+ * Removes a key-value pair based on the key.
+ *
+ * @param {Object} obj The object from which to remove the key.
+ * @param {*} key The key to remove.
+ * @return {boolean} Whether an element was removed.
+ */
+goog.object.remove = function(obj, key) {
+  var rv;
+  if ((rv = key in obj)) {
+    delete obj[key];
+  }
+  return rv;
+};
+
+
+/**
+ * Adds a key-value pair to the object. Throws an exception if the key is
+ * already in use. Use set if you want to change an existing pair.
+ *
+ * @param {Object<K,V>} obj The object to which to add the key-value pair.
+ * @param {string} key The key to add.
+ * @param {V} val The value to add.
+ * @template K,V
+ */
+goog.object.add = function(obj, key, val) {
+  if (key in obj) {
+    throw Error('The object already contains the key "' + key + '"');
+  }
+  goog.object.set(obj, key, val);
+};
+
+
+/**
+ * Returns the value for the given key.
+ *
+ * @param {Object<K,V>} obj The object from which to get the value.
+ * @param {string} key The key for which to get the value.
+ * @param {R=} opt_val The value to return if no item is found for the given
+ *     key (default is undefined).
+ * @return {V|R|undefined} The value for the given key.
+ * @template K,V,R
+ */
+goog.object.get = function(obj, key, opt_val) {
+  if (key in obj) {
+    return obj[key];
+  }
+  return opt_val;
+};
+
+
+/**
+ * Adds a key-value pair to the object/map/hash.
+ *
+ * @param {Object<K,V>} obj The object to which to add the key-value pair.
+ * @param {string} key The key to add.
+ * @param {V} value The value to add.
+ * @template K,V
+ */
+goog.object.set = function(obj, key, value) {
+  obj[key] = value;
+};
+
+
+/**
+ * Adds a key-value pair to the object/map/hash if it doesn't exist yet.
+ *
+ * @param {Object<K,V>} obj The object to which to add the key-value pair.
+ * @param {string} key The key to add.
+ * @param {V} value The value to add if the key wasn't present.
+ * @return {V} The value of the entry at the end of the function.
+ * @template K,V
+ */
+goog.object.setIfUndefined = function(obj, key, value) {
+  return key in obj ? obj[key] : (obj[key] = value);
+};
+
+
+/**
+ * Sets a key and value to an object if the key is not set. The value will be
+ * the return value of the given function. If the key already exists, the
+ * object will not be changed and the function will not be called (the function
+ * will be lazily evaluated -- only called if necessary).
+ *
+ * This function is particularly useful for use with a map used a as a cache.
+ *
+ * @param {!Object<K,V>} obj The object to which to add the key-value pair.
+ * @param {string} key The key to add.
+ * @param {function():V} f The value to add if the key wasn't present.
+ * @return {V} The value of the entry at the end of the function.
+ * @template K,V
+ */
+goog.object.setWithReturnValueIfNotSet = function(obj, key, f) {
+  if (key in obj) {
+    return obj[key];
+  }
+
+  var val = f();
+  obj[key] = val;
+  return val;
+};
+
+
+/**
+ * Compares two objects for equality using === on the values.
+ *
+ * @param {!Object<K,V>} a
+ * @param {!Object<K,V>} b
+ * @return {boolean}
+ * @template K,V
+ */
+goog.object.equals = function(a, b) {
+  for (var k in a) {
+    if (!(k in b) || a[k] !== b[k]) {
+      return false;
+    }
+  }
+  for (var k in b) {
+    if (!(k in a)) {
+      return false;
+    }
+  }
+  return true;
+};
+
+
+/**
+ * Does a flat clone of the object.
+ *
+ * @param {Object<K,V>} obj Object to clone.
+ * @return {!Object<K,V>} Clone of the input object.
+ * @template K,V
+ */
+goog.object.clone = function(obj) {
+  // We cannot use the prototype trick because a lot of methods depend on where
+  // the actual key is set.
+
+  var res = {};
+  for (var key in obj) {
+    res[key] = obj[key];
+  }
+  return res;
+  // We could also use goog.mixin but I wanted this to be independent from that.
+};
+
+
+/**
+ * Clones a value. The input may be an Object, Array, or basic type. Objects and
+ * arrays will be cloned recursively.
+ *
+ * WARNINGS:
+ * <code>goog.object.unsafeClone</code> does not detect reference loops. Objects
+ * that refer to themselves will cause infinite recursion.
+ *
+ * <code>goog.object.unsafeClone</code> is unaware of unique identifiers, and
+ * copies UIDs created by <code>getUid</code> into cloned results.
+ *
+ * @param {*} obj The value to clone.
+ * @return {*} A clone of the input value.
+ */
+goog.object.unsafeClone = function(obj) {
+  var type = goog.typeOf(obj);
+  if (type == 'object' || type == 'array') {
+    if (goog.isFunction(obj.clone)) {
+      return obj.clone();
+    }
+    var clone = type == 'array' ? [] : {};
+    for (var key in obj) {
+      clone[key] = goog.object.unsafeClone(obj[key]);
+    }
+    return clone;
+  }
+
+  return obj;
+};
+
+
+/**
+ * Returns a new object in which all the keys and values are interchanged
+ * (keys become values and values become keys). If multiple keys map to the
+ * same value, the chosen transposed value is implementation-dependent.
+ *
+ * @param {Object} obj The object to transpose.
+ * @return {!Object} The transposed object.
+ */
+goog.object.transpose = function(obj) {
+  var transposed = {};
+  for (var key in obj) {
+    transposed[obj[key]] = key;
+  }
+  return transposed;
+};
+
+
+/**
+ * The names of the fields that are defined on Object.prototype.
+ * @type {Array<string>}
+ * @private
+ */
+goog.object.PROTOTYPE_FIELDS_ = [
+  'constructor',
+  'hasOwnProperty',
+  'isPrototypeOf',
+  'propertyIsEnumerable',
+  'toLocaleString',
+  'toString',
+  'valueOf'
+];
+
+
+/**
+ * Extends an object with another object.
+ * This operates 'in-place'; it does not create a new Object.
+ *
+ * Example:
+ * var o = {};
+ * goog.object.extend(o, {a: 0, b: 1});
+ * o; // {a: 0, b: 1}
+ * goog.object.extend(o, {b: 2, c: 3});
+ * o; // {a: 0, b: 2, c: 3}
+ *
+ * @param {Object} target The object to modify. Existing properties will be
+ *     overwritten if they are also present in one of the objects in
+ *     {@code var_args}.
+ * @param {...Object} var_args The objects from which values will be copied.
+ */
+goog.object.extend = function(target, var_args) {
+  var key, source;
+  for (var i = 1; i < arguments.length; i++) {
+    source = arguments[i];
+    for (key in source) {
+      target[key] = source[key];
+    }
+
+    // For IE the for-in-loop does not contain any properties that are not
+    // enumerable on the prototype object (for example isPrototypeOf from
+    // Object.prototype) and it will also not include 'replace' on objects that
+    // extend String and change 'replace' (not that it is common for anyone to
+    // extend anything except Object).
+
+    for (var j = 0; j < goog.object.PROTOTYPE_FIELDS_.length; j++) {
+      key = goog.object.PROTOTYPE_FIELDS_[j];
+      if (Object.prototype.hasOwnProperty.call(source, key)) {
+        target[key] = source[key];
+      }
+    }
+  }
+};
+
+
+/**
+ * Creates a new object built from the key-value pairs provided as arguments.
+ * @param {...*} var_args If only one argument is provided and it is an array
+ *     then this is used as the arguments,  otherwise even arguments are used as
+ *     the property names and odd arguments are used as the property values.
+ * @return {!Object} The new object.
+ * @throws {Error} If there are uneven number of arguments or there is only one
+ *     non array argument.
+ */
+goog.object.create = function(var_args) {
+  var argLength = arguments.length;
+  if (argLength == 1 && goog.isArray(arguments[0])) {
+    return goog.object.create.apply(null, arguments[0]);
+  }
+
+  if (argLength % 2) {
+    throw Error('Uneven number of arguments');
+  }
+
+  var rv = {};
+  for (var i = 0; i < argLength; i += 2) {
+    rv[arguments[i]] = arguments[i + 1];
+  }
+  return rv;
+};
+
+
+/**
+ * Creates a new object where the property names come from the arguments but
+ * the value is always set to true
+ * @param {...*} var_args If only one argument is provided and it is an array
+ *     then this is used as the arguments,  otherwise the arguments are used
+ *     as the property names.
+ * @return {!Object} The new object.
+ */
+goog.object.createSet = function(var_args) {
+  var argLength = arguments.length;
+  if (argLength == 1 && goog.isArray(arguments[0])) {
+    return goog.object.createSet.apply(null, arguments[0]);
+  }
+
+  var rv = {};
+  for (var i = 0; i < argLength; i++) {
+    rv[arguments[i]] = true;
+  }
+  return rv;
+};
+
+
+/**
+ * Creates an immutable view of the underlying object, if the browser
+ * supports immutable objects.
+ *
+ * In default mode, writes to this view will fail silently. In strict mode,
+ * they will throw an error.
+ *
+ * @param {!Object<K,V>} obj An object.
+ * @return {!Object<K,V>} An immutable view of that object, or the
+ *     original object if this browser does not support immutables.
+ * @template K,V
+ */
+goog.object.createImmutableView = function(obj) {
+  var result = obj;
+  if (Object.isFrozen && !Object.isFrozen(obj)) {
+    result = Object.create(obj);
+    Object.freeze(result);
+  }
+  return result;
+};
+
+
+/**
+ * @param {!Object} obj An object.
+ * @return {boolean} Whether this is an immutable view of the object.
+ */
+goog.object.isImmutableView = function(obj) {
+  return !!Object.isFrozen && Object.isFrozen(obj);
+};
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Closure user agent detection (Browser).
+ * @see <a href="http://www.useragentstring.com/">User agent strings</a>
+ * For more information on rendering engine, platform, or device see the other
+ * sub-namespaces in goog.labs.userAgent, goog.labs.userAgent.platform,
+ * goog.labs.userAgent.device respectively.)
+ *
+ * @author martone@google.com (Andy Martone)
+ */
+
+goog.provide('goog.labs.userAgent.browser');
+
+goog.require('goog.array');
+goog.require('goog.labs.userAgent.util');
+goog.require('goog.object');
+goog.require('goog.string');
+
+
+// TODO(nnaze): Refactor to remove excessive exclusion logic in matching
+// functions.
+
+
+/**
+ * @return {boolean} Whether the user's browser is Opera.
+ * @private
+ */
+goog.labs.userAgent.browser.matchOpera_ = function() {
+  return goog.labs.userAgent.util.matchUserAgent('Opera') ||
+      goog.labs.userAgent.util.matchUserAgent('OPR');
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is IE.
+ * @private
+ */
+goog.labs.userAgent.browser.matchIE_ = function() {
+  return goog.labs.userAgent.util.matchUserAgent('Trident') ||
+      goog.labs.userAgent.util.matchUserAgent('MSIE');
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is Edge.
+ * @private
+ */
+goog.labs.userAgent.browser.matchEdge_ = function() {
+  return goog.labs.userAgent.util.matchUserAgent('Edge');
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is Firefox.
+ * @private
+ */
+goog.labs.userAgent.browser.matchFirefox_ = function() {
+  return goog.labs.userAgent.util.matchUserAgent('Firefox');
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is Safari.
+ * @private
+ */
+goog.labs.userAgent.browser.matchSafari_ = function() {
+  return goog.labs.userAgent.util.matchUserAgent('Safari') &&
+      !(goog.labs.userAgent.browser.matchChrome_() ||
+        goog.labs.userAgent.browser.matchCoast_() ||
+        goog.labs.userAgent.browser.matchOpera_() ||
+        goog.labs.userAgent.browser.matchEdge_() ||
+        goog.labs.userAgent.browser.isSilk() ||
+        goog.labs.userAgent.util.matchUserAgent('Android'));
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is Coast (Opera's Webkit-based
+ *     iOS browser).
+ * @private
+ */
+goog.labs.userAgent.browser.matchCoast_ = function() {
+  return goog.labs.userAgent.util.matchUserAgent('Coast');
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is iOS Webview.
+ * @private
+ */
+goog.labs.userAgent.browser.matchIosWebview_ = function() {
+  // iOS Webview does not show up as Chrome or Safari. Also check for Opera's
+  // WebKit-based iOS browser, Coast.
+  return (goog.labs.userAgent.util.matchUserAgent('iPad') ||
+          goog.labs.userAgent.util.matchUserAgent('iPhone')) &&
+      !goog.labs.userAgent.browser.matchSafari_() &&
+      !goog.labs.userAgent.browser.matchChrome_() &&
+      !goog.labs.userAgent.browser.matchCoast_() &&
+      goog.labs.userAgent.util.matchUserAgent('AppleWebKit');
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is Chrome.
+ * @private
+ */
+goog.labs.userAgent.browser.matchChrome_ = function() {
+  return (goog.labs.userAgent.util.matchUserAgent('Chrome') ||
+      goog.labs.userAgent.util.matchUserAgent('CriOS')) &&
+      !goog.labs.userAgent.browser.matchOpera_() &&
+      !goog.labs.userAgent.browser.matchEdge_();
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is the Android browser.
+ * @private
+ */
+goog.labs.userAgent.browser.matchAndroidBrowser_ = function() {
+  // Android can appear in the user agent string for Chrome on Android.
+  // This is not the Android standalone browser if it does.
+  return goog.labs.userAgent.util.matchUserAgent('Android') &&
+      !(goog.labs.userAgent.browser.isChrome() ||
+        goog.labs.userAgent.browser.isFirefox() ||
+        goog.labs.userAgent.browser.isOpera() ||
+        goog.labs.userAgent.browser.isSilk());
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is Opera.
+ */
+goog.labs.userAgent.browser.isOpera = goog.labs.userAgent.browser.matchOpera_;
+
+
+/**
+ * @return {boolean} Whether the user's browser is IE.
+ */
+goog.labs.userAgent.browser.isIE = goog.labs.userAgent.browser.matchIE_;
+
+
+/**
+ * @return {boolean} Whether the user's browser is Edge.
+ */
+goog.labs.userAgent.browser.isEdge = goog.labs.userAgent.browser.matchEdge_;
+
+
+/**
+ * @return {boolean} Whether the user's browser is Firefox.
+ */
+goog.labs.userAgent.browser.isFirefox =
+    goog.labs.userAgent.browser.matchFirefox_;
+
+
+/**
+ * @return {boolean} Whether the user's browser is Safari.
+ */
+goog.labs.userAgent.browser.isSafari =
+    goog.labs.userAgent.browser.matchSafari_;
+
+
+/**
+ * @return {boolean} Whether the user's browser is Coast (Opera's Webkit-based
+ *     iOS browser).
+ */
+goog.labs.userAgent.browser.isCoast =
+    goog.labs.userAgent.browser.matchCoast_;
+
+
+/**
+ * @return {boolean} Whether the user's browser is iOS Webview.
+ */
+goog.labs.userAgent.browser.isIosWebview =
+    goog.labs.userAgent.browser.matchIosWebview_;
+
+
+/**
+ * @return {boolean} Whether the user's browser is Chrome.
+ */
+goog.labs.userAgent.browser.isChrome =
+    goog.labs.userAgent.browser.matchChrome_;
+
+
+/**
+ * @return {boolean} Whether the user's browser is the Android browser.
+ */
+goog.labs.userAgent.browser.isAndroidBrowser =
+    goog.labs.userAgent.browser.matchAndroidBrowser_;
+
+
+/**
+ * For more information, see:
+ * http://docs.aws.amazon.com/silk/latest/developerguide/user-agent.html
+ * @return {boolean} Whether the user's browser is Silk.
+ */
+goog.labs.userAgent.browser.isSilk = function() {
+  return goog.labs.userAgent.util.matchUserAgent('Silk');
+};
+
+
+/**
+ * @return {string} The browser version or empty string if version cannot be
+ *     determined. Note that for Internet Explorer, this returns the version of
+ *     the browser, not the version of the rendering engine. (IE 8 in
+ *     compatibility mode will return 8.0 rather than 7.0. To determine the
+ *     rendering engine version, look at document.documentMode instead. See
+ *     http://msdn.microsoft.com/en-us/library/cc196988(v=vs.85).aspx for more
+ *     details.)
+ */
+goog.labs.userAgent.browser.getVersion = function() {
+  var userAgentString = goog.labs.userAgent.util.getUserAgent();
+  // Special case IE since IE's version is inside the parenthesis and
+  // without the '/'.
+  if (goog.labs.userAgent.browser.isIE()) {
+    return goog.labs.userAgent.browser.getIEVersion_(userAgentString);
+  }
+
+  var versionTuples = goog.labs.userAgent.util.extractVersionTuples(
+      userAgentString);
+
+  // Construct a map for easy lookup.
+  var versionMap = {};
+  goog.array.forEach(versionTuples, function(tuple) {
+    // Note that the tuple is of length three, but we only care about the
+    // first two.
+    var key = tuple[0];
+    var value = tuple[1];
+    versionMap[key] = value;
+  });
+
+  var versionMapHasKey = goog.partial(goog.object.containsKey, versionMap);
+
+  // Gives the value with the first key it finds, otherwise empty string.
+  function lookUpValueWithKeys(keys) {
+    var key = goog.array.find(keys, versionMapHasKey);
+    return versionMap[key] || '';
+  }
+
+  // Check Opera before Chrome since Opera 15+ has "Chrome" in the string.
+  // See
+  // http://my.opera.com/ODIN/blog/2013/07/15/opera-user-agent-strings-opera-15-and-beyond
+  if (goog.labs.userAgent.browser.isOpera()) {
+    // Opera 10 has Version/10.0 but Opera/9.8, so look for "Version" first.
+    // Opera uses 'OPR' for more recent UAs.
+    return lookUpValueWithKeys(['Version', 'Opera', 'OPR']);
+  }
+
+  // Check Edge before Chrome since it has Chrome in the string.
+  if (goog.labs.userAgent.browser.isEdge()) {
+    return lookUpValueWithKeys(['Edge']);
+  }
+
+  if (goog.labs.userAgent.browser.isChrome()) {
+    return lookUpValueWithKeys(['Chrome', 'CriOS']);
+  }
+
+  // Usually products browser versions are in the third tuple after "Mozilla"
+  // and the engine.
+  var tuple = versionTuples[2];
+  return tuple && tuple[1] || '';
+};
+
+
+/**
+ * @param {string|number} version The version to check.
+ * @return {boolean} Whether the browser version is higher or the same as the
+ *     given version.
+ */
+goog.labs.userAgent.browser.isVersionOrHigher = function(version) {
+  return goog.string.compareVersions(goog.labs.userAgent.browser.getVersion(),
+                                     version) >= 0;
+};
+
+
+/**
+ * Determines IE version. More information:
+ * http://msdn.microsoft.com/en-us/library/ie/bg182625(v=vs.85).aspx#uaString
+ * http://msdn.microsoft.com/en-us/library/hh869301(v=vs.85).aspx
+ * http://blogs.msdn.com/b/ie/archive/2010/03/23/introducing-ie9-s-user-agent-string.aspx
+ * http://blogs.msdn.com/b/ie/archive/2009/01/09/the-internet-explorer-8-user-agent-string-updated-edition.aspx
+ *
+ * @param {string} userAgent the User-Agent.
+ * @return {string}
+ * @private
+ */
+goog.labs.userAgent.browser.getIEVersion_ = function(userAgent) {
+  // IE11 may identify itself as MSIE 9.0 or MSIE 10.0 due to an IE 11 upgrade
+  // bug. Example UA:
+  // Mozilla/5.0 (MSIE 9.0; Windows NT 6.1; WOW64; Trident/7.0; rv:11.0)
+  // like Gecko.
+  // See http://www.whatismybrowser.com/developers/unknown-user-agent-fragments.
+  var rv = /rv: *([\d\.]*)/.exec(userAgent);
+  if (rv && rv[1]) {
+    return rv[1];
+  }
+
+  var version = '';
+  var msie = /MSIE +([\d\.]+)/.exec(userAgent);
+  if (msie && msie[1]) {
+    // IE in compatibility mode usually identifies itself as MSIE 7.0; in this
+    // case, use the Trident version to determine the version of IE. For more
+    // details, see the links above.
+    var tridentVersion = /Trident\/(\d.\d)/.exec(userAgent);
+    if (msie[1] == '7.0') {
+      if (tridentVersion && tridentVersion[1]) {
+        switch (tridentVersion[1]) {
+          case '4.0':
+            version = '8.0';
+            break;
+          case '5.0':
+            version = '9.0';
+            break;
+          case '6.0':
+            version = '10.0';
+            break;
+          case '7.0':
+            version = '11.0';
+            break;
+        }
+      } else {
+        version = '7.0';
+      }
+    } else {
+      version = msie[1];
+    }
+  }
+  return version;
+};
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Closure user agent detection.
+ * @see http://en.wikipedia.org/wiki/User_agent
+ * For more information on browser brand, platform, or device see the other
+ * sub-namespaces in goog.labs.userAgent (browser, platform, and device).
+ *
+ */
+
+goog.provide('goog.labs.userAgent.engine');
+
+goog.require('goog.array');
+goog.require('goog.labs.userAgent.util');
+goog.require('goog.string');
+
+
+/**
+ * @return {boolean} Whether the rendering engine is Presto.
+ */
+goog.labs.userAgent.engine.isPresto = function() {
+  return goog.labs.userAgent.util.matchUserAgent('Presto');
+};
+
+
+/**
+ * @return {boolean} Whether the rendering engine is Trident.
+ */
+goog.labs.userAgent.engine.isTrident = function() {
+  // IE only started including the Trident token in IE8.
+  return goog.labs.userAgent.util.matchUserAgent('Trident') ||
+      goog.labs.userAgent.util.matchUserAgent('MSIE');
+};
+
+
+/**
+ * @return {boolean} Whether the rendering engine is Edge.
+ */
+goog.labs.userAgent.engine.isEdge = function() {
+  return goog.labs.userAgent.util.matchUserAgent('Edge');
+};
+
+
+/**
+ * @return {boolean} Whether the rendering engine is WebKit.
+ */
+goog.labs.userAgent.engine.isWebKit = function() {
+  return goog.labs.userAgent.util.matchUserAgentIgnoreCase('WebKit') &&
+      !goog.labs.userAgent.engine.isEdge();
+};
+
+
+/**
+ * @return {boolean} Whether the rendering engine is Gecko.
+ */
+goog.labs.userAgent.engine.isGecko = function() {
+  return goog.labs.userAgent.util.matchUserAgent('Gecko') &&
+      !goog.labs.userAgent.engine.isWebKit() &&
+      !goog.labs.userAgent.engine.isTrident() &&
+      !goog.labs.userAgent.engine.isEdge();
+};
+
+
+/**
+ * @return {string} The rendering engine's version or empty string if version
+ *     can't be determined.
+ */
+goog.labs.userAgent.engine.getVersion = function() {
+  var userAgentString = goog.labs.userAgent.util.getUserAgent();
+  if (userAgentString) {
+    var tuples = goog.labs.userAgent.util.extractVersionTuples(
+        userAgentString);
+
+    var engineTuple = goog.labs.userAgent.engine.getEngineTuple_(tuples);
+    if (engineTuple) {
+      // In Gecko, the version string is either in the browser info or the
+      // Firefox version.  See Gecko user agent string reference:
+      // http://goo.gl/mULqa
+      if (engineTuple[0] == 'Gecko') {
+        return goog.labs.userAgent.engine.getVersionForKey_(
+            tuples, 'Firefox');
+      }
+
+      return engineTuple[1];
+    }
+
+    // MSIE has only one version identifier, and the Trident version is
+    // specified in the parenthetical. IE Edge is covered in the engine tuple
+    // detection.
+    var browserTuple = tuples[0];
+    var info;
+    if (browserTuple && (info = browserTuple[2])) {
+      var match = /Trident\/([^\s;]+)/.exec(info);
+      if (match) {
+        return match[1];
+      }
+    }
+  }
+  return '';
+};
+
+
+/**
+ * @param {!Array<!Array<string>>} tuples Extracted version tuples.
+ * @return {!Array<string>|undefined} The engine tuple or undefined if not
+ *     found.
+ * @private
+ */
+goog.labs.userAgent.engine.getEngineTuple_ = function(tuples) {
+  if (!goog.labs.userAgent.engine.isEdge()) {
+    return tuples[1];
+  }
+  for (var i = 0; i < tuples.length; i++) {
+    var tuple = tuples[i];
+    if (tuple[0] == 'Edge') {
+      return tuple;
+    }
+  }
+};
+
+
+/**
+ * @param {string|number} version The version to check.
+ * @return {boolean} Whether the rendering engine version is higher or the same
+ *     as the given version.
+ */
+goog.labs.userAgent.engine.isVersionOrHigher = function(version) {
+  return goog.string.compareVersions(goog.labs.userAgent.engine.getVersion(),
+                                     version) >= 0;
+};
+
+
+/**
+ * @param {!Array<!Array<string>>} tuples Version tuples.
+ * @param {string} key The key to look for.
+ * @return {string} The version string of the given key, if present.
+ *     Otherwise, the empty string.
+ * @private
+ */
+goog.labs.userAgent.engine.getVersionForKey_ = function(tuples, key) {
+  // TODO(nnaze): Move to util if useful elsewhere.
+
+  var pair = goog.array.find(tuples, function(pair) {
+    return key == pair[0];
+  });
+
+  return pair && pair[1] || '';
+};
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Closure user agent platform detection.
+ * @see <a href="http://www.useragentstring.com/">User agent strings</a>
+ * For more information on browser brand, rendering engine, or device see the
+ * other sub-namespaces in goog.labs.userAgent (browser, engine, and device
+ * respectively).
+ *
+ */
+
+goog.provide('goog.labs.userAgent.platform');
+
+goog.require('goog.labs.userAgent.util');
+goog.require('goog.string');
+
+
+/**
+ * @return {boolean} Whether the platform is Android.
+ */
+goog.labs.userAgent.platform.isAndroid = function() {
+  return goog.labs.userAgent.util.matchUserAgent('Android');
+};
+
+
+/**
+ * @return {boolean} Whether the platform is iPod.
+ */
+goog.labs.userAgent.platform.isIpod = function() {
+  return goog.labs.userAgent.util.matchUserAgent('iPod');
+};
+
+
+/**
+ * @return {boolean} Whether the platform is iPhone.
+ */
+goog.labs.userAgent.platform.isIphone = function() {
+  return goog.labs.userAgent.util.matchUserAgent('iPhone') &&
+      !goog.labs.userAgent.util.matchUserAgent('iPod') &&
+      !goog.labs.userAgent.util.matchUserAgent('iPad');
+};
+
+
+/**
+ * @return {boolean} Whether the platform is iPad.
+ */
+goog.labs.userAgent.platform.isIpad = function() {
+  return goog.labs.userAgent.util.matchUserAgent('iPad');
+};
+
+
+/**
+ * @return {boolean} Whether the platform is iOS.
+ */
+goog.labs.userAgent.platform.isIos = function() {
+  return goog.labs.userAgent.platform.isIphone() ||
+      goog.labs.userAgent.platform.isIpad() ||
+      goog.labs.userAgent.platform.isIpod();
+};
+
+
+/**
+ * @return {boolean} Whether the platform is Mac.
+ */
+goog.labs.userAgent.platform.isMacintosh = function() {
+  return goog.labs.userAgent.util.matchUserAgent('Macintosh');
+};
+
+
+/**
+ * Note: ChromeOS is not considered to be Linux as it does not report itself
+ * as Linux in the user agent string.
+ * @return {boolean} Whether the platform is Linux.
+ */
+goog.labs.userAgent.platform.isLinux = function() {
+  return goog.labs.userAgent.util.matchUserAgent('Linux');
+};
+
+
+/**
+ * @return {boolean} Whether the platform is Windows.
+ */
+goog.labs.userAgent.platform.isWindows = function() {
+  return goog.labs.userAgent.util.matchUserAgent('Windows');
+};
+
+
+/**
+ * @return {boolean} Whether the platform is ChromeOS.
+ */
+goog.labs.userAgent.platform.isChromeOS = function() {
+  return goog.labs.userAgent.util.matchUserAgent('CrOS');
+};
+
+
+/**
+ * The version of the platform. We only determine the version for Windows,
+ * Mac, and Chrome OS. It doesn't make much sense on Linux. For Windows, we only
+ * look at the NT version. Non-NT-based versions (e.g. 95, 98, etc.) are given
+ * version 0.0.
+ *
+ * @return {string} The platform version or empty string if version cannot be
+ *     determined.
+ */
+goog.labs.userAgent.platform.getVersion = function() {
+  var userAgentString = goog.labs.userAgent.util.getUserAgent();
+  var version = '', re;
+  if (goog.labs.userAgent.platform.isWindows()) {
+    re = /Windows (?:NT|Phone) ([0-9.]+)/;
+    var match = re.exec(userAgentString);
+    if (match) {
+      version = match[1];
+    } else {
+      version = '0.0';
+    }
+  } else if (goog.labs.userAgent.platform.isIos()) {
+    re = /(?:iPhone|iPod|iPad|CPU)\s+OS\s+(\S+)/;
+    var match = re.exec(userAgentString);
+    // Report the version as x.y.z and not x_y_z
+    version = match && match[1].replace(/_/g, '.');
+  } else if (goog.labs.userAgent.platform.isMacintosh()) {
+    re = /Mac OS X ([0-9_.]+)/;
+    var match = re.exec(userAgentString);
+    // Note: some old versions of Camino do not report an OSX version.
+    // Default to 10.
+    version = match ? match[1].replace(/_/g, '.') : '10';
+  } else if (goog.labs.userAgent.platform.isAndroid()) {
+    re = /Android\s+([^\);]+)(\)|;)/;
+    var match = re.exec(userAgentString);
+    version = match && match[1];
+  } else if (goog.labs.userAgent.platform.isChromeOS()) {
+    re = /(?:CrOS\s+(?:i686|x86_64)\s+([0-9.]+))/;
+    var match = re.exec(userAgentString);
+    version = match && match[1];
+  }
+  return version || '';
+};
+
+
+/**
+ * @param {string|number} version The version to check.
+ * @return {boolean} Whether the browser version is higher or the same as the
+ *     given version.
+ */
+goog.labs.userAgent.platform.isVersionOrHigher = function(version) {
+  return goog.string.compareVersions(goog.labs.userAgent.platform.getVersion(),
+                                     version) >= 0;
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Rendering engine detection.
+ * @see <a href="http://www.useragentstring.com/">User agent strings</a>
+ * For information on the browser brand (such as Safari versus Chrome), see
+ * goog.userAgent.product.
+ * @author arv@google.com (Erik Arvidsson)
+ * @see ../demos/useragent.html
+ */
+
+goog.provide('goog.userAgent');
+
+goog.require('goog.labs.userAgent.browser');
+goog.require('goog.labs.userAgent.engine');
+goog.require('goog.labs.userAgent.platform');
+goog.require('goog.labs.userAgent.util');
+goog.require('goog.string');
+
+
+/**
+ * @define {boolean} Whether we know at compile-time that the browser is IE.
+ */
+goog.define('goog.userAgent.ASSUME_IE', false);
+
+
+/**
+ * @define {boolean} Whether we know at compile-time that the browser is EDGE.
+ */
+goog.define('goog.userAgent.ASSUME_EDGE', false);
+
+
+/**
+ * @define {boolean} Whether we know at compile-time that the browser is GECKO.
+ */
+goog.define('goog.userAgent.ASSUME_GECKO', false);
+
+
+/**
+ * @define {boolean} Whether we know at compile-time that the browser is WEBKIT.
+ */
+goog.define('goog.userAgent.ASSUME_WEBKIT', false);
+
+
+/**
+ * @define {boolean} Whether we know at compile-time that the browser is a
+ *     mobile device running WebKit e.g. iPhone or Android.
+ */
+goog.define('goog.userAgent.ASSUME_MOBILE_WEBKIT', false);
+
+
+/**
+ * @define {boolean} Whether we know at compile-time that the browser is OPERA.
+ */
+goog.define('goog.userAgent.ASSUME_OPERA', false);
+
+
+/**
+ * @define {boolean} Whether the
+ *     {@code goog.userAgent.isVersionOrHigher}
+ *     function will return true for any version.
+ */
+goog.define('goog.userAgent.ASSUME_ANY_VERSION', false);
+
+
+/**
+ * Whether we know the browser engine at compile-time.
+ * @type {boolean}
+ * @private
+ */
+goog.userAgent.BROWSER_KNOWN_ =
+    goog.userAgent.ASSUME_IE ||
+    goog.userAgent.ASSUME_EDGE ||
+    goog.userAgent.ASSUME_GECKO ||
+    goog.userAgent.ASSUME_MOBILE_WEBKIT ||
+    goog.userAgent.ASSUME_WEBKIT ||
+    goog.userAgent.ASSUME_OPERA;
+
+
+/**
+ * Returns the userAgent string for the current browser.
+ *
+ * @return {string} The userAgent string.
+ */
+goog.userAgent.getUserAgentString = function() {
+  return goog.labs.userAgent.util.getUserAgent();
+};
+
+
+/**
+ * TODO(nnaze): Change type to "Navigator" and update compilation targets.
+ * @return {Object} The native navigator object.
+ */
+goog.userAgent.getNavigator = function() {
+  // Need a local navigator reference instead of using the global one,
+  // to avoid the rare case where they reference different objects.
+  // (in a WorkerPool, for example).
+  return goog.global['navigator'] || null;
+};
+
+
+/**
+ * Whether the user agent is Opera.
+ * @type {boolean}
+ */
+goog.userAgent.OPERA = goog.userAgent.BROWSER_KNOWN_ ?
+    goog.userAgent.ASSUME_OPERA :
+    goog.labs.userAgent.browser.isOpera();
+
+
+/**
+ * Whether the user agent is Internet Explorer.
+ * @type {boolean}
+ */
+goog.userAgent.IE = goog.userAgent.BROWSER_KNOWN_ ?
+    goog.userAgent.ASSUME_IE :
+    goog.labs.userAgent.browser.isIE();
+
+
+/**
+ * Whether the user agent is Microsoft Edge.
+ * @type {boolean}
+ */
+goog.userAgent.EDGE = goog.userAgent.BROWSER_KNOWN_ ?
+    goog.userAgent.ASSUME_EDGE :
+    goog.labs.userAgent.engine.isEdge();
+
+
+/**
+ * Whether the user agent is MS Internet Explorer or MS Edge.
+ * @type {boolean}
+ */
+goog.userAgent.EDGE_OR_IE = goog.userAgent.EDGE || goog.userAgent.IE;
+
+
+/**
+ * Whether the user agent is Gecko. Gecko is the rendering engine used by
+ * Mozilla, Firefox, and others.
+ * @type {boolean}
+ */
+goog.userAgent.GECKO = goog.userAgent.BROWSER_KNOWN_ ?
+    goog.userAgent.ASSUME_GECKO :
+    goog.labs.userAgent.engine.isGecko();
+
+
+/**
+ * Whether the user agent is WebKit. WebKit is the rendering engine that
+ * Safari, Android and others use.
+ * @type {boolean}
+ */
+goog.userAgent.WEBKIT = goog.userAgent.BROWSER_KNOWN_ ?
+    goog.userAgent.ASSUME_WEBKIT || goog.userAgent.ASSUME_MOBILE_WEBKIT :
+    goog.labs.userAgent.engine.isWebKit();
+
+
+/**
+ * Whether the user agent is running on a mobile device.
+ *
+ * This is a separate function so that the logic can be tested.
+ *
+ * TODO(nnaze): Investigate swapping in goog.labs.userAgent.device.isMobile().
+ *
+ * @return {boolean} Whether the user agent is running on a mobile device.
+ * @private
+ */
+goog.userAgent.isMobile_ = function() {
+  return goog.userAgent.WEBKIT &&
+         goog.labs.userAgent.util.matchUserAgent('Mobile');
+};
+
+
+/**
+ * Whether the user agent is running on a mobile device.
+ *
+ * TODO(nnaze): Consider deprecating MOBILE when labs.userAgent
+ *   is promoted as the gecko/webkit logic is likely inaccurate.
+ *
+ * @type {boolean}
+ */
+goog.userAgent.MOBILE = goog.userAgent.ASSUME_MOBILE_WEBKIT ||
+                        goog.userAgent.isMobile_();
+
+
+/**
+ * Used while transitioning code to use WEBKIT instead.
+ * @type {boolean}
+ * @deprecated Use {@link goog.userAgent.product.SAFARI} instead.
+ * TODO(nicksantos): Delete this from goog.userAgent.
+ */
+goog.userAgent.SAFARI = goog.userAgent.WEBKIT;
+
+
+/**
+ * @return {string} the platform (operating system) the user agent is running
+ *     on. Default to empty string because navigator.platform may not be defined
+ *     (on Rhino, for example).
+ * @private
+ */
+goog.userAgent.determinePlatform_ = function() {
+  var navigator = goog.userAgent.getNavigator();
+  return navigator && navigator.platform || '';
+};
+
+
+/**
+ * The platform (operating system) the user agent is running on. Default to
+ * empty string because navigator.platform may not be defined (on Rhino, for
+ * example).
+ * @type {string}
+ */
+goog.userAgent.PLATFORM = goog.userAgent.determinePlatform_();
+
+
+/**
+ * @define {boolean} Whether the user agent is running on a Macintosh operating
+ *     system.
+ */
+goog.define('goog.userAgent.ASSUME_MAC', false);
+
+
+/**
+ * @define {boolean} Whether the user agent is running on a Windows operating
+ *     system.
+ */
+goog.define('goog.userAgent.ASSUME_WINDOWS', false);
+
+
+/**
+ * @define {boolean} Whether the user agent is running on a Linux operating
+ *     system.
+ */
+goog.define('goog.userAgent.ASSUME_LINUX', false);
+
+
+/**
+ * @define {boolean} Whether the user agent is running on a X11 windowing
+ *     system.
+ */
+goog.define('goog.userAgent.ASSUME_X11', false);
+
+
+/**
+ * @define {boolean} Whether the user agent is running on Android.
+ */
+goog.define('goog.userAgent.ASSUME_ANDROID', false);
+
+
+/**
+ * @define {boolean} Whether the user agent is running on an iPhone.
+ */
+goog.define('goog.userAgent.ASSUME_IPHONE', false);
+
+
+/**
+ * @define {boolean} Whether the user agent is running on an iPad.
+ */
+goog.define('goog.userAgent.ASSUME_IPAD', false);
+
+
+/**
+ * @type {boolean}
+ * @private
+ */
+goog.userAgent.PLATFORM_KNOWN_ =
+    goog.userAgent.ASSUME_MAC ||
+    goog.userAgent.ASSUME_WINDOWS ||
+    goog.userAgent.ASSUME_LINUX ||
+    goog.userAgent.ASSUME_X11 ||
+    goog.userAgent.ASSUME_ANDROID ||
+    goog.userAgent.ASSUME_IPHONE ||
+    goog.userAgent.ASSUME_IPAD;
+
+
+/**
+ * Whether the user agent is running on a Macintosh operating system.
+ * @type {boolean}
+ */
+goog.userAgent.MAC = goog.userAgent.PLATFORM_KNOWN_ ?
+    goog.userAgent.ASSUME_MAC : goog.labs.userAgent.platform.isMacintosh();
+
+
+/**
+ * Whether the user agent is running on a Windows operating system.
+ * @type {boolean}
+ */
+goog.userAgent.WINDOWS = goog.userAgent.PLATFORM_KNOWN_ ?
+    goog.userAgent.ASSUME_WINDOWS :
+    goog.labs.userAgent.platform.isWindows();
+
+
+/**
+ * Whether the user agent is Linux per the legacy behavior of
+ * goog.userAgent.LINUX, which considered ChromeOS to also be
+ * Linux.
+ * @return {boolean}
+ * @private
+ */
+goog.userAgent.isLegacyLinux_ = function() {
+  return goog.labs.userAgent.platform.isLinux() ||
+      goog.labs.userAgent.platform.isChromeOS();
+};
+
+
+/**
+ * Whether the user agent is running on a Linux operating system.
+ *
+ * Note that goog.userAgent.LINUX considers ChromeOS to be Linux,
+ * while goog.labs.userAgent.platform considers ChromeOS and
+ * Linux to be different OSes.
+ *
+ * @type {boolean}
+ */
+goog.userAgent.LINUX = goog.userAgent.PLATFORM_KNOWN_ ?
+    goog.userAgent.ASSUME_LINUX :
+    goog.userAgent.isLegacyLinux_();
+
+
+/**
+ * @return {boolean} Whether the user agent is an X11 windowing system.
+ * @private
+ */
+goog.userAgent.isX11_ = function() {
+  var navigator = goog.userAgent.getNavigator();
+  return !!navigator &&
+      goog.string.contains(navigator['appVersion'] || '', 'X11');
+};
+
+
+/**
+ * Whether the user agent is running on a X11 windowing system.
+ * @type {boolean}
+ */
+goog.userAgent.X11 = goog.userAgent.PLATFORM_KNOWN_ ?
+    goog.userAgent.ASSUME_X11 :
+    goog.userAgent.isX11_();
+
+
+/**
+ * Whether the user agent is running on Android.
+ * @type {boolean}
+ */
+goog.userAgent.ANDROID = goog.userAgent.PLATFORM_KNOWN_ ?
+    goog.userAgent.ASSUME_ANDROID :
+    goog.labs.userAgent.platform.isAndroid();
+
+
+/**
+ * Whether the user agent is running on an iPhone.
+ * @type {boolean}
+ */
+goog.userAgent.IPHONE = goog.userAgent.PLATFORM_KNOWN_ ?
+    goog.userAgent.ASSUME_IPHONE :
+    goog.labs.userAgent.platform.isIphone();
+
+
+/**
+ * Whether the user agent is running on an iPad.
+ * @type {boolean}
+ */
+goog.userAgent.IPAD = goog.userAgent.PLATFORM_KNOWN_ ?
+    goog.userAgent.ASSUME_IPAD :
+    goog.labs.userAgent.platform.isIpad();
+
+
+/**
+ * @return {string} The string that describes the version number of the user
+ *     agent.
+ * Assumes user agent is opera.
+ * @private
+ */
+goog.userAgent.operaVersion_ = function() {
+  var version = goog.global.opera.version;
+  try {
+    return version();
+  } catch (e) {
+    return version;
+  }
+};
+
+
+/**
+ * @return {string} The string that describes the version number of the user
+ *     agent.
+ * @private
+ */
+goog.userAgent.determineVersion_ = function() {
+  // All browsers have different ways to detect the version and they all have
+  // different naming schemes.
+
+  if (goog.userAgent.OPERA && goog.global['opera']) {
+    return goog.userAgent.operaVersion_();
+  }
+
+  // version is a string rather than a number because it may contain 'b', 'a',
+  // and so on.
+  var version = '';
+  var arr = goog.userAgent.getVersionRegexResult_();
+  if (arr) {
+    version = arr ? arr[1] : '';
+  }
+
+  if (goog.userAgent.IE) {
+    // IE9 can be in document mode 9 but be reporting an inconsistent user agent
+    // version.  If it is identifying as a version lower than 9 we take the
+    // documentMode as the version instead.  IE8 has similar behavior.
+    // It is recommended to set the X-UA-Compatible header to ensure that IE9
+    // uses documentMode 9.
+    var docMode = goog.userAgent.getDocumentMode_();
+    if (docMode > parseFloat(version)) {
+      return String(docMode);
+    }
+  }
+
+  return version;
+};
+
+
+/**
+ * @return {Array|undefined} The version regex matches from parsing the user
+ *     agent string. These regex statements must be executed inline so they can
+ *     be compiled out by the closure compiler with the rest of the useragent
+ *     detection logic when ASSUME_* is specified.
+ * @private
+ */
+goog.userAgent.getVersionRegexResult_ = function() {
+  var userAgent = goog.userAgent.getUserAgentString();
+  if (goog.userAgent.GECKO) {
+    return /rv\:([^\);]+)(\)|;)/.exec(userAgent);
+  }
+  if (goog.userAgent.EDGE) {
+    return /Edge\/([\d\.]+)/.exec(userAgent);
+  }
+  if (goog.userAgent.IE) {
+    return /\b(?:MSIE|rv)[: ]([^\);]+)(\)|;)/.exec(userAgent);
+  }
+  if (goog.userAgent.WEBKIT) {
+    // WebKit/125.4
+    return /WebKit\/(\S+)/.exec(userAgent);
+  }
+};
+
+
+/**
+ * @return {number|undefined} Returns the document mode (for testing).
+ * @private
+ */
+goog.userAgent.getDocumentMode_ = function() {
+  // NOTE(user): goog.userAgent may be used in context where there is no DOM.
+  var doc = goog.global['document'];
+  return doc ? doc['documentMode'] : undefined;
+};
+
+
+/**
+ * The version of the user agent. This is a string because it might contain
+ * 'b' (as in beta) as well as multiple dots.
+ * @type {string}
+ */
+goog.userAgent.VERSION = goog.userAgent.determineVersion_();
+
+
+/**
+ * Compares two version numbers.
+ *
+ * @param {string} v1 Version of first item.
+ * @param {string} v2 Version of second item.
+ *
+ * @return {number}  1 if first argument is higher
+ *                   0 if arguments are equal
+ *                  -1 if second argument is higher.
+ * @deprecated Use goog.string.compareVersions.
+ */
+goog.userAgent.compare = function(v1, v2) {
+  return goog.string.compareVersions(v1, v2);
+};
+
+
+/**
+ * Cache for {@link goog.userAgent.isVersionOrHigher}.
+ * Calls to compareVersions are surprisingly expensive and, as a browser's
+ * version number is unlikely to change during a session, we cache the results.
+ * @const
+ * @private
+ */
+goog.userAgent.isVersionOrHigherCache_ = {};
+
+
+/**
+ * Whether the user agent version is higher or the same as the given version.
+ * NOTE: When checking the version numbers for Firefox and Safari, be sure to
+ * use the engine's version, not the browser's version number.  For example,
+ * Firefox 3.0 corresponds to Gecko 1.9 and Safari 3.0 to Webkit 522.11.
+ * Opera and Internet Explorer versions match the product release number.<br>
+ * @see <a href="http://en.wikipedia.org/wiki/Safari_version_history">
+ *     Webkit</a>
+ * @see <a href="http://en.wikipedia.org/wiki/Gecko_engine">Gecko</a>
+ *
+ * @param {string|number} version The version to check.
+ * @return {boolean} Whether the user agent version is higher or the same as
+ *     the given version.
+ */
+goog.userAgent.isVersionOrHigher = function(version) {
+  return goog.userAgent.ASSUME_ANY_VERSION ||
+      goog.userAgent.isVersionOrHigherCache_[version] ||
+      (goog.userAgent.isVersionOrHigherCache_[version] =
+          goog.string.compareVersions(goog.userAgent.VERSION, version) >= 0);
+};
+
+
+/**
+ * Deprecated alias to {@code goog.userAgent.isVersionOrHigher}.
+ * @param {string|number} version The version to check.
+ * @return {boolean} Whether the user agent version is higher or the same as
+ *     the given version.
+ * @deprecated Use goog.userAgent.isVersionOrHigher().
+ */
+goog.userAgent.isVersion = goog.userAgent.isVersionOrHigher;
+
+
+/**
+ * Whether the IE effective document mode is higher or the same as the given
+ * document mode version.
+ * NOTE: Only for IE, return false for another browser.
+ *
+ * @param {number} documentMode The document mode version to check.
+ * @return {boolean} Whether the IE effective document mode is higher or the
+ *     same as the given version.
+ */
+goog.userAgent.isDocumentModeOrHigher = function(documentMode) {
+  return goog.userAgent.DOCUMENT_MODE >= documentMode;
+};
+
+
+/**
+ * Deprecated alias to {@code goog.userAgent.isDocumentModeOrHigher}.
+ * @param {number} version The version to check.
+ * @return {boolean} Whether the IE effective document mode is higher or the
+ *      same as the given version.
+ * @deprecated Use goog.userAgent.isDocumentModeOrHigher().
+ */
+goog.userAgent.isDocumentMode = goog.userAgent.isDocumentModeOrHigher;
+
+
+/**
+ * For IE version < 7, documentMode is undefined, so attempt to use the
+ * CSS1Compat property to see if we are in standards mode. If we are in
+ * standards mode, treat the browser version as the document mode. Otherwise,
+ * IE is emulating version 5.
+ * @type {number|undefined}
+ * @const
+ */
+goog.userAgent.DOCUMENT_MODE = (function() {
+  var doc = goog.global['document'];
+  var mode = goog.userAgent.getDocumentMode_();
+  if (!doc || !goog.userAgent.IE) {
+    return undefined;
+  }
+  return mode || (doc['compatMode'] == 'CSS1Compat' ?
+      parseInt(goog.userAgent.VERSION, 10) : 5);
+})();
+
+// Copyright 2010 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Browser capability checks for the events package.
+ *
+ */
+
+
+goog.provide('goog.events.BrowserFeature');
+
+goog.require('goog.userAgent');
+
+
+/**
+ * Enum of browser capabilities.
+ * @enum {boolean}
+ */
+goog.events.BrowserFeature = {
+  /**
+   * Whether the button attribute of the event is W3C compliant.  False in
+   * Internet Explorer prior to version 9; document-version dependent.
+   */
+  HAS_W3C_BUTTON: !goog.userAgent.IE ||
+      goog.userAgent.isDocumentModeOrHigher(9),
+
+  /**
+   * Whether the browser supports full W3C event model.
+   */
+  HAS_W3C_EVENT_SUPPORT: !goog.userAgent.IE ||
+      goog.userAgent.isDocumentModeOrHigher(9),
+
+  /**
+   * To prevent default in IE7-8 for certain keydown events we need set the
+   * keyCode to -1.
+   */
+  SET_KEY_CODE_TO_PREVENT_DEFAULT: goog.userAgent.IE &&
+      !goog.userAgent.isVersionOrHigher('9'),
+
+  /**
+   * Whether the {@code navigator.onLine} property is supported.
+   */
+  HAS_NAVIGATOR_ONLINE_PROPERTY: !goog.userAgent.WEBKIT ||
+      goog.userAgent.isVersionOrHigher('528'),
+
+  /**
+   * Whether HTML5 network online/offline events are supported.
+   */
+  HAS_HTML5_NETWORK_EVENT_SUPPORT:
+      goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9b') ||
+      goog.userAgent.IE && goog.userAgent.isVersionOrHigher('8') ||
+      goog.userAgent.OPERA && goog.userAgent.isVersionOrHigher('9.5') ||
+      goog.userAgent.WEBKIT && goog.userAgent.isVersionOrHigher('528'),
+
+  /**
+   * Whether HTML5 network events fire on document.body, or otherwise the
+   * window.
+   */
+  HTML5_NETWORK_EVENTS_FIRE_ON_BODY:
+      goog.userAgent.GECKO && !goog.userAgent.isVersionOrHigher('8') ||
+      goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('9'),
+
+  /**
+   * Whether touch is enabled in the browser.
+   */
+  TOUCH_ENABLED:
+      ('ontouchstart' in goog.global ||
+          !!(goog.global['document'] &&
+             document.documentElement &&
+             'ontouchstart' in document.documentElement) ||
+          // IE10 uses non-standard touch events, so it has a different check.
+          !!(goog.global['navigator'] &&
+              goog.global['navigator']['msMaxTouchPoints']))
+};
+
+// Copyright 2011 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Definition of the disposable interface.  A disposable object
+ * has a dispose method to to clean up references and resources.
+ * @author nnaze@google.com (Nathan Naze)
+ */
+
+
+goog.provide('goog.disposable.IDisposable');
+
+
+
+/**
+ * Interface for a disposable object.  If a instance requires cleanup
+ * (references COM objects, DOM notes, or other disposable objects), it should
+ * implement this interface (it may subclass goog.Disposable).
+ * @interface
+ */
+goog.disposable.IDisposable = function() {};
+
+
+/**
+ * Disposes of the object and its resources.
+ * @return {void} Nothing.
+ */
+goog.disposable.IDisposable.prototype.dispose = goog.abstractMethod;
+
+
+/**
+ * @return {boolean} Whether the object has been disposed of.
+ */
+goog.disposable.IDisposable.prototype.isDisposed = goog.abstractMethod;
+
+// Copyright 2005 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Implements the disposable interface. The dispose method is used
+ * to clean up references and resources.
+ * @author arv@google.com (Erik Arvidsson)
+ */
+
+
+goog.provide('goog.Disposable');
+/** @suppress {extraProvide} */
+goog.provide('goog.dispose');
+/** @suppress {extraProvide} */
+goog.provide('goog.disposeAll');
+
+goog.require('goog.disposable.IDisposable');
+
+
+
+/**
+ * Class that provides the basic implementation for disposable objects. If your
+ * class holds one or more references to COM objects, DOM nodes, or other
+ * disposable objects, it should extend this class or implement the disposable
+ * interface (defined in goog.disposable.IDisposable).
+ * @constructor
+ * @implements {goog.disposable.IDisposable}
+ */
+goog.Disposable = function() {
+  if (goog.Disposable.MONITORING_MODE != goog.Disposable.MonitoringMode.OFF) {
+    if (goog.Disposable.INCLUDE_STACK_ON_CREATION) {
+      this.creationStack = new Error().stack;
+    }
+    goog.Disposable.instances_[goog.getUid(this)] = this;
+  }
+  // Support sealing
+  this.disposed_ = this.disposed_;
+  this.onDisposeCallbacks_ = this.onDisposeCallbacks_;
+};
+
+
+/**
+ * @enum {number} Different monitoring modes for Disposable.
+ */
+goog.Disposable.MonitoringMode = {
+  /**
+   * No monitoring.
+   */
+  OFF: 0,
+  /**
+   * Creating and disposing the goog.Disposable instances is monitored. All
+   * disposable objects need to call the {@code goog.Disposable} base
+   * constructor. The PERMANENT mode must be switched on before creating any
+   * goog.Disposable instances.
+   */
+  PERMANENT: 1,
+  /**
+   * INTERACTIVE mode can be switched on and off on the fly without producing
+   * errors. It also doesn't warn if the disposable objects don't call the
+   * {@code goog.Disposable} base constructor.
+   */
+  INTERACTIVE: 2
+};
+
+
+/**
+ * @define {number} The monitoring mode of the goog.Disposable
+ *     instances. Default is OFF. Switching on the monitoring is only
+ *     recommended for debugging because it has a significant impact on
+ *     performance and memory usage. If switched off, the monitoring code
+ *     compiles down to 0 bytes.
+ */
+goog.define('goog.Disposable.MONITORING_MODE', 0);
+
+
+/**
+ * @define {boolean} Whether to attach creation stack to each created disposable
+ *     instance; This is only relevant for when MonitoringMode != OFF.
+ */
+goog.define('goog.Disposable.INCLUDE_STACK_ON_CREATION', true);
+
+
+/**
+ * Maps the unique ID of every undisposed {@code goog.Disposable} object to
+ * the object itself.
+ * @type {!Object<number, !goog.Disposable>}
+ * @private
+ */
+goog.Disposable.instances_ = {};
+
+
+/**
+ * @return {!Array<!goog.Disposable>} All {@code goog.Disposable} objects that
+ *     haven't been disposed of.
+ */
+goog.Disposable.getUndisposedObjects = function() {
+  var ret = [];
+  for (var id in goog.Disposable.instances_) {
+    if (goog.Disposable.instances_.hasOwnProperty(id)) {
+      ret.push(goog.Disposable.instances_[Number(id)]);
+    }
+  }
+  return ret;
+};
+
+
+/**
+ * Clears the registry of undisposed objects but doesn't dispose of them.
+ */
+goog.Disposable.clearUndisposedObjects = function() {
+  goog.Disposable.instances_ = {};
+};
+
+
+/**
+ * Whether the object has been disposed of.
+ * @type {boolean}
+ * @private
+ */
+goog.Disposable.prototype.disposed_ = false;
+
+
+/**
+ * Callbacks to invoke when this object is disposed.
+ * @type {Array<!Function>}
+ * @private
+ */
+goog.Disposable.prototype.onDisposeCallbacks_;
+
+
+/**
+ * If monitoring the goog.Disposable instances is enabled, stores the creation
+ * stack trace of the Disposable instance.
+ * @const {string}
+ */
+goog.Disposable.prototype.creationStack;
+
+
+/**
+ * @return {boolean} Whether the object has been disposed of.
+ * @override
+ */
+goog.Disposable.prototype.isDisposed = function() {
+  return this.disposed_;
+};
+
+
+/**
+ * @return {boolean} Whether the object has been disposed of.
+ * @deprecated Use {@link #isDisposed} instead.
+ */
+goog.Disposable.prototype.getDisposed = goog.Disposable.prototype.isDisposed;
+
+
+/**
+ * Disposes of the object. If the object hasn't already been disposed of, calls
+ * {@link #disposeInternal}. Classes that extend {@code goog.Disposable} should
+ * override {@link #disposeInternal} in order to delete references to COM
+ * objects, DOM nodes, and other disposable objects. Reentrant.
+ *
+ * @return {void} Nothing.
+ * @override
+ */
+goog.Disposable.prototype.dispose = function() {
+  if (!this.disposed_) {
+    // Set disposed_ to true first, in case during the chain of disposal this
+    // gets disposed recursively.
+    this.disposed_ = true;
+    this.disposeInternal();
+    if (goog.Disposable.MONITORING_MODE != goog.Disposable.MonitoringMode.OFF) {
+      var uid = goog.getUid(this);
+      if (goog.Disposable.MONITORING_MODE ==
+          goog.Disposable.MonitoringMode.PERMANENT &&
+          !goog.Disposable.instances_.hasOwnProperty(uid)) {
+        throw Error(this + ' did not call the goog.Disposable base ' +
+            'constructor or was disposed of after a clearUndisposedObjects ' +
+            'call');
+      }
+      delete goog.Disposable.instances_[uid];
+    }
+  }
+};
+
+
+/**
+ * Associates a disposable object with this object so that they will be disposed
+ * together.
+ * @param {goog.disposable.IDisposable} disposable that will be disposed when
+ *     this object is disposed.
+ */
+goog.Disposable.prototype.registerDisposable = function(disposable) {
+  this.addOnDisposeCallback(goog.partial(goog.dispose, disposable));
+};
+
+
+/**
+ * Invokes a callback function when this object is disposed. Callbacks are
+ * invoked in the order in which they were added. If a callback is added to
+ * an already disposed Disposable, it will be called immediately.
+ * @param {function(this:T):?} callback The callback function.
+ * @param {T=} opt_scope An optional scope to call the callback in.
+ * @template T
+ */
+goog.Disposable.prototype.addOnDisposeCallback = function(callback, opt_scope) {
+  if (this.disposed_) {
+    callback.call(opt_scope);
+    return;
+  }
+  if (!this.onDisposeCallbacks_) {
+    this.onDisposeCallbacks_ = [];
+  }
+
+  this.onDisposeCallbacks_.push(
+      goog.isDef(opt_scope) ? goog.bind(callback, opt_scope) : callback);
+};
+
+
+/**
+ * Deletes or nulls out any references to COM objects, DOM nodes, or other
+ * disposable objects. Classes that extend {@code goog.Disposable} should
+ * override this method.
+ * Not reentrant. To avoid calling it twice, it must only be called from the
+ * subclass' {@code disposeInternal} method. Everywhere else the public
+ * {@code dispose} method must be used.
+ * For example:
+ * <pre>
+ *   mypackage.MyClass = function() {
+ *     mypackage.MyClass.base(this, 'constructor');
+ *     // Constructor logic specific to MyClass.
+ *     ...
+ *   };
+ *   goog.inherits(mypackage.MyClass, goog.Disposable);
+ *
+ *   mypackage.MyClass.prototype.disposeInternal = function() {
+ *     // Dispose logic specific to MyClass.
+ *     ...
+ *     // Call superclass's disposeInternal at the end of the subclass's, like
+ *     // in C++, to avoid hard-to-catch issues.
+ *     mypackage.MyClass.base(this, 'disposeInternal');
+ *   };
+ * </pre>
+ * @protected
+ */
+goog.Disposable.prototype.disposeInternal = function() {
+  if (this.onDisposeCallbacks_) {
+    while (this.onDisposeCallbacks_.length) {
+      this.onDisposeCallbacks_.shift()();
+    }
+  }
+};
+
+
+/**
+ * Returns True if we can verify the object is disposed.
+ * Calls {@code isDisposed} on the argument if it supports it.  If obj
+ * is not an object with an isDisposed() method, return false.
+ * @param {*} obj The object to investigate.
+ * @return {boolean} True if we can verify the object is disposed.
+ */
+goog.Disposable.isDisposed = function(obj) {
+  if (obj && typeof obj.isDisposed == 'function') {
+    return obj.isDisposed();
+  }
+  return false;
+};
+
+
+/**
+ * Calls {@code dispose} on the argument if it supports it. If obj is not an
+ *     object with a dispose() method, this is a no-op.
+ * @param {*} obj The object to dispose of.
+ */
+goog.dispose = function(obj) {
+  if (obj && typeof obj.dispose == 'function') {
+    obj.dispose();
+  }
+};
+
+
+/**
+ * Calls {@code dispose} on each member of the list that supports it. (If the
+ * member is an ArrayLike, then {@code goog.disposeAll()} will be called
+ * recursively on each of its members.) If the member is not an object with a
+ * {@code dispose()} method, then it is ignored.
+ * @param {...*} var_args The list.
+ */
+goog.disposeAll = function(var_args) {
+  for (var i = 0, len = arguments.length; i < len; ++i) {
+    var disposable = arguments[i];
+    if (goog.isArrayLike(disposable)) {
+      goog.disposeAll.apply(null, disposable);
+    } else {
+      goog.dispose(disposable);
+    }
+  }
+};
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+goog.provide('goog.events.EventId');
+
+
+
+/**
+ * A templated class that is used when registering for events. Typical usage:
+ * <code>
+ *   /** @type {goog.events.EventId<MyEventObj>}
+ *   var myEventId = new goog.events.EventId(
+ *       goog.events.getUniqueId(('someEvent'));
+ *
+ *   // No need to cast or declare here since the compiler knows the correct
+ *   // type of 'evt' (MyEventObj).
+ *   something.listen(myEventId, function(evt) {});
+ * </code>
+ *
+ * @param {string} eventId
+ * @template T
+ * @constructor
+ * @struct
+ * @final
+ */
+goog.events.EventId = function(eventId) {
+  /** @const */ this.id = eventId;
+};
+
+
+/**
+ * @override
+ */
+goog.events.EventId.prototype.toString = function() {
+  return this.id;
+};
+
+// Copyright 2005 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview A base class for event objects.
+ *
+ */
+
+
+goog.provide('goog.events.Event');
+goog.provide('goog.events.EventLike');
+
+/**
+ * goog.events.Event no longer depends on goog.Disposable. Keep requiring
+ * goog.Disposable here to not break projects which assume this dependency.
+ * @suppress {extraRequire}
+ */
+goog.require('goog.Disposable');
+goog.require('goog.events.EventId');
+
+
+/**
+ * A typedef for event like objects that are dispatchable via the
+ * goog.events.dispatchEvent function. strings are treated as the type for a
+ * goog.events.Event. Objects are treated as an extension of a new
+ * goog.events.Event with the type property of the object being used as the type
+ * of the Event.
+ * @typedef {string|Object|goog.events.Event|goog.events.EventId}
+ */
+goog.events.EventLike;
+
+
+
+/**
+ * A base class for event objects, so that they can support preventDefault and
+ * stopPropagation.
+ *
+ * @param {string|!goog.events.EventId} type Event Type.
+ * @param {Object=} opt_target Reference to the object that is the target of
+ *     this event. It has to implement the {@code EventTarget} interface
+ *     declared at {@link http://developer.mozilla.org/en/DOM/EventTarget}.
+ * @constructor
+ */
+goog.events.Event = function(type, opt_target) {
+  /**
+   * Event type.
+   * @type {string}
+   */
+  this.type = type instanceof goog.events.EventId ? String(type) : type;
+
+  /**
+   * TODO(tbreisacher): The type should probably be
+   * EventTarget|goog.events.EventTarget.
+   *
+   * Target of the event.
+   * @type {Object|undefined}
+   */
+  this.target = opt_target;
+
+  /**
+   * Object that had the listener attached.
+   * @type {Object|undefined}
+   */
+  this.currentTarget = this.target;
+
+  /**
+   * Whether to cancel the event in internal capture/bubble processing for IE.
+   * @type {boolean}
+   * @public
+   * @suppress {underscore|visibility} Technically public, but referencing this
+   *     outside this package is strongly discouraged.
+   */
+  this.propagationStopped_ = false;
+
+  /**
+   * Whether the default action has been prevented.
+   * This is a property to match the W3C specification at
+   * {@link http://www.w3.org/TR/DOM-Level-3-Events/
+   * #events-event-type-defaultPrevented}.
+   * Must be treated as read-only outside the class.
+   * @type {boolean}
+   */
+  this.defaultPrevented = false;
+
+  /**
+   * Return value for in internal capture/bubble processing for IE.
+   * @type {boolean}
+   * @public
+   * @suppress {underscore|visibility} Technically public, but referencing this
+   *     outside this package is strongly discouraged.
+   */
+  this.returnValue_ = true;
+};
+
+
+/**
+ * Stops event propagation.
+ */
+goog.events.Event.prototype.stopPropagation = function() {
+  this.propagationStopped_ = true;
+};
+
+
+/**
+ * Prevents the default action, for example a link redirecting to a url.
+ */
+goog.events.Event.prototype.preventDefault = function() {
+  this.defaultPrevented = true;
+  this.returnValue_ = false;
+};
+
+
+/**
+ * Stops the propagation of the event. It is equivalent to
+ * {@code e.stopPropagation()}, but can be used as the callback argument of
+ * {@link goog.events.listen} without declaring another function.
+ * @param {!goog.events.Event} e An event.
+ */
+goog.events.Event.stopPropagation = function(e) {
+  e.stopPropagation();
+};
+
+
+/**
+ * Prevents the default action. It is equivalent to
+ * {@code e.preventDefault()}, but can be used as the callback argument of
+ * {@link goog.events.listen} without declaring another function.
+ * @param {!goog.events.Event} e An event.
+ */
+goog.events.Event.preventDefault = function(e) {
+  e.preventDefault();
+};
+
+// Copyright 2010 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Event Types.
+ *
+ * @author arv@google.com (Erik Arvidsson)
+ */
+
+
+goog.provide('goog.events.EventType');
+
+goog.require('goog.userAgent');
+
+
+/**
+ * Returns a prefixed event name for the current browser.
+ * @param {string} eventName The name of the event.
+ * @return {string} The prefixed event name.
+ * @suppress {missingRequire|missingProvide}
+ * @private
+ */
+goog.events.getVendorPrefixedName_ = function(eventName) {
+  return goog.userAgent.WEBKIT ? 'webkit' + eventName :
+      (goog.userAgent.OPERA ? 'o' + eventName.toLowerCase() :
+          eventName.toLowerCase());
+};
+
+
+/**
+ * Constants for event names.
+ * @enum {string}
+ */
+goog.events.EventType = {
+  // Mouse events
+  CLICK: 'click',
+  RIGHTCLICK: 'rightclick',
+  DBLCLICK: 'dblclick',
+  MOUSEDOWN: 'mousedown',
+  MOUSEUP: 'mouseup',
+  MOUSEOVER: 'mouseover',
+  MOUSEOUT: 'mouseout',
+  MOUSEMOVE: 'mousemove',
+  MOUSEENTER: 'mouseenter',
+  MOUSELEAVE: 'mouseleave',
+  // Select start is non-standard.
+  // See http://msdn.microsoft.com/en-us/library/ie/ms536969(v=vs.85).aspx.
+  SELECTSTART: 'selectstart', // IE, Safari, Chrome
+
+  // Wheel events
+  // http://www.w3.org/TR/DOM-Level-3-Events/#events-wheelevents
+  WHEEL: 'wheel',
+
+  // Key events
+  KEYPRESS: 'keypress',
+  KEYDOWN: 'keydown',
+  KEYUP: 'keyup',
+
+  // Focus
+  BLUR: 'blur',
+  FOCUS: 'focus',
+  DEACTIVATE: 'deactivate', // IE only
+  // NOTE: The following two events are not stable in cross-browser usage.
+  //     WebKit and Opera implement DOMFocusIn/Out.
+  //     IE implements focusin/out.
+  //     Gecko implements neither see bug at
+  //     https://bugzilla.mozilla.org/show_bug.cgi?id=396927.
+  // The DOM Events Level 3 Draft deprecates DOMFocusIn in favor of focusin:
+  //     http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html
+  // You can use FOCUS in Capture phase until implementations converge.
+  FOCUSIN: goog.userAgent.IE ? 'focusin' : 'DOMFocusIn',
+  FOCUSOUT: goog.userAgent.IE ? 'focusout' : 'DOMFocusOut',
+
+  // Forms
+  CHANGE: 'change',
+  RESET: 'reset',
+  SELECT: 'select',
+  SUBMIT: 'submit',
+  INPUT: 'input',
+  PROPERTYCHANGE: 'propertychange', // IE only
+
+  // Drag and drop
+  DRAGSTART: 'dragstart',
+  DRAG: 'drag',
+  DRAGENTER: 'dragenter',
+  DRAGOVER: 'dragover',
+  DRAGLEAVE: 'dragleave',
+  DROP: 'drop',
+  DRAGEND: 'dragend',
+
+  // Touch events
+  // Note that other touch events exist, but we should follow the W3C list here.
+  // http://www.w3.org/TR/touch-events/#list-of-touchevent-types
+  TOUCHSTART: 'touchstart',
+  TOUCHMOVE: 'touchmove',
+  TOUCHEND: 'touchend',
+  TOUCHCANCEL: 'touchcancel',
+
+  // Misc
+  BEFOREUNLOAD: 'beforeunload',
+  CONSOLEMESSAGE: 'consolemessage',
+  CONTEXTMENU: 'contextmenu',
+  DOMCONTENTLOADED: 'DOMContentLoaded',
+  ERROR: 'error',
+  HELP: 'help',
+  LOAD: 'load',
+  LOSECAPTURE: 'losecapture',
+  ORIENTATIONCHANGE: 'orientationchange',
+  READYSTATECHANGE: 'readystatechange',
+  RESIZE: 'resize',
+  SCROLL: 'scroll',
+  UNLOAD: 'unload',
+
+  // HTML 5 History events
+  // See http://www.w3.org/TR/html5/browsers.html#event-definitions-0
+  HASHCHANGE: 'hashchange',
+  PAGEHIDE: 'pagehide',
+  PAGESHOW: 'pageshow',
+  POPSTATE: 'popstate',
+
+  // Copy and Paste
+  // Support is limited. Make sure it works on your favorite browser
+  // before using.
+  // http://www.quirksmode.org/dom/events/cutcopypaste.html
+  COPY: 'copy',
+  PASTE: 'paste',
+  CUT: 'cut',
+  BEFORECOPY: 'beforecopy',
+  BEFORECUT: 'beforecut',
+  BEFOREPASTE: 'beforepaste',
+
+  // HTML5 online/offline events.
+  // http://www.w3.org/TR/offline-webapps/#related
+  ONLINE: 'online',
+  OFFLINE: 'offline',
+
+  // HTML 5 worker events
+  MESSAGE: 'message',
+  CONNECT: 'connect',
+
+  // CSS animation events.
+  /** @suppress {missingRequire} */
+  ANIMATIONSTART: goog.events.getVendorPrefixedName_('AnimationStart'),
+  /** @suppress {missingRequire} */
+  ANIMATIONEND: goog.events.getVendorPrefixedName_('AnimationEnd'),
+  /** @suppress {missingRequire} */
+  ANIMATIONITERATION: goog.events.getVendorPrefixedName_('AnimationIteration'),
+
+  // CSS transition events. Based on the browser support described at:
+  // https://developer.mozilla.org/en/css/css_transitions#Browser_compatibility
+  /** @suppress {missingRequire} */
+  TRANSITIONEND: goog.events.getVendorPrefixedName_('TransitionEnd'),
+
+  // W3C Pointer Events
+  // http://www.w3.org/TR/pointerevents/
+  POINTERDOWN: 'pointerdown',
+  POINTERUP: 'pointerup',
+  POINTERCANCEL: 'pointercancel',
+  POINTERMOVE: 'pointermove',
+  POINTEROVER: 'pointerover',
+  POINTEROUT: 'pointerout',
+  POINTERENTER: 'pointerenter',
+  POINTERLEAVE: 'pointerleave',
+  GOTPOINTERCAPTURE: 'gotpointercapture',
+  LOSTPOINTERCAPTURE: 'lostpointercapture',
+
+  // IE specific events.
+  // See http://msdn.microsoft.com/en-us/library/ie/hh772103(v=vs.85).aspx
+  // Note: these events will be supplanted in IE11.
+  MSGESTURECHANGE: 'MSGestureChange',
+  MSGESTUREEND: 'MSGestureEnd',
+  MSGESTUREHOLD: 'MSGestureHold',
+  MSGESTURESTART: 'MSGestureStart',
+  MSGESTURETAP: 'MSGestureTap',
+  MSGOTPOINTERCAPTURE: 'MSGotPointerCapture',
+  MSINERTIASTART: 'MSInertiaStart',
+  MSLOSTPOINTERCAPTURE: 'MSLostPointerCapture',
+  MSPOINTERCANCEL: 'MSPointerCancel',
+  MSPOINTERDOWN: 'MSPointerDown',
+  MSPOINTERENTER: 'MSPointerEnter',
+  MSPOINTERHOVER: 'MSPointerHover',
+  MSPOINTERLEAVE: 'MSPointerLeave',
+  MSPOINTERMOVE: 'MSPointerMove',
+  MSPOINTEROUT: 'MSPointerOut',
+  MSPOINTEROVER: 'MSPointerOver',
+  MSPOINTERUP: 'MSPointerUp',
+
+  // Native IMEs/input tools events.
+  TEXT: 'text',
+  TEXTINPUT: 'textInput',
+  COMPOSITIONSTART: 'compositionstart',
+  COMPOSITIONUPDATE: 'compositionupdate',
+  COMPOSITIONEND: 'compositionend',
+
+  // Webview tag events
+  // See http://developer.chrome.com/dev/apps/webview_tag.html
+  EXIT: 'exit',
+  LOADABORT: 'loadabort',
+  LOADCOMMIT: 'loadcommit',
+  LOADREDIRECT: 'loadredirect',
+  LOADSTART: 'loadstart',
+  LOADSTOP: 'loadstop',
+  RESPONSIVE: 'responsive',
+  SIZECHANGED: 'sizechanged',
+  UNRESPONSIVE: 'unresponsive',
+
+  // HTML5 Page Visibility API.  See details at
+  // {@code goog.labs.dom.PageVisibilityMonitor}.
+  VISIBILITYCHANGE: 'visibilitychange',
+
+  // LocalStorage event.
+  STORAGE: 'storage',
+
+  // DOM Level 2 mutation events (deprecated).
+  DOMSUBTREEMODIFIED: 'DOMSubtreeModified',
+  DOMNODEINSERTED: 'DOMNodeInserted',
+  DOMNODEREMOVED: 'DOMNodeRemoved',
+  DOMNODEREMOVEDFROMDOCUMENT: 'DOMNodeRemovedFromDocument',
+  DOMNODEINSERTEDINTODOCUMENT: 'DOMNodeInsertedIntoDocument',
+  DOMATTRMODIFIED: 'DOMAttrModified',
+  DOMCHARACTERDATAMODIFIED: 'DOMCharacterDataModified',
+
+  // Print events.
+  BEFOREPRINT: 'beforeprint',
+  AFTERPRINT: 'afterprint'
+};
+
+// Copyright 2009 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Useful compiler idioms.
+ *
+ * @author johnlenz@google.com (John Lenz)
+ */
+
+goog.provide('goog.reflect');
+
+
+/**
+ * Syntax for object literal casts.
+ * @see http://go/jscompiler-renaming
+ * @see https://github.com/google/closure-compiler/wiki/Type-Based-Property-Renaming
+ *
+ * Use this if you have an object literal whose keys need to have the same names
+ * as the properties of some class even after they are renamed by the compiler.
+ *
+ * @param {!Function} type Type to cast to.
+ * @param {Object} object Object literal to cast.
+ * @return {Object} The object literal.
+ */
+goog.reflect.object = function(type, object) {
+  return object;
+};
+
+
+/**
+ * To assert to the compiler that an operation is needed when it would
+ * otherwise be stripped. For example:
+ * <code>
+ *     // Force a layout
+ *     goog.reflect.sinkValue(dialog.offsetHeight);
+ * </code>
+ * @type {!Function}
+ */
+goog.reflect.sinkValue = function(x) {
+  goog.reflect.sinkValue[' '](x);
+  return x;
+};
+
+
+/**
+ * The compiler should optimize this function away iff no one ever uses
+ * goog.reflect.sinkValue.
+ */
+goog.reflect.sinkValue[' '] = goog.nullFunction;
+
+
+/**
+ * Check if a property can be accessed without throwing an exception.
+ * @param {Object} obj The owner of the property.
+ * @param {string} prop The property name.
+ * @return {boolean} Whether the property is accessible. Will also return true
+ *     if obj is null.
+ */
+goog.reflect.canAccessProperty = function(obj, prop) {
+  /** @preserveTry */
+  try {
+    goog.reflect.sinkValue(obj[prop]);
+    return true;
+  } catch (e) {}
+  return false;
+};
+
+// Copyright 2005 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview A patched, standardized event object for browser events.
+ *
+ * <pre>
+ * The patched event object contains the following members:
+ * - type           {string}    Event type, e.g. 'click'
+ * - target         {Object}    The element that actually triggered the event
+ * - currentTarget  {Object}    The element the listener is attached to
+ * - relatedTarget  {Object}    For mouseover and mouseout, the previous object
+ * - offsetX        {number}    X-coordinate relative to target
+ * - offsetY        {number}    Y-coordinate relative to target
+ * - clientX        {number}    X-coordinate relative to viewport
+ * - clientY        {number}    Y-coordinate relative to viewport
+ * - screenX        {number}    X-coordinate relative to the edge of the screen
+ * - screenY        {number}    Y-coordinate relative to the edge of the screen
+ * - button         {number}    Mouse button. Use isButton() to test.
+ * - keyCode        {number}    Key-code
+ * - ctrlKey        {boolean}   Was ctrl key depressed
+ * - altKey         {boolean}   Was alt key depressed
+ * - shiftKey       {boolean}   Was shift key depressed
+ * - metaKey        {boolean}   Was meta key depressed
+ * - defaultPrevented {boolean} Whether the default action has been prevented
+ * - state          {Object}    History state object
+ *
+ * NOTE: The keyCode member contains the raw browser keyCode. For normalized
+ * key and character code use {@link goog.events.KeyHandler}.
+ * </pre>
+ *
+ * @author arv@google.com (Erik Arvidsson)
+ */
+
+goog.provide('goog.events.BrowserEvent');
+goog.provide('goog.events.BrowserEvent.MouseButton');
+
+goog.require('goog.events.BrowserFeature');
+goog.require('goog.events.Event');
+goog.require('goog.events.EventType');
+goog.require('goog.reflect');
+goog.require('goog.userAgent');
+
+
+
+/**
+ * Accepts a browser event object and creates a patched, cross browser event
+ * object.
+ * The content of this object will not be initialized if no event object is
+ * provided. If this is the case, init() needs to be invoked separately.
+ * @param {Event=} opt_e Browser event object.
+ * @param {EventTarget=} opt_currentTarget Current target for event.
+ * @constructor
+ * @extends {goog.events.Event}
+ */
+goog.events.BrowserEvent = function(opt_e, opt_currentTarget) {
+  goog.events.BrowserEvent.base(this, 'constructor', opt_e ? opt_e.type : '');
+
+  /**
+   * Target that fired the event.
+   * @override
+   * @type {Node}
+   */
+  this.target = null;
+
+  /**
+   * Node that had the listener attached.
+   * @override
+   * @type {Node|undefined}
+   */
+  this.currentTarget = null;
+
+  /**
+   * For mouseover and mouseout events, the related object for the event.
+   * @type {Node}
+   */
+  this.relatedTarget = null;
+
+  /**
+   * X-coordinate relative to target.
+   * @type {number}
+   */
+  this.offsetX = 0;
+
+  /**
+   * Y-coordinate relative to target.
+   * @type {number}
+   */
+  this.offsetY = 0;
+
+  /**
+   * X-coordinate relative to the window.
+   * @type {number}
+   */
+  this.clientX = 0;
+
+  /**
+   * Y-coordinate relative to the window.
+   * @type {number}
+   */
+  this.clientY = 0;
+
+  /**
+   * X-coordinate relative to the monitor.
+   * @type {number}
+   */
+  this.screenX = 0;
+
+  /**
+   * Y-coordinate relative to the monitor.
+   * @type {number}
+   */
+  this.screenY = 0;
+
+  /**
+   * Which mouse button was pressed.
+   * @type {number}
+   */
+  this.button = 0;
+
+  /**
+   * Keycode of key press.
+   * @type {number}
+   */
+  this.keyCode = 0;
+
+  /**
+   * Keycode of key press.
+   * @type {number}
+   */
+  this.charCode = 0;
+
+  /**
+   * Whether control was pressed at time of event.
+   * @type {boolean}
+   */
+  this.ctrlKey = false;
+
+  /**
+   * Whether alt was pressed at time of event.
+   * @type {boolean}
+   */
+  this.altKey = false;
+
+  /**
+   * Whether shift was pressed at time of event.
+   * @type {boolean}
+   */
+  this.shiftKey = false;
+
+  /**
+   * Whether the meta key was pressed at time of event.
+   * @type {boolean}
+   */
+  this.metaKey = false;
+
+  /**
+   * History state object, only set for PopState events where it's a copy of the
+   * state object provided to pushState or replaceState.
+   * @type {Object}
+   */
+  this.state = null;
+
+  /**
+   * Whether the default platform modifier key was pressed at time of event.
+   * (This is control for all platforms except Mac, where it's Meta.)
+   * @type {boolean}
+   */
+  this.platformModifierKey = false;
+
+  /**
+   * The browser event object.
+   * @private {Event}
+   */
+  this.event_ = null;
+
+  if (opt_e) {
+    this.init(opt_e, opt_currentTarget);
+  }
+};
+goog.inherits(goog.events.BrowserEvent, goog.events.Event);
+
+
+/**
+ * Normalized button constants for the mouse.
+ * @enum {number}
+ */
+goog.events.BrowserEvent.MouseButton = {
+  LEFT: 0,
+  MIDDLE: 1,
+  RIGHT: 2
+};
+
+
+/**
+ * Static data for mapping mouse buttons.
+ * @type {!Array<number>}
+ */
+goog.events.BrowserEvent.IEButtonMap = [
+  1, // LEFT
+  4, // MIDDLE
+  2  // RIGHT
+];
+
+
+/**
+ * Accepts a browser event object and creates a patched, cross browser event
+ * object.
+ * @param {Event} e Browser event object.
+ * @param {EventTarget=} opt_currentTarget Current target for event.
+ */
+goog.events.BrowserEvent.prototype.init = function(e, opt_currentTarget) {
+  var type = this.type = e.type;
+
+  /**
+   * On touch devices use the first "changed touch" as the relevant touch.
+   * @type {Touch}
+   */
+  var relevantTouch = e.changedTouches ? e.changedTouches[0] : null;
+
+  // TODO(nicksantos): Change this.target to type EventTarget.
+  this.target = /** @type {Node} */ (e.target) || e.srcElement;
+
+  // TODO(nicksantos): Change this.currentTarget to type EventTarget.
+  this.currentTarget = /** @type {Node} */ (opt_currentTarget);
+
+  var relatedTarget = /** @type {Node} */ (e.relatedTarget);
+  if (relatedTarget) {
+    // There's a bug in FireFox where sometimes, relatedTarget will be a
+    // chrome element, and accessing any property of it will get a permission
+    // denied exception. See:
+    // https://bugzilla.mozilla.org/show_bug.cgi?id=497780
+    if (goog.userAgent.GECKO) {
+      if (!goog.reflect.canAccessProperty(relatedTarget, 'nodeName')) {
+        relatedTarget = null;
+      }
+    }
+    // TODO(arv): Use goog.events.EventType when it has been refactored into its
+    // own file.
+  } else if (type == goog.events.EventType.MOUSEOVER) {
+    relatedTarget = e.fromElement;
+  } else if (type == goog.events.EventType.MOUSEOUT) {
+    relatedTarget = e.toElement;
+  }
+
+  this.relatedTarget = relatedTarget;
+
+  if (!goog.isNull(relevantTouch)) {
+    this.clientX = relevantTouch.clientX !== undefined ?
+        relevantTouch.clientX : relevantTouch.pageX;
+    this.clientY = relevantTouch.clientY !== undefined ?
+        relevantTouch.clientY : relevantTouch.pageY;
+    this.screenX = relevantTouch.screenX || 0;
+    this.screenY = relevantTouch.screenY || 0;
+  } else {
+    // Webkit emits a lame warning whenever layerX/layerY is accessed.
+    // http://code.google.com/p/chromium/issues/detail?id=101733
+    this.offsetX = (goog.userAgent.WEBKIT || e.offsetX !== undefined) ?
+        e.offsetX : e.layerX;
+    this.offsetY = (goog.userAgent.WEBKIT || e.offsetY !== undefined) ?
+        e.offsetY : e.layerY;
+    this.clientX = e.clientX !== undefined ? e.clientX : e.pageX;
+    this.clientY = e.clientY !== undefined ? e.clientY : e.pageY;
+    this.screenX = e.screenX || 0;
+    this.screenY = e.screenY || 0;
+  }
+
+  this.button = e.button;
+
+  this.keyCode = e.keyCode || 0;
+  this.charCode = e.charCode || (type == 'keypress' ? e.keyCode : 0);
+  this.ctrlKey = e.ctrlKey;
+  this.altKey = e.altKey;
+  this.shiftKey = e.shiftKey;
+  this.metaKey = e.metaKey;
+  this.platformModifierKey = goog.userAgent.MAC ? e.metaKey : e.ctrlKey;
+  this.state = e.state;
+  this.event_ = e;
+  if (e.defaultPrevented) {
+    this.preventDefault();
+  }
+};
+
+
+/**
+ * Tests to see which button was pressed during the event. This is really only
+ * useful in IE and Gecko browsers. And in IE, it's only useful for
+ * mousedown/mouseup events, because click only fires for the left mouse button.
+ *
+ * Safari 2 only reports the left button being clicked, and uses the value '1'
+ * instead of 0. Opera only reports a mousedown event for the middle button, and
+ * no mouse events for the right button. Opera has default behavior for left and
+ * middle click that can only be overridden via a configuration setting.
+ *
+ * There's a nice table of this mess at http://www.unixpapa.com/js/mouse.html.
+ *
+ * @param {goog.events.BrowserEvent.MouseButton} button The button
+ *     to test for.
+ * @return {boolean} True if button was pressed.
+ */
+goog.events.BrowserEvent.prototype.isButton = function(button) {
+  if (!goog.events.BrowserFeature.HAS_W3C_BUTTON) {
+    if (this.type == 'click') {
+      return button == goog.events.BrowserEvent.MouseButton.LEFT;
+    } else {
+      return !!(this.event_.button &
+          goog.events.BrowserEvent.IEButtonMap[button]);
+    }
+  } else {
+    return this.event_.button == button;
+  }
+};
+
+
+/**
+ * Whether this has an "action"-producing mouse button.
+ *
+ * By definition, this includes left-click on windows/linux, and left-click
+ * without the ctrl key on Macs.
+ *
+ * @return {boolean} The result.
+ */
+goog.events.BrowserEvent.prototype.isMouseActionButton = function() {
+  // Webkit does not ctrl+click to be a right-click, so we
+  // normalize it to behave like Gecko and Opera.
+  return this.isButton(goog.events.BrowserEvent.MouseButton.LEFT) &&
+      !(goog.userAgent.WEBKIT && goog.userAgent.MAC && this.ctrlKey);
+};
+
+
+/**
+ * @override
+ */
+goog.events.BrowserEvent.prototype.stopPropagation = function() {
+  goog.events.BrowserEvent.superClass_.stopPropagation.call(this);
+  if (this.event_.stopPropagation) {
+    this.event_.stopPropagation();
+  } else {
+    this.event_.cancelBubble = true;
+  }
+};
+
+
+/**
+ * @override
+ */
+goog.events.BrowserEvent.prototype.preventDefault = function() {
+  goog.events.BrowserEvent.superClass_.preventDefault.call(this);
+  var be = this.event_;
+  if (!be.preventDefault) {
+    be.returnValue = false;
+    if (goog.events.BrowserFeature.SET_KEY_CODE_TO_PREVENT_DEFAULT) {
+      /** @preserveTry */
+      try {
+        // Most keys can be prevented using returnValue. Some special keys
+        // require setting the keyCode to -1 as well:
+        //
+        // In IE7:
+        // F3, F5, F10, F11, Ctrl+P, Crtl+O, Ctrl+F (these are taken from IE6)
+        //
+        // In IE8:
+        // Ctrl+P, Crtl+O, Ctrl+F (F1-F12 cannot be stopped through the event)
+        //
+        // We therefore do this for all function keys as well as when Ctrl key
+        // is pressed.
+        var VK_F1 = 112;
+        var VK_F12 = 123;
+        if (be.ctrlKey || be.keyCode >= VK_F1 && be.keyCode <= VK_F12) {
+          be.keyCode = -1;
+        }
+      } catch (ex) {
+        // IE throws an 'access denied' exception when trying to change
+        // keyCode in some situations (e.g. srcElement is input[type=file],
+        // or srcElement is an anchor tag rewritten by parent's innerHTML).
+        // Do nothing in this case.
+      }
+    }
+  } else {
+    be.preventDefault();
+  }
+};
+
+
+/**
+ * @return {Event} The underlying browser event object.
+ */
+goog.events.BrowserEvent.prototype.getBrowserEvent = function() {
+  return this.event_;
+};
+
+// Copyright 2012 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview An interface for a listenable JavaScript object.
+ * @author chrishenry@google.com (Chris Henry)
+ */
+
+goog.provide('goog.events.Listenable');
+goog.provide('goog.events.ListenableKey');
+
+/** @suppress {extraRequire} */
+goog.require('goog.events.EventId');
+
+
+
+/**
+ * A listenable interface. A listenable is an object with the ability
+ * to dispatch/broadcast events to "event listeners" registered via
+ * listen/listenOnce.
+ *
+ * The interface allows for an event propagation mechanism similar
+ * to one offered by native browser event targets, such as
+ * capture/bubble mechanism, stopping propagation, and preventing
+ * default actions. Capture/bubble mechanism depends on the ancestor
+ * tree constructed via {@code #getParentEventTarget}; this tree
+ * must be directed acyclic graph. The meaning of default action(s)
+ * in preventDefault is specific to a particular use case.
+ *
+ * Implementations that do not support capture/bubble or can not have
+ * a parent listenable can simply not implement any ability to set the
+ * parent listenable (and have {@code #getParentEventTarget} return
+ * null).
+ *
+ * Implementation of this class can be used with or independently from
+ * goog.events.
+ *
+ * Implementation must call {@code #addImplementation(implClass)}.
+ *
+ * @interface
+ * @see goog.events
+ * @see http://www.w3.org/TR/DOM-Level-2-Events/events.html
+ */
+goog.events.Listenable = function() {};
+
+
+/**
+ * An expando property to indicate that an object implements
+ * goog.events.Listenable.
+ *
+ * See addImplementation/isImplementedBy.
+ *
+ * @type {string}
+ * @const
+ */
+goog.events.Listenable.IMPLEMENTED_BY_PROP =
+    'closure_listenable_' + ((Math.random() * 1e6) | 0);
+
+
+/**
+ * Marks a given class (constructor) as an implementation of
+ * Listenable, do that we can query that fact at runtime. The class
+ * must have already implemented the interface.
+ * @param {!Function} cls The class constructor. The corresponding
+ *     class must have already implemented the interface.
+ */
+goog.events.Listenable.addImplementation = function(cls) {
+  cls.prototype[goog.events.Listenable.IMPLEMENTED_BY_PROP] = true;
+};
+
+
+/**
+ * @param {Object} obj The object to check.
+ * @return {boolean} Whether a given instance implements Listenable. The
+ *     class/superclass of the instance must call addImplementation.
+ */
+goog.events.Listenable.isImplementedBy = function(obj) {
+  return !!(obj && obj[goog.events.Listenable.IMPLEMENTED_BY_PROP]);
+};
+
+
+/**
+ * Adds an event listener. A listener can only be added once to an
+ * object and if it is added again the key for the listener is
+ * returned. Note that if the existing listener is a one-off listener
+ * (registered via listenOnce), it will no longer be a one-off
+ * listener after a call to listen().
+ *
+ * @param {string|!goog.events.EventId<EVENTOBJ>} type The event type id.
+ * @param {function(this:SCOPE, EVENTOBJ):(boolean|undefined)} listener Callback
+ *     method.
+ * @param {boolean=} opt_useCapture Whether to fire in capture phase
+ *     (defaults to false).
+ * @param {SCOPE=} opt_listenerScope Object in whose scope to call the
+ *     listener.
+ * @return {goog.events.ListenableKey} Unique key for the listener.
+ * @template SCOPE,EVENTOBJ
+ */
+goog.events.Listenable.prototype.listen;
+
+
+/**
+ * Adds an event listener that is removed automatically after the
+ * listener fired once.
+ *
+ * If an existing listener already exists, listenOnce will do
+ * nothing. In particular, if the listener was previously registered
+ * via listen(), listenOnce() will not turn the listener into a
+ * one-off listener. Similarly, if there is already an existing
+ * one-off listener, listenOnce does not modify the listeners (it is
+ * still a once listener).
+ *
+ * @param {string|!goog.events.EventId<EVENTOBJ>} type The event type id.
+ * @param {function(this:SCOPE, EVENTOBJ):(boolean|undefined)} listener Callback
+ *     method.
+ * @param {boolean=} opt_useCapture Whether to fire in capture phase
+ *     (defaults to false).
+ * @param {SCOPE=} opt_listenerScope Object in whose scope to call the
+ *     listener.
+ * @return {goog.events.ListenableKey} Unique key for the listener.
+ * @template SCOPE,EVENTOBJ
+ */
+goog.events.Listenable.prototype.listenOnce;
+
+
+/**
+ * Removes an event listener which was added with listen() or listenOnce().
+ *
+ * @param {string|!goog.events.EventId<EVENTOBJ>} type The event type id.
+ * @param {function(this:SCOPE, EVENTOBJ):(boolean|undefined)} listener Callback
+ *     method.
+ * @param {boolean=} opt_useCapture Whether to fire in capture phase
+ *     (defaults to false).
+ * @param {SCOPE=} opt_listenerScope Object in whose scope to call
+ *     the listener.
+ * @return {boolean} Whether any listener was removed.
+ * @template SCOPE,EVENTOBJ
+ */
+goog.events.Listenable.prototype.unlisten;
+
+
+/**
+ * Removes an event listener which was added with listen() by the key
+ * returned by listen().
+ *
+ * @param {goog.events.ListenableKey} key The key returned by
+ *     listen() or listenOnce().
+ * @return {boolean} Whether any listener was removed.
+ */
+goog.events.Listenable.prototype.unlistenByKey;
+
+
+/**
+ * Dispatches an event (or event like object) and calls all listeners
+ * listening for events of this type. The type of the event is decided by the
+ * type property on the event object.
+ *
+ * If any of the listeners returns false OR calls preventDefault then this
+ * function will return false.  If one of the capture listeners calls
+ * stopPropagation, then the bubble listeners won't fire.
+ *
+ * @param {goog.events.EventLike} e Event object.
+ * @return {boolean} If anyone called preventDefault on the event object (or
+ *     if any of the listeners returns false) this will also return false.
+ */
+goog.events.Listenable.prototype.dispatchEvent;
+
+
+/**
+ * Removes all listeners from this listenable. If type is specified,
+ * it will only remove listeners of the particular type. otherwise all
+ * registered listeners will be removed.
+ *
+ * @param {string=} opt_type Type of event to remove, default is to
+ *     remove all types.
+ * @return {number} Number of listeners removed.
+ */
+goog.events.Listenable.prototype.removeAllListeners;
+
+
+/**
+ * Returns the parent of this event target to use for capture/bubble
+ * mechanism.
+ *
+ * NOTE(chrishenry): The name reflects the original implementation of
+ * custom event target ({@code goog.events.EventTarget}). We decided
+ * that changing the name is not worth it.
+ *
+ * @return {goog.events.Listenable} The parent EventTarget or null if
+ *     there is no parent.
+ */
+goog.events.Listenable.prototype.getParentEventTarget;
+
+
+/**
+ * Fires all registered listeners in this listenable for the given
+ * type and capture mode, passing them the given eventObject. This
+ * does not perform actual capture/bubble. Only implementors of the
+ * interface should be using this.
+ *
+ * @param {string|!goog.events.EventId<EVENTOBJ>} type The type of the
+ *     listeners to fire.
+ * @param {boolean} capture The capture mode of the listeners to fire.
+ * @param {EVENTOBJ} eventObject The event object to fire.
+ * @return {boolean} Whether all listeners succeeded without
+ *     attempting to prevent default behavior. If any listener returns
+ *     false or called goog.events.Event#preventDefault, this returns
+ *     false.
+ * @template EVENTOBJ
+ */
+goog.events.Listenable.prototype.fireListeners;
+
+
+/**
+ * Gets all listeners in this listenable for the given type and
+ * capture mode.
+ *
+ * @param {string|!goog.events.EventId} type The type of the listeners to fire.
+ * @param {boolean} capture The capture mode of the listeners to fire.
+ * @return {!Array<goog.events.ListenableKey>} An array of registered
+ *     listeners.
+ * @template EVENTOBJ
+ */
+goog.events.Listenable.prototype.getListeners;
+
+
+/**
+ * Gets the goog.events.ListenableKey for the event or null if no such
+ * listener is in use.
+ *
+ * @param {string|!goog.events.EventId<EVENTOBJ>} type The name of the event
+ *     without the 'on' prefix.
+ * @param {function(this:SCOPE, EVENTOBJ):(boolean|undefined)} listener The
+ *     listener function to get.
+ * @param {boolean} capture Whether the listener is a capturing listener.
+ * @param {SCOPE=} opt_listenerScope Object in whose scope to call the
+ *     listener.
+ * @return {goog.events.ListenableKey} the found listener or null if not found.
+ * @template SCOPE,EVENTOBJ
+ */
+goog.events.Listenable.prototype.getListener;
+
+
+/**
+ * Whether there is any active listeners matching the specified
+ * signature. If either the type or capture parameters are
+ * unspecified, the function will match on the remaining criteria.
+ *
+ * @param {string|!goog.events.EventId<EVENTOBJ>=} opt_type Event type.
+ * @param {boolean=} opt_capture Whether to check for capture or bubble
+ *     listeners.
+ * @return {boolean} Whether there is any active listeners matching
+ *     the requested type and/or capture phase.
+ * @template EVENTOBJ
+ */
+goog.events.Listenable.prototype.hasListener;
+
+
+
+/**
+ * An interface that describes a single registered listener.
+ * @interface
+ */
+goog.events.ListenableKey = function() {};
+
+
+/**
+ * Counter used to create a unique key
+ * @type {number}
+ * @private
+ */
+goog.events.ListenableKey.counter_ = 0;
+
+
+/**
+ * Reserves a key to be used for ListenableKey#key field.
+ * @return {number} A number to be used to fill ListenableKey#key
+ *     field.
+ */
+goog.events.ListenableKey.reserveKey = function() {
+  return ++goog.events.ListenableKey.counter_;
+};
+
+
+/**
+ * The source event target.
+ * @type {!(Object|goog.events.Listenable|goog.events.EventTarget)}
+ */
+goog.events.ListenableKey.prototype.src;
+
+
+/**
+ * The event type the listener is listening to.
+ * @type {string}
+ */
+goog.events.ListenableKey.prototype.type;
+
+
+/**
+ * The listener function.
+ * @type {function(?):?|{handleEvent:function(?):?}|null}
+ */
+goog.events.ListenableKey.prototype.listener;
+
+
+/**
+ * Whether the listener works on capture phase.
+ * @type {boolean}
+ */
+goog.events.ListenableKey.prototype.capture;
+
+
+/**
+ * The 'this' object for the listener function's scope.
+ * @type {Object}
+ */
+goog.events.ListenableKey.prototype.handler;
+
+
+/**
+ * A globally unique number to identify the key.
+ * @type {number}
+ */
+goog.events.ListenableKey.prototype.key;
+
+// Copyright 2005 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Listener object.
+ * @see ../demos/events.html
+ */
+
+goog.provide('goog.events.Listener');
+
+goog.require('goog.events.ListenableKey');
+
+
+
+/**
+ * Simple class that stores information about a listener
+ * @param {!Function} listener Callback function.
+ * @param {Function} proxy Wrapper for the listener that patches the event.
+ * @param {EventTarget|goog.events.Listenable} src Source object for
+ *     the event.
+ * @param {string} type Event type.
+ * @param {boolean} capture Whether in capture or bubble phase.
+ * @param {Object=} opt_handler Object in whose context to execute the callback.
+ * @implements {goog.events.ListenableKey}
+ * @constructor
+ */
+goog.events.Listener = function(
+    listener, proxy, src, type, capture, opt_handler) {
+  if (goog.events.Listener.ENABLE_MONITORING) {
+    this.creationStack = new Error().stack;
+  }
+
+  /**
+   * Callback function.
+   * @type {Function}
+   */
+  this.listener = listener;
+
+  /**
+   * A wrapper over the original listener. This is used solely to
+   * handle native browser events (it is used to simulate the capture
+   * phase and to patch the event object).
+   * @type {Function}
+   */
+  this.proxy = proxy;
+
+  /**
+   * Object or node that callback is listening to
+   * @type {EventTarget|goog.events.Listenable}
+   */
+  this.src = src;
+
+  /**
+   * The event type.
+   * @const {string}
+   */
+  this.type = type;
+
+  /**
+   * Whether the listener is being called in the capture or bubble phase
+   * @const {boolean}
+   */
+  this.capture = !!capture;
+
+  /**
+   * Optional object whose context to execute the listener in
+   * @type {Object|undefined}
+   */
+  this.handler = opt_handler;
+
+  /**
+   * The key of the listener.
+   * @const {number}
+   * @override
+   */
+  this.key = goog.events.ListenableKey.reserveKey();
+
+  /**
+   * Whether to remove the listener after it has been called.
+   * @type {boolean}
+   */
+  this.callOnce = false;
+
+  /**
+   * Whether the listener has been removed.
+   * @type {boolean}
+   */
+  this.removed = false;
+};
+
+
+/**
+ * @define {boolean} Whether to enable the monitoring of the
+ *     goog.events.Listener instances. Switching on the monitoring is only
+ *     recommended for debugging because it has a significant impact on
+ *     performance and memory usage. If switched off, the monitoring code
+ *     compiles down to 0 bytes.
+ */
+goog.define('goog.events.Listener.ENABLE_MONITORING', false);
+
+
+/**
+ * If monitoring the goog.events.Listener instances is enabled, stores the
+ * creation stack trace of the Disposable instance.
+ * @type {string}
+ */
+goog.events.Listener.prototype.creationStack;
+
+
+/**
+ * Marks this listener as removed. This also remove references held by
+ * this listener object (such as listener and event source).
+ */
+goog.events.Listener.prototype.markAsRemoved = function() {
+  this.removed = true;
+  this.listener = null;
+  this.proxy = null;
+  this.src = null;
+  this.handler = null;
+};
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview A map of listeners that provides utility functions to
+ * deal with listeners on an event target. Used by
+ * {@code goog.events.EventTarget}.
+ *
+ * WARNING: Do not use this class from outside goog.events package.
+ *
+ * @visibility {//closure/goog/bin/sizetests:__pkg__}
+ * @visibility {//closure/goog/events:__pkg__}
+ * @visibility {//closure/goog/labs/events:__pkg__}
+ */
+
+goog.provide('goog.events.ListenerMap');
+
+goog.require('goog.array');
+goog.require('goog.events.Listener');
+goog.require('goog.object');
+
+
+
+/**
+ * Creates a new listener map.
+ * @param {EventTarget|goog.events.Listenable} src The src object.
+ * @constructor
+ * @final
+ */
+goog.events.ListenerMap = function(src) {
+  /** @type {EventTarget|goog.events.Listenable} */
+  this.src = src;
+
+  /**
+   * Maps of event type to an array of listeners.
+   * @type {Object<string, !Array<!goog.events.Listener>>}
+   */
+  this.listeners = {};
+
+  /**
+   * The count of types in this map that have registered listeners.
+   * @private {number}
+   */
+  this.typeCount_ = 0;
+};
+
+
+/**
+ * @return {number} The count of event types in this map that actually
+ *     have registered listeners.
+ */
+goog.events.ListenerMap.prototype.getTypeCount = function() {
+  return this.typeCount_;
+};
+
+
+/**
+ * @return {number} Total number of registered listeners.
+ */
+goog.events.ListenerMap.prototype.getListenerCount = function() {
+  var count = 0;
+  for (var type in this.listeners) {
+    count += this.listeners[type].length;
+  }
+  return count;
+};
+
+
+/**
+ * Adds an event listener. A listener can only be added once to an
+ * object and if it is added again the key for the listener is
+ * returned.
+ *
+ * Note that a one-off listener will not change an existing listener,
+ * if any. On the other hand a normal listener will change existing
+ * one-off listener to become a normal listener.
+ *
+ * @param {string|!goog.events.EventId} type The listener event type.
+ * @param {!Function} listener This listener callback method.
+ * @param {boolean} callOnce Whether the listener is a one-off
+ *     listener.
+ * @param {boolean=} opt_useCapture The capture mode of the listener.
+ * @param {Object=} opt_listenerScope Object in whose scope to call the
+ *     listener.
+ * @return {goog.events.ListenableKey} Unique key for the listener.
+ */
+goog.events.ListenerMap.prototype.add = function(
+    type, listener, callOnce, opt_useCapture, opt_listenerScope) {
+  var typeStr = type.toString();
+  var listenerArray = this.listeners[typeStr];
+  if (!listenerArray) {
+    listenerArray = this.listeners[typeStr] = [];
+    this.typeCount_++;
+  }
+
+  var listenerObj;
+  var index = goog.events.ListenerMap.findListenerIndex_(
+      listenerArray, listener, opt_useCapture, opt_listenerScope);
+  if (index > -1) {
+    listenerObj = listenerArray[index];
+    if (!callOnce) {
+      // Ensure that, if there is an existing callOnce listener, it is no
+      // longer a callOnce listener.
+      listenerObj.callOnce = false;
+    }
+  } else {
+    listenerObj = new goog.events.Listener(
+        listener, null, this.src, typeStr, !!opt_useCapture, opt_listenerScope);
+    listenerObj.callOnce = callOnce;
+    listenerArray.push(listenerObj);
+  }
+  return listenerObj;
+};
+
+
+/**
+ * Removes a matching listener.
+ * @param {string|!goog.events.EventId} type The listener event type.
+ * @param {!Function} listener This listener callback method.
+ * @param {boolean=} opt_useCapture The capture mode of the listener.
+ * @param {Object=} opt_listenerScope Object in whose scope to call the
+ *     listener.
+ * @return {boolean} Whether any listener was removed.
+ */
+goog.events.ListenerMap.prototype.remove = function(
+    type, listener, opt_useCapture, opt_listenerScope) {
+  var typeStr = type.toString();
+  if (!(typeStr in this.listeners)) {
+    return false;
+  }
+
+  var listenerArray = this.listeners[typeStr];
+  var index = goog.events.ListenerMap.findListenerIndex_(
+      listenerArray, listener, opt_useCapture, opt_listenerScope);
+  if (index > -1) {
+    var listenerObj = listenerArray[index];
+    listenerObj.markAsRemoved();
+    goog.array.removeAt(listenerArray, index);
+    if (listenerArray.length == 0) {
+      delete this.listeners[typeStr];
+      this.typeCount_--;
+    }
+    return true;
+  }
+  return false;
+};
+
+
+/**
+ * Removes the given listener object.
+ * @param {goog.events.ListenableKey} listener The listener to remove.
+ * @return {boolean} Whether the listener is removed.
+ */
+goog.events.ListenerMap.prototype.removeByKey = function(listener) {
+  var type = listener.type;
+  if (!(type in this.listeners)) {
+    return false;
+  }
+
+  var removed = goog.array.remove(this.listeners[type], listener);
+  if (removed) {
+    listener.markAsRemoved();
+    if (this.listeners[type].length == 0) {
+      delete this.listeners[type];
+      this.typeCount_--;
+    }
+  }
+  return removed;
+};
+
+
+/**
+ * Removes all listeners from this map. If opt_type is provided, only
+ * listeners that match the given type are removed.
+ * @param {string|!goog.events.EventId=} opt_type Type of event to remove.
+ * @return {number} Number of listeners removed.
+ */
+goog.events.ListenerMap.prototype.removeAll = function(opt_type) {
+  var typeStr = opt_type && opt_type.toString();
+  var count = 0;
+  for (var type in this.listeners) {
+    if (!typeStr || type == typeStr) {
+      var listenerArray = this.listeners[type];
+      for (var i = 0; i < listenerArray.length; i++) {
+        ++count;
+        listenerArray[i].markAsRemoved();
+      }
+      delete this.listeners[type];
+      this.typeCount_--;
+    }
+  }
+  return count;
+};
+
+
+/**
+ * Gets all listeners that match the given type and capture mode. The
+ * returned array is a copy (but the listener objects are not).
+ * @param {string|!goog.events.EventId} type The type of the listeners
+ *     to retrieve.
+ * @param {boolean} capture The capture mode of the listeners to retrieve.
+ * @return {!Array<goog.events.ListenableKey>} An array of matching
+ *     listeners.
+ */
+goog.events.ListenerMap.prototype.getListeners = function(type, capture) {
+  var listenerArray = this.listeners[type.toString()];
+  var rv = [];
+  if (listenerArray) {
+    for (var i = 0; i < listenerArray.length; ++i) {
+      var listenerObj = listenerArray[i];
+      if (listenerObj.capture == capture) {
+        rv.push(listenerObj);
+      }
+    }
+  }
+  return rv;
+};
+
+
+/**
+ * Gets the goog.events.ListenableKey for the event or null if no such
+ * listener is in use.
+ *
+ * @param {string|!goog.events.EventId} type The type of the listener
+ *     to retrieve.
+ * @param {!Function} listener The listener function to get.
+ * @param {boolean} capture Whether the listener is a capturing listener.
+ * @param {Object=} opt_listenerScope Object in whose scope to call the
+ *     listener.
+ * @return {goog.events.ListenableKey} the found listener or null if not found.
+ */
+goog.events.ListenerMap.prototype.getListener = function(
+    type, listener, capture, opt_listenerScope) {
+  var listenerArray = this.listeners[type.toString()];
+  var i = -1;
+  if (listenerArray) {
+    i = goog.events.ListenerMap.findListenerIndex_(
+        listenerArray, listener, capture, opt_listenerScope);
+  }
+  return i > -1 ? listenerArray[i] : null;
+};
+
+
+/**
+ * Whether there is a matching listener. If either the type or capture
+ * parameters are unspecified, the function will match on the
+ * remaining criteria.
+ *
+ * @param {string|!goog.events.EventId=} opt_type The type of the listener.
+ * @param {boolean=} opt_capture The capture mode of the listener.
+ * @return {boolean} Whether there is an active listener matching
+ *     the requested type and/or capture phase.
+ */
+goog.events.ListenerMap.prototype.hasListener = function(
+    opt_type, opt_capture) {
+  var hasType = goog.isDef(opt_type);
+  var typeStr = hasType ? opt_type.toString() : '';
+  var hasCapture = goog.isDef(opt_capture);
+
+  return goog.object.some(
+      this.listeners, function(listenerArray, type) {
+        for (var i = 0; i < listenerArray.length; ++i) {
+          if ((!hasType || listenerArray[i].type == typeStr) &&
+              (!hasCapture || listenerArray[i].capture == opt_capture)) {
+            return true;
+          }
+        }
+
+        return false;
+      });
+};
+
+
+/**
+ * Finds the index of a matching goog.events.Listener in the given
+ * listenerArray.
+ * @param {!Array<!goog.events.Listener>} listenerArray Array of listener.
+ * @param {!Function} listener The listener function.
+ * @param {boolean=} opt_useCapture The capture flag for the listener.
+ * @param {Object=} opt_listenerScope The listener scope.
+ * @return {number} The index of the matching listener within the
+ *     listenerArray.
+ * @private
+ */
+goog.events.ListenerMap.findListenerIndex_ = function(
+    listenerArray, listener, opt_useCapture, opt_listenerScope) {
+  for (var i = 0; i < listenerArray.length; ++i) {
+    var listenerObj = listenerArray[i];
+    if (!listenerObj.removed &&
+        listenerObj.listener == listener &&
+        listenerObj.capture == !!opt_useCapture &&
+        listenerObj.handler == opt_listenerScope) {
+      return i;
+    }
+  }
+  return -1;
+};
+
+// Copyright 2005 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview An event manager for both native browser event
+ * targets and custom JavaScript event targets
+ * ({@code goog.events.Listenable}). This provides an abstraction
+ * over browsers' event systems.
+ *
+ * It also provides a simulation of W3C event model's capture phase in
+ * Internet Explorer (IE 8 and below). Caveat: the simulation does not
+ * interact well with listeners registered directly on the elements
+ * (bypassing goog.events) or even with listeners registered via
+ * goog.events in a separate JS binary. In these cases, we provide
+ * no ordering guarantees.
+ *
+ * The listeners will receive a "patched" event object. Such event object
+ * contains normalized values for certain event properties that differs in
+ * different browsers.
+ *
+ * Example usage:
+ * <pre>
+ * goog.events.listen(myNode, 'click', function(e) { alert('woo') });
+ * goog.events.listen(myNode, 'mouseover', mouseHandler, true);
+ * goog.events.unlisten(myNode, 'mouseover', mouseHandler, true);
+ * goog.events.removeAll(myNode);
+ * </pre>
+ *
+ *                                            in IE and event object patching]
+ * @author arv@google.com (Erik Arvidsson)
+ *
+ * @see ../demos/events.html
+ * @see ../demos/event-propagation.html
+ * @see ../demos/stopevent.html
+ */
+
+// IMPLEMENTATION NOTES:
+// goog.events stores an auxiliary data structure on each EventTarget
+// source being listened on. This allows us to take advantage of GC,
+// having the data structure GC'd when the EventTarget is GC'd. This
+// GC behavior is equivalent to using W3C DOM Events directly.
+
+goog.provide('goog.events');
+goog.provide('goog.events.CaptureSimulationMode');
+goog.provide('goog.events.Key');
+goog.provide('goog.events.ListenableType');
+
+goog.require('goog.asserts');
+goog.require('goog.debug.entryPointRegistry');
+goog.require('goog.events.BrowserEvent');
+goog.require('goog.events.BrowserFeature');
+goog.require('goog.events.Listenable');
+goog.require('goog.events.ListenerMap');
+
+goog.forwardDeclare('goog.debug.ErrorHandler');
+goog.forwardDeclare('goog.events.EventWrapper');
+
+
+/**
+ * @typedef {number|goog.events.ListenableKey}
+ */
+goog.events.Key;
+
+
+/**
+ * @typedef {EventTarget|goog.events.Listenable}
+ */
+goog.events.ListenableType;
+
+
+/**
+ * Property name on a native event target for the listener map
+ * associated with the event target.
+ * @private @const {string}
+ */
+goog.events.LISTENER_MAP_PROP_ = 'closure_lm_' + ((Math.random() * 1e6) | 0);
+
+
+/**
+ * String used to prepend to IE event types.
+ * @const
+ * @private
+ */
+goog.events.onString_ = 'on';
+
+
+/**
+ * Map of computed "on<eventname>" strings for IE event types. Caching
+ * this removes an extra object allocation in goog.events.listen which
+ * improves IE6 performance.
+ * @const
+ * @dict
+ * @private
+ */
+goog.events.onStringMap_ = {};
+
+
+/**
+ * @enum {number} Different capture simulation mode for IE8-.
+ */
+goog.events.CaptureSimulationMode = {
+  /**
+   * Does not perform capture simulation. Will asserts in IE8- when you
+   * add capture listeners.
+   */
+  OFF_AND_FAIL: 0,
+
+  /**
+   * Does not perform capture simulation, silently ignore capture
+   * listeners.
+   */
+  OFF_AND_SILENT: 1,
+
+  /**
+   * Performs capture simulation.
+   */
+  ON: 2
+};
+
+
+/**
+ * @define {number} The capture simulation mode for IE8-. By default,
+ *     this is ON.
+ */
+goog.define('goog.events.CAPTURE_SIMULATION_MODE', 2);
+
+
+/**
+ * Estimated count of total native listeners.
+ * @private {number}
+ */
+goog.events.listenerCountEstimate_ = 0;
+
+
+/**
+ * Adds an event listener for a specific event on a native event
+ * target (such as a DOM element) or an object that has implemented
+ * {@link goog.events.Listenable}. A listener can only be added once
+ * to an object and if it is added again the key for the listener is
+ * returned. Note that if the existing listener is a one-off listener
+ * (registered via listenOnce), it will no longer be a one-off
+ * listener after a call to listen().
+ *
+ * @param {EventTarget|goog.events.Listenable} src The node to listen
+ *     to events on.
+ * @param {string|Array<string>|
+ *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}
+ *     type Event type or array of event types.
+ * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(?):?}|null}
+ *     listener Callback method, or an object with a handleEvent function.
+ *     WARNING: passing an Object is now softly deprecated.
+ * @param {boolean=} opt_capt Whether to fire in capture phase (defaults to
+ *     false).
+ * @param {T=} opt_handler Element in whose scope to call the listener.
+ * @return {goog.events.Key} Unique key for the listener.
+ * @template T,EVENTOBJ
+ */
+goog.events.listen = function(src, type, listener, opt_capt, opt_handler) {
+  if (goog.isArray(type)) {
+    for (var i = 0; i < type.length; i++) {
+      goog.events.listen(src, type[i], listener, opt_capt, opt_handler);
+    }
+    return null;
+  }
+
+  listener = goog.events.wrapListener(listener);
+  if (goog.events.Listenable.isImplementedBy(src)) {
+    return src.listen(
+        /** @type {string|!goog.events.EventId} */ (type),
+        listener, opt_capt, opt_handler);
+  } else {
+    return goog.events.listen_(
+        /** @type {!EventTarget} */ (src),
+        /** @type {string|!goog.events.EventId} */ (type),
+        listener, /* callOnce */ false, opt_capt, opt_handler);
+  }
+};
+
+
+/**
+ * Adds an event listener for a specific event on a native event
+ * target. A listener can only be added once to an object and if it
+ * is added again the key for the listener is returned.
+ *
+ * Note that a one-off listener will not change an existing listener,
+ * if any. On the other hand a normal listener will change existing
+ * one-off listener to become a normal listener.
+ *
+ * @param {EventTarget} src The node to listen to events on.
+ * @param {string|!goog.events.EventId} type Event type.
+ * @param {!Function} listener Callback function.
+ * @param {boolean} callOnce Whether the listener is a one-off
+ *     listener or otherwise.
+ * @param {boolean=} opt_capt Whether to fire in capture phase (defaults to
+ *     false).
+ * @param {Object=} opt_handler Element in whose scope to call the listener.
+ * @return {goog.events.ListenableKey} Unique key for the listener.
+ * @private
+ */
+goog.events.listen_ = function(
+    src, type, listener, callOnce, opt_capt, opt_handler) {
+  if (!type) {
+    throw Error('Invalid event type');
+  }
+
+  var capture = !!opt_capt;
+  if (capture && !goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT) {
+    if (goog.events.CAPTURE_SIMULATION_MODE ==
+        goog.events.CaptureSimulationMode.OFF_AND_FAIL) {
+      goog.asserts.fail('Can not register capture listener in IE8-.');
+      return null;
+    } else if (goog.events.CAPTURE_SIMULATION_MODE ==
+        goog.events.CaptureSimulationMode.OFF_AND_SILENT) {
+      return null;
+    }
+  }
+
+  var listenerMap = goog.events.getListenerMap_(src);
+  if (!listenerMap) {
+    src[goog.events.LISTENER_MAP_PROP_] = listenerMap =
+        new goog.events.ListenerMap(src);
+  }
+
+  var listenerObj = listenerMap.add(
+      type, listener, callOnce, opt_capt, opt_handler);
+
+  // If the listenerObj already has a proxy, it has been set up
+  // previously. We simply return.
+  if (listenerObj.proxy) {
+    return listenerObj;
+  }
+
+  var proxy = goog.events.getProxy();
+  listenerObj.proxy = proxy;
+
+  proxy.src = src;
+  proxy.listener = listenerObj;
+
+  // Attach the proxy through the browser's API
+  if (src.addEventListener) {
+    src.addEventListener(type.toString(), proxy, capture);
+  } else if (src.attachEvent) {
+    // The else if above used to be an unconditional else. It would call
+    // exception on IE11, spoiling the day of some callers. The previous
+    // incarnation of this code, from 2007, indicates that it replaced an
+    // earlier still version that caused excess allocations on IE6.
+    src.attachEvent(goog.events.getOnString_(type.toString()), proxy);
+  } else {
+    throw Error('addEventListener and attachEvent are unavailable.');
+  }
+
+  goog.events.listenerCountEstimate_++;
+  return listenerObj;
+};
+
+
+/**
+ * Helper function for returning a proxy function.
+ * @return {!Function} A new or reused function object.
+ */
+goog.events.getProxy = function() {
+  var proxyCallbackFunction = goog.events.handleBrowserEvent_;
+  // Use a local var f to prevent one allocation.
+  var f = goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT ?
+      function(eventObject) {
+        return proxyCallbackFunction.call(f.src, f.listener, eventObject);
+      } :
+      function(eventObject) {
+        var v = proxyCallbackFunction.call(f.src, f.listener, eventObject);
+        // NOTE(chrishenry): In IE, we hack in a capture phase. However, if
+        // there is inline event handler which tries to prevent default (for
+        // example <a href="..." onclick="return false">...</a>) in a
+        // descendant element, the prevent default will be overridden
+        // by this listener if this listener were to return true. Hence, we
+        // return undefined.
+        if (!v) return v;
+      };
+  return f;
+};
+
+
+/**
+ * Adds an event listener for a specific event on a native event
+ * target (such as a DOM element) or an object that has implemented
+ * {@link goog.events.Listenable}. After the event has fired the event
+ * listener is removed from the target.
+ *
+ * If an existing listener already exists, listenOnce will do
+ * nothing. In particular, if the listener was previously registered
+ * via listen(), listenOnce() will not turn the listener into a
+ * one-off listener. Similarly, if there is already an existing
+ * one-off listener, listenOnce does not modify the listeners (it is
+ * still a once listener).
+ *
+ * @param {EventTarget|goog.events.Listenable} src The node to listen
+ *     to events on.
+ * @param {string|Array<string>|
+ *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}
+ *     type Event type or array of event types.
+ * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(?):?}|null}
+ *     listener Callback method.
+ * @param {boolean=} opt_capt Fire in capture phase?.
+ * @param {T=} opt_handler Element in whose scope to call the listener.
+ * @return {goog.events.Key} Unique key for the listener.
+ * @template T,EVENTOBJ
+ */
+goog.events.listenOnce = function(src, type, listener, opt_capt, opt_handler) {
+  if (goog.isArray(type)) {
+    for (var i = 0; i < type.length; i++) {
+      goog.events.listenOnce(src, type[i], listener, opt_capt, opt_handler);
+    }
+    return null;
+  }
+
+  listener = goog.events.wrapListener(listener);
+  if (goog.events.Listenable.isImplementedBy(src)) {
+    return src.listenOnce(
+        /** @type {string|!goog.events.EventId} */ (type),
+        listener, opt_capt, opt_handler);
+  } else {
+    return goog.events.listen_(
+        /** @type {!EventTarget} */ (src),
+        /** @type {string|!goog.events.EventId} */ (type),
+        listener, /* callOnce */ true, opt_capt, opt_handler);
+  }
+};
+
+
+/**
+ * Adds an event listener with a specific event wrapper on a DOM Node or an
+ * object that has implemented {@link goog.events.Listenable}. A listener can
+ * only be added once to an object.
+ *
+ * @param {EventTarget|goog.events.Listenable} src The target to
+ *     listen to events on.
+ * @param {goog.events.EventWrapper} wrapper Event wrapper to use.
+ * @param {function(this:T, ?):?|{handleEvent:function(?):?}|null} listener
+ *     Callback method, or an object with a handleEvent function.
+ * @param {boolean=} opt_capt Whether to fire in capture phase (defaults to
+ *     false).
+ * @param {T=} opt_handler Element in whose scope to call the listener.
+ * @template T
+ */
+goog.events.listenWithWrapper = function(src, wrapper, listener, opt_capt,
+    opt_handler) {
+  wrapper.listen(src, listener, opt_capt, opt_handler);
+};
+
+
+/**
+ * Removes an event listener which was added with listen().
+ *
+ * @param {EventTarget|goog.events.Listenable} src The target to stop
+ *     listening to events on.
+ * @param {string|Array<string>|
+ *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}
+ *     type Event type or array of event types to unlisten to.
+ * @param {function(?):?|{handleEvent:function(?):?}|null} listener The
+ *     listener function to remove.
+ * @param {boolean=} opt_capt In DOM-compliant browsers, this determines
+ *     whether the listener is fired during the capture or bubble phase of the
+ *     event.
+ * @param {Object=} opt_handler Element in whose scope to call the listener.
+ * @return {?boolean} indicating whether the listener was there to remove.
+ * @template EVENTOBJ
+ */
+goog.events.unlisten = function(src, type, listener, opt_capt, opt_handler) {
+  if (goog.isArray(type)) {
+    for (var i = 0; i < type.length; i++) {
+      goog.events.unlisten(src, type[i], listener, opt_capt, opt_handler);
+    }
+    return null;
+  }
+
+  listener = goog.events.wrapListener(listener);
+  if (goog.events.Listenable.isImplementedBy(src)) {
+    return src.unlisten(
+        /** @type {string|!goog.events.EventId} */ (type),
+        listener, opt_capt, opt_handler);
+  }
+
+  if (!src) {
+    // TODO(chrishenry): We should tighten the API to only accept
+    // non-null objects, or add an assertion here.
+    return false;
+  }
+
+  var capture = !!opt_capt;
+  var listenerMap = goog.events.getListenerMap_(
+      /** @type {!EventTarget} */ (src));
+  if (listenerMap) {
+    var listenerObj = listenerMap.getListener(
+        /** @type {string|!goog.events.EventId} */ (type),
+        listener, capture, opt_handler);
+    if (listenerObj) {
+      return goog.events.unlistenByKey(listenerObj);
+    }
+  }
+
+  return false;
+};
+
+
+/**
+ * Removes an event listener which was added with listen() by the key
+ * returned by listen().
+ *
+ * @param {goog.events.Key} key The key returned by listen() for this
+ *     event listener.
+ * @return {boolean} indicating whether the listener was there to remove.
+ */
+goog.events.unlistenByKey = function(key) {
+  // TODO(chrishenry): Remove this check when tests that rely on this
+  // are fixed.
+  if (goog.isNumber(key)) {
+    return false;
+  }
+
+  var listener = key;
+  if (!listener || listener.removed) {
+    return false;
+  }
+
+  var src = listener.src;
+  if (goog.events.Listenable.isImplementedBy(src)) {
+    return src.unlistenByKey(listener);
+  }
+
+  var type = listener.type;
+  var proxy = listener.proxy;
+  if (src.removeEventListener) {
+    src.removeEventListener(type, proxy, listener.capture);
+  } else if (src.detachEvent) {
+    src.detachEvent(goog.events.getOnString_(type), proxy);
+  }
+  goog.events.listenerCountEstimate_--;
+
+  var listenerMap = goog.events.getListenerMap_(
+      /** @type {!EventTarget} */ (src));
+  // TODO(chrishenry): Try to remove this conditional and execute the
+  // first branch always. This should be safe.
+  if (listenerMap) {
+    listenerMap.removeByKey(listener);
+    if (listenerMap.getTypeCount() == 0) {
+      // Null the src, just because this is simple to do (and useful
+      // for IE <= 7).
+      listenerMap.src = null;
+      // We don't use delete here because IE does not allow delete
+      // on a window object.
+      src[goog.events.LISTENER_MAP_PROP_] = null;
+    }
+  } else {
+    listener.markAsRemoved();
+  }
+
+  return true;
+};
+
+
+/**
+ * Removes an event listener which was added with listenWithWrapper().
+ *
+ * @param {EventTarget|goog.events.Listenable} src The target to stop
+ *     listening to events on.
+ * @param {goog.events.EventWrapper} wrapper Event wrapper to use.
+ * @param {function(?):?|{handleEvent:function(?):?}|null} listener The
+ *     listener function to remove.
+ * @param {boolean=} opt_capt In DOM-compliant browsers, this determines
+ *     whether the listener is fired during the capture or bubble phase of the
+ *     event.
+ * @param {Object=} opt_handler Element in whose scope to call the listener.
+ */
+goog.events.unlistenWithWrapper = function(src, wrapper, listener, opt_capt,
+    opt_handler) {
+  wrapper.unlisten(src, listener, opt_capt, opt_handler);
+};
+
+
+/**
+ * Removes all listeners from an object. You can also optionally
+ * remove listeners of a particular type.
+ *
+ * @param {Object|undefined} obj Object to remove listeners from. Must be an
+ *     EventTarget or a goog.events.Listenable.
+ * @param {string|!goog.events.EventId=} opt_type Type of event to remove.
+ *     Default is all types.
+ * @return {number} Number of listeners removed.
+ */
+goog.events.removeAll = function(obj, opt_type) {
+  // TODO(chrishenry): Change the type of obj to
+  // (!EventTarget|!goog.events.Listenable).
+
+  if (!obj) {
+    return 0;
+  }
+
+  if (goog.events.Listenable.isImplementedBy(obj)) {
+    return obj.removeAllListeners(opt_type);
+  }
+
+  var listenerMap = goog.events.getListenerMap_(
+      /** @type {!EventTarget} */ (obj));
+  if (!listenerMap) {
+    return 0;
+  }
+
+  var count = 0;
+  var typeStr = opt_type && opt_type.toString();
+  for (var type in listenerMap.listeners) {
+    if (!typeStr || type == typeStr) {
+      // Clone so that we don't need to worry about unlistenByKey
+      // changing the content of the ListenerMap.
+      var listeners = listenerMap.listeners[type].concat();
+      for (var i = 0; i < listeners.length; ++i) {
+        if (goog.events.unlistenByKey(listeners[i])) {
+          ++count;
+        }
+      }
+    }
+  }
+  return count;
+};
+
+
+/**
+ * Gets the listeners for a given object, type and capture phase.
+ *
+ * @param {Object} obj Object to get listeners for.
+ * @param {string|!goog.events.EventId} type Event type.
+ * @param {boolean} capture Capture phase?.
+ * @return {Array<goog.events.Listener>} Array of listener objects.
+ */
+goog.events.getListeners = function(obj, type, capture) {
+  if (goog.events.Listenable.isImplementedBy(obj)) {
+    return obj.getListeners(type, capture);
+  } else {
+    if (!obj) {
+      // TODO(chrishenry): We should tighten the API to accept
+      // !EventTarget|goog.events.Listenable, and add an assertion here.
+      return [];
+    }
+
+    var listenerMap = goog.events.getListenerMap_(
+        /** @type {!EventTarget} */ (obj));
+    return listenerMap ? listenerMap.getListeners(type, capture) : [];
+  }
+};
+
+
+/**
+ * Gets the goog.events.Listener for the event or null if no such listener is
+ * in use.
+ *
+ * @param {EventTarget|goog.events.Listenable} src The target from
+ *     which to get listeners.
+ * @param {?string|!goog.events.EventId<EVENTOBJ>} type The type of the event.
+ * @param {function(EVENTOBJ):?|{handleEvent:function(?):?}|null} listener The
+ *     listener function to get.
+ * @param {boolean=} opt_capt In DOM-compliant browsers, this determines
+ *                            whether the listener is fired during the
+ *                            capture or bubble phase of the event.
+ * @param {Object=} opt_handler Element in whose scope to call the listener.
+ * @return {goog.events.ListenableKey} the found listener or null if not found.
+ * @template EVENTOBJ
+ */
+goog.events.getListener = function(src, type, listener, opt_capt, opt_handler) {
+  // TODO(chrishenry): Change type from ?string to string, or add assertion.
+  type = /** @type {string} */ (type);
+  listener = goog.events.wrapListener(listener);
+  var capture = !!opt_capt;
+  if (goog.events.Listenable.isImplementedBy(src)) {
+    return src.getListener(type, listener, capture, opt_handler);
+  }
+
+  if (!src) {
+    // TODO(chrishenry): We should tighten the API to only accept
+    // non-null objects, or add an assertion here.
+    return null;
+  }
+
+  var listenerMap = goog.events.getListenerMap_(
+      /** @type {!EventTarget} */ (src));
+  if (listenerMap) {
+    return listenerMap.getListener(type, listener, capture, opt_handler);
+  }
+  return null;
+};
+
+
+/**
+ * Returns whether an event target has any active listeners matching the
+ * specified signature. If either the type or capture parameters are
+ * unspecified, the function will match on the remaining criteria.
+ *
+ * @param {EventTarget|goog.events.Listenable} obj Target to get
+ *     listeners for.
+ * @param {string|!goog.events.EventId=} opt_type Event type.
+ * @param {boolean=} opt_capture Whether to check for capture or bubble-phase
+ *     listeners.
+ * @return {boolean} Whether an event target has one or more listeners matching
+ *     the requested type and/or capture phase.
+ */
+goog.events.hasListener = function(obj, opt_type, opt_capture) {
+  if (goog.events.Listenable.isImplementedBy(obj)) {
+    return obj.hasListener(opt_type, opt_capture);
+  }
+
+  var listenerMap = goog.events.getListenerMap_(
+      /** @type {!EventTarget} */ (obj));
+  return !!listenerMap && listenerMap.hasListener(opt_type, opt_capture);
+};
+
+
+/**
+ * Provides a nice string showing the normalized event objects public members
+ * @param {Object} e Event Object.
+ * @return {string} String of the public members of the normalized event object.
+ */
+goog.events.expose = function(e) {
+  var str = [];
+  for (var key in e) {
+    if (e[key] && e[key].id) {
+      str.push(key + ' = ' + e[key] + ' (' + e[key].id + ')');
+    } else {
+      str.push(key + ' = ' + e[key]);
+    }
+  }
+  return str.join('\n');
+};
+
+
+/**
+ * Returns a string with on prepended to the specified type. This is used for IE
+ * which expects "on" to be prepended. This function caches the string in order
+ * to avoid extra allocations in steady state.
+ * @param {string} type Event type.
+ * @return {string} The type string with 'on' prepended.
+ * @private
+ */
+goog.events.getOnString_ = function(type) {
+  if (type in goog.events.onStringMap_) {
+    return goog.events.onStringMap_[type];
+  }
+  return goog.events.onStringMap_[type] = goog.events.onString_ + type;
+};
+
+
+/**
+ * Fires an object's listeners of a particular type and phase
+ *
+ * @param {Object} obj Object whose listeners to call.
+ * @param {string|!goog.events.EventId} type Event type.
+ * @param {boolean} capture Which event phase.
+ * @param {Object} eventObject Event object to be passed to listener.
+ * @return {boolean} True if all listeners returned true else false.
+ */
+goog.events.fireListeners = function(obj, type, capture, eventObject) {
+  if (goog.events.Listenable.isImplementedBy(obj)) {
+    return obj.fireListeners(type, capture, eventObject);
+  }
+
+  return goog.events.fireListeners_(obj, type, capture, eventObject);
+};
+
+
+/**
+ * Fires an object's listeners of a particular type and phase.
+ * @param {Object} obj Object whose listeners to call.
+ * @param {string|!goog.events.EventId} type Event type.
+ * @param {boolean} capture Which event phase.
+ * @param {Object} eventObject Event object to be passed to listener.
+ * @return {boolean} True if all listeners returned true else false.
+ * @private
+ */
+goog.events.fireListeners_ = function(obj, type, capture, eventObject) {
+  /** @type {boolean} */
+  var retval = true;
+
+  var listenerMap = goog.events.getListenerMap_(
+      /** @type {EventTarget} */ (obj));
+  if (listenerMap) {
+    // TODO(chrishenry): Original code avoids array creation when there
+    // is no listener, so we do the same. If this optimization turns
+    // out to be not required, we can replace this with
+    // listenerMap.getListeners(type, capture) instead, which is simpler.
+    var listenerArray = listenerMap.listeners[type.toString()];
+    if (listenerArray) {
+      listenerArray = listenerArray.concat();
+      for (var i = 0; i < listenerArray.length; i++) {
+        var listener = listenerArray[i];
+        // We might not have a listener if the listener was removed.
+        if (listener && listener.capture == capture && !listener.removed) {
+          var result = goog.events.fireListener(listener, eventObject);
+          retval = retval && (result !== false);
+        }
+      }
+    }
+  }
+  return retval;
+};
+
+
+/**
+ * Fires a listener with a set of arguments
+ *
+ * @param {goog.events.Listener} listener The listener object to call.
+ * @param {Object} eventObject The event object to pass to the listener.
+ * @return {boolean} Result of listener.
+ */
+goog.events.fireListener = function(listener, eventObject) {
+  var listenerFn = listener.listener;
+  var listenerHandler = listener.handler || listener.src;
+
+  if (listener.callOnce) {
+    goog.events.unlistenByKey(listener);
+  }
+  return listenerFn.call(listenerHandler, eventObject);
+};
+
+
+/**
+ * Gets the total number of listeners currently in the system.
+ * @return {number} Number of listeners.
+ * @deprecated This returns estimated count, now that Closure no longer
+ * stores a central listener registry. We still return an estimation
+ * to keep existing listener-related tests passing. In the near future,
+ * this function will be removed.
+ */
+goog.events.getTotalListenerCount = function() {
+  return goog.events.listenerCountEstimate_;
+};
+
+
+/**
+ * Dispatches an event (or event like object) and calls all listeners
+ * listening for events of this type. The type of the event is decided by the
+ * type property on the event object.
+ *
+ * If any of the listeners returns false OR calls preventDefault then this
+ * function will return false.  If one of the capture listeners calls
+ * stopPropagation, then the bubble listeners won't fire.
+ *
+ * @param {goog.events.Listenable} src The event target.
+ * @param {goog.events.EventLike} e Event object.
+ * @return {boolean} If anyone called preventDefault on the event object (or
+ *     if any of the handlers returns false) this will also return false.
+ *     If there are no handlers, or if all handlers return true, this returns
+ *     true.
+ */
+goog.events.dispatchEvent = function(src, e) {
+  goog.asserts.assert(
+      goog.events.Listenable.isImplementedBy(src),
+      'Can not use goog.events.dispatchEvent with ' +
+      'non-goog.events.Listenable instance.');
+  return src.dispatchEvent(e);
+};
+
+
+/**
+ * Installs exception protection for the browser event entry point using the
+ * given error handler.
+ *
+ * @param {goog.debug.ErrorHandler} errorHandler Error handler with which to
+ *     protect the entry point.
+ */
+goog.events.protectBrowserEventEntryPoint = function(errorHandler) {
+  goog.events.handleBrowserEvent_ = errorHandler.protectEntryPoint(
+      goog.events.handleBrowserEvent_);
+};
+
+
+/**
+ * Handles an event and dispatches it to the correct listeners. This
+ * function is a proxy for the real listener the user specified.
+ *
+ * @param {goog.events.Listener} listener The listener object.
+ * @param {Event=} opt_evt Optional event object that gets passed in via the
+ *     native event handlers.
+ * @return {boolean} Result of the event handler.
+ * @this {EventTarget} The object or Element that fired the event.
+ * @private
+ */
+goog.events.handleBrowserEvent_ = function(listener, opt_evt) {
+  if (listener.removed) {
+    return true;
+  }
+
+  // Synthesize event propagation if the browser does not support W3C
+  // event model.
+  if (!goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT) {
+    var ieEvent = opt_evt ||
+        /** @type {Event} */ (goog.getObjectByName('window.event'));
+    var evt = new goog.events.BrowserEvent(ieEvent, this);
+    /** @type {boolean} */
+    var retval = true;
+
+    if (goog.events.CAPTURE_SIMULATION_MODE ==
+            goog.events.CaptureSimulationMode.ON) {
+      // If we have not marked this event yet, we should perform capture
+      // simulation.
+      if (!goog.events.isMarkedIeEvent_(ieEvent)) {
+        goog.events.markIeEvent_(ieEvent);
+
+        var ancestors = [];
+        for (var parent = evt.currentTarget; parent;
+             parent = parent.parentNode) {
+          ancestors.push(parent);
+        }
+
+        // Fire capture listeners.
+        var type = listener.type;
+        for (var i = ancestors.length - 1; !evt.propagationStopped_ && i >= 0;
+             i--) {
+          evt.currentTarget = ancestors[i];
+          var result = goog.events.fireListeners_(ancestors[i], type, true, evt);
+          retval = retval && result;
+        }
+
+        // Fire bubble listeners.
+        //
+        // We can technically rely on IE to perform bubble event
+        // propagation. However, it turns out that IE fires events in
+        // opposite order of attachEvent registration, which broke
+        // some code and tests that rely on the order. (While W3C DOM
+        // Level 2 Events TR leaves the event ordering unspecified,
+        // modern browsers and W3C DOM Level 3 Events Working Draft
+        // actually specify the order as the registration order.)
+        for (var i = 0; !evt.propagationStopped_ && i < ancestors.length; i++) {
+          evt.currentTarget = ancestors[i];
+          var result = goog.events.fireListeners_(ancestors[i], type, false, evt);
+          retval = retval && result;
+        }
+      }
+    } else {
+      retval = goog.events.fireListener(listener, evt);
+    }
+    return retval;
+  }
+
+  // Otherwise, simply fire the listener.
+  return goog.events.fireListener(
+      listener, new goog.events.BrowserEvent(opt_evt, this));
+};
+
+
+/**
+ * This is used to mark the IE event object so we do not do the Closure pass
+ * twice for a bubbling event.
+ * @param {Event} e The IE browser event.
+ * @private
+ */
+goog.events.markIeEvent_ = function(e) {
+  // Only the keyCode and the returnValue can be changed. We use keyCode for
+  // non keyboard events.
+  // event.returnValue is a bit more tricky. It is undefined by default. A
+  // boolean false prevents the default action. In a window.onbeforeunload and
+  // the returnValue is non undefined it will be alerted. However, we will only
+  // modify the returnValue for keyboard events. We can get a problem if non
+  // closure events sets the keyCode or the returnValue
+
+  var useReturnValue = false;
+
+  if (e.keyCode == 0) {
+    // We cannot change the keyCode in case that srcElement is input[type=file].
+    // We could test that that is the case but that would allocate 3 objects.
+    // If we use try/catch we will only allocate extra objects in the case of a
+    // failure.
+    /** @preserveTry */
+    try {
+      e.keyCode = -1;
+      return;
+    } catch (ex) {
+      useReturnValue = true;
+    }
+  }
+
+  if (useReturnValue ||
+      /** @type {boolean|undefined} */ (e.returnValue) == undefined) {
+    e.returnValue = true;
+  }
+};
+
+
+/**
+ * This is used to check if an IE event has already been handled by the Closure
+ * system so we do not do the Closure pass twice for a bubbling event.
+ * @param {Event} e  The IE browser event.
+ * @return {boolean} True if the event object has been marked.
+ * @private
+ */
+goog.events.isMarkedIeEvent_ = function(e) {
+  return e.keyCode < 0 || e.returnValue != undefined;
+};
+
+
+/**
+ * Counter to create unique event ids.
+ * @private {number}
+ */
+goog.events.uniqueIdCounter_ = 0;
+
+
+/**
+ * Creates a unique event id.
+ *
+ * @param {string} identifier The identifier.
+ * @return {string} A unique identifier.
+ * @idGenerator
+ */
+goog.events.getUniqueId = function(identifier) {
+  return identifier + '_' + goog.events.uniqueIdCounter_++;
+};
+
+
+/**
+ * @param {EventTarget} src The source object.
+ * @return {goog.events.ListenerMap} A listener map for the given
+ *     source object, or null if none exists.
+ * @private
+ */
+goog.events.getListenerMap_ = function(src) {
+  var listenerMap = src[goog.events.LISTENER_MAP_PROP_];
+  // IE serializes the property as well (e.g. when serializing outer
+  // HTML). So we must check that the value is of the correct type.
+  return listenerMap instanceof goog.events.ListenerMap ? listenerMap : null;
+};
+
+
+/**
+ * Expando property for listener function wrapper for Object with
+ * handleEvent.
+ * @private @const {string}
+ */
+goog.events.LISTENER_WRAPPER_PROP_ = '__closure_events_fn_' +
+    ((Math.random() * 1e9) >>> 0);
+
+
+/**
+ * @param {Object|Function} listener The listener function or an
+ *     object that contains handleEvent method.
+ * @return {!Function} Either the original function or a function that
+ *     calls obj.handleEvent. If the same listener is passed to this
+ *     function more than once, the same function is guaranteed to be
+ *     returned.
+ */
+goog.events.wrapListener = function(listener) {
+  goog.asserts.assert(listener, 'Listener can not be null.');
+
+  if (goog.isFunction(listener)) {
+    return listener;
+  }
+
+  goog.asserts.assert(
+      listener.handleEvent, 'An object listener must have handleEvent method.');
+  if (!listener[goog.events.LISTENER_WRAPPER_PROP_]) {
+    listener[goog.events.LISTENER_WRAPPER_PROP_] =
+        function(e) { return listener.handleEvent(e); };
+  }
+  return listener[goog.events.LISTENER_WRAPPER_PROP_];
+};
+
+
+// Register the browser event handler as an entry point, so that
+// it can be monitored for exception handling, etc.
+goog.debug.entryPointRegistry.register(
+    /**
+     * @param {function(!Function): !Function} transformer The transforming
+     *     function.
+     */
+    function(transformer) {
+      goog.events.handleBrowserEvent_ = transformer(
+          goog.events.handleBrowserEvent_);
+    });
+
+// Copyright 2005 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview A disposable implementation of a custom
+ * listenable/event target. See also: documentation for
+ * {@code goog.events.Listenable}.
+ *
+ * @author arv@google.com (Erik Arvidsson) [Original implementation]
+ * @see ../demos/eventtarget.html
+ * @see goog.events.Listenable
+ */
+
+goog.provide('goog.events.EventTarget');
+
+goog.require('goog.Disposable');
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.Event');
+goog.require('goog.events.Listenable');
+goog.require('goog.events.ListenerMap');
+goog.require('goog.object');
+
+
+
+/**
+ * An implementation of {@code goog.events.Listenable} with full W3C
+ * EventTarget-like support (capture/bubble mechanism, stopping event
+ * propagation, preventing default actions).
+ *
+ * You may subclass this class to turn your class into a Listenable.
+ *
+ * Unless propagation is stopped, an event dispatched by an
+ * EventTarget will bubble to the parent returned by
+ * {@code getParentEventTarget}. To set the parent, call
+ * {@code setParentEventTarget}. Subclasses that don't support
+ * changing the parent can override the setter to throw an error.
+ *
+ * Example usage:
+ * <pre>
+ *   var source = new goog.events.EventTarget();
+ *   function handleEvent(e) {
+ *     alert('Type: ' + e.type + '; Target: ' + e.target);
+ *   }
+ *   source.listen('foo', handleEvent);
+ *   // Or: goog.events.listen(source, 'foo', handleEvent);
+ *   ...
+ *   source.dispatchEvent('foo');  // will call handleEvent
+ *   ...
+ *   source.unlisten('foo', handleEvent);
+ *   // Or: goog.events.unlisten(source, 'foo', handleEvent);
+ * </pre>
+ *
+ * @constructor
+ * @extends {goog.Disposable}
+ * @implements {goog.events.Listenable}
+ */
+goog.events.EventTarget = function() {
+  goog.Disposable.call(this);
+
+  /**
+   * Maps of event type to an array of listeners.
+   * @private {!goog.events.ListenerMap}
+   */
+  this.eventTargetListeners_ = new goog.events.ListenerMap(this);
+
+  /**
+   * The object to use for event.target. Useful when mixing in an
+   * EventTarget to another object.
+   * @private {!Object}
+   */
+  this.actualEventTarget_ = this;
+
+  /**
+   * Parent event target, used during event bubbling.
+   *
+   * TODO(chrishenry): Change this to goog.events.Listenable. This
+   * currently breaks people who expect getParentEventTarget to return
+   * goog.events.EventTarget.
+   *
+   * @private {goog.events.EventTarget}
+   */
+  this.parentEventTarget_ = null;
+};
+goog.inherits(goog.events.EventTarget, goog.Disposable);
+goog.events.Listenable.addImplementation(goog.events.EventTarget);
+
+
+/**
+ * An artificial cap on the number of ancestors you can have. This is mainly
+ * for loop detection.
+ * @const {number}
+ * @private
+ */
+goog.events.EventTarget.MAX_ANCESTORS_ = 1000;
+
+
+/**
+ * Returns the parent of this event target to use for bubbling.
+ *
+ * @return {goog.events.EventTarget} The parent EventTarget or null if
+ *     there is no parent.
+ * @override
+ */
+goog.events.EventTarget.prototype.getParentEventTarget = function() {
+  return this.parentEventTarget_;
+};
+
+
+/**
+ * Sets the parent of this event target to use for capture/bubble
+ * mechanism.
+ * @param {goog.events.EventTarget} parent Parent listenable (null if none).
+ */
+goog.events.EventTarget.prototype.setParentEventTarget = function(parent) {
+  this.parentEventTarget_ = parent;
+};
+
+
+/**
+ * Adds an event listener to the event target. The same handler can only be
+ * added once per the type. Even if you add the same handler multiple times
+ * using the same type then it will only be called once when the event is
+ * dispatched.
+ *
+ * @param {string} type The type of the event to listen for.
+ * @param {function(?):?|{handleEvent:function(?):?}|null} handler The function
+ *     to handle the event. The handler can also be an object that implements
+ *     the handleEvent method which takes the event object as argument.
+ * @param {boolean=} opt_capture In DOM-compliant browsers, this determines
+ *     whether the listener is fired during the capture or bubble phase
+ *     of the event.
+ * @param {Object=} opt_handlerScope Object in whose scope to call
+ *     the listener.
+ * @deprecated Use {@code #listen} instead, when possible. Otherwise, use
+ *     {@code goog.events.listen} if you are passing Object
+ *     (instead of Function) as handler.
+ */
+goog.events.EventTarget.prototype.addEventListener = function(
+    type, handler, opt_capture, opt_handlerScope) {
+  goog.events.listen(this, type, handler, opt_capture, opt_handlerScope);
+};
+
+
+/**
+ * Removes an event listener from the event target. The handler must be the
+ * same object as the one added. If the handler has not been added then
+ * nothing is done.
+ *
+ * @param {string} type The type of the event to listen for.
+ * @param {function(?):?|{handleEvent:function(?):?}|null} handler The function
+ *     to handle the event. The handler can also be an object that implements
+ *     the handleEvent method which takes the event object as argument.
+ * @param {boolean=} opt_capture In DOM-compliant browsers, this determines
+ *     whether the listener is fired during the capture or bubble phase
+ *     of the event.
+ * @param {Object=} opt_handlerScope Object in whose scope to call
+ *     the listener.
+ * @deprecated Use {@code #unlisten} instead, when possible. Otherwise, use
+ *     {@code goog.events.unlisten} if you are passing Object
+ *     (instead of Function) as handler.
+ */
+goog.events.EventTarget.prototype.removeEventListener = function(
+    type, handler, opt_capture, opt_handlerScope) {
+  goog.events.unlisten(this, type, handler, opt_capture, opt_handlerScope);
+};
+
+
+/** @override */
+goog.events.EventTarget.prototype.dispatchEvent = function(e) {
+  this.assertInitialized_();
+
+  var ancestorsTree, ancestor = this.getParentEventTarget();
+  if (ancestor) {
+    ancestorsTree = [];
+    var ancestorCount = 1;
+    for (; ancestor; ancestor = ancestor.getParentEventTarget()) {
+      ancestorsTree.push(ancestor);
+      goog.asserts.assert(
+          (++ancestorCount < goog.events.EventTarget.MAX_ANCESTORS_),
+          'infinite loop');
+    }
+  }
+
+  return goog.events.EventTarget.dispatchEventInternal_(
+      this.actualEventTarget_, e, ancestorsTree);
+};
+
+
+/**
+ * Removes listeners from this object.  Classes that extend EventTarget may
+ * need to override this method in order to remove references to DOM Elements
+ * and additional listeners.
+ * @override
+ */
+goog.events.EventTarget.prototype.disposeInternal = function() {
+  goog.events.EventTarget.superClass_.disposeInternal.call(this);
+
+  this.removeAllListeners();
+  this.parentEventTarget_ = null;
+};
+
+
+/** @override */
+goog.events.EventTarget.prototype.listen = function(
+    type, listener, opt_useCapture, opt_listenerScope) {
+  this.assertInitialized_();
+  return this.eventTargetListeners_.add(
+      String(type), listener, false /* callOnce */, opt_useCapture,
+      opt_listenerScope);
+};
+
+
+/** @override */
+goog.events.EventTarget.prototype.listenOnce = function(
+    type, listener, opt_useCapture, opt_listenerScope) {
+  return this.eventTargetListeners_.add(
+      String(type), listener, true /* callOnce */, opt_useCapture,
+      opt_listenerScope);
+};
+
+
+/** @override */
+goog.events.EventTarget.prototype.unlisten = function(
+    type, listener, opt_useCapture, opt_listenerScope) {
+  return this.eventTargetListeners_.remove(
+      String(type), listener, opt_useCapture, opt_listenerScope);
+};
+
+
+/** @override */
+goog.events.EventTarget.prototype.unlistenByKey = function(key) {
+  return this.eventTargetListeners_.removeByKey(key);
+};
+
+
+/** @override */
+goog.events.EventTarget.prototype.removeAllListeners = function(opt_type) {
+  // TODO(chrishenry): Previously, removeAllListeners can be called on
+  // uninitialized EventTarget, so we preserve that behavior. We
+  // should remove this when usages that rely on that fact are purged.
+  if (!this.eventTargetListeners_) {
+    return 0;
+  }
+  return this.eventTargetListeners_.removeAll(opt_type);
+};
+
+
+/** @override */
+goog.events.EventTarget.prototype.fireListeners = function(
+    type, capture, eventObject) {
+  // TODO(chrishenry): Original code avoids array creation when there
+  // is no listener, so we do the same. If this optimization turns
+  // out to be not required, we can replace this with
+  // getListeners(type, capture) instead, which is simpler.
+  var listenerArray = this.eventTargetListeners_.listeners[String(type)];
+  if (!listenerArray) {
+    return true;
+  }
+  listenerArray = listenerArray.concat();
+
+  var rv = true;
+  for (var i = 0; i < listenerArray.length; ++i) {
+    var listener = listenerArray[i];
+    // We might not have a listener if the listener was removed.
+    if (listener && !listener.removed && listener.capture == capture) {
+      var listenerFn = listener.listener;
+      var listenerHandler = listener.handler || listener.src;
+
+      if (listener.callOnce) {
+        this.unlistenByKey(listener);
+      }
+      rv = listenerFn.call(listenerHandler, eventObject) !== false && rv;
+    }
+  }
+
+  return rv && eventObject.returnValue_ != false;
+};
+
+
+/** @override */
+goog.events.EventTarget.prototype.getListeners = function(type, capture) {
+  return this.eventTargetListeners_.getListeners(String(type), capture);
+};
+
+
+/** @override */
+goog.events.EventTarget.prototype.getListener = function(
+    type, listener, capture, opt_listenerScope) {
+  return this.eventTargetListeners_.getListener(
+      String(type), listener, capture, opt_listenerScope);
+};
+
+
+/** @override */
+goog.events.EventTarget.prototype.hasListener = function(
+    opt_type, opt_capture) {
+  var id = goog.isDef(opt_type) ? String(opt_type) : undefined;
+  return this.eventTargetListeners_.hasListener(id, opt_capture);
+};
+
+
+/**
+ * Sets the target to be used for {@code event.target} when firing
+ * event. Mainly used for testing. For example, see
+ * {@code goog.testing.events.mixinListenable}.
+ * @param {!Object} target The target.
+ */
+goog.events.EventTarget.prototype.setTargetForTesting = function(target) {
+  this.actualEventTarget_ = target;
+};
+
+
+/**
+ * Asserts that the event target instance is initialized properly.
+ * @private
+ */
+goog.events.EventTarget.prototype.assertInitialized_ = function() {
+  goog.asserts.assert(
+      this.eventTargetListeners_,
+      'Event target is not initialized. Did you call the superclass ' +
+      '(goog.events.EventTarget) constructor?');
+};
+
+
+/**
+ * Dispatches the given event on the ancestorsTree.
+ *
+ * @param {!Object} target The target to dispatch on.
+ * @param {goog.events.Event|Object|string} e The event object.
+ * @param {Array<goog.events.Listenable>=} opt_ancestorsTree The ancestors
+ *     tree of the target, in reverse order from the closest ancestor
+ *     to the root event target. May be null if the target has no ancestor.
+ * @return {boolean} If anyone called preventDefault on the event object (or
+ *     if any of the listeners returns false) this will also return false.
+ * @private
+ */
+goog.events.EventTarget.dispatchEventInternal_ = function(
+    target, e, opt_ancestorsTree) {
+  var type = e.type || /** @type {string} */ (e);
+
+  // If accepting a string or object, create a custom event object so that
+  // preventDefault and stopPropagation work with the event.
+  if (goog.isString(e)) {
+    e = new goog.events.Event(e, target);
+  } else if (!(e instanceof goog.events.Event)) {
+    var oldEvent = e;
+    e = new goog.events.Event(type, target);
+    goog.object.extend(e, oldEvent);
+  } else {
+    e.target = e.target || target;
+  }
+
+  var rv = true, currentTarget;
+
+  // Executes all capture listeners on the ancestors, if any.
+  if (opt_ancestorsTree) {
+    for (var i = opt_ancestorsTree.length - 1; !e.propagationStopped_ && i >= 0;
+         i--) {
+      currentTarget = e.currentTarget = opt_ancestorsTree[i];
+      rv = currentTarget.fireListeners(type, true, e) && rv;
+    }
+  }
+
+  // Executes capture and bubble listeners on the target.
+  if (!e.propagationStopped_) {
+    currentTarget = e.currentTarget = target;
+    rv = currentTarget.fireListeners(type, true, e) && rv;
+    if (!e.propagationStopped_) {
+      rv = currentTarget.fireListeners(type, false, e) && rv;
+    }
+  }
+
+  // Executes all bubble listeners on the ancestors, if any.
+  if (opt_ancestorsTree) {
+    for (i = 0; !e.propagationStopped_ && i < opt_ancestorsTree.length; i++) {
+      currentTarget = e.currentTarget = opt_ancestorsTree[i];
+      rv = currentTarget.fireListeners(type, false, e) && rv;
+    }
+  }
+
+  return rv;
+};
+
+goog.provide('ol.Observable');
+
+goog.require('goog.events');
+goog.require('goog.events.EventTarget');
+goog.require('goog.events.EventType');
+
+
+
+/**
+ * @classdesc
+ * Abstract base class; normally only used for creating subclasses and not
+ * instantiated in apps.
+ * An event target providing convenient methods for listener registration
+ * and unregistration. A generic `change` event is always available through
+ * {@link ol.Observable#changed}.
+ *
+ * @constructor
+ * @extends {goog.events.EventTarget}
+ * @fires change
+ * @struct
+ * @api stable
+ */
+ol.Observable = function() {
+
+  goog.base(this);
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.revision_ = 0;
+
+};
+goog.inherits(ol.Observable, goog.events.EventTarget);
+
+
+/**
+ * Removes an event listener using the key returned by `on()` or `once()`.
+ * @param {goog.events.Key} key The key returned by `on()` or `once()`.
+ * @api stable
+ */
+ol.Observable.unByKey = function(key) {
+  goog.events.unlistenByKey(key);
+};
+
+
+/**
+ * Increases the revision counter and dispatches a 'change' event.
+ * @api
+ */
+ol.Observable.prototype.changed = function() {
+  ++this.revision_;
+  this.dispatchEvent(goog.events.EventType.CHANGE);
+};
+
+
+/**
+ * Triggered when the revision counter is increased.
+ * @event change
+ * @api
+ */
+
+
+/**
+ * Dispatches an event and calls all listeners listening for events
+ * of this type. The event parameter can either be a string or an
+ * Object with a `type` property.
+ *
+ * @param {goog.events.EventLike} event Event object.
+ * @function
+ * @api
+ */
+ol.Observable.prototype.dispatchEvent;
+
+
+/**
+ * Get the version number for this object.  Each time the object is modified,
+ * its version number will be incremented.
+ * @return {number} Revision.
+ * @api
+ */
+ol.Observable.prototype.getRevision = function() {
+  return this.revision_;
+};
+
+
+/**
+ * Listen for a certain type of event.
+ * @param {string|Array.<string>} type The event type or array of event types.
+ * @param {function(?): ?} listener The listener function.
+ * @param {Object=} opt_this The object to use as `this` in `listener`.
+ * @return {goog.events.Key} Unique key for the listener.
+ * @api stable
+ */
+ol.Observable.prototype.on = function(type, listener, opt_this) {
+  return goog.events.listen(this, type, listener, false, opt_this);
+};
+
+
+/**
+ * Listen once for a certain type of event.
+ * @param {string|Array.<string>} type The event type or array of event types.
+ * @param {function(?): ?} listener The listener function.
+ * @param {Object=} opt_this The object to use as `this` in `listener`.
+ * @return {goog.events.Key} Unique key for the listener.
+ * @api stable
+ */
+ol.Observable.prototype.once = function(type, listener, opt_this) {
+  return goog.events.listenOnce(this, type, listener, false, opt_this);
+};
+
+
+/**
+ * Unlisten for a certain type of event.
+ * @param {string|Array.<string>} type The event type or array of event types.
+ * @param {function(?): ?} listener The listener function.
+ * @param {Object=} opt_this The object which was used as `this` by the
+ * `listener`.
+ * @api stable
+ */
+ol.Observable.prototype.un = function(type, listener, opt_this) {
+  goog.events.unlisten(this, type, listener, false, opt_this);
+};
+
+
+/**
+ * Removes an event listener using the key returned by `on()` or `once()`.
+ * Note that using the {@link ol.Observable.unByKey} static function is to
+ * be preferred.
+ * @param {goog.events.Key} key The key returned by `on()` or `once()`.
+ * @function
+ * @api stable
+ */
+ol.Observable.prototype.unByKey = ol.Observable.unByKey;
+
+goog.provide('ol.Object');
+goog.provide('ol.ObjectEvent');
+goog.provide('ol.ObjectEventType');
+
+goog.require('goog.events');
+goog.require('goog.events.Event');
+goog.require('ol.Observable');
+
+
+/**
+ * @enum {string}
+ */
+ol.ObjectEventType = {
+  /**
+   * Triggered when a property is changed.
+   * @event ol.ObjectEvent#propertychange
+   * @api stable
+   */
+  PROPERTYCHANGE: 'propertychange'
+};
+
+
+
+/**
+ * @classdesc
+ * Events emitted by {@link ol.Object} instances are instances of this type.
+ *
+ * @param {string} type The event type.
+ * @param {string} key The property name.
+ * @param {*} oldValue The old value for `key`.
+ * @extends {goog.events.Event}
+ * @implements {oli.ObjectEvent}
+ * @constructor
+ */
+ol.ObjectEvent = function(type, key, oldValue) {
+  goog.base(this, type);
+
+  /**
+   * The name of the property whose value is changing.
+   * @type {string}
+   * @api stable
+   */
+  this.key = key;
+
+  /**
+   * The old value. To get the new value use `e.target.get(e.key)` where
+   * `e` is the event object.
+   * @type {*}
+   * @api stable
+   */
+  this.oldValue = oldValue;
+
+};
+goog.inherits(ol.ObjectEvent, goog.events.Event);
+
+
+
+/**
+ * @classdesc
+ * Abstract base class; normally only used for creating subclasses and not
+ * instantiated in apps.
+ * Most non-trivial classes inherit from this.
+ *
+ * This extends {@link ol.Observable} with observable properties, where each
+ * property is observable as well as the object as a whole.
+ *
+ * Classes that inherit from this have pre-defined properties, to which you can
+ * add your owns. The pre-defined properties are listed in this documentation as
+ * 'Observable Properties', and have their own accessors; for example,
+ * {@link ol.Map} has a `target` property, accessed with `getTarget()`  and
+ * changed with `setTarget()`. Not all properties are however settable. There
+ * are also general-purpose accessors `get()` and `set()`. For example,
+ * `get('target')` is equivalent to `getTarget()`.
+ *
+ * The `set` accessors trigger a change event, and you can monitor this by
+ * registering a listener. For example, {@link ol.View} has a `center`
+ * property, so `view.on('change:center', function(evt) {...});` would call the
+ * function whenever the value of the center property changes. Within the
+ * function, `evt.target` would be the view, so `evt.target.getCenter()` would
+ * return the new center.
+ *
+ * You can add your own observable properties with
+ * `object.set('prop', 'value')`, and retrieve that with `object.get('prop')`.
+ * You can listen for changes on that property value with
+ * `object.on('change:prop', listener)`. You can get a list of all
+ * properties with {@link ol.Object#getProperties object.getProperties()}.
+ *
+ * Note that the observable properties are separate from standard JS properties.
+ * You can, for example, give your map object a title with
+ * `map.title='New title'` and with `map.set('title', 'Another title')`. The
+ * first will be a `hasOwnProperty`; the second will appear in
+ * `getProperties()`. Only the second is observable.
+ *
+ * Properties can be deleted by using the unset method. E.g.
+ * object.unset('foo').
+ *
+ * @constructor
+ * @extends {ol.Observable}
+ * @param {Object.<string, *>=} opt_values An object with key-value pairs.
+ * @fires ol.ObjectEvent
+ * @api
+ */
+ol.Object = function(opt_values) {
+  goog.base(this);
+
+  // Call goog.getUid to ensure that the order of objects' ids is the same as
+  // the order in which they were created.  This also helps to ensure that
+  // object properties are always added in the same order, which helps many
+  // JavaScript engines generate faster code.
+  goog.getUid(this);
+
+  /**
+   * @private
+   * @type {!Object.<string, *>}
+   */
+  this.values_ = {};
+
+  if (opt_values !== undefined) {
+    this.setProperties(opt_values);
+  }
+};
+goog.inherits(ol.Object, ol.Observable);
+
+
+/**
+ * @private
+ * @type {Object.<string, string>}
+ */
+ol.Object.changeEventTypeCache_ = {};
+
+
+/**
+ * @param {string} key Key name.
+ * @return {string} Change name.
+ */
+ol.Object.getChangeEventType = function(key) {
+  return ol.Object.changeEventTypeCache_.hasOwnProperty(key) ?
+      ol.Object.changeEventTypeCache_[key] :
+      (ol.Object.changeEventTypeCache_[key] = 'change:' + key);
+};
+
+
+/**
+ * Gets a value.
+ * @param {string} key Key name.
+ * @return {*} Value.
+ * @api stable
+ */
+ol.Object.prototype.get = function(key) {
+  var value;
+  if (this.values_.hasOwnProperty(key)) {
+    value = this.values_[key];
+  }
+  return value;
+};
+
+
+/**
+ * Get a list of object property names.
+ * @return {Array.<string>} List of property names.
+ * @api stable
+ */
+ol.Object.prototype.getKeys = function() {
+  return Object.keys(this.values_);
+};
+
+
+/**
+ * Get an object of all property names and values.
+ * @return {Object.<string, *>} Object.
+ * @api stable
+ */
+ol.Object.prototype.getProperties = function() {
+  var properties = {};
+  var key;
+  for (key in this.values_) {
+    properties[key] = this.values_[key];
+  }
+  return properties;
+};
+
+
+/**
+ * @param {string} key Key name.
+ * @param {*} oldValue Old value.
+ */
+ol.Object.prototype.notify = function(key, oldValue) {
+  var eventType;
+  eventType = ol.Object.getChangeEventType(key);
+  this.dispatchEvent(new ol.ObjectEvent(eventType, key, oldValue));
+  eventType = ol.ObjectEventType.PROPERTYCHANGE;
+  this.dispatchEvent(new ol.ObjectEvent(eventType, key, oldValue));
+};
+
+
+/**
+ * Sets a value.
+ * @param {string} key Key name.
+ * @param {*} value Value.
+ * @param {boolean=} opt_silent Update without triggering an event.
+ * @api stable
+ */
+ol.Object.prototype.set = function(key, value, opt_silent) {
+  if (opt_silent) {
+    this.values_[key] = value;
+  } else {
+    var oldValue = this.values_[key];
+    this.values_[key] = value;
+    if (oldValue !== value) {
+      this.notify(key, oldValue);
+    }
+  }
+};
+
+
+/**
+ * Sets a collection of key-value pairs.  Note that this changes any existing
+ * properties and adds new ones (it does not remove any existing properties).
+ * @param {Object.<string, *>} values Values.
+ * @param {boolean=} opt_silent Update without triggering an event.
+ * @api stable
+ */
+ol.Object.prototype.setProperties = function(values, opt_silent) {
+  var key;
+  for (key in values) {
+    this.set(key, values[key], opt_silent);
+  }
+};
+
+
+/**
+ * Unsets a property.
+ * @param {string} key Key name.
+ * @param {boolean=} opt_silent Unset without triggering an event.
+ * @api stable
+ */
+ol.Object.prototype.unset = function(key, opt_silent) {
+  if (key in this.values_) {
+    var oldValue = this.values_[key];
+    delete this.values_[key];
+    if (!opt_silent) {
+      this.notify(key, oldValue);
+    }
+  }
+};
+
+goog.provide('ol.Size');
+goog.provide('ol.size');
+
+
+goog.require('goog.asserts');
+
+
+/**
+ * An array of numbers representing a size: `[width, height]`.
+ * @typedef {Array.<number>}
+ * @api stable
+ */
+ol.Size;
+
+
+/**
+ * Returns a buffered size.
+ * @param {ol.Size} size Size.
+ * @param {number} buffer Buffer.
+ * @param {ol.Size=} opt_size Optional reusable size array.
+ * @return {ol.Size}
+ */
+ol.size.buffer = function(size, buffer, opt_size) {
+  if (opt_size === undefined) {
+    opt_size = [0, 0];
+  }
+  opt_size[0] = size[0] + 2 * buffer;
+  opt_size[1] = size[1] + 2 * buffer;
+  return opt_size;
+};
+
+
+/**
+ * Compares sizes for equality.
+ * @param {ol.Size} a Size.
+ * @param {ol.Size} b Size.
+ * @return {boolean} Equals.
+ */
+ol.size.equals = function(a, b) {
+  return a[0] == b[0] && a[1] == b[1];
+};
+
+
+/**
+ * Determines if a size has a positive area.
+ * @param {ol.Size} size The size to test.
+ * @return {boolean} The size has a positive area.
+ */
+ol.size.hasArea = function(size) {
+  return size[0] > 0 && size[1] > 0;
+};
+
+
+/**
+ * Returns a size scaled by a ratio. The result will be an array of integers.
+ * @param {ol.Size} size Size.
+ * @param {number} ratio Ratio.
+ * @param {ol.Size=} opt_size Optional reusable size array.
+ * @return {ol.Size}
+ */
+ol.size.scale = function(size, ratio, opt_size) {
+  if (opt_size === undefined) {
+    opt_size = [0, 0];
+  }
+  opt_size[0] = (size[0] * ratio + 0.5) | 0;
+  opt_size[1] = (size[1] * ratio + 0.5) | 0;
+  return opt_size;
+};
+
+
+/**
+ * Returns an `ol.Size` array for the passed in number (meaning: square) or
+ * `ol.Size` array.
+ * (meaning: non-square),
+ * @param {number|ol.Size} size Width and height.
+ * @param {ol.Size=} opt_size Optional reusable size array.
+ * @return {ol.Size} Size.
+ * @api stable
+ */
+ol.size.toSize = function(size, opt_size) {
+  if (goog.isArray(size)) {
+    return size;
+  } else {
+    goog.asserts.assert(goog.isNumber(size));
+    if (opt_size === undefined) {
+      opt_size = [size, size];
+    } else {
+      opt_size[0] = size;
+      opt_size[1] = size;
+    }
+    return opt_size;
+  }
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Additional mathematical functions.
+ */
+
+goog.provide('goog.math');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+
+
+/**
+ * Returns a random integer greater than or equal to 0 and less than {@code a}.
+ * @param {number} a  The upper bound for the random integer (exclusive).
+ * @return {number} A random integer N such that 0 <= N < a.
+ */
+goog.math.randomInt = function(a) {
+  return Math.floor(Math.random() * a);
+};
+
+
+/**
+ * Returns a random number greater than or equal to {@code a} and less than
+ * {@code b}.
+ * @param {number} a  The lower bound for the random number (inclusive).
+ * @param {number} b  The upper bound for the random number (exclusive).
+ * @return {number} A random number N such that a <= N < b.
+ */
+goog.math.uniformRandom = function(a, b) {
+  return a + Math.random() * (b - a);
+};
+
+
+/**
+ * Takes a number and clamps it to within the provided bounds.
+ * @param {number} value The input number.
+ * @param {number} min The minimum value to return.
+ * @param {number} max The maximum value to return.
+ * @return {number} The input number if it is within bounds, or the nearest
+ *     number within the bounds.
+ */
+goog.math.clamp = function(value, min, max) {
+  return Math.min(Math.max(value, min), max);
+};
+
+
+/**
+ * The % operator in JavaScript returns the remainder of a / b, but differs from
+ * some other languages in that the result will have the same sign as the
+ * dividend. For example, -1 % 8 == -1, whereas in some other languages
+ * (such as Python) the result would be 7. This function emulates the more
+ * correct modulo behavior, which is useful for certain applications such as
+ * calculating an offset index in a circular list.
+ *
+ * @param {number} a The dividend.
+ * @param {number} b The divisor.
+ * @return {number} a % b where the result is between 0 and b (either 0 <= x < b
+ *     or b < x <= 0, depending on the sign of b).
+ */
+goog.math.modulo = function(a, b) {
+  var r = a % b;
+  // If r and b differ in sign, add b to wrap the result to the correct sign.
+  return (r * b < 0) ? r + b : r;
+};
+
+
+/**
+ * Performs linear interpolation between values a and b. Returns the value
+ * between a and b proportional to x (when x is between 0 and 1. When x is
+ * outside this range, the return value is a linear extrapolation).
+ * @param {number} a A number.
+ * @param {number} b A number.
+ * @param {number} x The proportion between a and b.
+ * @return {number} The interpolated value between a and b.
+ */
+goog.math.lerp = function(a, b, x) {
+  return a + x * (b - a);
+};
+
+
+/**
+ * Tests whether the two values are equal to each other, within a certain
+ * tolerance to adjust for floating point errors.
+ * @param {number} a A number.
+ * @param {number} b A number.
+ * @param {number=} opt_tolerance Optional tolerance range. Defaults
+ *     to 0.000001. If specified, should be greater than 0.
+ * @return {boolean} Whether {@code a} and {@code b} are nearly equal.
+ */
+goog.math.nearlyEquals = function(a, b, opt_tolerance) {
+  return Math.abs(a - b) <= (opt_tolerance || 0.000001);
+};
+
+
+// TODO(user): Rename to normalizeAngle, retaining old name as deprecated
+// alias.
+/**
+ * Normalizes an angle to be in range [0-360). Angles outside this range will
+ * be normalized to be the equivalent angle with that range.
+ * @param {number} angle Angle in degrees.
+ * @return {number} Standardized angle.
+ */
+goog.math.standardAngle = function(angle) {
+  return goog.math.modulo(angle, 360);
+};
+
+
+/**
+ * Normalizes an angle to be in range [0-2*PI). Angles outside this range will
+ * be normalized to be the equivalent angle with that range.
+ * @param {number} angle Angle in radians.
+ * @return {number} Standardized angle.
+ */
+goog.math.standardAngleInRadians = function(angle) {
+  return goog.math.modulo(angle, 2 * Math.PI);
+};
+
+
+/**
+ * Converts degrees to radians.
+ * @param {number} angleDegrees Angle in degrees.
+ * @return {number} Angle in radians.
+ */
+goog.math.toRadians = function(angleDegrees) {
+  return angleDegrees * Math.PI / 180;
+};
+
+
+/**
+ * Converts radians to degrees.
+ * @param {number} angleRadians Angle in radians.
+ * @return {number} Angle in degrees.
+ */
+goog.math.toDegrees = function(angleRadians) {
+  return angleRadians * 180 / Math.PI;
+};
+
+
+/**
+ * For a given angle and radius, finds the X portion of the offset.
+ * @param {number} degrees Angle in degrees (zero points in +X direction).
+ * @param {number} radius Radius.
+ * @return {number} The x-distance for the angle and radius.
+ */
+goog.math.angleDx = function(degrees, radius) {
+  return radius * Math.cos(goog.math.toRadians(degrees));
+};
+
+
+/**
+ * For a given angle and radius, finds the Y portion of the offset.
+ * @param {number} degrees Angle in degrees (zero points in +X direction).
+ * @param {number} radius Radius.
+ * @return {number} The y-distance for the angle and radius.
+ */
+goog.math.angleDy = function(degrees, radius) {
+  return radius * Math.sin(goog.math.toRadians(degrees));
+};
+
+
+/**
+ * Computes the angle between two points (x1,y1) and (x2,y2).
+ * Angle zero points in the +X direction, 90 degrees points in the +Y
+ * direction (down) and from there we grow clockwise towards 360 degrees.
+ * @param {number} x1 x of first point.
+ * @param {number} y1 y of first point.
+ * @param {number} x2 x of second point.
+ * @param {number} y2 y of second point.
+ * @return {number} Standardized angle in degrees of the vector from
+ *     x1,y1 to x2,y2.
+ */
+goog.math.angle = function(x1, y1, x2, y2) {
+  return goog.math.standardAngle(goog.math.toDegrees(Math.atan2(y2 - y1,
+                                                                x2 - x1)));
+};
+
+
+/**
+ * Computes the difference between startAngle and endAngle (angles in degrees).
+ * @param {number} startAngle  Start angle in degrees.
+ * @param {number} endAngle  End angle in degrees.
+ * @return {number} The number of degrees that when added to
+ *     startAngle will result in endAngle. Positive numbers mean that the
+ *     direction is clockwise. Negative numbers indicate a counter-clockwise
+ *     direction.
+ *     The shortest route (clockwise vs counter-clockwise) between the angles
+ *     is used.
+ *     When the difference is 180 degrees, the function returns 180 (not -180)
+ *     angleDifference(30, 40) is 10, and angleDifference(40, 30) is -10.
+ *     angleDifference(350, 10) is 20, and angleDifference(10, 350) is -20.
+ */
+goog.math.angleDifference = function(startAngle, endAngle) {
+  var d = goog.math.standardAngle(endAngle) -
+          goog.math.standardAngle(startAngle);
+  if (d > 180) {
+    d = d - 360;
+  } else if (d <= -180) {
+    d = 360 + d;
+  }
+  return d;
+};
+
+
+/**
+ * Returns the sign of a number as per the "sign" or "signum" function.
+ * @param {number} x The number to take the sign of.
+ * @return {number} -1 when negative, 1 when positive, 0 when 0. Preserves
+ *     signed zeros and NaN.
+ */
+goog.math.sign = Math.sign || function(x) {
+  if (x > 0) {
+    return 1;
+  }
+  if (x < 0) {
+    return -1;
+  }
+  return x;  // Preserves signed zeros and NaN.
+};
+
+
+/**
+ * JavaScript implementation of Longest Common Subsequence problem.
+ * http://en.wikipedia.org/wiki/Longest_common_subsequence
+ *
+ * Returns the longest possible array that is subarray of both of given arrays.
+ *
+ * @param {Array<Object>} array1 First array of objects.
+ * @param {Array<Object>} array2 Second array of objects.
+ * @param {Function=} opt_compareFn Function that acts as a custom comparator
+ *     for the array ojects. Function should return true if objects are equal,
+ *     otherwise false.
+ * @param {Function=} opt_collectorFn Function used to decide what to return
+ *     as a result subsequence. It accepts 2 arguments: index of common element
+ *     in the first array and index in the second. The default function returns
+ *     element from the first array.
+ * @return {!Array<Object>} A list of objects that are common to both arrays
+ *     such that there is no common subsequence with size greater than the
+ *     length of the list.
+ */
+goog.math.longestCommonSubsequence = function(
+    array1, array2, opt_compareFn, opt_collectorFn) {
+
+  var compare = opt_compareFn || function(a, b) {
+    return a == b;
+  };
+
+  var collect = opt_collectorFn || function(i1, i2) {
+    return array1[i1];
+  };
+
+  var length1 = array1.length;
+  var length2 = array2.length;
+
+  var arr = [];
+  for (var i = 0; i < length1 + 1; i++) {
+    arr[i] = [];
+    arr[i][0] = 0;
+  }
+
+  for (var j = 0; j < length2 + 1; j++) {
+    arr[0][j] = 0;
+  }
+
+  for (i = 1; i <= length1; i++) {
+    for (j = 1; j <= length2; j++) {
+      if (compare(array1[i - 1], array2[j - 1])) {
+        arr[i][j] = arr[i - 1][j - 1] + 1;
+      } else {
+        arr[i][j] = Math.max(arr[i - 1][j], arr[i][j - 1]);
+      }
+    }
+  }
+
+  // Backtracking
+  var result = [];
+  var i = length1, j = length2;
+  while (i > 0 && j > 0) {
+    if (compare(array1[i - 1], array2[j - 1])) {
+      result.unshift(collect(i - 1, j - 1));
+      i--;
+      j--;
+    } else {
+      if (arr[i - 1][j] > arr[i][j - 1]) {
+        i--;
+      } else {
+        j--;
+      }
+    }
+  }
+
+  return result;
+};
+
+
+/**
+ * Returns the sum of the arguments.
+ * @param {...number} var_args Numbers to add.
+ * @return {number} The sum of the arguments (0 if no arguments were provided,
+ *     {@code NaN} if any of the arguments is not a valid number).
+ */
+goog.math.sum = function(var_args) {
+  return /** @type {number} */ (goog.array.reduce(arguments,
+      function(sum, value) {
+        return sum + value;
+      }, 0));
+};
+
+
+/**
+ * Returns the arithmetic mean of the arguments.
+ * @param {...number} var_args Numbers to average.
+ * @return {number} The average of the arguments ({@code NaN} if no arguments
+ *     were provided or any of the arguments is not a valid number).
+ */
+goog.math.average = function(var_args) {
+  return goog.math.sum.apply(null, arguments) / arguments.length;
+};
+
+
+/**
+ * Returns the unbiased sample variance of the arguments. For a definition,
+ * see e.g. http://en.wikipedia.org/wiki/Variance
+ * @param {...number} var_args Number samples to analyze.
+ * @return {number} The unbiased sample variance of the arguments (0 if fewer
+ *     than two samples were provided, or {@code NaN} if any of the samples is
+ *     not a valid number).
+ */
+goog.math.sampleVariance = function(var_args) {
+  var sampleSize = arguments.length;
+  if (sampleSize < 2) {
+    return 0;
+  }
+
+  var mean = goog.math.average.apply(null, arguments);
+  var variance = goog.math.sum.apply(null, goog.array.map(arguments,
+      function(val) {
+        return Math.pow(val - mean, 2);
+      })) / (sampleSize - 1);
+
+  return variance;
+};
+
+
+/**
+ * Returns the sample standard deviation of the arguments.  For a definition of
+ * sample standard deviation, see e.g.
+ * http://en.wikipedia.org/wiki/Standard_deviation
+ * @param {...number} var_args Number samples to analyze.
+ * @return {number} The sample standard deviation of the arguments (0 if fewer
+ *     than two samples were provided, or {@code NaN} if any of the samples is
+ *     not a valid number).
+ */
+goog.math.standardDeviation = function(var_args) {
+  return Math.sqrt(goog.math.sampleVariance.apply(null, arguments));
+};
+
+
+/**
+ * Returns whether the supplied number represents an integer, i.e. that is has
+ * no fractional component.  No range-checking is performed on the number.
+ * @param {number} num The number to test.
+ * @return {boolean} Whether {@code num} is an integer.
+ */
+goog.math.isInt = function(num) {
+  return isFinite(num) && num % 1 == 0;
+};
+
+
+/**
+ * Returns whether the supplied number is finite and not NaN.
+ * @param {number} num The number to test.
+ * @return {boolean} Whether {@code num} is a finite number.
+ */
+goog.math.isFiniteNumber = function(num) {
+  return isFinite(num) && !isNaN(num);
+};
+
+
+/**
+ * @param {number} num The number to test.
+ * @return {boolean} Whether it is negative zero.
+ */
+goog.math.isNegativeZero = function(num) {
+  return num == 0 && 1 / num < 0;
+};
+
+
+/**
+ * Returns the precise value of floor(log10(num)).
+ * Simpler implementations didn't work because of floating point rounding
+ * errors. For example
+ * <ul>
+ * <li>Math.floor(Math.log(num) / Math.LN10) is off by one for num == 1e+3.
+ * <li>Math.floor(Math.log(num) * Math.LOG10E) is off by one for num == 1e+15.
+ * <li>Math.floor(Math.log10(num)) is off by one for num == 1e+15 - 1.
+ * </ul>
+ * @param {number} num A floating point number.
+ * @return {number} Its logarithm to base 10 rounded down to the nearest
+ *     integer if num > 0. -Infinity if num == 0. NaN if num < 0.
+ */
+goog.math.log10Floor = function(num) {
+  if (num > 0) {
+    var x = Math.round(Math.log(num) * Math.LOG10E);
+    return x - (parseFloat('1e' + x) > num);
+  }
+  return num == 0 ? -Infinity : NaN;
+};
+
+
+/**
+ * A tweaked variant of {@code Math.floor} which tolerates if the passed number
+ * is infinitesimally smaller than the closest integer. It often happens with
+ * the results of floating point calculations because of the finite precision
+ * of the intermediate results. For example {@code Math.floor(Math.log(1000) /
+ * Math.LN10) == 2}, not 3 as one would expect.
+ * @param {number} num A number.
+ * @param {number=} opt_epsilon An infinitesimally small positive number, the
+ *     rounding error to tolerate.
+ * @return {number} The largest integer less than or equal to {@code num}.
+ */
+goog.math.safeFloor = function(num, opt_epsilon) {
+  goog.asserts.assert(!goog.isDef(opt_epsilon) || opt_epsilon > 0);
+  return Math.floor(num + (opt_epsilon || 2e-15));
+};
+
+
+/**
+ * A tweaked variant of {@code Math.ceil}. See {@code goog.math.safeFloor} for
+ * details.
+ * @param {number} num A number.
+ * @param {number=} opt_epsilon An infinitesimally small positive number, the
+ *     rounding error to tolerate.
+ * @return {number} The smallest integer greater than or equal to {@code num}.
+ */
+goog.math.safeCeil = function(num, opt_epsilon) {
+  goog.asserts.assert(!goog.isDef(opt_epsilon) || opt_epsilon > 0);
+  return Math.ceil(num - (opt_epsilon || 2e-15));
+};
+
+goog.provide('ol.Coordinate');
+goog.provide('ol.CoordinateFormatType');
+goog.provide('ol.coordinate');
+
+goog.require('goog.math');
+goog.require('goog.string');
+
+
+/**
+ * A function that takes a {@link ol.Coordinate} and transforms it into a
+ * `{string}`.
+ *
+ * @typedef {function((ol.Coordinate|undefined)): string}
+ * @api stable
+ */
+ol.CoordinateFormatType;
+
+
+/**
+ * An array of numbers representing an xy coordinate. Example: `[16, 48]`.
+ * @typedef {Array.<number>} ol.Coordinate
+ * @api stable
+ */
+ol.Coordinate;
+
+
+/**
+ * Add `delta` to `coordinate`. `coordinate` is modified in place and returned
+ * by the function.
+ *
+ * Example:
+ *
+ *     var coord = [7.85, 47.983333];
+ *     ol.coordinate.add(coord, [-2, 4]);
+ *     // coord is now [5.85, 51.983333]
+ *
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {ol.Coordinate} delta Delta.
+ * @return {ol.Coordinate} The input coordinate adjusted by the given delta.
+ * @api stable
+ */
+ol.coordinate.add = function(coordinate, delta) {
+  coordinate[0] += delta[0];
+  coordinate[1] += delta[1];
+  return coordinate;
+};
+
+
+/**
+ * Calculates the point closest to the passed coordinate on the passed segment.
+ * This is the foot of the perpendicular of the coordinate to the segment when
+ * the foot is on the segment, or the closest segment coordinate when the foot
+ * is outside the segment.
+ *
+ * @param {ol.Coordinate} coordinate The coordinate.
+ * @param {Array.<ol.Coordinate>} segment The two coordinates of the segment.
+ * @return {ol.Coordinate} The foot of the perpendicular of the coordinate to
+ *     the segment.
+ */
+ol.coordinate.closestOnSegment = function(coordinate, segment) {
+  var x0 = coordinate[0];
+  var y0 = coordinate[1];
+  var start = segment[0];
+  var end = segment[1];
+  var x1 = start[0];
+  var y1 = start[1];
+  var x2 = end[0];
+  var y2 = end[1];
+  var dx = x2 - x1;
+  var dy = y2 - y1;
+  var along = (dx === 0 && dy === 0) ? 0 :
+      ((dx * (x0 - x1)) + (dy * (y0 - y1))) / ((dx * dx + dy * dy) || 0);
+  var x, y;
+  if (along <= 0) {
+    x = x1;
+    y = y1;
+  } else if (along >= 1) {
+    x = x2;
+    y = y2;
+  } else {
+    x = x1 + along * dx;
+    y = y1 + along * dy;
+  }
+  return [x, y];
+};
+
+
+/**
+ * Returns a {@link ol.CoordinateFormatType} function that can be used to format
+ * a {ol.Coordinate} to a string.
+ *
+ * Example without specifying the fractional digits:
+ *
+ *     var coord = [7.85, 47.983333];
+ *     var stringifyFunc = ol.coordinate.createStringXY();
+ *     var out = stringifyFunc(coord);
+ *     // out is now '8, 48'
+ *
+ * Example with explicitly specifying 2 fractional digits:
+ *
+ *     var coord = [7.85, 47.983333];
+ *     var stringifyFunc = ol.coordinate.createStringXY(2);
+ *     var out = stringifyFunc(coord);
+ *     // out is now '7.85, 47.98'
+ *
+ * @param {number=} opt_fractionDigits The number of digits to include
+ *    after the decimal point. Default is `0`.
+ * @return {ol.CoordinateFormatType} Coordinate format.
+ * @api stable
+ */
+ol.coordinate.createStringXY = function(opt_fractionDigits) {
+  return (
+      /**
+       * @param {ol.Coordinate|undefined} coordinate Coordinate.
+       * @return {string} String XY.
+       */
+      function(coordinate) {
+        return ol.coordinate.toStringXY(coordinate, opt_fractionDigits);
+      });
+};
+
+
+/**
+ * @private
+ * @param {number} degrees Degrees.
+ * @param {string} hemispheres Hemispheres.
+ * @return {string} String.
+ */
+ol.coordinate.degreesToStringHDMS_ = function(degrees, hemispheres) {
+  var normalizedDegrees = goog.math.modulo(degrees + 180, 360) - 180;
+  var x = Math.abs(Math.round(3600 * normalizedDegrees));
+  return Math.floor(x / 3600) + '\u00b0 ' +
+      goog.string.padNumber(Math.floor((x / 60) % 60), 2) + '\u2032 ' +
+      goog.string.padNumber(Math.floor(x % 60), 2) + '\u2033 ' +
+      hemispheres.charAt(normalizedDegrees < 0 ? 1 : 0);
+};
+
+
+/**
+ * Transforms the given {@link ol.Coordinate} to a string using the given string
+ * template. The strings `{x}` and `{y}` in the template will be replaced with
+ * the first and second coordinate values respectively.
+ *
+ * Example without specifying the fractional digits:
+ *
+ *     var coord = [7.85, 47.983333];
+ *     var template = 'Coordinate is ({x}|{y}).';
+ *     var out = ol.coordinate.format(coord, template);
+ *     // out is now 'Coordinate is (8|48).'
+ *
+ * Example explicitly specifying the fractional digits:
+ *
+ *     var coord = [7.85, 47.983333];
+ *     var template = 'Coordinate is ({x}|{y}).';
+ *     var out = ol.coordinate.format(coord, template, 2);
+ *     // out is now 'Coordinate is (7.85|47.98).'
+ *
+ * @param {ol.Coordinate|undefined} coordinate Coordinate.
+ * @param {string} template A template string with `{x}` and `{y}` placeholders
+ *     that will be replaced by first and second coordinate values.
+ * @param {number=} opt_fractionDigits The number of digits to include
+ *    after the decimal point. Default is `0`.
+ * @return {string} Formatted coordinate.
+ * @api stable
+ */
+ol.coordinate.format = function(coordinate, template, opt_fractionDigits) {
+  if (coordinate) {
+    return template
+      .replace('{x}', coordinate[0].toFixed(opt_fractionDigits))
+      .replace('{y}', coordinate[1].toFixed(opt_fractionDigits));
+  } else {
+    return '';
+  }
+};
+
+
+/**
+ * @param {ol.Coordinate} coordinate1 First coordinate.
+ * @param {ol.Coordinate} coordinate2 Second coordinate.
+ * @return {boolean} Whether the passed coordinates are equal.
+ */
+ol.coordinate.equals = function(coordinate1, coordinate2) {
+  var equals = true;
+  for (var i = coordinate1.length - 1; i >= 0; --i) {
+    if (coordinate1[i] != coordinate2[i]) {
+      equals = false;
+      break;
+    }
+  }
+  return equals;
+};
+
+
+/**
+ * Rotate `coordinate` by `angle`. `coordinate` is modified in place and
+ * returned by the function.
+ *
+ * Example:
+ *
+ *     var coord = [7.85, 47.983333];
+ *     var rotateRadians = Math.PI / 2; // 90 degrees
+ *     ol.coordinate.rotate(coord, rotateRadians);
+ *     // coord is now [-47.983333, 7.85]
+ *
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {number} angle Angle in radian.
+ * @return {ol.Coordinate} Coordinate.
+ * @api stable
+ */
+ol.coordinate.rotate = function(coordinate, angle) {
+  var cosAngle = Math.cos(angle);
+  var sinAngle = Math.sin(angle);
+  var x = coordinate[0] * cosAngle - coordinate[1] * sinAngle;
+  var y = coordinate[1] * cosAngle + coordinate[0] * sinAngle;
+  coordinate[0] = x;
+  coordinate[1] = y;
+  return coordinate;
+};
+
+
+/**
+ * Scale `coordinate` by `scale`. `coordinate` is modified in place and returned
+ * by the function.
+ *
+ * Example:
+ *
+ *     var coord = [7.85, 47.983333];
+ *     var scale = 1.2;
+ *     ol.coordinate.scale(coord, scale);
+ *     // coord is now [9.42, 57.5799996]
+ *
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {number} scale Scale factor.
+ * @return {ol.Coordinate} Coordinate.
+ */
+ol.coordinate.scale = function(coordinate, scale) {
+  coordinate[0] *= scale;
+  coordinate[1] *= scale;
+  return coordinate;
+};
+
+
+/**
+ * Subtract `delta` to `coordinate`. `coordinate` is modified in place and
+ * returned by the function.
+ *
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {ol.Coordinate} delta Delta.
+ * @return {ol.Coordinate} Coordinate.
+ */
+ol.coordinate.sub = function(coordinate, delta) {
+  coordinate[0] -= delta[0];
+  coordinate[1] -= delta[1];
+  return coordinate;
+};
+
+
+/**
+ * @param {ol.Coordinate} coord1 First coordinate.
+ * @param {ol.Coordinate} coord2 Second coordinate.
+ * @return {number} Squared distance between coord1 and coord2.
+ */
+ol.coordinate.squaredDistance = function(coord1, coord2) {
+  var dx = coord1[0] - coord2[0];
+  var dy = coord1[1] - coord2[1];
+  return dx * dx + dy * dy;
+};
+
+
+/**
+ * Calculate the squared distance from a coordinate to a line segment.
+ *
+ * @param {ol.Coordinate} coordinate Coordinate of the point.
+ * @param {Array.<ol.Coordinate>} segment Line segment (2 coordinates).
+ * @return {number} Squared distance from the point to the line segment.
+ */
+ol.coordinate.squaredDistanceToSegment = function(coordinate, segment) {
+  return ol.coordinate.squaredDistance(coordinate,
+      ol.coordinate.closestOnSegment(coordinate, segment));
+};
+
+
+/**
+ * Format a geographic coordinate with the hemisphere, degrees, minutes, and
+ * seconds.
+ *
+ * Example:
+ *
+ *     var coord = [7.85, 47.983333];
+ *     var out = ol.coordinate.toStringHDMS(coord);
+ *     // out is now '47° 59′ 0″ N 7° 51′ 0″ E'
+ *
+ * @param {ol.Coordinate|undefined} coordinate Coordinate.
+ * @return {string} Hemisphere, degrees, minutes and seconds.
+ * @api stable
+ */
+ol.coordinate.toStringHDMS = function(coordinate) {
+  if (coordinate) {
+    return ol.coordinate.degreesToStringHDMS_(coordinate[1], 'NS') + ' ' +
+        ol.coordinate.degreesToStringHDMS_(coordinate[0], 'EW');
+  } else {
+    return '';
+  }
+};
+
+
+/**
+ * Format a coordinate as a comma delimited string.
+ *
+ * Example without specifying fractional digits:
+ *
+ *     var coord = [7.85, 47.983333];
+ *     var out = ol.coordinate.toStringXY(coord);
+ *     // out is now '8, 48'
+ *
+ * Example explicitly specifying 1 fractional digit:
+ *
+ *     var coord = [7.85, 47.983333];
+ *     var out = ol.coordinate.toStringXY(coord, 1);
+ *     // out is now '7.8, 48.0'
+ *
+ * @param {ol.Coordinate|undefined} coordinate Coordinate.
+ * @param {number=} opt_fractionDigits The number of digits to include
+ *    after the decimal point. Default is `0`.
+ * @return {string} XY.
+ * @api stable
+ */
+ol.coordinate.toStringXY = function(coordinate, opt_fractionDigits) {
+  return ol.coordinate.format(coordinate, '{x}, {y}', opt_fractionDigits);
+};
+
+
+/**
+ * Create an ol.Coordinate from an Array and take into account axis order.
+ *
+ * Examples:
+ *
+ *     var northCoord = ol.coordinate.fromProjectedArray([1, 2], 'n');
+ *     // northCoord is now [2, 1]
+ *
+ *     var eastCoord = ol.coordinate.fromProjectedArray([1, 2], 'e');
+ *     // eastCoord is now [1, 2]
+ *
+ * @param {Array} array The array with coordinates.
+ * @param {string} axis the axis info.
+ * @return {ol.Coordinate} The coordinate created.
+ */
+ol.coordinate.fromProjectedArray = function(array, axis) {
+  var firstAxis = axis.charAt(0);
+  if (firstAxis === 'n' || firstAxis === 's') {
+    return [array[1], array[0]];
+  } else {
+    return array;
+  }
+};
+
+// Copyright 2011 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+/**
+ * @fileoverview Supplies a Float32Array implementation that implements
+ *     most of the Float32Array spec and that can be used when a built-in
+ *     implementation is not available.
+ *
+ *     Note that if no existing Float32Array implementation is found then
+ *     this class and all its public properties are exported as Float32Array.
+ *
+ *     Adding support for the other TypedArray classes here does not make sense
+ *     since this vector math library only needs Float32Array.
+ *
+ */
+goog.provide('goog.vec.Float32Array');
+
+
+
+/**
+ * Constructs a new Float32Array. The new array is initialized to all zeros.
+ *
+ * @param {goog.vec.Float32Array|Array|ArrayBuffer|number} p0
+ *     The length of the array, or an array to initialize the contents of the
+ *     new Float32Array.
+ * @constructor
+ * @final
+ */
+goog.vec.Float32Array = function(p0) {
+  this.length = /** @type {number} */ (p0.length || p0);
+  for (var i = 0; i < this.length; i++) {
+    this[i] = p0[i] || 0;
+  }
+};
+
+
+/**
+ * The number of bytes in an element (as defined by the Typed Array
+ * specification).
+ *
+ * @type {number}
+ */
+goog.vec.Float32Array.BYTES_PER_ELEMENT = 4;
+
+
+/**
+ * The number of bytes in an element (as defined by the Typed Array
+ * specification).
+ *
+ * @type {number}
+ */
+goog.vec.Float32Array.prototype.BYTES_PER_ELEMENT = 4;
+
+
+/**
+ * Sets elements of the array.
+ * @param {Array<number>|Float32Array} values The array of values.
+ * @param {number=} opt_offset The offset in this array to start.
+ */
+goog.vec.Float32Array.prototype.set = function(values, opt_offset) {
+  opt_offset = opt_offset || 0;
+  for (var i = 0; i < values.length && opt_offset + i < this.length; i++) {
+    this[opt_offset + i] = values[i];
+  }
+};
+
+
+/**
+ * Creates a string representation of this array.
+ * @return {string} The string version of this array.
+ * @override
+ */
+goog.vec.Float32Array.prototype.toString = Array.prototype.join;
+
+
+/**
+ * Note that we cannot implement the subarray() or (deprecated) slice()
+ * methods properly since doing so would require being able to overload
+ * the [] operator which is not possible in javascript.  So we leave
+ * them unimplemented.  Any attempt to call these methods will just result
+ * in a javascript error since we leave them undefined.
+ */
+
+
+/**
+ * If no existing Float32Array implementation is found then we export
+ * goog.vec.Float32Array as Float32Array.
+ */
+if (typeof Float32Array == 'undefined') {
+  goog.exportProperty(goog.vec.Float32Array, 'BYTES_PER_ELEMENT',
+                      goog.vec.Float32Array.BYTES_PER_ELEMENT);
+  goog.exportProperty(goog.vec.Float32Array.prototype, 'BYTES_PER_ELEMENT',
+                      goog.vec.Float32Array.prototype.BYTES_PER_ELEMENT);
+  goog.exportProperty(goog.vec.Float32Array.prototype, 'set',
+                      goog.vec.Float32Array.prototype.set);
+  goog.exportProperty(goog.vec.Float32Array.prototype, 'toString',
+                      goog.vec.Float32Array.prototype.toString);
+  goog.exportSymbol('Float32Array', goog.vec.Float32Array);
+}
+
+// Copyright 2011 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+/**
+ * @fileoverview Supplies a Float64Array implementation that implements
+ * most of the Float64Array spec and that can be used when a built-in
+ * implementation is not available.
+ *
+ * Note that if no existing Float64Array implementation is found then this
+ * class and all its public properties are exported as Float64Array.
+ *
+ * Adding support for the other TypedArray classes here does not make sense
+ * since this vector math library only needs Float32Array and Float64Array.
+ *
+ */
+goog.provide('goog.vec.Float64Array');
+
+
+
+/**
+ * Constructs a new Float64Array. The new array is initialized to all zeros.
+ *
+ * @param {goog.vec.Float64Array|Array|ArrayBuffer|number} p0
+ *     The length of the array, or an array to initialize the contents of the
+ *     new Float64Array.
+ * @constructor
+ * @final
+ */
+goog.vec.Float64Array = function(p0) {
+  this.length = /** @type {number} */ (p0.length || p0);
+  for (var i = 0; i < this.length; i++) {
+    this[i] = p0[i] || 0;
+  }
+};
+
+
+/**
+ * The number of bytes in an element (as defined by the Typed Array
+ * specification).
+ *
+ * @type {number}
+ */
+goog.vec.Float64Array.BYTES_PER_ELEMENT = 8;
+
+
+/**
+ * The number of bytes in an element (as defined by the Typed Array
+ * specification).
+ *
+ * @type {number}
+ */
+goog.vec.Float64Array.prototype.BYTES_PER_ELEMENT = 8;
+
+
+/**
+ * Sets elements of the array.
+ * @param {Array<number>|Float64Array} values The array of values.
+ * @param {number=} opt_offset The offset in this array to start.
+ */
+goog.vec.Float64Array.prototype.set = function(values, opt_offset) {
+  opt_offset = opt_offset || 0;
+  for (var i = 0; i < values.length && opt_offset + i < this.length; i++) {
+    this[opt_offset + i] = values[i];
+  }
+};
+
+
+/**
+ * Creates a string representation of this array.
+ * @return {string} The string version of this array.
+ * @override
+ */
+goog.vec.Float64Array.prototype.toString = Array.prototype.join;
+
+
+/**
+ * Note that we cannot implement the subarray() or (deprecated) slice()
+ * methods properly since doing so would require being able to overload
+ * the [] operator which is not possible in javascript.  So we leave
+ * them unimplemented.  Any attempt to call these methods will just result
+ * in a javascript error since we leave them undefined.
+ */
+
+
+/**
+ * If no existing Float64Array implementation is found then we export
+ * goog.vec.Float64Array as Float64Array.
+ */
+if (typeof Float64Array == 'undefined') {
+  try {
+    goog.exportProperty(goog.vec.Float64Array, 'BYTES_PER_ELEMENT',
+                        goog.vec.Float64Array.BYTES_PER_ELEMENT);
+  } catch (float64ArrayError) {
+    // Do nothing.  This code is in place to fix b/7225850, in which an error
+    // is incorrectly thrown for Google TV on an old Chrome.
+    // TODO(user): remove after that version is retired.
+  }
+
+  goog.exportProperty(goog.vec.Float64Array.prototype, 'BYTES_PER_ELEMENT',
+                      goog.vec.Float64Array.prototype.BYTES_PER_ELEMENT);
+  goog.exportProperty(goog.vec.Float64Array.prototype, 'set',
+                      goog.vec.Float64Array.prototype.set);
+  goog.exportProperty(goog.vec.Float64Array.prototype, 'toString',
+                      goog.vec.Float64Array.prototype.toString);
+  goog.exportSymbol('Float64Array', goog.vec.Float64Array);
+}
+
+// Copyright 2011 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+/**
+ * @fileoverview Supplies global data types and constants for the vector math
+ *     library.
+ */
+goog.provide('goog.vec');
+goog.provide('goog.vec.AnyType');
+goog.provide('goog.vec.ArrayType');
+goog.provide('goog.vec.Float32');
+goog.provide('goog.vec.Float64');
+goog.provide('goog.vec.Number');
+
+
+/**
+ * On platforms that don't have native Float32Array or Float64Array support we
+ * use a javascript implementation so that this math library can be used on all
+ * platforms.
+ * @suppress {extraRequire}
+ */
+goog.require('goog.vec.Float32Array');
+/** @suppress {extraRequire} */
+goog.require('goog.vec.Float64Array');
+
+// All vector and matrix operations are based upon arrays of numbers using
+// either Float32Array, Float64Array, or a standard Javascript Array of
+// Numbers.
+
+
+/** @typedef {!Float32Array} */
+goog.vec.Float32;
+
+
+/** @typedef {!Float64Array} */
+goog.vec.Float64;
+
+
+/** @typedef {!Array<number>} */
+goog.vec.Number;
+
+
+/** @typedef {!goog.vec.Float32|!goog.vec.Float64|!goog.vec.Number} */
+goog.vec.AnyType;
+
+
+/**
+ * @deprecated Use AnyType.
+ * @typedef {!Float32Array|!Array<number>}
+ */
+goog.vec.ArrayType;
+
+
+/**
+ * For graphics work, 6 decimal places of accuracy are typically all that is
+ * required.
+ *
+ * @type {number}
+ * @const
+ */
+goog.vec.EPSILON = 1e-6;
+
+// Copyright 2011 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+/**
+ * @fileoverview Supplies 3 element vectors that are compatible with WebGL.
+ * Each element is a float32 since that is typically the desired size of a
+ * 3-vector in the GPU.  The API is structured to avoid unnecessary memory
+ * allocations.  The last parameter will typically be the output vector and
+ * an object can be both an input and output parameter to all methods except
+ * where noted.
+ *
+ */
+goog.provide('goog.vec.Vec3');
+
+/** @suppress {extraRequire} */
+goog.require('goog.vec');
+
+/** @typedef {goog.vec.Float32} */ goog.vec.Vec3.Float32;
+/** @typedef {goog.vec.Float64} */ goog.vec.Vec3.Float64;
+/** @typedef {goog.vec.Number} */ goog.vec.Vec3.Number;
+/** @typedef {goog.vec.AnyType} */ goog.vec.Vec3.AnyType;
+
+// The following two types are deprecated - use the above types instead.
+/** @typedef {Float32Array} */ goog.vec.Vec3.Type;
+/** @typedef {goog.vec.ArrayType} */ goog.vec.Vec3.Vec3Like;
+
+
+/**
+ * Creates a 3 element vector of Float32. The array is initialized to zero.
+ *
+ * @return {!goog.vec.Vec3.Float32} The new 3 element array.
+ */
+goog.vec.Vec3.createFloat32 = function() {
+  return new Float32Array(3);
+};
+
+
+/**
+ * Creates a 3 element vector of Float64. The array is initialized to zero.
+ *
+ * @return {!goog.vec.Vec3.Float64} The new 3 element array.
+ */
+goog.vec.Vec3.createFloat64 = function() {
+  return new Float64Array(3);
+};
+
+
+/**
+ * Creates a 3 element vector of Number. The array is initialized to zero.
+ *
+ * @return {!goog.vec.Vec3.Number} The new 3 element array.
+ */
+goog.vec.Vec3.createNumber = function() {
+  var a = new Array(3);
+  goog.vec.Vec3.setFromValues(a, 0, 0, 0);
+  return a;
+};
+
+
+/**
+ * Creates a 3 element vector of Float32Array. The array is initialized to zero.
+ *
+ * @deprecated Use createFloat32.
+ * @return {!goog.vec.Vec3.Type} The new 3 element array.
+ */
+goog.vec.Vec3.create = function() {
+  return new Float32Array(3);
+};
+
+
+/**
+ * Creates a new 3 element FLoat32 vector initialized with the value from the
+ * given array.
+ *
+ * @param {goog.vec.Vec3.AnyType} vec The source 3 element array.
+ * @return {!goog.vec.Vec3.Float32} The new 3 element array.
+ */
+goog.vec.Vec3.createFloat32FromArray = function(vec) {
+  var newVec = goog.vec.Vec3.createFloat32();
+  goog.vec.Vec3.setFromArray(newVec, vec);
+  return newVec;
+};
+
+
+/**
+ * Creates a new 3 element Float32 vector initialized with the supplied values.
+ *
+ * @param {number} v0 The value for element at index 0.
+ * @param {number} v1 The value for element at index 1.
+ * @param {number} v2 The value for element at index 2.
+ * @return {!goog.vec.Vec3.Float32} The new vector.
+ */
+goog.vec.Vec3.createFloat32FromValues = function(v0, v1, v2) {
+  var a = goog.vec.Vec3.createFloat32();
+  goog.vec.Vec3.setFromValues(a, v0, v1, v2);
+  return a;
+};
+
+
+/**
+ * Creates a clone of the given 3 element Float32 vector.
+ *
+ * @param {goog.vec.Vec3.Float32} vec The source 3 element vector.
+ * @return {!goog.vec.Vec3.Float32} The new cloned vector.
+ */
+goog.vec.Vec3.cloneFloat32 = goog.vec.Vec3.createFloat32FromArray;
+
+
+/**
+ * Creates a new 3 element Float64 vector initialized with the value from the
+ * given array.
+ *
+ * @param {goog.vec.Vec3.AnyType} vec The source 3 element array.
+ * @return {!goog.vec.Vec3.Float64} The new 3 element array.
+ */
+goog.vec.Vec3.createFloat64FromArray = function(vec) {
+  var newVec = goog.vec.Vec3.createFloat64();
+  goog.vec.Vec3.setFromArray(newVec, vec);
+  return newVec;
+};
+
+
+/**
+* Creates a new 3 element Float64 vector initialized with the supplied values.
+*
+* @param {number} v0 The value for element at index 0.
+* @param {number} v1 The value for element at index 1.
+* @param {number} v2 The value for element at index 2.
+* @return {!goog.vec.Vec3.Float64} The new vector.
+*/
+goog.vec.Vec3.createFloat64FromValues = function(v0, v1, v2) {
+  var vec = goog.vec.Vec3.createFloat64();
+  goog.vec.Vec3.setFromValues(vec, v0, v1, v2);
+  return vec;
+};
+
+
+/**
+ * Creates a clone of the given 3 element vector.
+ *
+ * @param {goog.vec.Vec3.Float64} vec The source 3 element vector.
+ * @return {!goog.vec.Vec3.Float64} The new cloned vector.
+ */
+goog.vec.Vec3.cloneFloat64 = goog.vec.Vec3.createFloat64FromArray;
+
+
+/**
+ * Creates a new 3 element vector initialized with the value from the given
+ * array.
+ *
+ * @deprecated Use createFloat32FromArray.
+ * @param {goog.vec.Vec3.Vec3Like} vec The source 3 element array.
+ * @return {!goog.vec.Vec3.Type} The new 3 element array.
+ */
+goog.vec.Vec3.createFromArray = function(vec) {
+  var newVec = goog.vec.Vec3.create();
+  goog.vec.Vec3.setFromArray(newVec, vec);
+  return newVec;
+};
+
+
+/**
+ * Creates a new 3 element vector initialized with the supplied values.
+ *
+ * @deprecated Use createFloat32FromValues.
+ * @param {number} v0 The value for element at index 0.
+ * @param {number} v1 The value for element at index 1.
+ * @param {number} v2 The value for element at index 2.
+ * @return {!goog.vec.Vec3.Type} The new vector.
+ */
+goog.vec.Vec3.createFromValues = function(v0, v1, v2) {
+  var vec = goog.vec.Vec3.create();
+  goog.vec.Vec3.setFromValues(vec, v0, v1, v2);
+  return vec;
+};
+
+
+/**
+ * Creates a clone of the given 3 element vector.
+ *
+ * @deprecated Use cloneFloat32.
+ * @param {goog.vec.Vec3.Vec3Like} vec The source 3 element vector.
+ * @return {!goog.vec.Vec3.Type} The new cloned vector.
+ */
+goog.vec.Vec3.clone = function(vec) {
+  var newVec = goog.vec.Vec3.create();
+  goog.vec.Vec3.setFromArray(newVec, vec);
+  return newVec;
+};
+
+
+/**
+ * Initializes the vector with the given values.
+ *
+ * @param {goog.vec.Vec3.AnyType} vec The vector to receive the values.
+ * @param {number} v0 The value for element at index 0.
+ * @param {number} v1 The value for element at index 1.
+ * @param {number} v2 The value for element at index 2.
+ * @return {!goog.vec.Vec3.AnyType} Return vec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec3.setFromValues = function(vec, v0, v1, v2) {
+  vec[0] = v0;
+  vec[1] = v1;
+  vec[2] = v2;
+  return vec;
+};
+
+
+/**
+ * Initializes the vector with the given array of values.
+ *
+ * @param {goog.vec.Vec3.AnyType} vec The vector to receive the
+ *     values.
+ * @param {goog.vec.Vec3.AnyType} values The array of values.
+ * @return {!goog.vec.Vec3.AnyType} Return vec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec3.setFromArray = function(vec, values) {
+  vec[0] = values[0];
+  vec[1] = values[1];
+  vec[2] = values[2];
+  return vec;
+};
+
+
+/**
+ * Performs a component-wise addition of vec0 and vec1 together storing the
+ * result into resultVec.
+ *
+ * @param {goog.vec.Vec3.AnyType} vec0 The first addend.
+ * @param {goog.vec.Vec3.AnyType} vec1 The second addend.
+ * @param {goog.vec.Vec3.AnyType} resultVec The vector to
+ *     receive the result. May be vec0 or vec1.
+ * @return {!goog.vec.Vec3.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec3.add = function(vec0, vec1, resultVec) {
+  resultVec[0] = vec0[0] + vec1[0];
+  resultVec[1] = vec0[1] + vec1[1];
+  resultVec[2] = vec0[2] + vec1[2];
+  return resultVec;
+};
+
+
+/**
+ * Performs a component-wise subtraction of vec1 from vec0 storing the
+ * result into resultVec.
+ *
+ * @param {goog.vec.Vec3.AnyType} vec0 The minuend.
+ * @param {goog.vec.Vec3.AnyType} vec1 The subtrahend.
+ * @param {goog.vec.Vec3.AnyType} resultVec The vector to
+ *     receive the result. May be vec0 or vec1.
+ * @return {!goog.vec.Vec3.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec3.subtract = function(vec0, vec1, resultVec) {
+  resultVec[0] = vec0[0] - vec1[0];
+  resultVec[1] = vec0[1] - vec1[1];
+  resultVec[2] = vec0[2] - vec1[2];
+  return resultVec;
+};
+
+
+/**
+ * Negates vec0, storing the result into resultVec.
+ *
+ * @param {goog.vec.Vec3.AnyType} vec0 The vector to negate.
+ * @param {goog.vec.Vec3.AnyType} resultVec The vector to
+ *     receive the result. May be vec0.
+ * @return {!goog.vec.Vec3.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec3.negate = function(vec0, resultVec) {
+  resultVec[0] = -vec0[0];
+  resultVec[1] = -vec0[1];
+  resultVec[2] = -vec0[2];
+  return resultVec;
+};
+
+
+/**
+ * Takes the absolute value of each component of vec0 storing the result in
+ * resultVec.
+ *
+ * @param {goog.vec.Vec3.AnyType} vec0 The source vector.
+ * @param {goog.vec.Vec3.AnyType} resultVec The vector to receive the result.
+ *     May be vec0.
+ * @return {!goog.vec.Vec3.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec3.abs = function(vec0, resultVec) {
+  resultVec[0] = Math.abs(vec0[0]);
+  resultVec[1] = Math.abs(vec0[1]);
+  resultVec[2] = Math.abs(vec0[2]);
+  return resultVec;
+};
+
+
+/**
+ * Multiplies each component of vec0 with scalar storing the product into
+ * resultVec.
+ *
+ * @param {goog.vec.Vec3.AnyType} vec0 The source vector.
+ * @param {number} scalar The value to multiply with each component of vec0.
+ * @param {goog.vec.Vec3.AnyType} resultVec The vector to
+ *     receive the result. May be vec0.
+ * @return {!goog.vec.Vec3.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec3.scale = function(vec0, scalar, resultVec) {
+  resultVec[0] = vec0[0] * scalar;
+  resultVec[1] = vec0[1] * scalar;
+  resultVec[2] = vec0[2] * scalar;
+  return resultVec;
+};
+
+
+/**
+ * Returns the magnitudeSquared of the given vector.
+ *
+ * @param {goog.vec.Vec3.AnyType} vec0 The vector.
+ * @return {number} The magnitude of the vector.
+ */
+goog.vec.Vec3.magnitudeSquared = function(vec0) {
+  var x = vec0[0], y = vec0[1], z = vec0[2];
+  return x * x + y * y + z * z;
+};
+
+
+/**
+ * Returns the magnitude of the given vector.
+ *
+ * @param {goog.vec.Vec3.AnyType} vec0 The vector.
+ * @return {number} The magnitude of the vector.
+ */
+goog.vec.Vec3.magnitude = function(vec0) {
+  var x = vec0[0], y = vec0[1], z = vec0[2];
+  return Math.sqrt(x * x + y * y + z * z);
+};
+
+
+/**
+ * Normalizes the given vector storing the result into resultVec.
+ *
+ * @param {goog.vec.Vec3.AnyType} vec0 The vector to normalize.
+ * @param {goog.vec.Vec3.AnyType} resultVec The vector to
+ *     receive the result. May be vec0.
+ * @return {!goog.vec.Vec3.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec3.normalize = function(vec0, resultVec) {
+  var ilen = 1 / goog.vec.Vec3.magnitude(vec0);
+  resultVec[0] = vec0[0] * ilen;
+  resultVec[1] = vec0[1] * ilen;
+  resultVec[2] = vec0[2] * ilen;
+  return resultVec;
+};
+
+
+/**
+ * Returns the scalar product of vectors v0 and v1.
+ *
+ * @param {goog.vec.Vec3.AnyType} v0 The first vector.
+ * @param {goog.vec.Vec3.AnyType} v1 The second vector.
+ * @return {number} The scalar product.
+ */
+goog.vec.Vec3.dot = function(v0, v1) {
+  return v0[0] * v1[0] + v0[1] * v1[1] + v0[2] * v1[2];
+};
+
+
+/**
+ * Computes the vector (cross) product of v0 and v1 storing the result into
+ * resultVec.
+ *
+ * @param {goog.vec.Vec3.AnyType} v0 The first vector.
+ * @param {goog.vec.Vec3.AnyType} v1 The second vector.
+ * @param {goog.vec.Vec3.AnyType} resultVec The vector to receive the
+ *     results. May be either v0 or v1.
+ * @return {!goog.vec.Vec3.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec3.cross = function(v0, v1, resultVec) {
+  var x0 = v0[0], y0 = v0[1], z0 = v0[2];
+  var x1 = v1[0], y1 = v1[1], z1 = v1[2];
+  resultVec[0] = y0 * z1 - z0 * y1;
+  resultVec[1] = z0 * x1 - x0 * z1;
+  resultVec[2] = x0 * y1 - y0 * x1;
+  return resultVec;
+};
+
+
+/**
+ * Returns the squared distance between two points.
+ *
+ * @param {goog.vec.Vec3.AnyType} vec0 First point.
+ * @param {goog.vec.Vec3.AnyType} vec1 Second point.
+ * @return {number} The squared distance between the points.
+ */
+goog.vec.Vec3.distanceSquared = function(vec0, vec1) {
+  var x = vec0[0] - vec1[0];
+  var y = vec0[1] - vec1[1];
+  var z = vec0[2] - vec1[2];
+  return x * x + y * y + z * z;
+};
+
+
+/**
+ * Returns the distance between two points.
+ *
+ * @param {goog.vec.Vec3.AnyType} vec0 First point.
+ * @param {goog.vec.Vec3.AnyType} vec1 Second point.
+ * @return {number} The distance between the points.
+ */
+goog.vec.Vec3.distance = function(vec0, vec1) {
+  return Math.sqrt(goog.vec.Vec3.distanceSquared(vec0, vec1));
+};
+
+
+/**
+ * Returns a unit vector pointing from one point to another.
+ * If the input points are equal then the result will be all zeros.
+ *
+ * @param {goog.vec.Vec3.AnyType} vec0 Origin point.
+ * @param {goog.vec.Vec3.AnyType} vec1 Target point.
+ * @param {goog.vec.Vec3.AnyType} resultVec The vector to receive the
+ *     results (may be vec0 or vec1).
+ * @return {!goog.vec.Vec3.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec3.direction = function(vec0, vec1, resultVec) {
+  var x = vec1[0] - vec0[0];
+  var y = vec1[1] - vec0[1];
+  var z = vec1[2] - vec0[2];
+  var d = Math.sqrt(x * x + y * y + z * z);
+  if (d) {
+    d = 1 / d;
+    resultVec[0] = x * d;
+    resultVec[1] = y * d;
+    resultVec[2] = z * d;
+  } else {
+    resultVec[0] = resultVec[1] = resultVec[2] = 0;
+  }
+  return resultVec;
+};
+
+
+/**
+ * Linearly interpolate from vec0 to v1 according to f. The value of f should be
+ * in the range [0..1] otherwise the results are undefined.
+ *
+ * @param {goog.vec.Vec3.AnyType} v0 The first vector.
+ * @param {goog.vec.Vec3.AnyType} v1 The second vector.
+ * @param {number} f The interpolation factor.
+ * @param {goog.vec.Vec3.AnyType} resultVec The vector to receive the
+ *     results (may be v0 or v1).
+ * @return {!goog.vec.Vec3.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec3.lerp = function(v0, v1, f, resultVec) {
+  var x = v0[0], y = v0[1], z = v0[2];
+  resultVec[0] = (v1[0] - x) * f + x;
+  resultVec[1] = (v1[1] - y) * f + y;
+  resultVec[2] = (v1[2] - z) * f + z;
+  return resultVec;
+};
+
+
+/**
+ * Compares the components of vec0 with the components of another vector or
+ * scalar, storing the larger values in resultVec.
+ *
+ * @param {goog.vec.Vec3.AnyType} vec0 The source vector.
+ * @param {goog.vec.Vec3.AnyType|number} limit The limit vector or scalar.
+ * @param {goog.vec.Vec3.AnyType} resultVec The vector to receive the
+ *     results (may be vec0 or limit).
+ * @return {!goog.vec.Vec3.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec3.max = function(vec0, limit, resultVec) {
+  if (goog.isNumber(limit)) {
+    resultVec[0] = Math.max(vec0[0], limit);
+    resultVec[1] = Math.max(vec0[1], limit);
+    resultVec[2] = Math.max(vec0[2], limit);
+  } else {
+    resultVec[0] = Math.max(vec0[0], limit[0]);
+    resultVec[1] = Math.max(vec0[1], limit[1]);
+    resultVec[2] = Math.max(vec0[2], limit[2]);
+  }
+  return resultVec;
+};
+
+
+/**
+ * Compares the components of vec0 with the components of another vector or
+ * scalar, storing the smaller values in resultVec.
+ *
+ * @param {goog.vec.Vec3.AnyType} vec0 The source vector.
+ * @param {goog.vec.Vec3.AnyType|number} limit The limit vector or scalar.
+ * @param {goog.vec.Vec3.AnyType} resultVec The vector to receive the
+ *     results (may be vec0 or limit).
+ * @return {!goog.vec.Vec3.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec3.min = function(vec0, limit, resultVec) {
+  if (goog.isNumber(limit)) {
+    resultVec[0] = Math.min(vec0[0], limit);
+    resultVec[1] = Math.min(vec0[1], limit);
+    resultVec[2] = Math.min(vec0[2], limit);
+  } else {
+    resultVec[0] = Math.min(vec0[0], limit[0]);
+    resultVec[1] = Math.min(vec0[1], limit[1]);
+    resultVec[2] = Math.min(vec0[2], limit[2]);
+  }
+  return resultVec;
+};
+
+
+/**
+ * Returns true if the components of v0 are equal to the components of v1.
+ *
+ * @param {goog.vec.Vec3.AnyType} v0 The first vector.
+ * @param {goog.vec.Vec3.AnyType} v1 The second vector.
+ * @return {boolean} True if the vectors are equal, false otherwise.
+ */
+goog.vec.Vec3.equals = function(v0, v1) {
+  return v0.length == v1.length &&
+      v0[0] == v1[0] && v0[1] == v1[1] && v0[2] == v1[2];
+};
+
+// Copyright 2011 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+/**
+ * @fileoverview Supplies 4 element vectors that are compatible with WebGL.
+ * Each element is a float32 since that is typically the desired size of a
+ * 4-vector in the GPU.  The API is structured to avoid unnecessary memory
+ * allocations.  The last parameter will typically be the output vector and
+ * an object can be both an input and output parameter to all methods except
+ * where noted.
+ *
+ */
+goog.provide('goog.vec.Vec4');
+
+/** @suppress {extraRequire} */
+goog.require('goog.vec');
+
+/** @typedef {goog.vec.Float32} */ goog.vec.Vec4.Float32;
+/** @typedef {goog.vec.Float64} */ goog.vec.Vec4.Float64;
+/** @typedef {goog.vec.Number} */ goog.vec.Vec4.Number;
+/** @typedef {goog.vec.AnyType} */ goog.vec.Vec4.AnyType;
+
+// The following two types are deprecated - use the above types instead.
+/** @typedef {Float32Array} */ goog.vec.Vec4.Type;
+/** @typedef {goog.vec.ArrayType} */ goog.vec.Vec4.Vec4Like;
+
+
+/**
+ * Creates a 4 element vector of Float32. The array is initialized to zero.
+ *
+ * @return {!goog.vec.Vec4.Float32} The new 3 element array.
+ */
+goog.vec.Vec4.createFloat32 = function() {
+  return new Float32Array(4);
+};
+
+
+/**
+ * Creates a 4 element vector of Float64. The array is initialized to zero.
+ *
+ * @return {!goog.vec.Vec4.Float64} The new 4 element array.
+ */
+goog.vec.Vec4.createFloat64 = function() {
+  return new Float64Array(4);
+};
+
+
+/**
+ * Creates a 4 element vector of Number. The array is initialized to zero.
+ *
+ * @return {!goog.vec.Vec4.Number} The new 4 element array.
+ */
+goog.vec.Vec4.createNumber = function() {
+  var v = new Array(4);
+  goog.vec.Vec4.setFromValues(v, 0, 0, 0, 0);
+  return v;
+};
+
+
+/**
+ * Creates a 4 element vector of Float32Array. The array is initialized to zero.
+ *
+ * @deprecated Use createFloat32.
+ * @return {!goog.vec.Vec4.Type} The new 4 element array.
+ */
+goog.vec.Vec4.create = function() {
+  return new Float32Array(4);
+};
+
+
+/**
+ * Creates a new 4 element vector initialized with the value from the given
+ * array.
+ *
+ * @deprecated Use createFloat32FromArray.
+ * @param {goog.vec.Vec4.Vec4Like} vec The source 4 element array.
+ * @return {!goog.vec.Vec4.Type} The new 4 element array.
+ */
+goog.vec.Vec4.createFromArray = function(vec) {
+  var newVec = goog.vec.Vec4.create();
+  goog.vec.Vec4.setFromArray(newVec, vec);
+  return newVec;
+};
+
+
+/**
+ * Creates a new 4 element FLoat32 vector initialized with the value from the
+ * given array.
+ *
+ * @param {goog.vec.Vec4.AnyType} vec The source 3 element array.
+ * @return {!goog.vec.Vec4.Float32} The new 3 element array.
+ */
+goog.vec.Vec4.createFloat32FromArray = function(vec) {
+  var newVec = goog.vec.Vec4.createFloat32();
+  goog.vec.Vec4.setFromArray(newVec, vec);
+  return newVec;
+};
+
+
+/**
+ * Creates a new 4 element Float32 vector initialized with the supplied values.
+ *
+ * @param {number} v0 The value for element at index 0.
+ * @param {number} v1 The value for element at index 1.
+ * @param {number} v2 The value for element at index 2.
+ * @param {number} v3 The value for element at index 3.
+ * @return {!goog.vec.Vec4.Float32} The new vector.
+ */
+goog.vec.Vec4.createFloat32FromValues = function(v0, v1, v2, v3) {
+  var vec = goog.vec.Vec4.createFloat32();
+  goog.vec.Vec4.setFromValues(vec, v0, v1, v2, v3);
+  return vec;
+};
+
+
+/**
+ * Creates a clone of the given 4 element Float32 vector.
+ *
+ * @param {goog.vec.Vec4.Float32} vec The source 3 element vector.
+ * @return {!goog.vec.Vec4.Float32} The new cloned vector.
+ */
+goog.vec.Vec4.cloneFloat32 = goog.vec.Vec4.createFloat32FromArray;
+
+
+/**
+ * Creates a new 4 element Float64 vector initialized with the value from the
+ * given array.
+ *
+ * @param {goog.vec.Vec4.AnyType} vec The source 4 element array.
+ * @return {!goog.vec.Vec4.Float64} The new 4 element array.
+ */
+goog.vec.Vec4.createFloat64FromArray = function(vec) {
+  var newVec = goog.vec.Vec4.createFloat64();
+  goog.vec.Vec4.setFromArray(newVec, vec);
+  return newVec;
+};
+
+
+/**
+* Creates a new 4 element Float64 vector initialized with the supplied values.
+*
+* @param {number} v0 The value for element at index 0.
+* @param {number} v1 The value for element at index 1.
+* @param {number} v2 The value for element at index 2.
+* @param {number} v3 The value for element at index 3.
+* @return {!goog.vec.Vec4.Float64} The new vector.
+*/
+goog.vec.Vec4.createFloat64FromValues = function(v0, v1, v2, v3) {
+  var vec = goog.vec.Vec4.createFloat64();
+  goog.vec.Vec4.setFromValues(vec, v0, v1, v2, v3);
+  return vec;
+};
+
+
+/**
+ * Creates a clone of the given 4 element vector.
+ *
+ * @param {goog.vec.Vec4.Float64} vec The source 4 element vector.
+ * @return {!goog.vec.Vec4.Float64} The new cloned vector.
+ */
+goog.vec.Vec4.cloneFloat64 = goog.vec.Vec4.createFloat64FromArray;
+
+
+/**
+ * Creates a new 4 element vector initialized with the supplied values.
+ *
+ * @deprecated Use createFloat32FromValues.
+ * @param {number} v0 The value for element at index 0.
+ * @param {number} v1 The value for element at index 1.
+ * @param {number} v2 The value for element at index 2.
+ * @param {number} v3 The value for element at index 3.
+ * @return {!goog.vec.Vec4.Type} The new vector.
+ */
+goog.vec.Vec4.createFromValues = function(v0, v1, v2, v3) {
+  var vec = goog.vec.Vec4.create();
+  goog.vec.Vec4.setFromValues(vec, v0, v1, v2, v3);
+  return vec;
+};
+
+
+/**
+ * Creates a clone of the given 4 element vector.
+ *
+ * @deprecated Use cloneFloat32.
+ * @param {goog.vec.Vec4.Vec4Like} vec The source 4 element vector.
+ * @return {!goog.vec.Vec4.Type} The new cloned vector.
+ */
+goog.vec.Vec4.clone = goog.vec.Vec4.createFromArray;
+
+
+/**
+ * Initializes the vector with the given values.
+ *
+ * @param {goog.vec.Vec4.AnyType} vec The vector to receive the values.
+ * @param {number} v0 The value for element at index 0.
+ * @param {number} v1 The value for element at index 1.
+ * @param {number} v2 The value for element at index 2.
+ * @param {number} v3 The value for element at index 3.
+ * @return {!goog.vec.Vec4.AnyType} Return vec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec4.setFromValues = function(vec, v0, v1, v2, v3) {
+  vec[0] = v0;
+  vec[1] = v1;
+  vec[2] = v2;
+  vec[3] = v3;
+  return vec;
+};
+
+
+/**
+ * Initializes the vector with the given array of values.
+ *
+ * @param {goog.vec.Vec4.AnyType} vec The vector to receive the
+ *     values.
+ * @param {goog.vec.Vec4.AnyType} values The array of values.
+ * @return {!goog.vec.Vec4.AnyType} Return vec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec4.setFromArray = function(vec, values) {
+  vec[0] = values[0];
+  vec[1] = values[1];
+  vec[2] = values[2];
+  vec[3] = values[3];
+  return vec;
+};
+
+
+/**
+ * Performs a component-wise addition of vec0 and vec1 together storing the
+ * result into resultVec.
+ *
+ * @param {goog.vec.Vec4.AnyType} vec0 The first addend.
+ * @param {goog.vec.Vec4.AnyType} vec1 The second addend.
+ * @param {goog.vec.Vec4.AnyType} resultVec The vector to
+ *     receive the result. May be vec0 or vec1.
+ * @return {!goog.vec.Vec4.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec4.add = function(vec0, vec1, resultVec) {
+  resultVec[0] = vec0[0] + vec1[0];
+  resultVec[1] = vec0[1] + vec1[1];
+  resultVec[2] = vec0[2] + vec1[2];
+  resultVec[3] = vec0[3] + vec1[3];
+  return resultVec;
+};
+
+
+/**
+ * Performs a component-wise subtraction of vec1 from vec0 storing the
+ * result into resultVec.
+ *
+ * @param {goog.vec.Vec4.AnyType} vec0 The minuend.
+ * @param {goog.vec.Vec4.AnyType} vec1 The subtrahend.
+ * @param {goog.vec.Vec4.AnyType} resultVec The vector to
+ *     receive the result. May be vec0 or vec1.
+ * @return {!goog.vec.Vec4.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec4.subtract = function(vec0, vec1, resultVec) {
+  resultVec[0] = vec0[0] - vec1[0];
+  resultVec[1] = vec0[1] - vec1[1];
+  resultVec[2] = vec0[2] - vec1[2];
+  resultVec[3] = vec0[3] - vec1[3];
+  return resultVec;
+};
+
+
+/**
+ * Negates vec0, storing the result into resultVec.
+ *
+ * @param {goog.vec.Vec4.AnyType} vec0 The vector to negate.
+ * @param {goog.vec.Vec4.AnyType} resultVec The vector to
+ *     receive the result. May be vec0.
+ * @return {!goog.vec.Vec4.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec4.negate = function(vec0, resultVec) {
+  resultVec[0] = -vec0[0];
+  resultVec[1] = -vec0[1];
+  resultVec[2] = -vec0[2];
+  resultVec[3] = -vec0[3];
+  return resultVec;
+};
+
+
+/**
+ * Takes the absolute value of each component of vec0 storing the result in
+ * resultVec.
+ *
+ * @param {goog.vec.Vec4.AnyType} vec0 The source vector.
+ * @param {goog.vec.Vec4.AnyType} resultVec The vector to receive the result.
+ *     May be vec0.
+ * @return {!goog.vec.Vec4.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec4.abs = function(vec0, resultVec) {
+  resultVec[0] = Math.abs(vec0[0]);
+  resultVec[1] = Math.abs(vec0[1]);
+  resultVec[2] = Math.abs(vec0[2]);
+  resultVec[3] = Math.abs(vec0[3]);
+  return resultVec;
+};
+
+
+/**
+ * Multiplies each component of vec0 with scalar storing the product into
+ * resultVec.
+ *
+ * @param {goog.vec.Vec4.AnyType} vec0 The source vector.
+ * @param {number} scalar The value to multiply with each component of vec0.
+ * @param {goog.vec.Vec4.AnyType} resultVec The vector to
+ *     receive the result. May be vec0.
+ * @return {!goog.vec.Vec4.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec4.scale = function(vec0, scalar, resultVec) {
+  resultVec[0] = vec0[0] * scalar;
+  resultVec[1] = vec0[1] * scalar;
+  resultVec[2] = vec0[2] * scalar;
+  resultVec[3] = vec0[3] * scalar;
+  return resultVec;
+};
+
+
+/**
+ * Returns the magnitudeSquared of the given vector.
+ *
+ * @param {goog.vec.Vec4.AnyType} vec0 The vector.
+ * @return {number} The magnitude of the vector.
+ */
+goog.vec.Vec4.magnitudeSquared = function(vec0) {
+  var x = vec0[0], y = vec0[1], z = vec0[2], w = vec0[3];
+  return x * x + y * y + z * z + w * w;
+};
+
+
+/**
+ * Returns the magnitude of the given vector.
+ *
+ * @param {goog.vec.Vec4.AnyType} vec0 The vector.
+ * @return {number} The magnitude of the vector.
+ */
+goog.vec.Vec4.magnitude = function(vec0) {
+  var x = vec0[0], y = vec0[1], z = vec0[2], w = vec0[3];
+  return Math.sqrt(x * x + y * y + z * z + w * w);
+};
+
+
+/**
+ * Normalizes the given vector storing the result into resultVec.
+ *
+ * @param {goog.vec.Vec4.AnyType} vec0 The vector to normalize.
+ * @param {goog.vec.Vec4.AnyType} resultVec The vector to
+ *     receive the result. May be vec0.
+ * @return {!goog.vec.Vec4.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec4.normalize = function(vec0, resultVec) {
+  var ilen = 1 / goog.vec.Vec4.magnitude(vec0);
+  resultVec[0] = vec0[0] * ilen;
+  resultVec[1] = vec0[1] * ilen;
+  resultVec[2] = vec0[2] * ilen;
+  resultVec[3] = vec0[3] * ilen;
+  return resultVec;
+};
+
+
+/**
+ * Returns the scalar product of vectors v0 and v1.
+ *
+ * @param {goog.vec.Vec4.AnyType} v0 The first vector.
+ * @param {goog.vec.Vec4.AnyType} v1 The second vector.
+ * @return {number} The scalar product.
+ */
+goog.vec.Vec4.dot = function(v0, v1) {
+  return v0[0] * v1[0] + v0[1] * v1[1] + v0[2] * v1[2] + v0[3] * v1[3];
+};
+
+
+/**
+ * Linearly interpolate from v0 to v1 according to f. The value of f should be
+ * in the range [0..1] otherwise the results are undefined.
+ *
+ * @param {goog.vec.Vec4.AnyType} v0 The first vector.
+ * @param {goog.vec.Vec4.AnyType} v1 The second vector.
+ * @param {number} f The interpolation factor.
+ * @param {goog.vec.Vec4.AnyType} resultVec The vector to receive the
+ *     results (may be v0 or v1).
+ * @return {!goog.vec.Vec4.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec4.lerp = function(v0, v1, f, resultVec) {
+  var x = v0[0], y = v0[1], z = v0[2], w = v0[3];
+  resultVec[0] = (v1[0] - x) * f + x;
+  resultVec[1] = (v1[1] - y) * f + y;
+  resultVec[2] = (v1[2] - z) * f + z;
+  resultVec[3] = (v1[3] - w) * f + w;
+  return resultVec;
+};
+
+
+/**
+ * Compares the components of vec0 with the components of another vector or
+ * scalar, storing the larger values in resultVec.
+ *
+ * @param {goog.vec.Vec4.AnyType} vec0 The source vector.
+ * @param {goog.vec.Vec4.AnyType|number} limit The limit vector or scalar.
+ * @param {goog.vec.Vec4.AnyType} resultVec The vector to receive the
+ *     results (may be vec0 or limit).
+ * @return {!goog.vec.Vec4.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec4.max = function(vec0, limit, resultVec) {
+  if (goog.isNumber(limit)) {
+    resultVec[0] = Math.max(vec0[0], limit);
+    resultVec[1] = Math.max(vec0[1], limit);
+    resultVec[2] = Math.max(vec0[2], limit);
+    resultVec[3] = Math.max(vec0[3], limit);
+  } else {
+    resultVec[0] = Math.max(vec0[0], limit[0]);
+    resultVec[1] = Math.max(vec0[1], limit[1]);
+    resultVec[2] = Math.max(vec0[2], limit[2]);
+    resultVec[3] = Math.max(vec0[3], limit[3]);
+  }
+  return resultVec;
+};
+
+
+/**
+ * Compares the components of vec0 with the components of another vector or
+ * scalar, storing the smaller values in resultVec.
+ *
+ * @param {goog.vec.Vec4.AnyType} vec0 The source vector.
+ * @param {goog.vec.Vec4.AnyType|number} limit The limit vector or scalar.
+ * @param {goog.vec.Vec4.AnyType} resultVec The vector to receive the
+ *     results (may be vec0 or limit).
+ * @return {!goog.vec.Vec4.AnyType} Return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Vec4.min = function(vec0, limit, resultVec) {
+  if (goog.isNumber(limit)) {
+    resultVec[0] = Math.min(vec0[0], limit);
+    resultVec[1] = Math.min(vec0[1], limit);
+    resultVec[2] = Math.min(vec0[2], limit);
+    resultVec[3] = Math.min(vec0[3], limit);
+  } else {
+    resultVec[0] = Math.min(vec0[0], limit[0]);
+    resultVec[1] = Math.min(vec0[1], limit[1]);
+    resultVec[2] = Math.min(vec0[2], limit[2]);
+    resultVec[3] = Math.min(vec0[3], limit[3]);
+  }
+  return resultVec;
+};
+
+
+/**
+ * Returns true if the components of v0 are equal to the components of v1.
+ *
+ * @param {goog.vec.Vec4.AnyType} v0 The first vector.
+ * @param {goog.vec.Vec4.AnyType} v1 The second vector.
+ * @return {boolean} True if the vectors are equal, false otherwise.
+ */
+goog.vec.Vec4.equals = function(v0, v1) {
+  return v0.length == v1.length &&
+      v0[0] == v1[0] && v0[1] == v1[1] && v0[2] == v1[2] && v0[3] == v1[3];
+};
+
+// Copyright 2011 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Implements 4x4 matrices and their related functions which are
+ * compatible with WebGL. The API is structured to avoid unnecessary memory
+ * allocations.  The last parameter will typically be the output vector and
+ * an object can be both an input and output parameter to all methods except
+ * where noted. Matrix operations follow the mathematical form when multiplying
+ * vectors as follows: resultVec = matrix * vec.
+ *
+ * The matrices are stored in column-major order.
+ *
+ */
+goog.provide('goog.vec.Mat4');
+
+goog.require('goog.vec');
+goog.require('goog.vec.Vec3');
+goog.require('goog.vec.Vec4');
+
+
+/** @typedef {goog.vec.Float32} */ goog.vec.Mat4.Float32;
+/** @typedef {goog.vec.Float64} */ goog.vec.Mat4.Float64;
+/** @typedef {goog.vec.Number} */ goog.vec.Mat4.Number;
+/** @typedef {goog.vec.AnyType} */ goog.vec.Mat4.AnyType;
+
+// The following two types are deprecated - use the above types instead.
+/** @typedef {!Float32Array} */ goog.vec.Mat4.Type;
+/** @typedef {goog.vec.ArrayType} */ goog.vec.Mat4.Mat4Like;
+
+
+/**
+ * Creates the array representation of a 4x4 matrix of Float32.
+ * The use of the array directly instead of a class reduces overhead.
+ * The returned matrix is cleared to all zeros.
+ *
+ * @return {!goog.vec.Mat4.Float32} The new matrix.
+ */
+goog.vec.Mat4.createFloat32 = function() {
+  return new Float32Array(16);
+};
+
+
+/**
+ * Creates the array representation of a 4x4 matrix of Float64.
+ * The returned matrix is cleared to all zeros.
+ *
+ * @return {!goog.vec.Mat4.Float64} The new matrix.
+ */
+goog.vec.Mat4.createFloat64 = function() {
+  return new Float64Array(16);
+};
+
+
+/**
+ * Creates the array representation of a 4x4 matrix of Number.
+ * The returned matrix is cleared to all zeros.
+ *
+ * @return {!goog.vec.Mat4.Number} The new matrix.
+ */
+goog.vec.Mat4.createNumber = function() {
+  var a = new Array(16);
+  goog.vec.Mat4.setFromValues(a,
+                              0, 0, 0, 0,
+                              0, 0, 0, 0,
+                              0, 0, 0, 0,
+                              0, 0, 0, 0);
+  return a;
+};
+
+
+/**
+ * Creates the array representation of a 4x4 matrix of Float32.
+ * The returned matrix is cleared to all zeros.
+ *
+ * @deprecated Use createFloat32.
+ * @return {!goog.vec.Mat4.Type} The new matrix.
+ */
+goog.vec.Mat4.create = function() {
+  return goog.vec.Mat4.createFloat32();
+};
+
+
+/**
+ * Creates a 4x4 identity matrix of Float32.
+ *
+ * @return {!goog.vec.Mat4.Float32} The new 16 element array.
+ */
+goog.vec.Mat4.createFloat32Identity = function() {
+  var mat = goog.vec.Mat4.createFloat32();
+  mat[0] = mat[5] = mat[10] = mat[15] = 1;
+  return mat;
+};
+
+
+/**
+ * Creates a 4x4 identity matrix of Float64.
+ *
+ * @return {!goog.vec.Mat4.Float64} The new 16 element array.
+ */
+goog.vec.Mat4.createFloat64Identity = function() {
+  var mat = goog.vec.Mat4.createFloat64();
+  mat[0] = mat[5] = mat[10] = mat[15] = 1;
+  return mat;
+};
+
+
+/**
+ * Creates a 4x4 identity matrix of Number.
+ * The returned matrix is cleared to all zeros.
+ *
+ * @return {!goog.vec.Mat4.Number} The new 16 element array.
+ */
+goog.vec.Mat4.createNumberIdentity = function() {
+  var a = new Array(16);
+  goog.vec.Mat4.setFromValues(a,
+                              1, 0, 0, 0,
+                              0, 1, 0, 0,
+                              0, 0, 1, 0,
+                              0, 0, 0, 1);
+  return a;
+};
+
+
+/**
+ * Creates the array representation of a 4x4 matrix of Float32.
+ * The returned matrix is cleared to all zeros.
+ *
+ * @deprecated Use createFloat32Identity.
+ * @return {!goog.vec.Mat4.Type} The new 16 element array.
+ */
+goog.vec.Mat4.createIdentity = function() {
+  return goog.vec.Mat4.createFloat32Identity();
+};
+
+
+/**
+ * Creates a 4x4 matrix of Float32 initialized from the given array.
+ *
+ * @param {goog.vec.Mat4.AnyType} matrix The array containing the
+ *     matrix values in column major order.
+ * @return {!goog.vec.Mat4.Float32} The new, 16 element array.
+ */
+goog.vec.Mat4.createFloat32FromArray = function(matrix) {
+  var newMatrix = goog.vec.Mat4.createFloat32();
+  goog.vec.Mat4.setFromArray(newMatrix, matrix);
+  return newMatrix;
+};
+
+
+/**
+ * Creates a 4x4 matrix of Float32 initialized from the given values.
+ *
+ * @param {number} v00 The values at (0, 0).
+ * @param {number} v10 The values at (1, 0).
+ * @param {number} v20 The values at (2, 0).
+ * @param {number} v30 The values at (3, 0).
+ * @param {number} v01 The values at (0, 1).
+ * @param {number} v11 The values at (1, 1).
+ * @param {number} v21 The values at (2, 1).
+ * @param {number} v31 The values at (3, 1).
+ * @param {number} v02 The values at (0, 2).
+ * @param {number} v12 The values at (1, 2).
+ * @param {number} v22 The values at (2, 2).
+ * @param {number} v32 The values at (3, 2).
+ * @param {number} v03 The values at (0, 3).
+ * @param {number} v13 The values at (1, 3).
+ * @param {number} v23 The values at (2, 3).
+ * @param {number} v33 The values at (3, 3).
+ * @return {!goog.vec.Mat4.Float32} The new, 16 element array.
+ */
+goog.vec.Mat4.createFloat32FromValues = function(
+    v00, v10, v20, v30,
+    v01, v11, v21, v31,
+    v02, v12, v22, v32,
+    v03, v13, v23, v33) {
+  var newMatrix = goog.vec.Mat4.createFloat32();
+  goog.vec.Mat4.setFromValues(
+      newMatrix, v00, v10, v20, v30, v01, v11, v21, v31, v02, v12, v22, v32,
+      v03, v13, v23, v33);
+  return newMatrix;
+};
+
+
+/**
+ * Creates a clone of a 4x4 matrix of Float32.
+ *
+ * @param {goog.vec.Mat4.Float32} matrix The source 4x4 matrix.
+ * @return {!goog.vec.Mat4.Float32} The new 4x4 element matrix.
+ */
+goog.vec.Mat4.cloneFloat32 = goog.vec.Mat4.createFloat32FromArray;
+
+
+/**
+ * Creates a 4x4 matrix of Float64 initialized from the given array.
+ *
+ * @param {goog.vec.Mat4.AnyType} matrix The array containing the
+ *     matrix values in column major order.
+ * @return {!goog.vec.Mat4.Float64} The new, nine element array.
+ */
+goog.vec.Mat4.createFloat64FromArray = function(matrix) {
+  var newMatrix = goog.vec.Mat4.createFloat64();
+  goog.vec.Mat4.setFromArray(newMatrix, matrix);
+  return newMatrix;
+};
+
+
+/**
+ * Creates a 4x4 matrix of Float64 initialized from the given values.
+ *
+ * @param {number} v00 The values at (0, 0).
+ * @param {number} v10 The values at (1, 0).
+ * @param {number} v20 The values at (2, 0).
+ * @param {number} v30 The values at (3, 0).
+ * @param {number} v01 The values at (0, 1).
+ * @param {number} v11 The values at (1, 1).
+ * @param {number} v21 The values at (2, 1).
+ * @param {number} v31 The values at (3, 1).
+ * @param {number} v02 The values at (0, 2).
+ * @param {number} v12 The values at (1, 2).
+ * @param {number} v22 The values at (2, 2).
+ * @param {number} v32 The values at (3, 2).
+ * @param {number} v03 The values at (0, 3).
+ * @param {number} v13 The values at (1, 3).
+ * @param {number} v23 The values at (2, 3).
+ * @param {number} v33 The values at (3, 3).
+ * @return {!goog.vec.Mat4.Float64} The new, 16 element array.
+ */
+goog.vec.Mat4.createFloat64FromValues = function(
+    v00, v10, v20, v30,
+    v01, v11, v21, v31,
+    v02, v12, v22, v32,
+    v03, v13, v23, v33) {
+  var newMatrix = goog.vec.Mat4.createFloat64();
+  goog.vec.Mat4.setFromValues(
+      newMatrix, v00, v10, v20, v30, v01, v11, v21, v31, v02, v12, v22, v32,
+      v03, v13, v23, v33);
+  return newMatrix;
+};
+
+
+/**
+ * Creates a clone of a 4x4 matrix of Float64.
+ *
+ * @param {goog.vec.Mat4.Float64} matrix The source 4x4 matrix.
+ * @return {!goog.vec.Mat4.Float64} The new 4x4 element matrix.
+ */
+goog.vec.Mat4.cloneFloat64 = goog.vec.Mat4.createFloat64FromArray;
+
+
+/**
+ * Creates a 4x4 matrix of Float32 initialized from the given array.
+ *
+ * @deprecated Use createFloat32FromArray.
+ * @param {goog.vec.Mat4.Mat4Like} matrix The array containing the
+ *     matrix values in column major order.
+ * @return {!goog.vec.Mat4.Type} The new, nine element array.
+ */
+goog.vec.Mat4.createFromArray = function(matrix) {
+  var newMatrix = goog.vec.Mat4.createFloat32();
+  goog.vec.Mat4.setFromArray(newMatrix, matrix);
+  return newMatrix;
+};
+
+
+/**
+ * Creates a 4x4 matrix of Float32 initialized from the given values.
+ *
+ * @deprecated Use createFloat32FromValues.
+ * @param {number} v00 The values at (0, 0).
+ * @param {number} v10 The values at (1, 0).
+ * @param {number} v20 The values at (2, 0).
+ * @param {number} v30 The values at (3, 0).
+ * @param {number} v01 The values at (0, 1).
+ * @param {number} v11 The values at (1, 1).
+ * @param {number} v21 The values at (2, 1).
+ * @param {number} v31 The values at (3, 1).
+ * @param {number} v02 The values at (0, 2).
+ * @param {number} v12 The values at (1, 2).
+ * @param {number} v22 The values at (2, 2).
+ * @param {number} v32 The values at (3, 2).
+ * @param {number} v03 The values at (0, 3).
+ * @param {number} v13 The values at (1, 3).
+ * @param {number} v23 The values at (2, 3).
+ * @param {number} v33 The values at (3, 3).
+ * @return {!goog.vec.Mat4.Type} The new, 16 element array.
+ */
+goog.vec.Mat4.createFromValues = function(
+    v00, v10, v20, v30,
+    v01, v11, v21, v31,
+    v02, v12, v22, v32,
+    v03, v13, v23, v33) {
+  return goog.vec.Mat4.createFloat32FromValues(
+      v00, v10, v20, v30, v01, v11, v21, v31, v02, v12, v22, v32,
+      v03, v13, v23, v33);
+};
+
+
+/**
+ * Creates a clone of a 4x4 matrix of Float32.
+ *
+ * @deprecated Use cloneFloat32.
+ * @param {goog.vec.Mat4.Mat4Like} matrix The source 4x4 matrix.
+ * @return {!goog.vec.Mat4.Type} The new 4x4 element matrix.
+ */
+goog.vec.Mat4.clone = goog.vec.Mat4.createFromArray;
+
+
+/**
+ * Retrieves the element at the requested row and column.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix containing the
+ *     value to retrieve.
+ * @param {number} row The row index.
+ * @param {number} column The column index.
+ * @return {number} The element value at the requested row, column indices.
+ */
+goog.vec.Mat4.getElement = function(mat, row, column) {
+  return mat[row + column * 4];
+};
+
+
+/**
+ * Sets the element at the requested row and column.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix to set the value on.
+ * @param {number} row The row index.
+ * @param {number} column The column index.
+ * @param {number} value The value to set at the requested row, column.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.setElement = function(mat, row, column, value) {
+  mat[row + column * 4] = value;
+  return mat;
+};
+
+
+/**
+ * Initializes the matrix from the set of values. Note the values supplied are
+ * in column major order.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix to receive the
+ *     values.
+ * @param {number} v00 The values at (0, 0).
+ * @param {number} v10 The values at (1, 0).
+ * @param {number} v20 The values at (2, 0).
+ * @param {number} v30 The values at (3, 0).
+ * @param {number} v01 The values at (0, 1).
+ * @param {number} v11 The values at (1, 1).
+ * @param {number} v21 The values at (2, 1).
+ * @param {number} v31 The values at (3, 1).
+ * @param {number} v02 The values at (0, 2).
+ * @param {number} v12 The values at (1, 2).
+ * @param {number} v22 The values at (2, 2).
+ * @param {number} v32 The values at (3, 2).
+ * @param {number} v03 The values at (0, 3).
+ * @param {number} v13 The values at (1, 3).
+ * @param {number} v23 The values at (2, 3).
+ * @param {number} v33 The values at (3, 3).
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.setFromValues = function(
+    mat, v00, v10, v20, v30, v01, v11, v21, v31, v02, v12, v22, v32,
+    v03, v13, v23, v33) {
+  mat[0] = v00;
+  mat[1] = v10;
+  mat[2] = v20;
+  mat[3] = v30;
+  mat[4] = v01;
+  mat[5] = v11;
+  mat[6] = v21;
+  mat[7] = v31;
+  mat[8] = v02;
+  mat[9] = v12;
+  mat[10] = v22;
+  mat[11] = v32;
+  mat[12] = v03;
+  mat[13] = v13;
+  mat[14] = v23;
+  mat[15] = v33;
+  return mat;
+};
+
+
+/**
+ * Sets the matrix from the array of values stored in column major order.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix to receive the values.
+ * @param {goog.vec.Mat4.AnyType} values The column major ordered
+ *     array of values to store in the matrix.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.setFromArray = function(mat, values) {
+  mat[0] = values[0];
+  mat[1] = values[1];
+  mat[2] = values[2];
+  mat[3] = values[3];
+  mat[4] = values[4];
+  mat[5] = values[5];
+  mat[6] = values[6];
+  mat[7] = values[7];
+  mat[8] = values[8];
+  mat[9] = values[9];
+  mat[10] = values[10];
+  mat[11] = values[11];
+  mat[12] = values[12];
+  mat[13] = values[13];
+  mat[14] = values[14];
+  mat[15] = values[15];
+  return mat;
+};
+
+
+/**
+ * Sets the matrix from the array of values stored in row major order.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix to receive the values.
+ * @param {goog.vec.Mat4.AnyType} values The row major ordered array of
+ *     values to store in the matrix.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.setFromRowMajorArray = function(mat, values) {
+  mat[0] = values[0];
+  mat[1] = values[4];
+  mat[2] = values[8];
+  mat[3] = values[12];
+
+  mat[4] = values[1];
+  mat[5] = values[5];
+  mat[6] = values[9];
+  mat[7] = values[13];
+
+  mat[8] = values[2];
+  mat[9] = values[6];
+  mat[10] = values[10];
+  mat[11] = values[14];
+
+  mat[12] = values[3];
+  mat[13] = values[7];
+  mat[14] = values[11];
+  mat[15] = values[15];
+
+  return mat;
+};
+
+
+/**
+ * Sets the diagonal values of the matrix from the given values.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix to receive the values.
+ * @param {number} v00 The values for (0, 0).
+ * @param {number} v11 The values for (1, 1).
+ * @param {number} v22 The values for (2, 2).
+ * @param {number} v33 The values for (3, 3).
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.setDiagonalValues = function(mat, v00, v11, v22, v33) {
+  mat[0] = v00;
+  mat[5] = v11;
+  mat[10] = v22;
+  mat[15] = v33;
+  return mat;
+};
+
+
+/**
+ * Sets the diagonal values of the matrix from the given vector.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix to receive the values.
+ * @param {goog.vec.Vec4.AnyType} vec The vector containing the values.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.setDiagonal = function(mat, vec) {
+  mat[0] = vec[0];
+  mat[5] = vec[1];
+  mat[10] = vec[2];
+  mat[15] = vec[3];
+  return mat;
+};
+
+
+/**
+ * Gets the diagonal values of the matrix into the given vector.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix containing the values.
+ * @param {goog.vec.Vec4.AnyType} vec The vector to receive the values.
+ * @param {number=} opt_diagonal Which diagonal to get. A value of 0 selects the
+ *     main diagonal, a positive number selects a super diagonal and a negative
+ *     number selects a sub diagonal.
+ * @return {goog.vec.Vec4.AnyType} return vec so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.getDiagonal = function(mat, vec, opt_diagonal) {
+  if (!opt_diagonal) {
+    // This is the most common case, so we avoid the for loop.
+    vec[0] = mat[0];
+    vec[1] = mat[5];
+    vec[2] = mat[10];
+    vec[3] = mat[15];
+  } else {
+    var offset = opt_diagonal > 0 ? 4 * opt_diagonal : -opt_diagonal;
+    for (var i = 0; i < 4 - Math.abs(opt_diagonal); i++) {
+      vec[i] = mat[offset + 5 * i];
+    }
+  }
+  return vec;
+};
+
+
+/**
+ * Sets the specified column with the supplied values.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix to recieve the values.
+ * @param {number} column The column index to set the values on.
+ * @param {number} v0 The value for row 0.
+ * @param {number} v1 The value for row 1.
+ * @param {number} v2 The value for row 2.
+ * @param {number} v3 The value for row 3.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.setColumnValues = function(mat, column, v0, v1, v2, v3) {
+  var i = column * 4;
+  mat[i] = v0;
+  mat[i + 1] = v1;
+  mat[i + 2] = v2;
+  mat[i + 3] = v3;
+  return mat;
+};
+
+
+/**
+ * Sets the specified column with the value from the supplied vector.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix to receive the values.
+ * @param {number} column The column index to set the values on.
+ * @param {goog.vec.Vec4.AnyType} vec The vector of elements for the column.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.setColumn = function(mat, column, vec) {
+  var i = column * 4;
+  mat[i] = vec[0];
+  mat[i + 1] = vec[1];
+  mat[i + 2] = vec[2];
+  mat[i + 3] = vec[3];
+  return mat;
+};
+
+
+/**
+ * Retrieves the specified column from the matrix into the given vector.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix supplying the values.
+ * @param {number} column The column to get the values from.
+ * @param {goog.vec.Vec4.AnyType} vec The vector of elements to
+ *     receive the column.
+ * @return {goog.vec.Vec4.AnyType} return vec so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.getColumn = function(mat, column, vec) {
+  var i = column * 4;
+  vec[0] = mat[i];
+  vec[1] = mat[i + 1];
+  vec[2] = mat[i + 2];
+  vec[3] = mat[i + 3];
+  return vec;
+};
+
+
+/**
+ * Sets the columns of the matrix from the given vectors.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix to receive the values.
+ * @param {goog.vec.Vec4.AnyType} vec0 The values for column 0.
+ * @param {goog.vec.Vec4.AnyType} vec1 The values for column 1.
+ * @param {goog.vec.Vec4.AnyType} vec2 The values for column 2.
+ * @param {goog.vec.Vec4.AnyType} vec3 The values for column 3.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.setColumns = function(mat, vec0, vec1, vec2, vec3) {
+  goog.vec.Mat4.setColumn(mat, 0, vec0);
+  goog.vec.Mat4.setColumn(mat, 1, vec1);
+  goog.vec.Mat4.setColumn(mat, 2, vec2);
+  goog.vec.Mat4.setColumn(mat, 3, vec3);
+  return mat;
+};
+
+
+/**
+ * Retrieves the column values from the given matrix into the given vectors.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix supplying the columns.
+ * @param {goog.vec.Vec4.AnyType} vec0 The vector to receive column 0.
+ * @param {goog.vec.Vec4.AnyType} vec1 The vector to receive column 1.
+ * @param {goog.vec.Vec4.AnyType} vec2 The vector to receive column 2.
+ * @param {goog.vec.Vec4.AnyType} vec3 The vector to receive column 3.
+ */
+goog.vec.Mat4.getColumns = function(mat, vec0, vec1, vec2, vec3) {
+  goog.vec.Mat4.getColumn(mat, 0, vec0);
+  goog.vec.Mat4.getColumn(mat, 1, vec1);
+  goog.vec.Mat4.getColumn(mat, 2, vec2);
+  goog.vec.Mat4.getColumn(mat, 3, vec3);
+};
+
+
+/**
+ * Sets the row values from the supplied values.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix to receive the values.
+ * @param {number} row The index of the row to receive the values.
+ * @param {number} v0 The value for column 0.
+ * @param {number} v1 The value for column 1.
+ * @param {number} v2 The value for column 2.
+ * @param {number} v3 The value for column 3.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.setRowValues = function(mat, row, v0, v1, v2, v3) {
+  mat[row] = v0;
+  mat[row + 4] = v1;
+  mat[row + 8] = v2;
+  mat[row + 12] = v3;
+  return mat;
+};
+
+
+/**
+ * Sets the row values from the supplied vector.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix to receive the row values.
+ * @param {number} row The index of the row.
+ * @param {goog.vec.Vec4.AnyType} vec The vector containing the values.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.setRow = function(mat, row, vec) {
+  mat[row] = vec[0];
+  mat[row + 4] = vec[1];
+  mat[row + 8] = vec[2];
+  mat[row + 12] = vec[3];
+  return mat;
+};
+
+
+/**
+ * Retrieves the row values into the given vector.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix supplying the values.
+ * @param {number} row The index of the row supplying the values.
+ * @param {goog.vec.Vec4.AnyType} vec The vector to receive the row.
+ * @return {goog.vec.Vec4.AnyType} return vec so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.getRow = function(mat, row, vec) {
+  vec[0] = mat[row];
+  vec[1] = mat[row + 4];
+  vec[2] = mat[row + 8];
+  vec[3] = mat[row + 12];
+  return vec;
+};
+
+
+/**
+ * Sets the rows of the matrix from the supplied vectors.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix to receive the values.
+ * @param {goog.vec.Vec4.AnyType} vec0 The values for row 0.
+ * @param {goog.vec.Vec4.AnyType} vec1 The values for row 1.
+ * @param {goog.vec.Vec4.AnyType} vec2 The values for row 2.
+ * @param {goog.vec.Vec4.AnyType} vec3 The values for row 3.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.setRows = function(mat, vec0, vec1, vec2, vec3) {
+  goog.vec.Mat4.setRow(mat, 0, vec0);
+  goog.vec.Mat4.setRow(mat, 1, vec1);
+  goog.vec.Mat4.setRow(mat, 2, vec2);
+  goog.vec.Mat4.setRow(mat, 3, vec3);
+  return mat;
+};
+
+
+/**
+ * Retrieves the rows of the matrix into the supplied vectors.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix to supply the values.
+ * @param {goog.vec.Vec4.AnyType} vec0 The vector to receive row 0.
+ * @param {goog.vec.Vec4.AnyType} vec1 The vector to receive row 1.
+ * @param {goog.vec.Vec4.AnyType} vec2 The vector to receive row 2.
+ * @param {goog.vec.Vec4.AnyType} vec3 The vector to receive row 3.
+ */
+goog.vec.Mat4.getRows = function(mat, vec0, vec1, vec2, vec3) {
+  goog.vec.Mat4.getRow(mat, 0, vec0);
+  goog.vec.Mat4.getRow(mat, 1, vec1);
+  goog.vec.Mat4.getRow(mat, 2, vec2);
+  goog.vec.Mat4.getRow(mat, 3, vec3);
+};
+
+
+/**
+ * Makes the given 4x4 matrix the zero matrix.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @return {!goog.vec.Mat4.AnyType} return mat so operations can be chained.
+ */
+goog.vec.Mat4.makeZero = function(mat) {
+  mat[0] = 0;
+  mat[1] = 0;
+  mat[2] = 0;
+  mat[3] = 0;
+  mat[4] = 0;
+  mat[5] = 0;
+  mat[6] = 0;
+  mat[7] = 0;
+  mat[8] = 0;
+  mat[9] = 0;
+  mat[10] = 0;
+  mat[11] = 0;
+  mat[12] = 0;
+  mat[13] = 0;
+  mat[14] = 0;
+  mat[15] = 0;
+  return mat;
+};
+
+
+/**
+ * Makes the given 4x4 matrix the identity matrix.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @return {goog.vec.Mat4.AnyType} return mat so operations can be chained.
+ */
+goog.vec.Mat4.makeIdentity = function(mat) {
+  mat[0] = 1;
+  mat[1] = 0;
+  mat[2] = 0;
+  mat[3] = 0;
+  mat[4] = 0;
+  mat[5] = 1;
+  mat[6] = 0;
+  mat[7] = 0;
+  mat[8] = 0;
+  mat[9] = 0;
+  mat[10] = 1;
+  mat[11] = 0;
+  mat[12] = 0;
+  mat[13] = 0;
+  mat[14] = 0;
+  mat[15] = 1;
+  return mat;
+};
+
+
+/**
+ * Performs a per-component addition of the matrix mat0 and mat1, storing
+ * the result into resultMat.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat0 The first addend.
+ * @param {goog.vec.Mat4.AnyType} mat1 The second addend.
+ * @param {goog.vec.Mat4.AnyType} resultMat The matrix to
+ *     receive the results (may be either mat0 or mat1).
+ * @return {goog.vec.Mat4.AnyType} return resultMat so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.addMat = function(mat0, mat1, resultMat) {
+  resultMat[0] = mat0[0] + mat1[0];
+  resultMat[1] = mat0[1] + mat1[1];
+  resultMat[2] = mat0[2] + mat1[2];
+  resultMat[3] = mat0[3] + mat1[3];
+  resultMat[4] = mat0[4] + mat1[4];
+  resultMat[5] = mat0[5] + mat1[5];
+  resultMat[6] = mat0[6] + mat1[6];
+  resultMat[7] = mat0[7] + mat1[7];
+  resultMat[8] = mat0[8] + mat1[8];
+  resultMat[9] = mat0[9] + mat1[9];
+  resultMat[10] = mat0[10] + mat1[10];
+  resultMat[11] = mat0[11] + mat1[11];
+  resultMat[12] = mat0[12] + mat1[12];
+  resultMat[13] = mat0[13] + mat1[13];
+  resultMat[14] = mat0[14] + mat1[14];
+  resultMat[15] = mat0[15] + mat1[15];
+  return resultMat;
+};
+
+
+/**
+ * Performs a per-component subtraction of the matrix mat0 and mat1,
+ * storing the result into resultMat.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat0 The minuend.
+ * @param {goog.vec.Mat4.AnyType} mat1 The subtrahend.
+ * @param {goog.vec.Mat4.AnyType} resultMat The matrix to receive
+ *     the results (may be either mat0 or mat1).
+ * @return {goog.vec.Mat4.AnyType} return resultMat so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.subMat = function(mat0, mat1, resultMat) {
+  resultMat[0] = mat0[0] - mat1[0];
+  resultMat[1] = mat0[1] - mat1[1];
+  resultMat[2] = mat0[2] - mat1[2];
+  resultMat[3] = mat0[3] - mat1[3];
+  resultMat[4] = mat0[4] - mat1[4];
+  resultMat[5] = mat0[5] - mat1[5];
+  resultMat[6] = mat0[6] - mat1[6];
+  resultMat[7] = mat0[7] - mat1[7];
+  resultMat[8] = mat0[8] - mat1[8];
+  resultMat[9] = mat0[9] - mat1[9];
+  resultMat[10] = mat0[10] - mat1[10];
+  resultMat[11] = mat0[11] - mat1[11];
+  resultMat[12] = mat0[12] - mat1[12];
+  resultMat[13] = mat0[13] - mat1[13];
+  resultMat[14] = mat0[14] - mat1[14];
+  resultMat[15] = mat0[15] - mat1[15];
+  return resultMat;
+};
+
+
+/**
+ * Multiplies matrix mat with the given scalar, storing the result
+ * into resultMat.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {number} scalar The scalar value to multiply to each element of mat.
+ * @param {goog.vec.Mat4.AnyType} resultMat The matrix to receive
+ *     the results (may be mat).
+ * @return {goog.vec.Mat4.AnyType} return resultMat so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.multScalar = function(mat, scalar, resultMat) {
+  resultMat[0] = mat[0] * scalar;
+  resultMat[1] = mat[1] * scalar;
+  resultMat[2] = mat[2] * scalar;
+  resultMat[3] = mat[3] * scalar;
+  resultMat[4] = mat[4] * scalar;
+  resultMat[5] = mat[5] * scalar;
+  resultMat[6] = mat[6] * scalar;
+  resultMat[7] = mat[7] * scalar;
+  resultMat[8] = mat[8] * scalar;
+  resultMat[9] = mat[9] * scalar;
+  resultMat[10] = mat[10] * scalar;
+  resultMat[11] = mat[11] * scalar;
+  resultMat[12] = mat[12] * scalar;
+  resultMat[13] = mat[13] * scalar;
+  resultMat[14] = mat[14] * scalar;
+  resultMat[15] = mat[15] * scalar;
+  return resultMat;
+};
+
+
+/**
+ * Multiplies the two matrices mat0 and mat1 using matrix multiplication,
+ * storing the result into resultMat.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat0 The first (left hand) matrix.
+ * @param {goog.vec.Mat4.AnyType} mat1 The second (right hand) matrix.
+ * @param {goog.vec.Mat4.AnyType} resultMat The matrix to receive
+ *     the results (may be either mat0 or mat1).
+ * @return {goog.vec.Mat4.AnyType} return resultMat so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.multMat = function(mat0, mat1, resultMat) {
+  var a00 = mat0[0], a10 = mat0[1], a20 = mat0[2], a30 = mat0[3];
+  var a01 = mat0[4], a11 = mat0[5], a21 = mat0[6], a31 = mat0[7];
+  var a02 = mat0[8], a12 = mat0[9], a22 = mat0[10], a32 = mat0[11];
+  var a03 = mat0[12], a13 = mat0[13], a23 = mat0[14], a33 = mat0[15];
+
+  var b00 = mat1[0], b10 = mat1[1], b20 = mat1[2], b30 = mat1[3];
+  var b01 = mat1[4], b11 = mat1[5], b21 = mat1[6], b31 = mat1[7];
+  var b02 = mat1[8], b12 = mat1[9], b22 = mat1[10], b32 = mat1[11];
+  var b03 = mat1[12], b13 = mat1[13], b23 = mat1[14], b33 = mat1[15];
+
+  resultMat[0] = a00 * b00 + a01 * b10 + a02 * b20 + a03 * b30;
+  resultMat[1] = a10 * b00 + a11 * b10 + a12 * b20 + a13 * b30;
+  resultMat[2] = a20 * b00 + a21 * b10 + a22 * b20 + a23 * b30;
+  resultMat[3] = a30 * b00 + a31 * b10 + a32 * b20 + a33 * b30;
+
+  resultMat[4] = a00 * b01 + a01 * b11 + a02 * b21 + a03 * b31;
+  resultMat[5] = a10 * b01 + a11 * b11 + a12 * b21 + a13 * b31;
+  resultMat[6] = a20 * b01 + a21 * b11 + a22 * b21 + a23 * b31;
+  resultMat[7] = a30 * b01 + a31 * b11 + a32 * b21 + a33 * b31;
+
+  resultMat[8] = a00 * b02 + a01 * b12 + a02 * b22 + a03 * b32;
+  resultMat[9] = a10 * b02 + a11 * b12 + a12 * b22 + a13 * b32;
+  resultMat[10] = a20 * b02 + a21 * b12 + a22 * b22 + a23 * b32;
+  resultMat[11] = a30 * b02 + a31 * b12 + a32 * b22 + a33 * b32;
+
+  resultMat[12] = a00 * b03 + a01 * b13 + a02 * b23 + a03 * b33;
+  resultMat[13] = a10 * b03 + a11 * b13 + a12 * b23 + a13 * b33;
+  resultMat[14] = a20 * b03 + a21 * b13 + a22 * b23 + a23 * b33;
+  resultMat[15] = a30 * b03 + a31 * b13 + a32 * b23 + a33 * b33;
+  return resultMat;
+};
+
+
+/**
+ * Transposes the given matrix mat storing the result into resultMat.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix to transpose.
+ * @param {goog.vec.Mat4.AnyType} resultMat The matrix to receive
+ *     the results (may be mat).
+ * @return {goog.vec.Mat4.AnyType} return resultMat so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.transpose = function(mat, resultMat) {
+  if (resultMat == mat) {
+    var a10 = mat[1], a20 = mat[2], a30 = mat[3];
+    var a21 = mat[6], a31 = mat[7];
+    var a32 = mat[11];
+    resultMat[1] = mat[4];
+    resultMat[2] = mat[8];
+    resultMat[3] = mat[12];
+    resultMat[4] = a10;
+    resultMat[6] = mat[9];
+    resultMat[7] = mat[13];
+    resultMat[8] = a20;
+    resultMat[9] = a21;
+    resultMat[11] = mat[14];
+    resultMat[12] = a30;
+    resultMat[13] = a31;
+    resultMat[14] = a32;
+  } else {
+    resultMat[0] = mat[0];
+    resultMat[1] = mat[4];
+    resultMat[2] = mat[8];
+    resultMat[3] = mat[12];
+
+    resultMat[4] = mat[1];
+    resultMat[5] = mat[5];
+    resultMat[6] = mat[9];
+    resultMat[7] = mat[13];
+
+    resultMat[8] = mat[2];
+    resultMat[9] = mat[6];
+    resultMat[10] = mat[10];
+    resultMat[11] = mat[14];
+
+    resultMat[12] = mat[3];
+    resultMat[13] = mat[7];
+    resultMat[14] = mat[11];
+    resultMat[15] = mat[15];
+  }
+  return resultMat;
+};
+
+
+/**
+ * Computes the determinant of the matrix.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix to compute the matrix for.
+ * @return {number} The determinant of the matrix.
+ */
+goog.vec.Mat4.determinant = function(mat) {
+  var m00 = mat[0], m10 = mat[1], m20 = mat[2], m30 = mat[3];
+  var m01 = mat[4], m11 = mat[5], m21 = mat[6], m31 = mat[7];
+  var m02 = mat[8], m12 = mat[9], m22 = mat[10], m32 = mat[11];
+  var m03 = mat[12], m13 = mat[13], m23 = mat[14], m33 = mat[15];
+
+  var a0 = m00 * m11 - m10 * m01;
+  var a1 = m00 * m21 - m20 * m01;
+  var a2 = m00 * m31 - m30 * m01;
+  var a3 = m10 * m21 - m20 * m11;
+  var a4 = m10 * m31 - m30 * m11;
+  var a5 = m20 * m31 - m30 * m21;
+  var b0 = m02 * m13 - m12 * m03;
+  var b1 = m02 * m23 - m22 * m03;
+  var b2 = m02 * m33 - m32 * m03;
+  var b3 = m12 * m23 - m22 * m13;
+  var b4 = m12 * m33 - m32 * m13;
+  var b5 = m22 * m33 - m32 * m23;
+
+  return a0 * b5 - a1 * b4 + a2 * b3 + a3 * b2 - a4 * b1 + a5 * b0;
+};
+
+
+/**
+ * Computes the inverse of mat storing the result into resultMat. If the
+ * inverse is defined, this function returns true, false otherwise.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix to invert.
+ * @param {goog.vec.Mat4.AnyType} resultMat The matrix to receive
+ *     the result (may be mat).
+ * @return {boolean} True if the inverse is defined. If false is returned,
+ *     resultMat is not modified.
+ */
+goog.vec.Mat4.invert = function(mat, resultMat) {
+  var m00 = mat[0], m10 = mat[1], m20 = mat[2], m30 = mat[3];
+  var m01 = mat[4], m11 = mat[5], m21 = mat[6], m31 = mat[7];
+  var m02 = mat[8], m12 = mat[9], m22 = mat[10], m32 = mat[11];
+  var m03 = mat[12], m13 = mat[13], m23 = mat[14], m33 = mat[15];
+
+  var a0 = m00 * m11 - m10 * m01;
+  var a1 = m00 * m21 - m20 * m01;
+  var a2 = m00 * m31 - m30 * m01;
+  var a3 = m10 * m21 - m20 * m11;
+  var a4 = m10 * m31 - m30 * m11;
+  var a5 = m20 * m31 - m30 * m21;
+  var b0 = m02 * m13 - m12 * m03;
+  var b1 = m02 * m23 - m22 * m03;
+  var b2 = m02 * m33 - m32 * m03;
+  var b3 = m12 * m23 - m22 * m13;
+  var b4 = m12 * m33 - m32 * m13;
+  var b5 = m22 * m33 - m32 * m23;
+
+  var det = a0 * b5 - a1 * b4 + a2 * b3 + a3 * b2 - a4 * b1 + a5 * b0;
+  if (det == 0) {
+    return false;
+  }
+
+  var idet = 1.0 / det;
+  resultMat[0] = (m11 * b5 - m21 * b4 + m31 * b3) * idet;
+  resultMat[1] = (-m10 * b5 + m20 * b4 - m30 * b3) * idet;
+  resultMat[2] = (m13 * a5 - m23 * a4 + m33 * a3) * idet;
+  resultMat[3] = (-m12 * a5 + m22 * a4 - m32 * a3) * idet;
+  resultMat[4] = (-m01 * b5 + m21 * b2 - m31 * b1) * idet;
+  resultMat[5] = (m00 * b5 - m20 * b2 + m30 * b1) * idet;
+  resultMat[6] = (-m03 * a5 + m23 * a2 - m33 * a1) * idet;
+  resultMat[7] = (m02 * a5 - m22 * a2 + m32 * a1) * idet;
+  resultMat[8] = (m01 * b4 - m11 * b2 + m31 * b0) * idet;
+  resultMat[9] = (-m00 * b4 + m10 * b2 - m30 * b0) * idet;
+  resultMat[10] = (m03 * a4 - m13 * a2 + m33 * a0) * idet;
+  resultMat[11] = (-m02 * a4 + m12 * a2 - m32 * a0) * idet;
+  resultMat[12] = (-m01 * b3 + m11 * b1 - m21 * b0) * idet;
+  resultMat[13] = (m00 * b3 - m10 * b1 + m20 * b0) * idet;
+  resultMat[14] = (-m03 * a3 + m13 * a1 - m23 * a0) * idet;
+  resultMat[15] = (m02 * a3 - m12 * a1 + m22 * a0) * idet;
+  return true;
+};
+
+
+/**
+ * Returns true if the components of mat0 are equal to the components of mat1.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat0 The first matrix.
+ * @param {goog.vec.Mat4.AnyType} mat1 The second matrix.
+ * @return {boolean} True if the the two matrices are equivalent.
+ */
+goog.vec.Mat4.equals = function(mat0, mat1) {
+  return mat0.length == mat1.length &&
+      mat0[0] == mat1[0] &&
+      mat0[1] == mat1[1] &&
+      mat0[2] == mat1[2] &&
+      mat0[3] == mat1[3] &&
+      mat0[4] == mat1[4] &&
+      mat0[5] == mat1[5] &&
+      mat0[6] == mat1[6] &&
+      mat0[7] == mat1[7] &&
+      mat0[8] == mat1[8] &&
+      mat0[9] == mat1[9] &&
+      mat0[10] == mat1[10] &&
+      mat0[11] == mat1[11] &&
+      mat0[12] == mat1[12] &&
+      mat0[13] == mat1[13] &&
+      mat0[14] == mat1[14] &&
+      mat0[15] == mat1[15];
+};
+
+
+/**
+ * Transforms the given vector with the given matrix storing the resulting,
+ * transformed vector into resultVec. The input vector is multiplied against the
+ * upper 3x4 matrix omitting the projective component.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix supplying the transformation.
+ * @param {goog.vec.Vec3.AnyType} vec The 3 element vector to transform.
+ * @param {goog.vec.Vec3.AnyType} resultVec The 3 element vector to
+ *     receive the results (may be vec).
+ * @return {goog.vec.Vec3.AnyType} return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.multVec3 = function(mat, vec, resultVec) {
+  var x = vec[0], y = vec[1], z = vec[2];
+  resultVec[0] = x * mat[0] + y * mat[4] + z * mat[8] + mat[12];
+  resultVec[1] = x * mat[1] + y * mat[5] + z * mat[9] + mat[13];
+  resultVec[2] = x * mat[2] + y * mat[6] + z * mat[10] + mat[14];
+  return resultVec;
+};
+
+
+/**
+ * Transforms the given vector with the given matrix storing the resulting,
+ * transformed vector into resultVec. The input vector is multiplied against the
+ * upper 3x3 matrix omitting the projective component and translation
+ * components.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix supplying the transformation.
+ * @param {goog.vec.Vec3.AnyType} vec The 3 element vector to transform.
+ * @param {goog.vec.Vec3.AnyType} resultVec The 3 element vector to
+ *     receive the results (may be vec).
+ * @return {goog.vec.Vec3.AnyType} return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.multVec3NoTranslate = function(mat, vec, resultVec) {
+  var x = vec[0], y = vec[1], z = vec[2];
+  resultVec[0] = x * mat[0] + y * mat[4] + z * mat[8];
+  resultVec[1] = x * mat[1] + y * mat[5] + z * mat[9];
+  resultVec[2] = x * mat[2] + y * mat[6] + z * mat[10];
+  return resultVec;
+};
+
+
+/**
+ * Transforms the given vector with the given matrix storing the resulting,
+ * transformed vector into resultVec. The input vector is multiplied against the
+ * full 4x4 matrix with the homogeneous divide applied to reduce the 4 element
+ * vector to a 3 element vector.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix supplying the transformation.
+ * @param {goog.vec.Vec3.AnyType} vec The 3 element vector to transform.
+ * @param {goog.vec.Vec3.AnyType} resultVec The 3 element vector
+ *     to receive the results (may be vec).
+ * @return {goog.vec.Vec3.AnyType} return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.multVec3Projective = function(mat, vec, resultVec) {
+  var x = vec[0], y = vec[1], z = vec[2];
+  var invw = 1 / (x * mat[3] + y * mat[7] + z * mat[11] + mat[15]);
+  resultVec[0] = (x * mat[0] + y * mat[4] + z * mat[8] + mat[12]) * invw;
+  resultVec[1] = (x * mat[1] + y * mat[5] + z * mat[9] + mat[13]) * invw;
+  resultVec[2] = (x * mat[2] + y * mat[6] + z * mat[10] + mat[14]) * invw;
+  return resultVec;
+};
+
+
+/**
+ * Transforms the given vector with the given matrix storing the resulting,
+ * transformed vector into resultVec.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix supplying the transformation.
+ * @param {goog.vec.Vec4.AnyType} vec The vector to transform.
+ * @param {goog.vec.Vec4.AnyType} resultVec The vector to
+ *     receive the results (may be vec).
+ * @return {goog.vec.Vec4.AnyType} return resultVec so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.multVec4 = function(mat, vec, resultVec) {
+  var x = vec[0], y = vec[1], z = vec[2], w = vec[3];
+  resultVec[0] = x * mat[0] + y * mat[4] + z * mat[8] + w * mat[12];
+  resultVec[1] = x * mat[1] + y * mat[5] + z * mat[9] + w * mat[13];
+  resultVec[2] = x * mat[2] + y * mat[6] + z * mat[10] + w * mat[14];
+  resultVec[3] = x * mat[3] + y * mat[7] + z * mat[11] + w * mat[15];
+  return resultVec;
+};
+
+
+/**
+ * Makes the given 4x4 matrix a translation matrix with x, y and z
+ * translation factors.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {number} x The translation along the x axis.
+ * @param {number} y The translation along the y axis.
+ * @param {number} z The translation along the z axis.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.makeTranslate = function(mat, x, y, z) {
+  goog.vec.Mat4.makeIdentity(mat);
+  return goog.vec.Mat4.setColumnValues(mat, 3, x, y, z, 1);
+};
+
+
+/**
+ * Makes the given 4x4 matrix as a scale matrix with x, y and z scale factors.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {number} x The scale along the x axis.
+ * @param {number} y The scale along the y axis.
+ * @param {number} z The scale along the z axis.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.makeScale = function(mat, x, y, z) {
+  goog.vec.Mat4.makeIdentity(mat);
+  return goog.vec.Mat4.setDiagonalValues(mat, x, y, z, 1);
+};
+
+
+/**
+ * Makes the given 4x4 matrix a rotation matrix with the given rotation
+ * angle about the axis defined by the vector (ax, ay, az).
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {number} angle The rotation angle in radians.
+ * @param {number} ax The x component of the rotation axis.
+ * @param {number} ay The y component of the rotation axis.
+ * @param {number} az The z component of the rotation axis.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.makeRotate = function(mat, angle, ax, ay, az) {
+  var c = Math.cos(angle);
+  var d = 1 - c;
+  var s = Math.sin(angle);
+
+  return goog.vec.Mat4.setFromValues(mat,
+      ax * ax * d + c,
+      ax * ay * d + az * s,
+      ax * az * d - ay * s,
+      0,
+
+      ax * ay * d - az * s,
+      ay * ay * d + c,
+      ay * az * d + ax * s,
+      0,
+
+      ax * az * d + ay * s,
+      ay * az * d - ax * s,
+      az * az * d + c,
+      0,
+
+      0, 0, 0, 1);
+};
+
+
+/**
+ * Makes the given 4x4 matrix a rotation matrix with the given rotation
+ * angle about the X axis.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {number} angle The rotation angle in radians.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.makeRotateX = function(mat, angle) {
+  var c = Math.cos(angle);
+  var s = Math.sin(angle);
+  return goog.vec.Mat4.setFromValues(
+      mat, 1, 0, 0, 0, 0, c, s, 0, 0, -s, c, 0, 0, 0, 0, 1);
+};
+
+
+/**
+ * Makes the given 4x4 matrix a rotation matrix with the given rotation
+ * angle about the Y axis.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {number} angle The rotation angle in radians.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.makeRotateY = function(mat, angle) {
+  var c = Math.cos(angle);
+  var s = Math.sin(angle);
+  return goog.vec.Mat4.setFromValues(
+      mat, c, 0, -s, 0, 0, 1, 0, 0, s, 0, c, 0, 0, 0, 0, 1);
+};
+
+
+/**
+ * Makes the given 4x4 matrix a rotation matrix with the given rotation
+ * angle about the Z axis.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {number} angle The rotation angle in radians.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.makeRotateZ = function(mat, angle) {
+  var c = Math.cos(angle);
+  var s = Math.sin(angle);
+  return goog.vec.Mat4.setFromValues(
+      mat, c, s, 0, 0, -s, c, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1);
+};
+
+
+/**
+ * Makes the given 4x4 matrix a perspective projection matrix.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {number} left The coordinate of the left clipping plane.
+ * @param {number} right The coordinate of the right clipping plane.
+ * @param {number} bottom The coordinate of the bottom clipping plane.
+ * @param {number} top The coordinate of the top clipping plane.
+ * @param {number} near The distance to the near clipping plane.
+ * @param {number} far The distance to the far clipping plane.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.makeFrustum = function(mat, left, right, bottom, top, near, far) {
+  var x = (2 * near) / (right - left);
+  var y = (2 * near) / (top - bottom);
+  var a = (right + left) / (right - left);
+  var b = (top + bottom) / (top - bottom);
+  var c = -(far + near) / (far - near);
+  var d = -(2 * far * near) / (far - near);
+
+  return goog.vec.Mat4.setFromValues(mat,
+      x, 0, 0, 0,
+      0, y, 0, 0,
+      a, b, c, -1,
+      0, 0, d, 0
+  );
+};
+
+
+/**
+ * Makse the given 4x4 matrix  perspective projection matrix given a
+ * field of view and aspect ratio.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {number} fovy The field of view along the y (vertical) axis in
+ *     radians.
+ * @param {number} aspect The x (width) to y (height) aspect ratio.
+ * @param {number} near The distance to the near clipping plane.
+ * @param {number} far The distance to the far clipping plane.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.makePerspective = function(mat, fovy, aspect, near, far) {
+  var angle = fovy / 2;
+  var dz = far - near;
+  var sinAngle = Math.sin(angle);
+  if (dz == 0 || sinAngle == 0 || aspect == 0) {
+    return mat;
+  }
+
+  var cot = Math.cos(angle) / sinAngle;
+  return goog.vec.Mat4.setFromValues(mat,
+      cot / aspect, 0, 0, 0,
+      0, cot, 0, 0,
+      0, 0, -(far + near) / dz, -1,
+      0, 0, -(2 * near * far) / dz, 0
+  );
+};
+
+
+/**
+ * Makes the given 4x4 matrix an orthographic projection matrix.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {number} left The coordinate of the left clipping plane.
+ * @param {number} right The coordinate of the right clipping plane.
+ * @param {number} bottom The coordinate of the bottom clipping plane.
+ * @param {number} top The coordinate of the top clipping plane.
+ * @param {number} near The distance to the near clipping plane.
+ * @param {number} far The distance to the far clipping plane.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.makeOrtho = function(mat, left, right, bottom, top, near, far) {
+  var x = 2 / (right - left);
+  var y = 2 / (top - bottom);
+  var z = -2 / (far - near);
+  var a = -(right + left) / (right - left);
+  var b = -(top + bottom) / (top - bottom);
+  var c = -(far + near) / (far - near);
+
+  return goog.vec.Mat4.setFromValues(mat,
+      x, 0, 0, 0,
+      0, y, 0, 0,
+      0, 0, z, 0,
+      a, b, c, 1
+  );
+};
+
+
+/**
+ * Makes the given 4x4 matrix a modelview matrix of a camera so that
+ * the camera is 'looking at' the given center point.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {goog.vec.Vec3.AnyType} eyePt The position of the eye point
+ *     (camera origin).
+ * @param {goog.vec.Vec3.AnyType} centerPt The point to aim the camera at.
+ * @param {goog.vec.Vec3.AnyType} worldUpVec The vector that identifies
+ *     the up direction for the camera.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.makeLookAt = function(mat, eyePt, centerPt, worldUpVec) {
+  // Compute the direction vector from the eye point to the center point and
+  // normalize.
+  var fwdVec = goog.vec.Mat4.tmpVec4_[0];
+  goog.vec.Vec3.subtract(centerPt, eyePt, fwdVec);
+  goog.vec.Vec3.normalize(fwdVec, fwdVec);
+  fwdVec[3] = 0;
+
+  // Compute the side vector from the forward vector and the input up vector.
+  var sideVec = goog.vec.Mat4.tmpVec4_[1];
+  goog.vec.Vec3.cross(fwdVec, worldUpVec, sideVec);
+  goog.vec.Vec3.normalize(sideVec, sideVec);
+  sideVec[3] = 0;
+
+  // Now the up vector to form the orthonormal basis.
+  var upVec = goog.vec.Mat4.tmpVec4_[2];
+  goog.vec.Vec3.cross(sideVec, fwdVec, upVec);
+  goog.vec.Vec3.normalize(upVec, upVec);
+  upVec[3] = 0;
+
+  // Update the view matrix with the new orthonormal basis and position the
+  // camera at the given eye point.
+  goog.vec.Vec3.negate(fwdVec, fwdVec);
+  goog.vec.Mat4.setRow(mat, 0, sideVec);
+  goog.vec.Mat4.setRow(mat, 1, upVec);
+  goog.vec.Mat4.setRow(mat, 2, fwdVec);
+  goog.vec.Mat4.setRowValues(mat, 3, 0, 0, 0, 1);
+  goog.vec.Mat4.translate(
+      mat, -eyePt[0], -eyePt[1], -eyePt[2]);
+
+  return mat;
+};
+
+
+/**
+ * Decomposes a matrix into the lookAt vectors eyePt, fwdVec and worldUpVec.
+ * The matrix represents the modelview matrix of a camera. It is the inverse
+ * of lookAt except for the output of the fwdVec instead of centerPt.
+ * The centerPt itself cannot be recovered from a modelview matrix.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {goog.vec.Vec3.AnyType} eyePt The position of the eye point
+ *     (camera origin).
+ * @param {goog.vec.Vec3.AnyType} fwdVec The vector describing where
+ *     the camera points to.
+ * @param {goog.vec.Vec3.AnyType} worldUpVec The vector that
+ *     identifies the up direction for the camera.
+ * @return {boolean} True if the method succeeds, false otherwise.
+ *     The method can only fail if the inverse of viewMatrix is not defined.
+ */
+goog.vec.Mat4.toLookAt = function(mat, eyePt, fwdVec, worldUpVec) {
+  // Get eye of the camera.
+  var matInverse = goog.vec.Mat4.tmpMat4_[0];
+  if (!goog.vec.Mat4.invert(mat, matInverse)) {
+    // The input matrix does not have a valid inverse.
+    return false;
+  }
+
+  if (eyePt) {
+    eyePt[0] = matInverse[12];
+    eyePt[1] = matInverse[13];
+    eyePt[2] = matInverse[14];
+  }
+
+  // Get forward vector from the definition of lookAt.
+  if (fwdVec || worldUpVec) {
+    if (!fwdVec) {
+      fwdVec = goog.vec.Mat4.tmpVec3_[0];
+    }
+    fwdVec[0] = -mat[2];
+    fwdVec[1] = -mat[6];
+    fwdVec[2] = -mat[10];
+    // Normalize forward vector.
+    goog.vec.Vec3.normalize(fwdVec, fwdVec);
+  }
+
+  if (worldUpVec) {
+    // Get side vector from the definition of gluLookAt.
+    var side = goog.vec.Mat4.tmpVec3_[1];
+    side[0] = mat[0];
+    side[1] = mat[4];
+    side[2] = mat[8];
+    // Compute up vector as a up = side x forward.
+    goog.vec.Vec3.cross(side, fwdVec, worldUpVec);
+    // Normalize up vector.
+    goog.vec.Vec3.normalize(worldUpVec, worldUpVec);
+  }
+  return true;
+};
+
+
+/**
+ * Makes the given 4x4 matrix a rotation matrix given Euler angles using
+ * the ZXZ convention.
+ * Given the euler angles [theta1, theta2, theta3], the rotation is defined as
+ * rotation = rotation_z(theta1) * rotation_x(theta2) * rotation_z(theta3),
+ * with theta1 in [0, 2 * pi], theta2 in [0, pi] and theta3 in [0, 2 * pi].
+ * rotation_x(theta) means rotation around the X axis of theta radians,
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {number} theta1 The angle of rotation around the Z axis in radians.
+ * @param {number} theta2 The angle of rotation around the X axis in radians.
+ * @param {number} theta3 The angle of rotation around the Z axis in radians.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.makeEulerZXZ = function(mat, theta1, theta2, theta3) {
+  var c1 = Math.cos(theta1);
+  var s1 = Math.sin(theta1);
+
+  var c2 = Math.cos(theta2);
+  var s2 = Math.sin(theta2);
+
+  var c3 = Math.cos(theta3);
+  var s3 = Math.sin(theta3);
+
+  mat[0] = c1 * c3 - c2 * s1 * s3;
+  mat[1] = c2 * c1 * s3 + c3 * s1;
+  mat[2] = s3 * s2;
+  mat[3] = 0;
+
+  mat[4] = -c1 * s3 - c3 * c2 * s1;
+  mat[5] = c1 * c2 * c3 - s1 * s3;
+  mat[6] = c3 * s2;
+  mat[7] = 0;
+
+  mat[8] = s2 * s1;
+  mat[9] = -c1 * s2;
+  mat[10] = c2;
+  mat[11] = 0;
+
+  mat[12] = 0;
+  mat[13] = 0;
+  mat[14] = 0;
+  mat[15] = 1;
+
+  return mat;
+};
+
+
+/**
+ * Decomposes a rotation matrix into Euler angles using the ZXZ convention so
+ * that rotation = rotation_z(theta1) * rotation_x(theta2) * rotation_z(theta3),
+ * with theta1 in [0, 2 * pi], theta2 in [0, pi] and theta3 in [0, 2 * pi].
+ * rotation_x(theta) means rotation around the X axis of theta radians.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {goog.vec.Vec3.AnyType} euler The ZXZ Euler angles in
+ *     radians as [theta1, theta2, theta3].
+ * @param {boolean=} opt_theta2IsNegative Whether theta2 is in [-pi, 0] instead
+ *     of the default [0, pi].
+ * @return {goog.vec.Vec4.AnyType} return euler so that operations can be
+ *     chained together.
+ */
+goog.vec.Mat4.toEulerZXZ = function(mat, euler, opt_theta2IsNegative) {
+  // There is an ambiguity in the sign of sinTheta2 because of the sqrt.
+  var sinTheta2 = Math.sqrt(mat[2] * mat[2] + mat[6] * mat[6]);
+
+  // By default we explicitely constrain theta2 to be in [0, pi],
+  // so sinTheta2 is always positive. We can change the behavior and specify
+  // theta2 to be negative in [-pi, 0] with opt_Theta2IsNegative.
+  var signTheta2 = opt_theta2IsNegative ? -1 : 1;
+
+  if (sinTheta2 > goog.vec.EPSILON) {
+    euler[2] = Math.atan2(mat[2] * signTheta2, mat[6] * signTheta2);
+    euler[1] = Math.atan2(sinTheta2 * signTheta2, mat[10]);
+    euler[0] = Math.atan2(mat[8] * signTheta2, -mat[9] * signTheta2);
+  } else {
+    // There is also an arbitrary choice for theta1 = 0 or theta2 = 0 here.
+    // We assume theta1 = 0 as some applications do not allow the camera to roll
+    // (i.e. have theta1 != 0).
+    euler[0] = 0;
+    euler[1] = Math.atan2(sinTheta2 * signTheta2, mat[10]);
+    euler[2] = Math.atan2(mat[1], mat[0]);
+  }
+
+  // Atan2 outputs angles in [-pi, pi] so we bring them back to [0, 2 * pi].
+  euler[0] = (euler[0] + Math.PI * 2) % (Math.PI * 2);
+  euler[2] = (euler[2] + Math.PI * 2) % (Math.PI * 2);
+  // For theta2 we want the angle to be in [0, pi] or [-pi, 0] depending on
+  // signTheta2.
+  euler[1] = ((euler[1] * signTheta2 + Math.PI * 2) % (Math.PI * 2)) *
+      signTheta2;
+
+  return euler;
+};
+
+
+/**
+ * Translates the given matrix by x,y,z.  Equvialent to:
+ * goog.vec.Mat4.multMat(
+ *     mat,
+ *     goog.vec.Mat4.makeTranslate(goog.vec.Mat4.create(), x, y, z),
+ *     mat);
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {number} x The translation along the x axis.
+ * @param {number} y The translation along the y axis.
+ * @param {number} z The translation along the z axis.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.translate = function(mat, x, y, z) {
+  return goog.vec.Mat4.setColumnValues(
+      mat, 3,
+      mat[0] * x + mat[4] * y + mat[8] * z + mat[12],
+      mat[1] * x + mat[5] * y + mat[9] * z + mat[13],
+      mat[2] * x + mat[6] * y + mat[10] * z + mat[14],
+      mat[3] * x + mat[7] * y + mat[11] * z + mat[15]);
+};
+
+
+/**
+ * Scales the given matrix by x,y,z.  Equivalent to:
+ * goog.vec.Mat4.multMat(
+ *     mat,
+ *     goog.vec.Mat4.makeScale(goog.vec.Mat4.create(), x, y, z),
+ *     mat);
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {number} x The x scale factor.
+ * @param {number} y The y scale factor.
+ * @param {number} z The z scale factor.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.scale = function(mat, x, y, z) {
+  return goog.vec.Mat4.setFromValues(
+      mat,
+      mat[0] * x, mat[1] * x, mat[2] * x, mat[3] * x,
+      mat[4] * y, mat[5] * y, mat[6] * y, mat[7] * y,
+      mat[8] * z, mat[9] * z, mat[10] * z, mat[11] * z,
+      mat[12], mat[13], mat[14], mat[15]);
+};
+
+
+/**
+ * Rotate the given matrix by angle about the x,y,z axis.  Equivalent to:
+ * goog.vec.Mat4.multMat(
+ *     mat,
+ *     goog.vec.Mat4.makeRotate(goog.vec.Mat4.create(), angle, x, y, z),
+ *     mat);
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {number} angle The angle in radians.
+ * @param {number} x The x component of the rotation axis.
+ * @param {number} y The y component of the rotation axis.
+ * @param {number} z The z component of the rotation axis.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.rotate = function(mat, angle, x, y, z) {
+  var m00 = mat[0], m10 = mat[1], m20 = mat[2], m30 = mat[3];
+  var m01 = mat[4], m11 = mat[5], m21 = mat[6], m31 = mat[7];
+  var m02 = mat[8], m12 = mat[9], m22 = mat[10], m32 = mat[11];
+  var m03 = mat[12], m13 = mat[13], m23 = mat[14], m33 = mat[15];
+
+  var cosAngle = Math.cos(angle);
+  var sinAngle = Math.sin(angle);
+  var diffCosAngle = 1 - cosAngle;
+  var r00 = x * x * diffCosAngle + cosAngle;
+  var r10 = x * y * diffCosAngle + z * sinAngle;
+  var r20 = x * z * diffCosAngle - y * sinAngle;
+
+  var r01 = x * y * diffCosAngle - z * sinAngle;
+  var r11 = y * y * diffCosAngle + cosAngle;
+  var r21 = y * z * diffCosAngle + x * sinAngle;
+
+  var r02 = x * z * diffCosAngle + y * sinAngle;
+  var r12 = y * z * diffCosAngle - x * sinAngle;
+  var r22 = z * z * diffCosAngle + cosAngle;
+
+  return goog.vec.Mat4.setFromValues(
+      mat,
+      m00 * r00 + m01 * r10 + m02 * r20,
+      m10 * r00 + m11 * r10 + m12 * r20,
+      m20 * r00 + m21 * r10 + m22 * r20,
+      m30 * r00 + m31 * r10 + m32 * r20,
+
+      m00 * r01 + m01 * r11 + m02 * r21,
+      m10 * r01 + m11 * r11 + m12 * r21,
+      m20 * r01 + m21 * r11 + m22 * r21,
+      m30 * r01 + m31 * r11 + m32 * r21,
+
+      m00 * r02 + m01 * r12 + m02 * r22,
+      m10 * r02 + m11 * r12 + m12 * r22,
+      m20 * r02 + m21 * r12 + m22 * r22,
+      m30 * r02 + m31 * r12 + m32 * r22,
+
+      m03, m13, m23, m33);
+};
+
+
+/**
+ * Rotate the given matrix by angle about the x axis.  Equivalent to:
+ * goog.vec.Mat4.multMat(
+ *     mat,
+ *     goog.vec.Mat4.makeRotateX(goog.vec.Mat4.create(), angle),
+ *     mat);
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {number} angle The angle in radians.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.rotateX = function(mat, angle) {
+  var m01 = mat[4], m11 = mat[5], m21 = mat[6], m31 = mat[7];
+  var m02 = mat[8], m12 = mat[9], m22 = mat[10], m32 = mat[11];
+
+  var c = Math.cos(angle);
+  var s = Math.sin(angle);
+
+  mat[4] = m01 * c + m02 * s;
+  mat[5] = m11 * c + m12 * s;
+  mat[6] = m21 * c + m22 * s;
+  mat[7] = m31 * c + m32 * s;
+  mat[8] = m01 * -s + m02 * c;
+  mat[9] = m11 * -s + m12 * c;
+  mat[10] = m21 * -s + m22 * c;
+  mat[11] = m31 * -s + m32 * c;
+
+  return mat;
+};
+
+
+/**
+ * Rotate the given matrix by angle about the y axis.  Equivalent to:
+ * goog.vec.Mat4.multMat(
+ *     mat,
+ *     goog.vec.Mat4.makeRotateY(goog.vec.Mat4.create(), angle),
+ *     mat);
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {number} angle The angle in radians.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.rotateY = function(mat, angle) {
+  var m00 = mat[0], m10 = mat[1], m20 = mat[2], m30 = mat[3];
+  var m02 = mat[8], m12 = mat[9], m22 = mat[10], m32 = mat[11];
+
+  var c = Math.cos(angle);
+  var s = Math.sin(angle);
+
+  mat[0] = m00 * c + m02 * -s;
+  mat[1] = m10 * c + m12 * -s;
+  mat[2] = m20 * c + m22 * -s;
+  mat[3] = m30 * c + m32 * -s;
+  mat[8] = m00 * s + m02 * c;
+  mat[9] = m10 * s + m12 * c;
+  mat[10] = m20 * s + m22 * c;
+  mat[11] = m30 * s + m32 * c;
+
+  return mat;
+};
+
+
+/**
+ * Rotate the given matrix by angle about the z axis.  Equivalent to:
+ * goog.vec.Mat4.multMat(
+ *     mat,
+ *     goog.vec.Mat4.makeRotateZ(goog.vec.Mat4.create(), angle),
+ *     mat);
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The matrix.
+ * @param {number} angle The angle in radians.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.rotateZ = function(mat, angle) {
+  var m00 = mat[0], m10 = mat[1], m20 = mat[2], m30 = mat[3];
+  var m01 = mat[4], m11 = mat[5], m21 = mat[6], m31 = mat[7];
+
+  var c = Math.cos(angle);
+  var s = Math.sin(angle);
+
+  mat[0] = m00 * c + m01 * s;
+  mat[1] = m10 * c + m11 * s;
+  mat[2] = m20 * c + m21 * s;
+  mat[3] = m30 * c + m31 * s;
+  mat[4] = m00 * -s + m01 * c;
+  mat[5] = m10 * -s + m11 * c;
+  mat[6] = m20 * -s + m21 * c;
+  mat[7] = m30 * -s + m31 * c;
+
+  return mat;
+};
+
+
+/**
+ * Retrieves the translation component of the transformation matrix.
+ *
+ * @param {goog.vec.Mat4.AnyType} mat The transformation matrix.
+ * @param {goog.vec.Vec3.AnyType} translation The vector for storing the
+ *     result.
+ * @return {goog.vec.Mat4.AnyType} return mat so that operations can be
+ *     chained.
+ */
+goog.vec.Mat4.getTranslation = function(mat, translation) {
+  translation[0] = mat[12];
+  translation[1] = mat[13];
+  translation[2] = mat[14];
+  return translation;
+};
+
+
+/**
+ * @type {!Array<!goog.vec.Vec3.Type>}
+ * @private
+ */
+goog.vec.Mat4.tmpVec3_ = [
+  goog.vec.Vec3.createFloat64(),
+  goog.vec.Vec3.createFloat64()
+];
+
+
+/**
+ * @type {!Array<!goog.vec.Vec4.Type>}
+ * @private
+ */
+goog.vec.Mat4.tmpVec4_ = [
+  goog.vec.Vec4.createFloat64(),
+  goog.vec.Vec4.createFloat64(),
+  goog.vec.Vec4.createFloat64()
+];
+
+
+/**
+ * @type {!Array<!goog.vec.Mat4.Type>}
+ * @private
+ */
+goog.vec.Mat4.tmpMat4_ = [
+  goog.vec.Mat4.createFloat64()
+];
+
+goog.provide('ol.TransformFunction');
+
+
+/**
+ * A transform function accepts an array of input coordinate values, an optional
+ * output array, and an optional dimension (default should be 2).  The function
+ * transforms the input coordinate values, populates the output array, and
+ * returns the output array.
+ *
+ * @typedef {function(Array.<number>, Array.<number>=, number=): Array.<number>}
+ * @api stable
+ */
+ol.TransformFunction;
+
+goog.provide('ol.Extent');
+goog.provide('ol.extent');
+goog.provide('ol.extent.Corner');
+goog.provide('ol.extent.Relationship');
+
+goog.require('goog.asserts');
+goog.require('goog.vec.Mat4');
+goog.require('ol.Coordinate');
+goog.require('ol.Size');
+goog.require('ol.TransformFunction');
+
+
+/**
+ * An array of numbers representing an extent: `[minx, miny, maxx, maxy]`.
+ * @typedef {Array.<number>}
+ * @api stable
+ */
+ol.Extent;
+
+
+/**
+ * Extent corner.
+ * @enum {string}
+ */
+ol.extent.Corner = {
+  BOTTOM_LEFT: 'bottom-left',
+  BOTTOM_RIGHT: 'bottom-right',
+  TOP_LEFT: 'top-left',
+  TOP_RIGHT: 'top-right'
+};
+
+
+/**
+ * Relationship to an extent.
+ * @enum {number}
+ */
+ol.extent.Relationship = {
+  UNKNOWN: 0,
+  INTERSECTING: 1,
+  ABOVE: 2,
+  RIGHT: 4,
+  BELOW: 8,
+  LEFT: 16
+};
+
+
+/**
+ * Build an extent that includes all given coordinates.
+ *
+ * @param {Array.<ol.Coordinate>} coordinates Coordinates.
+ * @return {ol.Extent} Bounding extent.
+ * @api stable
+ */
+ol.extent.boundingExtent = function(coordinates) {
+  var extent = ol.extent.createEmpty();
+  for (var i = 0, ii = coordinates.length; i < ii; ++i) {
+    ol.extent.extendCoordinate(extent, coordinates[i]);
+  }
+  return extent;
+};
+
+
+/**
+ * @param {Array.<number>} xs Xs.
+ * @param {Array.<number>} ys Ys.
+ * @param {ol.Extent=} opt_extent Destination extent.
+ * @private
+ * @return {ol.Extent} Extent.
+ */
+ol.extent.boundingExtentXYs_ = function(xs, ys, opt_extent) {
+  goog.asserts.assert(xs.length > 0, 'xs length should be larger than 0');
+  goog.asserts.assert(ys.length > 0, 'ys length should be larger than 0');
+  var minX = Math.min.apply(null, xs);
+  var minY = Math.min.apply(null, ys);
+  var maxX = Math.max.apply(null, xs);
+  var maxY = Math.max.apply(null, ys);
+  return ol.extent.createOrUpdate(minX, minY, maxX, maxY, opt_extent);
+};
+
+
+/**
+ * Return extent increased by the provided value.
+ * @param {ol.Extent} extent Extent.
+ * @param {number} value The amount by which the extent should be buffered.
+ * @param {ol.Extent=} opt_extent Extent.
+ * @return {ol.Extent} Extent.
+ * @api stable
+ */
+ol.extent.buffer = function(extent, value, opt_extent) {
+  if (opt_extent) {
+    opt_extent[0] = extent[0] - value;
+    opt_extent[1] = extent[1] - value;
+    opt_extent[2] = extent[2] + value;
+    opt_extent[3] = extent[3] + value;
+    return opt_extent;
+  } else {
+    return [
+      extent[0] - value,
+      extent[1] - value,
+      extent[2] + value,
+      extent[3] + value
+    ];
+  }
+};
+
+
+/**
+ * Creates a clone of an extent.
+ *
+ * @param {ol.Extent} extent Extent to clone.
+ * @param {ol.Extent=} opt_extent Extent.
+ * @return {ol.Extent} The clone.
+ */
+ol.extent.clone = function(extent, opt_extent) {
+  if (opt_extent) {
+    opt_extent[0] = extent[0];
+    opt_extent[1] = extent[1];
+    opt_extent[2] = extent[2];
+    opt_extent[3] = extent[3];
+    return opt_extent;
+  } else {
+    return extent.slice();
+  }
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {number} x X.
+ * @param {number} y Y.
+ * @return {number} Closest squared distance.
+ */
+ol.extent.closestSquaredDistanceXY = function(extent, x, y) {
+  var dx, dy;
+  if (x < extent[0]) {
+    dx = extent[0] - x;
+  } else if (extent[2] < x) {
+    dx = x - extent[2];
+  } else {
+    dx = 0;
+  }
+  if (y < extent[1]) {
+    dy = extent[1] - y;
+  } else if (extent[3] < y) {
+    dy = y - extent[3];
+  } else {
+    dy = 0;
+  }
+  return dx * dx + dy * dy;
+};
+
+
+/**
+ * Check if the passed coordinate is contained or on the edge of the extent.
+ *
+ * @param {ol.Extent} extent Extent.
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @return {boolean} The coordinate is contained in the extent.
+ * @api stable
+ */
+ol.extent.containsCoordinate = function(extent, coordinate) {
+  return ol.extent.containsXY(extent, coordinate[0], coordinate[1]);
+};
+
+
+/**
+ * Check if one extent contains another.
+ *
+ * An extent is deemed contained if it lies completely within the other extent,
+ * including if they share one or more edges.
+ *
+ * @param {ol.Extent} extent1 Extent 1.
+ * @param {ol.Extent} extent2 Extent 2.
+ * @return {boolean} The second extent is contained by or on the edge of the
+ *     first.
+ * @api stable
+ */
+ol.extent.containsExtent = function(extent1, extent2) {
+  return extent1[0] <= extent2[0] && extent2[2] <= extent1[2] &&
+      extent1[1] <= extent2[1] && extent2[3] <= extent1[3];
+};
+
+
+/**
+ * Check if the passed coordinate is contained or on the edge of the extent.
+ *
+ * @param {ol.Extent} extent Extent.
+ * @param {number} x X coordinate.
+ * @param {number} y Y coordinate.
+ * @return {boolean} The x, y values are contained in the extent.
+ * @api stable
+ */
+ol.extent.containsXY = function(extent, x, y) {
+  return extent[0] <= x && x <= extent[2] && extent[1] <= y && y <= extent[3];
+};
+
+
+/**
+ * Get the relationship between a coordinate and extent.
+ * @param {ol.Extent} extent The extent.
+ * @param {ol.Coordinate} coordinate The coordinate.
+ * @return {number} The relationship (bitwise compare with
+ *     ol.extent.Relationship).
+ */
+ol.extent.coordinateRelationship = function(extent, coordinate) {
+  var minX = extent[0];
+  var minY = extent[1];
+  var maxX = extent[2];
+  var maxY = extent[3];
+  var x = coordinate[0];
+  var y = coordinate[1];
+  var relationship = ol.extent.Relationship.UNKNOWN;
+  if (x < minX) {
+    relationship = relationship | ol.extent.Relationship.LEFT;
+  } else if (x > maxX) {
+    relationship = relationship | ol.extent.Relationship.RIGHT;
+  }
+  if (y < minY) {
+    relationship = relationship | ol.extent.Relationship.BELOW;
+  } else if (y > maxY) {
+    relationship = relationship | ol.extent.Relationship.ABOVE;
+  }
+  if (relationship === ol.extent.Relationship.UNKNOWN) {
+    relationship = ol.extent.Relationship.INTERSECTING;
+  }
+  return relationship;
+};
+
+
+/**
+ * Create an empty extent.
+ * @return {ol.Extent} Empty extent.
+ * @api stable
+ */
+ol.extent.createEmpty = function() {
+  return [Infinity, Infinity, -Infinity, -Infinity];
+};
+
+
+/**
+ * Create a new extent or update the provided extent.
+ * @param {number} minX Minimum X.
+ * @param {number} minY Minimum Y.
+ * @param {number} maxX Maximum X.
+ * @param {number} maxY Maximum Y.
+ * @param {ol.Extent=} opt_extent Destination extent.
+ * @return {ol.Extent} Extent.
+ */
+ol.extent.createOrUpdate = function(minX, minY, maxX, maxY, opt_extent) {
+  if (opt_extent) {
+    opt_extent[0] = minX;
+    opt_extent[1] = minY;
+    opt_extent[2] = maxX;
+    opt_extent[3] = maxY;
+    return opt_extent;
+  } else {
+    return [minX, minY, maxX, maxY];
+  }
+};
+
+
+/**
+ * Create a new empty extent or make the provided one empty.
+ * @param {ol.Extent=} opt_extent Extent.
+ * @return {ol.Extent} Extent.
+ */
+ol.extent.createOrUpdateEmpty = function(opt_extent) {
+  return ol.extent.createOrUpdate(
+      Infinity, Infinity, -Infinity, -Infinity, opt_extent);
+};
+
+
+/**
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {ol.Extent=} opt_extent Extent.
+ * @return {ol.Extent} Extent.
+ */
+ol.extent.createOrUpdateFromCoordinate = function(coordinate, opt_extent) {
+  var x = coordinate[0];
+  var y = coordinate[1];
+  return ol.extent.createOrUpdate(x, y, x, y, opt_extent);
+};
+
+
+/**
+ * @param {Array.<ol.Coordinate>} coordinates Coordinates.
+ * @param {ol.Extent=} opt_extent Extent.
+ * @return {ol.Extent} Extent.
+ */
+ol.extent.createOrUpdateFromCoordinates = function(coordinates, opt_extent) {
+  var extent = ol.extent.createOrUpdateEmpty(opt_extent);
+  return ol.extent.extendCoordinates(extent, coordinates);
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {ol.Extent=} opt_extent Extent.
+ * @return {ol.Extent} Extent.
+ */
+ol.extent.createOrUpdateFromFlatCoordinates =
+    function(flatCoordinates, offset, end, stride, opt_extent) {
+  var extent = ol.extent.createOrUpdateEmpty(opt_extent);
+  return ol.extent.extendFlatCoordinates(
+      extent, flatCoordinates, offset, end, stride);
+};
+
+
+/**
+ * @param {Array.<Array.<ol.Coordinate>>} rings Rings.
+ * @param {ol.Extent=} opt_extent Extent.
+ * @return {ol.Extent} Extent.
+ */
+ol.extent.createOrUpdateFromRings = function(rings, opt_extent) {
+  var extent = ol.extent.createOrUpdateEmpty(opt_extent);
+  return ol.extent.extendRings(extent, rings);
+};
+
+
+/**
+ * Empty an extent in place.
+ * @param {ol.Extent} extent Extent.
+ * @return {ol.Extent} Extent.
+ */
+ol.extent.empty = function(extent) {
+  extent[0] = extent[1] = Infinity;
+  extent[2] = extent[3] = -Infinity;
+  return extent;
+};
+
+
+/**
+ * Determine if two extents are equivalent.
+ * @param {ol.Extent} extent1 Extent 1.
+ * @param {ol.Extent} extent2 Extent 2.
+ * @return {boolean} The two extents are equivalent.
+ * @api stable
+ */
+ol.extent.equals = function(extent1, extent2) {
+  return extent1[0] == extent2[0] && extent1[2] == extent2[2] &&
+      extent1[1] == extent2[1] && extent1[3] == extent2[3];
+};
+
+
+/**
+ * Modify an extent to include another extent.
+ * @param {ol.Extent} extent1 The extent to be modified.
+ * @param {ol.Extent} extent2 The extent that will be included in the first.
+ * @return {ol.Extent} A reference to the first (extended) extent.
+ * @api stable
+ */
+ol.extent.extend = function(extent1, extent2) {
+  if (extent2[0] < extent1[0]) {
+    extent1[0] = extent2[0];
+  }
+  if (extent2[2] > extent1[2]) {
+    extent1[2] = extent2[2];
+  }
+  if (extent2[1] < extent1[1]) {
+    extent1[1] = extent2[1];
+  }
+  if (extent2[3] > extent1[3]) {
+    extent1[3] = extent2[3];
+  }
+  return extent1;
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {ol.Coordinate} coordinate Coordinate.
+ */
+ol.extent.extendCoordinate = function(extent, coordinate) {
+  if (coordinate[0] < extent[0]) {
+    extent[0] = coordinate[0];
+  }
+  if (coordinate[0] > extent[2]) {
+    extent[2] = coordinate[0];
+  }
+  if (coordinate[1] < extent[1]) {
+    extent[1] = coordinate[1];
+  }
+  if (coordinate[1] > extent[3]) {
+    extent[3] = coordinate[1];
+  }
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {Array.<ol.Coordinate>} coordinates Coordinates.
+ * @return {ol.Extent} Extent.
+ */
+ol.extent.extendCoordinates = function(extent, coordinates) {
+  var i, ii;
+  for (i = 0, ii = coordinates.length; i < ii; ++i) {
+    ol.extent.extendCoordinate(extent, coordinates[i]);
+  }
+  return extent;
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @return {ol.Extent} Extent.
+ */
+ol.extent.extendFlatCoordinates =
+    function(extent, flatCoordinates, offset, end, stride) {
+  for (; offset < end; offset += stride) {
+    ol.extent.extendXY(
+        extent, flatCoordinates[offset], flatCoordinates[offset + 1]);
+  }
+  return extent;
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {Array.<Array.<ol.Coordinate>>} rings Rings.
+ * @return {ol.Extent} Extent.
+ */
+ol.extent.extendRings = function(extent, rings) {
+  var i, ii;
+  for (i = 0, ii = rings.length; i < ii; ++i) {
+    ol.extent.extendCoordinates(extent, rings[i]);
+  }
+  return extent;
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {number} x X.
+ * @param {number} y Y.
+ */
+ol.extent.extendXY = function(extent, x, y) {
+  extent[0] = Math.min(extent[0], x);
+  extent[1] = Math.min(extent[1], y);
+  extent[2] = Math.max(extent[2], x);
+  extent[3] = Math.max(extent[3], y);
+};
+
+
+/**
+ * This function calls `callback` for each corner of the extent. If the
+ * callback returns a truthy value the function returns that value
+ * immediately. Otherwise the function returns `false`.
+ * @param {ol.Extent} extent Extent.
+ * @param {function(this:T, ol.Coordinate): S} callback Callback.
+ * @param {T=} opt_this Value to use as `this` when executing `callback`.
+ * @return {S|boolean} Value.
+ * @template S, T
+ */
+ol.extent.forEachCorner = function(extent, callback, opt_this) {
+  var val;
+  val = callback.call(opt_this, ol.extent.getBottomLeft(extent));
+  if (val) {
+    return val;
+  }
+  val = callback.call(opt_this, ol.extent.getBottomRight(extent));
+  if (val) {
+    return val;
+  }
+  val = callback.call(opt_this, ol.extent.getTopRight(extent));
+  if (val) {
+    return val;
+  }
+  val = callback.call(opt_this, ol.extent.getTopLeft(extent));
+  if (val) {
+    return val;
+  }
+  return false;
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @return {number} Area.
+ */
+ol.extent.getArea = function(extent) {
+  var area = 0;
+  if (!ol.extent.isEmpty(extent)) {
+    area = ol.extent.getWidth(extent) * ol.extent.getHeight(extent);
+  }
+  return area;
+};
+
+
+/**
+ * Get the bottom left coordinate of an extent.
+ * @param {ol.Extent} extent Extent.
+ * @return {ol.Coordinate} Bottom left coordinate.
+ * @api stable
+ */
+ol.extent.getBottomLeft = function(extent) {
+  return [extent[0], extent[1]];
+};
+
+
+/**
+ * Get the bottom right coordinate of an extent.
+ * @param {ol.Extent} extent Extent.
+ * @return {ol.Coordinate} Bottom right coordinate.
+ * @api stable
+ */
+ol.extent.getBottomRight = function(extent) {
+  return [extent[2], extent[1]];
+};
+
+
+/**
+ * Get the center coordinate of an extent.
+ * @param {ol.Extent} extent Extent.
+ * @return {ol.Coordinate} Center.
+ * @api stable
+ */
+ol.extent.getCenter = function(extent) {
+  return [(extent[0] + extent[2]) / 2, (extent[1] + extent[3]) / 2];
+};
+
+
+/**
+ * Get a corner coordinate of an extent.
+ * @param {ol.Extent} extent Extent.
+ * @param {ol.extent.Corner} corner Corner.
+ * @return {ol.Coordinate} Corner coordinate.
+ */
+ol.extent.getCorner = function(extent, corner) {
+  var coordinate;
+  if (corner === ol.extent.Corner.BOTTOM_LEFT) {
+    coordinate = ol.extent.getBottomLeft(extent);
+  } else if (corner === ol.extent.Corner.BOTTOM_RIGHT) {
+    coordinate = ol.extent.getBottomRight(extent);
+  } else if (corner === ol.extent.Corner.TOP_LEFT) {
+    coordinate = ol.extent.getTopLeft(extent);
+  } else if (corner === ol.extent.Corner.TOP_RIGHT) {
+    coordinate = ol.extent.getTopRight(extent);
+  } else {
+    goog.asserts.fail('Invalid corner: %s', corner);
+  }
+  goog.asserts.assert(coordinate, 'coordinate should be defined');
+  return coordinate;
+};
+
+
+/**
+ * @param {ol.Extent} extent1 Extent 1.
+ * @param {ol.Extent} extent2 Extent 2.
+ * @return {number} Enlarged area.
+ */
+ol.extent.getEnlargedArea = function(extent1, extent2) {
+  var minX = Math.min(extent1[0], extent2[0]);
+  var minY = Math.min(extent1[1], extent2[1]);
+  var maxX = Math.max(extent1[2], extent2[2]);
+  var maxY = Math.max(extent1[3], extent2[3]);
+  return (maxX - minX) * (maxY - minY);
+};
+
+
+/**
+ * @param {ol.Coordinate} center Center.
+ * @param {number} resolution Resolution.
+ * @param {number} rotation Rotation.
+ * @param {ol.Size} size Size.
+ * @param {ol.Extent=} opt_extent Destination extent.
+ * @return {ol.Extent} Extent.
+ */
+ol.extent.getForViewAndSize =
+    function(center, resolution, rotation, size, opt_extent) {
+  var dx = resolution * size[0] / 2;
+  var dy = resolution * size[1] / 2;
+  var cosRotation = Math.cos(rotation);
+  var sinRotation = Math.sin(rotation);
+  /** @type {Array.<number>} */
+  var xs = [-dx, -dx, dx, dx];
+  /** @type {Array.<number>} */
+  var ys = [-dy, dy, -dy, dy];
+  var i, x, y;
+  for (i = 0; i < 4; ++i) {
+    x = xs[i];
+    y = ys[i];
+    xs[i] = center[0] + x * cosRotation - y * sinRotation;
+    ys[i] = center[1] + x * sinRotation + y * cosRotation;
+  }
+  return ol.extent.boundingExtentXYs_(xs, ys, opt_extent);
+};
+
+
+/**
+ * Get the height of an extent.
+ * @param {ol.Extent} extent Extent.
+ * @return {number} Height.
+ * @api stable
+ */
+ol.extent.getHeight = function(extent) {
+  return extent[3] - extent[1];
+};
+
+
+/**
+ * @param {ol.Extent} extent1 Extent 1.
+ * @param {ol.Extent} extent2 Extent 2.
+ * @return {number} Intersection area.
+ */
+ol.extent.getIntersectionArea = function(extent1, extent2) {
+  var intersection = ol.extent.getIntersection(extent1, extent2);
+  return ol.extent.getArea(intersection);
+};
+
+
+/**
+ * Get the intersection of two extents.
+ * @param {ol.Extent} extent1 Extent 1.
+ * @param {ol.Extent} extent2 Extent 2.
+ * @param {ol.Extent=} opt_extent Optional extent to populate with intersection.
+ * @return {ol.Extent} Intersecting extent.
+ * @api stable
+ */
+ol.extent.getIntersection = function(extent1, extent2, opt_extent) {
+  var intersection = opt_extent ? opt_extent : ol.extent.createEmpty();
+  if (ol.extent.intersects(extent1, extent2)) {
+    if (extent1[0] > extent2[0]) {
+      intersection[0] = extent1[0];
+    } else {
+      intersection[0] = extent2[0];
+    }
+    if (extent1[1] > extent2[1]) {
+      intersection[1] = extent1[1];
+    } else {
+      intersection[1] = extent2[1];
+    }
+    if (extent1[2] < extent2[2]) {
+      intersection[2] = extent1[2];
+    } else {
+      intersection[2] = extent2[2];
+    }
+    if (extent1[3] < extent2[3]) {
+      intersection[3] = extent1[3];
+    } else {
+      intersection[3] = extent2[3];
+    }
+  }
+  return intersection;
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @return {number} Margin.
+ */
+ol.extent.getMargin = function(extent) {
+  return ol.extent.getWidth(extent) + ol.extent.getHeight(extent);
+};
+
+
+/**
+ * Get the size (width, height) of an extent.
+ * @param {ol.Extent} extent The extent.
+ * @return {ol.Size} The extent size.
+ * @api stable
+ */
+ol.extent.getSize = function(extent) {
+  return [extent[2] - extent[0], extent[3] - extent[1]];
+};
+
+
+/**
+ * Get the top left coordinate of an extent.
+ * @param {ol.Extent} extent Extent.
+ * @return {ol.Coordinate} Top left coordinate.
+ * @api stable
+ */
+ol.extent.getTopLeft = function(extent) {
+  return [extent[0], extent[3]];
+};
+
+
+/**
+ * Get the top right coordinate of an extent.
+ * @param {ol.Extent} extent Extent.
+ * @return {ol.Coordinate} Top right coordinate.
+ * @api stable
+ */
+ol.extent.getTopRight = function(extent) {
+  return [extent[2], extent[3]];
+};
+
+
+/**
+ * Get the width of an extent.
+ * @param {ol.Extent} extent Extent.
+ * @return {number} Width.
+ * @api stable
+ */
+ol.extent.getWidth = function(extent) {
+  return extent[2] - extent[0];
+};
+
+
+/**
+ * Determine if one extent intersects another.
+ * @param {ol.Extent} extent1 Extent 1.
+ * @param {ol.Extent} extent2 Extent.
+ * @return {boolean} The two extents intersect.
+ * @api stable
+ */
+ol.extent.intersects = function(extent1, extent2) {
+  return extent1[0] <= extent2[2] &&
+      extent1[2] >= extent2[0] &&
+      extent1[1] <= extent2[3] &&
+      extent1[3] >= extent2[1];
+};
+
+
+/**
+ * Determine if an extent is empty.
+ * @param {ol.Extent} extent Extent.
+ * @return {boolean} Is empty.
+ * @api stable
+ */
+ol.extent.isEmpty = function(extent) {
+  return extent[2] < extent[0] || extent[3] < extent[1];
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @return {boolean} Is infinite.
+ */
+ol.extent.isInfinite = function(extent) {
+  return extent[0] == -Infinity || extent[1] == -Infinity ||
+      extent[2] == Infinity || extent[3] == Infinity;
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @return {ol.Coordinate} Coordinate.
+ */
+ol.extent.normalize = function(extent, coordinate) {
+  return [
+    (coordinate[0] - extent[0]) / (extent[2] - extent[0]),
+    (coordinate[1] - extent[1]) / (extent[3] - extent[1])
+  ];
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {ol.Extent=} opt_extent Extent.
+ * @return {ol.Extent} Extent.
+ */
+ol.extent.returnOrUpdate = function(extent, opt_extent) {
+  if (opt_extent) {
+    opt_extent[0] = extent[0];
+    opt_extent[1] = extent[1];
+    opt_extent[2] = extent[2];
+    opt_extent[3] = extent[3];
+    return opt_extent;
+  } else {
+    return extent;
+  }
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {number} value Value.
+ */
+ol.extent.scaleFromCenter = function(extent, value) {
+  var deltaX = ((extent[2] - extent[0]) / 2) * (value - 1);
+  var deltaY = ((extent[3] - extent[1]) / 2) * (value - 1);
+  extent[0] -= deltaX;
+  extent[2] += deltaX;
+  extent[1] -= deltaY;
+  extent[3] += deltaY;
+};
+
+
+/**
+ * Determine if the segment between two coordinates intersects (crosses,
+ * touches, or is contained by) the provided extent.
+ * @param {ol.Extent} extent The extent.
+ * @param {ol.Coordinate} start Segment start coordinate.
+ * @param {ol.Coordinate} end Segment end coordinate.
+ * @return {boolean} The segment intersects the extent.
+ */
+ol.extent.intersectsSegment = function(extent, start, end) {
+  var intersects = false;
+  var startRel = ol.extent.coordinateRelationship(extent, start);
+  var endRel = ol.extent.coordinateRelationship(extent, end);
+  if (startRel === ol.extent.Relationship.INTERSECTING ||
+      endRel === ol.extent.Relationship.INTERSECTING) {
+    intersects = true;
+  } else {
+    var minX = extent[0];
+    var minY = extent[1];
+    var maxX = extent[2];
+    var maxY = extent[3];
+    var startX = start[0];
+    var startY = start[1];
+    var endX = end[0];
+    var endY = end[1];
+    var slope = (endY - startY) / (endX - startX);
+    var x, y;
+    if (!!(endRel & ol.extent.Relationship.ABOVE) &&
+        !(startRel & ol.extent.Relationship.ABOVE)) {
+      // potentially intersects top
+      x = endX - ((endY - maxY) / slope);
+      intersects = x >= minX && x <= maxX;
+    }
+    if (!intersects && !!(endRel & ol.extent.Relationship.RIGHT) &&
+        !(startRel & ol.extent.Relationship.RIGHT)) {
+      // potentially intersects right
+      y = endY - ((endX - maxX) * slope);
+      intersects = y >= minY && y <= maxY;
+    }
+    if (!intersects && !!(endRel & ol.extent.Relationship.BELOW) &&
+        !(startRel & ol.extent.Relationship.BELOW)) {
+      // potentially intersects bottom
+      x = endX - ((endY - minY) / slope);
+      intersects = x >= minX && x <= maxX;
+    }
+    if (!intersects && !!(endRel & ol.extent.Relationship.LEFT) &&
+        !(startRel & ol.extent.Relationship.LEFT)) {
+      // potentially intersects left
+      y = endY - ((endX - minX) * slope);
+      intersects = y >= minY && y <= maxY;
+    }
+
+  }
+  return intersects;
+};
+
+
+/**
+ * @param {ol.Extent} extent1 Extent 1.
+ * @param {ol.Extent} extent2 Extent 2.
+ * @return {boolean} Touches.
+ */
+ol.extent.touches = function(extent1, extent2) {
+  var intersects = ol.extent.intersects(extent1, extent2);
+  return intersects &&
+      (extent1[0] == extent2[2] || extent1[2] == extent2[0] ||
+       extent1[1] == extent2[3] || extent1[3] == extent2[1]);
+};
+
+
+/**
+ * Apply a transform function to the extent.
+ * @param {ol.Extent} extent Extent.
+ * @param {ol.TransformFunction} transformFn Transform function.  Called with
+ * [minX, minY, maxX, maxY] extent coordinates.
+ * @param {ol.Extent=} opt_extent Destination extent.
+ * @return {ol.Extent} Extent.
+ * @api stable
+ */
+ol.extent.applyTransform = function(extent, transformFn, opt_extent) {
+  var coordinates = [
+    extent[0], extent[1],
+    extent[0], extent[3],
+    extent[2], extent[1],
+    extent[2], extent[3]
+  ];
+  transformFn(coordinates, coordinates, 2);
+  var xs = [coordinates[0], coordinates[2], coordinates[4], coordinates[6]];
+  var ys = [coordinates[1], coordinates[3], coordinates[5], coordinates[7]];
+  return ol.extent.boundingExtentXYs_(xs, ys, opt_extent);
+};
+
+
+/**
+ * Apply a 2d transform to an extent.
+ * @param {ol.Extent} extent Input extent.
+ * @param {goog.vec.Mat4.Number} transform The transform matrix.
+ * @param {ol.Extent=} opt_extent Optional extent for return values.
+ * @return {ol.Extent} The transformed extent.
+ */
+ol.extent.transform2D = function(extent, transform, opt_extent) {
+  var dest = opt_extent ? opt_extent : [];
+  var m00 = goog.vec.Mat4.getElement(transform, 0, 0);
+  var m10 = goog.vec.Mat4.getElement(transform, 1, 0);
+  var m01 = goog.vec.Mat4.getElement(transform, 0, 1);
+  var m11 = goog.vec.Mat4.getElement(transform, 1, 1);
+  var m03 = goog.vec.Mat4.getElement(transform, 0, 3);
+  var m13 = goog.vec.Mat4.getElement(transform, 1, 3);
+  var xi = [0, 2, 0, 2];
+  var yi = [1, 1, 3, 3];
+  var xs = [];
+  var ys = [];
+  var i, x, y;
+  for (i = 0; i < 4; ++i) {
+    x = extent[xi[i]];
+    y = extent[yi[i]];
+    xs[i] = m00 * x + m01 * y + m03;
+    ys[i] = m10 * x + m11 * y + m13;
+  }
+  dest[0] = Math.min.apply(null, xs);
+  dest[1] = Math.min.apply(null, ys);
+  dest[2] = Math.max.apply(null, xs);
+  dest[3] = Math.max.apply(null, ys);
+  return dest;
+};
+
+// Copyright 2008 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Utilities for creating functions. Loosely inspired by the
+ * java classes: http://goo.gl/GM0Hmu and http://goo.gl/6k7nI8.
+ *
+ * @author nicksantos@google.com (Nick Santos)
+ */
+
+
+goog.provide('goog.functions');
+
+
+/**
+ * Creates a function that always returns the same value.
+ * @param {T} retValue The value to return.
+ * @return {function():T} The new function.
+ * @template T
+ */
+goog.functions.constant = function(retValue) {
+  return function() {
+    return retValue;
+  };
+};
+
+
+/**
+ * Always returns false.
+ * @type {function(...): boolean}
+ */
+goog.functions.FALSE = goog.functions.constant(false);
+
+
+/**
+ * Always returns true.
+ * @type {function(...): boolean}
+ */
+goog.functions.TRUE = goog.functions.constant(true);
+
+
+/**
+ * Always returns NULL.
+ * @type {function(...): null}
+ */
+goog.functions.NULL = goog.functions.constant(null);
+
+
+/**
+ * A simple function that returns the first argument of whatever is passed
+ * into it.
+ * @param {T=} opt_returnValue The single value that will be returned.
+ * @param {...*} var_args Optional trailing arguments. These are ignored.
+ * @return {T} The first argument passed in, or undefined if nothing was passed.
+ * @template T
+ */
+goog.functions.identity = function(opt_returnValue, var_args) {
+  return opt_returnValue;
+};
+
+
+/**
+ * Creates a function that always throws an error with the given message.
+ * @param {string} message The error message.
+ * @return {!Function} The error-throwing function.
+ */
+goog.functions.error = function(message) {
+  return function() {
+    throw Error(message);
+  };
+};
+
+
+/**
+ * Creates a function that throws the given object.
+ * @param {*} err An object to be thrown.
+ * @return {!Function} The error-throwing function.
+ */
+goog.functions.fail = function(err) {
+  return function() {
+    throw err;
+  }
+};
+
+
+/**
+ * Given a function, create a function that keeps opt_numArgs arguments and
+ * silently discards all additional arguments.
+ * @param {Function} f The original function.
+ * @param {number=} opt_numArgs The number of arguments to keep. Defaults to 0.
+ * @return {!Function} A version of f that only keeps the first opt_numArgs
+ *     arguments.
+ */
+goog.functions.lock = function(f, opt_numArgs) {
+  opt_numArgs = opt_numArgs || 0;
+  return function() {
+    return f.apply(this, Array.prototype.slice.call(arguments, 0, opt_numArgs));
+  };
+};
+
+
+/**
+ * Creates a function that returns its nth argument.
+ * @param {number} n The position of the return argument.
+ * @return {!Function} A new function.
+ */
+goog.functions.nth = function(n) {
+  return function() {
+    return arguments[n];
+  };
+};
+
+
+/**
+ * Given a function, create a new function that swallows its return value
+ * and replaces it with a new one.
+ * @param {Function} f A function.
+ * @param {T} retValue A new return value.
+ * @return {function(...?):T} A new function.
+ * @template T
+ */
+goog.functions.withReturnValue = function(f, retValue) {
+  return goog.functions.sequence(f, goog.functions.constant(retValue));
+};
+
+
+/**
+ * Creates a function that returns whether its arguement equals the given value.
+ *
+ * Example:
+ * var key = goog.object.findKey(obj, goog.functions.equalTo('needle'));
+ *
+ * @param {*} value The value to compare to.
+ * @param {boolean=} opt_useLooseComparison Whether to use a loose (==)
+ *     comparison rather than a strict (===) one. Defaults to false.
+ * @return {function(*):boolean} The new function.
+ */
+goog.functions.equalTo = function(value, opt_useLooseComparison) {
+  return function(other) {
+    return opt_useLooseComparison ? (value == other) : (value === other);
+  };
+};
+
+
+/**
+ * Creates the composition of the functions passed in.
+ * For example, (goog.functions.compose(f, g))(a) is equivalent to f(g(a)).
+ * @param {function(...?):T} fn The final function.
+ * @param {...Function} var_args A list of functions.
+ * @return {function(...?):T} The composition of all inputs.
+ * @template T
+ */
+goog.functions.compose = function(fn, var_args) {
+  var functions = arguments;
+  var length = functions.length;
+  return function() {
+    var result;
+    if (length) {
+      result = functions[length - 1].apply(this, arguments);
+    }
+
+    for (var i = length - 2; i >= 0; i--) {
+      result = functions[i].call(this, result);
+    }
+    return result;
+  };
+};
+
+
+/**
+ * Creates a function that calls the functions passed in in sequence, and
+ * returns the value of the last function. For example,
+ * (goog.functions.sequence(f, g))(x) is equivalent to f(x),g(x).
+ * @param {...Function} var_args A list of functions.
+ * @return {!Function} A function that calls all inputs in sequence.
+ */
+goog.functions.sequence = function(var_args) {
+  var functions = arguments;
+  var length = functions.length;
+  return function() {
+    var result;
+    for (var i = 0; i < length; i++) {
+      result = functions[i].apply(this, arguments);
+    }
+    return result;
+  };
+};
+
+
+/**
+ * Creates a function that returns true if each of its components evaluates
+ * to true. The components are evaluated in order, and the evaluation will be
+ * short-circuited as soon as a function returns false.
+ * For example, (goog.functions.and(f, g))(x) is equivalent to f(x) && g(x).
+ * @param {...Function} var_args A list of functions.
+ * @return {function(...?):boolean} A function that ANDs its component
+ *      functions.
+ */
+goog.functions.and = function(var_args) {
+  var functions = arguments;
+  var length = functions.length;
+  return function() {
+    for (var i = 0; i < length; i++) {
+      if (!functions[i].apply(this, arguments)) {
+        return false;
+      }
+    }
+    return true;
+  };
+};
+
+
+/**
+ * Creates a function that returns true if any of its components evaluates
+ * to true. The components are evaluated in order, and the evaluation will be
+ * short-circuited as soon as a function returns true.
+ * For example, (goog.functions.or(f, g))(x) is equivalent to f(x) || g(x).
+ * @param {...Function} var_args A list of functions.
+ * @return {function(...?):boolean} A function that ORs its component
+ *    functions.
+ */
+goog.functions.or = function(var_args) {
+  var functions = arguments;
+  var length = functions.length;
+  return function() {
+    for (var i = 0; i < length; i++) {
+      if (functions[i].apply(this, arguments)) {
+        return true;
+      }
+    }
+    return false;
+  };
+};
+
+
+/**
+ * Creates a function that returns the Boolean opposite of a provided function.
+ * For example, (goog.functions.not(f))(x) is equivalent to !f(x).
+ * @param {!Function} f The original function.
+ * @return {function(...?):boolean} A function that delegates to f and returns
+ * opposite.
+ */
+goog.functions.not = function(f) {
+  return function() {
+    return !f.apply(this, arguments);
+  };
+};
+
+
+/**
+ * Generic factory function to construct an object given the constructor
+ * and the arguments. Intended to be bound to create object factories.
+ *
+ * Example:
+ *
+ * var factory = goog.partial(goog.functions.create, Class);
+ *
+ * @param {function(new:T, ...)} constructor The constructor for the Object.
+ * @param {...*} var_args The arguments to be passed to the constructor.
+ * @return {T} A new instance of the class given in {@code constructor}.
+ * @template T
+ */
+goog.functions.create = function(constructor, var_args) {
+  /**
+   * @constructor
+   * @final
+   */
+  var temp = function() {};
+  temp.prototype = constructor.prototype;
+
+  // obj will have constructor's prototype in its chain and
+  // 'obj instanceof constructor' will be true.
+  var obj = new temp();
+
+  // obj is initialized by constructor.
+  // arguments is only array-like so lacks shift(), but can be used with
+  // the Array prototype function.
+  constructor.apply(obj, Array.prototype.slice.call(arguments, 1));
+  return obj;
+};
+
+
+/**
+ * @define {boolean} Whether the return value cache should be used.
+ *    This should only be used to disable caches when testing.
+ */
+goog.define('goog.functions.CACHE_RETURN_VALUE', true);
+
+
+/**
+ * Gives a wrapper function that caches the return value of a parameterless
+ * function when first called.
+ *
+ * When called for the first time, the given function is called and its
+ * return value is cached (thus this is only appropriate for idempotent
+ * functions).  Subsequent calls will return the cached return value. This
+ * allows the evaluation of expensive functions to be delayed until first used.
+ *
+ * To cache the return values of functions with parameters, see goog.memoize.
+ *
+ * @param {!function():T} fn A function to lazily evaluate.
+ * @return {!function():T} A wrapped version the function.
+ * @template T
+ */
+goog.functions.cacheReturnValue = function(fn) {
+  var called = false;
+  var value;
+
+  return function() {
+    if (!goog.functions.CACHE_RETURN_VALUE) {
+      return fn();
+    }
+
+    if (!called) {
+      value = fn();
+      called = true;
+    }
+
+    return value;
+  }
+};
+
+
+/**
+ * Wraps a function to allow it to be called, at most, once. All
+ * additional calls are no-ops.
+ *
+ * This is particularly useful for initialization functions
+ * that should be called, at most, once.
+ *
+ * @param {function():*} f Function to call.
+ * @return {function():undefined} Wrapped function.
+ */
+goog.functions.once = function(f) {
+  // Keep a reference to the function that we null out when we're done with
+  // it -- that way, the function can be GC'd when we're done with it.
+  var inner = f;
+  return function() {
+    if (inner) {
+      var tmp = inner;
+      inner = null;
+      tmp();
+    }
+  };
+};
+
+
+/**
+ * Wraps a function to allow it to be called, at most, once for each sequence of
+ * calls fired repeatedly so long as they are fired less than a specified
+ * interval apart (in milliseconds). Whether it receives one signal or multiple,
+ * it will always wait until a full interval has elapsed since the last signal
+ * before performing the action.
+ *
+ * This is particularly useful for bulking up repeated user actions (e.g. only
+ * refreshing a view once a user finishes typing rather than updating with every
+ * keystroke). For more stateful debouncing with support for pausing, resuming,
+ * and canceling debounced actions, use {@code goog.async.Debouncer}.
+ *
+ * @param {function(this:SCOPE):*} f Function to call.
+ * @param {number} interval Interval over which to debounce. The function will
+ *     only be called after the full interval has elapsed since the last call.
+ * @param {SCOPE=} opt_scope Object in whose scope to call the function.
+ * @return {function():undefined} Wrapped function.
+ * @template SCOPE
+ */
+goog.functions.debounce = function(f, interval, opt_scope) {
+  if (opt_scope) {
+    f = goog.bind(f, opt_scope);
+  }
+  var timeout = null;
+  return function() {
+    goog.global.clearTimeout(timeout);
+    timeout = goog.global.setTimeout(f, interval);
+  };
+};
+
+
+/**
+ * Wraps a function to allow it to be called, at most, once per interval
+ * (specified in milliseconds). If it is called multiple times while it is
+ * waiting, it will only perform the action once at the end of the interval.
+ *
+ * This is particularly useful for limiting repeated user requests (e.g.
+ * preventing a user from spamming a server with frequent view refreshes). For
+ * more stateful throttling with support for pausing, resuming, and canceling
+ * throttled actions, use {@code goog.async.Throttle}.
+ *
+ * @param {function(this:SCOPE):*} f Function to call.
+ * @param {number} interval Interval over which to throttle. The function can
+ *     only be called once per interval.
+ * @param {SCOPE=} opt_scope Object in whose scope to call the function.
+ * @return {function():undefined} Wrapped function.
+ * @template SCOPE
+ */
+goog.functions.throttle = function(f, interval, opt_scope) {
+  if (opt_scope) {
+    f = goog.bind(f, opt_scope);
+  }
+  var timeout = null;
+  var shouldFire = false;
+  var fire = function() {
+    timeout = goog.global.setTimeout(handleTimeout, interval);
+    f();
+  };
+  var handleTimeout = function() {
+    timeout = null;
+    if (shouldFire) {
+      shouldFire = false;
+      fire();
+    }
+  };
+
+  return function() {
+    if (!timeout) {
+      fire();
+    } else {
+      shouldFire = true;
+    }
+  };
+};
+
+/**
+ * @license
+ * Latitude/longitude spherical geodesy formulae taken from
+ * http://www.movable-type.co.uk/scripts/latlong.html
+ * Licensed under CC-BY-3.0.
+ */
+
+goog.provide('ol.Sphere');
+
+goog.require('ol.math');
+
+
+
+/**
+ * @classdesc
+ * Class to create objects that can be used with {@link
+ * ol.geom.Polygon.circular}.
+ *
+ * For example to create a sphere whose radius is equal to the semi-major
+ * axis of the WGS84 ellipsoid:
+ *
+ * ```js
+ * var wgs84Sphere= new ol.Sphere(6378137);
+ * ```
+ *
+ * @constructor
+ * @param {number} radius Radius.
+ * @api
+ */
+ol.Sphere = function(radius) {
+
+  /**
+   * @type {number}
+   */
+  this.radius = radius;
+
+};
+
+
+/**
+ * Returns the geodesic area for a list of coordinates.
+ *
+ * [Reference](http://trs-new.jpl.nasa.gov/dspace/handle/2014/40409)
+ * Robert. G. Chamberlain and William H. Duquette, "Some Algorithms for
+ * Polygons on a Sphere", JPL Publication 07-03, Jet Propulsion
+ * Laboratory, Pasadena, CA, June 2007
+ *
+ * @param {Array.<ol.Coordinate>} coordinates List of coordinates of a linear
+ * ring. If the ring is oriented clockwise, the area will be positive,
+ * otherwise it will be negative.
+ * @return {number} Area.
+ * @api
+ */
+ol.Sphere.prototype.geodesicArea = function(coordinates) {
+  var area = 0, len = coordinates.length;
+  var x1 = coordinates[len - 1][0];
+  var y1 = coordinates[len - 1][1];
+  for (var i = 0; i < len; i++) {
+    var x2 = coordinates[i][0], y2 = coordinates[i][1];
+    area += ol.math.toRadians(x2 - x1) *
+        (2 + Math.sin(ol.math.toRadians(y1)) +
+        Math.sin(ol.math.toRadians(y2)));
+    x1 = x2;
+    y1 = y2;
+  }
+  return area * this.radius * this.radius / 2.0;
+};
+
+
+/**
+ * Returns the distance from c1 to c2 using the haversine formula.
+ *
+ * @param {ol.Coordinate} c1 Coordinate 1.
+ * @param {ol.Coordinate} c2 Coordinate 2.
+ * @return {number} Haversine distance.
+ * @api
+ */
+ol.Sphere.prototype.haversineDistance = function(c1, c2) {
+  var lat1 = ol.math.toRadians(c1[1]);
+  var lat2 = ol.math.toRadians(c2[1]);
+  var deltaLatBy2 = (lat2 - lat1) / 2;
+  var deltaLonBy2 = ol.math.toRadians(c2[0] - c1[0]) / 2;
+  var a = Math.sin(deltaLatBy2) * Math.sin(deltaLatBy2) +
+      Math.sin(deltaLonBy2) * Math.sin(deltaLonBy2) *
+      Math.cos(lat1) * Math.cos(lat2);
+  return 2 * this.radius * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
+};
+
+
+/**
+ * Returns the coordinate at the given distance and bearing from `c1`.
+ *
+ * @param {ol.Coordinate} c1 The origin point (`[lon, lat]` in degrees).
+ * @param {number} distance The great-circle distance between the origin
+ *     point and the target point.
+ * @param {number} bearing The bearing (in radians).
+ * @return {ol.Coordinate} The target point.
+ */
+ol.Sphere.prototype.offset = function(c1, distance, bearing) {
+  var lat1 = ol.math.toRadians(c1[1]);
+  var lon1 = ol.math.toRadians(c1[0]);
+  var dByR = distance / this.radius;
+  var lat = Math.asin(
+      Math.sin(lat1) * Math.cos(dByR) +
+      Math.cos(lat1) * Math.sin(dByR) * Math.cos(bearing));
+  var lon = lon1 + Math.atan2(
+      Math.sin(bearing) * Math.sin(dByR) * Math.cos(lat1),
+      Math.cos(dByR) - Math.sin(lat1) * Math.sin(lat));
+  return [ol.math.toDegrees(lon), ol.math.toDegrees(lat)];
+};
+
+goog.provide('ol.sphere.NORMAL');
+
+goog.require('ol.Sphere');
+
+
+/**
+ * The normal sphere.
+ * @const
+ * @type {ol.Sphere}
+ */
+ol.sphere.NORMAL = new ol.Sphere(6370997);
+
+goog.provide('ol.proj');
+goog.provide('ol.proj.METERS_PER_UNIT');
+goog.provide('ol.proj.Projection');
+goog.provide('ol.proj.ProjectionLike');
+goog.provide('ol.proj.Units');
+
+goog.require('goog.asserts');
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.Extent');
+goog.require('ol.TransformFunction');
+goog.require('ol.extent');
+goog.require('ol.sphere.NORMAL');
+
+
+/**
+ * A projection as {@link ol.proj.Projection}, SRS identifier string or
+ * undefined.
+ * @typedef {ol.proj.Projection|string|undefined} ol.proj.ProjectionLike
+ * @api stable
+ */
+ol.proj.ProjectionLike;
+
+
+/**
+ * Projection units: `'degrees'`, `'ft'`, `'m'`, `'pixels'`, `'tile-pixels'` or
+ * `'us-ft'`.
+ * @enum {string}
+ * @api stable
+ */
+ol.proj.Units = {
+  DEGREES: 'degrees',
+  FEET: 'ft',
+  METERS: 'm',
+  PIXELS: 'pixels',
+  TILE_PIXELS: 'tile-pixels',
+  USFEET: 'us-ft'
+};
+
+
+/**
+ * Meters per unit lookup table.
+ * @const
+ * @type {Object.<ol.proj.Units, number>}
+ * @api stable
+ */
+ol.proj.METERS_PER_UNIT = {};
+ol.proj.METERS_PER_UNIT[ol.proj.Units.DEGREES] =
+    2 * Math.PI * ol.sphere.NORMAL.radius / 360;
+ol.proj.METERS_PER_UNIT[ol.proj.Units.FEET] = 0.3048;
+ol.proj.METERS_PER_UNIT[ol.proj.Units.METERS] = 1;
+ol.proj.METERS_PER_UNIT[ol.proj.Units.USFEET] = 1200 / 3937;
+
+
+
+/**
+ * @classdesc
+ * Projection definition class. One of these is created for each projection
+ * supported in the application and stored in the {@link ol.proj} namespace.
+ * You can use these in applications, but this is not required, as API params
+ * and options use {@link ol.proj.ProjectionLike} which means the simple string
+ * code will suffice.
+ *
+ * You can use {@link ol.proj.get} to retrieve the object for a particular
+ * projection.
+ *
+ * The library includes definitions for `EPSG:4326` and `EPSG:3857`, together
+ * with the following aliases:
+ * * `EPSG:4326`: CRS:84, urn:ogc:def:crs:EPSG:6.6:4326,
+ *     urn:ogc:def:crs:OGC:1.3:CRS84, urn:ogc:def:crs:OGC:2:84,
+ *     http://www.opengis.net/gml/srs/epsg.xml#4326,
+ *     urn:x-ogc:def:crs:EPSG:4326
+ * * `EPSG:3857`: EPSG:102100, EPSG:102113, EPSG:900913,
+ *     urn:ogc:def:crs:EPSG:6.18:3:3857,
+ *     http://www.opengis.net/gml/srs/epsg.xml#3857
+ *
+ * If you use proj4js, aliases can be added using `proj4.defs()`; see
+ * [documentation](https://github.com/proj4js/proj4js).
+ *
+ * @constructor
+ * @param {olx.ProjectionOptions} options Projection options.
+ * @struct
+ * @api stable
+ */
+ol.proj.Projection = function(options) {
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.code_ = options.code;
+
+  /**
+   * @private
+   * @type {ol.proj.Units}
+   */
+  this.units_ = /** @type {ol.proj.Units} */ (options.units);
+
+  /**
+   * @private
+   * @type {ol.Extent}
+   */
+  this.extent_ = options.extent !== undefined ? options.extent : null;
+
+  /**
+   * @private
+   * @type {ol.Extent}
+   */
+  this.worldExtent_ = options.worldExtent !== undefined ?
+      options.worldExtent : null;
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.axisOrientation_ = options.axisOrientation !== undefined ?
+      options.axisOrientation : 'enu';
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.global_ = options.global !== undefined ? options.global : false;
+
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.canWrapX_ = !!(this.global_ && this.extent_);
+
+  /**
+  * @private
+  * @type {function(number, ol.Coordinate):number}
+  */
+  this.getPointResolutionFunc_ = options.getPointResolution !== undefined ?
+      options.getPointResolution : this.getPointResolution_;
+
+  /**
+   * @private
+   * @type {ol.tilegrid.TileGrid}
+   */
+  this.defaultTileGrid_ = null;
+
+  var projections = ol.proj.projections_;
+  var code = options.code;
+  goog.asserts.assert(code !== undefined,
+      'Option "code" is required for constructing instance');
+  if (ol.ENABLE_PROJ4JS && typeof proj4 == 'function' &&
+      projections[code] === undefined) {
+    var def = proj4.defs(code);
+    if (def !== undefined) {
+      if (def.axis !== undefined && options.axisOrientation === undefined) {
+        this.axisOrientation_ = def.axis;
+      }
+      if (options.units === undefined) {
+        var units = def.units;
+        if (def.to_meter !== undefined) {
+          if (units === undefined ||
+              ol.proj.METERS_PER_UNIT[units] === undefined) {
+            units = def.to_meter.toString();
+            ol.proj.METERS_PER_UNIT[units] = def.to_meter;
+          }
+        }
+        this.units_ = units;
+      }
+      var currentCode, currentDef, currentProj, proj4Transform;
+      for (currentCode in projections) {
+        currentDef = proj4.defs(currentCode);
+        if (currentDef !== undefined) {
+          currentProj = ol.proj.get(currentCode);
+          if (currentDef === def) {
+            ol.proj.addEquivalentProjections([currentProj, this]);
+          } else {
+            proj4Transform = proj4(currentCode, code);
+            ol.proj.addCoordinateTransforms(currentProj, this,
+                proj4Transform.forward, proj4Transform.inverse);
+          }
+        }
+      }
+    }
+  }
+
+};
+
+
+/**
+ * @return {boolean} The projection is suitable for wrapping the x-axis
+ */
+ol.proj.Projection.prototype.canWrapX = function() {
+  return this.canWrapX_;
+};
+
+
+/**
+ * Get the code for this projection, e.g. 'EPSG:4326'.
+ * @return {string} Code.
+ * @api stable
+ */
+ol.proj.Projection.prototype.getCode = function() {
+  return this.code_;
+};
+
+
+/**
+ * Get the validity extent for this projection.
+ * @return {ol.Extent} Extent.
+ * @api stable
+ */
+ol.proj.Projection.prototype.getExtent = function() {
+  return this.extent_;
+};
+
+
+/**
+ * Get the units of this projection.
+ * @return {ol.proj.Units} Units.
+ * @api stable
+ */
+ol.proj.Projection.prototype.getUnits = function() {
+  return this.units_;
+};
+
+
+/**
+ * Get the amount of meters per unit of this projection.  If the projection is
+ * not configured with a units identifier, the return is `undefined`.
+ * @return {number|undefined} Meters.
+ * @api stable
+ */
+ol.proj.Projection.prototype.getMetersPerUnit = function() {
+  return ol.proj.METERS_PER_UNIT[this.units_];
+};
+
+
+/**
+ * Get the world extent for this projection.
+ * @return {ol.Extent} Extent.
+ * @api
+ */
+ol.proj.Projection.prototype.getWorldExtent = function() {
+  return this.worldExtent_;
+};
+
+
+/**
+ * Get the axis orientation of this projection.
+ * Example values are:
+ * enu - the default easting, northing, elevation.
+ * neu - northing, easting, up - useful for "lat/long" geographic coordinates,
+ *     or south orientated transverse mercator.
+ * wnu - westing, northing, up - some planetary coordinate systems have
+ *     "west positive" coordinate systems
+ * @return {string} Axis orientation.
+ */
+ol.proj.Projection.prototype.getAxisOrientation = function() {
+  return this.axisOrientation_;
+};
+
+
+/**
+ * Is this projection a global projection which spans the whole world?
+ * @return {boolean} Whether the projection is global.
+ * @api stable
+ */
+ol.proj.Projection.prototype.isGlobal = function() {
+  return this.global_;
+};
+
+
+/**
+* Set if the projection is a global projection which spans the whole world
+* @param {boolean} global Whether the projection is global.
+* @api stable
+*/
+ol.proj.Projection.prototype.setGlobal = function(global) {
+  this.global_ = global;
+  this.canWrapX_ = !!(global && this.extent_);
+};
+
+
+/**
+ * @return {ol.tilegrid.TileGrid} The default tile grid.
+ */
+ol.proj.Projection.prototype.getDefaultTileGrid = function() {
+  return this.defaultTileGrid_;
+};
+
+
+/**
+ * @param {ol.tilegrid.TileGrid} tileGrid The default tile grid.
+ */
+ol.proj.Projection.prototype.setDefaultTileGrid = function(tileGrid) {
+  this.defaultTileGrid_ = tileGrid;
+};
+
+
+/**
+ * Set the validity extent for this projection.
+ * @param {ol.Extent} extent Extent.
+ * @api stable
+ */
+ol.proj.Projection.prototype.setExtent = function(extent) {
+  this.extent_ = extent;
+  this.canWrapX_ = !!(this.global_ && extent);
+};
+
+
+/**
+ * Set the world extent for this projection.
+ * @param {ol.Extent} worldExtent World extent
+ *     [minlon, minlat, maxlon, maxlat].
+ * @api
+ */
+ol.proj.Projection.prototype.setWorldExtent = function(worldExtent) {
+  this.worldExtent_ = worldExtent;
+};
+
+
+/**
+* Set the getPointResolution function for this projection.
+* @param {function(number, ol.Coordinate):number} func Function
+* @api
+*/
+ol.proj.Projection.prototype.setGetPointResolution = function(func) {
+  this.getPointResolutionFunc_ = func;
+};
+
+
+/**
+* Default version.
+* Get the resolution of the point in degrees or distance units.
+* For projections with degrees as the unit this will simply return the
+* provided resolution. For other projections the point resolution is
+* estimated by transforming the 'point' pixel to EPSG:4326,
+* measuring its width and height on the normal sphere,
+* and taking the average of the width and height.
+* @param {number} resolution Nominal resolution in projection units.
+* @param {ol.Coordinate} point Point to find adjusted resolution at.
+* @return {number} Point resolution at point in projection units.
+* @private
+*/
+ol.proj.Projection.prototype.getPointResolution_ = function(resolution, point) {
+  var units = this.getUnits();
+  if (units == ol.proj.Units.DEGREES) {
+    return resolution;
+  } else {
+    // Estimate point resolution by transforming the center pixel to EPSG:4326,
+    // measuring its width and height on the normal sphere, and taking the
+    // average of the width and height.
+    var toEPSG4326 = ol.proj.getTransformFromProjections(
+        this, ol.proj.get('EPSG:4326'));
+    var vertices = [
+      point[0] - resolution / 2, point[1],
+      point[0] + resolution / 2, point[1],
+      point[0], point[1] - resolution / 2,
+      point[0], point[1] + resolution / 2
+    ];
+    vertices = toEPSG4326(vertices, vertices, 2);
+    var width = ol.sphere.NORMAL.haversineDistance(
+        vertices.slice(0, 2), vertices.slice(2, 4));
+    var height = ol.sphere.NORMAL.haversineDistance(
+        vertices.slice(4, 6), vertices.slice(6, 8));
+    var pointResolution = (width + height) / 2;
+    var metersPerUnit = this.getMetersPerUnit();
+    if (metersPerUnit !== undefined) {
+      pointResolution /= metersPerUnit;
+    }
+    return pointResolution;
+  }
+};
+
+
+/**
+ * Get the resolution of the point in degrees or distance units.
+ * For projections with degrees as the unit this will simply return the
+ * provided resolution. The default for other projections is to estimate
+ * the point resolution by transforming the 'point' pixel to EPSG:4326,
+ * measuring its width and height on the normal sphere,
+ * and taking the average of the width and height.
+ * An alternative implementation may be given when constructing a
+ * projection. For many local projections,
+ * such a custom function will return the resolution unchanged.
+ * @param {number} resolution Resolution in projection units.
+ * @param {ol.Coordinate} point Point.
+ * @return {number} Point resolution in projection units.
+ * @api
+ */
+ol.proj.Projection.prototype.getPointResolution = function(resolution, point) {
+  return this.getPointResolutionFunc_(resolution, point);
+};
+
+
+/**
+ * @private
+ * @type {Object.<string, ol.proj.Projection>}
+ */
+ol.proj.projections_ = {};
+
+
+/**
+ * @private
+ * @type {Object.<string, Object.<string, ol.TransformFunction>>}
+ */
+ol.proj.transforms_ = {};
+
+
+/**
+ * Registers transformation functions that don't alter coordinates. Those allow
+ * to transform between projections with equal meaning.
+ *
+ * @param {Array.<ol.proj.Projection>} projections Projections.
+ * @api
+ */
+ol.proj.addEquivalentProjections = function(projections) {
+  ol.proj.addProjections(projections);
+  projections.forEach(function(source) {
+    projections.forEach(function(destination) {
+      if (source !== destination) {
+        ol.proj.addTransform(source, destination, ol.proj.cloneTransform);
+      }
+    });
+  });
+};
+
+
+/**
+ * Registers transformation functions to convert coordinates in any projection
+ * in projection1 to any projection in projection2.
+ *
+ * @param {Array.<ol.proj.Projection>} projections1 Projections with equal
+ *     meaning.
+ * @param {Array.<ol.proj.Projection>} projections2 Projections with equal
+ *     meaning.
+ * @param {ol.TransformFunction} forwardTransform Transformation from any
+ *   projection in projection1 to any projection in projection2.
+ * @param {ol.TransformFunction} inverseTransform Transform from any projection
+ *   in projection2 to any projection in projection1..
+ */
+ol.proj.addEquivalentTransforms =
+    function(projections1, projections2, forwardTransform, inverseTransform) {
+  projections1.forEach(function(projection1) {
+    projections2.forEach(function(projection2) {
+      ol.proj.addTransform(projection1, projection2, forwardTransform);
+      ol.proj.addTransform(projection2, projection1, inverseTransform);
+    });
+  });
+};
+
+
+/**
+ * Add a Projection object to the list of supported projections that can be
+ * looked up by their code.
+ *
+ * @param {ol.proj.Projection} projection Projection instance.
+ * @api stable
+ */
+ol.proj.addProjection = function(projection) {
+  ol.proj.projections_[projection.getCode()] = projection;
+  ol.proj.addTransform(projection, projection, ol.proj.cloneTransform);
+};
+
+
+/**
+ * @param {Array.<ol.proj.Projection>} projections Projections.
+ */
+ol.proj.addProjections = function(projections) {
+  var addedProjections = [];
+  projections.forEach(function(projection) {
+    addedProjections.push(ol.proj.addProjection(projection));
+  });
+};
+
+
+/**
+ * FIXME empty description for jsdoc
+ */
+ol.proj.clearAllProjections = function() {
+  ol.proj.projections_ = {};
+  ol.proj.transforms_ = {};
+};
+
+
+/**
+ * @param {ol.proj.Projection|string|undefined} projection Projection.
+ * @param {string} defaultCode Default code.
+ * @return {ol.proj.Projection} Projection.
+ */
+ol.proj.createProjection = function(projection, defaultCode) {
+  if (!projection) {
+    return ol.proj.get(defaultCode);
+  } else if (goog.isString(projection)) {
+    return ol.proj.get(projection);
+  } else {
+    goog.asserts.assertInstanceof(projection, ol.proj.Projection,
+        'projection should be an ol.proj.Projection');
+    return projection;
+  }
+};
+
+
+/**
+ * Registers a conversion function to convert coordinates from the source
+ * projection to the destination projection.
+ *
+ * @param {ol.proj.Projection} source Source.
+ * @param {ol.proj.Projection} destination Destination.
+ * @param {ol.TransformFunction} transformFn Transform.
+ */
+ol.proj.addTransform = function(source, destination, transformFn) {
+  var sourceCode = source.getCode();
+  var destinationCode = destination.getCode();
+  var transforms = ol.proj.transforms_;
+  if (!(sourceCode in transforms)) {
+    transforms[sourceCode] = {};
+  }
+  transforms[sourceCode][destinationCode] = transformFn;
+};
+
+
+/**
+ * Registers coordinate transform functions to convert coordinates between the
+ * source projection and the destination projection.
+ * The forward and inverse functions convert coordinate pairs; this function
+ * converts these into the functions used internally which also handle
+ * extents and coordinate arrays.
+ *
+ * @param {ol.proj.ProjectionLike} source Source projection.
+ * @param {ol.proj.ProjectionLike} destination Destination projection.
+ * @param {function(ol.Coordinate): ol.Coordinate} forward The forward transform
+ *     function (that is, from the source projection to the destination
+ *     projection) that takes a {@link ol.Coordinate} as argument and returns
+ *     the transformed {@link ol.Coordinate}.
+ * @param {function(ol.Coordinate): ol.Coordinate} inverse The inverse transform
+ *     function (that is, from the destination projection to the source
+ *     projection) that takes a {@link ol.Coordinate} as argument and returns
+ *     the transformed {@link ol.Coordinate}.
+ * @api stable
+ */
+ol.proj.addCoordinateTransforms =
+    function(source, destination, forward, inverse) {
+  var sourceProj = ol.proj.get(source);
+  var destProj = ol.proj.get(destination);
+  ol.proj.addTransform(sourceProj, destProj,
+      ol.proj.createTransformFromCoordinateTransform(forward));
+  ol.proj.addTransform(destProj, sourceProj,
+      ol.proj.createTransformFromCoordinateTransform(inverse));
+};
+
+
+/**
+ * Creates a {@link ol.TransformFunction} from a simple 2D coordinate transform
+ * function.
+ * @param {function(ol.Coordinate): ol.Coordinate} transform Coordinate
+ *     transform.
+ * @return {ol.TransformFunction} Transform function.
+ */
+ol.proj.createTransformFromCoordinateTransform = function(transform) {
+  return (
+      /**
+       * @param {Array.<number>} input Input.
+       * @param {Array.<number>=} opt_output Output.
+       * @param {number=} opt_dimension Dimension.
+       * @return {Array.<number>} Output.
+       */
+      function(input, opt_output, opt_dimension) {
+        var length = input.length;
+        var dimension = opt_dimension !== undefined ? opt_dimension : 2;
+        var output = opt_output !== undefined ? opt_output : new Array(length);
+        var point, i, j;
+        for (i = 0; i < length; i += dimension) {
+          point = transform([input[i], input[i + 1]]);
+          output[i] = point[0];
+          output[i + 1] = point[1];
+          for (j = dimension - 1; j >= 2; --j) {
+            output[i + j] = input[i + j];
+          }
+        }
+        return output;
+      });
+};
+
+
+/**
+ * Unregisters the conversion function to convert coordinates from the source
+ * projection to the destination projection.  This method is used to clean up
+ * cached transforms during testing.
+ *
+ * @param {ol.proj.Projection} source Source projection.
+ * @param {ol.proj.Projection} destination Destination projection.
+ * @return {ol.TransformFunction} transformFn The unregistered transform.
+ */
+ol.proj.removeTransform = function(source, destination) {
+  var sourceCode = source.getCode();
+  var destinationCode = destination.getCode();
+  var transforms = ol.proj.transforms_;
+  goog.asserts.assert(sourceCode in transforms,
+      'sourceCode should be in transforms');
+  goog.asserts.assert(destinationCode in transforms[sourceCode],
+      'destinationCode should be in transforms of sourceCode');
+  var transform = transforms[sourceCode][destinationCode];
+  delete transforms[sourceCode][destinationCode];
+  if (goog.object.isEmpty(transforms[sourceCode])) {
+    delete transforms[sourceCode];
+  }
+  return transform;
+};
+
+
+/**
+ * Transforms a coordinate from longitude/latitude to a different projection.
+ * @param {ol.Coordinate} coordinate Coordinate as longitude and latitude, i.e.
+ *     an array with longitude as 1st and latitude as 2nd element.
+ * @param {ol.proj.ProjectionLike=} opt_projection Target projection. The
+ *     default is Web Mercator, i.e. 'EPSG:3857'.
+ * @return {ol.Coordinate} Coordinate projected to the target projection.
+ * @api stable
+ */
+ol.proj.fromLonLat = function(coordinate, opt_projection) {
+  return ol.proj.transform(coordinate, 'EPSG:4326',
+      opt_projection !== undefined ? opt_projection : 'EPSG:3857');
+};
+
+
+/**
+ * Transforms a coordinate to longitude/latitude.
+ * @param {ol.Coordinate} coordinate Projected coordinate.
+ * @param {ol.proj.ProjectionLike=} opt_projection Projection of the coordinate.
+ *     The default is Web Mercator, i.e. 'EPSG:3857'.
+ * @return {ol.Coordinate} Coordinate as longitude and latitude, i.e. an array
+ *     with longitude as 1st and latitude as 2nd element.
+ * @api stable
+ */
+ol.proj.toLonLat = function(coordinate, opt_projection) {
+  return ol.proj.transform(coordinate,
+      opt_projection !== undefined ? opt_projection : 'EPSG:3857', 'EPSG:4326');
+};
+
+
+/**
+ * Fetches a Projection object for the code specified.
+ *
+ * @param {ol.proj.ProjectionLike} projectionLike Either a code string which is
+ *     a combination of authority and identifier such as "EPSG:4326", or an
+ *     existing projection object, or undefined.
+ * @return {ol.proj.Projection} Projection object, or null if not in list.
+ * @api stable
+ */
+ol.proj.get = function(projectionLike) {
+  var projection;
+  if (projectionLike instanceof ol.proj.Projection) {
+    projection = projectionLike;
+  } else if (goog.isString(projectionLike)) {
+    var code = projectionLike;
+    projection = ol.proj.projections_[code];
+    if (ol.ENABLE_PROJ4JS && projection === undefined &&
+        typeof proj4 == 'function' && proj4.defs(code) !== undefined) {
+      projection = new ol.proj.Projection({code: code});
+      ol.proj.addProjection(projection);
+    }
+  } else {
+    projection = null;
+  }
+  return projection;
+};
+
+
+/**
+ * Checks if two projections are the same, that is every coordinate in one
+ * projection does represent the same geographic point as the same coordinate in
+ * the other projection.
+ *
+ * @param {ol.proj.Projection} projection1 Projection 1.
+ * @param {ol.proj.Projection} projection2 Projection 2.
+ * @return {boolean} Equivalent.
+ */
+ol.proj.equivalent = function(projection1, projection2) {
+  if (projection1 === projection2) {
+    return true;
+  }
+  var equalUnits = projection1.getUnits() === projection2.getUnits();
+  if (projection1.getCode() === projection2.getCode()) {
+    return equalUnits;
+  } else {
+    var transformFn = ol.proj.getTransformFromProjections(
+        projection1, projection2);
+    return transformFn === ol.proj.cloneTransform && equalUnits;
+  }
+};
+
+
+/**
+ * Given the projection-like objects, searches for a transformation
+ * function to convert a coordinates array from the source projection to the
+ * destination projection.
+ *
+ * @param {ol.proj.ProjectionLike} source Source.
+ * @param {ol.proj.ProjectionLike} destination Destination.
+ * @return {ol.TransformFunction} Transform function.
+ * @api stable
+ */
+ol.proj.getTransform = function(source, destination) {
+  var sourceProjection = ol.proj.get(source);
+  var destinationProjection = ol.proj.get(destination);
+  return ol.proj.getTransformFromProjections(
+      sourceProjection, destinationProjection);
+};
+
+
+/**
+ * Searches in the list of transform functions for the function for converting
+ * coordinates from the source projection to the destination projection.
+ *
+ * @param {ol.proj.Projection} sourceProjection Source Projection object.
+ * @param {ol.proj.Projection} destinationProjection Destination Projection
+ *     object.
+ * @return {ol.TransformFunction} Transform function.
+ */
+ol.proj.getTransformFromProjections =
+    function(sourceProjection, destinationProjection) {
+  var transforms = ol.proj.transforms_;
+  var sourceCode = sourceProjection.getCode();
+  var destinationCode = destinationProjection.getCode();
+  var transform;
+  if (sourceCode in transforms && destinationCode in transforms[sourceCode]) {
+    transform = transforms[sourceCode][destinationCode];
+  }
+  if (transform === undefined) {
+    goog.asserts.assert(transform !== undefined, 'transform should be defined');
+    transform = ol.proj.identityTransform;
+  }
+  return transform;
+};
+
+
+/**
+ * @param {Array.<number>} input Input coordinate array.
+ * @param {Array.<number>=} opt_output Output array of coordinate values.
+ * @param {number=} opt_dimension Dimension.
+ * @return {Array.<number>} Input coordinate array (same array as input).
+ */
+ol.proj.identityTransform = function(input, opt_output, opt_dimension) {
+  if (opt_output !== undefined && input !== opt_output) {
+    // TODO: consider making this a warning instead
+    goog.asserts.fail('This should not be used internally.');
+    for (var i = 0, ii = input.length; i < ii; ++i) {
+      opt_output[i] = input[i];
+    }
+    input = opt_output;
+  }
+  return input;
+};
+
+
+/**
+ * @param {Array.<number>} input Input coordinate array.
+ * @param {Array.<number>=} opt_output Output array of coordinate values.
+ * @param {number=} opt_dimension Dimension.
+ * @return {Array.<number>} Output coordinate array (new array, same coordinate
+ *     values).
+ */
+ol.proj.cloneTransform = function(input, opt_output, opt_dimension) {
+  var output;
+  if (opt_output !== undefined) {
+    for (var i = 0, ii = input.length; i < ii; ++i) {
+      opt_output[i] = input[i];
+    }
+    output = opt_output;
+  } else {
+    output = input.slice();
+  }
+  return output;
+};
+
+
+/**
+ * Transforms a coordinate from source projection to destination projection.
+ * This returns a new coordinate (and does not modify the original).
+ *
+ * See {@link ol.proj.transformExtent} for extent transformation.
+ * See the transform method of {@link ol.geom.Geometry} and its subclasses for
+ * geometry transforms.
+ *
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {ol.proj.ProjectionLike} source Source projection-like.
+ * @param {ol.proj.ProjectionLike} destination Destination projection-like.
+ * @return {ol.Coordinate} Coordinate.
+ * @api stable
+ */
+ol.proj.transform = function(coordinate, source, destination) {
+  var transformFn = ol.proj.getTransform(source, destination);
+  return transformFn(coordinate, undefined, coordinate.length);
+};
+
+
+/**
+ * Transforms an extent from source projection to destination projection.  This
+ * returns a new extent (and does not modify the original).
+ *
+ * @param {ol.Extent} extent The extent to transform.
+ * @param {ol.proj.ProjectionLike} source Source projection-like.
+ * @param {ol.proj.ProjectionLike} destination Destination projection-like.
+ * @return {ol.Extent} The transformed extent.
+ * @api stable
+ */
+ol.proj.transformExtent = function(extent, source, destination) {
+  var transformFn = ol.proj.getTransform(source, destination);
+  return ol.extent.applyTransform(extent, transformFn);
+};
+
+
+/**
+ * Transforms the given point to the destination projection.
+ *
+ * @param {ol.Coordinate} point Point.
+ * @param {ol.proj.Projection} sourceProjection Source projection.
+ * @param {ol.proj.Projection} destinationProjection Destination projection.
+ * @return {ol.Coordinate} Point.
+ */
+ol.proj.transformWithProjections =
+    function(point, sourceProjection, destinationProjection) {
+  var transformFn = ol.proj.getTransformFromProjections(
+      sourceProjection, destinationProjection);
+  return transformFn(point);
+};
+
+goog.provide('ol.geom.Geometry');
+goog.provide('ol.geom.GeometryLayout');
+goog.provide('ol.geom.GeometryType');
+
+goog.require('goog.asserts');
+goog.require('goog.functions');
+goog.require('ol.Object');
+goog.require('ol.extent');
+goog.require('ol.proj');
+goog.require('ol.proj.Units');
+
+
+/**
+ * The geometry type. One of `'Point'`, `'LineString'`, `'LinearRing'`,
+ * `'Polygon'`, `'MultiPoint'`, `'MultiLineString'`, `'MultiPolygon'`,
+ * `'GeometryCollection'`, `'Circle'`.
+ * @enum {string}
+ * @api stable
+ */
+ol.geom.GeometryType = {
+  POINT: 'Point',
+  LINE_STRING: 'LineString',
+  LINEAR_RING: 'LinearRing',
+  POLYGON: 'Polygon',
+  MULTI_POINT: 'MultiPoint',
+  MULTI_LINE_STRING: 'MultiLineString',
+  MULTI_POLYGON: 'MultiPolygon',
+  GEOMETRY_COLLECTION: 'GeometryCollection',
+  CIRCLE: 'Circle'
+};
+
+
+/**
+ * The coordinate layout for geometries, indicating whether a 3rd or 4th z ('Z')
+ * or measure ('M') coordinate is available. Supported values are `'XY'`,
+ * `'XYZ'`, `'XYM'`, `'XYZM'`.
+ * @enum {string}
+ * @api stable
+ */
+ol.geom.GeometryLayout = {
+  XY: 'XY',
+  XYZ: 'XYZ',
+  XYM: 'XYM',
+  XYZM: 'XYZM'
+};
+
+
+
+/**
+ * @classdesc
+ * Abstract base class; normally only used for creating subclasses and not
+ * instantiated in apps.
+ * Base class for vector geometries.
+ *
+ * To get notified of changes to the geometry, register a listener for the
+ * generic `change` event on your geometry instance.
+ *
+ * @constructor
+ * @extends {ol.Object}
+ * @api stable
+ */
+ol.geom.Geometry = function() {
+
+  goog.base(this);
+
+  /**
+   * @private
+   * @type {ol.Extent}
+   */
+  this.extent_ = ol.extent.createEmpty();
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.extentRevision_ = -1;
+
+  /**
+   * @protected
+   * @type {Object.<string, ol.geom.Geometry>}
+   */
+  this.simplifiedGeometryCache = {};
+
+  /**
+   * @protected
+   * @type {number}
+   */
+  this.simplifiedGeometryMaxMinSquaredTolerance = 0;
+
+  /**
+   * @protected
+   * @type {number}
+   */
+  this.simplifiedGeometryRevision = 0;
+
+};
+goog.inherits(ol.geom.Geometry, ol.Object);
+
+
+/**
+ * Make a complete copy of the geometry.
+ * @function
+ * @return {!ol.geom.Geometry} Clone.
+ */
+ol.geom.Geometry.prototype.clone = goog.abstractMethod;
+
+
+/**
+ * @param {number} x X.
+ * @param {number} y Y.
+ * @param {ol.Coordinate} closestPoint Closest point.
+ * @param {number} minSquaredDistance Minimum squared distance.
+ * @return {number} Minimum squared distance.
+ */
+ol.geom.Geometry.prototype.closestPointXY = goog.abstractMethod;
+
+
+/**
+ * Return the closest point of the geometry to the passed point as
+ * {@link ol.Coordinate coordinate}.
+ * @param {ol.Coordinate} point Point.
+ * @param {ol.Coordinate=} opt_closestPoint Closest point.
+ * @return {ol.Coordinate} Closest point.
+ * @api stable
+ */
+ol.geom.Geometry.prototype.getClosestPoint = function(point, opt_closestPoint) {
+  var closestPoint = opt_closestPoint ? opt_closestPoint : [NaN, NaN];
+  this.closestPointXY(point[0], point[1], closestPoint, Infinity);
+  return closestPoint;
+};
+
+
+/**
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @return {boolean} Contains coordinate.
+ */
+ol.geom.Geometry.prototype.containsCoordinate = function(coordinate) {
+  return this.containsXY(coordinate[0], coordinate[1]);
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @protected
+ * @return {ol.Extent} extent Extent.
+ */
+ol.geom.Geometry.prototype.computeExtent = goog.abstractMethod;
+
+
+/**
+ * @param {number} x X.
+ * @param {number} y Y.
+ * @return {boolean} Contains (x, y).
+ */
+ol.geom.Geometry.prototype.containsXY = goog.functions.FALSE;
+
+
+/**
+ * Get the extent of the geometry.
+ * @param {ol.Extent=} opt_extent Extent.
+ * @return {ol.Extent} extent Extent.
+ * @api stable
+ */
+ol.geom.Geometry.prototype.getExtent = function(opt_extent) {
+  if (this.extentRevision_ != this.getRevision()) {
+    this.extent_ = this.computeExtent(this.extent_);
+    this.extentRevision_ = this.getRevision();
+  }
+  return ol.extent.returnOrUpdate(this.extent_, opt_extent);
+};
+
+
+/**
+ * Create a simplified version of this geometry.  For linestrings, this uses
+ * the the {@link
+ * https://en.wikipedia.org/wiki/Ramer-Douglas-Peucker_algorithm
+ * Douglas Peucker} algorithm.  For polygons, a quantization-based
+ * simplification is used to preserve topology.
+ * @function
+ * @param {number} tolerance The tolerance distance for simplification.
+ * @return {ol.geom.Geometry} A new, simplified version of the original
+ *     geometry.
+ * @api
+ */
+ol.geom.Geometry.prototype.simplify = function(tolerance) {
+  return this.getSimplifiedGeometry(tolerance * tolerance);
+};
+
+
+/**
+ * Create a simplified version of this geometry using the Douglas Peucker
+ * algorithm.
+ * @see https://en.wikipedia.org/wiki/Ramer-Douglas-Peucker_algorithm
+ * @function
+ * @param {number} squaredTolerance Squared tolerance.
+ * @return {ol.geom.Geometry} Simplified geometry.
+ */
+ol.geom.Geometry.prototype.getSimplifiedGeometry = goog.abstractMethod;
+
+
+/**
+ * Get the type of this geometry.
+ * @function
+ * @return {ol.geom.GeometryType} Geometry type.
+ */
+ol.geom.Geometry.prototype.getType = goog.abstractMethod;
+
+
+/**
+ * Apply a transform function to each coordinate of the geometry.
+ * The geometry is modified in place.
+ * If you do not want the geometry modified in place, first clone() it and
+ * then use this function on the clone.
+ * @function
+ * @param {ol.TransformFunction} transformFn Transform.
+ */
+ol.geom.Geometry.prototype.applyTransform = goog.abstractMethod;
+
+
+/**
+ * Test if the geometry and the passed extent intersect.
+ * @param {ol.Extent} extent Extent.
+ * @return {boolean} `true` if the geometry and the extent intersect.
+ * @function
+ */
+ol.geom.Geometry.prototype.intersectsExtent = goog.abstractMethod;
+
+
+/**
+ * Translate the geometry.  This modifies the geometry coordinates in place.  If
+ * instead you want a new geometry, first `clone()` this geometry.
+ * @param {number} deltaX Delta X.
+ * @param {number} deltaY Delta Y.
+ * @function
+ */
+ol.geom.Geometry.prototype.translate = goog.abstractMethod;
+
+
+/**
+ * Transform each coordinate of the geometry from one coordinate reference
+ * system to another. The geometry is modified in place.
+ * For example, a line will be transformed to a line and a circle to a circle.
+ * If you do not want the geometry modified in place, first clone() it and
+ * then use this function on the clone.
+ *
+ * @param {ol.proj.ProjectionLike} source The current projection.  Can be a
+ *     string identifier or a {@link ol.proj.Projection} object.
+ * @param {ol.proj.ProjectionLike} destination The desired projection.  Can be a
+ *     string identifier or a {@link ol.proj.Projection} object.
+ * @return {ol.geom.Geometry} This geometry.  Note that original geometry is
+ *     modified in place.
+ * @api stable
+ */
+ol.geom.Geometry.prototype.transform = function(source, destination) {
+  goog.asserts.assert(
+      ol.proj.get(source).getUnits() !== ol.proj.Units.TILE_PIXELS &&
+      ol.proj.get(destination).getUnits() !== ol.proj.Units.TILE_PIXELS,
+      'cannot transform geometries with TILE_PIXELS units');
+  this.applyTransform(ol.proj.getTransform(source, destination));
+  return this;
+};
+
+goog.provide('ol.geom.flat.transform');
+
+goog.require('goog.vec.Mat4');
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {goog.vec.Mat4.Number} transform Transform.
+ * @param {Array.<number>=} opt_dest Destination.
+ * @return {Array.<number>} Transformed coordinates.
+ */
+ol.geom.flat.transform.transform2D =
+    function(flatCoordinates, offset, end, stride, transform, opt_dest) {
+  var m00 = goog.vec.Mat4.getElement(transform, 0, 0);
+  var m10 = goog.vec.Mat4.getElement(transform, 1, 0);
+  var m01 = goog.vec.Mat4.getElement(transform, 0, 1);
+  var m11 = goog.vec.Mat4.getElement(transform, 1, 1);
+  var m03 = goog.vec.Mat4.getElement(transform, 0, 3);
+  var m13 = goog.vec.Mat4.getElement(transform, 1, 3);
+  var dest = opt_dest ? opt_dest : [];
+  var i = 0;
+  var j;
+  for (j = offset; j < end; j += stride) {
+    var x = flatCoordinates[j];
+    var y = flatCoordinates[j + 1];
+    dest[i++] = m00 * x + m01 * y + m03;
+    dest[i++] = m10 * x + m11 * y + m13;
+  }
+  if (opt_dest && dest.length != i) {
+    dest.length = i;
+  }
+  return dest;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {number} deltaX Delta X.
+ * @param {number} deltaY Delta Y.
+ * @param {Array.<number>=} opt_dest Destination.
+ * @return {Array.<number>} Transformed coordinates.
+ */
+ol.geom.flat.transform.translate =
+    function(flatCoordinates, offset, end, stride, deltaX, deltaY, opt_dest) {
+  var dest = opt_dest ? opt_dest : [];
+  var i = 0;
+  var j, k;
+  for (j = offset; j < end; j += stride) {
+    dest[i++] = flatCoordinates[j] + deltaX;
+    dest[i++] = flatCoordinates[j + 1] + deltaY;
+    for (k = j + 2; k < j + stride; ++k) {
+      dest[i++] = flatCoordinates[k];
+    }
+  }
+  if (opt_dest && dest.length != i) {
+    dest.length = i;
+  }
+  return dest;
+};
+
+goog.provide('ol.geom.SimpleGeometry');
+
+goog.require('goog.asserts');
+goog.require('goog.functions');
+goog.require('goog.object');
+goog.require('ol.extent');
+goog.require('ol.geom.Geometry');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.flat.transform');
+
+
+
+/**
+ * @classdesc
+ * Abstract base class; only used for creating subclasses; do not instantiate
+ * in apps, as cannot be rendered.
+ *
+ * @constructor
+ * @extends {ol.geom.Geometry}
+ * @api stable
+ */
+ol.geom.SimpleGeometry = function() {
+
+  goog.base(this);
+
+  /**
+   * @protected
+   * @type {ol.geom.GeometryLayout}
+   */
+  this.layout = ol.geom.GeometryLayout.XY;
+
+  /**
+   * @protected
+   * @type {number}
+   */
+  this.stride = 2;
+
+  /**
+   * @protected
+   * @type {Array.<number>}
+   */
+  this.flatCoordinates = null;
+
+};
+goog.inherits(ol.geom.SimpleGeometry, ol.geom.Geometry);
+
+
+/**
+ * @param {number} stride Stride.
+ * @private
+ * @return {ol.geom.GeometryLayout} layout Layout.
+ */
+ol.geom.SimpleGeometry.getLayoutForStride_ = function(stride) {
+  if (stride == 2) {
+    return ol.geom.GeometryLayout.XY;
+  } else if (stride == 3) {
+    return ol.geom.GeometryLayout.XYZ;
+  } else if (stride == 4) {
+    return ol.geom.GeometryLayout.XYZM;
+  } else {
+    goog.asserts.fail('unsupported stride: ' + stride);
+  }
+};
+
+
+/**
+ * @param {ol.geom.GeometryLayout} layout Layout.
+ * @return {number} Stride.
+ */
+ol.geom.SimpleGeometry.getStrideForLayout = function(layout) {
+  if (layout == ol.geom.GeometryLayout.XY) {
+    return 2;
+  } else if (layout == ol.geom.GeometryLayout.XYZ) {
+    return 3;
+  } else if (layout == ol.geom.GeometryLayout.XYM) {
+    return 3;
+  } else if (layout == ol.geom.GeometryLayout.XYZM) {
+    return 4;
+  } else {
+    goog.asserts.fail('unsupported layout: ' + layout);
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.SimpleGeometry.prototype.containsXY = goog.functions.FALSE;
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.SimpleGeometry.prototype.computeExtent = function(extent) {
+  return ol.extent.createOrUpdateFromFlatCoordinates(
+      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
+      extent);
+};
+
+
+/**
+ * @return {Array} Coordinates.
+ */
+ol.geom.SimpleGeometry.prototype.getCoordinates = goog.abstractMethod;
+
+
+/**
+ * Return the first coordinate of the geometry.
+ * @return {ol.Coordinate} First coordinate.
+ * @api stable
+ */
+ol.geom.SimpleGeometry.prototype.getFirstCoordinate = function() {
+  return this.flatCoordinates.slice(0, this.stride);
+};
+
+
+/**
+ * @return {Array.<number>} Flat coordinates.
+ */
+ol.geom.SimpleGeometry.prototype.getFlatCoordinates = function() {
+  return this.flatCoordinates;
+};
+
+
+/**
+ * Return the last coordinate of the geometry.
+ * @return {ol.Coordinate} Last point.
+ * @api stable
+ */
+ol.geom.SimpleGeometry.prototype.getLastCoordinate = function() {
+  return this.flatCoordinates.slice(this.flatCoordinates.length - this.stride);
+};
+
+
+/**
+ * Return the {@link ol.geom.GeometryLayout layout} of the geometry.
+ * @return {ol.geom.GeometryLayout} Layout.
+ * @api stable
+ */
+ol.geom.SimpleGeometry.prototype.getLayout = function() {
+  return this.layout;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.SimpleGeometry.prototype.getSimplifiedGeometry =
+    function(squaredTolerance) {
+  if (this.simplifiedGeometryRevision != this.getRevision()) {
+    goog.object.clear(this.simplifiedGeometryCache);
+    this.simplifiedGeometryMaxMinSquaredTolerance = 0;
+    this.simplifiedGeometryRevision = this.getRevision();
+  }
+  // If squaredTolerance is negative or if we know that simplification will not
+  // have any effect then just return this.
+  if (squaredTolerance < 0 ||
+      (this.simplifiedGeometryMaxMinSquaredTolerance !== 0 &&
+       squaredTolerance <= this.simplifiedGeometryMaxMinSquaredTolerance)) {
+    return this;
+  }
+  var key = squaredTolerance.toString();
+  if (this.simplifiedGeometryCache.hasOwnProperty(key)) {
+    return this.simplifiedGeometryCache[key];
+  } else {
+    var simplifiedGeometry =
+        this.getSimplifiedGeometryInternal(squaredTolerance);
+    var simplifiedFlatCoordinates = simplifiedGeometry.getFlatCoordinates();
+    if (simplifiedFlatCoordinates.length < this.flatCoordinates.length) {
+      this.simplifiedGeometryCache[key] = simplifiedGeometry;
+      return simplifiedGeometry;
+    } else {
+      // Simplification did not actually remove any coordinates.  We now know
+      // that any calls to getSimplifiedGeometry with a squaredTolerance less
+      // than or equal to the current squaredTolerance will also not have any
+      // effect.  This allows us to short circuit simplification (saving CPU
+      // cycles) and prevents the cache of simplified geometries from filling
+      // up with useless identical copies of this geometry (saving memory).
+      this.simplifiedGeometryMaxMinSquaredTolerance = squaredTolerance;
+      return this;
+    }
+  }
+};
+
+
+/**
+ * @param {number} squaredTolerance Squared tolerance.
+ * @return {ol.geom.SimpleGeometry} Simplified geometry.
+ * @protected
+ */
+ol.geom.SimpleGeometry.prototype.getSimplifiedGeometryInternal =
+    function(squaredTolerance) {
+  return this;
+};
+
+
+/**
+ * @return {number} Stride.
+ */
+ol.geom.SimpleGeometry.prototype.getStride = function() {
+  return this.stride;
+};
+
+
+/**
+ * @param {ol.geom.GeometryLayout} layout Layout.
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @protected
+ */
+ol.geom.SimpleGeometry.prototype.setFlatCoordinatesInternal =
+    function(layout, flatCoordinates) {
+  this.stride = ol.geom.SimpleGeometry.getStrideForLayout(layout);
+  this.layout = layout;
+  this.flatCoordinates = flatCoordinates;
+};
+
+
+/**
+ * @param {Array} coordinates Coordinates.
+ * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ */
+ol.geom.SimpleGeometry.prototype.setCoordinates = goog.abstractMethod;
+
+
+/**
+ * @param {ol.geom.GeometryLayout|undefined} layout Layout.
+ * @param {Array} coordinates Coordinates.
+ * @param {number} nesting Nesting.
+ * @protected
+ */
+ol.geom.SimpleGeometry.prototype.setLayout =
+    function(layout, coordinates, nesting) {
+  /** @type {number} */
+  var stride;
+  if (layout) {
+    stride = ol.geom.SimpleGeometry.getStrideForLayout(layout);
+  } else {
+    var i;
+    for (i = 0; i < nesting; ++i) {
+      if (coordinates.length === 0) {
+        this.layout = ol.geom.GeometryLayout.XY;
+        this.stride = 2;
+        return;
+      } else {
+        coordinates = /** @type {Array} */ (coordinates[0]);
+      }
+    }
+    stride = (/** @type {Array} */ (coordinates)).length;
+    layout = ol.geom.SimpleGeometry.getLayoutForStride_(stride);
+  }
+  this.layout = layout;
+  this.stride = stride;
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.SimpleGeometry.prototype.applyTransform = function(transformFn) {
+  if (this.flatCoordinates) {
+    transformFn(this.flatCoordinates, this.flatCoordinates, this.stride);
+    this.changed();
+  }
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.SimpleGeometry.prototype.translate = function(deltaX, deltaY) {
+  var flatCoordinates = this.getFlatCoordinates();
+  if (flatCoordinates) {
+    var stride = this.getStride();
+    ol.geom.flat.transform.translate(
+        flatCoordinates, 0, flatCoordinates.length, stride,
+        deltaX, deltaY, flatCoordinates);
+    this.changed();
+  }
+};
+
+
+/**
+ * @param {ol.geom.SimpleGeometry} simpleGeometry Simple geometry.
+ * @param {goog.vec.Mat4.Number} transform Transform.
+ * @param {Array.<number>=} opt_dest Destination.
+ * @return {Array.<number>} Transformed flat coordinates.
+ */
+ol.geom.transformSimpleGeometry2D =
+    function(simpleGeometry, transform, opt_dest) {
+  var flatCoordinates = simpleGeometry.getFlatCoordinates();
+  if (!flatCoordinates) {
+    return null;
+  } else {
+    var stride = simpleGeometry.getStride();
+    return ol.geom.flat.transform.transform2D(
+        flatCoordinates, 0, flatCoordinates.length, stride,
+        transform, opt_dest);
+  }
+};
+
+goog.provide('ol.geom.flat.area');
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @return {number} Area.
+ */
+ol.geom.flat.area.linearRing = function(flatCoordinates, offset, end, stride) {
+  var twiceArea = 0;
+  var x1 = flatCoordinates[end - stride];
+  var y1 = flatCoordinates[end - stride + 1];
+  for (; offset < end; offset += stride) {
+    var x2 = flatCoordinates[offset];
+    var y2 = flatCoordinates[offset + 1];
+    twiceArea += y1 * x2 - x1 * y2;
+    x1 = x2;
+    y1 = y2;
+  }
+  return twiceArea / 2;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<number>} ends Ends.
+ * @param {number} stride Stride.
+ * @return {number} Area.
+ */
+ol.geom.flat.area.linearRings =
+    function(flatCoordinates, offset, ends, stride) {
+  var area = 0;
+  var i, ii;
+  for (i = 0, ii = ends.length; i < ii; ++i) {
+    var end = ends[i];
+    area += ol.geom.flat.area.linearRing(flatCoordinates, offset, end, stride);
+    offset = end;
+  }
+  return area;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<Array.<number>>} endss Endss.
+ * @param {number} stride Stride.
+ * @return {number} Area.
+ */
+ol.geom.flat.area.linearRingss =
+    function(flatCoordinates, offset, endss, stride) {
+  var area = 0;
+  var i, ii;
+  for (i = 0, ii = endss.length; i < ii; ++i) {
+    var ends = endss[i];
+    area +=
+        ol.geom.flat.area.linearRings(flatCoordinates, offset, ends, stride);
+    offset = ends[ends.length - 1];
+  }
+  return area;
+};
+
+goog.provide('ol.geom.flat.closest');
+
+goog.require('goog.asserts');
+goog.require('goog.math');
+goog.require('ol.math');
+
+
+/**
+ * Returns the point on the 2D line segment flatCoordinates[offset1] to
+ * flatCoordinates[offset2] that is closest to the point (x, y).  Extra
+ * dimensions are linearly interpolated.
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset1 Offset 1.
+ * @param {number} offset2 Offset 2.
+ * @param {number} stride Stride.
+ * @param {number} x X.
+ * @param {number} y Y.
+ * @param {Array.<number>} closestPoint Closest point.
+ */
+ol.geom.flat.closest.point =
+    function(flatCoordinates, offset1, offset2, stride, x, y, closestPoint) {
+  var x1 = flatCoordinates[offset1];
+  var y1 = flatCoordinates[offset1 + 1];
+  var dx = flatCoordinates[offset2] - x1;
+  var dy = flatCoordinates[offset2 + 1] - y1;
+  var i, offset;
+  if (dx === 0 && dy === 0) {
+    offset = offset1;
+  } else {
+    var t = ((x - x1) * dx + (y - y1) * dy) / (dx * dx + dy * dy);
+    if (t > 1) {
+      offset = offset2;
+    } else if (t > 0) {
+      for (i = 0; i < stride; ++i) {
+        closestPoint[i] = goog.math.lerp(flatCoordinates[offset1 + i],
+            flatCoordinates[offset2 + i], t);
+      }
+      closestPoint.length = stride;
+      return;
+    } else {
+      offset = offset1;
+    }
+  }
+  for (i = 0; i < stride; ++i) {
+    closestPoint[i] = flatCoordinates[offset + i];
+  }
+  closestPoint.length = stride;
+};
+
+
+/**
+ * Return the squared of the largest distance between any pair of consecutive
+ * coordinates.
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {number} maxSquaredDelta Max squared delta.
+ * @return {number} Max squared delta.
+ */
+ol.geom.flat.closest.getMaxSquaredDelta =
+    function(flatCoordinates, offset, end, stride, maxSquaredDelta) {
+  var x1 = flatCoordinates[offset];
+  var y1 = flatCoordinates[offset + 1];
+  for (offset += stride; offset < end; offset += stride) {
+    var x2 = flatCoordinates[offset];
+    var y2 = flatCoordinates[offset + 1];
+    var squaredDelta = ol.math.squaredDistance(x1, y1, x2, y2);
+    if (squaredDelta > maxSquaredDelta) {
+      maxSquaredDelta = squaredDelta;
+    }
+    x1 = x2;
+    y1 = y2;
+  }
+  return maxSquaredDelta;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<number>} ends Ends.
+ * @param {number} stride Stride.
+ * @param {number} maxSquaredDelta Max squared delta.
+ * @return {number} Max squared delta.
+ */
+ol.geom.flat.closest.getsMaxSquaredDelta =
+    function(flatCoordinates, offset, ends, stride, maxSquaredDelta) {
+  var i, ii;
+  for (i = 0, ii = ends.length; i < ii; ++i) {
+    var end = ends[i];
+    maxSquaredDelta = ol.geom.flat.closest.getMaxSquaredDelta(
+        flatCoordinates, offset, end, stride, maxSquaredDelta);
+    offset = end;
+  }
+  return maxSquaredDelta;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<Array.<number>>} endss Endss.
+ * @param {number} stride Stride.
+ * @param {number} maxSquaredDelta Max squared delta.
+ * @return {number} Max squared delta.
+ */
+ol.geom.flat.closest.getssMaxSquaredDelta =
+    function(flatCoordinates, offset, endss, stride, maxSquaredDelta) {
+  var i, ii;
+  for (i = 0, ii = endss.length; i < ii; ++i) {
+    var ends = endss[i];
+    maxSquaredDelta = ol.geom.flat.closest.getsMaxSquaredDelta(
+        flatCoordinates, offset, ends, stride, maxSquaredDelta);
+    offset = ends[ends.length - 1];
+  }
+  return maxSquaredDelta;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {number} maxDelta Max delta.
+ * @param {boolean} isRing Is ring.
+ * @param {number} x X.
+ * @param {number} y Y.
+ * @param {Array.<number>} closestPoint Closest point.
+ * @param {number} minSquaredDistance Minimum squared distance.
+ * @param {Array.<number>=} opt_tmpPoint Temporary point object.
+ * @return {number} Minimum squared distance.
+ */
+ol.geom.flat.closest.getClosestPoint = function(flatCoordinates, offset, end,
+    stride, maxDelta, isRing, x, y, closestPoint, minSquaredDistance,
+    opt_tmpPoint) {
+  if (offset == end) {
+    return minSquaredDistance;
+  }
+  var i, squaredDistance;
+  if (maxDelta === 0) {
+    // All points are identical, so just test the first point.
+    squaredDistance = ol.math.squaredDistance(
+        x, y, flatCoordinates[offset], flatCoordinates[offset + 1]);
+    if (squaredDistance < minSquaredDistance) {
+      for (i = 0; i < stride; ++i) {
+        closestPoint[i] = flatCoordinates[offset + i];
+      }
+      closestPoint.length = stride;
+      return squaredDistance;
+    } else {
+      return minSquaredDistance;
+    }
+  }
+  goog.asserts.assert(maxDelta > 0, 'maxDelta should be larger than 0');
+  var tmpPoint = opt_tmpPoint ? opt_tmpPoint : [NaN, NaN];
+  var index = offset + stride;
+  while (index < end) {
+    ol.geom.flat.closest.point(
+        flatCoordinates, index - stride, index, stride, x, y, tmpPoint);
+    squaredDistance = ol.math.squaredDistance(x, y, tmpPoint[0], tmpPoint[1]);
+    if (squaredDistance < minSquaredDistance) {
+      minSquaredDistance = squaredDistance;
+      for (i = 0; i < stride; ++i) {
+        closestPoint[i] = tmpPoint[i];
+      }
+      closestPoint.length = stride;
+      index += stride;
+    } else {
+      // Skip ahead multiple points, because we know that all the skipped
+      // points cannot be any closer than the closest point we have found so
+      // far.  We know this because we know how close the current point is, how
+      // close the closest point we have found so far is, and the maximum
+      // distance between consecutive points.  For example, if we're currently
+      // at distance 10, the best we've found so far is 3, and that the maximum
+      // distance between consecutive points is 2, then we'll need to skip at
+      // least (10 - 3) / 2 == 3 (rounded down) points to have any chance of
+      // finding a closer point.  We use Math.max(..., 1) to ensure that we
+      // always advance at least one point, to avoid an infinite loop.
+      index += stride * Math.max(
+          ((Math.sqrt(squaredDistance) -
+            Math.sqrt(minSquaredDistance)) / maxDelta) | 0, 1);
+    }
+  }
+  if (isRing) {
+    // Check the closing segment.
+    ol.geom.flat.closest.point(
+        flatCoordinates, end - stride, offset, stride, x, y, tmpPoint);
+    squaredDistance = ol.math.squaredDistance(x, y, tmpPoint[0], tmpPoint[1]);
+    if (squaredDistance < minSquaredDistance) {
+      minSquaredDistance = squaredDistance;
+      for (i = 0; i < stride; ++i) {
+        closestPoint[i] = tmpPoint[i];
+      }
+      closestPoint.length = stride;
+    }
+  }
+  return minSquaredDistance;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<number>} ends Ends.
+ * @param {number} stride Stride.
+ * @param {number} maxDelta Max delta.
+ * @param {boolean} isRing Is ring.
+ * @param {number} x X.
+ * @param {number} y Y.
+ * @param {Array.<number>} closestPoint Closest point.
+ * @param {number} minSquaredDistance Minimum squared distance.
+ * @param {Array.<number>=} opt_tmpPoint Temporary point object.
+ * @return {number} Minimum squared distance.
+ */
+ol.geom.flat.closest.getsClosestPoint = function(flatCoordinates, offset, ends,
+    stride, maxDelta, isRing, x, y, closestPoint, minSquaredDistance,
+    opt_tmpPoint) {
+  var tmpPoint = opt_tmpPoint ? opt_tmpPoint : [NaN, NaN];
+  var i, ii;
+  for (i = 0, ii = ends.length; i < ii; ++i) {
+    var end = ends[i];
+    minSquaredDistance = ol.geom.flat.closest.getClosestPoint(
+        flatCoordinates, offset, end, stride,
+        maxDelta, isRing, x, y, closestPoint, minSquaredDistance, tmpPoint);
+    offset = end;
+  }
+  return minSquaredDistance;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<Array.<number>>} endss Endss.
+ * @param {number} stride Stride.
+ * @param {number} maxDelta Max delta.
+ * @param {boolean} isRing Is ring.
+ * @param {number} x X.
+ * @param {number} y Y.
+ * @param {Array.<number>} closestPoint Closest point.
+ * @param {number} minSquaredDistance Minimum squared distance.
+ * @param {Array.<number>=} opt_tmpPoint Temporary point object.
+ * @return {number} Minimum squared distance.
+ */
+ol.geom.flat.closest.getssClosestPoint = function(flatCoordinates, offset,
+    endss, stride, maxDelta, isRing, x, y, closestPoint, minSquaredDistance,
+    opt_tmpPoint) {
+  var tmpPoint = opt_tmpPoint ? opt_tmpPoint : [NaN, NaN];
+  var i, ii;
+  for (i = 0, ii = endss.length; i < ii; ++i) {
+    var ends = endss[i];
+    minSquaredDistance = ol.geom.flat.closest.getsClosestPoint(
+        flatCoordinates, offset, ends, stride,
+        maxDelta, isRing, x, y, closestPoint, minSquaredDistance, tmpPoint);
+    offset = ends[ends.length - 1];
+  }
+  return minSquaredDistance;
+};
+
+goog.provide('ol.geom.flat.deflate');
+
+goog.require('goog.asserts');
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {number} stride Stride.
+ * @return {number} offset Offset.
+ */
+ol.geom.flat.deflate.coordinate =
+    function(flatCoordinates, offset, coordinate, stride) {
+  goog.asserts.assert(coordinate.length == stride,
+      'length of the coordinate array should match stride');
+  var i, ii;
+  for (i = 0, ii = coordinate.length; i < ii; ++i) {
+    flatCoordinates[offset++] = coordinate[i];
+  }
+  return offset;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<ol.Coordinate>} coordinates Coordinates.
+ * @param {number} stride Stride.
+ * @return {number} offset Offset.
+ */
+ol.geom.flat.deflate.coordinates =
+    function(flatCoordinates, offset, coordinates, stride) {
+  var i, ii;
+  for (i = 0, ii = coordinates.length; i < ii; ++i) {
+    var coordinate = coordinates[i];
+    goog.asserts.assert(coordinate.length == stride,
+        'length of coordinate array should match stride');
+    var j;
+    for (j = 0; j < stride; ++j) {
+      flatCoordinates[offset++] = coordinate[j];
+    }
+  }
+  return offset;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<Array.<ol.Coordinate>>} coordinatess Coordinatess.
+ * @param {number} stride Stride.
+ * @param {Array.<number>=} opt_ends Ends.
+ * @return {Array.<number>} Ends.
+ */
+ol.geom.flat.deflate.coordinatess =
+    function(flatCoordinates, offset, coordinatess, stride, opt_ends) {
+  var ends = opt_ends ? opt_ends : [];
+  var i = 0;
+  var j, jj;
+  for (j = 0, jj = coordinatess.length; j < jj; ++j) {
+    var end = ol.geom.flat.deflate.coordinates(
+        flatCoordinates, offset, coordinatess[j], stride);
+    ends[i++] = end;
+    offset = end;
+  }
+  ends.length = i;
+  return ends;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<Array.<Array.<ol.Coordinate>>>} coordinatesss Coordinatesss.
+ * @param {number} stride Stride.
+ * @param {Array.<Array.<number>>=} opt_endss Endss.
+ * @return {Array.<Array.<number>>} Endss.
+ */
+ol.geom.flat.deflate.coordinatesss =
+    function(flatCoordinates, offset, coordinatesss, stride, opt_endss) {
+  var endss = opt_endss ? opt_endss : [];
+  var i = 0;
+  var j, jj;
+  for (j = 0, jj = coordinatesss.length; j < jj; ++j) {
+    var ends = ol.geom.flat.deflate.coordinatess(
+        flatCoordinates, offset, coordinatesss[j], stride, endss[i]);
+    endss[i++] = ends;
+    offset = ends[ends.length - 1];
+  }
+  endss.length = i;
+  return endss;
+};
+
+goog.provide('ol.geom.flat.inflate');
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {Array.<ol.Coordinate>=} opt_coordinates Coordinates.
+ * @return {Array.<ol.Coordinate>} Coordinates.
+ */
+ol.geom.flat.inflate.coordinates =
+    function(flatCoordinates, offset, end, stride, opt_coordinates) {
+  var coordinates = opt_coordinates !== undefined ? opt_coordinates : [];
+  var i = 0;
+  var j;
+  for (j = offset; j < end; j += stride) {
+    coordinates[i++] = flatCoordinates.slice(j, j + stride);
+  }
+  coordinates.length = i;
+  return coordinates;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<number>} ends Ends.
+ * @param {number} stride Stride.
+ * @param {Array.<Array.<ol.Coordinate>>=} opt_coordinatess Coordinatess.
+ * @return {Array.<Array.<ol.Coordinate>>} Coordinatess.
+ */
+ol.geom.flat.inflate.coordinatess =
+    function(flatCoordinates, offset, ends, stride, opt_coordinatess) {
+  var coordinatess = opt_coordinatess !== undefined ? opt_coordinatess : [];
+  var i = 0;
+  var j, jj;
+  for (j = 0, jj = ends.length; j < jj; ++j) {
+    var end = ends[j];
+    coordinatess[i++] = ol.geom.flat.inflate.coordinates(
+        flatCoordinates, offset, end, stride, coordinatess[i]);
+    offset = end;
+  }
+  coordinatess.length = i;
+  return coordinatess;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<Array.<number>>} endss Endss.
+ * @param {number} stride Stride.
+ * @param {Array.<Array.<Array.<ol.Coordinate>>>=} opt_coordinatesss
+ *     Coordinatesss.
+ * @return {Array.<Array.<Array.<ol.Coordinate>>>} Coordinatesss.
+ */
+ol.geom.flat.inflate.coordinatesss =
+    function(flatCoordinates, offset, endss, stride, opt_coordinatesss) {
+  var coordinatesss = opt_coordinatesss !== undefined ? opt_coordinatesss : [];
+  var i = 0;
+  var j, jj;
+  for (j = 0, jj = endss.length; j < jj; ++j) {
+    var ends = endss[j];
+    coordinatesss[i++] = ol.geom.flat.inflate.coordinatess(
+        flatCoordinates, offset, ends, stride, coordinatesss[i]);
+    offset = ends[ends.length - 1];
+  }
+  coordinatesss.length = i;
+  return coordinatesss;
+};
+
+// Based on simplify-js https://github.com/mourner/simplify-js
+// Copyright (c) 2012, Vladimir Agafonkin
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//    1. Redistributions of source code must retain the above copyright notice,
+//       this list of conditions and the following disclaimer.
+//
+//    2. Redistributions in binary form must reproduce the above copyright
+//       notice, this list of conditions and the following disclaimer in the
+//       documentation and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+
+goog.provide('ol.geom.flat.simplify');
+
+goog.require('ol.math');
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {number} squaredTolerance Squared tolerance.
+ * @param {boolean} highQuality Highest quality.
+ * @param {Array.<number>=} opt_simplifiedFlatCoordinates Simplified flat
+ *     coordinates.
+ * @return {Array.<number>} Simplified line string.
+ */
+ol.geom.flat.simplify.lineString = function(flatCoordinates, offset, end,
+    stride, squaredTolerance, highQuality, opt_simplifiedFlatCoordinates) {
+  var simplifiedFlatCoordinates = opt_simplifiedFlatCoordinates !== undefined ?
+      opt_simplifiedFlatCoordinates : [];
+  if (!highQuality) {
+    end = ol.geom.flat.simplify.radialDistance(flatCoordinates, offset, end,
+        stride, squaredTolerance,
+        simplifiedFlatCoordinates, 0);
+    flatCoordinates = simplifiedFlatCoordinates;
+    offset = 0;
+    stride = 2;
+  }
+  simplifiedFlatCoordinates.length = ol.geom.flat.simplify.douglasPeucker(
+      flatCoordinates, offset, end, stride, squaredTolerance,
+      simplifiedFlatCoordinates, 0);
+  return simplifiedFlatCoordinates;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {number} squaredTolerance Squared tolerance.
+ * @param {Array.<number>} simplifiedFlatCoordinates Simplified flat
+ *     coordinates.
+ * @param {number} simplifiedOffset Simplified offset.
+ * @return {number} Simplified offset.
+ */
+ol.geom.flat.simplify.douglasPeucker = function(flatCoordinates, offset, end,
+    stride, squaredTolerance, simplifiedFlatCoordinates, simplifiedOffset) {
+  var n = (end - offset) / stride;
+  if (n < 3) {
+    for (; offset < end; offset += stride) {
+      simplifiedFlatCoordinates[simplifiedOffset++] =
+          flatCoordinates[offset];
+      simplifiedFlatCoordinates[simplifiedOffset++] =
+          flatCoordinates[offset + 1];
+    }
+    return simplifiedOffset;
+  }
+  /** @type {Array.<number>} */
+  var markers = new Array(n);
+  markers[0] = 1;
+  markers[n - 1] = 1;
+  /** @type {Array.<number>} */
+  var stack = [offset, end - stride];
+  var index = 0;
+  var i;
+  while (stack.length > 0) {
+    var last = stack.pop();
+    var first = stack.pop();
+    var maxSquaredDistance = 0;
+    var x1 = flatCoordinates[first];
+    var y1 = flatCoordinates[first + 1];
+    var x2 = flatCoordinates[last];
+    var y2 = flatCoordinates[last + 1];
+    for (i = first + stride; i < last; i += stride) {
+      var x = flatCoordinates[i];
+      var y = flatCoordinates[i + 1];
+      var squaredDistance = ol.math.squaredSegmentDistance(
+          x, y, x1, y1, x2, y2);
+      if (squaredDistance > maxSquaredDistance) {
+        index = i;
+        maxSquaredDistance = squaredDistance;
+      }
+    }
+    if (maxSquaredDistance > squaredTolerance) {
+      markers[(index - offset) / stride] = 1;
+      if (first + stride < index) {
+        stack.push(first, index);
+      }
+      if (index + stride < last) {
+        stack.push(index, last);
+      }
+    }
+  }
+  for (i = 0; i < n; ++i) {
+    if (markers[i]) {
+      simplifiedFlatCoordinates[simplifiedOffset++] =
+          flatCoordinates[offset + i * stride];
+      simplifiedFlatCoordinates[simplifiedOffset++] =
+          flatCoordinates[offset + i * stride + 1];
+    }
+  }
+  return simplifiedOffset;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<number>} ends Ends.
+ * @param {number} stride Stride.
+ * @param {number} squaredTolerance Squared tolerance.
+ * @param {Array.<number>} simplifiedFlatCoordinates Simplified flat
+ *     coordinates.
+ * @param {number} simplifiedOffset Simplified offset.
+ * @param {Array.<number>} simplifiedEnds Simplified ends.
+ * @return {number} Simplified offset.
+ */
+ol.geom.flat.simplify.douglasPeuckers = function(flatCoordinates, offset,
+    ends, stride, squaredTolerance, simplifiedFlatCoordinates,
+    simplifiedOffset, simplifiedEnds) {
+  var i, ii;
+  for (i = 0, ii = ends.length; i < ii; ++i) {
+    var end = ends[i];
+    simplifiedOffset = ol.geom.flat.simplify.douglasPeucker(
+        flatCoordinates, offset, end, stride, squaredTolerance,
+        simplifiedFlatCoordinates, simplifiedOffset);
+    simplifiedEnds.push(simplifiedOffset);
+    offset = end;
+  }
+  return simplifiedOffset;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<Array.<number>>} endss Endss.
+ * @param {number} stride Stride.
+ * @param {number} squaredTolerance Squared tolerance.
+ * @param {Array.<number>} simplifiedFlatCoordinates Simplified flat
+ *     coordinates.
+ * @param {number} simplifiedOffset Simplified offset.
+ * @param {Array.<Array.<number>>} simplifiedEndss Simplified endss.
+ * @return {number} Simplified offset.
+ */
+ol.geom.flat.simplify.douglasPeuckerss = function(
+    flatCoordinates, offset, endss, stride, squaredTolerance,
+    simplifiedFlatCoordinates, simplifiedOffset, simplifiedEndss) {
+  var i, ii;
+  for (i = 0, ii = endss.length; i < ii; ++i) {
+    var ends = endss[i];
+    var simplifiedEnds = [];
+    simplifiedOffset = ol.geom.flat.simplify.douglasPeuckers(
+        flatCoordinates, offset, ends, stride, squaredTolerance,
+        simplifiedFlatCoordinates, simplifiedOffset, simplifiedEnds);
+    simplifiedEndss.push(simplifiedEnds);
+    offset = ends[ends.length - 1];
+  }
+  return simplifiedOffset;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {number} squaredTolerance Squared tolerance.
+ * @param {Array.<number>} simplifiedFlatCoordinates Simplified flat
+ *     coordinates.
+ * @param {number} simplifiedOffset Simplified offset.
+ * @return {number} Simplified offset.
+ */
+ol.geom.flat.simplify.radialDistance = function(flatCoordinates, offset, end,
+    stride, squaredTolerance, simplifiedFlatCoordinates, simplifiedOffset) {
+  if (end <= offset + stride) {
+    // zero or one point, no simplification possible, so copy and return
+    for (; offset < end; offset += stride) {
+      simplifiedFlatCoordinates[simplifiedOffset++] = flatCoordinates[offset];
+      simplifiedFlatCoordinates[simplifiedOffset++] =
+          flatCoordinates[offset + 1];
+    }
+    return simplifiedOffset;
+  }
+  var x1 = flatCoordinates[offset];
+  var y1 = flatCoordinates[offset + 1];
+  // copy first point
+  simplifiedFlatCoordinates[simplifiedOffset++] = x1;
+  simplifiedFlatCoordinates[simplifiedOffset++] = y1;
+  var x2 = x1;
+  var y2 = y1;
+  for (offset += stride; offset < end; offset += stride) {
+    x2 = flatCoordinates[offset];
+    y2 = flatCoordinates[offset + 1];
+    if (ol.math.squaredDistance(x1, y1, x2, y2) > squaredTolerance) {
+      // copy point at offset
+      simplifiedFlatCoordinates[simplifiedOffset++] = x2;
+      simplifiedFlatCoordinates[simplifiedOffset++] = y2;
+      x1 = x2;
+      y1 = y2;
+    }
+  }
+  if (x2 != x1 || y2 != y1) {
+    // copy last point
+    simplifiedFlatCoordinates[simplifiedOffset++] = x2;
+    simplifiedFlatCoordinates[simplifiedOffset++] = y2;
+  }
+  return simplifiedOffset;
+};
+
+
+/**
+ * @param {number} value Value.
+ * @param {number} tolerance Tolerance.
+ * @return {number} Rounded value.
+ */
+ol.geom.flat.simplify.snap = function(value, tolerance) {
+  return tolerance * Math.round(value / tolerance);
+};
+
+
+/**
+ * Simplifies a line string using an algorithm designed by Tim Schaub.
+ * Coordinates are snapped to the nearest value in a virtual grid and
+ * consecutive duplicate coordinates are discarded.  This effectively preserves
+ * topology as the simplification of any subsection of a line string is
+ * independent of the rest of the line string.  This means that, for examples,
+ * the common edge between two polygons will be simplified to the same line
+ * string independently in both polygons.  This implementation uses a single
+ * pass over the coordinates and eliminates intermediate collinear points.
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {number} tolerance Tolerance.
+ * @param {Array.<number>} simplifiedFlatCoordinates Simplified flat
+ *     coordinates.
+ * @param {number} simplifiedOffset Simplified offset.
+ * @return {number} Simplified offset.
+ */
+ol.geom.flat.simplify.quantize = function(flatCoordinates, offset, end, stride,
+    tolerance, simplifiedFlatCoordinates, simplifiedOffset) {
+  // do nothing if the line is empty
+  if (offset == end) {
+    return simplifiedOffset;
+  }
+  // snap the first coordinate (P1)
+  var x1 = ol.geom.flat.simplify.snap(flatCoordinates[offset], tolerance);
+  var y1 = ol.geom.flat.simplify.snap(flatCoordinates[offset + 1], tolerance);
+  offset += stride;
+  // add the first coordinate to the output
+  simplifiedFlatCoordinates[simplifiedOffset++] = x1;
+  simplifiedFlatCoordinates[simplifiedOffset++] = y1;
+  // find the next coordinate that does not snap to the same value as the first
+  // coordinate (P2)
+  var x2, y2;
+  do {
+    x2 = ol.geom.flat.simplify.snap(flatCoordinates[offset], tolerance);
+    y2 = ol.geom.flat.simplify.snap(flatCoordinates[offset + 1], tolerance);
+    offset += stride;
+    if (offset == end) {
+      // all coordinates snap to the same value, the line collapses to a point
+      // push the last snapped value anyway to ensure that the output contains
+      // at least two points
+      // FIXME should we really return at least two points anyway?
+      simplifiedFlatCoordinates[simplifiedOffset++] = x2;
+      simplifiedFlatCoordinates[simplifiedOffset++] = y2;
+      return simplifiedOffset;
+    }
+  } while (x2 == x1 && y2 == y1);
+  while (offset < end) {
+    var x3, y3;
+    // snap the next coordinate (P3)
+    x3 = ol.geom.flat.simplify.snap(flatCoordinates[offset], tolerance);
+    y3 = ol.geom.flat.simplify.snap(flatCoordinates[offset + 1], tolerance);
+    offset += stride;
+    // skip P3 if it is equal to P2
+    if (x3 == x2 && y3 == y2) {
+      continue;
+    }
+    // calculate the delta between P1 and P2
+    var dx1 = x2 - x1;
+    var dy1 = y2 - y1;
+    // calculate the delta between P3 and P1
+    var dx2 = x3 - x1;
+    var dy2 = y3 - y1;
+    // if P1, P2, and P3 are colinear and P3 is further from P1 than P2 is from
+    // P1 in the same direction then P2 is on the straight line between P1 and
+    // P3
+    if ((dx1 * dy2 == dy1 * dx2) &&
+        ((dx1 < 0 && dx2 < dx1) || dx1 == dx2 || (dx1 > 0 && dx2 > dx1)) &&
+        ((dy1 < 0 && dy2 < dy1) || dy1 == dy2 || (dy1 > 0 && dy2 > dy1))) {
+      // discard P2 and set P2 = P3
+      x2 = x3;
+      y2 = y3;
+      continue;
+    }
+    // either P1, P2, and P3 are not colinear, or they are colinear but P3 is
+    // between P3 and P1 or on the opposite half of the line to P2.  add P2,
+    // and continue with P1 = P2 and P2 = P3
+    simplifiedFlatCoordinates[simplifiedOffset++] = x2;
+    simplifiedFlatCoordinates[simplifiedOffset++] = y2;
+    x1 = x2;
+    y1 = y2;
+    x2 = x3;
+    y2 = y3;
+  }
+  // add the last point (P2)
+  simplifiedFlatCoordinates[simplifiedOffset++] = x2;
+  simplifiedFlatCoordinates[simplifiedOffset++] = y2;
+  return simplifiedOffset;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<number>} ends Ends.
+ * @param {number} stride Stride.
+ * @param {number} tolerance Tolerance.
+ * @param {Array.<number>} simplifiedFlatCoordinates Simplified flat
+ *     coordinates.
+ * @param {number} simplifiedOffset Simplified offset.
+ * @param {Array.<number>} simplifiedEnds Simplified ends.
+ * @return {number} Simplified offset.
+ */
+ol.geom.flat.simplify.quantizes = function(
+    flatCoordinates, offset, ends, stride,
+    tolerance,
+    simplifiedFlatCoordinates, simplifiedOffset, simplifiedEnds) {
+  var i, ii;
+  for (i = 0, ii = ends.length; i < ii; ++i) {
+    var end = ends[i];
+    simplifiedOffset = ol.geom.flat.simplify.quantize(
+        flatCoordinates, offset, end, stride,
+        tolerance,
+        simplifiedFlatCoordinates, simplifiedOffset);
+    simplifiedEnds.push(simplifiedOffset);
+    offset = end;
+  }
+  return simplifiedOffset;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<Array.<number>>} endss Endss.
+ * @param {number} stride Stride.
+ * @param {number} tolerance Tolerance.
+ * @param {Array.<number>} simplifiedFlatCoordinates Simplified flat
+ *     coordinates.
+ * @param {number} simplifiedOffset Simplified offset.
+ * @param {Array.<Array.<number>>} simplifiedEndss Simplified endss.
+ * @return {number} Simplified offset.
+ */
+ol.geom.flat.simplify.quantizess = function(
+    flatCoordinates, offset, endss, stride,
+    tolerance,
+    simplifiedFlatCoordinates, simplifiedOffset, simplifiedEndss) {
+  var i, ii;
+  for (i = 0, ii = endss.length; i < ii; ++i) {
+    var ends = endss[i];
+    var simplifiedEnds = [];
+    simplifiedOffset = ol.geom.flat.simplify.quantizes(
+        flatCoordinates, offset, ends, stride,
+        tolerance,
+        simplifiedFlatCoordinates, simplifiedOffset, simplifiedEnds);
+    simplifiedEndss.push(simplifiedEnds);
+    offset = ends[ends.length - 1];
+  }
+  return simplifiedOffset;
+};
+
+goog.provide('ol.geom.LinearRing');
+
+goog.require('ol.extent');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.GeometryType');
+goog.require('ol.geom.SimpleGeometry');
+goog.require('ol.geom.flat.area');
+goog.require('ol.geom.flat.closest');
+goog.require('ol.geom.flat.deflate');
+goog.require('ol.geom.flat.inflate');
+goog.require('ol.geom.flat.simplify');
+
+
+
+/**
+ * @classdesc
+ * Linear ring geometry. Only used as part of polygon; cannot be rendered
+ * on its own.
+ *
+ * @constructor
+ * @extends {ol.geom.SimpleGeometry}
+ * @param {Array.<ol.Coordinate>} coordinates Coordinates.
+ * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @api stable
+ */
+ol.geom.LinearRing = function(coordinates, opt_layout) {
+
+  goog.base(this);
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.maxDelta_ = -1;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.maxDeltaRevision_ = -1;
+
+  this.setCoordinates(coordinates, opt_layout);
+
+};
+goog.inherits(ol.geom.LinearRing, ol.geom.SimpleGeometry);
+
+
+/**
+ * Make a complete copy of the geometry.
+ * @return {!ol.geom.LinearRing} Clone.
+ * @api stable
+ */
+ol.geom.LinearRing.prototype.clone = function() {
+  var linearRing = new ol.geom.LinearRing(null);
+  linearRing.setFlatCoordinates(this.layout, this.flatCoordinates.slice());
+  return linearRing;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.LinearRing.prototype.closestPointXY =
+    function(x, y, closestPoint, minSquaredDistance) {
+  if (minSquaredDistance <
+      ol.extent.closestSquaredDistanceXY(this.getExtent(), x, y)) {
+    return minSquaredDistance;
+  }
+  if (this.maxDeltaRevision_ != this.getRevision()) {
+    this.maxDelta_ = Math.sqrt(ol.geom.flat.closest.getMaxSquaredDelta(
+        this.flatCoordinates, 0, this.flatCoordinates.length, this.stride, 0));
+    this.maxDeltaRevision_ = this.getRevision();
+  }
+  return ol.geom.flat.closest.getClosestPoint(
+      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
+      this.maxDelta_, true, x, y, closestPoint, minSquaredDistance);
+};
+
+
+/**
+ * Return the area of the linear ring on projected plane.
+ * @return {number} Area (on projected plane).
+ * @api stable
+ */
+ol.geom.LinearRing.prototype.getArea = function() {
+  return ol.geom.flat.area.linearRing(
+      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);
+};
+
+
+/**
+ * Return the coordinates of the linear ring.
+ * @return {Array.<ol.Coordinate>} Coordinates.
+ * @api stable
+ */
+ol.geom.LinearRing.prototype.getCoordinates = function() {
+  return ol.geom.flat.inflate.coordinates(
+      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.LinearRing.prototype.getSimplifiedGeometryInternal =
+    function(squaredTolerance) {
+  var simplifiedFlatCoordinates = [];
+  simplifiedFlatCoordinates.length = ol.geom.flat.simplify.douglasPeucker(
+      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
+      squaredTolerance, simplifiedFlatCoordinates, 0);
+  var simplifiedLinearRing = new ol.geom.LinearRing(null);
+  simplifiedLinearRing.setFlatCoordinates(
+      ol.geom.GeometryLayout.XY, simplifiedFlatCoordinates);
+  return simplifiedLinearRing;
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.LinearRing.prototype.getType = function() {
+  return ol.geom.GeometryType.LINEAR_RING;
+};
+
+
+/**
+ * Set the coordinates of the linear ring.
+ * @param {Array.<ol.Coordinate>} coordinates Coordinates.
+ * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @api stable
+ */
+ol.geom.LinearRing.prototype.setCoordinates =
+    function(coordinates, opt_layout) {
+  if (!coordinates) {
+    this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null);
+  } else {
+    this.setLayout(opt_layout, coordinates, 1);
+    if (!this.flatCoordinates) {
+      this.flatCoordinates = [];
+    }
+    this.flatCoordinates.length = ol.geom.flat.deflate.coordinates(
+        this.flatCoordinates, 0, coordinates, this.stride);
+    this.changed();
+  }
+};
+
+
+/**
+ * @param {ol.geom.GeometryLayout} layout Layout.
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ */
+ol.geom.LinearRing.prototype.setFlatCoordinates =
+    function(layout, flatCoordinates) {
+  this.setFlatCoordinatesInternal(layout, flatCoordinates);
+  this.changed();
+};
+
+goog.provide('ol.geom.Point');
+
+goog.require('ol.extent');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.GeometryType');
+goog.require('ol.geom.SimpleGeometry');
+goog.require('ol.geom.flat.deflate');
+goog.require('ol.math');
+
+
+
+/**
+ * @classdesc
+ * Point geometry.
+ *
+ * @constructor
+ * @extends {ol.geom.SimpleGeometry}
+ * @param {ol.Coordinate} coordinates Coordinates.
+ * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @api stable
+ */
+ol.geom.Point = function(coordinates, opt_layout) {
+  goog.base(this);
+  this.setCoordinates(coordinates, opt_layout);
+};
+goog.inherits(ol.geom.Point, ol.geom.SimpleGeometry);
+
+
+/**
+ * Make a complete copy of the geometry.
+ * @return {!ol.geom.Point} Clone.
+ * @api stable
+ */
+ol.geom.Point.prototype.clone = function() {
+  var point = new ol.geom.Point(null);
+  point.setFlatCoordinates(this.layout, this.flatCoordinates.slice());
+  return point;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.Point.prototype.closestPointXY =
+    function(x, y, closestPoint, minSquaredDistance) {
+  var flatCoordinates = this.flatCoordinates;
+  var squaredDistance = ol.math.squaredDistance(
+      x, y, flatCoordinates[0], flatCoordinates[1]);
+  if (squaredDistance < minSquaredDistance) {
+    var stride = this.stride;
+    var i;
+    for (i = 0; i < stride; ++i) {
+      closestPoint[i] = flatCoordinates[i];
+    }
+    closestPoint.length = stride;
+    return squaredDistance;
+  } else {
+    return minSquaredDistance;
+  }
+};
+
+
+/**
+ * Return the coordinate of the point.
+ * @return {ol.Coordinate} Coordinates.
+ * @api stable
+ */
+ol.geom.Point.prototype.getCoordinates = function() {
+  return !this.flatCoordinates ? [] : this.flatCoordinates.slice();
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.Point.prototype.computeExtent = function(extent) {
+  return ol.extent.createOrUpdateFromCoordinate(this.flatCoordinates, extent);
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.Point.prototype.getType = function() {
+  return ol.geom.GeometryType.POINT;
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.Point.prototype.intersectsExtent = function(extent) {
+  return ol.extent.containsXY(extent,
+      this.flatCoordinates[0], this.flatCoordinates[1]);
+};
+
+
+/**
+ * Set the coordinate of the point.
+ * @param {ol.Coordinate} coordinates Coordinates.
+ * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @api stable
+ */
+ol.geom.Point.prototype.setCoordinates = function(coordinates, opt_layout) {
+  if (!coordinates) {
+    this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null);
+  } else {
+    this.setLayout(opt_layout, coordinates, 0);
+    if (!this.flatCoordinates) {
+      this.flatCoordinates = [];
+    }
+    this.flatCoordinates.length = ol.geom.flat.deflate.coordinate(
+        this.flatCoordinates, 0, coordinates, this.stride);
+    this.changed();
+  }
+};
+
+
+/**
+ * @param {ol.geom.GeometryLayout} layout Layout.
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ */
+ol.geom.Point.prototype.setFlatCoordinates = function(layout, flatCoordinates) {
+  this.setFlatCoordinatesInternal(layout, flatCoordinates);
+  this.changed();
+};
+
+goog.provide('ol.geom.flat.contains');
+
+goog.require('goog.asserts');
+goog.require('ol.extent');
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {ol.Extent} extent Extent.
+ * @return {boolean} Contains extent.
+ */
+ol.geom.flat.contains.linearRingContainsExtent =
+    function(flatCoordinates, offset, end, stride, extent) {
+  var outside = ol.extent.forEachCorner(extent,
+      /**
+       * @param {ol.Coordinate} coordinate Coordinate.
+       */
+      function(coordinate) {
+        return !ol.geom.flat.contains.linearRingContainsXY(flatCoordinates,
+            offset, end, stride, coordinate[0], coordinate[1]);
+      });
+  return !outside;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {number} x X.
+ * @param {number} y Y.
+ * @return {boolean} Contains (x, y).
+ */
+ol.geom.flat.contains.linearRingContainsXY =
+    function(flatCoordinates, offset, end, stride, x, y) {
+  // http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html
+  var contains = false;
+  var x1 = flatCoordinates[end - stride];
+  var y1 = flatCoordinates[end - stride + 1];
+  for (; offset < end; offset += stride) {
+    var x2 = flatCoordinates[offset];
+    var y2 = flatCoordinates[offset + 1];
+    var intersect = ((y1 > y) != (y2 > y)) &&
+        (x < (x2 - x1) * (y - y1) / (y2 - y1) + x1);
+    if (intersect) {
+      contains = !contains;
+    }
+    x1 = x2;
+    y1 = y2;
+  }
+  return contains;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<number>} ends Ends.
+ * @param {number} stride Stride.
+ * @param {number} x X.
+ * @param {number} y Y.
+ * @return {boolean} Contains (x, y).
+ */
+ol.geom.flat.contains.linearRingsContainsXY =
+    function(flatCoordinates, offset, ends, stride, x, y) {
+  goog.asserts.assert(ends.length > 0, 'ends should not be an empty array');
+  if (ends.length === 0) {
+    return false;
+  }
+  if (!ol.geom.flat.contains.linearRingContainsXY(
+      flatCoordinates, offset, ends[0], stride, x, y)) {
+    return false;
+  }
+  var i, ii;
+  for (i = 1, ii = ends.length; i < ii; ++i) {
+    if (ol.geom.flat.contains.linearRingContainsXY(
+        flatCoordinates, ends[i - 1], ends[i], stride, x, y)) {
+      return false;
+    }
+  }
+  return true;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<Array.<number>>} endss Endss.
+ * @param {number} stride Stride.
+ * @param {number} x X.
+ * @param {number} y Y.
+ * @return {boolean} Contains (x, y).
+ */
+ol.geom.flat.contains.linearRingssContainsXY =
+    function(flatCoordinates, offset, endss, stride, x, y) {
+  goog.asserts.assert(endss.length > 0, 'endss should not be an empty array');
+  if (endss.length === 0) {
+    return false;
+  }
+  var i, ii;
+  for (i = 0, ii = endss.length; i < ii; ++i) {
+    var ends = endss[i];
+    if (ol.geom.flat.contains.linearRingsContainsXY(
+        flatCoordinates, offset, ends, stride, x, y)) {
+      return true;
+    }
+    offset = ends[ends.length - 1];
+  }
+  return false;
+};
+
+goog.provide('ol.geom.flat.interiorpoint');
+
+goog.require('goog.asserts');
+goog.require('ol.array');
+goog.require('ol.geom.flat.contains');
+
+
+/**
+ * Calculates a point that is likely to lie in the interior of the linear rings.
+ * Inspired by JTS's com.vividsolutions.jts.geom.Geometry#getInteriorPoint.
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<number>} ends Ends.
+ * @param {number} stride Stride.
+ * @param {Array.<number>} flatCenters Flat centers.
+ * @param {number} flatCentersOffset Flat center offset.
+ * @param {Array.<number>=} opt_dest Destination.
+ * @return {Array.<number>} Destination.
+ */
+ol.geom.flat.interiorpoint.linearRings = function(flatCoordinates, offset,
+    ends, stride, flatCenters, flatCentersOffset, opt_dest) {
+  var i, ii, x, x1, x2, y1, y2;
+  var y = flatCenters[flatCentersOffset + 1];
+  /** @type {Array.<number>} */
+  var intersections = [];
+  // Calculate intersections with the horizontal line
+  var end = ends[0];
+  x1 = flatCoordinates[end - stride];
+  y1 = flatCoordinates[end - stride + 1];
+  for (i = offset; i < end; i += stride) {
+    x2 = flatCoordinates[i];
+    y2 = flatCoordinates[i + 1];
+    if ((y <= y1 && y2 <= y) || (y1 <= y && y <= y2)) {
+      x = (y - y1) / (y2 - y1) * (x2 - x1) + x1;
+      intersections.push(x);
+    }
+    x1 = x2;
+    y1 = y2;
+  }
+  // Find the longest segment of the horizontal line that has its center point
+  // inside the linear ring.
+  var pointX = NaN;
+  var maxSegmentLength = -Infinity;
+  intersections.sort(ol.array.numberSafeCompareFunction);
+  x1 = intersections[0];
+  for (i = 1, ii = intersections.length; i < ii; ++i) {
+    x2 = intersections[i];
+    var segmentLength = Math.abs(x2 - x1);
+    if (segmentLength > maxSegmentLength) {
+      x = (x1 + x2) / 2;
+      if (ol.geom.flat.contains.linearRingsContainsXY(
+          flatCoordinates, offset, ends, stride, x, y)) {
+        pointX = x;
+        maxSegmentLength = segmentLength;
+      }
+    }
+    x1 = x2;
+  }
+  if (isNaN(pointX)) {
+    // There is no horizontal line that has its center point inside the linear
+    // ring.  Use the center of the the linear ring's extent.
+    pointX = flatCenters[flatCentersOffset];
+  }
+  if (opt_dest) {
+    opt_dest.push(pointX, y);
+    return opt_dest;
+  } else {
+    return [pointX, y];
+  }
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<Array.<number>>} endss Endss.
+ * @param {number} stride Stride.
+ * @param {Array.<number>} flatCenters Flat centers.
+ * @return {Array.<number>} Interior points.
+ */
+ol.geom.flat.interiorpoint.linearRingss =
+    function(flatCoordinates, offset, endss, stride, flatCenters) {
+  goog.asserts.assert(2 * endss.length == flatCenters.length,
+      'endss.length times 2 should be flatCenters.length');
+  var interiorPoints = [];
+  var i, ii;
+  for (i = 0, ii = endss.length; i < ii; ++i) {
+    var ends = endss[i];
+    interiorPoints = ol.geom.flat.interiorpoint.linearRings(flatCoordinates,
+        offset, ends, stride, flatCenters, 2 * i, interiorPoints);
+    offset = ends[ends.length - 1];
+  }
+  return interiorPoints;
+};
+
+goog.provide('ol.geom.flat.segments');
+
+
+/**
+ * This function calls `callback` for each segment of the flat coordinates
+ * array. If the callback returns a truthy value the function returns that
+ * value immediately. Otherwise the function returns `false`.
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {function(this: S, ol.Coordinate, ol.Coordinate): T} callback Function
+ *     called for each segment.
+ * @param {S=} opt_this The object to be used as the value of 'this'
+ *     within callback.
+ * @return {T|boolean} Value.
+ * @template T,S
+ */
+ol.geom.flat.segments.forEach =
+    function(flatCoordinates, offset, end, stride, callback, opt_this) {
+  var point1 = [flatCoordinates[offset], flatCoordinates[offset + 1]];
+  var point2 = [];
+  var ret;
+  for (; (offset + stride) < end; offset += stride) {
+    point2[0] = flatCoordinates[offset + stride];
+    point2[1] = flatCoordinates[offset + stride + 1];
+    ret = callback.call(opt_this, point1, point2);
+    if (ret) {
+      return ret;
+    }
+    point1[0] = point2[0];
+    point1[1] = point2[1];
+  }
+  return false;
+};
+
+goog.provide('ol.geom.flat.intersectsextent');
+
+goog.require('goog.asserts');
+goog.require('ol.extent');
+goog.require('ol.geom.flat.contains');
+goog.require('ol.geom.flat.segments');
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {ol.Extent} extent Extent.
+ * @return {boolean} True if the geometry and the extent intersect.
+ */
+ol.geom.flat.intersectsextent.lineString =
+    function(flatCoordinates, offset, end, stride, extent) {
+  var coordinatesExtent = ol.extent.extendFlatCoordinates(
+      ol.extent.createEmpty(), flatCoordinates, offset, end, stride);
+  if (!ol.extent.intersects(extent, coordinatesExtent)) {
+    return false;
+  }
+  if (ol.extent.containsExtent(extent, coordinatesExtent)) {
+    return true;
+  }
+  if (coordinatesExtent[0] >= extent[0] &&
+      coordinatesExtent[2] <= extent[2]) {
+    return true;
+  }
+  if (coordinatesExtent[1] >= extent[1] &&
+      coordinatesExtent[3] <= extent[3]) {
+    return true;
+  }
+  return ol.geom.flat.segments.forEach(flatCoordinates, offset, end, stride,
+      /**
+       * @param {ol.Coordinate} point1 Start point.
+       * @param {ol.Coordinate} point2 End point.
+       * @return {boolean} `true` if the segment and the extent intersect,
+       *     `false` otherwise.
+       */
+      function(point1, point2) {
+        return ol.extent.intersectsSegment(extent, point1, point2);
+      });
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<number>} ends Ends.
+ * @param {number} stride Stride.
+ * @param {ol.Extent} extent Extent.
+ * @return {boolean} True if the geometry and the extent intersect.
+ */
+ol.geom.flat.intersectsextent.lineStrings =
+    function(flatCoordinates, offset, ends, stride, extent) {
+  var i, ii;
+  for (i = 0, ii = ends.length; i < ii; ++i) {
+    if (ol.geom.flat.intersectsextent.lineString(
+        flatCoordinates, offset, ends[i], stride, extent)) {
+      return true;
+    }
+    offset = ends[i];
+  }
+  return false;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {ol.Extent} extent Extent.
+ * @return {boolean} True if the geometry and the extent intersect.
+ */
+ol.geom.flat.intersectsextent.linearRing =
+    function(flatCoordinates, offset, end, stride, extent) {
+  if (ol.geom.flat.intersectsextent.lineString(
+      flatCoordinates, offset, end, stride, extent)) {
+    return true;
+  }
+  if (ol.geom.flat.contains.linearRingContainsXY(
+      flatCoordinates, offset, end, stride, extent[0], extent[1])) {
+    return true;
+  }
+  if (ol.geom.flat.contains.linearRingContainsXY(
+      flatCoordinates, offset, end, stride, extent[0], extent[3])) {
+    return true;
+  }
+  if (ol.geom.flat.contains.linearRingContainsXY(
+      flatCoordinates, offset, end, stride, extent[2], extent[1])) {
+    return true;
+  }
+  if (ol.geom.flat.contains.linearRingContainsXY(
+      flatCoordinates, offset, end, stride, extent[2], extent[3])) {
+    return true;
+  }
+  return false;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<number>} ends Ends.
+ * @param {number} stride Stride.
+ * @param {ol.Extent} extent Extent.
+ * @return {boolean} True if the geometry and the extent intersect.
+ */
+ol.geom.flat.intersectsextent.linearRings =
+    function(flatCoordinates, offset, ends, stride, extent) {
+  goog.asserts.assert(ends.length > 0, 'ends should not be an empty array');
+  if (!ol.geom.flat.intersectsextent.linearRing(
+      flatCoordinates, offset, ends[0], stride, extent)) {
+    return false;
+  }
+  if (ends.length === 1) {
+    return true;
+  }
+  var i, ii;
+  for (i = 1, ii = ends.length; i < ii; ++i) {
+    if (ol.geom.flat.contains.linearRingContainsExtent(
+        flatCoordinates, ends[i - 1], ends[i], stride, extent)) {
+      return false;
+    }
+  }
+  return true;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<Array.<number>>} endss Endss.
+ * @param {number} stride Stride.
+ * @param {ol.Extent} extent Extent.
+ * @return {boolean} True if the geometry and the extent intersect.
+ */
+ol.geom.flat.intersectsextent.linearRingss =
+    function(flatCoordinates, offset, endss, stride, extent) {
+  goog.asserts.assert(endss.length > 0, 'endss should not be an empty array');
+  var i, ii;
+  for (i = 0, ii = endss.length; i < ii; ++i) {
+    var ends = endss[i];
+    if (ol.geom.flat.intersectsextent.linearRings(
+        flatCoordinates, offset, ends, stride, extent)) {
+      return true;
+    }
+    offset = ends[ends.length - 1];
+  }
+  return false;
+};
+
+goog.provide('ol.geom.flat.reverse');
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ */
+ol.geom.flat.reverse.coordinates =
+    function(flatCoordinates, offset, end, stride) {
+  while (offset < end - stride) {
+    var i;
+    for (i = 0; i < stride; ++i) {
+      var tmp = flatCoordinates[offset + i];
+      flatCoordinates[offset + i] = flatCoordinates[end - stride + i];
+      flatCoordinates[end - stride + i] = tmp;
+    }
+    offset += stride;
+    end -= stride;
+  }
+};
+
+goog.provide('ol.geom.flat.orient');
+
+goog.require('ol');
+goog.require('ol.geom.flat.reverse');
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @return {boolean} Is clockwise.
+ */
+ol.geom.flat.orient.linearRingIsClockwise =
+    function(flatCoordinates, offset, end, stride) {
+  // http://tinyurl.com/clockwise-method
+  // https://github.com/OSGeo/gdal/blob/trunk/gdal/ogr/ogrlinearring.cpp
+  var edge = 0;
+  var x1 = flatCoordinates[end - stride];
+  var y1 = flatCoordinates[end - stride + 1];
+  for (; offset < end; offset += stride) {
+    var x2 = flatCoordinates[offset];
+    var y2 = flatCoordinates[offset + 1];
+    edge += (x2 - x1) * (y2 + y1);
+    x1 = x2;
+    y1 = y2;
+  }
+  return edge > 0;
+};
+
+
+/**
+ * Determines if linear rings are oriented.  By default, left-hand orientation
+ * is tested (first ring must be clockwise, remaining rings counter-clockwise).
+ * To test for right-hand orientation, use the `opt_right` argument.
+ *
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<number>} ends Array of end indexes.
+ * @param {number} stride Stride.
+ * @param {boolean=} opt_right Test for right-hand orientation
+ *     (counter-clockwise exterior ring and clockwise interior rings).
+ * @return {boolean} Rings are correctly oriented.
+ */
+ol.geom.flat.orient.linearRingsAreOriented =
+    function(flatCoordinates, offset, ends, stride, opt_right) {
+  var right = opt_right !== undefined ? opt_right : false;
+  var i, ii;
+  for (i = 0, ii = ends.length; i < ii; ++i) {
+    var end = ends[i];
+    var isClockwise = ol.geom.flat.orient.linearRingIsClockwise(
+        flatCoordinates, offset, end, stride);
+    if (i === 0) {
+      if ((right && isClockwise) || (!right && !isClockwise)) {
+        return false;
+      }
+    } else {
+      if ((right && !isClockwise) || (!right && isClockwise)) {
+        return false;
+      }
+    }
+    offset = end;
+  }
+  return true;
+};
+
+
+/**
+ * Determines if linear rings are oriented.  By default, left-hand orientation
+ * is tested (first ring must be clockwise, remaining rings counter-clockwise).
+ * To test for right-hand orientation, use the `opt_right` argument.
+ *
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<Array.<number>>} endss Array of array of end indexes.
+ * @param {number} stride Stride.
+ * @param {boolean=} opt_right Test for right-hand orientation
+ *     (counter-clockwise exterior ring and clockwise interior rings).
+ * @return {boolean} Rings are correctly oriented.
+ */
+ol.geom.flat.orient.linearRingssAreOriented =
+    function(flatCoordinates, offset, endss, stride, opt_right) {
+  var i, ii;
+  for (i = 0, ii = endss.length; i < ii; ++i) {
+    if (!ol.geom.flat.orient.linearRingsAreOriented(
+        flatCoordinates, offset, endss[i], stride, opt_right)) {
+      return false;
+    }
+  }
+  return true;
+};
+
+
+/**
+ * Orient coordinates in a flat array of linear rings.  By default, rings
+ * are oriented following the left-hand rule (clockwise for exterior and
+ * counter-clockwise for interior rings).  To orient according to the
+ * right-hand rule, use the `opt_right` argument.
+ *
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<number>} ends Ends.
+ * @param {number} stride Stride.
+ * @param {boolean=} opt_right Follow the right-hand rule for orientation.
+ * @return {number} End.
+ */
+ol.geom.flat.orient.orientLinearRings =
+    function(flatCoordinates, offset, ends, stride, opt_right) {
+  var right = opt_right !== undefined ? opt_right : false;
+  var i, ii;
+  for (i = 0, ii = ends.length; i < ii; ++i) {
+    var end = ends[i];
+    var isClockwise = ol.geom.flat.orient.linearRingIsClockwise(
+        flatCoordinates, offset, end, stride);
+    var reverse = i === 0 ?
+        (right && isClockwise) || (!right && !isClockwise) :
+        (right && !isClockwise) || (!right && isClockwise);
+    if (reverse) {
+      ol.geom.flat.reverse.coordinates(flatCoordinates, offset, end, stride);
+    }
+    offset = end;
+  }
+  return offset;
+};
+
+
+/**
+ * Orient coordinates in a flat array of linear rings.  By default, rings
+ * are oriented following the left-hand rule (clockwise for exterior and
+ * counter-clockwise for interior rings).  To orient according to the
+ * right-hand rule, use the `opt_right` argument.
+ *
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<Array.<number>>} endss Array of array of end indexes.
+ * @param {number} stride Stride.
+ * @param {boolean=} opt_right Follow the right-hand rule for orientation.
+ * @return {number} End.
+ */
+ol.geom.flat.orient.orientLinearRingss =
+    function(flatCoordinates, offset, endss, stride, opt_right) {
+  var i, ii;
+  for (i = 0, ii = endss.length; i < ii; ++i) {
+    offset = ol.geom.flat.orient.orientLinearRings(
+        flatCoordinates, offset, endss[i], stride, opt_right);
+  }
+  return offset;
+};
+
+goog.provide('ol.geom.Polygon');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.math');
+goog.require('ol');
+goog.require('ol.extent');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.GeometryType');
+goog.require('ol.geom.LinearRing');
+goog.require('ol.geom.Point');
+goog.require('ol.geom.SimpleGeometry');
+goog.require('ol.geom.flat.area');
+goog.require('ol.geom.flat.closest');
+goog.require('ol.geom.flat.contains');
+goog.require('ol.geom.flat.deflate');
+goog.require('ol.geom.flat.inflate');
+goog.require('ol.geom.flat.interiorpoint');
+goog.require('ol.geom.flat.intersectsextent');
+goog.require('ol.geom.flat.orient');
+goog.require('ol.geom.flat.simplify');
+
+
+
+/**
+ * @classdesc
+ * Polygon geometry.
+ *
+ * @constructor
+ * @extends {ol.geom.SimpleGeometry}
+ * @param {Array.<Array.<ol.Coordinate>>} coordinates Coordinates.
+ * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @api stable
+ */
+ol.geom.Polygon = function(coordinates, opt_layout) {
+
+  goog.base(this);
+
+  /**
+   * @type {Array.<number>}
+   * @private
+   */
+  this.ends_ = [];
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.flatInteriorPointRevision_ = -1;
+
+  /**
+   * @private
+   * @type {ol.Coordinate}
+   */
+  this.flatInteriorPoint_ = null;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.maxDelta_ = -1;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.maxDeltaRevision_ = -1;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.orientedRevision_ = -1;
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.orientedFlatCoordinates_ = null;
+
+  this.setCoordinates(coordinates, opt_layout);
+
+};
+goog.inherits(ol.geom.Polygon, ol.geom.SimpleGeometry);
+
+
+/**
+ * Append the passed linear ring to this polygon.
+ * @param {ol.geom.LinearRing} linearRing Linear ring.
+ * @api stable
+ */
+ol.geom.Polygon.prototype.appendLinearRing = function(linearRing) {
+  goog.asserts.assert(linearRing.getLayout() == this.layout,
+      'layout of linearRing should match layout');
+  if (!this.flatCoordinates) {
+    this.flatCoordinates = linearRing.getFlatCoordinates().slice();
+  } else {
+    goog.array.extend(this.flatCoordinates, linearRing.getFlatCoordinates());
+  }
+  this.ends_.push(this.flatCoordinates.length);
+  this.changed();
+};
+
+
+/**
+ * Make a complete copy of the geometry.
+ * @return {!ol.geom.Polygon} Clone.
+ * @api stable
+ */
+ol.geom.Polygon.prototype.clone = function() {
+  var polygon = new ol.geom.Polygon(null);
+  polygon.setFlatCoordinates(
+      this.layout, this.flatCoordinates.slice(), this.ends_.slice());
+  return polygon;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.Polygon.prototype.closestPointXY =
+    function(x, y, closestPoint, minSquaredDistance) {
+  if (minSquaredDistance <
+      ol.extent.closestSquaredDistanceXY(this.getExtent(), x, y)) {
+    return minSquaredDistance;
+  }
+  if (this.maxDeltaRevision_ != this.getRevision()) {
+    this.maxDelta_ = Math.sqrt(ol.geom.flat.closest.getsMaxSquaredDelta(
+        this.flatCoordinates, 0, this.ends_, this.stride, 0));
+    this.maxDeltaRevision_ = this.getRevision();
+  }
+  return ol.geom.flat.closest.getsClosestPoint(
+      this.flatCoordinates, 0, this.ends_, this.stride,
+      this.maxDelta_, true, x, y, closestPoint, minSquaredDistance);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.Polygon.prototype.containsXY = function(x, y) {
+  return ol.geom.flat.contains.linearRingsContainsXY(
+      this.getOrientedFlatCoordinates(), 0, this.ends_, this.stride, x, y);
+};
+
+
+/**
+ * Return the area of the polygon on projected plane.
+ * @return {number} Area (on projected plane).
+ * @api stable
+ */
+ol.geom.Polygon.prototype.getArea = function() {
+  return ol.geom.flat.area.linearRings(
+      this.getOrientedFlatCoordinates(), 0, this.ends_, this.stride);
+};
+
+
+/**
+ * Get the coordinate array for this geometry.  This array has the structure
+ * of a GeoJSON coordinate array for polygons.
+ *
+ * @param {boolean=} opt_right Orient coordinates according to the right-hand
+ *     rule (counter-clockwise for exterior and clockwise for interior rings).
+ *     If `false`, coordinates will be oriented according to the left-hand rule
+ *     (clockwise for exterior and counter-clockwise for interior rings).
+ *     By default, coordinate orientation will depend on how the geometry was
+ *     constructed.
+ * @return {Array.<Array.<ol.Coordinate>>} Coordinates.
+ * @api stable
+ */
+ol.geom.Polygon.prototype.getCoordinates = function(opt_right) {
+  var flatCoordinates;
+  if (opt_right !== undefined) {
+    flatCoordinates = this.getOrientedFlatCoordinates().slice();
+    ol.geom.flat.orient.orientLinearRings(
+        flatCoordinates, 0, this.ends_, this.stride, opt_right);
+  } else {
+    flatCoordinates = this.flatCoordinates;
+  }
+
+  return ol.geom.flat.inflate.coordinatess(
+      flatCoordinates, 0, this.ends_, this.stride);
+};
+
+
+/**
+ * @return {Array.<number>} Ends.
+ */
+ol.geom.Polygon.prototype.getEnds = function() {
+  return this.ends_;
+};
+
+
+/**
+ * @return {Array.<number>} Interior point.
+ */
+ol.geom.Polygon.prototype.getFlatInteriorPoint = function() {
+  if (this.flatInteriorPointRevision_ != this.getRevision()) {
+    var flatCenter = ol.extent.getCenter(this.getExtent());
+    this.flatInteriorPoint_ = ol.geom.flat.interiorpoint.linearRings(
+        this.getOrientedFlatCoordinates(), 0, this.ends_, this.stride,
+        flatCenter, 0);
+    this.flatInteriorPointRevision_ = this.getRevision();
+  }
+  return this.flatInteriorPoint_;
+};
+
+
+/**
+ * Return an interior point of the polygon.
+ * @return {ol.geom.Point} Interior point.
+ * @api stable
+ */
+ol.geom.Polygon.prototype.getInteriorPoint = function() {
+  return new ol.geom.Point(this.getFlatInteriorPoint());
+};
+
+
+/**
+ * Return the number of rings of the polygon,  this includes the exterior
+ * ring and any interior rings.
+ *
+ * @return {number} Number of rings.
+ * @api
+ */
+ol.geom.Polygon.prototype.getLinearRingCount = function() {
+  return this.ends_.length;
+};
+
+
+/**
+ * Return the Nth linear ring of the polygon geometry. Return `null` if the
+ * given index is out of range.
+ * The exterior linear ring is available at index `0` and the interior rings
+ * at index `1` and beyond.
+ *
+ * @param {number} index Index.
+ * @return {ol.geom.LinearRing} Linear ring.
+ * @api stable
+ */
+ol.geom.Polygon.prototype.getLinearRing = function(index) {
+  goog.asserts.assert(0 <= index && index < this.ends_.length,
+      'index should be in between 0 and and length of this.ends_');
+  if (index < 0 || this.ends_.length <= index) {
+    return null;
+  }
+  var linearRing = new ol.geom.LinearRing(null);
+  linearRing.setFlatCoordinates(this.layout, this.flatCoordinates.slice(
+      index === 0 ? 0 : this.ends_[index - 1], this.ends_[index]));
+  return linearRing;
+};
+
+
+/**
+ * Return the linear rings of the polygon.
+ * @return {Array.<ol.geom.LinearRing>} Linear rings.
+ * @api stable
+ */
+ol.geom.Polygon.prototype.getLinearRings = function() {
+  var layout = this.layout;
+  var flatCoordinates = this.flatCoordinates;
+  var ends = this.ends_;
+  var linearRings = [];
+  var offset = 0;
+  var i, ii;
+  for (i = 0, ii = ends.length; i < ii; ++i) {
+    var end = ends[i];
+    var linearRing = new ol.geom.LinearRing(null);
+    linearRing.setFlatCoordinates(layout, flatCoordinates.slice(offset, end));
+    linearRings.push(linearRing);
+    offset = end;
+  }
+  return linearRings;
+};
+
+
+/**
+ * @return {Array.<number>} Oriented flat coordinates.
+ */
+ol.geom.Polygon.prototype.getOrientedFlatCoordinates = function() {
+  if (this.orientedRevision_ != this.getRevision()) {
+    var flatCoordinates = this.flatCoordinates;
+    if (ol.geom.flat.orient.linearRingsAreOriented(
+        flatCoordinates, 0, this.ends_, this.stride)) {
+      this.orientedFlatCoordinates_ = flatCoordinates;
+    } else {
+      this.orientedFlatCoordinates_ = flatCoordinates.slice();
+      this.orientedFlatCoordinates_.length =
+          ol.geom.flat.orient.orientLinearRings(
+              this.orientedFlatCoordinates_, 0, this.ends_, this.stride);
+    }
+    this.orientedRevision_ = this.getRevision();
+  }
+  return this.orientedFlatCoordinates_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.Polygon.prototype.getSimplifiedGeometryInternal =
+    function(squaredTolerance) {
+  var simplifiedFlatCoordinates = [];
+  var simplifiedEnds = [];
+  simplifiedFlatCoordinates.length = ol.geom.flat.simplify.quantizes(
+      this.flatCoordinates, 0, this.ends_, this.stride,
+      Math.sqrt(squaredTolerance),
+      simplifiedFlatCoordinates, 0, simplifiedEnds);
+  var simplifiedPolygon = new ol.geom.Polygon(null);
+  simplifiedPolygon.setFlatCoordinates(
+      ol.geom.GeometryLayout.XY, simplifiedFlatCoordinates, simplifiedEnds);
+  return simplifiedPolygon;
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.Polygon.prototype.getType = function() {
+  return ol.geom.GeometryType.POLYGON;
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.Polygon.prototype.intersectsExtent = function(extent) {
+  return ol.geom.flat.intersectsextent.linearRings(
+      this.getOrientedFlatCoordinates(), 0, this.ends_, this.stride, extent);
+};
+
+
+/**
+ * Set the coordinates of the polygon.
+ * @param {Array.<Array.<ol.Coordinate>>} coordinates Coordinates.
+ * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @api stable
+ */
+ol.geom.Polygon.prototype.setCoordinates = function(coordinates, opt_layout) {
+  if (!coordinates) {
+    this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null, this.ends_);
+  } else {
+    this.setLayout(opt_layout, coordinates, 2);
+    if (!this.flatCoordinates) {
+      this.flatCoordinates = [];
+    }
+    var ends = ol.geom.flat.deflate.coordinatess(
+        this.flatCoordinates, 0, coordinates, this.stride, this.ends_);
+    this.flatCoordinates.length = ends.length === 0 ? 0 : ends[ends.length - 1];
+    this.changed();
+  }
+};
+
+
+/**
+ * @param {ol.geom.GeometryLayout} layout Layout.
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {Array.<number>} ends Ends.
+ */
+ol.geom.Polygon.prototype.setFlatCoordinates =
+    function(layout, flatCoordinates, ends) {
+  if (!flatCoordinates) {
+    goog.asserts.assert(ends && ends.length === 0,
+        'ends must be an empty array');
+  } else if (ends.length === 0) {
+    goog.asserts.assert(flatCoordinates.length === 0,
+        'flatCoordinates should be an empty array');
+  } else {
+    goog.asserts.assert(flatCoordinates.length == ends[ends.length - 1],
+        'the length of flatCoordinates should be the last entry of ends');
+  }
+  this.setFlatCoordinatesInternal(layout, flatCoordinates);
+  this.ends_ = ends;
+  this.changed();
+};
+
+
+/**
+ * Create an approximation of a circle on the surface of a sphere.
+ * @param {ol.Sphere} sphere The sphere.
+ * @param {ol.Coordinate} center Center (`[lon, lat]` in degrees).
+ * @param {number} radius The great-circle distance from the center to
+ *     the polygon vertices.
+ * @param {number=} opt_n Optional number of vertices for the resulting
+ *     polygon. Default is `32`.
+ * @return {ol.geom.Polygon} The "circular" polygon.
+ * @api stable
+ */
+ol.geom.Polygon.circular = function(sphere, center, radius, opt_n) {
+  var n = opt_n ? opt_n : 32;
+  /** @type {Array.<number>} */
+  var flatCoordinates = [];
+  var i;
+  for (i = 0; i < n; ++i) {
+    goog.array.extend(
+        flatCoordinates, sphere.offset(center, radius, 2 * Math.PI * i / n));
+  }
+  flatCoordinates.push(flatCoordinates[0], flatCoordinates[1]);
+  var polygon = new ol.geom.Polygon(null);
+  polygon.setFlatCoordinates(
+      ol.geom.GeometryLayout.XY, flatCoordinates, [flatCoordinates.length]);
+  return polygon;
+};
+
+
+/**
+ * Create a polygon from an extent. The layout used is `XY`.
+ * @param {ol.Extent} extent The extent.
+ * @return {ol.geom.Polygon} The polygon.
+ * @api
+ */
+ol.geom.Polygon.fromExtent = function(extent) {
+  var minX = extent[0];
+  var minY = extent[1];
+  var maxX = extent[2];
+  var maxY = extent[3];
+  var flatCoordinates =
+      [minX, minY, minX, maxY, maxX, maxY, maxX, minY, minX, minY];
+  var polygon = new ol.geom.Polygon(null);
+  polygon.setFlatCoordinates(
+      ol.geom.GeometryLayout.XY, flatCoordinates, [flatCoordinates.length]);
+  return polygon;
+};
+
+
+/**
+ * Create a regular polygon from a circle.
+ * @param {ol.geom.Circle} circle Circle geometry.
+ * @param {number=} opt_sides Number of sides of the polygon. Default is 32.
+ * @param {number=} opt_angle Start angle for the first vertex of the polygon in
+ *     radians. Default is 0.
+ * @return {ol.geom.Polygon} Polygon geometry.
+ * @api
+ */
+ol.geom.Polygon.fromCircle = function(circle, opt_sides, opt_angle) {
+  var sides = opt_sides ? opt_sides : 32;
+  var stride = circle.getStride();
+  var layout = circle.getLayout();
+  var polygon = new ol.geom.Polygon(null, layout);
+  var flatCoordinates = goog.array.repeat(0, stride * (sides + 1));
+  var ends = [flatCoordinates.length];
+  polygon.setFlatCoordinates(layout, flatCoordinates, ends);
+  ol.geom.Polygon.makeRegular(
+      polygon, circle.getCenter(), circle.getRadius(), opt_angle);
+  return polygon;
+};
+
+
+/**
+ * Modify the coordinates of a polygon to make it a regular polygon.
+ * @param {ol.geom.Polygon} polygon Polygon geometry.
+ * @param {ol.Coordinate} center Center of the regular polygon.
+ * @param {number} radius Radius of the regular polygon.
+ * @param {number=} opt_angle Start angle for the first vertex of the polygon in
+ *     radians. Default is 0.
+ */
+ol.geom.Polygon.makeRegular = function(polygon, center, radius, opt_angle) {
+  var flatCoordinates = polygon.getFlatCoordinates();
+  var layout = polygon.getLayout();
+  var stride = polygon.getStride();
+  var ends = polygon.getEnds();
+  goog.asserts.assert(ends.length === 1, 'only 1 ring is supported');
+  var sides = flatCoordinates.length / stride - 1;
+  var startAngle = opt_angle ? opt_angle : 0;
+  var angle, offset;
+  for (var i = 0; i <= sides; ++i) {
+    offset = i * stride;
+    angle = startAngle + (goog.math.modulo(i, sides) * 2 * Math.PI / sides);
+    flatCoordinates[offset] = center[0] + (radius * Math.cos(angle));
+    flatCoordinates[offset + 1] = center[1] + (radius * Math.sin(angle));
+  }
+  polygon.setFlatCoordinates(layout, flatCoordinates, ends);
+};
+
+goog.provide('ol.View');
+goog.provide('ol.ViewHint');
+goog.provide('ol.ViewProperty');
+
+goog.require('goog.asserts');
+goog.require('ol');
+goog.require('ol.CenterConstraint');
+goog.require('ol.Constraints');
+goog.require('ol.Object');
+goog.require('ol.ResolutionConstraint');
+goog.require('ol.RotationConstraint');
+goog.require('ol.RotationConstraintType');
+goog.require('ol.Size');
+goog.require('ol.coordinate');
+goog.require('ol.extent');
+goog.require('ol.geom.Polygon');
+goog.require('ol.geom.SimpleGeometry');
+goog.require('ol.proj');
+goog.require('ol.proj.METERS_PER_UNIT');
+goog.require('ol.proj.Projection');
+goog.require('ol.proj.Units');
+
+
+/**
+ * @enum {string}
+ */
+ol.ViewProperty = {
+  CENTER: 'center',
+  RESOLUTION: 'resolution',
+  ROTATION: 'rotation'
+};
+
+
+/**
+ * @enum {number}
+ */
+ol.ViewHint = {
+  ANIMATING: 0,
+  INTERACTING: 1
+};
+
+
+
+/**
+ * @classdesc
+ * An ol.View object represents a simple 2D view of the map.
+ *
+ * This is the object to act upon to change the center, resolution,
+ * and rotation of the map.
+ *
+ * ### The view states
+ *
+ * An `ol.View` is determined by three states: `center`, `resolution`,
+ * and `rotation`. Each state has a corresponding getter and setter, e.g.
+ * `getCenter` and `setCenter` for the `center` state.
+ *
+ * An `ol.View` has a `projection`. The projection determines the
+ * coordinate system of the center, and its units determine the units of the
+ * resolution (projection units per pixel). The default projection is
+ * Spherical Mercator (EPSG:3857).
+ *
+ * ### The constraints
+ *
+ * `setCenter`, `setResolution` and `setRotation` can be used to change the
+ * states of the view. Any value can be passed to the setters. And the value
+ * that is passed to a setter will effectively be the value set in the view,
+ * and returned by the corresponding getter.
+ *
+ * But an `ol.View` object also has a *resolution constraint*, a
+ * *rotation constraint* and a *center constraint*.
+ *
+ * As said above, no constraints are applied when the setters are used to set
+ * new states for the view. Applying constraints is done explicitly through
+ * the use of the `constrain*` functions (`constrainResolution` and
+ * `constrainRotation` and `constrainCenter`).
+ *
+ * The main users of the constraints are the interactions and the
+ * controls. For example, double-clicking on the map changes the view to
+ * the "next" resolution. And releasing the fingers after pinch-zooming
+ * snaps to the closest resolution (with an animation).
+ *
+ * The *resolution constraint* snaps to specific resolutions. It is
+ * determined by the following options: `resolutions`, `maxResolution`,
+ * `maxZoom`, and `zoomFactor`. If `resolutions` is set, the other three
+ * options are ignored. See documentation for each option for more
+ * information.
+ *
+ * The *rotation constraint* snaps to specific angles. It is determined
+ * by the following options: `enableRotation` and `constrainRotation`.
+ * By default the rotation value is snapped to zero when approaching the
+ * horizontal.
+ *
+ * The *center constraint* is determined by the `extent` option. By
+ * default the center is not constrained at all.
+ *
+ * @constructor
+ * @extends {ol.Object}
+ * @param {olx.ViewOptions=} opt_options View options.
+ * @api stable
+ */
+ol.View = function(opt_options) {
+  goog.base(this);
+  var options = opt_options || {};
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.hints_ = [0, 0];
+
+  /**
+   * @type {Object.<string, *>}
+   */
+  var properties = {};
+  properties[ol.ViewProperty.CENTER] = options.center !== undefined ?
+      options.center : null;
+
+  /**
+   * @private
+   * @const
+   * @type {ol.proj.Projection}
+   */
+  this.projection_ = ol.proj.createProjection(options.projection, 'EPSG:3857');
+
+  var resolutionConstraintInfo = ol.View.createResolutionConstraint_(
+      options);
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.maxResolution_ = resolutionConstraintInfo.maxResolution;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.minResolution_ = resolutionConstraintInfo.minResolution;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.minZoom_ = resolutionConstraintInfo.minZoom;
+
+  var centerConstraint = ol.View.createCenterConstraint_(options);
+  var resolutionConstraint = resolutionConstraintInfo.constraint;
+  var rotationConstraint = ol.View.createRotationConstraint_(options);
+
+  /**
+   * @private
+   * @type {ol.Constraints}
+   */
+  this.constraints_ = new ol.Constraints(
+      centerConstraint, resolutionConstraint, rotationConstraint);
+
+  if (options.resolution !== undefined) {
+    properties[ol.ViewProperty.RESOLUTION] = options.resolution;
+  } else if (options.zoom !== undefined) {
+    properties[ol.ViewProperty.RESOLUTION] = this.constrainResolution(
+        this.maxResolution_, options.zoom - this.minZoom_);
+  }
+  properties[ol.ViewProperty.ROTATION] =
+      options.rotation !== undefined ? options.rotation : 0;
+  this.setProperties(properties);
+};
+goog.inherits(ol.View, ol.Object);
+
+
+/**
+ * @param {number} rotation Target rotation.
+ * @param {ol.Coordinate} anchor Rotation anchor.
+ * @return {ol.Coordinate|undefined} Center for rotation and anchor.
+ */
+ol.View.prototype.calculateCenterRotate = function(rotation, anchor) {
+  var center;
+  var currentCenter = this.getCenter();
+  if (currentCenter !== undefined) {
+    center = [currentCenter[0] - anchor[0], currentCenter[1] - anchor[1]];
+    ol.coordinate.rotate(center, rotation - this.getRotation());
+    ol.coordinate.add(center, anchor);
+  }
+  return center;
+};
+
+
+/**
+ * @param {number} resolution Target resolution.
+ * @param {ol.Coordinate} anchor Zoom anchor.
+ * @return {ol.Coordinate|undefined} Center for resolution and anchor.
+ */
+ol.View.prototype.calculateCenterZoom = function(resolution, anchor) {
+  var center;
+  var currentCenter = this.getCenter();
+  var currentResolution = this.getResolution();
+  if (currentCenter !== undefined && currentResolution !== undefined) {
+    var x = anchor[0] -
+        resolution * (anchor[0] - currentCenter[0]) / currentResolution;
+    var y = anchor[1] -
+        resolution * (anchor[1] - currentCenter[1]) / currentResolution;
+    center = [x, y];
+  }
+  return center;
+};
+
+
+/**
+ * Get the constrained center of this view.
+ * @param {ol.Coordinate|undefined} center Center.
+ * @return {ol.Coordinate|undefined} Constrained center.
+ * @api
+ */
+ol.View.prototype.constrainCenter = function(center) {
+  return this.constraints_.center(center);
+};
+
+
+/**
+ * Get the constrained resolution of this view.
+ * @param {number|undefined} resolution Resolution.
+ * @param {number=} opt_delta Delta. Default is `0`.
+ * @param {number=} opt_direction Direction. Default is `0`.
+ * @return {number|undefined} Constrained resolution.
+ * @api
+ */
+ol.View.prototype.constrainResolution = function(
+    resolution, opt_delta, opt_direction) {
+  var delta = opt_delta || 0;
+  var direction = opt_direction || 0;
+  return this.constraints_.resolution(resolution, delta, direction);
+};
+
+
+/**
+ * Get the constrained rotation of this view.
+ * @param {number|undefined} rotation Rotation.
+ * @param {number=} opt_delta Delta. Default is `0`.
+ * @return {number|undefined} Constrained rotation.
+ * @api
+ */
+ol.View.prototype.constrainRotation = function(rotation, opt_delta) {
+  var delta = opt_delta || 0;
+  return this.constraints_.rotation(rotation, delta);
+};
+
+
+/**
+ * Get the view center.
+ * @return {ol.Coordinate|undefined} The center of the view.
+ * @observable
+ * @api stable
+ */
+ol.View.prototype.getCenter = function() {
+  return /** @type {ol.Coordinate|undefined} */ (
+      this.get(ol.ViewProperty.CENTER));
+};
+
+
+/**
+ * @return {Array.<number>} Hint.
+ */
+ol.View.prototype.getHints = function() {
+  return this.hints_.slice();
+};
+
+
+/**
+ * Calculate the extent for the current view state and the passed size.
+ * The size is the pixel dimensions of the box into which the calculated extent
+ * should fit. In most cases you want to get the extent of the entire map,
+ * that is `map.getSize()`.
+ * @param {ol.Size} size Box pixel size.
+ * @return {ol.Extent} Extent.
+ * @api stable
+ */
+ol.View.prototype.calculateExtent = function(size) {
+  var center = this.getCenter();
+  goog.asserts.assert(center, 'The view center is not defined');
+  var resolution = this.getResolution();
+  goog.asserts.assert(resolution !== undefined,
+      'The view resolution is not defined');
+  var rotation = this.getRotation();
+  goog.asserts.assert(rotation !== undefined,
+      'The view rotation is not defined');
+
+  return ol.extent.getForViewAndSize(center, resolution, rotation, size);
+};
+
+
+/**
+ * Get the view projection.
+ * @return {ol.proj.Projection} The projection of the view.
+ * @api stable
+ */
+ol.View.prototype.getProjection = function() {
+  return this.projection_;
+};
+
+
+/**
+ * Get the view resolution.
+ * @return {number|undefined} The resolution of the view.
+ * @observable
+ * @api stable
+ */
+ol.View.prototype.getResolution = function() {
+  return /** @type {number|undefined} */ (
+      this.get(ol.ViewProperty.RESOLUTION));
+};
+
+
+/**
+ * Get the resolution for a provided extent (in map units) and size (in pixels).
+ * @param {ol.Extent} extent Extent.
+ * @param {ol.Size} size Box pixel size.
+ * @return {number} The resolution at which the provided extent will render at
+ *     the given size.
+ */
+ol.View.prototype.getResolutionForExtent = function(extent, size) {
+  var xResolution = ol.extent.getWidth(extent) / size[0];
+  var yResolution = ol.extent.getHeight(extent) / size[1];
+  return Math.max(xResolution, yResolution);
+};
+
+
+/**
+ * Return a function that returns a value between 0 and 1 for a
+ * resolution. Exponential scaling is assumed.
+ * @param {number=} opt_power Power.
+ * @return {function(number): number} Resolution for value function.
+ */
+ol.View.prototype.getResolutionForValueFunction = function(opt_power) {
+  var power = opt_power || 2;
+  var maxResolution = this.maxResolution_;
+  var minResolution = this.minResolution_;
+  var max = Math.log(maxResolution / minResolution) / Math.log(power);
+  return (
+      /**
+       * @param {number} value Value.
+       * @return {number} Resolution.
+       */
+      function(value) {
+        var resolution = maxResolution / Math.pow(power, value * max);
+        goog.asserts.assert(resolution >= minResolution &&
+            resolution <= maxResolution,
+            'calculated resolution outside allowed bounds (%s <= %s <= %s)',
+            minResolution, resolution, maxResolution);
+        return resolution;
+      });
+};
+
+
+/**
+ * Get the view rotation.
+ * @return {number} The rotation of the view in radians.
+ * @observable
+ * @api stable
+ */
+ol.View.prototype.getRotation = function() {
+  return /** @type {number} */ (this.get(ol.ViewProperty.ROTATION));
+};
+
+
+/**
+ * Return a function that returns a resolution for a value between
+ * 0 and 1. Exponential scaling is assumed.
+ * @param {number=} opt_power Power.
+ * @return {function(number): number} Value for resolution function.
+ */
+ol.View.prototype.getValueForResolutionFunction = function(opt_power) {
+  var power = opt_power || 2;
+  var maxResolution = this.maxResolution_;
+  var minResolution = this.minResolution_;
+  var max = Math.log(maxResolution / minResolution) / Math.log(power);
+  return (
+      /**
+       * @param {number} resolution Resolution.
+       * @return {number} Value.
+       */
+      function(resolution) {
+        var value =
+            (Math.log(maxResolution / resolution) / Math.log(power)) / max;
+        goog.asserts.assert(value >= 0 && value <= 1,
+            'calculated value (%s) ouside allowed range (0-1)', value);
+        return value;
+      });
+};
+
+
+/**
+ * @return {olx.ViewState} View state.
+ */
+ol.View.prototype.getState = function() {
+  goog.asserts.assert(this.isDef(),
+      'the view was not defined (had no center and/or resolution)');
+  var center = /** @type {ol.Coordinate} */ (this.getCenter());
+  var projection = this.getProjection();
+  var resolution = /** @type {number} */ (this.getResolution());
+  var rotation = this.getRotation();
+  return /** @type {olx.ViewState} */ ({
+    // Snap center to closest pixel
+    center: [
+      Math.round(center[0] / resolution) * resolution,
+      Math.round(center[1] / resolution) * resolution
+    ],
+    projection: projection !== undefined ? projection : null,
+    resolution: resolution,
+    rotation: rotation
+  });
+};
+
+
+/**
+ * Get the current zoom level. Return undefined if the current
+ * resolution is undefined or not a "constrained resolution".
+ * @return {number|undefined} Zoom.
+ * @api stable
+ */
+ol.View.prototype.getZoom = function() {
+  var offset;
+  var resolution = this.getResolution();
+
+  if (resolution !== undefined) {
+    var res, z = 0;
+    do {
+      res = this.constrainResolution(this.maxResolution_, z);
+      if (res == resolution) {
+        offset = z;
+        break;
+      }
+      ++z;
+    } while (res > this.minResolution_);
+  }
+
+  return offset !== undefined ? this.minZoom_ + offset : offset;
+};
+
+
+/**
+ * Fit the given geometry or extent based on the given map size and border.
+ * The size is pixel dimensions of the box to fit the extent into.
+ * In most cases you will want to use the map size, that is `map.getSize()`.
+ * Takes care of the map angle.
+ * @param {ol.geom.SimpleGeometry|ol.Extent} geometry Geometry.
+ * @param {ol.Size} size Box pixel size.
+ * @param {olx.view.FitOptions=} opt_options Options.
+ * @api
+ */
+ol.View.prototype.fit = function(geometry, size, opt_options) {
+  if (!(geometry instanceof ol.geom.SimpleGeometry)) {
+    goog.asserts.assert(goog.isArray(geometry),
+        'invalid extent or geometry');
+    goog.asserts.assert(!ol.extent.isEmpty(geometry),
+        'cannot fit empty extent');
+    geometry = ol.geom.Polygon.fromExtent(geometry);
+  }
+
+  var options = opt_options || {};
+
+  var padding = options.padding !== undefined ? options.padding : [0, 0, 0, 0];
+  var constrainResolution = options.constrainResolution !== undefined ?
+      options.constrainResolution : true;
+  var nearest = options.nearest !== undefined ? options.nearest : false;
+  var minResolution;
+  if (options.minResolution !== undefined) {
+    minResolution = options.minResolution;
+  } else if (options.maxZoom !== undefined) {
+    minResolution = this.constrainResolution(
+        this.maxResolution_, options.maxZoom - this.minZoom_, 0);
+  } else {
+    minResolution = 0;
+  }
+  var coords = geometry.getFlatCoordinates();
+
+  // calculate rotated extent
+  var rotation = this.getRotation();
+  goog.asserts.assert(rotation !== undefined, 'rotation was not defined');
+  var cosAngle = Math.cos(-rotation);
+  var sinAngle = Math.sin(-rotation);
+  var minRotX = +Infinity;
+  var minRotY = +Infinity;
+  var maxRotX = -Infinity;
+  var maxRotY = -Infinity;
+  var stride = geometry.getStride();
+  for (var i = 0, ii = coords.length; i < ii; i += stride) {
+    var rotX = coords[i] * cosAngle - coords[i + 1] * sinAngle;
+    var rotY = coords[i] * sinAngle + coords[i + 1] * cosAngle;
+    minRotX = Math.min(minRotX, rotX);
+    minRotY = Math.min(minRotY, rotY);
+    maxRotX = Math.max(maxRotX, rotX);
+    maxRotY = Math.max(maxRotY, rotY);
+  }
+
+  // calculate resolution
+  var resolution = this.getResolutionForExtent(
+      [minRotX, minRotY, maxRotX, maxRotY],
+      [size[0] - padding[1] - padding[3], size[1] - padding[0] - padding[2]]);
+  resolution = isNaN(resolution) ? minResolution :
+      Math.max(resolution, minResolution);
+  if (constrainResolution) {
+    var constrainedResolution = this.constrainResolution(resolution, 0, 0);
+    if (!nearest && constrainedResolution < resolution) {
+      constrainedResolution = this.constrainResolution(
+          constrainedResolution, -1, 0);
+    }
+    resolution = constrainedResolution;
+  }
+  this.setResolution(resolution);
+
+  // calculate center
+  sinAngle = -sinAngle; // go back to original rotation
+  var centerRotX = (minRotX + maxRotX) / 2;
+  var centerRotY = (minRotY + maxRotY) / 2;
+  centerRotX += (padding[1] - padding[3]) / 2 * resolution;
+  centerRotY += (padding[0] - padding[2]) / 2 * resolution;
+  var centerX = centerRotX * cosAngle - centerRotY * sinAngle;
+  var centerY = centerRotY * cosAngle + centerRotX * sinAngle;
+
+  this.setCenter([centerX, centerY]);
+};
+
+
+/**
+ * Center on coordinate and view position.
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {ol.Size} size Box pixel size.
+ * @param {ol.Pixel} position Position on the view to center on.
+ * @api
+ */
+ol.View.prototype.centerOn = function(coordinate, size, position) {
+  // calculate rotated position
+  var rotation = this.getRotation();
+  var cosAngle = Math.cos(-rotation);
+  var sinAngle = Math.sin(-rotation);
+  var rotX = coordinate[0] * cosAngle - coordinate[1] * sinAngle;
+  var rotY = coordinate[1] * cosAngle + coordinate[0] * sinAngle;
+  var resolution = this.getResolution();
+  rotX += (size[0] / 2 - position[0]) * resolution;
+  rotY += (position[1] - size[1] / 2) * resolution;
+
+  // go back to original angle
+  sinAngle = -sinAngle; // go back to original rotation
+  var centerX = rotX * cosAngle - rotY * sinAngle;
+  var centerY = rotY * cosAngle + rotX * sinAngle;
+
+  this.setCenter([centerX, centerY]);
+};
+
+
+/**
+ * @return {boolean} Is defined.
+ */
+ol.View.prototype.isDef = function() {
+  return !!this.getCenter() && this.getResolution() !== undefined;
+};
+
+
+/**
+ * Rotate the view around a given coordinate.
+ * @param {number} rotation New rotation value for the view.
+ * @param {ol.Coordinate=} opt_anchor The rotation center.
+ * @api stable
+ */
+ol.View.prototype.rotate = function(rotation, opt_anchor) {
+  if (opt_anchor !== undefined) {
+    var center = this.calculateCenterRotate(rotation, opt_anchor);
+    this.setCenter(center);
+  }
+  this.setRotation(rotation);
+};
+
+
+/**
+ * Set the center of the current view.
+ * @param {ol.Coordinate|undefined} center The center of the view.
+ * @observable
+ * @api stable
+ */
+ol.View.prototype.setCenter = function(center) {
+  this.set(ol.ViewProperty.CENTER, center);
+};
+
+
+/**
+ * @param {ol.ViewHint} hint Hint.
+ * @param {number} delta Delta.
+ * @return {number} New value.
+ */
+ol.View.prototype.setHint = function(hint, delta) {
+  goog.asserts.assert(0 <= hint && hint < this.hints_.length,
+      'illegal hint (%s), must be between 0 and %s', hint, this.hints_.length);
+  this.hints_[hint] += delta;
+  goog.asserts.assert(this.hints_[hint] >= 0,
+      'Hint at %s must be positive, was %s', hint, this.hints_[hint]);
+  return this.hints_[hint];
+};
+
+
+/**
+ * Set the resolution for this view.
+ * @param {number|undefined} resolution The resolution of the view.
+ * @observable
+ * @api stable
+ */
+ol.View.prototype.setResolution = function(resolution) {
+  this.set(ol.ViewProperty.RESOLUTION, resolution);
+};
+
+
+/**
+ * Set the rotation for this view.
+ * @param {number} rotation The rotation of the view in radians.
+ * @observable
+ * @api stable
+ */
+ol.View.prototype.setRotation = function(rotation) {
+  this.set(ol.ViewProperty.ROTATION, rotation);
+};
+
+
+/**
+ * Zoom to a specific zoom level.
+ * @param {number} zoom Zoom level.
+ * @api stable
+ */
+ol.View.prototype.setZoom = function(zoom) {
+  var resolution = this.constrainResolution(
+      this.maxResolution_, zoom - this.minZoom_, 0);
+  this.setResolution(resolution);
+};
+
+
+/**
+ * @param {olx.ViewOptions} options View options.
+ * @private
+ * @return {ol.CenterConstraintType}
+ */
+ol.View.createCenterConstraint_ = function(options) {
+  if (options.extent !== undefined) {
+    return ol.CenterConstraint.createExtent(options.extent);
+  } else {
+    return ol.CenterConstraint.none;
+  }
+};
+
+
+/**
+ * @private
+ * @param {olx.ViewOptions} options View options.
+ * @return {{constraint: ol.ResolutionConstraintType, maxResolution: number,
+ *     minResolution: number}}
+ */
+ol.View.createResolutionConstraint_ = function(options) {
+  var resolutionConstraint;
+  var maxResolution;
+  var minResolution;
+
+  // TODO: move these to be ol constants
+  // see https://github.com/openlayers/ol3/issues/2076
+  var defaultMaxZoom = 28;
+  var defaultZoomFactor = 2;
+
+  var minZoom = options.minZoom !== undefined ?
+      options.minZoom : ol.DEFAULT_MIN_ZOOM;
+
+  var maxZoom = options.maxZoom !== undefined ?
+      options.maxZoom : defaultMaxZoom;
+
+  var zoomFactor = options.zoomFactor !== undefined ?
+      options.zoomFactor : defaultZoomFactor;
+
+  if (options.resolutions !== undefined) {
+    var resolutions = options.resolutions;
+    maxResolution = resolutions[0];
+    minResolution = resolutions[resolutions.length - 1];
+    resolutionConstraint = ol.ResolutionConstraint.createSnapToResolutions(
+        resolutions);
+  } else {
+    // calculate the default min and max resolution
+    var projection = ol.proj.createProjection(options.projection, 'EPSG:3857');
+    var extent = projection.getExtent();
+    var size = !extent ?
+        // use an extent that can fit the whole world if need be
+        360 * ol.proj.METERS_PER_UNIT[ol.proj.Units.DEGREES] /
+            ol.proj.METERS_PER_UNIT[projection.getUnits()] :
+        Math.max(ol.extent.getWidth(extent), ol.extent.getHeight(extent));
+
+    var defaultMaxResolution = size / ol.DEFAULT_TILE_SIZE / Math.pow(
+        defaultZoomFactor, ol.DEFAULT_MIN_ZOOM);
+
+    var defaultMinResolution = defaultMaxResolution / Math.pow(
+        defaultZoomFactor, defaultMaxZoom - ol.DEFAULT_MIN_ZOOM);
+
+    // user provided maxResolution takes precedence
+    maxResolution = options.maxResolution;
+    if (maxResolution !== undefined) {
+      minZoom = 0;
+    } else {
+      maxResolution = defaultMaxResolution / Math.pow(zoomFactor, minZoom);
+    }
+
+    // user provided minResolution takes precedence
+    minResolution = options.minResolution;
+    if (minResolution === undefined) {
+      if (options.maxZoom !== undefined) {
+        if (options.maxResolution !== undefined) {
+          minResolution = maxResolution / Math.pow(zoomFactor, maxZoom);
+        } else {
+          minResolution = defaultMaxResolution / Math.pow(zoomFactor, maxZoom);
+        }
+      } else {
+        minResolution = defaultMinResolution;
+      }
+    }
+
+    // given discrete zoom levels, minResolution may be different than provided
+    maxZoom = minZoom + Math.floor(
+        Math.log(maxResolution / minResolution) / Math.log(zoomFactor));
+    minResolution = maxResolution / Math.pow(zoomFactor, maxZoom - minZoom);
+
+    resolutionConstraint = ol.ResolutionConstraint.createSnapToPower(
+        zoomFactor, maxResolution, maxZoom - minZoom);
+  }
+  return {constraint: resolutionConstraint, maxResolution: maxResolution,
+    minResolution: minResolution, minZoom: minZoom};
+};
+
+
+/**
+ * @private
+ * @param {olx.ViewOptions} options View options.
+ * @return {ol.RotationConstraintType} Rotation constraint.
+ */
+ol.View.createRotationConstraint_ = function(options) {
+  var enableRotation = options.enableRotation !== undefined ?
+      options.enableRotation : true;
+  if (enableRotation) {
+    var constrainRotation = options.constrainRotation;
+    if (constrainRotation === undefined || constrainRotation === true) {
+      return ol.RotationConstraint.createSnapToZero();
+    } else if (constrainRotation === false) {
+      return ol.RotationConstraint.none;
+    } else if (goog.isNumber(constrainRotation)) {
+      return ol.RotationConstraint.createSnapToN(constrainRotation);
+    } else {
+      goog.asserts.fail(
+          'illegal option for constrainRotation (%s)', constrainRotation);
+      return ol.RotationConstraint.none;
+    }
+  } else {
+    return ol.RotationConstraint.disable;
+  }
+};
+
+goog.provide('ol.easing');
+
+
+/**
+ * Start slow and speed up.
+ * @param {number} t Input between 0 and 1.
+ * @return {number} Output between 0 and 1.
+ * @api
+ */
+ol.easing.easeIn = function(t) {
+  return Math.pow(t, 3);
+};
+
+
+/**
+ * Start fast and slow down.
+ * @param {number} t Input between 0 and 1.
+ * @return {number} Output between 0 and 1.
+ * @api
+ */
+ol.easing.easeOut = function(t) {
+  return 1 - ol.easing.easeIn(1 - t);
+};
+
+
+/**
+ * Start slow, speed up, and then slow down again.
+ * @param {number} t Input between 0 and 1.
+ * @return {number} Output between 0 and 1.
+ * @api
+ */
+ol.easing.inAndOut = function(t) {
+  return 3 * t * t - 2 * t * t * t;
+};
+
+
+/**
+ * Maintain a constant speed over time.
+ * @param {number} t Input between 0 and 1.
+ * @return {number} Output between 0 and 1.
+ * @api
+ */
+ol.easing.linear = function(t) {
+  return t;
+};
+
+
+/**
+ * Start slow, speed up, and at the very end slow down again.  This has the
+ * same general behavior as {@link ol.easing.inAndOut}, but the final slowdown
+ * is delayed.
+ * @param {number} t Input between 0 and 1.
+ * @return {number} Output between 0 and 1.
+ * @api
+ */
+ol.easing.upAndDown = function(t) {
+  if (t < 0.5) {
+    return ol.easing.inAndOut(2 * t);
+  } else {
+    return 1 - ol.easing.inAndOut(2 * (t - 0.5));
+  }
+};
+
+goog.provide('ol.animation');
+
+goog.require('ol');
+goog.require('ol.PreRenderFunction');
+goog.require('ol.ViewHint');
+goog.require('ol.coordinate');
+goog.require('ol.easing');
+
+
+/**
+ * Generate an animated transition that will "bounce" the resolution as it
+ * approaches the final value.
+ * @param {olx.animation.BounceOptions} options Bounce options.
+ * @return {ol.PreRenderFunction} Pre-render function.
+ * @api
+ */
+ol.animation.bounce = function(options) {
+  var resolution = options.resolution;
+  var start = options.start ? options.start : Date.now();
+  var duration = options.duration !== undefined ? options.duration : 1000;
+  var easing = options.easing ?
+      options.easing : ol.easing.upAndDown;
+  return (
+      /**
+       * @param {ol.Map} map Map.
+       * @param {?olx.FrameState} frameState Frame state.
+       */
+      function(map, frameState) {
+        if (frameState.time < start) {
+          frameState.animate = true;
+          frameState.viewHints[ol.ViewHint.ANIMATING] += 1;
+          return true;
+        } else if (frameState.time < start + duration) {
+          var delta = easing((frameState.time - start) / duration);
+          var deltaResolution = resolution - frameState.viewState.resolution;
+          frameState.animate = true;
+          frameState.viewState.resolution += delta * deltaResolution;
+          frameState.viewHints[ol.ViewHint.ANIMATING] += 1;
+          return true;
+        } else {
+          return false;
+        }
+      });
+};
+
+
+/**
+ * Generate an animated transition while updating the view center.
+ * @param {olx.animation.PanOptions} options Pan options.
+ * @return {ol.PreRenderFunction} Pre-render function.
+ * @api
+ */
+ol.animation.pan = function(options) {
+  var source = options.source;
+  var start = options.start ? options.start : Date.now();
+  var sourceX = source[0];
+  var sourceY = source[1];
+  var duration = options.duration !== undefined ? options.duration : 1000;
+  var easing = options.easing ?
+      options.easing : ol.easing.inAndOut;
+  return (
+      /**
+       * @param {ol.Map} map Map.
+       * @param {?olx.FrameState} frameState Frame state.
+       */
+      function(map, frameState) {
+        if (frameState.time < start) {
+          frameState.animate = true;
+          frameState.viewHints[ol.ViewHint.ANIMATING] += 1;
+          return true;
+        } else if (frameState.time < start + duration) {
+          var delta = 1 - easing((frameState.time - start) / duration);
+          var deltaX = sourceX - frameState.viewState.center[0];
+          var deltaY = sourceY - frameState.viewState.center[1];
+          frameState.animate = true;
+          frameState.viewState.center[0] += delta * deltaX;
+          frameState.viewState.center[1] += delta * deltaY;
+          frameState.viewHints[ol.ViewHint.ANIMATING] += 1;
+          return true;
+        } else {
+          return false;
+        }
+      });
+};
+
+
+/**
+ * Generate an animated transition while updating the view rotation.
+ * @param {olx.animation.RotateOptions} options Rotate options.
+ * @return {ol.PreRenderFunction} Pre-render function.
+ * @api
+ */
+ol.animation.rotate = function(options) {
+  var sourceRotation = options.rotation ? options.rotation : 0;
+  var start = options.start ? options.start : Date.now();
+  var duration = options.duration !== undefined ? options.duration : 1000;
+  var easing = options.easing ?
+      options.easing : ol.easing.inAndOut;
+  var anchor = options.anchor ?
+      options.anchor : null;
+
+  return (
+      /**
+       * @param {ol.Map} map Map.
+       * @param {?olx.FrameState} frameState Frame state.
+       */
+      function(map, frameState) {
+        if (frameState.time < start) {
+          frameState.animate = true;
+          frameState.viewHints[ol.ViewHint.ANIMATING] += 1;
+          return true;
+        } else if (frameState.time < start + duration) {
+          var delta = 1 - easing((frameState.time - start) / duration);
+          var deltaRotation =
+              (sourceRotation - frameState.viewState.rotation) * delta;
+          frameState.animate = true;
+          frameState.viewState.rotation += deltaRotation;
+          if (anchor) {
+            var center = frameState.viewState.center;
+            ol.coordinate.sub(center, anchor);
+            ol.coordinate.rotate(center, deltaRotation);
+            ol.coordinate.add(center, anchor);
+          }
+          frameState.viewHints[ol.ViewHint.ANIMATING] += 1;
+          return true;
+        } else {
+          return false;
+        }
+      });
+};
+
+
+/**
+ * Generate an animated transition while updating the view resolution.
+ * @param {olx.animation.ZoomOptions} options Zoom options.
+ * @return {ol.PreRenderFunction} Pre-render function.
+ * @api
+ */
+ol.animation.zoom = function(options) {
+  var sourceResolution = options.resolution;
+  var start = options.start ? options.start : Date.now();
+  var duration = options.duration !== undefined ? options.duration : 1000;
+  var easing = options.easing ?
+      options.easing : ol.easing.inAndOut;
+  return (
+      /**
+       * @param {ol.Map} map Map.
+       * @param {?olx.FrameState} frameState Frame state.
+       */
+      function(map, frameState) {
+        if (frameState.time < start) {
+          frameState.animate = true;
+          frameState.viewHints[ol.ViewHint.ANIMATING] += 1;
+          return true;
+        } else if (frameState.time < start + duration) {
+          var delta = 1 - easing((frameState.time - start) / duration);
+          var deltaResolution =
+              sourceResolution - frameState.viewState.resolution;
+          frameState.animate = true;
+          frameState.viewState.resolution += delta * deltaResolution;
+          frameState.viewHints[ol.ViewHint.ANIMATING] += 1;
+          return true;
+        } else {
+          return false;
+        }
+      });
+};
+
+goog.provide('ol.TileCoord');
+goog.provide('ol.tilecoord');
+
+goog.require('goog.asserts');
+goog.require('ol.extent');
+
+
+/**
+ * An array of three numbers representing the location of a tile in a tile
+ * grid. The order is `z`, `x`, and `y`. `z` is the zoom level.
+ * @typedef {Array.<number>} ol.TileCoord
+ * @api
+ */
+ol.TileCoord;
+
+
+/**
+ * @enum {number}
+ */
+ol.QuadKeyCharCode = {
+  ZERO: '0'.charCodeAt(0),
+  ONE: '1'.charCodeAt(0),
+  TWO: '2'.charCodeAt(0),
+  THREE: '3'.charCodeAt(0)
+};
+
+
+/**
+ * @param {string} str String that follows pattern “z/x/y” where x, y and z are
+ *   numbers.
+ * @return {ol.TileCoord} Tile coord.
+ */
+ol.tilecoord.createFromString = function(str) {
+  var v = str.split('/');
+  goog.asserts.assert(v.length === 3,
+      'must provide a string in "z/x/y" format, got "%s"', str);
+  return v.map(function(e) {
+    return parseInt(e, 10);
+  });
+};
+
+
+/**
+ * @param {number} z Z.
+ * @param {number} x X.
+ * @param {number} y Y.
+ * @param {ol.TileCoord=} opt_tileCoord Tile coordinate.
+ * @return {ol.TileCoord} Tile coordinate.
+ */
+ol.tilecoord.createOrUpdate = function(z, x, y, opt_tileCoord) {
+  if (opt_tileCoord !== undefined) {
+    opt_tileCoord[0] = z;
+    opt_tileCoord[1] = x;
+    opt_tileCoord[2] = y;
+    return opt_tileCoord;
+  } else {
+    return [z, x, y];
+  }
+};
+
+
+/**
+ * @param {number} z Z.
+ * @param {number} x X.
+ * @param {number} y Y.
+ * @return {string} Key.
+ */
+ol.tilecoord.getKeyZXY = function(z, x, y) {
+  return z + '/' + x + '/' + y;
+};
+
+
+/**
+ * @param {ol.TileCoord} tileCoord Tile coord.
+ * @return {number} Hash.
+ */
+ol.tilecoord.hash = function(tileCoord) {
+  return (tileCoord[1] << tileCoord[0]) + tileCoord[2];
+};
+
+
+/**
+ * @param {ol.TileCoord} tileCoord Tile coord.
+ * @return {string} Quad key.
+ */
+ol.tilecoord.quadKey = function(tileCoord) {
+  var z = tileCoord[0];
+  var digits = new Array(z);
+  var mask = 1 << (z - 1);
+  var i, charCode;
+  for (i = 0; i < z; ++i) {
+    charCode = ol.QuadKeyCharCode.ZERO;
+    if (tileCoord[1] & mask) {
+      charCode += 1;
+    }
+    if (tileCoord[2] & mask) {
+      charCode += 2;
+    }
+    digits[i] = String.fromCharCode(charCode);
+    mask >>= 1;
+  }
+  return digits.join('');
+};
+
+
+/**
+ * @param {ol.TileCoord} tileCoord Tile coord.
+ * @return {string} String.
+ */
+ol.tilecoord.toString = function(tileCoord) {
+  return ol.tilecoord.getKeyZXY(tileCoord[0], tileCoord[1], tileCoord[2]);
+};
+
+
+/**
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {ol.TileCoord} Tile coordinate.
+ */
+ol.tilecoord.wrapX = function(tileCoord, tileGrid, projection) {
+  var z = tileCoord[0];
+  var center = tileGrid.getTileCoordCenter(tileCoord);
+  var projectionExtent = ol.tilegrid.extentFromProjection(projection);
+  if (!ol.extent.containsCoordinate(projectionExtent, center)) {
+    var worldWidth = ol.extent.getWidth(projectionExtent);
+    var worldsAway = Math.ceil((projectionExtent[0] - center[0]) / worldWidth);
+    center[0] += worldWidth * worldsAway;
+    return tileGrid.getTileCoordForCoordAndZ(center, z);
+  } else {
+    return tileCoord;
+  }
+};
+
+
+/**
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {!ol.tilegrid.TileGrid} tileGrid Tile grid.
+ * @return {boolean} Tile coordinate is within extent and zoom level range.
+ */
+ol.tilecoord.withinExtentAndZ = function(tileCoord, tileGrid) {
+  var z = tileCoord[0];
+  var x = tileCoord[1];
+  var y = tileCoord[2];
+
+  if (tileGrid.getMinZoom() > z || z > tileGrid.getMaxZoom()) {
+    return false;
+  }
+  var extent = tileGrid.getExtent();
+  var tileRange;
+  if (!extent) {
+    tileRange = tileGrid.getFullTileRange(z);
+  } else {
+    tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z);
+  }
+  if (!tileRange) {
+    return true;
+  } else {
+    return tileRange.containsXY(x, y);
+  }
+};
+
+goog.provide('ol.TileRange');
+
+goog.require('goog.asserts');
+goog.require('ol.Size');
+goog.require('ol.TileCoord');
+
+
+
+/**
+ * A representation of a contiguous block of tiles.  A tile range is specified
+ * by its min/max tile coordinates and is inclusive of coordinates.
+ *
+ * @constructor
+ * @param {number} minX Minimum X.
+ * @param {number} maxX Maximum X.
+ * @param {number} minY Minimum Y.
+ * @param {number} maxY Maximum Y.
+ * @struct
+ */
+ol.TileRange = function(minX, maxX, minY, maxY) {
+
+  /**
+   * @type {number}
+   */
+  this.minX = minX;
+
+  /**
+   * @type {number}
+   */
+  this.maxX = maxX;
+
+  /**
+   * @type {number}
+   */
+  this.minY = minY;
+
+  /**
+   * @type {number}
+   */
+  this.maxY = maxY;
+
+};
+
+
+/**
+ * @param {...ol.TileCoord} var_args Tile coordinates.
+ * @return {!ol.TileRange} Bounding tile box.
+ */
+ol.TileRange.boundingTileRange = function(var_args) {
+  var tileCoord0 = /** @type {ol.TileCoord} */ (arguments[0]);
+  var tileCoord0Z = tileCoord0[0];
+  var tileCoord0X = tileCoord0[1];
+  var tileCoord0Y = tileCoord0[2];
+  var tileRange = new ol.TileRange(tileCoord0X, tileCoord0X,
+                                   tileCoord0Y, tileCoord0Y);
+  var i, ii, tileCoord, tileCoordX, tileCoordY, tileCoordZ;
+  for (i = 1, ii = arguments.length; i < ii; ++i) {
+    tileCoord = /** @type {ol.TileCoord} */ (arguments[i]);
+    tileCoordZ = tileCoord[0];
+    tileCoordX = tileCoord[1];
+    tileCoordY = tileCoord[2];
+    goog.asserts.assert(tileCoordZ == tileCoord0Z,
+        'passed tilecoords all have the same Z-value');
+    tileRange.minX = Math.min(tileRange.minX, tileCoordX);
+    tileRange.maxX = Math.max(tileRange.maxX, tileCoordX);
+    tileRange.minY = Math.min(tileRange.minY, tileCoordY);
+    tileRange.maxY = Math.max(tileRange.maxY, tileCoordY);
+  }
+  return tileRange;
+};
+
+
+/**
+ * @param {number} minX Minimum X.
+ * @param {number} maxX Maximum X.
+ * @param {number} minY Minimum Y.
+ * @param {number} maxY Maximum Y.
+ * @param {ol.TileRange|undefined} tileRange TileRange.
+ * @return {ol.TileRange} Tile range.
+ */
+ol.TileRange.createOrUpdate = function(minX, maxX, minY, maxY, tileRange) {
+  if (tileRange !== undefined) {
+    tileRange.minX = minX;
+    tileRange.maxX = maxX;
+    tileRange.minY = minY;
+    tileRange.maxY = maxY;
+    return tileRange;
+  } else {
+    return new ol.TileRange(minX, maxX, minY, maxY);
+  }
+};
+
+
+/**
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @return {boolean} Contains tile coordinate.
+ */
+ol.TileRange.prototype.contains = function(tileCoord) {
+  return this.containsXY(tileCoord[1], tileCoord[2]);
+};
+
+
+/**
+ * @param {ol.TileRange} tileRange Tile range.
+ * @return {boolean} Contains.
+ */
+ol.TileRange.prototype.containsTileRange = function(tileRange) {
+  return this.minX <= tileRange.minX && tileRange.maxX <= this.maxX &&
+      this.minY <= tileRange.minY && tileRange.maxY <= this.maxY;
+};
+
+
+/**
+ * @param {number} x Tile coordinate x.
+ * @param {number} y Tile coordinate y.
+ * @return {boolean} Contains coordinate.
+ */
+ol.TileRange.prototype.containsXY = function(x, y) {
+  return this.minX <= x && x <= this.maxX && this.minY <= y && y <= this.maxY;
+};
+
+
+/**
+ * @param {ol.TileRange} tileRange Tile range.
+ * @return {boolean} Equals.
+ */
+ol.TileRange.prototype.equals = function(tileRange) {
+  return this.minX == tileRange.minX && this.minY == tileRange.minY &&
+      this.maxX == tileRange.maxX && this.maxY == tileRange.maxY;
+};
+
+
+/**
+ * @param {ol.TileRange} tileRange Tile range.
+ */
+ol.TileRange.prototype.extend = function(tileRange) {
+  if (tileRange.minX < this.minX) {
+    this.minX = tileRange.minX;
+  }
+  if (tileRange.maxX > this.maxX) {
+    this.maxX = tileRange.maxX;
+  }
+  if (tileRange.minY < this.minY) {
+    this.minY = tileRange.minY;
+  }
+  if (tileRange.maxY > this.maxY) {
+    this.maxY = tileRange.maxY;
+  }
+};
+
+
+/**
+ * @return {number} Height.
+ */
+ol.TileRange.prototype.getHeight = function() {
+  return this.maxY - this.minY + 1;
+};
+
+
+/**
+ * @return {ol.Size} Size.
+ */
+ol.TileRange.prototype.getSize = function() {
+  return [this.getWidth(), this.getHeight()];
+};
+
+
+/**
+ * @return {number} Width.
+ */
+ol.TileRange.prototype.getWidth = function() {
+  return this.maxX - this.minX + 1;
+};
+
+
+/**
+ * @param {ol.TileRange} tileRange Tile range.
+ * @return {boolean} Intersects.
+ */
+ol.TileRange.prototype.intersects = function(tileRange) {
+  return this.minX <= tileRange.maxX &&
+      this.maxX >= tileRange.minX &&
+      this.minY <= tileRange.maxY &&
+      this.maxY >= tileRange.minY;
+};
+
+goog.provide('ol.Attribution');
+
+goog.require('goog.math');
+goog.require('ol.TileRange');
+
+
+
+/**
+ * @classdesc
+ * An attribution for a layer source.
+ *
+ * Example:
+ *
+ *     source: new ol.source.OSM({
+ *       attributions: [
+ *         new ol.Attribution({
+ *           html: 'All maps &copy; ' +
+ *               '<a href="http://www.opencyclemap.org/">OpenCycleMap</a>'
+ *         }),
+ *         ol.source.OSM.ATTRIBUTION
+ *       ],
+ *     ..
+ *
+ * @constructor
+ * @param {olx.AttributionOptions} options Attribution options.
+ * @struct
+ * @api stable
+ */
+ol.Attribution = function(options) {
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.html_ = options.html;
+
+  /**
+   * @private
+   * @type {Object.<string, Array.<ol.TileRange>>}
+   */
+  this.tileRanges_ = options.tileRanges ? options.tileRanges : null;
+
+};
+
+
+/**
+ * Get the attribution markup.
+ * @return {string} The attribution HTML.
+ * @api stable
+ */
+ol.Attribution.prototype.getHTML = function() {
+  return this.html_;
+};
+
+
+/**
+ * @param {Object.<string, ol.TileRange>} tileRanges Tile ranges.
+ * @param {!ol.tilegrid.TileGrid} tileGrid Tile grid.
+ * @param {!ol.proj.Projection} projection Projection.
+ * @return {boolean} Intersects any tile range.
+ */
+ol.Attribution.prototype.intersectsAnyTileRange =
+    function(tileRanges, tileGrid, projection) {
+  if (!this.tileRanges_) {
+    return true;
+  }
+  var i, ii, tileRange, zKey;
+  for (zKey in tileRanges) {
+    if (!(zKey in this.tileRanges_)) {
+      continue;
+    }
+    tileRange = tileRanges[zKey];
+    var testTileRange;
+    for (i = 0, ii = this.tileRanges_[zKey].length; i < ii; ++i) {
+      testTileRange = this.tileRanges_[zKey][i];
+      if (testTileRange.intersects(tileRange)) {
+        return true;
+      }
+      var extentTileRange = tileGrid.getTileRangeForExtentAndZ(
+          projection.getExtent(), parseInt(zKey, 10));
+      var width = extentTileRange.getWidth();
+      if (tileRange.minX < extentTileRange.minX ||
+          tileRange.maxX > extentTileRange.maxX) {
+        if (testTileRange.intersects(new ol.TileRange(
+            goog.math.modulo(tileRange.minX, width),
+            goog.math.modulo(tileRange.maxX, width),
+            tileRange.minY, tileRange.maxY))) {
+          return true;
+        }
+        if (tileRange.getWidth() > width &&
+            testTileRange.intersects(extentTileRange)) {
+          return true;
+        }
+      }
+    }
+  }
+  return false;
+};
+
+goog.provide('ol.CanvasFunctionType');
+
+
+/**
+ * A function returning the canvas element (`{HTMLCanvasElement}`)
+ * used by the source as an image. The arguments passed to the function are:
+ * {@link ol.Extent} the image extent, `{number}` the image resolution,
+ * `{number}` the device pixel ratio, {@link ol.Size} the image size, and
+ * {@link ol.proj.Projection} the image projection. The canvas returned by
+ * this function is cached by the source. The this keyword inside the function
+ * references the {@link ol.source.ImageCanvas}.
+ *
+ * @typedef {function(this:ol.source.ImageCanvas, ol.Extent, number,
+ *     number, ol.Size, ol.proj.Projection): HTMLCanvasElement}
+ * @api
+ */
+ol.CanvasFunctionType;
+
+/**
+ * An implementation of Google Maps' MVCArray.
+ * @see https://developers.google.com/maps/documentation/javascript/reference
+ */
+
+goog.provide('ol.Collection');
+goog.provide('ol.CollectionEvent');
+goog.provide('ol.CollectionEventType');
+
+goog.require('goog.array');
+goog.require('goog.events.Event');
+goog.require('ol.Object');
+
+
+/**
+ * @enum {string}
+ */
+ol.CollectionEventType = {
+  /**
+   * Triggered when an item is added to the collection.
+   * @event ol.CollectionEvent#add
+   * @api stable
+   */
+  ADD: 'add',
+  /**
+   * Triggered when an item is removed from the collection.
+   * @event ol.CollectionEvent#remove
+   * @api stable
+   */
+  REMOVE: 'remove'
+};
+
+
+
+/**
+ * @classdesc
+ * Events emitted by {@link ol.Collection} instances are instances of this
+ * type.
+ *
+ * @constructor
+ * @extends {goog.events.Event}
+ * @implements {oli.CollectionEvent}
+ * @param {ol.CollectionEventType} type Type.
+ * @param {*=} opt_element Element.
+ * @param {Object=} opt_target Target.
+ */
+ol.CollectionEvent = function(type, opt_element, opt_target) {
+
+  goog.base(this, type, opt_target);
+
+  /**
+   * The element that is added to or removed from the collection.
+   * @type {*}
+   * @api stable
+   */
+  this.element = opt_element;
+
+};
+goog.inherits(ol.CollectionEvent, goog.events.Event);
+
+
+/**
+ * @enum {string}
+ */
+ol.CollectionProperty = {
+  LENGTH: 'length'
+};
+
+
+
+/**
+ * @classdesc
+ * An expanded version of standard JS Array, adding convenience methods for
+ * manipulation. Add and remove changes to the Collection trigger a Collection
+ * event. Note that this does not cover changes to the objects _within_ the
+ * Collection; they trigger events on the appropriate object, not on the
+ * Collection as a whole.
+ *
+ * @constructor
+ * @extends {ol.Object}
+ * @fires ol.CollectionEvent
+ * @param {!Array.<T>=} opt_array Array.
+ * @template T
+ * @api stable
+ */
+ol.Collection = function(opt_array) {
+
+  goog.base(this);
+
+  /**
+   * @private
+   * @type {!Array.<T>}
+   */
+  this.array_ = opt_array ? opt_array : [];
+
+  this.updateLength_();
+
+};
+goog.inherits(ol.Collection, ol.Object);
+
+
+/**
+ * Remove all elements from the collection.
+ * @api stable
+ */
+ol.Collection.prototype.clear = function() {
+  while (this.getLength() > 0) {
+    this.pop();
+  }
+};
+
+
+/**
+ * Add elements to the collection.  This pushes each item in the provided array
+ * to the end of the collection.
+ * @param {!Array.<T>} arr Array.
+ * @return {ol.Collection.<T>} This collection.
+ * @api stable
+ */
+ol.Collection.prototype.extend = function(arr) {
+  var i, ii;
+  for (i = 0, ii = arr.length; i < ii; ++i) {
+    this.push(arr[i]);
+  }
+  return this;
+};
+
+
+/**
+ * Iterate over each element, calling the provided callback.
+ * @param {function(this: S, T, number, Array.<T>): *} f The function to call
+ *     for every element. This function takes 3 arguments (the element, the
+ *     index and the array). The return value is ignored.
+ * @param {S=} opt_this The object to use as `this` in `f`.
+ * @template S
+ * @api stable
+ */
+ol.Collection.prototype.forEach = function(f, opt_this) {
+  this.array_.forEach(f, opt_this);
+};
+
+
+/**
+ * Get a reference to the underlying Array object. Warning: if the array
+ * is mutated, no events will be dispatched by the collection, and the
+ * collection's "length" property won't be in sync with the actual length
+ * of the array.
+ * @return {!Array.<T>} Array.
+ * @api stable
+ */
+ol.Collection.prototype.getArray = function() {
+  return this.array_;
+};
+
+
+/**
+ * Get the element at the provided index.
+ * @param {number} index Index.
+ * @return {T} Element.
+ * @api stable
+ */
+ol.Collection.prototype.item = function(index) {
+  return this.array_[index];
+};
+
+
+/**
+ * Get the length of this collection.
+ * @return {number} The length of the array.
+ * @observable
+ * @api stable
+ */
+ol.Collection.prototype.getLength = function() {
+  return /** @type {number} */ (this.get(ol.CollectionProperty.LENGTH));
+};
+
+
+/**
+ * Insert an element at the provided index.
+ * @param {number} index Index.
+ * @param {T} elem Element.
+ * @api stable
+ */
+ol.Collection.prototype.insertAt = function(index, elem) {
+  goog.array.insertAt(this.array_, elem, index);
+  this.updateLength_();
+  this.dispatchEvent(
+      new ol.CollectionEvent(ol.CollectionEventType.ADD, elem, this));
+};
+
+
+/**
+ * Remove the last element of the collection and return it.
+ * Return `undefined` if the collection is empty.
+ * @return {T|undefined} Element.
+ * @api stable
+ */
+ol.Collection.prototype.pop = function() {
+  return this.removeAt(this.getLength() - 1);
+};
+
+
+/**
+ * Insert the provided element at the end of the collection.
+ * @param {T} elem Element.
+ * @return {number} Length.
+ * @api stable
+ */
+ol.Collection.prototype.push = function(elem) {
+  var n = this.array_.length;
+  this.insertAt(n, elem);
+  return n;
+};
+
+
+/**
+ * Remove the first occurrence of an element from the collection.
+ * @param {T} elem Element.
+ * @return {T|undefined} The removed element or undefined if none found.
+ * @api stable
+ */
+ol.Collection.prototype.remove = function(elem) {
+  var arr = this.array_;
+  var i, ii;
+  for (i = 0, ii = arr.length; i < ii; ++i) {
+    if (arr[i] === elem) {
+      return this.removeAt(i);
+    }
+  }
+  return undefined;
+};
+
+
+/**
+ * Remove the element at the provided index and return it.
+ * Return `undefined` if the collection does not contain this index.
+ * @param {number} index Index.
+ * @return {T|undefined} Value.
+ * @api stable
+ */
+ol.Collection.prototype.removeAt = function(index) {
+  var prev = this.array_[index];
+  goog.array.removeAt(this.array_, index);
+  this.updateLength_();
+  this.dispatchEvent(
+      new ol.CollectionEvent(ol.CollectionEventType.REMOVE, prev, this));
+  return prev;
+};
+
+
+/**
+ * Set the element at the provided index.
+ * @param {number} index Index.
+ * @param {T} elem Element.
+ * @api stable
+ */
+ol.Collection.prototype.setAt = function(index, elem) {
+  var n = this.getLength();
+  if (index < n) {
+    var prev = this.array_[index];
+    this.array_[index] = elem;
+    this.dispatchEvent(
+        new ol.CollectionEvent(ol.CollectionEventType.REMOVE, prev, this));
+    this.dispatchEvent(
+        new ol.CollectionEvent(ol.CollectionEventType.ADD, elem, this));
+  } else {
+    var j;
+    for (j = n; j < index; ++j) {
+      this.insertAt(j, undefined);
+    }
+    this.insertAt(index, elem);
+  }
+};
+
+
+/**
+ * @private
+ */
+ol.Collection.prototype.updateLength_ = function() {
+  this.set(ol.CollectionProperty.LENGTH, this.array_.length);
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Names of standard colors with their associated hex values.
+ */
+
+goog.provide('goog.color.names');
+
+
+/**
+ * A map that contains a lot of colors that are recognised by various browsers.
+ * This list is way larger than the minimal one dictated by W3C.
+ * The keys of this map are the lowercase "readable" names of the colors, while
+ * the values are the "hex" values.
+ *
+ * @type {!Object<string, string>}
+ */
+goog.color.names = {
+  'aliceblue': '#f0f8ff',
+  'antiquewhite': '#faebd7',
+  'aqua': '#00ffff',
+  'aquamarine': '#7fffd4',
+  'azure': '#f0ffff',
+  'beige': '#f5f5dc',
+  'bisque': '#ffe4c4',
+  'black': '#000000',
+  'blanchedalmond': '#ffebcd',
+  'blue': '#0000ff',
+  'blueviolet': '#8a2be2',
+  'brown': '#a52a2a',
+  'burlywood': '#deb887',
+  'cadetblue': '#5f9ea0',
+  'chartreuse': '#7fff00',
+  'chocolate': '#d2691e',
+  'coral': '#ff7f50',
+  'cornflowerblue': '#6495ed',
+  'cornsilk': '#fff8dc',
+  'crimson': '#dc143c',
+  'cyan': '#00ffff',
+  'darkblue': '#00008b',
+  'darkcyan': '#008b8b',
+  'darkgoldenrod': '#b8860b',
+  'darkgray': '#a9a9a9',
+  'darkgreen': '#006400',
+  'darkgrey': '#a9a9a9',
+  'darkkhaki': '#bdb76b',
+  'darkmagenta': '#8b008b',
+  'darkolivegreen': '#556b2f',
+  'darkorange': '#ff8c00',
+  'darkorchid': '#9932cc',
+  'darkred': '#8b0000',
+  'darksalmon': '#e9967a',
+  'darkseagreen': '#8fbc8f',
+  'darkslateblue': '#483d8b',
+  'darkslategray': '#2f4f4f',
+  'darkslategrey': '#2f4f4f',
+  'darkturquoise': '#00ced1',
+  'darkviolet': '#9400d3',
+  'deeppink': '#ff1493',
+  'deepskyblue': '#00bfff',
+  'dimgray': '#696969',
+  'dimgrey': '#696969',
+  'dodgerblue': '#1e90ff',
+  'firebrick': '#b22222',
+  'floralwhite': '#fffaf0',
+  'forestgreen': '#228b22',
+  'fuchsia': '#ff00ff',
+  'gainsboro': '#dcdcdc',
+  'ghostwhite': '#f8f8ff',
+  'gold': '#ffd700',
+  'goldenrod': '#daa520',
+  'gray': '#808080',
+  'green': '#008000',
+  'greenyellow': '#adff2f',
+  'grey': '#808080',
+  'honeydew': '#f0fff0',
+  'hotpink': '#ff69b4',
+  'indianred': '#cd5c5c',
+  'indigo': '#4b0082',
+  'ivory': '#fffff0',
+  'khaki': '#f0e68c',
+  'lavender': '#e6e6fa',
+  'lavenderblush': '#fff0f5',
+  'lawngreen': '#7cfc00',
+  'lemonchiffon': '#fffacd',
+  'lightblue': '#add8e6',
+  'lightcoral': '#f08080',
+  'lightcyan': '#e0ffff',
+  'lightgoldenrodyellow': '#fafad2',
+  'lightgray': '#d3d3d3',
+  'lightgreen': '#90ee90',
+  'lightgrey': '#d3d3d3',
+  'lightpink': '#ffb6c1',
+  'lightsalmon': '#ffa07a',
+  'lightseagreen': '#20b2aa',
+  'lightskyblue': '#87cefa',
+  'lightslategray': '#778899',
+  'lightslategrey': '#778899',
+  'lightsteelblue': '#b0c4de',
+  'lightyellow': '#ffffe0',
+  'lime': '#00ff00',
+  'limegreen': '#32cd32',
+  'linen': '#faf0e6',
+  'magenta': '#ff00ff',
+  'maroon': '#800000',
+  'mediumaquamarine': '#66cdaa',
+  'mediumblue': '#0000cd',
+  'mediumorchid': '#ba55d3',
+  'mediumpurple': '#9370db',
+  'mediumseagreen': '#3cb371',
+  'mediumslateblue': '#7b68ee',
+  'mediumspringgreen': '#00fa9a',
+  'mediumturquoise': '#48d1cc',
+  'mediumvioletred': '#c71585',
+  'midnightblue': '#191970',
+  'mintcream': '#f5fffa',
+  'mistyrose': '#ffe4e1',
+  'moccasin': '#ffe4b5',
+  'navajowhite': '#ffdead',
+  'navy': '#000080',
+  'oldlace': '#fdf5e6',
+  'olive': '#808000',
+  'olivedrab': '#6b8e23',
+  'orange': '#ffa500',
+  'orangered': '#ff4500',
+  'orchid': '#da70d6',
+  'palegoldenrod': '#eee8aa',
+  'palegreen': '#98fb98',
+  'paleturquoise': '#afeeee',
+  'palevioletred': '#db7093',
+  'papayawhip': '#ffefd5',
+  'peachpuff': '#ffdab9',
+  'peru': '#cd853f',
+  'pink': '#ffc0cb',
+  'plum': '#dda0dd',
+  'powderblue': '#b0e0e6',
+  'purple': '#800080',
+  'red': '#ff0000',
+  'rosybrown': '#bc8f8f',
+  'royalblue': '#4169e1',
+  'saddlebrown': '#8b4513',
+  'salmon': '#fa8072',
+  'sandybrown': '#f4a460',
+  'seagreen': '#2e8b57',
+  'seashell': '#fff5ee',
+  'sienna': '#a0522d',
+  'silver': '#c0c0c0',
+  'skyblue': '#87ceeb',
+  'slateblue': '#6a5acd',
+  'slategray': '#708090',
+  'slategrey': '#708090',
+  'snow': '#fffafa',
+  'springgreen': '#00ff7f',
+  'steelblue': '#4682b4',
+  'tan': '#d2b48c',
+  'teal': '#008080',
+  'thistle': '#d8bfd8',
+  'tomato': '#ff6347',
+  'turquoise': '#40e0d0',
+  'violet': '#ee82ee',
+  'wheat': '#f5deb3',
+  'white': '#ffffff',
+  'whitesmoke': '#f5f5f5',
+  'yellow': '#ffff00',
+  'yellowgreen': '#9acd32'
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Utilities related to color and color conversion.
+ */
+
+goog.provide('goog.color');
+goog.provide('goog.color.Hsl');
+goog.provide('goog.color.Hsv');
+goog.provide('goog.color.Rgb');
+
+goog.require('goog.color.names');
+goog.require('goog.math');
+
+
+/**
+ * RGB color representation. An array containing three elements [r, g, b],
+ * each an integer in [0, 255], representing the red, green, and blue components
+ * of the color respectively.
+ * @typedef {Array<number>}
+ */
+goog.color.Rgb;
+
+
+/**
+ * HSV color representation. An array containing three elements [h, s, v]:
+ * h (hue) must be an integer in [0, 360], cyclic.
+ * s (saturation) must be a number in [0, 1].
+ * v (value/brightness) must be an integer in [0, 255].
+ * @typedef {Array<number>}
+ */
+goog.color.Hsv;
+
+
+/**
+ * HSL color representation. An array containing three elements [h, s, l]:
+ * h (hue) must be an integer in [0, 360], cyclic.
+ * s (saturation) must be a number in [0, 1].
+ * l (lightness) must be a number in [0, 1].
+ * @typedef {Array<number>}
+ */
+goog.color.Hsl;
+
+
+/**
+ * Parses a color out of a string.
+ * @param {string} str Color in some format.
+ * @return {{hex: string, type: string}} 'hex' is a string containing a hex
+ *     representation of the color, 'type' is a string containing the type
+ *     of color format passed in ('hex', 'rgb', 'named').
+ */
+goog.color.parse = function(str) {
+  var result = {};
+  str = String(str);
+
+  var maybeHex = goog.color.prependHashIfNecessaryHelper(str);
+  if (goog.color.isValidHexColor_(maybeHex)) {
+    result.hex = goog.color.normalizeHex(maybeHex);
+    result.type = 'hex';
+    return result;
+  } else {
+    var rgb = goog.color.isValidRgbColor_(str);
+    if (rgb.length) {
+      result.hex = goog.color.rgbArrayToHex(rgb);
+      result.type = 'rgb';
+      return result;
+    } else if (goog.color.names) {
+      var hex = goog.color.names[str.toLowerCase()];
+      if (hex) {
+        result.hex = hex;
+        result.type = 'named';
+        return result;
+      }
+    }
+  }
+  throw Error(str + ' is not a valid color string');
+};
+
+
+/**
+ * Determines if the given string can be parsed as a color.
+ *     {@see goog.color.parse}.
+ * @param {string} str Potential color string.
+ * @return {boolean} True if str is in a format that can be parsed to a color.
+ */
+goog.color.isValidColor = function(str) {
+  var maybeHex = goog.color.prependHashIfNecessaryHelper(str);
+  return !!(goog.color.isValidHexColor_(maybeHex) ||
+            goog.color.isValidRgbColor_(str).length ||
+            goog.color.names && goog.color.names[str.toLowerCase()]);
+};
+
+
+/**
+ * Parses red, green, blue components out of a valid rgb color string.
+ * Throws Error if the color string is invalid.
+ * @param {string} str RGB representation of a color.
+ *    {@see goog.color.isValidRgbColor_}.
+ * @return {!goog.color.Rgb} rgb representation of the color.
+ */
+goog.color.parseRgb = function(str) {
+  var rgb = goog.color.isValidRgbColor_(str);
+  if (!rgb.length) {
+    throw Error(str + ' is not a valid RGB color');
+  }
+  return rgb;
+};
+
+
+/**
+ * Converts a hex representation of a color to RGB.
+ * @param {string} hexColor Color to convert.
+ * @return {string} string of the form 'rgb(R,G,B)' which can be used in
+ *    styles.
+ */
+goog.color.hexToRgbStyle = function(hexColor) {
+  return goog.color.rgbStyle_(goog.color.hexToRgb(hexColor));
+};
+
+
+/**
+ * Regular expression for extracting the digits in a hex color triplet.
+ * @type {RegExp}
+ * @private
+ */
+goog.color.hexTripletRe_ = /#(.)(.)(.)/;
+
+
+/**
+ * Normalize an hex representation of a color
+ * @param {string} hexColor an hex color string.
+ * @return {string} hex color in the format '#rrggbb' with all lowercase
+ *     literals.
+ */
+goog.color.normalizeHex = function(hexColor) {
+  if (!goog.color.isValidHexColor_(hexColor)) {
+    throw Error("'" + hexColor + "' is not a valid hex color");
+  }
+  if (hexColor.length == 4) { // of the form #RGB
+    hexColor = hexColor.replace(goog.color.hexTripletRe_, '#$1$1$2$2$3$3');
+  }
+  return hexColor.toLowerCase();
+};
+
+
+/**
+ * Converts a hex representation of a color to RGB.
+ * @param {string} hexColor Color to convert.
+ * @return {!goog.color.Rgb} rgb representation of the color.
+ */
+goog.color.hexToRgb = function(hexColor) {
+  hexColor = goog.color.normalizeHex(hexColor);
+  var r = parseInt(hexColor.substr(1, 2), 16);
+  var g = parseInt(hexColor.substr(3, 2), 16);
+  var b = parseInt(hexColor.substr(5, 2), 16);
+
+  return [r, g, b];
+};
+
+
+/**
+ * Converts a color from RGB to hex representation.
+ * @param {number} r Amount of red, int between 0 and 255.
+ * @param {number} g Amount of green, int between 0 and 255.
+ * @param {number} b Amount of blue, int between 0 and 255.
+ * @return {string} hex representation of the color.
+ */
+goog.color.rgbToHex = function(r, g, b) {
+  r = Number(r);
+  g = Number(g);
+  b = Number(b);
+  if (isNaN(r) || r < 0 || r > 255 ||
+      isNaN(g) || g < 0 || g > 255 ||
+      isNaN(b) || b < 0 || b > 255) {
+    throw Error('"(' + r + ',' + g + ',' + b + '") is not a valid RGB color');
+  }
+  var hexR = goog.color.prependZeroIfNecessaryHelper(r.toString(16));
+  var hexG = goog.color.prependZeroIfNecessaryHelper(g.toString(16));
+  var hexB = goog.color.prependZeroIfNecessaryHelper(b.toString(16));
+  return '#' + hexR + hexG + hexB;
+};
+
+
+/**
+ * Converts a color from RGB to hex representation.
+ * @param {goog.color.Rgb} rgb rgb representation of the color.
+ * @return {string} hex representation of the color.
+ */
+goog.color.rgbArrayToHex = function(rgb) {
+  return goog.color.rgbToHex(rgb[0], rgb[1], rgb[2]);
+};
+
+
+/**
+ * Converts a color from RGB color space to HSL color space.
+ * Modified from {@link http://en.wikipedia.org/wiki/HLS_color_space}.
+ * @param {number} r Value of red, in [0, 255].
+ * @param {number} g Value of green, in [0, 255].
+ * @param {number} b Value of blue, in [0, 255].
+ * @return {!goog.color.Hsl} hsl representation of the color.
+ */
+goog.color.rgbToHsl = function(r, g, b) {
+  // First must normalize r, g, b to be between 0 and 1.
+  var normR = r / 255;
+  var normG = g / 255;
+  var normB = b / 255;
+  var max = Math.max(normR, normG, normB);
+  var min = Math.min(normR, normG, normB);
+  var h = 0;
+  var s = 0;
+
+  // Luminosity is the average of the max and min rgb color intensities.
+  var l = 0.5 * (max + min);
+
+  // The hue and saturation are dependent on which color intensity is the max.
+  // If max and min are equal, the color is gray and h and s should be 0.
+  if (max != min) {
+    if (max == normR) {
+      h = 60 * (normG - normB) / (max - min);
+    } else if (max == normG) {
+      h = 60 * (normB - normR) / (max - min) + 120;
+    } else if (max == normB) {
+      h = 60 * (normR - normG) / (max - min) + 240;
+    }
+
+    if (0 < l && l <= 0.5) {
+      s = (max - min) / (2 * l);
+    } else {
+      s = (max - min) / (2 - 2 * l);
+    }
+  }
+
+  // Make sure the hue falls between 0 and 360.
+  return [Math.round(h + 360) % 360, s, l];
+};
+
+
+/**
+ * Converts a color from RGB color space to HSL color space.
+ * @param {goog.color.Rgb} rgb rgb representation of the color.
+ * @return {!goog.color.Hsl} hsl representation of the color.
+ */
+goog.color.rgbArrayToHsl = function(rgb) {
+  return goog.color.rgbToHsl(rgb[0], rgb[1], rgb[2]);
+};
+
+
+/**
+ * Helper for hslToRgb.
+ * @param {number} v1 Helper variable 1.
+ * @param {number} v2 Helper variable 2.
+ * @param {number} vH Helper variable 3.
+ * @return {number} Appropriate RGB value, given the above.
+ * @private
+ */
+goog.color.hueToRgb_ = function(v1, v2, vH) {
+  if (vH < 0) {
+    vH += 1;
+  } else if (vH > 1) {
+    vH -= 1;
+  }
+  if ((6 * vH) < 1) {
+    return (v1 + (v2 - v1) * 6 * vH);
+  } else if (2 * vH < 1) {
+    return v2;
+  } else if (3 * vH < 2) {
+    return (v1 + (v2 - v1) * ((2 / 3) - vH) * 6);
+  }
+  return v1;
+};
+
+
+/**
+ * Converts a color from HSL color space to RGB color space.
+ * Modified from {@link http://www.easyrgb.com/math.html}
+ * @param {number} h Hue, in [0, 360].
+ * @param {number} s Saturation, in [0, 1].
+ * @param {number} l Luminosity, in [0, 1].
+ * @return {!goog.color.Rgb} rgb representation of the color.
+ */
+goog.color.hslToRgb = function(h, s, l) {
+  var r = 0;
+  var g = 0;
+  var b = 0;
+  var normH = h / 360; // normalize h to fall in [0, 1]
+
+  if (s == 0) {
+    r = g = b = l * 255;
+  } else {
+    var temp1 = 0;
+    var temp2 = 0;
+    if (l < 0.5) {
+      temp2 = l * (1 + s);
+    } else {
+      temp2 = l + s - (s * l);
+    }
+    temp1 = 2 * l - temp2;
+    r = 255 * goog.color.hueToRgb_(temp1, temp2, normH + (1 / 3));
+    g = 255 * goog.color.hueToRgb_(temp1, temp2, normH);
+    b = 255 * goog.color.hueToRgb_(temp1, temp2, normH - (1 / 3));
+  }
+
+  return [Math.round(r), Math.round(g), Math.round(b)];
+};
+
+
+/**
+ * Converts a color from HSL color space to RGB color space.
+ * @param {goog.color.Hsl} hsl hsl representation of the color.
+ * @return {!goog.color.Rgb} rgb representation of the color.
+ */
+goog.color.hslArrayToRgb = function(hsl) {
+  return goog.color.hslToRgb(hsl[0], hsl[1], hsl[2]);
+};
+
+
+/**
+ * Helper for isValidHexColor_.
+ * @type {RegExp}
+ * @private
+ */
+goog.color.validHexColorRe_ = /^#(?:[0-9a-f]{3}){1,2}$/i;
+
+
+/**
+ * Checks if a string is a valid hex color.  We expect strings of the format
+ * #RRGGBB (ex: #1b3d5f) or #RGB (ex: #3CA == #33CCAA).
+ * @param {string} str String to check.
+ * @return {boolean} Whether the string is a valid hex color.
+ * @private
+ */
+goog.color.isValidHexColor_ = function(str) {
+  return goog.color.validHexColorRe_.test(str);
+};
+
+
+/**
+ * Helper for isNormalizedHexColor_.
+ * @type {RegExp}
+ * @private
+ */
+goog.color.normalizedHexColorRe_ = /^#[0-9a-f]{6}$/;
+
+
+/**
+ * Checks if a string is a normalized hex color.
+ * We expect strings of the format #RRGGBB (ex: #1b3d5f)
+ * using only lowercase letters.
+ * @param {string} str String to check.
+ * @return {boolean} Whether the string is a normalized hex color.
+ * @private
+ */
+goog.color.isNormalizedHexColor_ = function(str) {
+  return goog.color.normalizedHexColorRe_.test(str);
+};
+
+
+/**
+ * Regular expression for matching and capturing RGB style strings. Helper for
+ * isValidRgbColor_.
+ * @type {RegExp}
+ * @private
+ */
+goog.color.rgbColorRe_ =
+    /^(?:rgb)?\((0|[1-9]\d{0,2}),\s?(0|[1-9]\d{0,2}),\s?(0|[1-9]\d{0,2})\)$/i;
+
+
+/**
+ * Checks if a string is a valid rgb color.  We expect strings of the format
+ * '(r, g, b)', or 'rgb(r, g, b)', where each color component is an int in
+ * [0, 255].
+ * @param {string} str String to check.
+ * @return {!goog.color.Rgb} the rgb representation of the color if it is
+ *     a valid color, or the empty array otherwise.
+ * @private
+ */
+goog.color.isValidRgbColor_ = function(str) {
+  // Each component is separate (rather than using a repeater) so we can
+  // capture the match. Also, we explicitly set each component to be either 0,
+  // or start with a non-zero, to prevent octal numbers from slipping through.
+  var regExpResultArray = str.match(goog.color.rgbColorRe_);
+  if (regExpResultArray) {
+    var r = Number(regExpResultArray[1]);
+    var g = Number(regExpResultArray[2]);
+    var b = Number(regExpResultArray[3]);
+    if (r >= 0 && r <= 255 &&
+        g >= 0 && g <= 255 &&
+        b >= 0 && b <= 255) {
+      return [r, g, b];
+    }
+  }
+  return [];
+};
+
+
+/**
+ * Takes a hex value and prepends a zero if it's a single digit.
+ * Small helper method for use by goog.color and friends.
+ * @param {string} hex Hex value to prepend if single digit.
+ * @return {string} hex value prepended with zero if it was single digit,
+ *     otherwise the same value that was passed in.
+ */
+goog.color.prependZeroIfNecessaryHelper = function(hex) {
+  return hex.length == 1 ? '0' + hex : hex;
+};
+
+
+/**
+ * Takes a string a prepends a '#' sign if one doesn't exist.
+ * Small helper method for use by goog.color and friends.
+ * @param {string} str String to check.
+ * @return {string} The value passed in, prepended with a '#' if it didn't
+ *     already have one.
+ */
+goog.color.prependHashIfNecessaryHelper = function(str) {
+  return str.charAt(0) == '#' ? str : '#' + str;
+};
+
+
+/**
+ * Takes an array of [r, g, b] and converts it into a string appropriate for
+ * CSS styles.
+ * @param {goog.color.Rgb} rgb rgb representation of the color.
+ * @return {string} string of the form 'rgb(r,g,b)'.
+ * @private
+ */
+goog.color.rgbStyle_ = function(rgb) {
+  return 'rgb(' + rgb.join(',') + ')';
+};
+
+
+/**
+ * Converts an HSV triplet to an RGB array.  V is brightness because b is
+ *   reserved for blue in RGB.
+ * @param {number} h Hue value in [0, 360].
+ * @param {number} s Saturation value in [0, 1].
+ * @param {number} brightness brightness in [0, 255].
+ * @return {!goog.color.Rgb} rgb representation of the color.
+ */
+goog.color.hsvToRgb = function(h, s, brightness) {
+  var red = 0;
+  var green = 0;
+  var blue = 0;
+  if (s == 0) {
+    red = brightness;
+    green = brightness;
+    blue = brightness;
+  } else {
+    var sextant = Math.floor(h / 60);
+    var remainder = (h / 60) - sextant;
+    var val1 = brightness * (1 - s);
+    var val2 = brightness * (1 - (s * remainder));
+    var val3 = brightness * (1 - (s * (1 - remainder)));
+    switch (sextant) {
+      case 1:
+        red = val2;
+        green = brightness;
+        blue = val1;
+        break;
+      case 2:
+        red = val1;
+        green = brightness;
+        blue = val3;
+        break;
+      case 3:
+        red = val1;
+        green = val2;
+        blue = brightness;
+        break;
+      case 4:
+        red = val3;
+        green = val1;
+        blue = brightness;
+        break;
+      case 5:
+        red = brightness;
+        green = val1;
+        blue = val2;
+        break;
+      case 6:
+      case 0:
+        red = brightness;
+        green = val3;
+        blue = val1;
+        break;
+    }
+  }
+
+  return [Math.floor(red), Math.floor(green), Math.floor(blue)];
+};
+
+
+/**
+ * Converts from RGB values to an array of HSV values.
+ * @param {number} red Red value in [0, 255].
+ * @param {number} green Green value in [0, 255].
+ * @param {number} blue Blue value in [0, 255].
+ * @return {!goog.color.Hsv} hsv representation of the color.
+ */
+goog.color.rgbToHsv = function(red, green, blue) {
+
+  var max = Math.max(Math.max(red, green), blue);
+  var min = Math.min(Math.min(red, green), blue);
+  var hue;
+  var saturation;
+  var value = max;
+  if (min == max) {
+    hue = 0;
+    saturation = 0;
+  } else {
+    var delta = (max - min);
+    saturation = delta / max;
+
+    if (red == max) {
+      hue = (green - blue) / delta;
+    } else if (green == max) {
+      hue = 2 + ((blue - red) / delta);
+    } else {
+      hue = 4 + ((red - green) / delta);
+    }
+    hue *= 60;
+    if (hue < 0) {
+      hue += 360;
+    }
+    if (hue > 360) {
+      hue -= 360;
+    }
+  }
+
+  return [hue, saturation, value];
+};
+
+
+/**
+ * Converts from an array of RGB values to an array of HSV values.
+ * @param {goog.color.Rgb} rgb rgb representation of the color.
+ * @return {!goog.color.Hsv} hsv representation of the color.
+ */
+goog.color.rgbArrayToHsv = function(rgb) {
+  return goog.color.rgbToHsv(rgb[0], rgb[1], rgb[2]);
+};
+
+
+/**
+ * Converts an HSV triplet to an RGB array.
+ * @param {goog.color.Hsv} hsv hsv representation of the color.
+ * @return {!goog.color.Rgb} rgb representation of the color.
+ */
+goog.color.hsvArrayToRgb = function(hsv) {
+  return goog.color.hsvToRgb(hsv[0], hsv[1], hsv[2]);
+};
+
+
+/**
+ * Converts a hex representation of a color to HSL.
+ * @param {string} hex Color to convert.
+ * @return {!goog.color.Hsv} hsv representation of the color.
+ */
+goog.color.hexToHsl = function(hex) {
+  var rgb = goog.color.hexToRgb(hex);
+  return goog.color.rgbToHsl(rgb[0], rgb[1], rgb[2]);
+};
+
+
+/**
+ * Converts from h,s,l values to a hex string
+ * @param {number} h Hue, in [0, 360].
+ * @param {number} s Saturation, in [0, 1].
+ * @param {number} l Luminosity, in [0, 1].
+ * @return {string} hex representation of the color.
+ */
+goog.color.hslToHex = function(h, s, l) {
+  return goog.color.rgbArrayToHex(goog.color.hslToRgb(h, s, l));
+};
+
+
+/**
+ * Converts from an hsl array to a hex string
+ * @param {goog.color.Hsl} hsl hsl representation of the color.
+ * @return {string} hex representation of the color.
+ */
+goog.color.hslArrayToHex = function(hsl) {
+  return goog.color.rgbArrayToHex(goog.color.hslToRgb(hsl[0], hsl[1], hsl[2]));
+};
+
+
+/**
+ * Converts a hex representation of a color to HSV
+ * @param {string} hex Color to convert.
+ * @return {!goog.color.Hsv} hsv representation of the color.
+ */
+goog.color.hexToHsv = function(hex) {
+  return goog.color.rgbArrayToHsv(goog.color.hexToRgb(hex));
+};
+
+
+/**
+ * Converts from h,s,v values to a hex string
+ * @param {number} h Hue, in [0, 360].
+ * @param {number} s Saturation, in [0, 1].
+ * @param {number} v Value, in [0, 255].
+ * @return {string} hex representation of the color.
+ */
+goog.color.hsvToHex = function(h, s, v) {
+  return goog.color.rgbArrayToHex(goog.color.hsvToRgb(h, s, v));
+};
+
+
+/**
+ * Converts from an HSV array to a hex string
+ * @param {goog.color.Hsv} hsv hsv representation of the color.
+ * @return {string} hex representation of the color.
+ */
+goog.color.hsvArrayToHex = function(hsv) {
+  return goog.color.hsvToHex(hsv[0], hsv[1], hsv[2]);
+};
+
+
+/**
+ * Calculates the Euclidean distance between two color vectors on an HSL sphere.
+ * A demo of the sphere can be found at:
+ * http://en.wikipedia.org/wiki/HSL_color_space
+ * In short, a vector for color (H, S, L) in this system can be expressed as
+ * (S*L'*cos(2*PI*H), S*L'*sin(2*PI*H), L), where L' = abs(L - 0.5), and we
+ * simply calculate the 1-2 distance using these coordinates
+ * @param {goog.color.Hsl} hsl1 First color in hsl representation.
+ * @param {goog.color.Hsl} hsl2 Second color in hsl representation.
+ * @return {number} Distance between the two colors, in the range [0, 1].
+ */
+goog.color.hslDistance = function(hsl1, hsl2) {
+  var sl1, sl2;
+  if (hsl1[2] <= 0.5) {
+    sl1 = hsl1[1] * hsl1[2];
+  } else {
+    sl1 = hsl1[1] * (1.0 - hsl1[2]);
+  }
+
+  if (hsl2[2] <= 0.5) {
+    sl2 = hsl2[1] * hsl2[2];
+  } else {
+    sl2 = hsl2[1] * (1.0 - hsl2[2]);
+  }
+
+  var h1 = hsl1[0] / 360.0;
+  var h2 = hsl2[0] / 360.0;
+  var dh = (h1 - h2) * 2.0 * Math.PI;
+  return (hsl1[2] - hsl2[2]) * (hsl1[2] - hsl2[2]) +
+      sl1 * sl1 + sl2 * sl2 - 2 * sl1 * sl2 * Math.cos(dh);
+};
+
+
+/**
+ * Blend two colors together, using the specified factor to indicate the weight
+ * given to the first color
+ * @param {goog.color.Rgb} rgb1 First color represented in rgb.
+ * @param {goog.color.Rgb} rgb2 Second color represented in rgb.
+ * @param {number} factor The weight to be given to rgb1 over rgb2. Values
+ *     should be in the range [0, 1]. If less than 0, factor will be set to 0.
+ *     If greater than 1, factor will be set to 1.
+ * @return {!goog.color.Rgb} Combined color represented in rgb.
+ */
+goog.color.blend = function(rgb1, rgb2, factor) {
+  factor = goog.math.clamp(factor, 0, 1);
+
+  return [
+    Math.round(factor * rgb1[0] + (1.0 - factor) * rgb2[0]),
+    Math.round(factor * rgb1[1] + (1.0 - factor) * rgb2[1]),
+    Math.round(factor * rgb1[2] + (1.0 - factor) * rgb2[2])
+  ];
+};
+
+
+/**
+ * Adds black to the specified color, darkening it
+ * @param {goog.color.Rgb} rgb rgb representation of the color.
+ * @param {number} factor Number in the range [0, 1]. 0 will do nothing, while
+ *     1 will return black. If less than 0, factor will be set to 0. If greater
+ *     than 1, factor will be set to 1.
+ * @return {!goog.color.Rgb} Combined rgb color.
+ */
+goog.color.darken = function(rgb, factor) {
+  var black = [0, 0, 0];
+  return goog.color.blend(black, rgb, factor);
+};
+
+
+/**
+ * Adds white to the specified color, lightening it
+ * @param {goog.color.Rgb} rgb rgb representation of the color.
+ * @param {number} factor Number in the range [0, 1].  0 will do nothing, while
+ *     1 will return white. If less than 0, factor will be set to 0. If greater
+ *     than 1, factor will be set to 1.
+ * @return {!goog.color.Rgb} Combined rgb color.
+ */
+goog.color.lighten = function(rgb, factor) {
+  var white = [255, 255, 255];
+  return goog.color.blend(white, rgb, factor);
+};
+
+
+/**
+ * Find the "best" (highest-contrast) of the suggested colors for the prime
+ * color. Uses W3C formula for judging readability and visual accessibility:
+ * http://www.w3.org/TR/AERT#color-contrast
+ * @param {goog.color.Rgb} prime Color represented as a rgb array.
+ * @param {Array<goog.color.Rgb>} suggestions Array of colors,
+ *     each representing a rgb array.
+ * @return {!goog.color.Rgb} Highest-contrast color represented by an array..
+ */
+goog.color.highContrast = function(prime, suggestions) {
+  var suggestionsWithDiff = [];
+  for (var i = 0; i < suggestions.length; i++) {
+    suggestionsWithDiff.push({
+      color: suggestions[i],
+      diff: goog.color.yiqBrightnessDiff_(suggestions[i], prime) +
+          goog.color.colorDiff_(suggestions[i], prime)
+    });
+  }
+  suggestionsWithDiff.sort(function(a, b) {
+    return b.diff - a.diff;
+  });
+  return suggestionsWithDiff[0].color;
+};
+
+
+/**
+ * Calculate brightness of a color according to YIQ formula (brightness is Y).
+ * More info on YIQ here: http://en.wikipedia.org/wiki/YIQ. Helper method for
+ * goog.color.highContrast()
+ * @param {goog.color.Rgb} rgb Color represented by a rgb array.
+ * @return {number} brightness (Y).
+ * @private
+ */
+goog.color.yiqBrightness_ = function(rgb) {
+  return Math.round((rgb[0] * 299 + rgb[1] * 587 + rgb[2] * 114) / 1000);
+};
+
+
+/**
+ * Calculate difference in brightness of two colors. Helper method for
+ * goog.color.highContrast()
+ * @param {goog.color.Rgb} rgb1 Color represented by a rgb array.
+ * @param {goog.color.Rgb} rgb2 Color represented by a rgb array.
+ * @return {number} Brightness difference.
+ * @private
+ */
+goog.color.yiqBrightnessDiff_ = function(rgb1, rgb2) {
+  return Math.abs(goog.color.yiqBrightness_(rgb1) -
+                  goog.color.yiqBrightness_(rgb2));
+};
+
+
+/**
+ * Calculate color difference between two colors. Helper method for
+ * goog.color.highContrast()
+ * @param {goog.color.Rgb} rgb1 Color represented by a rgb array.
+ * @param {goog.color.Rgb} rgb2 Color represented by a rgb array.
+ * @return {number} Color difference.
+ * @private
+ */
+goog.color.colorDiff_ = function(rgb1, rgb2) {
+  return Math.abs(rgb1[0] - rgb2[0]) + Math.abs(rgb1[1] - rgb2[1]) +
+      Math.abs(rgb1[2] - rgb2[2]);
+};
+
+// We can't use goog.color or goog.color.alpha because they interally use a hex
+// string representation that encodes each channel in a single byte.  This
+// causes occasional loss of precision and rounding errors, especially in the
+// alpha channel.
+
+goog.provide('ol.Color');
+goog.provide('ol.color');
+
+goog.require('goog.asserts');
+goog.require('goog.color');
+goog.require('goog.color.names');
+goog.require('goog.vec.Mat4');
+goog.require('ol');
+goog.require('ol.math');
+
+
+/**
+ * A color represented as a short array [red, green, blue, alpha].
+ * red, green, and blue should be integers in the range 0..255 inclusive.
+ * alpha should be a float in the range 0..1 inclusive.
+ * @typedef {Array.<number>}
+ * @api
+ */
+ol.Color;
+
+
+/**
+ * This RegExp matches # followed by 3 or 6 hex digits.
+ * @const
+ * @type {RegExp}
+ * @private
+ */
+ol.color.hexColorRe_ = /^#(?:[0-9a-f]{3}){1,2}$/i;
+
+
+/**
+ * @see goog.color.rgbColorRe_
+ * @const
+ * @type {RegExp}
+ * @private
+ */
+ol.color.rgbColorRe_ =
+    /^(?:rgb)?\((0|[1-9]\d{0,2}),\s?(0|[1-9]\d{0,2}),\s?(0|[1-9]\d{0,2})\)$/i;
+
+
+/**
+ * @see goog.color.alpha.rgbaColorRe_
+ * @const
+ * @type {RegExp}
+ * @private
+ */
+ol.color.rgbaColorRe_ =
+    /^(?:rgba)?\((0|[1-9]\d{0,2}),\s?(0|[1-9]\d{0,2}),\s?(0|[1-9]\d{0,2}),\s?(0|1|0\.\d{0,10})\)$/i;
+
+
+/**
+ * @param {ol.Color} dst Destination.
+ * @param {ol.Color} src Source.
+ * @param {ol.Color=} opt_color Color.
+ * @return {ol.Color} Color.
+ */
+ol.color.blend = function(dst, src, opt_color) {
+  // http://en.wikipedia.org/wiki/Alpha_compositing
+  // FIXME do we need to scale by 255?
+  var out = opt_color ? opt_color : [];
+  var dstA = dst[3];
+  var srcA = src[3];
+  if (dstA == 1) {
+    out[0] = (src[0] * srcA + dst[0] * (1 - srcA) + 0.5) | 0;
+    out[1] = (src[1] * srcA + dst[1] * (1 - srcA) + 0.5) | 0;
+    out[2] = (src[2] * srcA + dst[2] * (1 - srcA) + 0.5) | 0;
+    out[3] = 1;
+  } else if (srcA === 0) {
+    out[0] = dst[0];
+    out[1] = dst[1];
+    out[2] = dst[2];
+    out[3] = dstA;
+  } else {
+    var outA = srcA + dstA * (1 - srcA);
+    if (outA === 0) {
+      out[0] = 0;
+      out[1] = 0;
+      out[2] = 0;
+      out[3] = 0;
+    } else {
+      out[0] = ((src[0] * srcA + dst[0] * dstA * (1 - srcA)) / outA + 0.5) | 0;
+      out[1] = ((src[1] * srcA + dst[1] * dstA * (1 - srcA)) / outA + 0.5) | 0;
+      out[2] = ((src[2] * srcA + dst[2] * dstA * (1 - srcA)) / outA + 0.5) | 0;
+      out[3] = outA;
+    }
+  }
+  goog.asserts.assert(ol.color.isValid(out),
+      'Output color of blend should be a valid color');
+  return out;
+};
+
+
+/**
+ * Return the color as an array. This function maintains a cache of calculated
+ * arrays which means the result should not be modified.
+ * @param {ol.Color|string} color Color.
+ * @return {ol.Color} Color.
+ * @api
+ */
+ol.color.asArray = function(color) {
+  if (goog.isArray(color)) {
+    return color;
+  } else {
+    goog.asserts.assert(goog.isString(color), 'Color should be a string');
+    return ol.color.fromString(color);
+  }
+};
+
+
+/**
+ * Return the color as an rgba string.
+ * @param {ol.Color|string} color Color.
+ * @return {string} Rgba string.
+ * @api
+ */
+ol.color.asString = function(color) {
+  if (goog.isString(color)) {
+    return color;
+  } else {
+    goog.asserts.assert(goog.isArray(color), 'Color should be an array');
+    return ol.color.toString(color);
+  }
+};
+
+
+/**
+ * @param {ol.Color} color1 Color1.
+ * @param {ol.Color} color2 Color2.
+ * @return {boolean} Equals.
+ */
+ol.color.equals = function(color1, color2) {
+  return color1 === color2 || (
+      color1[0] == color2[0] && color1[1] == color2[1] &&
+      color1[2] == color2[2] && color1[3] == color2[3]);
+};
+
+
+/**
+ * @param {string} s String.
+ * @return {ol.Color} Color.
+ */
+ol.color.fromString = (
+    /**
+     * @return {function(string): ol.Color}
+     */
+    function() {
+
+      // We maintain a small cache of parsed strings.  To provide cheap LRU-like
+      // semantics, whenever the cache grows too large we simply delete an
+      // arbitrary 25% of the entries.
+
+      /**
+       * @const
+       * @type {number}
+       */
+      var MAX_CACHE_SIZE = 1024;
+
+      /**
+       * @type {Object.<string, ol.Color>}
+       */
+      var cache = {};
+
+      /**
+       * @type {number}
+       */
+      var cacheSize = 0;
+
+      return (
+          /**
+           * @param {string} s String.
+           * @return {ol.Color} Color.
+           */
+          function(s) {
+            var color;
+            if (cache.hasOwnProperty(s)) {
+              color = cache[s];
+            } else {
+              if (cacheSize >= MAX_CACHE_SIZE) {
+                var i = 0;
+                var key;
+                for (key in cache) {
+                  if ((i++ & 3) === 0) {
+                    delete cache[key];
+                    --cacheSize;
+                  }
+                }
+              }
+              color = ol.color.fromStringInternal_(s);
+              cache[s] = color;
+              ++cacheSize;
+            }
+            return color;
+          });
+
+    })();
+
+
+/**
+ * @param {string} s String.
+ * @private
+ * @return {ol.Color} Color.
+ */
+ol.color.fromStringInternal_ = function(s) {
+
+  var isHex = false;
+  if (ol.ENABLE_NAMED_COLORS && goog.color.names.hasOwnProperty(s)) {
+    s = goog.color.names[s];
+    isHex = true;
+  }
+
+  var r, g, b, a, color, match;
+  if (isHex || (match = ol.color.hexColorRe_.exec(s))) { // hex
+    var n = s.length - 1; // number of hex digits
+    goog.asserts.assert(n == 3 || n == 6,
+        'Color string length should be 3 or 6');
+    var d = n == 3 ? 1 : 2; // number of digits per channel
+    r = parseInt(s.substr(1 + 0 * d, d), 16);
+    g = parseInt(s.substr(1 + 1 * d, d), 16);
+    b = parseInt(s.substr(1 + 2 * d, d), 16);
+    if (d == 1) {
+      r = (r << 4) + r;
+      g = (g << 4) + g;
+      b = (b << 4) + b;
+    }
+    a = 1;
+    color = [r, g, b, a];
+    goog.asserts.assert(ol.color.isValid(color),
+        'Color should be a valid color');
+    return color;
+  } else if ((match = ol.color.rgbaColorRe_.exec(s))) { // rgba()
+    r = Number(match[1]);
+    g = Number(match[2]);
+    b = Number(match[3]);
+    a = Number(match[4]);
+    color = [r, g, b, a];
+    return ol.color.normalize(color, color);
+  } else if ((match = ol.color.rgbColorRe_.exec(s))) { // rgb()
+    r = Number(match[1]);
+    g = Number(match[2]);
+    b = Number(match[3]);
+    color = [r, g, b, 1];
+    return ol.color.normalize(color, color);
+  } else {
+    goog.asserts.fail(s + ' is not a valid color');
+  }
+
+};
+
+
+/**
+ * @param {ol.Color} color Color.
+ * @return {boolean} Is valid.
+ */
+ol.color.isValid = function(color) {
+  return 0 <= color[0] && color[0] < 256 &&
+      0 <= color[1] && color[1] < 256 &&
+      0 <= color[2] && color[2] < 256 &&
+      0 <= color[3] && color[3] <= 1;
+};
+
+
+/**
+ * @param {ol.Color} color Color.
+ * @param {ol.Color=} opt_color Color.
+ * @return {ol.Color} Clamped color.
+ */
+ol.color.normalize = function(color, opt_color) {
+  var result = opt_color || [];
+  result[0] = ol.math.clamp((color[0] + 0.5) | 0, 0, 255);
+  result[1] = ol.math.clamp((color[1] + 0.5) | 0, 0, 255);
+  result[2] = ol.math.clamp((color[2] + 0.5) | 0, 0, 255);
+  result[3] = ol.math.clamp(color[3], 0, 1);
+  return result;
+};
+
+
+/**
+ * @param {ol.Color} color Color.
+ * @return {string} String.
+ */
+ol.color.toString = function(color) {
+  var r = color[0];
+  if (r != (r | 0)) {
+    r = (r + 0.5) | 0;
+  }
+  var g = color[1];
+  if (g != (g | 0)) {
+    g = (g + 0.5) | 0;
+  }
+  var b = color[2];
+  if (b != (b | 0)) {
+    b = (b + 0.5) | 0;
+  }
+  var a = color[3];
+  return 'rgba(' + r + ',' + g + ',' + b + ',' + a + ')';
+};
+
+
+/**
+ * @param {!ol.Color} color Color.
+ * @param {goog.vec.Mat4.Number} transform Transform.
+ * @param {!ol.Color=} opt_color Color.
+ * @return {ol.Color} Transformed color.
+ */
+ol.color.transform = function(color, transform, opt_color) {
+  var result = opt_color ? opt_color : [];
+  result = goog.vec.Mat4.multVec3(transform, color, result);
+  goog.asserts.assert(goog.isArray(result), 'result should be an array');
+  result[3] = color[3];
+  return ol.color.normalize(result, result);
+};
+
+
+/**
+ * @param {ol.Color|string} color1 Color2.
+ * @param {ol.Color|string} color2 Color2.
+ * @return {boolean} Equals.
+ */
+ol.color.stringOrColorEquals = function(color1, color2) {
+  if (color1 === color2 || color1 == color2) {
+    return true;
+  }
+  if (goog.isString(color1)) {
+    color1 = ol.color.fromString(color1);
+  }
+  if (goog.isString(color2)) {
+    color2 = ol.color.fromString(color2);
+  }
+  return ol.color.equals(color1, color2);
+};
+
+// Copyright 2010 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Browser capability checks for the dom package.
+ *
+ */
+
+
+goog.provide('goog.dom.BrowserFeature');
+
+goog.require('goog.userAgent');
+
+
+/**
+ * Enum of browser capabilities.
+ * @enum {boolean}
+ */
+goog.dom.BrowserFeature = {
+  /**
+   * Whether attributes 'name' and 'type' can be added to an element after it's
+   * created. False in Internet Explorer prior to version 9.
+   */
+  CAN_ADD_NAME_OR_TYPE_ATTRIBUTES: !goog.userAgent.IE ||
+      goog.userAgent.isDocumentModeOrHigher(9),
+
+  /**
+   * Whether we can use element.children to access an element's Element
+   * children. Available since Gecko 1.9.1, IE 9. (IE<9 also includes comment
+   * nodes in the collection.)
+   */
+  CAN_USE_CHILDREN_ATTRIBUTE: !goog.userAgent.GECKO && !goog.userAgent.IE ||
+      goog.userAgent.IE && goog.userAgent.isDocumentModeOrHigher(9) ||
+      goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9.1'),
+
+  /**
+   * Opera, Safari 3, and Internet Explorer 9 all support innerText but they
+   * include text nodes in script and style tags. Not document-mode-dependent.
+   */
+  CAN_USE_INNER_TEXT: (
+      goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('9')),
+
+  /**
+   * MSIE, Opera, and Safari>=4 support element.parentElement to access an
+   * element's parent if it is an Element.
+   */
+  CAN_USE_PARENT_ELEMENT_PROPERTY: goog.userAgent.IE || goog.userAgent.OPERA ||
+      goog.userAgent.WEBKIT,
+
+  /**
+   * Whether NoScope elements need a scoped element written before them in
+   * innerHTML.
+   * MSDN: http://msdn.microsoft.com/en-us/library/ms533897(VS.85).aspx#1
+   */
+  INNER_HTML_NEEDS_SCOPED_ELEMENT: goog.userAgent.IE,
+
+  /**
+   * Whether we use legacy IE range API.
+   */
+  LEGACY_IE_RANGES: goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(9)
+};
+
+// Copyright 2007 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Defines the goog.dom.TagName enum.  This enumerates
+ * all HTML tag names specified in either the the W3C HTML 4.01 index of
+ * elements or the HTML5 draft specification.
+ *
+ * References:
+ * http://www.w3.org/TR/html401/index/elements.html
+ * http://dev.w3.org/html5/spec/section-index.html
+ *
+ */
+goog.provide('goog.dom.TagName');
+
+
+/**
+ * Enum of all html tag names specified by the W3C HTML4.01 and HTML5
+ * specifications.
+ * @enum {string}
+ */
+goog.dom.TagName = {
+  A: 'A',
+  ABBR: 'ABBR',
+  ACRONYM: 'ACRONYM',
+  ADDRESS: 'ADDRESS',
+  APPLET: 'APPLET',
+  AREA: 'AREA',
+  ARTICLE: 'ARTICLE',
+  ASIDE: 'ASIDE',
+  AUDIO: 'AUDIO',
+  B: 'B',
+  BASE: 'BASE',
+  BASEFONT: 'BASEFONT',
+  BDI: 'BDI',
+  BDO: 'BDO',
+  BIG: 'BIG',
+  BLOCKQUOTE: 'BLOCKQUOTE',
+  BODY: 'BODY',
+  BR: 'BR',
+  BUTTON: 'BUTTON',
+  CANVAS: 'CANVAS',
+  CAPTION: 'CAPTION',
+  CENTER: 'CENTER',
+  CITE: 'CITE',
+  CODE: 'CODE',
+  COL: 'COL',
+  COLGROUP: 'COLGROUP',
+  COMMAND: 'COMMAND',
+  DATA: 'DATA',
+  DATALIST: 'DATALIST',
+  DD: 'DD',
+  DEL: 'DEL',
+  DETAILS: 'DETAILS',
+  DFN: 'DFN',
+  DIALOG: 'DIALOG',
+  DIR: 'DIR',
+  DIV: 'DIV',
+  DL: 'DL',
+  DT: 'DT',
+  EM: 'EM',
+  EMBED: 'EMBED',
+  FIELDSET: 'FIELDSET',
+  FIGCAPTION: 'FIGCAPTION',
+  FIGURE: 'FIGURE',
+  FONT: 'FONT',
+  FOOTER: 'FOOTER',
+  FORM: 'FORM',
+  FRAME: 'FRAME',
+  FRAMESET: 'FRAMESET',
+  H1: 'H1',
+  H2: 'H2',
+  H3: 'H3',
+  H4: 'H4',
+  H5: 'H5',
+  H6: 'H6',
+  HEAD: 'HEAD',
+  HEADER: 'HEADER',
+  HGROUP: 'HGROUP',
+  HR: 'HR',
+  HTML: 'HTML',
+  I: 'I',
+  IFRAME: 'IFRAME',
+  IMG: 'IMG',
+  INPUT: 'INPUT',
+  INS: 'INS',
+  ISINDEX: 'ISINDEX',
+  KBD: 'KBD',
+  KEYGEN: 'KEYGEN',
+  LABEL: 'LABEL',
+  LEGEND: 'LEGEND',
+  LI: 'LI',
+  LINK: 'LINK',
+  MAP: 'MAP',
+  MARK: 'MARK',
+  MATH: 'MATH',
+  MENU: 'MENU',
+  META: 'META',
+  METER: 'METER',
+  NAV: 'NAV',
+  NOFRAMES: 'NOFRAMES',
+  NOSCRIPT: 'NOSCRIPT',
+  OBJECT: 'OBJECT',
+  OL: 'OL',
+  OPTGROUP: 'OPTGROUP',
+  OPTION: 'OPTION',
+  OUTPUT: 'OUTPUT',
+  P: 'P',
+  PARAM: 'PARAM',
+  PRE: 'PRE',
+  PROGRESS: 'PROGRESS',
+  Q: 'Q',
+  RP: 'RP',
+  RT: 'RT',
+  RUBY: 'RUBY',
+  S: 'S',
+  SAMP: 'SAMP',
+  SCRIPT: 'SCRIPT',
+  SECTION: 'SECTION',
+  SELECT: 'SELECT',
+  SMALL: 'SMALL',
+  SOURCE: 'SOURCE',
+  SPAN: 'SPAN',
+  STRIKE: 'STRIKE',
+  STRONG: 'STRONG',
+  STYLE: 'STYLE',
+  SUB: 'SUB',
+  SUMMARY: 'SUMMARY',
+  SUP: 'SUP',
+  SVG: 'SVG',
+  TABLE: 'TABLE',
+  TBODY: 'TBODY',
+  TD: 'TD',
+  TEMPLATE: 'TEMPLATE',
+  TEXTAREA: 'TEXTAREA',
+  TFOOT: 'TFOOT',
+  TH: 'TH',
+  THEAD: 'THEAD',
+  TIME: 'TIME',
+  TITLE: 'TITLE',
+  TR: 'TR',
+  TRACK: 'TRACK',
+  TT: 'TT',
+  U: 'U',
+  UL: 'UL',
+  VAR: 'VAR',
+  VIDEO: 'VIDEO',
+  WBR: 'WBR'
+};
+
+// Copyright 2014 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Utilities for HTML element tag names.
+ */
+goog.provide('goog.dom.tags');
+
+goog.require('goog.object');
+
+
+/**
+ * The void elements specified by
+ * http://www.w3.org/TR/html-markup/syntax.html#void-elements.
+ * @const @private {!Object<string, boolean>}
+ */
+goog.dom.tags.VOID_TAGS_ = goog.object.createSet(
+    'area', 'base', 'br', 'col', 'command', 'embed', 'hr', 'img', 'input',
+    'keygen', 'link', 'meta', 'param', 'source', 'track', 'wbr');
+
+
+/**
+ * Checks whether the tag is void (with no contents allowed and no legal end
+ * tag), for example 'br'.
+ * @param {string} tagName The tag name in lower case.
+ * @return {boolean}
+ */
+goog.dom.tags.isVoidTag = function(tagName) {
+  return goog.dom.tags.VOID_TAGS_[tagName] === true;
+};
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+goog.provide('goog.string.TypedString');
+
+
+
+/**
+ * Wrapper for strings that conform to a data type or language.
+ *
+ * Implementations of this interface are wrappers for strings, and typically
+ * associate a type contract with the wrapped string.  Concrete implementations
+ * of this interface may choose to implement additional run-time type checking,
+ * see for example {@code goog.html.SafeHtml}. If available, client code that
+ * needs to ensure type membership of an object should use the type's function
+ * to assert type membership, such as {@code goog.html.SafeHtml.unwrap}.
+ * @interface
+ */
+goog.string.TypedString = function() {};
+
+
+/**
+ * Interface marker of the TypedString interface.
+ *
+ * This property can be used to determine at runtime whether or not an object
+ * implements this interface.  All implementations of this interface set this
+ * property to {@code true}.
+ * @type {boolean}
+ */
+goog.string.TypedString.prototype.implementsGoogStringTypedString;
+
+
+/**
+ * Retrieves this wrapped string's value.
+ * @return {!string} The wrapped string's value.
+ */
+goog.string.TypedString.prototype.getTypedStringValue;
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+goog.provide('goog.string.Const');
+
+goog.require('goog.asserts');
+goog.require('goog.string.TypedString');
+
+
+
+/**
+ * Wrapper for compile-time-constant strings.
+ *
+ * Const is a wrapper for strings that can only be created from program
+ * constants (i.e., string literals).  This property relies on a custom Closure
+ * compiler check that {@code goog.string.Const.from} is only invoked on
+ * compile-time-constant expressions.
+ *
+ * Const is useful in APIs whose correct and secure use requires that certain
+ * arguments are not attacker controlled: Compile-time constants are inherently
+ * under the control of the application and not under control of external
+ * attackers, and hence are safe to use in such contexts.
+ *
+ * Instances of this type must be created via its factory method
+ * {@code goog.string.Const.from} and not by invoking its constructor.  The
+ * constructor intentionally takes no parameters and the type is immutable;
+ * hence only a default instance corresponding to the empty string can be
+ * obtained via constructor invocation.
+ *
+ * @see goog.string.Const#from
+ * @constructor
+ * @final
+ * @struct
+ * @implements {goog.string.TypedString}
+ */
+goog.string.Const = function() {
+  /**
+   * The wrapped value of this Const object.  The field has a purposely ugly
+   * name to make (non-compiled) code that attempts to directly access this
+   * field stand out.
+   * @private {string}
+   */
+  this.stringConstValueWithSecurityContract__googStringSecurityPrivate_ = '';
+
+  /**
+   * A type marker used to implement additional run-time type checking.
+   * @see goog.string.Const#unwrap
+   * @const
+   * @private
+   */
+  this.STRING_CONST_TYPE_MARKER__GOOG_STRING_SECURITY_PRIVATE_ =
+      goog.string.Const.TYPE_MARKER_;
+};
+
+
+/**
+ * @override
+ * @const
+ */
+goog.string.Const.prototype.implementsGoogStringTypedString = true;
+
+
+/**
+ * Returns this Const's value a string.
+ *
+ * IMPORTANT: In code where it is security-relevant that an object's type is
+ * indeed {@code goog.string.Const}, use {@code goog.string.Const.unwrap}
+ * instead of this method.
+ *
+ * @see goog.string.Const#unwrap
+ * @override
+ */
+goog.string.Const.prototype.getTypedStringValue = function() {
+  return this.stringConstValueWithSecurityContract__googStringSecurityPrivate_;
+};
+
+
+/**
+ * Returns a debug-string representation of this value.
+ *
+ * To obtain the actual string value wrapped inside an object of this type,
+ * use {@code goog.string.Const.unwrap}.
+ *
+ * @see goog.string.Const#unwrap
+ * @override
+ */
+goog.string.Const.prototype.toString = function() {
+  return 'Const{' +
+         this.stringConstValueWithSecurityContract__googStringSecurityPrivate_ +
+         '}';
+};
+
+
+/**
+ * Performs a runtime check that the provided object is indeed an instance
+ * of {@code goog.string.Const}, and returns its value.
+ * @param {!goog.string.Const} stringConst The object to extract from.
+ * @return {string} The Const object's contained string, unless the run-time
+ *     type check fails. In that case, {@code unwrap} returns an innocuous
+ *     string, or, if assertions are enabled, throws
+ *     {@code goog.asserts.AssertionError}.
+ */
+goog.string.Const.unwrap = function(stringConst) {
+  // Perform additional run-time type-checking to ensure that stringConst is
+  // indeed an instance of the expected type.  This provides some additional
+  // protection against security bugs due to application code that disables type
+  // checks.
+  if (stringConst instanceof goog.string.Const &&
+      stringConst.constructor === goog.string.Const &&
+      stringConst.STRING_CONST_TYPE_MARKER__GOOG_STRING_SECURITY_PRIVATE_ ===
+          goog.string.Const.TYPE_MARKER_) {
+    return stringConst.
+        stringConstValueWithSecurityContract__googStringSecurityPrivate_;
+  } else {
+    goog.asserts.fail('expected object of type Const, got \'' +
+                      stringConst + '\'');
+    return 'type_error:Const';
+  }
+};
+
+
+/**
+ * Creates a Const object from a compile-time constant string.
+ *
+ * It is illegal to invoke this function on an expression whose
+ * compile-time-contant value cannot be determined by the Closure compiler.
+ *
+ * Correct invocations include,
+ * <pre>
+ *   var s = goog.string.Const.from('hello');
+ *   var t = goog.string.Const.from('hello' + 'world');
+ * </pre>
+ *
+ * In contrast, the following are illegal:
+ * <pre>
+ *   var s = goog.string.Const.from(getHello());
+ *   var t = goog.string.Const.from('hello' + world);
+ * </pre>
+ *
+ * TODO(xtof): Compile-time checks that this function is only called
+ * with compile-time constant expressions.
+ *
+ * @param {string} s A constant string from which to create a Const.
+ * @return {!goog.string.Const} A Const object initialized to stringConst.
+ */
+goog.string.Const.from = function(s) {
+  return goog.string.Const.create__googStringSecurityPrivate_(s);
+};
+
+
+/**
+ * Type marker for the Const type, used to implement additional run-time
+ * type checking.
+ * @const {!Object}
+ * @private
+ */
+goog.string.Const.TYPE_MARKER_ = {};
+
+
+/**
+ * Utility method to create Const instances.
+ * @param {string} s The string to initialize the Const object with.
+ * @return {!goog.string.Const} The initialized Const object.
+ * @private
+ */
+goog.string.Const.create__googStringSecurityPrivate_ = function(s) {
+  var stringConst = new goog.string.Const();
+  stringConst.stringConstValueWithSecurityContract__googStringSecurityPrivate_ =
+      s;
+  return stringConst;
+};
+
+// Copyright 2014 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview The SafeStyle type and its builders.
+ *
+ * TODO(xtof): Link to document stating type contract.
+ */
+
+goog.provide('goog.html.SafeStyle');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.string');
+goog.require('goog.string.Const');
+goog.require('goog.string.TypedString');
+
+
+
+/**
+ * A string-like object which represents a sequence of CSS declarations
+ * ({@code propertyName1: propertyvalue1; propertyName2: propertyValue2; ...})
+ * and that carries the security type contract that its value, as a string,
+ * will not cause untrusted script execution (XSS) when evaluated as CSS in a
+ * browser.
+ *
+ * Instances of this type must be created via the factory methods
+ * ({@code goog.html.SafeStyle.create} or
+ * {@code goog.html.SafeStyle.fromConstant}) and not by invoking its
+ * constructor. The constructor intentionally takes no parameters and the type
+ * is immutable; hence only a default instance corresponding to the empty string
+ * can be obtained via constructor invocation.
+ *
+ * A SafeStyle's string representation ({@link #getTypedStringValue()}) can
+ * safely:
+ * <ul>
+ *   <li>Be interpolated as the entire content of a *quoted* HTML style
+ *       attribute, or before already existing properties. The SafeStyle string
+ *       *must be HTML-attribute-escaped* (where " and ' are escaped) before
+ *       interpolation.
+ *   <li>Be interpolated as the entire content of a {}-wrapped block within a
+ *       stylesheet, or before already existing properties. The SafeStyle string
+ *       should not be escaped before interpolation. SafeStyle's contract also
+ *       guarantees that the string will not be able to introduce new properties
+ *       or elide existing ones.
+ *   <li>Be assigned to the style property of a DOM node. The SafeStyle string
+ *       should not be escaped before being assigned to the property.
+ * </ul>
+ *
+ * A SafeStyle may never contain literal angle brackets. Otherwise, it could
+ * be unsafe to place a SafeStyle into a &lt;style&gt; tag (where it can't
+ * be HTML escaped). For example, if the SafeStyle containing
+ * "{@code font: 'foo &lt;style/&gt;&lt;script&gt;evil&lt;/script&gt;'}" were
+ * interpolated within a &lt;style&gt; tag, this would then break out of the
+ * style context into HTML.
+ *
+ * A SafeStyle may contain literal single or double quotes, and as such the
+ * entire style string must be escaped when used in a style attribute (if
+ * this were not the case, the string could contain a matching quote that
+ * would escape from the style attribute).
+ *
+ * Values of this type must be composable, i.e. for any two values
+ * {@code style1} and {@code style2} of this type,
+ * {@code goog.html.SafeStyle.unwrap(style1) +
+ * goog.html.SafeStyle.unwrap(style2)} must itself be a value that satisfies
+ * the SafeStyle type constraint. This requirement implies that for any value
+ * {@code style} of this type, {@code goog.html.SafeStyle.unwrap(style)} must
+ * not end in a "property value" or "property name" context. For example,
+ * a value of {@code background:url("} or {@code font-} would not satisfy the
+ * SafeStyle contract. This is because concatenating such strings with a
+ * second value that itself does not contain unsafe CSS can result in an
+ * overall string that does. For example, if {@code javascript:evil())"} is
+ * appended to {@code background:url("}, the resulting string may result in
+ * the execution of a malicious script.
+ *
+ * TODO(user): Consider whether we should implement UTF-8 interchange
+ * validity checks and blacklisting of newlines (including Unicode ones) and
+ * other whitespace characters (\t, \f). Document here if so and also update
+ * SafeStyle.fromConstant().
+ *
+ * The following example values comply with this type's contract:
+ * <ul>
+ *   <li><pre>width: 1em;</pre>
+ *   <li><pre>height:1em;</pre>
+ *   <li><pre>width: 1em;height: 1em;</pre>
+ *   <li><pre>background:url('http://url');</pre>
+ * </ul>
+ * In addition, the empty string is safe for use in a CSS attribute.
+ *
+ * The following example values do NOT comply with this type's contract:
+ * <ul>
+ *   <li><pre>background: red</pre> (missing a trailing semi-colon)
+ *   <li><pre>background:</pre> (missing a value and a trailing semi-colon)
+ *   <li><pre>1em</pre> (missing an attribute name, which provides context for
+ *       the value)
+ * </ul>
+ *
+ * @see goog.html.SafeStyle#create
+ * @see goog.html.SafeStyle#fromConstant
+ * @see http://www.w3.org/TR/css3-syntax/
+ * @constructor
+ * @final
+ * @struct
+ * @implements {goog.string.TypedString}
+ */
+goog.html.SafeStyle = function() {
+  /**
+   * The contained value of this SafeStyle.  The field has a purposely
+   * ugly name to make (non-compiled) code that attempts to directly access this
+   * field stand out.
+   * @private {string}
+   */
+  this.privateDoNotAccessOrElseSafeStyleWrappedValue_ = '';
+
+  /**
+   * A type marker used to implement additional run-time type checking.
+   * @see goog.html.SafeStyle#unwrap
+   * @const
+   * @private
+   */
+  this.SAFE_STYLE_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ =
+      goog.html.SafeStyle.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_;
+};
+
+
+/**
+ * @override
+ * @const
+ */
+goog.html.SafeStyle.prototype.implementsGoogStringTypedString = true;
+
+
+/**
+ * Type marker for the SafeStyle type, used to implement additional
+ * run-time type checking.
+ * @const {!Object}
+ * @private
+ */
+goog.html.SafeStyle.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ = {};
+
+
+/**
+ * Creates a SafeStyle object from a compile-time constant string.
+ *
+ * {@code style} should be in the format
+ * {@code name: value; [name: value; ...]} and must not have any < or >
+ * characters in it. This is so that SafeStyle's contract is preserved,
+ * allowing the SafeStyle to correctly be interpreted as a sequence of CSS
+ * declarations and without affecting the syntactic structure of any
+ * surrounding CSS and HTML.
+ *
+ * This method performs basic sanity checks on the format of {@code style}
+ * but does not constrain the format of {@code name} and {@code value}, except
+ * for disallowing tag characters.
+ *
+ * @param {!goog.string.Const} style A compile-time-constant string from which
+ *     to create a SafeStyle.
+ * @return {!goog.html.SafeStyle} A SafeStyle object initialized to
+ *     {@code style}.
+ */
+goog.html.SafeStyle.fromConstant = function(style) {
+  var styleString = goog.string.Const.unwrap(style);
+  if (styleString.length === 0) {
+    return goog.html.SafeStyle.EMPTY;
+  }
+  goog.html.SafeStyle.checkStyle_(styleString);
+  goog.asserts.assert(goog.string.endsWith(styleString, ';'),
+      'Last character of style string is not \';\': ' + styleString);
+  goog.asserts.assert(goog.string.contains(styleString, ':'),
+      'Style string must contain at least one \':\', to ' +
+      'specify a "name: value" pair: ' + styleString);
+  return goog.html.SafeStyle.createSafeStyleSecurityPrivateDoNotAccessOrElse(
+      styleString);
+};
+
+
+/**
+ * Checks if the style definition is valid.
+ * @param {string} style
+ * @private
+ */
+goog.html.SafeStyle.checkStyle_ = function(style) {
+  goog.asserts.assert(!/[<>]/.test(style),
+      'Forbidden characters in style string: ' + style);
+};
+
+
+/**
+ * Returns this SafeStyle's value as a string.
+ *
+ * IMPORTANT: In code where it is security relevant that an object's type is
+ * indeed {@code SafeStyle}, use {@code goog.html.SafeStyle.unwrap} instead of
+ * this method. If in doubt, assume that it's security relevant. In particular,
+ * note that goog.html functions which return a goog.html type do not guarantee
+ * the returned instance is of the right type. For example:
+ *
+ * <pre>
+ * var fakeSafeHtml = new String('fake');
+ * fakeSafeHtml.__proto__ = goog.html.SafeHtml.prototype;
+ * var newSafeHtml = goog.html.SafeHtml.htmlEscape(fakeSafeHtml);
+ * // newSafeHtml is just an alias for fakeSafeHtml, it's passed through by
+ * // goog.html.SafeHtml.htmlEscape() as fakeSafeHtml
+ * // instanceof goog.html.SafeHtml.
+ * </pre>
+ *
+ * @see goog.html.SafeStyle#unwrap
+ * @override
+ */
+goog.html.SafeStyle.prototype.getTypedStringValue = function() {
+  return this.privateDoNotAccessOrElseSafeStyleWrappedValue_;
+};
+
+
+if (goog.DEBUG) {
+  /**
+   * Returns a debug string-representation of this value.
+   *
+   * To obtain the actual string value wrapped in a SafeStyle, use
+   * {@code goog.html.SafeStyle.unwrap}.
+   *
+   * @see goog.html.SafeStyle#unwrap
+   * @override
+   */
+  goog.html.SafeStyle.prototype.toString = function() {
+    return 'SafeStyle{' +
+        this.privateDoNotAccessOrElseSafeStyleWrappedValue_ + '}';
+  };
+}
+
+
+/**
+ * Performs a runtime check that the provided object is indeed a
+ * SafeStyle object, and returns its value.
+ *
+ * @param {!goog.html.SafeStyle} safeStyle The object to extract from.
+ * @return {string} The safeStyle object's contained string, unless
+ *     the run-time type check fails. In that case, {@code unwrap} returns an
+ *     innocuous string, or, if assertions are enabled, throws
+ *     {@code goog.asserts.AssertionError}.
+ */
+goog.html.SafeStyle.unwrap = function(safeStyle) {
+  // Perform additional Run-time type-checking to ensure that
+  // safeStyle is indeed an instance of the expected type.  This
+  // provides some additional protection against security bugs due to
+  // application code that disables type checks.
+  // Specifically, the following checks are performed:
+  // 1. The object is an instance of the expected type.
+  // 2. The object is not an instance of a subclass.
+  // 3. The object carries a type marker for the expected type. "Faking" an
+  // object requires a reference to the type marker, which has names intended
+  // to stand out in code reviews.
+  if (safeStyle instanceof goog.html.SafeStyle &&
+      safeStyle.constructor === goog.html.SafeStyle &&
+      safeStyle.SAFE_STYLE_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ ===
+          goog.html.SafeStyle.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_) {
+    return safeStyle.privateDoNotAccessOrElseSafeStyleWrappedValue_;
+  } else {
+    goog.asserts.fail(
+        'expected object of type SafeStyle, got \'' + safeStyle + '\'');
+    return 'type_error:SafeStyle';
+  }
+};
+
+
+/**
+ * Package-internal utility method to create SafeStyle instances.
+ *
+ * @param {string} style The string to initialize the SafeStyle object with.
+ * @return {!goog.html.SafeStyle} The initialized SafeStyle object.
+ * @package
+ */
+goog.html.SafeStyle.createSafeStyleSecurityPrivateDoNotAccessOrElse =
+    function(style) {
+  return new goog.html.SafeStyle().initSecurityPrivateDoNotAccessOrElse_(style);
+};
+
+
+/**
+ * Called from createSafeStyleSecurityPrivateDoNotAccessOrElse(). This
+ * method exists only so that the compiler can dead code eliminate static
+ * fields (like EMPTY) when they're not accessed.
+ * @param {string} style
+ * @return {!goog.html.SafeStyle}
+ * @private
+ */
+goog.html.SafeStyle.prototype.initSecurityPrivateDoNotAccessOrElse_ = function(
+    style) {
+  this.privateDoNotAccessOrElseSafeStyleWrappedValue_ = style;
+  return this;
+};
+
+
+/**
+ * A SafeStyle instance corresponding to the empty string.
+ * @const {!goog.html.SafeStyle}
+ */
+goog.html.SafeStyle.EMPTY =
+    goog.html.SafeStyle.createSafeStyleSecurityPrivateDoNotAccessOrElse('');
+
+
+/**
+ * The innocuous string generated by goog.html.SafeUrl.create when passed
+ * an unsafe value.
+ * @const {string}
+ */
+goog.html.SafeStyle.INNOCUOUS_STRING = 'zClosurez';
+
+
+/**
+ * Mapping of property names to their values.
+ * @typedef {!Object<string, goog.string.Const|string>}
+ */
+goog.html.SafeStyle.PropertyMap;
+
+
+/**
+ * Creates a new SafeStyle object from the properties specified in the map.
+ * @param {goog.html.SafeStyle.PropertyMap} map Mapping of property names to
+ *     their values, for example {'margin': '1px'}. Names must consist of
+ *     [-_a-zA-Z0-9]. Values might be strings consisting of
+ *     [-,.'"%_!# a-zA-Z0-9], where " and ' must be properly balanced.
+ *     Other values must be wrapped in goog.string.Const. Null value causes
+ *     skipping the property.
+ * @return {!goog.html.SafeStyle}
+ * @throws {Error} If invalid name is provided.
+ * @throws {goog.asserts.AssertionError} If invalid value is provided. With
+ *     disabled assertions, invalid value is replaced by
+ *     goog.html.SafeStyle.INNOCUOUS_STRING.
+ */
+goog.html.SafeStyle.create = function(map) {
+  var style = '';
+  for (var name in map) {
+    if (!/^[-_a-zA-Z0-9]+$/.test(name)) {
+      throw Error('Name allows only [-_a-zA-Z0-9], got: ' + name);
+    }
+    var value = map[name];
+    if (value == null) {
+      continue;
+    }
+    if (value instanceof goog.string.Const) {
+      value = goog.string.Const.unwrap(value);
+      // These characters can be used to change context and we don't want that
+      // even with const values.
+      goog.asserts.assert(!/[{;}]/.test(value), 'Value does not allow [{;}].');
+    } else if (!goog.html.SafeStyle.VALUE_RE_.test(value)) {
+      goog.asserts.fail(
+          'String value allows only [-,."\'%_!# a-zA-Z0-9], got: ' + value);
+      value = goog.html.SafeStyle.INNOCUOUS_STRING;
+    } else if (!goog.html.SafeStyle.hasBalancedQuotes_(value)) {
+      goog.asserts.fail('String value requires balanced quotes, got: ' + value);
+      value = goog.html.SafeStyle.INNOCUOUS_STRING;
+    }
+    style += name + ':' + value + ';';
+  }
+  if (!style) {
+    return goog.html.SafeStyle.EMPTY;
+  }
+  goog.html.SafeStyle.checkStyle_(style);
+  return goog.html.SafeStyle.createSafeStyleSecurityPrivateDoNotAccessOrElse(
+      style);
+};
+
+
+/**
+ * Checks that quotes (" and ') are properly balanced inside a string. Assumes
+ * that neither escape (\) nor any other character that could result in
+ * breaking out of a string parsing context are allowed;
+ * see http://www.w3.org/TR/css3-syntax/#string-token-diagram.
+ * @param {string} value Untrusted CSS property value.
+ * @return {boolean} True if property value is safe with respect to quote
+ *     balancedness.
+ * @private
+ */
+goog.html.SafeStyle.hasBalancedQuotes_ = function(value) {
+  var outsideSingle = true;
+  var outsideDouble = true;
+  for (var i = 0; i < value.length; i++) {
+    var c = value.charAt(i);
+    if (c == "'" && outsideDouble) {
+      outsideSingle = !outsideSingle;
+    } else if (c == '"' && outsideSingle) {
+      outsideDouble = !outsideDouble;
+    }
+  }
+  return outsideSingle && outsideDouble;
+};
+
+
+// Keep in sync with the error string in create().
+/**
+ * Regular expression for safe values.
+ *
+ * Quotes (" and ') are allowed, but a check must be done elsewhere to ensure
+ * they're balanced.
+ *
+ * ',' allows multiple values to be assigned to the same property
+ * (e.g. background-attachment or font-family) and hence could allow
+ * multiple values to get injected, but that should pose no risk of XSS.
+ * @const {!RegExp}
+ * @private
+ */
+goog.html.SafeStyle.VALUE_RE_ = /^[-,."'%_!# a-zA-Z0-9]+$/;
+
+
+/**
+ * Creates a new SafeStyle object by concatenating the values.
+ * @param {...(!goog.html.SafeStyle|!Array<!goog.html.SafeStyle>)} var_args
+ *     SafeStyles to concatenate.
+ * @return {!goog.html.SafeStyle}
+ */
+goog.html.SafeStyle.concat = function(var_args) {
+  var style = '';
+
+  /**
+   * @param {!goog.html.SafeStyle|!Array<!goog.html.SafeStyle>} argument
+   */
+  var addArgument = function(argument) {
+    if (goog.isArray(argument)) {
+      goog.array.forEach(argument, addArgument);
+    } else {
+      style += goog.html.SafeStyle.unwrap(argument);
+    }
+  };
+
+  goog.array.forEach(arguments, addArgument);
+  if (!style) {
+    return goog.html.SafeStyle.EMPTY;
+  }
+  return goog.html.SafeStyle.createSafeStyleSecurityPrivateDoNotAccessOrElse(
+      style);
+};
+
+// Copyright 2014 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview The SafeStyleSheet type and its builders.
+ *
+ * TODO(xtof): Link to document stating type contract.
+ */
+
+goog.provide('goog.html.SafeStyleSheet');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.string');
+goog.require('goog.string.Const');
+goog.require('goog.string.TypedString');
+
+
+
+/**
+ * A string-like object which represents a CSS style sheet and that carries the
+ * security type contract that its value, as a string, will not cause untrusted
+ * script execution (XSS) when evaluated as CSS in a browser.
+ *
+ * Instances of this type must be created via the factory method
+ * {@code goog.html.SafeStyleSheet.fromConstant} and not by invoking its
+ * constructor. The constructor intentionally takes no parameters and the type
+ * is immutable; hence only a default instance corresponding to the empty string
+ * can be obtained via constructor invocation.
+ *
+ * A SafeStyleSheet's string representation can safely be interpolated as the
+ * content of a style element within HTML. The SafeStyleSheet string should
+ * not be escaped before interpolation.
+ *
+ * Values of this type must be composable, i.e. for any two values
+ * {@code styleSheet1} and {@code styleSheet2} of this type,
+ * {@code goog.html.SafeStyleSheet.unwrap(styleSheet1) +
+ * goog.html.SafeStyleSheet.unwrap(styleSheet2)} must itself be a value that
+ * satisfies the SafeStyleSheet type constraint. This requirement implies that
+ * for any value {@code styleSheet} of this type,
+ * {@code goog.html.SafeStyleSheet.unwrap(styleSheet1)} must end in
+ * "beginning of rule" context.
+
+ * A SafeStyleSheet can be constructed via security-reviewed unchecked
+ * conversions. In this case producers of SafeStyleSheet must ensure themselves
+ * that the SafeStyleSheet does not contain unsafe script. Note in particular
+ * that {@code &lt;} is dangerous, even when inside CSS strings, and so should
+ * always be forbidden or CSS-escaped in user controlled input. For example, if
+ * {@code &lt;/style&gt;&lt;script&gt;evil&lt;/script&gt;"} were interpolated
+ * inside a CSS string, it would break out of the context of the original
+ * style element and {@code evil} would execute. Also note that within an HTML
+ * style (raw text) element, HTML character references, such as
+ * {@code &amp;lt;}, are not allowed. See
+ * http://www.w3.org/TR/html5/scripting-1.html#restrictions-for-contents-of-script-elements
+ * (similar considerations apply to the style element).
+ *
+ * @see goog.html.SafeStyleSheet#fromConstant
+ * @constructor
+ * @final
+ * @struct
+ * @implements {goog.string.TypedString}
+ */
+goog.html.SafeStyleSheet = function() {
+  /**
+   * The contained value of this SafeStyleSheet.  The field has a purposely
+   * ugly name to make (non-compiled) code that attempts to directly access this
+   * field stand out.
+   * @private {string}
+   */
+  this.privateDoNotAccessOrElseSafeStyleSheetWrappedValue_ = '';
+
+  /**
+   * A type marker used to implement additional run-time type checking.
+   * @see goog.html.SafeStyleSheet#unwrap
+   * @const
+   * @private
+   */
+  this.SAFE_SCRIPT_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ =
+      goog.html.SafeStyleSheet.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_;
+};
+
+
+/**
+ * @override
+ * @const
+ */
+goog.html.SafeStyleSheet.prototype.implementsGoogStringTypedString = true;
+
+
+/**
+ * Type marker for the SafeStyleSheet type, used to implement additional
+ * run-time type checking.
+ * @const {!Object}
+ * @private
+ */
+goog.html.SafeStyleSheet.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ = {};
+
+
+/**
+ * Creates a new SafeStyleSheet object by concatenating values.
+ * @param {...(!goog.html.SafeStyleSheet|!Array<!goog.html.SafeStyleSheet>)}
+ *     var_args Values to concatenate.
+ * @return {!goog.html.SafeStyleSheet}
+ */
+goog.html.SafeStyleSheet.concat = function(var_args) {
+  var result = '';
+
+  /**
+   * @param {!goog.html.SafeStyleSheet|!Array<!goog.html.SafeStyleSheet>}
+   *     argument
+   */
+  var addArgument = function(argument) {
+    if (goog.isArray(argument)) {
+      goog.array.forEach(argument, addArgument);
+    } else {
+      result += goog.html.SafeStyleSheet.unwrap(argument);
+    }
+  };
+
+  goog.array.forEach(arguments, addArgument);
+  return goog.html.SafeStyleSheet
+      .createSafeStyleSheetSecurityPrivateDoNotAccessOrElse(result);
+};
+
+
+/**
+ * Creates a SafeStyleSheet object from a compile-time constant string.
+ *
+ * {@code styleSheet} must not have any &lt; characters in it, so that
+ * the syntactic structure of the surrounding HTML is not affected.
+ *
+ * @param {!goog.string.Const} styleSheet A compile-time-constant string from
+ *     which to create a SafeStyleSheet.
+ * @return {!goog.html.SafeStyleSheet} A SafeStyleSheet object initialized to
+ *     {@code styleSheet}.
+ */
+goog.html.SafeStyleSheet.fromConstant = function(styleSheet) {
+  var styleSheetString = goog.string.Const.unwrap(styleSheet);
+  if (styleSheetString.length === 0) {
+    return goog.html.SafeStyleSheet.EMPTY;
+  }
+  // > is a valid character in CSS selectors and there's no strict need to
+  // block it if we already block <.
+  goog.asserts.assert(!goog.string.contains(styleSheetString, '<'),
+      "Forbidden '<' character in style sheet string: " + styleSheetString);
+  return goog.html.SafeStyleSheet.
+      createSafeStyleSheetSecurityPrivateDoNotAccessOrElse(styleSheetString);
+};
+
+
+/**
+ * Returns this SafeStyleSheet's value as a string.
+ *
+ * IMPORTANT: In code where it is security relevant that an object's type is
+ * indeed {@code SafeStyleSheet}, use {@code goog.html.SafeStyleSheet.unwrap}
+ * instead of this method. If in doubt, assume that it's security relevant. In
+ * particular, note that goog.html functions which return a goog.html type do
+ * not guarantee the returned instance is of the right type. For example:
+ *
+ * <pre>
+ * var fakeSafeHtml = new String('fake');
+ * fakeSafeHtml.__proto__ = goog.html.SafeHtml.prototype;
+ * var newSafeHtml = goog.html.SafeHtml.htmlEscape(fakeSafeHtml);
+ * // newSafeHtml is just an alias for fakeSafeHtml, it's passed through by
+ * // goog.html.SafeHtml.htmlEscape() as fakeSafeHtml
+ * // instanceof goog.html.SafeHtml.
+ * </pre>
+ *
+ * @see goog.html.SafeStyleSheet#unwrap
+ * @override
+ */
+goog.html.SafeStyleSheet.prototype.getTypedStringValue = function() {
+  return this.privateDoNotAccessOrElseSafeStyleSheetWrappedValue_;
+};
+
+
+if (goog.DEBUG) {
+  /**
+   * Returns a debug string-representation of this value.
+   *
+   * To obtain the actual string value wrapped in a SafeStyleSheet, use
+   * {@code goog.html.SafeStyleSheet.unwrap}.
+   *
+   * @see goog.html.SafeStyleSheet#unwrap
+   * @override
+   */
+  goog.html.SafeStyleSheet.prototype.toString = function() {
+    return 'SafeStyleSheet{' +
+        this.privateDoNotAccessOrElseSafeStyleSheetWrappedValue_ + '}';
+  };
+}
+
+
+/**
+ * Performs a runtime check that the provided object is indeed a
+ * SafeStyleSheet object, and returns its value.
+ *
+ * @param {!goog.html.SafeStyleSheet} safeStyleSheet The object to extract from.
+ * @return {string} The safeStyleSheet object's contained string, unless
+ *     the run-time type check fails. In that case, {@code unwrap} returns an
+ *     innocuous string, or, if assertions are enabled, throws
+ *     {@code goog.asserts.AssertionError}.
+ */
+goog.html.SafeStyleSheet.unwrap = function(safeStyleSheet) {
+  // Perform additional Run-time type-checking to ensure that
+  // safeStyleSheet is indeed an instance of the expected type.  This
+  // provides some additional protection against security bugs due to
+  // application code that disables type checks.
+  // Specifically, the following checks are performed:
+  // 1. The object is an instance of the expected type.
+  // 2. The object is not an instance of a subclass.
+  // 3. The object carries a type marker for the expected type. "Faking" an
+  // object requires a reference to the type marker, which has names intended
+  // to stand out in code reviews.
+  if (safeStyleSheet instanceof goog.html.SafeStyleSheet &&
+      safeStyleSheet.constructor === goog.html.SafeStyleSheet &&
+      safeStyleSheet.SAFE_SCRIPT_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ ===
+          goog.html.SafeStyleSheet.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_) {
+    return safeStyleSheet.privateDoNotAccessOrElseSafeStyleSheetWrappedValue_;
+  } else {
+    goog.asserts.fail(
+        "expected object of type SafeStyleSheet, got '" + safeStyleSheet +
+        "'");
+    return 'type_error:SafeStyleSheet';
+  }
+};
+
+
+/**
+ * Package-internal utility method to create SafeStyleSheet instances.
+ *
+ * @param {string} styleSheet The string to initialize the SafeStyleSheet
+ *     object with.
+ * @return {!goog.html.SafeStyleSheet} The initialized SafeStyleSheet object.
+ * @package
+ */
+goog.html.SafeStyleSheet.createSafeStyleSheetSecurityPrivateDoNotAccessOrElse =
+    function(styleSheet) {
+  return new goog.html.SafeStyleSheet().initSecurityPrivateDoNotAccessOrElse_(
+      styleSheet);
+};
+
+
+/**
+ * Called from createSafeStyleSheetSecurityPrivateDoNotAccessOrElse(). This
+ * method exists only so that the compiler can dead code eliminate static
+ * fields (like EMPTY) when they're not accessed.
+ * @param {string} styleSheet
+ * @return {!goog.html.SafeStyleSheet}
+ * @private
+ */
+goog.html.SafeStyleSheet.prototype.initSecurityPrivateDoNotAccessOrElse_ =
+    function(styleSheet) {
+  this.privateDoNotAccessOrElseSafeStyleSheetWrappedValue_ = styleSheet;
+  return this;
+};
+
+
+/**
+ * A SafeStyleSheet instance corresponding to the empty string.
+ * @const {!goog.html.SafeStyleSheet}
+ */
+goog.html.SafeStyleSheet.EMPTY =
+    goog.html.SafeStyleSheet.
+        createSafeStyleSheetSecurityPrivateDoNotAccessOrElse('');
+
+// Copyright 2015 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Wrapper for URL and its createObjectUrl and revokeObjectUrl
+ * methods that are part of the HTML5 File API.
+ */
+
+goog.provide('goog.fs.url');
+
+
+/**
+ * Creates a blob URL for a blob object.
+ * Throws an error if the browser does not support Object Urls.
+ *
+ * @param {!Blob} blob The object for which to create the URL.
+ * @return {string} The URL for the object.
+ */
+goog.fs.url.createObjectUrl = function(blob) {
+  return goog.fs.url.getUrlObject_().createObjectURL(blob);
+};
+
+
+/**
+ * Revokes a URL created by {@link goog.fs.url.createObjectUrl}.
+ * Throws an error if the browser does not support Object Urls.
+ *
+ * @param {string} url The URL to revoke.
+ */
+goog.fs.url.revokeObjectUrl = function(url) {
+  goog.fs.url.getUrlObject_().revokeObjectURL(url);
+};
+
+
+/**
+ * @typedef {{createObjectURL: (function(!Blob): string),
+ *            revokeObjectURL: function(string): void}}
+ */
+goog.fs.url.UrlObject_;
+
+
+/**
+ * Get the object that has the createObjectURL and revokeObjectURL functions for
+ * this browser.
+ *
+ * @return {goog.fs.url.UrlObject_} The object for this browser.
+ * @private
+ */
+goog.fs.url.getUrlObject_ = function() {
+  var urlObject = goog.fs.url.findUrlObject_();
+  if (urlObject != null) {
+    return urlObject;
+  } else {
+    throw Error('This browser doesn\'t seem to support blob URLs');
+  }
+};
+
+
+/**
+ * Finds the object that has the createObjectURL and revokeObjectURL functions
+ * for this browser.
+ *
+ * @return {?goog.fs.url.UrlObject_} The object for this browser or null if the
+ *     browser does not support Object Urls.
+ * @suppress {unnecessaryCasts} Depending on how the code is compiled, casting
+ *     goog.global to UrlObject_ may result in unnecessary cast warning.
+ *     However, the cast cannot be removed because with different set of
+ *     compiler flags, the cast is indeed necessary.  As such, silencing it.
+ * @private
+ */
+goog.fs.url.findUrlObject_ = function() {
+  // This is what the spec says to do
+  // http://dev.w3.org/2006/webapi/FileAPI/#dfn-createObjectURL
+  if (goog.isDef(goog.global.URL) &&
+      goog.isDef(goog.global.URL.createObjectURL)) {
+    return /** @type {goog.fs.url.UrlObject_} */ (goog.global.URL);
+  // This is what Chrome does (as of 10.0.648.6 dev)
+  } else if (goog.isDef(goog.global.webkitURL) &&
+             goog.isDef(goog.global.webkitURL.createObjectURL)) {
+    return /** @type {goog.fs.url.UrlObject_} */ (goog.global.webkitURL);
+  // This is what the spec used to say to do
+  } else if (goog.isDef(goog.global.createObjectURL)) {
+    return /** @type {goog.fs.url.UrlObject_} */ (goog.global);
+  } else {
+    return null;
+  }
+};
+
+
+/**
+ * Checks whether this browser supports Object Urls. If not, calls to
+ * createObjectUrl and revokeObjectUrl will result in an error.
+ *
+ * @return {boolean} True if this browser supports Object Urls.
+ */
+goog.fs.url.browserSupportsObjectUrls = function() {
+  return goog.fs.url.findUrlObject_() != null;
+};
+
+// Copyright 2007 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Utility functions for supporting Bidi issues.
+ */
+
+
+/**
+ * Namespace for bidi supporting functions.
+ */
+goog.provide('goog.i18n.bidi');
+goog.provide('goog.i18n.bidi.Dir');
+goog.provide('goog.i18n.bidi.DirectionalString');
+goog.provide('goog.i18n.bidi.Format');
+
+
+/**
+ * @define {boolean} FORCE_RTL forces the {@link goog.i18n.bidi.IS_RTL} constant
+ * to say that the current locale is a RTL locale.  This should only be used
+ * if you want to override the default behavior for deciding whether the
+ * current locale is RTL or not.
+ *
+ * {@see goog.i18n.bidi.IS_RTL}
+ */
+goog.define('goog.i18n.bidi.FORCE_RTL', false);
+
+
+/**
+ * Constant that defines whether or not the current locale is a RTL locale.
+ * If {@link goog.i18n.bidi.FORCE_RTL} is not true, this constant will default
+ * to check that {@link goog.LOCALE} is one of a few major RTL locales.
+ *
+ * <p>This is designed to be a maximally efficient compile-time constant. For
+ * example, for the default goog.LOCALE, compiling
+ * "if (goog.i18n.bidi.IS_RTL) alert('rtl') else {}" should produce no code. It
+ * is this design consideration that limits the implementation to only
+ * supporting a few major RTL locales, as opposed to the broader repertoire of
+ * something like goog.i18n.bidi.isRtlLanguage.
+ *
+ * <p>Since this constant refers to the directionality of the locale, it is up
+ * to the caller to determine if this constant should also be used for the
+ * direction of the UI.
+ *
+ * {@see goog.LOCALE}
+ *
+ * @type {boolean}
+ *
+ * TODO(user): write a test that checks that this is a compile-time constant.
+ */
+goog.i18n.bidi.IS_RTL = goog.i18n.bidi.FORCE_RTL ||
+    (
+        (goog.LOCALE.substring(0, 2).toLowerCase() == 'ar' ||
+         goog.LOCALE.substring(0, 2).toLowerCase() == 'fa' ||
+         goog.LOCALE.substring(0, 2).toLowerCase() == 'he' ||
+         goog.LOCALE.substring(0, 2).toLowerCase() == 'iw' ||
+         goog.LOCALE.substring(0, 2).toLowerCase() == 'ps' ||
+         goog.LOCALE.substring(0, 2).toLowerCase() == 'sd' ||
+         goog.LOCALE.substring(0, 2).toLowerCase() == 'ug' ||
+         goog.LOCALE.substring(0, 2).toLowerCase() == 'ur' ||
+         goog.LOCALE.substring(0, 2).toLowerCase() == 'yi') &&
+        (goog.LOCALE.length == 2 ||
+         goog.LOCALE.substring(2, 3) == '-' ||
+         goog.LOCALE.substring(2, 3) == '_')
+    ) || (
+        goog.LOCALE.length >= 3 &&
+        goog.LOCALE.substring(0, 3).toLowerCase() == 'ckb' &&
+        (goog.LOCALE.length == 3 ||
+         goog.LOCALE.substring(3, 4) == '-' ||
+         goog.LOCALE.substring(3, 4) == '_')
+    );
+
+
+/**
+ * Unicode formatting characters and directionality string constants.
+ * @enum {string}
+ */
+goog.i18n.bidi.Format = {
+  /** Unicode "Left-To-Right Embedding" (LRE) character. */
+  LRE: '\u202A',
+  /** Unicode "Right-To-Left Embedding" (RLE) character. */
+  RLE: '\u202B',
+  /** Unicode "Pop Directional Formatting" (PDF) character. */
+  PDF: '\u202C',
+  /** Unicode "Left-To-Right Mark" (LRM) character. */
+  LRM: '\u200E',
+  /** Unicode "Right-To-Left Mark" (RLM) character. */
+  RLM: '\u200F'
+};
+
+
+/**
+ * Directionality enum.
+ * @enum {number}
+ */
+goog.i18n.bidi.Dir = {
+  /**
+   * Left-to-right.
+   */
+  LTR: 1,
+
+  /**
+   * Right-to-left.
+   */
+  RTL: -1,
+
+  /**
+   * Neither left-to-right nor right-to-left.
+   */
+  NEUTRAL: 0
+};
+
+
+/**
+ * 'right' string constant.
+ * @type {string}
+ */
+goog.i18n.bidi.RIGHT = 'right';
+
+
+/**
+ * 'left' string constant.
+ * @type {string}
+ */
+goog.i18n.bidi.LEFT = 'left';
+
+
+/**
+ * 'left' if locale is RTL, 'right' if not.
+ * @type {string}
+ */
+goog.i18n.bidi.I18N_RIGHT = goog.i18n.bidi.IS_RTL ? goog.i18n.bidi.LEFT :
+    goog.i18n.bidi.RIGHT;
+
+
+/**
+ * 'right' if locale is RTL, 'left' if not.
+ * @type {string}
+ */
+goog.i18n.bidi.I18N_LEFT = goog.i18n.bidi.IS_RTL ? goog.i18n.bidi.RIGHT :
+    goog.i18n.bidi.LEFT;
+
+
+/**
+ * Convert a directionality given in various formats to a goog.i18n.bidi.Dir
+ * constant. Useful for interaction with different standards of directionality
+ * representation.
+ *
+ * @param {goog.i18n.bidi.Dir|number|boolean|null} givenDir Directionality given
+ *     in one of the following formats:
+ *     1. A goog.i18n.bidi.Dir constant.
+ *     2. A number (positive = LTR, negative = RTL, 0 = neutral).
+ *     3. A boolean (true = RTL, false = LTR).
+ *     4. A null for unknown directionality.
+ * @param {boolean=} opt_noNeutral Whether a givenDir of zero or
+ *     goog.i18n.bidi.Dir.NEUTRAL should be treated as null, i.e. unknown, in
+ *     order to preserve legacy behavior.
+ * @return {?goog.i18n.bidi.Dir} A goog.i18n.bidi.Dir constant matching the
+ *     given directionality. If given null, returns null (i.e. unknown).
+ */
+goog.i18n.bidi.toDir = function(givenDir, opt_noNeutral) {
+  if (typeof givenDir == 'number') {
+    // This includes the non-null goog.i18n.bidi.Dir case.
+    return givenDir > 0 ? goog.i18n.bidi.Dir.LTR :
+        givenDir < 0 ? goog.i18n.bidi.Dir.RTL :
+        opt_noNeutral ? null : goog.i18n.bidi.Dir.NEUTRAL;
+  } else if (givenDir == null) {
+    return null;
+  } else {
+    // Must be typeof givenDir == 'boolean'.
+    return givenDir ? goog.i18n.bidi.Dir.RTL : goog.i18n.bidi.Dir.LTR;
+  }
+};
+
+
+/**
+ * A practical pattern to identify strong LTR characters. This pattern is not
+ * theoretically correct according to the Unicode standard. It is simplified for
+ * performance and small code size.
+ * @type {string}
+ * @private
+ */
+goog.i18n.bidi.ltrChars_ =
+    'A-Za-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02B8\u0300-\u0590\u0800-\u1FFF' +
+    '\u200E\u2C00-\uFB1C\uFE00-\uFE6F\uFEFD-\uFFFF';
+
+
+/**
+ * A practical pattern to identify strong RTL character. This pattern is not
+ * theoretically correct according to the Unicode standard. It is simplified
+ * for performance and small code size.
+ * @type {string}
+ * @private
+ */
+goog.i18n.bidi.rtlChars_ =
+    '\u0591-\u06EF\u06FA-\u07FF\u200F\uFB1D-\uFDFF\uFE70-\uFEFC';
+
+
+/**
+ * Simplified regular expression for an HTML tag (opening or closing) or an HTML
+ * escape. We might want to skip over such expressions when estimating the text
+ * directionality.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.htmlSkipReg_ = /<[^>]*>|&[^;]+;/g;
+
+
+/**
+ * Returns the input text with spaces instead of HTML tags or HTML escapes, if
+ * opt_isStripNeeded is true. Else returns the input as is.
+ * Useful for text directionality estimation.
+ * Note: the function should not be used in other contexts; it is not 100%
+ * correct, but rather a good-enough implementation for directionality
+ * estimation purposes.
+ * @param {string} str The given string.
+ * @param {boolean=} opt_isStripNeeded Whether to perform the stripping.
+ *     Default: false (to retain consistency with calling functions).
+ * @return {string} The given string cleaned of HTML tags / escapes.
+ * @private
+ */
+goog.i18n.bidi.stripHtmlIfNeeded_ = function(str, opt_isStripNeeded) {
+  return opt_isStripNeeded ? str.replace(goog.i18n.bidi.htmlSkipReg_, '') :
+      str;
+};
+
+
+/**
+ * Regular expression to check for RTL characters.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.rtlCharReg_ = new RegExp('[' + goog.i18n.bidi.rtlChars_ + ']');
+
+
+/**
+ * Regular expression to check for LTR characters.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.ltrCharReg_ = new RegExp('[' + goog.i18n.bidi.ltrChars_ + ']');
+
+
+/**
+ * Test whether the given string has any RTL characters in it.
+ * @param {string} str The given string that need to be tested.
+ * @param {boolean=} opt_isHtml Whether str is HTML / HTML-escaped.
+ *     Default: false.
+ * @return {boolean} Whether the string contains RTL characters.
+ */
+goog.i18n.bidi.hasAnyRtl = function(str, opt_isHtml) {
+  return goog.i18n.bidi.rtlCharReg_.test(goog.i18n.bidi.stripHtmlIfNeeded_(
+      str, opt_isHtml));
+};
+
+
+/**
+ * Test whether the given string has any RTL characters in it.
+ * @param {string} str The given string that need to be tested.
+ * @return {boolean} Whether the string contains RTL characters.
+ * @deprecated Use hasAnyRtl.
+ */
+goog.i18n.bidi.hasRtlChar = goog.i18n.bidi.hasAnyRtl;
+
+
+/**
+ * Test whether the given string has any LTR characters in it.
+ * @param {string} str The given string that need to be tested.
+ * @param {boolean=} opt_isHtml Whether str is HTML / HTML-escaped.
+ *     Default: false.
+ * @return {boolean} Whether the string contains LTR characters.
+ */
+goog.i18n.bidi.hasAnyLtr = function(str, opt_isHtml) {
+  return goog.i18n.bidi.ltrCharReg_.test(goog.i18n.bidi.stripHtmlIfNeeded_(
+      str, opt_isHtml));
+};
+
+
+/**
+ * Regular expression pattern to check if the first character in the string
+ * is LTR.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.ltrRe_ = new RegExp('^[' + goog.i18n.bidi.ltrChars_ + ']');
+
+
+/**
+ * Regular expression pattern to check if the first character in the string
+ * is RTL.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.rtlRe_ = new RegExp('^[' + goog.i18n.bidi.rtlChars_ + ']');
+
+
+/**
+ * Check if the first character in the string is RTL or not.
+ * @param {string} str The given string that need to be tested.
+ * @return {boolean} Whether the first character in str is an RTL char.
+ */
+goog.i18n.bidi.isRtlChar = function(str) {
+  return goog.i18n.bidi.rtlRe_.test(str);
+};
+
+
+/**
+ * Check if the first character in the string is LTR or not.
+ * @param {string} str The given string that need to be tested.
+ * @return {boolean} Whether the first character in str is an LTR char.
+ */
+goog.i18n.bidi.isLtrChar = function(str) {
+  return goog.i18n.bidi.ltrRe_.test(str);
+};
+
+
+/**
+ * Check if the first character in the string is neutral or not.
+ * @param {string} str The given string that need to be tested.
+ * @return {boolean} Whether the first character in str is a neutral char.
+ */
+goog.i18n.bidi.isNeutralChar = function(str) {
+  return !goog.i18n.bidi.isLtrChar(str) && !goog.i18n.bidi.isRtlChar(str);
+};
+
+
+/**
+ * Regular expressions to check if a piece of text is of LTR directionality
+ * on first character with strong directionality.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.ltrDirCheckRe_ = new RegExp(
+    '^[^' + goog.i18n.bidi.rtlChars_ + ']*[' + goog.i18n.bidi.ltrChars_ + ']');
+
+
+/**
+ * Regular expressions to check if a piece of text is of RTL directionality
+ * on first character with strong directionality.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.rtlDirCheckRe_ = new RegExp(
+    '^[^' + goog.i18n.bidi.ltrChars_ + ']*[' + goog.i18n.bidi.rtlChars_ + ']');
+
+
+/**
+ * Check whether the first strongly directional character (if any) is RTL.
+ * @param {string} str String being checked.
+ * @param {boolean=} opt_isHtml Whether str is HTML / HTML-escaped.
+ *     Default: false.
+ * @return {boolean} Whether RTL directionality is detected using the first
+ *     strongly-directional character method.
+ */
+goog.i18n.bidi.startsWithRtl = function(str, opt_isHtml) {
+  return goog.i18n.bidi.rtlDirCheckRe_.test(goog.i18n.bidi.stripHtmlIfNeeded_(
+      str, opt_isHtml));
+};
+
+
+/**
+ * Check whether the first strongly directional character (if any) is RTL.
+ * @param {string} str String being checked.
+ * @param {boolean=} opt_isHtml Whether str is HTML / HTML-escaped.
+ *     Default: false.
+ * @return {boolean} Whether RTL directionality is detected using the first
+ *     strongly-directional character method.
+ * @deprecated Use startsWithRtl.
+ */
+goog.i18n.bidi.isRtlText = goog.i18n.bidi.startsWithRtl;
+
+
+/**
+ * Check whether the first strongly directional character (if any) is LTR.
+ * @param {string} str String being checked.
+ * @param {boolean=} opt_isHtml Whether str is HTML / HTML-escaped.
+ *     Default: false.
+ * @return {boolean} Whether LTR directionality is detected using the first
+ *     strongly-directional character method.
+ */
+goog.i18n.bidi.startsWithLtr = function(str, opt_isHtml) {
+  return goog.i18n.bidi.ltrDirCheckRe_.test(goog.i18n.bidi.stripHtmlIfNeeded_(
+      str, opt_isHtml));
+};
+
+
+/**
+ * Check whether the first strongly directional character (if any) is LTR.
+ * @param {string} str String being checked.
+ * @param {boolean=} opt_isHtml Whether str is HTML / HTML-escaped.
+ *     Default: false.
+ * @return {boolean} Whether LTR directionality is detected using the first
+ *     strongly-directional character method.
+ * @deprecated Use startsWithLtr.
+ */
+goog.i18n.bidi.isLtrText = goog.i18n.bidi.startsWithLtr;
+
+
+/**
+ * Regular expression to check if a string looks like something that must
+ * always be LTR even in RTL text, e.g. a URL. When estimating the
+ * directionality of text containing these, we treat these as weakly LTR,
+ * like numbers.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.isRequiredLtrRe_ = /^http:\/\/.*/;
+
+
+/**
+ * Check whether the input string either contains no strongly directional
+ * characters or looks like a url.
+ * @param {string} str String being checked.
+ * @param {boolean=} opt_isHtml Whether str is HTML / HTML-escaped.
+ *     Default: false.
+ * @return {boolean} Whether neutral directionality is detected.
+ */
+goog.i18n.bidi.isNeutralText = function(str, opt_isHtml) {
+  str = goog.i18n.bidi.stripHtmlIfNeeded_(str, opt_isHtml);
+  return goog.i18n.bidi.isRequiredLtrRe_.test(str) ||
+      !goog.i18n.bidi.hasAnyLtr(str) && !goog.i18n.bidi.hasAnyRtl(str);
+};
+
+
+/**
+ * Regular expressions to check if the last strongly-directional character in a
+ * piece of text is LTR.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.ltrExitDirCheckRe_ = new RegExp(
+    '[' + goog.i18n.bidi.ltrChars_ + '][^' + goog.i18n.bidi.rtlChars_ + ']*$');
+
+
+/**
+ * Regular expressions to check if the last strongly-directional character in a
+ * piece of text is RTL.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.rtlExitDirCheckRe_ = new RegExp(
+    '[' + goog.i18n.bidi.rtlChars_ + '][^' + goog.i18n.bidi.ltrChars_ + ']*$');
+
+
+/**
+ * Check if the exit directionality a piece of text is LTR, i.e. if the last
+ * strongly-directional character in the string is LTR.
+ * @param {string} str String being checked.
+ * @param {boolean=} opt_isHtml Whether str is HTML / HTML-escaped.
+ *     Default: false.
+ * @return {boolean} Whether LTR exit directionality was detected.
+ */
+goog.i18n.bidi.endsWithLtr = function(str, opt_isHtml) {
+  return goog.i18n.bidi.ltrExitDirCheckRe_.test(
+      goog.i18n.bidi.stripHtmlIfNeeded_(str, opt_isHtml));
+};
+
+
+/**
+ * Check if the exit directionality a piece of text is LTR, i.e. if the last
+ * strongly-directional character in the string is LTR.
+ * @param {string} str String being checked.
+ * @param {boolean=} opt_isHtml Whether str is HTML / HTML-escaped.
+ *     Default: false.
+ * @return {boolean} Whether LTR exit directionality was detected.
+ * @deprecated Use endsWithLtr.
+ */
+goog.i18n.bidi.isLtrExitText = goog.i18n.bidi.endsWithLtr;
+
+
+/**
+ * Check if the exit directionality a piece of text is RTL, i.e. if the last
+ * strongly-directional character in the string is RTL.
+ * @param {string} str String being checked.
+ * @param {boolean=} opt_isHtml Whether str is HTML / HTML-escaped.
+ *     Default: false.
+ * @return {boolean} Whether RTL exit directionality was detected.
+ */
+goog.i18n.bidi.endsWithRtl = function(str, opt_isHtml) {
+  return goog.i18n.bidi.rtlExitDirCheckRe_.test(
+      goog.i18n.bidi.stripHtmlIfNeeded_(str, opt_isHtml));
+};
+
+
+/**
+ * Check if the exit directionality a piece of text is RTL, i.e. if the last
+ * strongly-directional character in the string is RTL.
+ * @param {string} str String being checked.
+ * @param {boolean=} opt_isHtml Whether str is HTML / HTML-escaped.
+ *     Default: false.
+ * @return {boolean} Whether RTL exit directionality was detected.
+ * @deprecated Use endsWithRtl.
+ */
+goog.i18n.bidi.isRtlExitText = goog.i18n.bidi.endsWithRtl;
+
+
+/**
+ * A regular expression for matching right-to-left language codes.
+ * See {@link #isRtlLanguage} for the design.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.rtlLocalesRe_ = new RegExp(
+    '^(ar|ckb|dv|he|iw|fa|nqo|ps|sd|ug|ur|yi|' +
+    '.*[-_](Arab|Hebr|Thaa|Nkoo|Tfng))' +
+    '(?!.*[-_](Latn|Cyrl)($|-|_))($|-|_)',
+    'i');
+
+
+/**
+ * Check if a BCP 47 / III language code indicates an RTL language, i.e. either:
+ * - a language code explicitly specifying one of the right-to-left scripts,
+ *   e.g. "az-Arab", or<p>
+ * - a language code specifying one of the languages normally written in a
+ *   right-to-left script, e.g. "fa" (Farsi), except ones explicitly specifying
+ *   Latin or Cyrillic script (which are the usual LTR alternatives).<p>
+ * The list of right-to-left scripts appears in the 100-199 range in
+ * http://www.unicode.org/iso15924/iso15924-num.html, of which Arabic and
+ * Hebrew are by far the most widely used. We also recognize Thaana, N'Ko, and
+ * Tifinagh, which also have significant modern usage. The rest (Syriac,
+ * Samaritan, Mandaic, etc.) seem to have extremely limited or no modern usage
+ * and are not recognized to save on code size.
+ * The languages usually written in a right-to-left script are taken as those
+ * with Suppress-Script: Hebr|Arab|Thaa|Nkoo|Tfng  in
+ * http://www.iana.org/assignments/language-subtag-registry,
+ * as well as Central (or Sorani) Kurdish (ckb), Sindhi (sd) and Uyghur (ug).
+ * Other subtags of the language code, e.g. regions like EG (Egypt), are
+ * ignored.
+ * @param {string} lang BCP 47 (a.k.a III) language code.
+ * @return {boolean} Whether the language code is an RTL language.
+ */
+goog.i18n.bidi.isRtlLanguage = function(lang) {
+  return goog.i18n.bidi.rtlLocalesRe_.test(lang);
+};
+
+
+/**
+ * Regular expression for bracket guard replacement in html.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.bracketGuardHtmlRe_ =
+    /(\(.*?\)+)|(\[.*?\]+)|(\{.*?\}+)|(&lt;.*?(&gt;)+)/g;
+
+
+/**
+ * Regular expression for bracket guard replacement in text.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.bracketGuardTextRe_ =
+    /(\(.*?\)+)|(\[.*?\]+)|(\{.*?\}+)|(<.*?>+)/g;
+
+
+/**
+ * Apply bracket guard using html span tag. This is to address the problem of
+ * messy bracket display frequently happens in RTL layout.
+ * @param {string} s The string that need to be processed.
+ * @param {boolean=} opt_isRtlContext specifies default direction (usually
+ *     direction of the UI).
+ * @return {string} The processed string, with all bracket guarded.
+ */
+goog.i18n.bidi.guardBracketInHtml = function(s, opt_isRtlContext) {
+  var useRtl = opt_isRtlContext === undefined ?
+      goog.i18n.bidi.hasAnyRtl(s) : opt_isRtlContext;
+  if (useRtl) {
+    return s.replace(goog.i18n.bidi.bracketGuardHtmlRe_,
+        '<span dir=rtl>$&</span>');
+  }
+  return s.replace(goog.i18n.bidi.bracketGuardHtmlRe_,
+      '<span dir=ltr>$&</span>');
+};
+
+
+/**
+ * Apply bracket guard using LRM and RLM. This is to address the problem of
+ * messy bracket display frequently happens in RTL layout.
+ * This version works for both plain text and html. But it does not work as
+ * good as guardBracketInHtml in some cases.
+ * @param {string} s The string that need to be processed.
+ * @param {boolean=} opt_isRtlContext specifies default direction (usually
+ *     direction of the UI).
+ * @return {string} The processed string, with all bracket guarded.
+ */
+goog.i18n.bidi.guardBracketInText = function(s, opt_isRtlContext) {
+  var useRtl = opt_isRtlContext === undefined ?
+      goog.i18n.bidi.hasAnyRtl(s) : opt_isRtlContext;
+  var mark = useRtl ? goog.i18n.bidi.Format.RLM : goog.i18n.bidi.Format.LRM;
+  return s.replace(goog.i18n.bidi.bracketGuardTextRe_, mark + '$&' + mark);
+};
+
+
+/**
+ * Enforce the html snippet in RTL directionality regardless overall context.
+ * If the html piece was enclosed by tag, dir will be applied to existing
+ * tag, otherwise a span tag will be added as wrapper. For this reason, if
+ * html snippet start with with tag, this tag must enclose the whole piece. If
+ * the tag already has a dir specified, this new one will override existing
+ * one in behavior (tested on FF and IE).
+ * @param {string} html The string that need to be processed.
+ * @return {string} The processed string, with directionality enforced to RTL.
+ */
+goog.i18n.bidi.enforceRtlInHtml = function(html) {
+  if (html.charAt(0) == '<') {
+    return html.replace(/<\w+/, '$& dir=rtl');
+  }
+  // '\n' is important for FF so that it won't incorrectly merge span groups
+  return '\n<span dir=rtl>' + html + '</span>';
+};
+
+
+/**
+ * Enforce RTL on both end of the given text piece using unicode BiDi formatting
+ * characters RLE and PDF.
+ * @param {string} text The piece of text that need to be wrapped.
+ * @return {string} The wrapped string after process.
+ */
+goog.i18n.bidi.enforceRtlInText = function(text) {
+  return goog.i18n.bidi.Format.RLE + text + goog.i18n.bidi.Format.PDF;
+};
+
+
+/**
+ * Enforce the html snippet in RTL directionality regardless overall context.
+ * If the html piece was enclosed by tag, dir will be applied to existing
+ * tag, otherwise a span tag will be added as wrapper. For this reason, if
+ * html snippet start with with tag, this tag must enclose the whole piece. If
+ * the tag already has a dir specified, this new one will override existing
+ * one in behavior (tested on FF and IE).
+ * @param {string} html The string that need to be processed.
+ * @return {string} The processed string, with directionality enforced to RTL.
+ */
+goog.i18n.bidi.enforceLtrInHtml = function(html) {
+  if (html.charAt(0) == '<') {
+    return html.replace(/<\w+/, '$& dir=ltr');
+  }
+  // '\n' is important for FF so that it won't incorrectly merge span groups
+  return '\n<span dir=ltr>' + html + '</span>';
+};
+
+
+/**
+ * Enforce LTR on both end of the given text piece using unicode BiDi formatting
+ * characters LRE and PDF.
+ * @param {string} text The piece of text that need to be wrapped.
+ * @return {string} The wrapped string after process.
+ */
+goog.i18n.bidi.enforceLtrInText = function(text) {
+  return goog.i18n.bidi.Format.LRE + text + goog.i18n.bidi.Format.PDF;
+};
+
+
+/**
+ * Regular expression to find dimensions such as "padding: .3 0.4ex 5px 6;"
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.dimensionsRe_ =
+    /:\s*([.\d][.\w]*)\s+([.\d][.\w]*)\s+([.\d][.\w]*)\s+([.\d][.\w]*)/g;
+
+
+/**
+ * Regular expression for left.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.leftRe_ = /left/gi;
+
+
+/**
+ * Regular expression for right.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.rightRe_ = /right/gi;
+
+
+/**
+ * Placeholder regular expression for swapping.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.tempRe_ = /%%%%/g;
+
+
+/**
+ * Swap location parameters and 'left'/'right' in CSS specification. The
+ * processed string will be suited for RTL layout. Though this function can
+ * cover most cases, there are always exceptions. It is suggested to put
+ * those exceptions in separate group of CSS string.
+ * @param {string} cssStr CSS spefication string.
+ * @return {string} Processed CSS specification string.
+ */
+goog.i18n.bidi.mirrorCSS = function(cssStr) {
+  return cssStr.
+      // reverse dimensions
+      replace(goog.i18n.bidi.dimensionsRe_, ':$1 $4 $3 $2').
+      replace(goog.i18n.bidi.leftRe_, '%%%%').          // swap left and right
+      replace(goog.i18n.bidi.rightRe_, goog.i18n.bidi.LEFT).
+      replace(goog.i18n.bidi.tempRe_, goog.i18n.bidi.RIGHT);
+};
+
+
+/**
+ * Regular expression for hebrew double quote substitution, finding quote
+ * directly after hebrew characters.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.doubleQuoteSubstituteRe_ = /([\u0591-\u05f2])"/g;
+
+
+/**
+ * Regular expression for hebrew single quote substitution, finding quote
+ * directly after hebrew characters.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.singleQuoteSubstituteRe_ = /([\u0591-\u05f2])'/g;
+
+
+/**
+ * Replace the double and single quote directly after a Hebrew character with
+ * GERESH and GERSHAYIM. In such case, most likely that's user intention.
+ * @param {string} str String that need to be processed.
+ * @return {string} Processed string with double/single quote replaced.
+ */
+goog.i18n.bidi.normalizeHebrewQuote = function(str) {
+  return str.
+      replace(goog.i18n.bidi.doubleQuoteSubstituteRe_, '$1\u05f4').
+      replace(goog.i18n.bidi.singleQuoteSubstituteRe_, '$1\u05f3');
+};
+
+
+/**
+ * Regular expression to split a string into "words" for directionality
+ * estimation based on relative word counts.
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.wordSeparatorRe_ = /\s+/;
+
+
+/**
+ * Regular expression to check if a string contains any numerals. Used to
+ * differentiate between completely neutral strings and those containing
+ * numbers, which are weakly LTR.
+ *
+ * Native Arabic digits (\u0660 - \u0669) are not included because although they
+ * do flow left-to-right inside a number, this is the case even if the  overall
+ * directionality is RTL, and a mathematical expression using these digits is
+ * supposed to flow right-to-left overall, including unary plus and minus
+ * appearing to the right of a number, and this does depend on the overall
+ * directionality being RTL. The digits used in Farsi (\u06F0 - \u06F9), on the
+ * other hand, are included, since Farsi math (including unary plus and minus)
+ * does flow left-to-right.
+ *
+ * @type {RegExp}
+ * @private
+ */
+goog.i18n.bidi.hasNumeralsRe_ = /[\d\u06f0-\u06f9]/;
+
+
+/**
+ * This constant controls threshold of RTL directionality.
+ * @type {number}
+ * @private
+ */
+goog.i18n.bidi.rtlDetectionThreshold_ = 0.40;
+
+
+/**
+ * Estimates the directionality of a string based on relative word counts.
+ * If the number of RTL words is above a certain percentage of the total number
+ * of strongly directional words, returns RTL.
+ * Otherwise, if any words are strongly or weakly LTR, returns LTR.
+ * Otherwise, returns UNKNOWN, which is used to mean "neutral".
+ * Numbers are counted as weakly LTR.
+ * @param {string} str The string to be checked.
+ * @param {boolean=} opt_isHtml Whether str is HTML / HTML-escaped.
+ *     Default: false.
+ * @return {goog.i18n.bidi.Dir} Estimated overall directionality of {@code str}.
+ */
+goog.i18n.bidi.estimateDirection = function(str, opt_isHtml) {
+  var rtlCount = 0;
+  var totalCount = 0;
+  var hasWeaklyLtr = false;
+  var tokens = goog.i18n.bidi.stripHtmlIfNeeded_(str, opt_isHtml).
+      split(goog.i18n.bidi.wordSeparatorRe_);
+  for (var i = 0; i < tokens.length; i++) {
+    var token = tokens[i];
+    if (goog.i18n.bidi.startsWithRtl(token)) {
+      rtlCount++;
+      totalCount++;
+    } else if (goog.i18n.bidi.isRequiredLtrRe_.test(token)) {
+      hasWeaklyLtr = true;
+    } else if (goog.i18n.bidi.hasAnyLtr(token)) {
+      totalCount++;
+    } else if (goog.i18n.bidi.hasNumeralsRe_.test(token)) {
+      hasWeaklyLtr = true;
+    }
+  }
+
+  return totalCount == 0 ?
+      (hasWeaklyLtr ? goog.i18n.bidi.Dir.LTR : goog.i18n.bidi.Dir.NEUTRAL) :
+      (rtlCount / totalCount > goog.i18n.bidi.rtlDetectionThreshold_ ?
+          goog.i18n.bidi.Dir.RTL : goog.i18n.bidi.Dir.LTR);
+};
+
+
+/**
+ * Check the directionality of a piece of text, return true if the piece of
+ * text should be laid out in RTL direction.
+ * @param {string} str The piece of text that need to be detected.
+ * @param {boolean=} opt_isHtml Whether str is HTML / HTML-escaped.
+ *     Default: false.
+ * @return {boolean} Whether this piece of text should be laid out in RTL.
+ */
+goog.i18n.bidi.detectRtlDirectionality = function(str, opt_isHtml) {
+  return goog.i18n.bidi.estimateDirection(str, opt_isHtml) ==
+      goog.i18n.bidi.Dir.RTL;
+};
+
+
+/**
+ * Sets text input element's directionality and text alignment based on a
+ * given directionality. Does nothing if the given directionality is unknown or
+ * neutral.
+ * @param {Element} element Input field element to set directionality to.
+ * @param {goog.i18n.bidi.Dir|number|boolean|null} dir Desired directionality,
+ *     given in one of the following formats:
+ *     1. A goog.i18n.bidi.Dir constant.
+ *     2. A number (positive = LRT, negative = RTL, 0 = neutral).
+ *     3. A boolean (true = RTL, false = LTR).
+ *     4. A null for unknown directionality.
+ */
+goog.i18n.bidi.setElementDirAndAlign = function(element, dir) {
+  if (element) {
+    dir = goog.i18n.bidi.toDir(dir);
+    if (dir) {
+      element.style.textAlign =
+          dir == goog.i18n.bidi.Dir.RTL ?
+          goog.i18n.bidi.RIGHT : goog.i18n.bidi.LEFT;
+      element.dir = dir == goog.i18n.bidi.Dir.RTL ? 'rtl' : 'ltr';
+    }
+  }
+};
+
+
+/**
+ * Sets element dir based on estimated directionality of the given text.
+ * @param {!Element} element
+ * @param {string} text
+ */
+goog.i18n.bidi.setElementDirByTextDirectionality = function(element, text) {
+  switch (goog.i18n.bidi.estimateDirection(text)) {
+    case (goog.i18n.bidi.Dir.LTR):
+      element.dir = 'ltr';
+      break;
+    case (goog.i18n.bidi.Dir.RTL):
+      element.dir = 'rtl';
+      break;
+    default:
+      // Default for no direction, inherit from document.
+      element.removeAttribute('dir');
+  }
+};
+
+
+
+/**
+ * Strings that have an (optional) known direction.
+ *
+ * Implementations of this interface are string-like objects that carry an
+ * attached direction, if known.
+ * @interface
+ */
+goog.i18n.bidi.DirectionalString = function() {};
+
+
+/**
+ * Interface marker of the DirectionalString interface.
+ *
+ * This property can be used to determine at runtime whether or not an object
+ * implements this interface.  All implementations of this interface set this
+ * property to {@code true}.
+ * @type {boolean}
+ */
+goog.i18n.bidi.DirectionalString.prototype.
+    implementsGoogI18nBidiDirectionalString;
+
+
+/**
+ * Retrieves this object's known direction (if any).
+ * @return {?goog.i18n.bidi.Dir} The known direction. Null if unknown.
+ */
+goog.i18n.bidi.DirectionalString.prototype.getDirection;
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview The SafeUrl type and its builders.
+ *
+ * TODO(xtof): Link to document stating type contract.
+ */
+
+goog.provide('goog.html.SafeUrl');
+
+goog.require('goog.asserts');
+goog.require('goog.fs.url');
+goog.require('goog.i18n.bidi.Dir');
+goog.require('goog.i18n.bidi.DirectionalString');
+goog.require('goog.string.Const');
+goog.require('goog.string.TypedString');
+
+
+
+/**
+ * A string that is safe to use in URL context in DOM APIs and HTML documents.
+ *
+ * A SafeUrl is a string-like object that carries the security type contract
+ * that its value as a string will not cause untrusted script execution
+ * when evaluated as a hyperlink URL in a browser.
+ *
+ * Values of this type are guaranteed to be safe to use in URL/hyperlink
+ * contexts, such as, assignment to URL-valued DOM properties, or
+ * interpolation into a HTML template in URL context (e.g., inside a href
+ * attribute), in the sense that the use will not result in a
+ * Cross-Site-Scripting vulnerability.
+ *
+ * Note that, as documented in {@code goog.html.SafeUrl.unwrap}, this type's
+ * contract does not guarantee that instances are safe to interpolate into HTML
+ * without appropriate escaping.
+ *
+ * Note also that this type's contract does not imply any guarantees regarding
+ * the resource the URL refers to.  In particular, SafeUrls are <b>not</b>
+ * safe to use in a context where the referred-to resource is interpreted as
+ * trusted code, e.g., as the src of a script tag.
+ *
+ * Instances of this type must be created via the factory methods
+ * ({@code goog.html.SafeUrl.fromConstant}, {@code goog.html.SafeUrl.sanitize}),
+ * etc and not by invoking its constructor.  The constructor intentionally
+ * takes no parameters and the type is immutable; hence only a default instance
+ * corresponding to the empty string can be obtained via constructor invocation.
+ *
+ * @see goog.html.SafeUrl#fromConstant
+ * @see goog.html.SafeUrl#from
+ * @see goog.html.SafeUrl#sanitize
+ * @constructor
+ * @final
+ * @struct
+ * @implements {goog.i18n.bidi.DirectionalString}
+ * @implements {goog.string.TypedString}
+ */
+goog.html.SafeUrl = function() {
+  /**
+   * The contained value of this SafeUrl.  The field has a purposely ugly
+   * name to make (non-compiled) code that attempts to directly access this
+   * field stand out.
+   * @private {string}
+   */
+  this.privateDoNotAccessOrElseSafeHtmlWrappedValue_ = '';
+
+  /**
+   * A type marker used to implement additional run-time type checking.
+   * @see goog.html.SafeUrl#unwrap
+   * @const
+   * @private
+   */
+  this.SAFE_URL_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ =
+      goog.html.SafeUrl.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_;
+};
+
+
+/**
+ * The innocuous string generated by goog.html.SafeUrl.sanitize when passed
+ * an unsafe URL.
+ *
+ * about:invalid is registered in
+ * http://www.w3.org/TR/css3-values/#about-invalid.
+ * http://tools.ietf.org/html/rfc6694#section-2.2.1 permits about URLs to
+ * contain a fragment, which is not to be considered when determining if an
+ * about URL is well-known.
+ *
+ * Using about:invalid seems preferable to using a fixed data URL, since
+ * browsers might choose to not report CSP violations on it, as legitimate
+ * CSS function calls to attr() can result in this URL being produced. It is
+ * also a standard URL which matches exactly the semantics we need:
+ * "The about:invalid URI references a non-existent document with a generic
+ * error condition. It can be used when a URI is necessary, but the default
+ * value shouldn't be resolveable as any type of document".
+ *
+ * @const {string}
+ */
+goog.html.SafeUrl.INNOCUOUS_STRING = 'about:invalid#zClosurez';
+
+
+/**
+ * @override
+ * @const
+ */
+goog.html.SafeUrl.prototype.implementsGoogStringTypedString = true;
+
+
+/**
+ * Returns this SafeUrl's value a string.
+ *
+ * IMPORTANT: In code where it is security relevant that an object's type is
+ * indeed {@code SafeUrl}, use {@code goog.html.SafeUrl.unwrap} instead of this
+ * method. If in doubt, assume that it's security relevant. In particular, note
+ * that goog.html functions which return a goog.html type do not guarantee that
+ * the returned instance is of the right type. For example:
+ *
+ * <pre>
+ * var fakeSafeHtml = new String('fake');
+ * fakeSafeHtml.__proto__ = goog.html.SafeHtml.prototype;
+ * var newSafeHtml = goog.html.SafeHtml.htmlEscape(fakeSafeHtml);
+ * // newSafeHtml is just an alias for fakeSafeHtml, it's passed through by
+ * // goog.html.SafeHtml.htmlEscape() as fakeSafeHtml instanceof
+ * // goog.html.SafeHtml.
+ * </pre>
+ *
+ * IMPORTANT: The guarantees of the SafeUrl type contract only extend to the
+ * behavior of browsers when interpreting URLs. Values of SafeUrl objects MUST
+ * be appropriately escaped before embedding in a HTML document. Note that the
+ * required escaping is context-sensitive (e.g. a different escaping is
+ * required for embedding a URL in a style property within a style
+ * attribute, as opposed to embedding in a href attribute).
+ *
+ * @see goog.html.SafeUrl#unwrap
+ * @override
+ */
+goog.html.SafeUrl.prototype.getTypedStringValue = function() {
+  return this.privateDoNotAccessOrElseSafeHtmlWrappedValue_;
+};
+
+
+/**
+ * @override
+ * @const
+ */
+goog.html.SafeUrl.prototype.implementsGoogI18nBidiDirectionalString = true;
+
+
+/**
+ * Returns this URLs directionality, which is always {@code LTR}.
+ * @override
+ */
+goog.html.SafeUrl.prototype.getDirection = function() {
+  return goog.i18n.bidi.Dir.LTR;
+};
+
+
+if (goog.DEBUG) {
+  /**
+   * Returns a debug string-representation of this value.
+   *
+   * To obtain the actual string value wrapped in a SafeUrl, use
+   * {@code goog.html.SafeUrl.unwrap}.
+   *
+   * @see goog.html.SafeUrl#unwrap
+   * @override
+   */
+  goog.html.SafeUrl.prototype.toString = function() {
+    return 'SafeUrl{' + this.privateDoNotAccessOrElseSafeHtmlWrappedValue_ +
+        '}';
+  };
+}
+
+
+/**
+ * Performs a runtime check that the provided object is indeed a SafeUrl
+ * object, and returns its value.
+ *
+ * IMPORTANT: The guarantees of the SafeUrl type contract only extend to the
+ * behavior of  browsers when interpreting URLs. Values of SafeUrl objects MUST
+ * be appropriately escaped before embedding in a HTML document. Note that the
+ * required escaping is context-sensitive (e.g. a different escaping is
+ * required for embedding a URL in a style property within a style
+ * attribute, as opposed to embedding in a href attribute).
+ *
+ * @param {!goog.html.SafeUrl} safeUrl The object to extract from.
+ * @return {string} The SafeUrl object's contained string, unless the run-time
+ *     type check fails. In that case, {@code unwrap} returns an innocuous
+ *     string, or, if assertions are enabled, throws
+ *     {@code goog.asserts.AssertionError}.
+ */
+goog.html.SafeUrl.unwrap = function(safeUrl) {
+  // Perform additional Run-time type-checking to ensure that safeUrl is indeed
+  // an instance of the expected type.  This provides some additional protection
+  // against security bugs due to application code that disables type checks.
+  // Specifically, the following checks are performed:
+  // 1. The object is an instance of the expected type.
+  // 2. The object is not an instance of a subclass.
+  // 3. The object carries a type marker for the expected type. "Faking" an
+  // object requires a reference to the type marker, which has names intended
+  // to stand out in code reviews.
+  if (safeUrl instanceof goog.html.SafeUrl &&
+      safeUrl.constructor === goog.html.SafeUrl &&
+      safeUrl.SAFE_URL_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ ===
+          goog.html.SafeUrl.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_) {
+    return safeUrl.privateDoNotAccessOrElseSafeHtmlWrappedValue_;
+  } else {
+    goog.asserts.fail('expected object of type SafeUrl, got \'' +
+                      safeUrl + '\'');
+    return 'type_error:SafeUrl';
+
+  }
+};
+
+
+/**
+ * Creates a SafeUrl object from a compile-time constant string.
+ *
+ * Compile-time constant strings are inherently program-controlled and hence
+ * trusted.
+ *
+ * @param {!goog.string.Const} url A compile-time-constant string from which to
+ *         create a SafeUrl.
+ * @return {!goog.html.SafeUrl} A SafeUrl object initialized to {@code url}.
+ */
+goog.html.SafeUrl.fromConstant = function(url) {
+  return goog.html.SafeUrl.createSafeUrlSecurityPrivateDoNotAccessOrElse(
+      goog.string.Const.unwrap(url));
+};
+
+
+/**
+ * A pattern that matches Blob or data types that can have SafeUrls created
+ * from URL.createObjectURL(blob) or via a data: URI.  Only matches image and
+ * video types, currently.
+ * @const
+ * @private
+ */
+goog.html.SAFE_MIME_TYPE_PATTERN_ =
+    /^(?:image\/(?:bmp|gif|jpeg|jpg|png|tiff|webp)|video\/(?:mpeg|mp4|ogg|webm))$/i;
+
+
+/**
+ * Creates a SafeUrl wrapping a blob URL for the given {@code blob}.
+ *
+ * The blob URL is created with {@code URL.createObjectURL}. If the MIME type
+ * for {@code blob} is not of a known safe image or video MIME type, then the
+ * SafeUrl will wrap {@link #INNOCUOUS_STRING}.
+ *
+ * @see http://www.w3.org/TR/FileAPI/#url
+ * @param {!Blob} blob
+ * @return {!goog.html.SafeUrl} The blob URL, or an innocuous string wrapped
+ *   as a SafeUrl.
+ */
+goog.html.SafeUrl.fromBlob = function(blob) {
+  var url = goog.html.SAFE_MIME_TYPE_PATTERN_.test(blob.type) ?
+      goog.fs.url.createObjectUrl(blob) : goog.html.SafeUrl.INNOCUOUS_STRING;
+  return goog.html.SafeUrl.createSafeUrlSecurityPrivateDoNotAccessOrElse(url);
+};
+
+
+/**
+ * Matches a base-64 data URL, with the first match group being the MIME type.
+ * @const
+ * @private
+ */
+goog.html.DATA_URL_PATTERN_ = /^data:([^;,]*);base64,[a-z0-9+\/]+=*$/i;
+
+
+/**
+ * Creates a SafeUrl wrapping a data: URL, after validating it matches a
+ * known-safe image or video MIME type.
+ *
+ * @param {string} dataUrl A valid base64 data URL with one of the whitelisted
+ *     image or video MIME types.
+ * @return {!goog.html.SafeUrl} A matching safe URL, or {@link INNOCUOUS_STRING}
+ *     wrapped as a SafeUrl if it does not pass.
+ */
+goog.html.SafeUrl.fromDataUrl = function(dataUrl) {
+  // There's a slight risk here that a browser sniffs the content type if it
+  // doesn't know the MIME type and executes HTML within the data: URL. For this
+  // to cause XSS it would also have to execute the HTML in the same origin
+  // of the page with the link. It seems unlikely that both of these will
+  // happen, particularly in not really old IEs.
+  var match = dataUrl.match(goog.html.DATA_URL_PATTERN_);
+  var valid = match && goog.html.SAFE_MIME_TYPE_PATTERN_.test(match[1]);
+  return goog.html.SafeUrl.createSafeUrlSecurityPrivateDoNotAccessOrElse(
+      valid ? dataUrl : goog.html.SafeUrl.INNOCUOUS_STRING);
+};
+
+
+/**
+ * A pattern that recognizes a commonly useful subset of URLs that satisfy
+ * the SafeUrl contract.
+ *
+ * This regular expression matches a subset of URLs that will not cause script
+ * execution if used in URL context within a HTML document. Specifically, this
+ * regular expression matches if (comment from here on and regex copied from
+ * Soy's EscapingConventions):
+ * (1) Either a protocol in a whitelist (http, https, mailto or ftp).
+ * (2) or no protocol.  A protocol must be followed by a colon. The below
+ *     allows that by allowing colons only after one of the characters [/?#].
+ *     A colon after a hash (#) must be in the fragment.
+ *     Otherwise, a colon after a (?) must be in a query.
+ *     Otherwise, a colon after a single solidus (/) must be in a path.
+ *     Otherwise, a colon after a double solidus (//) must be in the authority
+ *     (before port).
+ *
+ * The pattern disallows &, used in HTML entity declarations before
+ * one of the characters in [/?#]. This disallows HTML entities used in the
+ * protocol name, which should never happen, e.g. "h&#116;tp" for "http".
+ * It also disallows HTML entities in the first path part of a relative path,
+ * e.g. "foo&lt;bar/baz".  Our existing escaping functions should not produce
+ * that. More importantly, it disallows masking of a colon,
+ * e.g. "javascript&#58;...".
+ *
+ * @private
+ * @const {!RegExp}
+ */
+goog.html.SAFE_URL_PATTERN_ =
+    /^(?:(?:https?|mailto|ftp):|[^&:/?#]*(?:[/?#]|$))/i;
+
+
+/**
+ * Creates a SafeUrl object from {@code url}. If {@code url} is a
+ * goog.html.SafeUrl then it is simply returned. Otherwise the input string is
+ * validated to match a pattern of commonly used safe URLs. The string is
+ * converted to UTF-8 and non-whitelisted characters are percent-encoded. The
+ * string wrapped by the created SafeUrl will thus contain only ASCII printable
+ * characters.
+ *
+ * {@code url} may be a URL with the http, https, mailto or ftp scheme,
+ * or a relative URL (i.e., a URL without a scheme; specifically, a
+ * scheme-relative, absolute-path-relative, or path-relative URL).
+ *
+ * {@code url} is converted to UTF-8 and non-whitelisted characters are
+ * percent-encoded. Whitelisted characters are '%' and, from RFC 3986,
+ * unreserved characters and reserved characters, with the exception of '\'',
+ * '(' and ')'. This ensures the the SafeUrl contains only ASCII-printable
+ * characters and reduces the chance of security bugs were it to be
+ * interpolated into a specific context without the necessary escaping.
+ *
+ * If {@code url} fails validation or does not UTF-16 decode correctly
+ * (JavaScript strings are UTF-16 encoded), this function returns a SafeUrl
+ * object containing an innocuous string, goog.html.SafeUrl.INNOCUOUS_STRING.
+ *
+ * @see http://url.spec.whatwg.org/#concept-relative-url
+ * @param {string|!goog.string.TypedString} url The URL to validate.
+ * @return {!goog.html.SafeUrl} The validated URL, wrapped as a SafeUrl.
+ */
+goog.html.SafeUrl.sanitize = function(url) {
+  if (url instanceof goog.html.SafeUrl) {
+    return url;
+  }
+  else if (url.implementsGoogStringTypedString) {
+    url = url.getTypedStringValue();
+  } else {
+    url = String(url);
+  }
+  if (!goog.html.SAFE_URL_PATTERN_.test(url)) {
+    url = goog.html.SafeUrl.INNOCUOUS_STRING;
+  }
+  return goog.html.SafeUrl.createSafeUrlSecurityPrivateDoNotAccessOrElse(url);
+};
+
+
+/**
+ * Type marker for the SafeUrl type, used to implement additional run-time
+ * type checking.
+ * @const {!Object}
+ * @private
+ */
+goog.html.SafeUrl.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ = {};
+
+
+/**
+ * Package-internal utility method to create SafeUrl instances.
+ *
+ * @param {string} url The string to initialize the SafeUrl object with.
+ * @return {!goog.html.SafeUrl} The initialized SafeUrl object.
+ * @package
+ */
+goog.html.SafeUrl.createSafeUrlSecurityPrivateDoNotAccessOrElse = function(
+    url) {
+  var safeUrl = new goog.html.SafeUrl();
+  safeUrl.privateDoNotAccessOrElseSafeHtmlWrappedValue_ = url;
+  return safeUrl;
+};
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview The TrustedResourceUrl type and its builders.
+ *
+ * TODO(xtof): Link to document stating type contract.
+ */
+
+goog.provide('goog.html.TrustedResourceUrl');
+
+goog.require('goog.asserts');
+goog.require('goog.i18n.bidi.Dir');
+goog.require('goog.i18n.bidi.DirectionalString');
+goog.require('goog.string.Const');
+goog.require('goog.string.TypedString');
+
+
+
+/**
+ * A URL which is under application control and from which script, CSS, and
+ * other resources that represent executable code, can be fetched.
+ *
+ * Given that the URL can only be constructed from strings under application
+ * control and is used to load resources, bugs resulting in a malformed URL
+ * should not have a security impact and are likely to be easily detectable
+ * during testing. Given the wide number of non-RFC compliant URLs in use,
+ * stricter validation could prevent some applications from being able to use
+ * this type.
+ *
+ * Instances of this type must be created via the factory method,
+ * ({@code goog.html.TrustedResourceUrl.fromConstant}), and not by invoking its
+ * constructor. The constructor intentionally takes no parameters and the type
+ * is immutable; hence only a default instance corresponding to the empty
+ * string can be obtained via constructor invocation.
+ *
+ * @see goog.html.TrustedResourceUrl#fromConstant
+ * @constructor
+ * @final
+ * @struct
+ * @implements {goog.i18n.bidi.DirectionalString}
+ * @implements {goog.string.TypedString}
+ */
+goog.html.TrustedResourceUrl = function() {
+  /**
+   * The contained value of this TrustedResourceUrl.  The field has a purposely
+   * ugly name to make (non-compiled) code that attempts to directly access this
+   * field stand out.
+   * @private {string}
+   */
+  this.privateDoNotAccessOrElseTrustedResourceUrlWrappedValue_ = '';
+
+  /**
+   * A type marker used to implement additional run-time type checking.
+   * @see goog.html.TrustedResourceUrl#unwrap
+   * @const
+   * @private
+   */
+  this.TRUSTED_RESOURCE_URL_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ =
+      goog.html.TrustedResourceUrl.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_;
+};
+
+
+/**
+ * @override
+ * @const
+ */
+goog.html.TrustedResourceUrl.prototype.implementsGoogStringTypedString = true;
+
+
+/**
+ * Returns this TrustedResourceUrl's value as a string.
+ *
+ * IMPORTANT: In code where it is security relevant that an object's type is
+ * indeed {@code TrustedResourceUrl}, use
+ * {@code goog.html.TrustedResourceUrl.unwrap} instead of this method. If in
+ * doubt, assume that it's security relevant. In particular, note that
+ * goog.html functions which return a goog.html type do not guarantee that
+ * the returned instance is of the right type. For example:
+ *
+ * <pre>
+ * var fakeSafeHtml = new String('fake');
+ * fakeSafeHtml.__proto__ = goog.html.SafeHtml.prototype;
+ * var newSafeHtml = goog.html.SafeHtml.htmlEscape(fakeSafeHtml);
+ * // newSafeHtml is just an alias for fakeSafeHtml, it's passed through by
+ * // goog.html.SafeHtml.htmlEscape() as fakeSafeHtml instanceof
+ * // goog.html.SafeHtml.
+ * </pre>
+ *
+ * @see goog.html.TrustedResourceUrl#unwrap
+ * @override
+ */
+goog.html.TrustedResourceUrl.prototype.getTypedStringValue = function() {
+  return this.privateDoNotAccessOrElseTrustedResourceUrlWrappedValue_;
+};
+
+
+/**
+ * @override
+ * @const
+ */
+goog.html.TrustedResourceUrl.prototype.implementsGoogI18nBidiDirectionalString =
+    true;
+
+
+/**
+ * Returns this URLs directionality, which is always {@code LTR}.
+ * @override
+ */
+goog.html.TrustedResourceUrl.prototype.getDirection = function() {
+  return goog.i18n.bidi.Dir.LTR;
+};
+
+
+if (goog.DEBUG) {
+  /**
+   * Returns a debug string-representation of this value.
+   *
+   * To obtain the actual string value wrapped in a TrustedResourceUrl, use
+   * {@code goog.html.TrustedResourceUrl.unwrap}.
+   *
+   * @see goog.html.TrustedResourceUrl#unwrap
+   * @override
+   */
+  goog.html.TrustedResourceUrl.prototype.toString = function() {
+    return 'TrustedResourceUrl{' +
+        this.privateDoNotAccessOrElseTrustedResourceUrlWrappedValue_ + '}';
+  };
+}
+
+
+/**
+ * Performs a runtime check that the provided object is indeed a
+ * TrustedResourceUrl object, and returns its value.
+ *
+ * @param {!goog.html.TrustedResourceUrl} trustedResourceUrl The object to
+ *     extract from.
+ * @return {string} The trustedResourceUrl object's contained string, unless
+ *     the run-time type check fails. In that case, {@code unwrap} returns an
+ *     innocuous string, or, if assertions are enabled, throws
+ *     {@code goog.asserts.AssertionError}.
+ */
+goog.html.TrustedResourceUrl.unwrap = function(trustedResourceUrl) {
+  // Perform additional Run-time type-checking to ensure that
+  // trustedResourceUrl is indeed an instance of the expected type.  This
+  // provides some additional protection against security bugs due to
+  // application code that disables type checks.
+  // Specifically, the following checks are performed:
+  // 1. The object is an instance of the expected type.
+  // 2. The object is not an instance of a subclass.
+  // 3. The object carries a type marker for the expected type. "Faking" an
+  // object requires a reference to the type marker, which has names intended
+  // to stand out in code reviews.
+  if (trustedResourceUrl instanceof goog.html.TrustedResourceUrl &&
+      trustedResourceUrl.constructor === goog.html.TrustedResourceUrl &&
+      trustedResourceUrl
+          .TRUSTED_RESOURCE_URL_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ ===
+              goog.html.TrustedResourceUrl
+                  .TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_) {
+    return trustedResourceUrl
+        .privateDoNotAccessOrElseTrustedResourceUrlWrappedValue_;
+  } else {
+    goog.asserts.fail('expected object of type TrustedResourceUrl, got \'' +
+                      trustedResourceUrl + '\'');
+    return 'type_error:TrustedResourceUrl';
+
+  }
+};
+
+
+/**
+ * Creates a TrustedResourceUrl object from a compile-time constant string.
+ *
+ * Compile-time constant strings are inherently program-controlled and hence
+ * trusted.
+ *
+ * @param {!goog.string.Const} url A compile-time-constant string from which to
+ *     create a TrustedResourceUrl.
+ * @return {!goog.html.TrustedResourceUrl} A TrustedResourceUrl object
+ *     initialized to {@code url}.
+ */
+goog.html.TrustedResourceUrl.fromConstant = function(url) {
+  return goog.html.TrustedResourceUrl
+      .createTrustedResourceUrlSecurityPrivateDoNotAccessOrElse(
+          goog.string.Const.unwrap(url));
+};
+
+
+/**
+ * Type marker for the TrustedResourceUrl type, used to implement additional
+ * run-time type checking.
+ * @const {!Object}
+ * @private
+ */
+goog.html.TrustedResourceUrl.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ = {};
+
+
+/**
+ * Package-internal utility method to create TrustedResourceUrl instances.
+ *
+ * @param {string} url The string to initialize the TrustedResourceUrl object
+ *     with.
+ * @return {!goog.html.TrustedResourceUrl} The initialized TrustedResourceUrl
+ *     object.
+ * @package
+ */
+goog.html.TrustedResourceUrl.
+    createTrustedResourceUrlSecurityPrivateDoNotAccessOrElse = function(url) {
+  var trustedResourceUrl = new goog.html.TrustedResourceUrl();
+  trustedResourceUrl.privateDoNotAccessOrElseTrustedResourceUrlWrappedValue_ =
+      url;
+  return trustedResourceUrl;
+};
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+/**
+ * @fileoverview The SafeHtml type and its builders.
+ *
+ * TODO(xtof): Link to document stating type contract.
+ */
+
+goog.provide('goog.html.SafeHtml');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.dom.TagName');
+goog.require('goog.dom.tags');
+goog.require('goog.html.SafeStyle');
+goog.require('goog.html.SafeStyleSheet');
+goog.require('goog.html.SafeUrl');
+goog.require('goog.html.TrustedResourceUrl');
+goog.require('goog.i18n.bidi.Dir');
+goog.require('goog.i18n.bidi.DirectionalString');
+goog.require('goog.object');
+goog.require('goog.string');
+goog.require('goog.string.Const');
+goog.require('goog.string.TypedString');
+
+
+
+/**
+ * A string that is safe to use in HTML context in DOM APIs and HTML documents.
+ *
+ * A SafeHtml is a string-like object that carries the security type contract
+ * that its value as a string will not cause untrusted script execution when
+ * evaluated as HTML in a browser.
+ *
+ * Values of this type are guaranteed to be safe to use in HTML contexts,
+ * such as, assignment to the innerHTML DOM property, or interpolation into
+ * a HTML template in HTML PC_DATA context, in the sense that the use will not
+ * result in a Cross-Site-Scripting vulnerability.
+ *
+ * Instances of this type must be created via the factory methods
+ * ({@code goog.html.SafeHtml.create}, {@code goog.html.SafeHtml.htmlEscape}),
+ * etc and not by invoking its constructor.  The constructor intentionally
+ * takes no parameters and the type is immutable; hence only a default instance
+ * corresponding to the empty string can be obtained via constructor invocation.
+ *
+ * @see goog.html.SafeHtml#create
+ * @see goog.html.SafeHtml#htmlEscape
+ * @constructor
+ * @final
+ * @struct
+ * @implements {goog.i18n.bidi.DirectionalString}
+ * @implements {goog.string.TypedString}
+ */
+goog.html.SafeHtml = function() {
+  /**
+   * The contained value of this SafeHtml.  The field has a purposely ugly
+   * name to make (non-compiled) code that attempts to directly access this
+   * field stand out.
+   * @private {string}
+   */
+  this.privateDoNotAccessOrElseSafeHtmlWrappedValue_ = '';
+
+  /**
+   * A type marker used to implement additional run-time type checking.
+   * @see goog.html.SafeHtml#unwrap
+   * @const
+   * @private
+   */
+  this.SAFE_HTML_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ =
+      goog.html.SafeHtml.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_;
+
+  /**
+   * This SafeHtml's directionality, or null if unknown.
+   * @private {?goog.i18n.bidi.Dir}
+   */
+  this.dir_ = null;
+};
+
+
+/**
+ * @override
+ * @const
+ */
+goog.html.SafeHtml.prototype.implementsGoogI18nBidiDirectionalString = true;
+
+
+/** @override */
+goog.html.SafeHtml.prototype.getDirection = function() {
+  return this.dir_;
+};
+
+
+/**
+ * @override
+ * @const
+ */
+goog.html.SafeHtml.prototype.implementsGoogStringTypedString = true;
+
+
+/**
+ * Returns this SafeHtml's value a string.
+ *
+ * IMPORTANT: In code where it is security relevant that an object's type is
+ * indeed {@code SafeHtml}, use {@code goog.html.SafeHtml.unwrap} instead of
+ * this method. If in doubt, assume that it's security relevant. In particular,
+ * note that goog.html functions which return a goog.html type do not guarantee
+ * that the returned instance is of the right type. For example:
+ *
+ * <pre>
+ * var fakeSafeHtml = new String('fake');
+ * fakeSafeHtml.__proto__ = goog.html.SafeHtml.prototype;
+ * var newSafeHtml = goog.html.SafeHtml.htmlEscape(fakeSafeHtml);
+ * // newSafeHtml is just an alias for fakeSafeHtml, it's passed through by
+ * // goog.html.SafeHtml.htmlEscape() as fakeSafeHtml
+ * // instanceof goog.html.SafeHtml.
+ * </pre>
+ *
+ * @see goog.html.SafeHtml#unwrap
+ * @override
+ */
+goog.html.SafeHtml.prototype.getTypedStringValue = function() {
+  return this.privateDoNotAccessOrElseSafeHtmlWrappedValue_;
+};
+
+
+if (goog.DEBUG) {
+  /**
+   * Returns a debug string-representation of this value.
+   *
+   * To obtain the actual string value wrapped in a SafeHtml, use
+   * {@code goog.html.SafeHtml.unwrap}.
+   *
+   * @see goog.html.SafeHtml#unwrap
+   * @override
+   */
+  goog.html.SafeHtml.prototype.toString = function() {
+    return 'SafeHtml{' + this.privateDoNotAccessOrElseSafeHtmlWrappedValue_ +
+        '}';
+  };
+}
+
+
+/**
+ * Performs a runtime check that the provided object is indeed a SafeHtml
+ * object, and returns its value.
+ * @param {!goog.html.SafeHtml} safeHtml The object to extract from.
+ * @return {string} The SafeHtml object's contained string, unless the run-time
+ *     type check fails. In that case, {@code unwrap} returns an innocuous
+ *     string, or, if assertions are enabled, throws
+ *     {@code goog.asserts.AssertionError}.
+ */
+goog.html.SafeHtml.unwrap = function(safeHtml) {
+  // Perform additional run-time type-checking to ensure that safeHtml is indeed
+  // an instance of the expected type.  This provides some additional protection
+  // against security bugs due to application code that disables type checks.
+  // Specifically, the following checks are performed:
+  // 1. The object is an instance of the expected type.
+  // 2. The object is not an instance of a subclass.
+  // 3. The object carries a type marker for the expected type. "Faking" an
+  // object requires a reference to the type marker, which has names intended
+  // to stand out in code reviews.
+  if (safeHtml instanceof goog.html.SafeHtml &&
+      safeHtml.constructor === goog.html.SafeHtml &&
+      safeHtml.SAFE_HTML_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ ===
+          goog.html.SafeHtml.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_) {
+    return safeHtml.privateDoNotAccessOrElseSafeHtmlWrappedValue_;
+  } else {
+    goog.asserts.fail('expected object of type SafeHtml, got \'' +
+                      safeHtml + '\'');
+    return 'type_error:SafeHtml';
+  }
+};
+
+
+/**
+ * Shorthand for union of types that can sensibly be converted to strings
+ * or might already be SafeHtml (as SafeHtml is a goog.string.TypedString).
+ * @private
+ * @typedef {string|number|boolean|!goog.string.TypedString|
+ *           !goog.i18n.bidi.DirectionalString}
+ */
+goog.html.SafeHtml.TextOrHtml_;
+
+
+/**
+ * Returns HTML-escaped text as a SafeHtml object.
+ *
+ * If text is of a type that implements
+ * {@code goog.i18n.bidi.DirectionalString}, the directionality of the new
+ * {@code SafeHtml} object is set to {@code text}'s directionality, if known.
+ * Otherwise, the directionality of the resulting SafeHtml is unknown (i.e.,
+ * {@code null}).
+ *
+ * @param {!goog.html.SafeHtml.TextOrHtml_} textOrHtml The text to escape. If
+ *     the parameter is of type SafeHtml it is returned directly (no escaping
+ *     is done).
+ * @return {!goog.html.SafeHtml} The escaped text, wrapped as a SafeHtml.
+ */
+goog.html.SafeHtml.htmlEscape = function(textOrHtml) {
+  if (textOrHtml instanceof goog.html.SafeHtml) {
+    return textOrHtml;
+  }
+  var dir = null;
+  if (textOrHtml.implementsGoogI18nBidiDirectionalString) {
+    dir = textOrHtml.getDirection();
+  }
+  var textAsString;
+  if (textOrHtml.implementsGoogStringTypedString) {
+    textAsString = textOrHtml.getTypedStringValue();
+  } else {
+    textAsString = String(textOrHtml);
+  }
+  return goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse(
+      goog.string.htmlEscape(textAsString), dir);
+};
+
+
+/**
+ * Returns HTML-escaped text as a SafeHtml object, with newlines changed to
+ * &lt;br&gt;.
+ * @param {!goog.html.SafeHtml.TextOrHtml_} textOrHtml The text to escape. If
+ *     the parameter is of type SafeHtml it is returned directly (no escaping
+ *     is done).
+ * @return {!goog.html.SafeHtml} The escaped text, wrapped as a SafeHtml.
+ */
+goog.html.SafeHtml.htmlEscapePreservingNewlines = function(textOrHtml) {
+  if (textOrHtml instanceof goog.html.SafeHtml) {
+    return textOrHtml;
+  }
+  var html = goog.html.SafeHtml.htmlEscape(textOrHtml);
+  return goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse(
+      goog.string.newLineToBr(goog.html.SafeHtml.unwrap(html)),
+      html.getDirection());
+};
+
+
+/**
+ * Returns HTML-escaped text as a SafeHtml object, with newlines changed to
+ * &lt;br&gt; and escaping whitespace to preserve spatial formatting. Character
+ * entity #160 is used to make it safer for XML.
+ * @param {!goog.html.SafeHtml.TextOrHtml_} textOrHtml The text to escape. If
+ *     the parameter is of type SafeHtml it is returned directly (no escaping
+ *     is done).
+ * @return {!goog.html.SafeHtml} The escaped text, wrapped as a SafeHtml.
+ */
+goog.html.SafeHtml.htmlEscapePreservingNewlinesAndSpaces = function(
+    textOrHtml) {
+  if (textOrHtml instanceof goog.html.SafeHtml) {
+    return textOrHtml;
+  }
+  var html = goog.html.SafeHtml.htmlEscape(textOrHtml);
+  return goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse(
+      goog.string.whitespaceEscape(goog.html.SafeHtml.unwrap(html)),
+      html.getDirection());
+};
+
+
+/**
+ * Coerces an arbitrary object into a SafeHtml object.
+ *
+ * If {@code textOrHtml} is already of type {@code goog.html.SafeHtml}, the same
+ * object is returned. Otherwise, {@code textOrHtml} is coerced to string, and
+ * HTML-escaped. If {@code textOrHtml} is of a type that implements
+ * {@code goog.i18n.bidi.DirectionalString}, its directionality, if known, is
+ * preserved.
+ *
+ * @param {!goog.html.SafeHtml.TextOrHtml_} textOrHtml The text or SafeHtml to
+ *     coerce.
+ * @return {!goog.html.SafeHtml} The resulting SafeHtml object.
+ * @deprecated Use goog.html.SafeHtml.htmlEscape.
+ */
+goog.html.SafeHtml.from = goog.html.SafeHtml.htmlEscape;
+
+
+/**
+ * @const
+ * @private
+ */
+goog.html.SafeHtml.VALID_NAMES_IN_TAG_ = /^[a-zA-Z0-9-]+$/;
+
+
+/**
+ * Set of attributes containing URL as defined at
+ * http://www.w3.org/TR/html5/index.html#attributes-1.
+ * @private @const {!Object<string,boolean>}
+ */
+goog.html.SafeHtml.URL_ATTRIBUTES_ = goog.object.createSet('action', 'cite',
+    'data', 'formaction', 'href', 'manifest', 'poster', 'src');
+
+
+/**
+ * Tags which are unsupported via create(). They might be supported via a
+ * tag-specific create method. These are tags which might require a
+ * TrustedResourceUrl in one of their attributes or a restricted type for
+ * their content.
+ * @private @const {!Object<string,boolean>}
+ */
+goog.html.SafeHtml.NOT_ALLOWED_TAG_NAMES_ = goog.object.createSet(
+    goog.dom.TagName.EMBED, goog.dom.TagName.IFRAME, goog.dom.TagName.LINK,
+    goog.dom.TagName.OBJECT, goog.dom.TagName.SCRIPT, goog.dom.TagName.STYLE,
+    goog.dom.TagName.TEMPLATE);
+
+
+/**
+ * @typedef {string|number|goog.string.TypedString|
+ *     goog.html.SafeStyle.PropertyMap}
+ * @private
+ */
+goog.html.SafeHtml.AttributeValue_;
+
+
+/**
+ * Creates a SafeHtml content consisting of a tag with optional attributes and
+ * optional content.
+ *
+ * For convenience tag names and attribute names are accepted as regular
+ * strings, instead of goog.string.Const. Nevertheless, you should not pass
+ * user-controlled values to these parameters. Note that these parameters are
+ * syntactically validated at runtime, and invalid values will result in
+ * an exception.
+ *
+ * Example usage:
+ *
+ * goog.html.SafeHtml.create('br');
+ * goog.html.SafeHtml.create('div', {'class': 'a'});
+ * goog.html.SafeHtml.create('p', {}, 'a');
+ * goog.html.SafeHtml.create('p', {}, goog.html.SafeHtml.create('br'));
+ *
+ * goog.html.SafeHtml.create('span', {
+ *   'style': {'margin': '0'}
+ * });
+ *
+ * To guarantee SafeHtml's type contract is upheld there are restrictions on
+ * attribute values and tag names.
+ *
+ * - For attributes which contain script code (on*), a goog.string.Const is
+ *   required.
+ * - For attributes which contain style (style), a goog.html.SafeStyle or a
+ *   goog.html.SafeStyle.PropertyMap is required.
+ * - For attributes which are interpreted as URLs (e.g. src, href) a
+ *   goog.html.SafeUrl, goog.string.Const or string is required. If a string
+ *   is passed, it will be sanitized with SafeUrl.sanitize().
+ * - For tags which can load code, more specific goog.html.SafeHtml.create*()
+ *   functions must be used. Tags which can load code and are not supported by
+ *   this function are embed, iframe, link, object, script, style, and template.
+ *
+ * @param {string} tagName The name of the tag. Only tag names consisting of
+ *     [a-zA-Z0-9-] are allowed. Tag names documented above are disallowed.
+ * @param {!Object<string, goog.html.SafeHtml.AttributeValue_>=}
+ *     opt_attributes Mapping from attribute names to their values. Only
+ *     attribute names consisting of [a-zA-Z0-9-] are allowed. Value of null or
+ *     undefined causes the attribute to be omitted.
+ * @param {!goog.html.SafeHtml.TextOrHtml_|
+ *     !Array<!goog.html.SafeHtml.TextOrHtml_>=} opt_content Content to
+ *     HTML-escape and put inside the tag. This must be empty for void tags
+ *     like <br>. Array elements are concatenated.
+ * @return {!goog.html.SafeHtml} The SafeHtml content with the tag.
+ * @throws {Error} If invalid tag name, attribute name, or attribute value is
+ *     provided.
+ * @throws {goog.asserts.AssertionError} If content for void tag is provided.
+ */
+goog.html.SafeHtml.create = function(tagName, opt_attributes, opt_content) {
+  if (!goog.html.SafeHtml.VALID_NAMES_IN_TAG_.test(tagName)) {
+    throw Error('Invalid tag name <' + tagName + '>.');
+  }
+  if (tagName.toUpperCase() in goog.html.SafeHtml.NOT_ALLOWED_TAG_NAMES_) {
+    throw Error('Tag name <' + tagName + '> is not allowed for SafeHtml.');
+  }
+  return goog.html.SafeHtml.createSafeHtmlTagSecurityPrivateDoNotAccessOrElse(
+      tagName, opt_attributes, opt_content);
+};
+
+
+/**
+ * Creates a SafeHtml representing an iframe tag.
+ *
+ * By default the sandbox attribute is set to an empty value, which is the most
+ * secure option, as it confers the iframe the least privileges. If this
+ * is too restrictive then granting individual privileges is the preferable
+ * option. Unsetting the attribute entirely is the least secure option and
+ * should never be done unless it's stricly necessary.
+ *
+ * @param {goog.html.TrustedResourceUrl=} opt_src The value of the src
+ *     attribute. If null or undefined src will not be set.
+ * @param {goog.html.SafeHtml=} opt_srcdoc The value of the srcdoc attribute.
+ *     If null or undefined srcdoc will not be set.
+ * @param {!Object<string, goog.html.SafeHtml.AttributeValue_>=}
+ *     opt_attributes Mapping from attribute names to their values. Only
+ *     attribute names consisting of [a-zA-Z0-9-] are allowed. Value of null or
+ *     undefined causes the attribute to be omitted.
+ * @param {!goog.html.SafeHtml.TextOrHtml_|
+ *     !Array<!goog.html.SafeHtml.TextOrHtml_>=} opt_content Content to
+ *     HTML-escape and put inside the tag. Array elements are concatenated.
+ * @return {!goog.html.SafeHtml} The SafeHtml content with the tag.
+ * @throws {Error} If invalid tag name, attribute name, or attribute value is
+ *     provided. If opt_attributes contains the src or srcdoc attributes.
+ */
+goog.html.SafeHtml.createIframe = function(
+    opt_src, opt_srcdoc, opt_attributes, opt_content) {
+  var fixedAttributes = {};
+  fixedAttributes['src'] = opt_src || null;
+  fixedAttributes['srcdoc'] = opt_srcdoc || null;
+  var defaultAttributes = {'sandbox': ''};
+  var attributes = goog.html.SafeHtml.combineAttributes(
+      fixedAttributes, defaultAttributes, opt_attributes);
+  return goog.html.SafeHtml.createSafeHtmlTagSecurityPrivateDoNotAccessOrElse(
+      'iframe', attributes, opt_content);
+};
+
+
+/**
+ * Creates a SafeHtml representing a style tag. The type attribute is set
+ * to "text/css".
+ * @param {!goog.html.SafeStyleSheet|!Array<!goog.html.SafeStyleSheet>}
+ *     styleSheet Content to put inside the tag. Array elements are
+ *     concatenated.
+ * @param {!Object<string, goog.html.SafeHtml.AttributeValue_>=}
+ *     opt_attributes Mapping from attribute names to their values. Only
+ *     attribute names consisting of [a-zA-Z0-9-] are allowed. Value of null or
+ *     undefined causes the attribute to be omitted.
+ * @return {!goog.html.SafeHtml} The SafeHtml content with the tag.
+ * @throws {Error} If invalid attribute name or attribute value is provided. If
+ *     opt_attributes contains the type attribute.
+ */
+goog.html.SafeHtml.createStyle = function(styleSheet, opt_attributes) {
+  var fixedAttributes = {'type': 'text/css'};
+  var defaultAttributes = {};
+  var attributes = goog.html.SafeHtml.combineAttributes(
+      fixedAttributes, defaultAttributes, opt_attributes);
+
+  var content = '';
+  styleSheet = goog.array.concat(styleSheet);
+  for (var i = 0; i < styleSheet.length; i++) {
+    content += goog.html.SafeStyleSheet.unwrap(styleSheet[i]);
+  }
+  // Convert to SafeHtml so that it's not HTML-escaped.
+  var htmlContent = goog.html.SafeHtml
+      .createSafeHtmlSecurityPrivateDoNotAccessOrElse(
+          content, goog.i18n.bidi.Dir.NEUTRAL);
+  return goog.html.SafeHtml.createSafeHtmlTagSecurityPrivateDoNotAccessOrElse(
+      'style', attributes, htmlContent);
+};
+
+
+/**
+ * @param {string} tagName The tag name.
+ * @param {string} name The attribute name.
+ * @param {!goog.html.SafeHtml.AttributeValue_} value The attribute value.
+ * @return {string} A "name=value" string.
+ * @throws {Error} If attribute value is unsafe for the given tag and attribute.
+ * @private
+ */
+goog.html.SafeHtml.getAttrNameAndValue_ = function(tagName, name, value) {
+  // If it's goog.string.Const, allow any valid attribute name.
+  if (value instanceof goog.string.Const) {
+    value = goog.string.Const.unwrap(value);
+  } else if (name.toLowerCase() == 'style') {
+    value = goog.html.SafeHtml.getStyleValue_(value);
+  } else if (/^on/i.test(name)) {
+    // TODO(jakubvrana): Disallow more attributes with a special meaning.
+    throw Error('Attribute "' + name +
+        '" requires goog.string.Const value, "' + value + '" given.');
+  // URL attributes handled differently accroding to tag.
+  } else if (name.toLowerCase() in goog.html.SafeHtml.URL_ATTRIBUTES_) {
+    if (value instanceof goog.html.TrustedResourceUrl) {
+      value = goog.html.TrustedResourceUrl.unwrap(value);
+    } else if (value instanceof goog.html.SafeUrl) {
+      value = goog.html.SafeUrl.unwrap(value);
+    } else if (goog.isString(value)) {
+      value = goog.html.SafeUrl.sanitize(value).getTypedStringValue();
+    } else {
+      throw Error('Attribute "' + name + '" on tag "' + tagName +
+          '" requires goog.html.SafeUrl, goog.string.Const, or string,' +
+          ' value "' + value + '" given.');
+    }
+  }
+
+  // Accept SafeUrl, TrustedResourceUrl, etc. for attributes which only require
+  // HTML-escaping.
+  if (value.implementsGoogStringTypedString) {
+    // Ok to call getTypedStringValue() since there's no reliance on the type
+    // contract for security here.
+    value = value.getTypedStringValue();
+  }
+
+  goog.asserts.assert(goog.isString(value) || goog.isNumber(value),
+      'String or number value expected, got ' +
+      (typeof value) + ' with value: ' + value);
+  return name + '="' + goog.string.htmlEscape(String(value)) + '"';
+};
+
+
+/**
+ * Gets value allowed in "style" attribute.
+ * @param {goog.html.SafeHtml.AttributeValue_} value It could be SafeStyle or a
+ *     map which will be passed to goog.html.SafeStyle.create.
+ * @return {string} Unwrapped value.
+ * @throws {Error} If string value is given.
+ * @private
+ */
+goog.html.SafeHtml.getStyleValue_ = function(value) {
+  if (!goog.isObject(value)) {
+    throw Error('The "style" attribute requires goog.html.SafeStyle or map ' +
+        'of style properties, ' + (typeof value) + ' given: ' + value);
+  }
+  if (!(value instanceof goog.html.SafeStyle)) {
+    // Process the property bag into a style object.
+    value = goog.html.SafeStyle.create(value);
+  }
+  return goog.html.SafeStyle.unwrap(value);
+};
+
+
+/**
+ * Creates a SafeHtml content with known directionality consisting of a tag with
+ * optional attributes and optional content.
+ * @param {!goog.i18n.bidi.Dir} dir Directionality.
+ * @param {string} tagName
+ * @param {!Object<string, goog.html.SafeHtml.AttributeValue_>=} opt_attributes
+ * @param {!goog.html.SafeHtml.TextOrHtml_|
+ *     !Array<!goog.html.SafeHtml.TextOrHtml_>=} opt_content
+ * @return {!goog.html.SafeHtml} The SafeHtml content with the tag.
+ */
+goog.html.SafeHtml.createWithDir = function(dir, tagName, opt_attributes,
+    opt_content) {
+  var html = goog.html.SafeHtml.create(tagName, opt_attributes, opt_content);
+  html.dir_ = dir;
+  return html;
+};
+
+
+/**
+ * Creates a new SafeHtml object by concatenating values.
+ * @param {...(!goog.html.SafeHtml.TextOrHtml_|
+ *     !Array<!goog.html.SafeHtml.TextOrHtml_>)} var_args Values to concatenate.
+ * @return {!goog.html.SafeHtml}
+ */
+goog.html.SafeHtml.concat = function(var_args) {
+  var dir = goog.i18n.bidi.Dir.NEUTRAL;
+  var content = '';
+
+  /**
+   * @param {!goog.html.SafeHtml.TextOrHtml_|
+   *     !Array<!goog.html.SafeHtml.TextOrHtml_>} argument
+   */
+  var addArgument = function(argument) {
+    if (goog.isArray(argument)) {
+      goog.array.forEach(argument, addArgument);
+    } else {
+      var html = goog.html.SafeHtml.htmlEscape(argument);
+      content += goog.html.SafeHtml.unwrap(html);
+      var htmlDir = html.getDirection();
+      if (dir == goog.i18n.bidi.Dir.NEUTRAL) {
+        dir = htmlDir;
+      } else if (htmlDir != goog.i18n.bidi.Dir.NEUTRAL && dir != htmlDir) {
+        dir = null;
+      }
+    }
+  };
+
+  goog.array.forEach(arguments, addArgument);
+  return goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse(
+      content, dir);
+};
+
+
+/**
+ * Creates a new SafeHtml object with known directionality by concatenating the
+ * values.
+ * @param {!goog.i18n.bidi.Dir} dir Directionality.
+ * @param {...(!goog.html.SafeHtml.TextOrHtml_|
+ *     !Array<!goog.html.SafeHtml.TextOrHtml_>)} var_args Elements of array
+ *     arguments would be processed recursively.
+ * @return {!goog.html.SafeHtml}
+ */
+goog.html.SafeHtml.concatWithDir = function(dir, var_args) {
+  var html = goog.html.SafeHtml.concat(goog.array.slice(arguments, 1));
+  html.dir_ = dir;
+  return html;
+};
+
+
+/**
+ * Type marker for the SafeHtml type, used to implement additional run-time
+ * type checking.
+ * @const {!Object}
+ * @private
+ */
+goog.html.SafeHtml.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ = {};
+
+
+/**
+ * Package-internal utility method to create SafeHtml instances.
+ *
+ * @param {string} html The string to initialize the SafeHtml object with.
+ * @param {?goog.i18n.bidi.Dir} dir The directionality of the SafeHtml to be
+ *     constructed, or null if unknown.
+ * @return {!goog.html.SafeHtml} The initialized SafeHtml object.
+ * @package
+ */
+goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse = function(
+    html, dir) {
+  return new goog.html.SafeHtml().initSecurityPrivateDoNotAccessOrElse_(
+      html, dir);
+};
+
+
+/**
+ * Called from createSafeHtmlSecurityPrivateDoNotAccessOrElse(). This
+ * method exists only so that the compiler can dead code eliminate static
+ * fields (like EMPTY) when they're not accessed.
+ * @param {string} html
+ * @param {?goog.i18n.bidi.Dir} dir
+ * @return {!goog.html.SafeHtml}
+ * @private
+ */
+goog.html.SafeHtml.prototype.initSecurityPrivateDoNotAccessOrElse_ = function(
+    html, dir) {
+  this.privateDoNotAccessOrElseSafeHtmlWrappedValue_ = html;
+  this.dir_ = dir;
+  return this;
+};
+
+
+/**
+ * Like create() but does not restrict which tags can be constructed.
+ *
+ * @param {string} tagName Tag name. Set or validated by caller.
+ * @param {!Object<string, goog.html.SafeHtml.AttributeValue_>=} opt_attributes
+ * @param {(!goog.html.SafeHtml.TextOrHtml_|
+ *     !Array<!goog.html.SafeHtml.TextOrHtml_>)=} opt_content
+ * @return {!goog.html.SafeHtml}
+ * @throws {Error} If invalid or unsafe attribute name or value is provided.
+ * @throws {goog.asserts.AssertionError} If content for void tag is provided.
+ * @package
+ */
+goog.html.SafeHtml.createSafeHtmlTagSecurityPrivateDoNotAccessOrElse =
+    function(tagName, opt_attributes, opt_content) {
+  var dir = null;
+  var result = '<' + tagName;
+
+  if (opt_attributes) {
+    for (var name in opt_attributes) {
+      if (!goog.html.SafeHtml.VALID_NAMES_IN_TAG_.test(name)) {
+        throw Error('Invalid attribute name "' + name + '".');
+      }
+      var value = opt_attributes[name];
+      if (!goog.isDefAndNotNull(value)) {
+        continue;
+      }
+      result += ' ' +
+          goog.html.SafeHtml.getAttrNameAndValue_(tagName, name, value);
+    }
+  }
+
+  var content = opt_content;
+  if (!goog.isDefAndNotNull(content)) {
+    content = [];
+  } else if (!goog.isArray(content)) {
+    content = [content];
+  }
+
+  if (goog.dom.tags.isVoidTag(tagName.toLowerCase())) {
+    goog.asserts.assert(!content.length,
+        'Void tag <' + tagName + '> does not allow content.');
+    result += '>';
+  } else {
+    var html = goog.html.SafeHtml.concat(content);
+    result += '>' + goog.html.SafeHtml.unwrap(html) + '</' + tagName + '>';
+    dir = html.getDirection();
+  }
+
+  var dirAttribute = opt_attributes && opt_attributes['dir'];
+  if (dirAttribute) {
+    if (/^(ltr|rtl|auto)$/i.test(dirAttribute)) {
+      // If the tag has the "dir" attribute specified then its direction is
+      // neutral because it can be safely used in any context.
+      dir = goog.i18n.bidi.Dir.NEUTRAL;
+    } else {
+      dir = null;
+    }
+  }
+
+  return goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse(
+      result, dir);
+};
+
+
+/**
+ * @param {!Object<string, string>} fixedAttributes
+ * @param {!Object<string, string>} defaultAttributes
+ * @param {!Object<string, goog.html.SafeHtml.AttributeValue_>=}
+ *     opt_attributes Optional attributes passed to create*().
+ * @return {!Object<string, goog.html.SafeHtml.AttributeValue_>}
+ * @throws {Error} If opt_attributes contains an attribute with the same name
+ *     as an attribute in fixedAttributes.
+ * @package
+ */
+goog.html.SafeHtml.combineAttributes = function(
+    fixedAttributes, defaultAttributes, opt_attributes) {
+  var combinedAttributes = {};
+  var name;
+
+  for (name in fixedAttributes) {
+    goog.asserts.assert(name.toLowerCase() == name, 'Must be lower case');
+    combinedAttributes[name] = fixedAttributes[name];
+  }
+  for (name in defaultAttributes) {
+    goog.asserts.assert(name.toLowerCase() == name, 'Must be lower case');
+    combinedAttributes[name] = defaultAttributes[name];
+  }
+
+  for (name in opt_attributes) {
+    var nameLower = name.toLowerCase();
+    if (nameLower in fixedAttributes) {
+      throw Error('Cannot override "' + nameLower + '" attribute, got "' +
+          name + '" with value "' + opt_attributes[name] + '"');
+    }
+    if (nameLower in defaultAttributes) {
+      delete combinedAttributes[nameLower];
+    }
+    combinedAttributes[name] = opt_attributes[name];
+  }
+
+  return combinedAttributes;
+};
+
+
+/**
+ * A SafeHtml instance corresponding to the HTML doctype: "<!DOCTYPE html>".
+ * @const {!goog.html.SafeHtml}
+ */
+goog.html.SafeHtml.DOCTYPE_HTML =
+    goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse(
+        '<!DOCTYPE html>', goog.i18n.bidi.Dir.NEUTRAL);
+
+
+/**
+ * A SafeHtml instance corresponding to the empty string.
+ * @const {!goog.html.SafeHtml}
+ */
+goog.html.SafeHtml.EMPTY =
+    goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse(
+        '', goog.i18n.bidi.Dir.NEUTRAL);
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Type-safe wrappers for unsafe DOM APIs.
+ *
+ * This file provides type-safe wrappers for DOM APIs that can result in
+ * cross-site scripting (XSS) vulnerabilities, if the API is supplied with
+ * untrusted (attacker-controlled) input.  Instead of plain strings, the type
+ * safe wrappers consume values of types from the goog.html package whose
+ * contract promises that values are safe to use in the corresponding context.
+ *
+ * Hence, a program that exclusively uses the wrappers in this file (i.e., whose
+ * only reference to security-sensitive raw DOM APIs are in this file) is
+ * guaranteed to be free of XSS due to incorrect use of such DOM APIs (modulo
+ * correctness of code that produces values of the respective goog.html types,
+ * and absent code that violates type safety).
+ *
+ * For example, assigning to an element's .innerHTML property a string that is
+ * derived (even partially) from untrusted input typically results in an XSS
+ * vulnerability. The type-safe wrapper goog.html.setInnerHtml consumes a value
+ * of type goog.html.SafeHtml, whose contract states that using its values in a
+ * HTML context will not result in XSS. Hence a program that is free of direct
+ * assignments to any element's innerHTML property (with the exception of the
+ * assignment to .innerHTML in this file) is guaranteed to be free of XSS due to
+ * assignment of untrusted strings to the innerHTML property.
+ */
+
+goog.provide('goog.dom.safe');
+goog.provide('goog.dom.safe.InsertAdjacentHtmlPosition');
+
+goog.require('goog.asserts');
+goog.require('goog.html.SafeHtml');
+goog.require('goog.html.SafeUrl');
+goog.require('goog.html.TrustedResourceUrl');
+goog.require('goog.string');
+goog.require('goog.string.Const');
+
+
+/** @enum {string} */
+goog.dom.safe.InsertAdjacentHtmlPosition = {
+  AFTERBEGIN: 'afterbegin',
+  AFTEREND: 'afterend',
+  BEFOREBEGIN: 'beforebegin',
+  BEFOREEND: 'beforeend'
+};
+
+
+/**
+ * Inserts known-safe HTML into a Node, at the specified position.
+ * @param {!Node} node The node on which to call insertAdjacentHTML.
+ * @param {!goog.dom.safe.InsertAdjacentHtmlPosition} position Position where
+ *     to insert the HTML.
+ * @param {!goog.html.SafeHtml} html The known-safe HTML to insert.
+ */
+goog.dom.safe.insertAdjacentHtml = function(node, position, html) {
+  node.insertAdjacentHTML(position, goog.html.SafeHtml.unwrap(html));
+};
+
+
+/**
+ * Assigns known-safe HTML to an element's innerHTML property.
+ * @param {!Element} elem The element whose innerHTML is to be assigned to.
+ * @param {!goog.html.SafeHtml} html The known-safe HTML to assign.
+ */
+goog.dom.safe.setInnerHtml = function(elem, html) {
+  elem.innerHTML = goog.html.SafeHtml.unwrap(html);
+};
+
+
+/**
+ * Assigns known-safe HTML to an element's outerHTML property.
+ * @param {!Element} elem The element whose outerHTML is to be assigned to.
+ * @param {!goog.html.SafeHtml} html The known-safe HTML to assign.
+ */
+goog.dom.safe.setOuterHtml = function(elem, html) {
+  elem.outerHTML = goog.html.SafeHtml.unwrap(html);
+};
+
+
+/**
+ * Writes known-safe HTML to a document.
+ * @param {!Document} doc The document to be written to.
+ * @param {!goog.html.SafeHtml} html The known-safe HTML to assign.
+ */
+goog.dom.safe.documentWrite = function(doc, html) {
+  doc.write(goog.html.SafeHtml.unwrap(html));
+};
+
+
+/**
+ * Safely assigns a URL to an anchor element's href property.
+ *
+ * If url is of type goog.html.SafeUrl, its value is unwrapped and assigned to
+ * anchor's href property.  If url is of type string however, it is first
+ * sanitized using goog.html.SafeUrl.sanitize.
+ *
+ * Example usage:
+ *   goog.dom.safe.setAnchorHref(anchorEl, url);
+ * which is a safe alternative to
+ *   anchorEl.href = url;
+ * The latter can result in XSS vulnerabilities if url is a
+ * user-/attacker-controlled value.
+ *
+ * @param {!HTMLAnchorElement} anchor The anchor element whose href property
+ *     is to be assigned to.
+ * @param {string|!goog.html.SafeUrl} url The URL to assign.
+ * @see goog.html.SafeUrl#sanitize
+ */
+goog.dom.safe.setAnchorHref = function(anchor, url) {
+  /** @type {!goog.html.SafeUrl} */
+  var safeUrl;
+  if (url instanceof goog.html.SafeUrl) {
+    safeUrl = url;
+  } else {
+    safeUrl = goog.html.SafeUrl.sanitize(url);
+  }
+  anchor.href = goog.html.SafeUrl.unwrap(safeUrl);
+};
+
+
+/**
+ * Safely assigns a URL to an embed element's src property.
+ *
+ * Example usage:
+ *   goog.dom.safe.setEmbedSrc(embedEl, url);
+ * which is a safe alternative to
+ *   embedEl.src = url;
+ * The latter can result in loading untrusted code unless it is ensured that
+ * the URL refers to a trustworthy resource.
+ *
+ * @param {!HTMLEmbedElement} embed The embed element whose src property
+ *     is to be assigned to.
+ * @param {!goog.html.TrustedResourceUrl} url The URL to assign.
+ */
+goog.dom.safe.setEmbedSrc = function(embed, url) {
+  embed.src = goog.html.TrustedResourceUrl.unwrap(url);
+};
+
+
+/**
+ * Safely assigns a URL to a frame element's src property.
+ *
+ * Example usage:
+ *   goog.dom.safe.setFrameSrc(frameEl, url);
+ * which is a safe alternative to
+ *   frameEl.src = url;
+ * The latter can result in loading untrusted code unless it is ensured that
+ * the URL refers to a trustworthy resource.
+ *
+ * @param {!HTMLFrameElement} frame The frame element whose src property
+ *     is to be assigned to.
+ * @param {!goog.html.TrustedResourceUrl} url The URL to assign.
+ */
+goog.dom.safe.setFrameSrc = function(frame, url) {
+  frame.src = goog.html.TrustedResourceUrl.unwrap(url);
+};
+
+
+/**
+ * Safely assigns a URL to an iframe element's src property.
+ *
+ * Example usage:
+ *   goog.dom.safe.setIframeSrc(iframeEl, url);
+ * which is a safe alternative to
+ *   iframeEl.src = url;
+ * The latter can result in loading untrusted code unless it is ensured that
+ * the URL refers to a trustworthy resource.
+ *
+ * @param {!HTMLIFrameElement} iframe The iframe element whose src property
+ *     is to be assigned to.
+ * @param {!goog.html.TrustedResourceUrl} url The URL to assign.
+ */
+goog.dom.safe.setIframeSrc = function(iframe, url) {
+  iframe.src = goog.html.TrustedResourceUrl.unwrap(url);
+};
+
+
+/**
+ * Safely sets a link element's href and rel properties. Whether or not
+ * the URL assigned to href has to be a goog.html.TrustedResourceUrl
+ * depends on the value of the rel property. If rel contains "stylesheet"
+ * then a TrustedResourceUrl is required.
+ *
+ * Example usage:
+ *   goog.dom.safe.setLinkHrefAndRel(linkEl, url, 'stylesheet');
+ * which is a safe alternative to
+ *   linkEl.rel = 'stylesheet';
+ *   linkEl.href = url;
+ * The latter can result in loading untrusted code unless it is ensured that
+ * the URL refers to a trustworthy resource.
+ *
+ * @param {!HTMLLinkElement} link The link element whose href property
+ *     is to be assigned to.
+ * @param {string|!goog.html.SafeUrl|!goog.html.TrustedResourceUrl} url The URL
+ *     to assign to the href property. Must be a TrustedResourceUrl if the
+ *     value assigned to rel contains "stylesheet". A string value is
+ *     sanitized with goog.html.SafeUrl.sanitize.
+ * @param {string} rel The value to assign to the rel property.
+ * @throws {Error} if rel contains "stylesheet" and url is not a
+ *     TrustedResourceUrl
+ * @see goog.html.SafeUrl#sanitize
+ */
+goog.dom.safe.setLinkHrefAndRel = function(link, url, rel) {
+  link.rel = rel;
+  if (goog.string.caseInsensitiveContains(rel, 'stylesheet')) {
+    goog.asserts.assert(
+        url instanceof goog.html.TrustedResourceUrl,
+        'URL must be TrustedResourceUrl because "rel" contains "stylesheet"');
+    link.href = goog.html.TrustedResourceUrl.unwrap(url);
+  } else if (url instanceof goog.html.TrustedResourceUrl) {
+    link.href = goog.html.TrustedResourceUrl.unwrap(url);
+  } else if (url instanceof goog.html.SafeUrl) {
+    link.href = goog.html.SafeUrl.unwrap(url);
+  } else {  // string
+    // SafeUrl.sanitize must return legitimate SafeUrl when passed a string.
+    link.href = goog.html.SafeUrl.sanitize(url).getTypedStringValue();
+  }
+};
+
+
+/**
+ * Safely assigns a URL to an object element's data property.
+ *
+ * Example usage:
+ *   goog.dom.safe.setObjectData(objectEl, url);
+ * which is a safe alternative to
+ *   objectEl.data = url;
+ * The latter can result in loading untrusted code unless setit is ensured that
+ * the URL refers to a trustworthy resource.
+ *
+ * @param {!HTMLObjectElement} object The object element whose data property
+ *     is to be assigned to.
+ * @param {!goog.html.TrustedResourceUrl} url The URL to assign.
+ */
+goog.dom.safe.setObjectData = function(object, url) {
+  object.data = goog.html.TrustedResourceUrl.unwrap(url);
+};
+
+
+/**
+ * Safely assigns a URL to an iframe element's src property.
+ *
+ * Example usage:
+ *   goog.dom.safe.setScriptSrc(scriptEl, url);
+ * which is a safe alternative to
+ *   scriptEl.src = url;
+ * The latter can result in loading untrusted code unless it is ensured that
+ * the URL refers to a trustworthy resource.
+ *
+ * @param {!HTMLScriptElement} script The script element whose src property
+ *     is to be assigned to.
+ * @param {!goog.html.TrustedResourceUrl} url The URL to assign.
+ */
+goog.dom.safe.setScriptSrc = function(script, url) {
+  script.src = goog.html.TrustedResourceUrl.unwrap(url);
+};
+
+
+/**
+ * Safely assigns a URL to a Location object's href property.
+ *
+ * If url is of type goog.html.SafeUrl, its value is unwrapped and assigned to
+ * loc's href property.  If url is of type string however, it is first sanitized
+ * using goog.html.SafeUrl.sanitize.
+ *
+ * Example usage:
+ *   goog.dom.safe.setLocationHref(document.location, redirectUrl);
+ * which is a safe alternative to
+ *   document.location.href = redirectUrl;
+ * The latter can result in XSS vulnerabilities if redirectUrl is a
+ * user-/attacker-controlled value.
+ *
+ * @param {!Location} loc The Location object whose href property is to be
+ *     assigned to.
+ * @param {string|!goog.html.SafeUrl} url The URL to assign.
+ * @see goog.html.SafeUrl#sanitize
+ */
+goog.dom.safe.setLocationHref = function(loc, url) {
+  /** @type {!goog.html.SafeUrl} */
+  var safeUrl;
+  if (url instanceof goog.html.SafeUrl) {
+    safeUrl = url;
+  } else {
+    safeUrl = goog.html.SafeUrl.sanitize(url);
+  }
+  loc.href = goog.html.SafeUrl.unwrap(safeUrl);
+};
+
+
+/**
+ * Safely opens a URL in a new window (via window.open).
+ *
+ * If url is of type goog.html.SafeUrl, its value is unwrapped and passed in to
+ * window.open.  If url is of type string however, it is first sanitized
+ * using goog.html.SafeUrl.sanitize.
+ *
+ * Note that this function does not prevent leakages via the referer that is
+ * sent by window.open. It is advised to only use this to open 1st party URLs.
+ *
+ * Example usage:
+ *   goog.dom.safe.openInWindow(url);
+ * which is a safe alternative to
+ *   window.open(url);
+ * The latter can result in XSS vulnerabilities if redirectUrl is a
+ * user-/attacker-controlled value.
+ *
+ * @param {string|!goog.html.SafeUrl} url The URL to open.
+ * @param {Window=} opt_openerWin Window of which to call the .open() method.
+ *     Defaults to the global window.
+ * @param {!goog.string.Const=} opt_name Name of the window to open in. Can be
+ *     _top, etc as allowed by window.open().
+ * @param {string=} opt_specs Comma-separated list of specifications, same as
+ *     in window.open().
+ * @param {boolean=} opt_replace Whether to replace the current entry in browser
+ *     history, same as in window.open().
+ * @return {Window} Window the url was opened in.
+ */
+goog.dom.safe.openInWindow = function(
+    url, opt_openerWin, opt_name, opt_specs, opt_replace) {
+  /** @type {!goog.html.SafeUrl} */
+  var safeUrl;
+  if (url instanceof goog.html.SafeUrl) {
+    safeUrl = url;
+  } else {
+    safeUrl = goog.html.SafeUrl.sanitize(url);
+  }
+  var win = opt_openerWin || window;
+  return win.open(goog.html.SafeUrl.unwrap(safeUrl),
+      // If opt_name is undefined, simply passing that in to open() causes IE to
+      // reuse the current window instead of opening a new one. Thus we pass ''
+      // in instead, which according to spec opens a new window. See
+      // https://html.spec.whatwg.org/multipage/browsers.html#dom-open .
+      opt_name ? goog.string.Const.unwrap(opt_name) : '',
+      opt_specs, opt_replace);
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview A utility class for representing two-dimensional positions.
+ */
+
+
+goog.provide('goog.math.Coordinate');
+
+goog.require('goog.math');
+
+
+
+/**
+ * Class for representing coordinates and positions.
+ * @param {number=} opt_x Left, defaults to 0.
+ * @param {number=} opt_y Top, defaults to 0.
+ * @struct
+ * @constructor
+ */
+goog.math.Coordinate = function(opt_x, opt_y) {
+  /**
+   * X-value
+   * @type {number}
+   */
+  this.x = goog.isDef(opt_x) ? opt_x : 0;
+
+  /**
+   * Y-value
+   * @type {number}
+   */
+  this.y = goog.isDef(opt_y) ? opt_y : 0;
+};
+
+
+/**
+ * Returns a new copy of the coordinate.
+ * @return {!goog.math.Coordinate} A clone of this coordinate.
+ */
+goog.math.Coordinate.prototype.clone = function() {
+  return new goog.math.Coordinate(this.x, this.y);
+};
+
+
+if (goog.DEBUG) {
+  /**
+   * Returns a nice string representing the coordinate.
+   * @return {string} In the form (50, 73).
+   * @override
+   */
+  goog.math.Coordinate.prototype.toString = function() {
+    return '(' + this.x + ', ' + this.y + ')';
+  };
+}
+
+
+/**
+ * Compares coordinates for equality.
+ * @param {goog.math.Coordinate} a A Coordinate.
+ * @param {goog.math.Coordinate} b A Coordinate.
+ * @return {boolean} True iff the coordinates are equal, or if both are null.
+ */
+goog.math.Coordinate.equals = function(a, b) {
+  if (a == b) {
+    return true;
+  }
+  if (!a || !b) {
+    return false;
+  }
+  return a.x == b.x && a.y == b.y;
+};
+
+
+/**
+ * Returns the distance between two coordinates.
+ * @param {!goog.math.Coordinate} a A Coordinate.
+ * @param {!goog.math.Coordinate} b A Coordinate.
+ * @return {number} The distance between {@code a} and {@code b}.
+ */
+goog.math.Coordinate.distance = function(a, b) {
+  var dx = a.x - b.x;
+  var dy = a.y - b.y;
+  return Math.sqrt(dx * dx + dy * dy);
+};
+
+
+/**
+ * Returns the magnitude of a coordinate.
+ * @param {!goog.math.Coordinate} a A Coordinate.
+ * @return {number} The distance between the origin and {@code a}.
+ */
+goog.math.Coordinate.magnitude = function(a) {
+  return Math.sqrt(a.x * a.x + a.y * a.y);
+};
+
+
+/**
+ * Returns the angle from the origin to a coordinate.
+ * @param {!goog.math.Coordinate} a A Coordinate.
+ * @return {number} The angle, in degrees, clockwise from the positive X
+ *     axis to {@code a}.
+ */
+goog.math.Coordinate.azimuth = function(a) {
+  return goog.math.angle(0, 0, a.x, a.y);
+};
+
+
+/**
+ * Returns the squared distance between two coordinates. Squared distances can
+ * be used for comparisons when the actual value is not required.
+ *
+ * Performance note: eliminating the square root is an optimization often used
+ * in lower-level languages, but the speed difference is not nearly as
+ * pronounced in JavaScript (only a few percent.)
+ *
+ * @param {!goog.math.Coordinate} a A Coordinate.
+ * @param {!goog.math.Coordinate} b A Coordinate.
+ * @return {number} The squared distance between {@code a} and {@code b}.
+ */
+goog.math.Coordinate.squaredDistance = function(a, b) {
+  var dx = a.x - b.x;
+  var dy = a.y - b.y;
+  return dx * dx + dy * dy;
+};
+
+
+/**
+ * Returns the difference between two coordinates as a new
+ * goog.math.Coordinate.
+ * @param {!goog.math.Coordinate} a A Coordinate.
+ * @param {!goog.math.Coordinate} b A Coordinate.
+ * @return {!goog.math.Coordinate} A Coordinate representing the difference
+ *     between {@code a} and {@code b}.
+ */
+goog.math.Coordinate.difference = function(a, b) {
+  return new goog.math.Coordinate(a.x - b.x, a.y - b.y);
+};
+
+
+/**
+ * Returns the sum of two coordinates as a new goog.math.Coordinate.
+ * @param {!goog.math.Coordinate} a A Coordinate.
+ * @param {!goog.math.Coordinate} b A Coordinate.
+ * @return {!goog.math.Coordinate} A Coordinate representing the sum of the two
+ *     coordinates.
+ */
+goog.math.Coordinate.sum = function(a, b) {
+  return new goog.math.Coordinate(a.x + b.x, a.y + b.y);
+};
+
+
+/**
+ * Rounds the x and y fields to the next larger integer values.
+ * @return {!goog.math.Coordinate} This coordinate with ceil'd fields.
+ */
+goog.math.Coordinate.prototype.ceil = function() {
+  this.x = Math.ceil(this.x);
+  this.y = Math.ceil(this.y);
+  return this;
+};
+
+
+/**
+ * Rounds the x and y fields to the next smaller integer values.
+ * @return {!goog.math.Coordinate} This coordinate with floored fields.
+ */
+goog.math.Coordinate.prototype.floor = function() {
+  this.x = Math.floor(this.x);
+  this.y = Math.floor(this.y);
+  return this;
+};
+
+
+/**
+ * Rounds the x and y fields to the nearest integer values.
+ * @return {!goog.math.Coordinate} This coordinate with rounded fields.
+ */
+goog.math.Coordinate.prototype.round = function() {
+  this.x = Math.round(this.x);
+  this.y = Math.round(this.y);
+  return this;
+};
+
+
+/**
+ * Translates this box by the given offsets. If a {@code goog.math.Coordinate}
+ * is given, then the x and y values are translated by the coordinate's x and y.
+ * Otherwise, x and y are translated by {@code tx} and {@code opt_ty}
+ * respectively.
+ * @param {number|goog.math.Coordinate} tx The value to translate x by or the
+ *     the coordinate to translate this coordinate by.
+ * @param {number=} opt_ty The value to translate y by.
+ * @return {!goog.math.Coordinate} This coordinate after translating.
+ */
+goog.math.Coordinate.prototype.translate = function(tx, opt_ty) {
+  if (tx instanceof goog.math.Coordinate) {
+    this.x += tx.x;
+    this.y += tx.y;
+  } else {
+    this.x += tx;
+    if (goog.isNumber(opt_ty)) {
+      this.y += opt_ty;
+    }
+  }
+  return this;
+};
+
+
+/**
+ * Scales this coordinate by the given scale factors. The x and y values are
+ * scaled by {@code sx} and {@code opt_sy} respectively.  If {@code opt_sy}
+ * is not given, then {@code sx} is used for both x and y.
+ * @param {number} sx The scale factor to use for the x dimension.
+ * @param {number=} opt_sy The scale factor to use for the y dimension.
+ * @return {!goog.math.Coordinate} This coordinate after scaling.
+ */
+goog.math.Coordinate.prototype.scale = function(sx, opt_sy) {
+  var sy = goog.isNumber(opt_sy) ? opt_sy : sx;
+  this.x *= sx;
+  this.y *= sy;
+  return this;
+};
+
+
+/**
+ * Rotates this coordinate clockwise about the origin (or, optionally, the given
+ * center) by the given angle, in radians.
+ * @param {number} radians The angle by which to rotate this coordinate
+ *     clockwise about the given center, in radians.
+ * @param {!goog.math.Coordinate=} opt_center The center of rotation. Defaults
+ *     to (0, 0) if not given.
+ */
+goog.math.Coordinate.prototype.rotateRadians = function(radians, opt_center) {
+  var center = opt_center || new goog.math.Coordinate(0, 0);
+
+  var x = this.x;
+  var y = this.y;
+  var cos = Math.cos(radians);
+  var sin = Math.sin(radians);
+
+  this.x = (x - center.x) * cos - (y - center.y) * sin + center.x;
+  this.y = (x - center.x) * sin + (y - center.y) * cos + center.y;
+};
+
+
+/**
+ * Rotates this coordinate clockwise about the origin (or, optionally, the given
+ * center) by the given angle, in degrees.
+ * @param {number} degrees The angle by which to rotate this coordinate
+ *     clockwise about the given center, in degrees.
+ * @param {!goog.math.Coordinate=} opt_center The center of rotation. Defaults
+ *     to (0, 0) if not given.
+ */
+goog.math.Coordinate.prototype.rotateDegrees = function(degrees, opt_center) {
+  this.rotateRadians(goog.math.toRadians(degrees), opt_center);
+};
+
+// Copyright 2007 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview A utility class for representing two-dimensional sizes.
+ * @author brenneman@google.com (Shawn Brenneman)
+ */
+
+
+goog.provide('goog.math.Size');
+
+
+
+/**
+ * Class for representing sizes consisting of a width and height. Undefined
+ * width and height support is deprecated and results in compiler warning.
+ * @param {number} width Width.
+ * @param {number} height Height.
+ * @struct
+ * @constructor
+ */
+goog.math.Size = function(width, height) {
+  /**
+   * Width
+   * @type {number}
+   */
+  this.width = width;
+
+  /**
+   * Height
+   * @type {number}
+   */
+  this.height = height;
+};
+
+
+/**
+ * Compares sizes for equality.
+ * @param {goog.math.Size} a A Size.
+ * @param {goog.math.Size} b A Size.
+ * @return {boolean} True iff the sizes have equal widths and equal
+ *     heights, or if both are null.
+ */
+goog.math.Size.equals = function(a, b) {
+  if (a == b) {
+    return true;
+  }
+  if (!a || !b) {
+    return false;
+  }
+  return a.width == b.width && a.height == b.height;
+};
+
+
+/**
+ * @return {!goog.math.Size} A new copy of the Size.
+ */
+goog.math.Size.prototype.clone = function() {
+  return new goog.math.Size(this.width, this.height);
+};
+
+
+if (goog.DEBUG) {
+  /**
+   * Returns a nice string representing size.
+   * @return {string} In the form (50 x 73).
+   * @override
+   */
+  goog.math.Size.prototype.toString = function() {
+    return '(' + this.width + ' x ' + this.height + ')';
+  };
+}
+
+
+/**
+ * @return {number} The longer of the two dimensions in the size.
+ */
+goog.math.Size.prototype.getLongest = function() {
+  return Math.max(this.width, this.height);
+};
+
+
+/**
+ * @return {number} The shorter of the two dimensions in the size.
+ */
+goog.math.Size.prototype.getShortest = function() {
+  return Math.min(this.width, this.height);
+};
+
+
+/**
+ * @return {number} The area of the size (width * height).
+ */
+goog.math.Size.prototype.area = function() {
+  return this.width * this.height;
+};
+
+
+/**
+ * @return {number} The perimeter of the size (width + height) * 2.
+ */
+goog.math.Size.prototype.perimeter = function() {
+  return (this.width + this.height) * 2;
+};
+
+
+/**
+ * @return {number} The ratio of the size's width to its height.
+ */
+goog.math.Size.prototype.aspectRatio = function() {
+  return this.width / this.height;
+};
+
+
+/**
+ * @return {boolean} True if the size has zero area, false if both dimensions
+ *     are non-zero numbers.
+ */
+goog.math.Size.prototype.isEmpty = function() {
+  return !this.area();
+};
+
+
+/**
+ * Clamps the width and height parameters upward to integer values.
+ * @return {!goog.math.Size} This size with ceil'd components.
+ */
+goog.math.Size.prototype.ceil = function() {
+  this.width = Math.ceil(this.width);
+  this.height = Math.ceil(this.height);
+  return this;
+};
+
+
+/**
+ * @param {!goog.math.Size} target The target size.
+ * @return {boolean} True if this Size is the same size or smaller than the
+ *     target size in both dimensions.
+ */
+goog.math.Size.prototype.fitsInside = function(target) {
+  return this.width <= target.width && this.height <= target.height;
+};
+
+
+/**
+ * Clamps the width and height parameters downward to integer values.
+ * @return {!goog.math.Size} This size with floored components.
+ */
+goog.math.Size.prototype.floor = function() {
+  this.width = Math.floor(this.width);
+  this.height = Math.floor(this.height);
+  return this;
+};
+
+
+/**
+ * Rounds the width and height parameters to integer values.
+ * @return {!goog.math.Size} This size with rounded components.
+ */
+goog.math.Size.prototype.round = function() {
+  this.width = Math.round(this.width);
+  this.height = Math.round(this.height);
+  return this;
+};
+
+
+/**
+ * Scales this size by the given scale factors. The width and height are scaled
+ * by {@code sx} and {@code opt_sy} respectively.  If {@code opt_sy} is not
+ * given, then {@code sx} is used for both the width and height.
+ * @param {number} sx The scale factor to use for the width.
+ * @param {number=} opt_sy The scale factor to use for the height.
+ * @return {!goog.math.Size} This Size object after scaling.
+ */
+goog.math.Size.prototype.scale = function(sx, opt_sy) {
+  var sy = goog.isNumber(opt_sy) ? opt_sy : sx;
+  this.width *= sx;
+  this.height *= sy;
+  return this;
+};
+
+
+/**
+ * Uniformly scales the size to perfectly cover the dimensions of a given size.
+ * If the size is already larger than the target, it will be scaled down to the
+ * minimum size at which it still covers the entire target. The original aspect
+ * ratio will be preserved.
+ *
+ * This function assumes that both Sizes contain strictly positive dimensions.
+ * @param {!goog.math.Size} target The target size.
+ * @return {!goog.math.Size} This Size object, after optional scaling.
+ */
+goog.math.Size.prototype.scaleToCover = function(target) {
+  var s = this.aspectRatio() <= target.aspectRatio() ?
+      target.width / this.width :
+      target.height / this.height;
+
+  return this.scale(s);
+};
+
+
+/**
+ * Uniformly scales the size to fit inside the dimensions of a given size. The
+ * original aspect ratio will be preserved.
+ *
+ * This function assumes that both Sizes contain strictly positive dimensions.
+ * @param {!goog.math.Size} target The target size.
+ * @return {!goog.math.Size} This Size object, after optional scaling.
+ */
+goog.math.Size.prototype.scaleToFit = function(target) {
+  var s = this.aspectRatio() > target.aspectRatio() ?
+      target.width / this.width :
+      target.height / this.height;
+
+  return this.scale(s);
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Utilities for manipulating the browser's Document Object Model
+ * Inspiration taken *heavily* from mochikit (http://mochikit.com/).
+ *
+ * You can use {@link goog.dom.DomHelper} to create new dom helpers that refer
+ * to a different document object.  This is useful if you are working with
+ * frames or multiple windows.
+ *
+ * @author arv@google.com (Erik Arvidsson)
+ */
+
+
+// TODO(arv): Rename/refactor getTextContent and getRawTextContent. The problem
+// is that getTextContent should mimic the DOM3 textContent. We should add a
+// getInnerText (or getText) which tries to return the visible text, innerText.
+
+
+goog.provide('goog.dom');
+goog.provide('goog.dom.Appendable');
+goog.provide('goog.dom.DomHelper');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.dom.BrowserFeature');
+goog.require('goog.dom.NodeType');
+goog.require('goog.dom.TagName');
+goog.require('goog.dom.safe');
+goog.require('goog.html.SafeHtml');
+goog.require('goog.math.Coordinate');
+goog.require('goog.math.Size');
+goog.require('goog.object');
+goog.require('goog.string');
+goog.require('goog.string.Unicode');
+goog.require('goog.userAgent');
+
+
+/**
+ * @define {boolean} Whether we know at compile time that the browser is in
+ * quirks mode.
+ */
+goog.define('goog.dom.ASSUME_QUIRKS_MODE', false);
+
+
+/**
+ * @define {boolean} Whether we know at compile time that the browser is in
+ * standards compliance mode.
+ */
+goog.define('goog.dom.ASSUME_STANDARDS_MODE', false);
+
+
+/**
+ * Whether we know the compatibility mode at compile time.
+ * @type {boolean}
+ * @private
+ */
+goog.dom.COMPAT_MODE_KNOWN_ =
+    goog.dom.ASSUME_QUIRKS_MODE || goog.dom.ASSUME_STANDARDS_MODE;
+
+
+/**
+ * Gets the DomHelper object for the document where the element resides.
+ * @param {(Node|Window)=} opt_element If present, gets the DomHelper for this
+ *     element.
+ * @return {!goog.dom.DomHelper} The DomHelper.
+ */
+goog.dom.getDomHelper = function(opt_element) {
+  return opt_element ?
+      new goog.dom.DomHelper(goog.dom.getOwnerDocument(opt_element)) :
+      (goog.dom.defaultDomHelper_ ||
+          (goog.dom.defaultDomHelper_ = new goog.dom.DomHelper()));
+};
+
+
+/**
+ * Cached default DOM helper.
+ * @type {goog.dom.DomHelper}
+ * @private
+ */
+goog.dom.defaultDomHelper_;
+
+
+/**
+ * Gets the document object being used by the dom library.
+ * @return {!Document} Document object.
+ */
+goog.dom.getDocument = function() {
+  return document;
+};
+
+
+/**
+ * Gets an element from the current document by element id.
+ *
+ * If an Element is passed in, it is returned.
+ *
+ * @param {string|Element} element Element ID or a DOM node.
+ * @return {Element} The element with the given ID, or the node passed in.
+ */
+goog.dom.getElement = function(element) {
+  return goog.dom.getElementHelper_(document, element);
+};
+
+
+/**
+ * Gets an element by id from the given document (if present).
+ * If an element is given, it is returned.
+ * @param {!Document} doc
+ * @param {string|Element} element Element ID or a DOM node.
+ * @return {Element} The resulting element.
+ * @private
+ */
+goog.dom.getElementHelper_ = function(doc, element) {
+  return goog.isString(element) ?
+      doc.getElementById(element) :
+      element;
+};
+
+
+/**
+ * Gets an element by id, asserting that the element is found.
+ *
+ * This is used when an element is expected to exist, and should fail with
+ * an assertion error if it does not (if assertions are enabled).
+ *
+ * @param {string} id Element ID.
+ * @return {!Element} The element with the given ID, if it exists.
+ */
+goog.dom.getRequiredElement = function(id) {
+  return goog.dom.getRequiredElementHelper_(document, id);
+};
+
+
+/**
+ * Helper function for getRequiredElementHelper functions, both static and
+ * on DomHelper.  Asserts the element with the given id exists.
+ * @param {!Document} doc
+ * @param {string} id
+ * @return {!Element} The element with the given ID, if it exists.
+ * @private
+ */
+goog.dom.getRequiredElementHelper_ = function(doc, id) {
+  // To prevent users passing in Elements as is permitted in getElement().
+  goog.asserts.assertString(id);
+  var element = goog.dom.getElementHelper_(doc, id);
+  element = goog.asserts.assertElement(element,
+      'No element found with id: ' + id);
+  return element;
+};
+
+
+/**
+ * Alias for getElement.
+ * @param {string|Element} element Element ID or a DOM node.
+ * @return {Element} The element with the given ID, or the node passed in.
+ * @deprecated Use {@link goog.dom.getElement} instead.
+ */
+goog.dom.$ = goog.dom.getElement;
+
+
+/**
+ * Looks up elements by both tag and class name, using browser native functions
+ * ({@code querySelectorAll}, {@code getElementsByTagName} or
+ * {@code getElementsByClassName}) where possible. This function
+ * is a useful, if limited, way of collecting a list of DOM elements
+ * with certain characteristics.  {@code goog.dom.query} offers a
+ * more powerful and general solution which allows matching on CSS3
+ * selector expressions, but at increased cost in code size. If all you
+ * need is particular tags belonging to a single class, this function
+ * is fast and sleek.
+ *
+ * Note that tag names are case sensitive in the SVG namespace, and this
+ * function converts opt_tag to uppercase for comparisons. For queries in the
+ * SVG namespace you should use querySelector or querySelectorAll instead.
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=963870
+ * https://bugs.webkit.org/show_bug.cgi?id=83438
+ *
+ * @see {goog.dom.query}
+ *
+ * @param {?string=} opt_tag Element tag name.
+ * @param {?string=} opt_class Optional class name.
+ * @param {(Document|Element)=} opt_el Optional element to look in.
+ * @return { {length: number} } Array-like list of elements (only a length
+ *     property and numerical indices are guaranteed to exist).
+ */
+goog.dom.getElementsByTagNameAndClass = function(opt_tag, opt_class, opt_el) {
+  return goog.dom.getElementsByTagNameAndClass_(document, opt_tag, opt_class,
+                                                opt_el);
+};
+
+
+/**
+ * Returns a static, array-like list of the elements with the provided
+ * className.
+ * @see {goog.dom.query}
+ * @param {string} className the name of the class to look for.
+ * @param {(Document|Element)=} opt_el Optional element to look in.
+ * @return { {length: number} } The items found with the class name provided.
+ */
+goog.dom.getElementsByClass = function(className, opt_el) {
+  var parent = opt_el || document;
+  if (goog.dom.canUseQuerySelector_(parent)) {
+    return parent.querySelectorAll('.' + className);
+  }
+  return goog.dom.getElementsByTagNameAndClass_(
+      document, '*', className, opt_el);
+};
+
+
+/**
+ * Returns the first element with the provided className.
+ * @see {goog.dom.query}
+ * @param {string} className the name of the class to look for.
+ * @param {Element|Document=} opt_el Optional element to look in.
+ * @return {Element} The first item with the class name provided.
+ */
+goog.dom.getElementByClass = function(className, opt_el) {
+  var parent = opt_el || document;
+  var retVal = null;
+  if (parent.getElementsByClassName) {
+    retVal = parent.getElementsByClassName(className)[0];
+  } else if (goog.dom.canUseQuerySelector_(parent)) {
+    retVal = parent.querySelector('.' + className);
+  } else {
+    retVal = goog.dom.getElementsByTagNameAndClass_(
+        document, '*', className, opt_el)[0];
+  }
+  return retVal || null;
+};
+
+
+/**
+ * Ensures an element with the given className exists, and then returns the
+ * first element with the provided className.
+ * @see {goog.dom.query}
+ * @param {string} className the name of the class to look for.
+ * @param {!Element|!Document=} opt_root Optional element or document to look
+ *     in.
+ * @return {!Element} The first item with the class name provided.
+ * @throws {goog.asserts.AssertionError} Thrown if no element is found.
+ */
+goog.dom.getRequiredElementByClass = function(className, opt_root) {
+  var retValue = goog.dom.getElementByClass(className, opt_root);
+  return goog.asserts.assert(retValue,
+      'No element found with className: ' + className);
+};
+
+
+/**
+ * Prefer the standardized (http://www.w3.org/TR/selectors-api/), native and
+ * fast W3C Selectors API.
+ * @param {!(Element|Document)} parent The parent document object.
+ * @return {boolean} whether or not we can use parent.querySelector* APIs.
+ * @private
+ */
+goog.dom.canUseQuerySelector_ = function(parent) {
+  return !!(parent.querySelectorAll && parent.querySelector);
+};
+
+
+/**
+ * Helper for {@code getElementsByTagNameAndClass}.
+ * @param {!Document} doc The document to get the elements in.
+ * @param {?string=} opt_tag Element tag name.
+ * @param {?string=} opt_class Optional class name.
+ * @param {(Document|Element)=} opt_el Optional element to look in.
+ * @return { {length: number} } Array-like list of elements (only a length
+ *     property and numerical indices are guaranteed to exist).
+ * @private
+ */
+goog.dom.getElementsByTagNameAndClass_ = function(doc, opt_tag, opt_class,
+                                                  opt_el) {
+  var parent = opt_el || doc;
+  var tagName = (opt_tag && opt_tag != '*') ? opt_tag.toUpperCase() : '';
+
+  if (goog.dom.canUseQuerySelector_(parent) &&
+      (tagName || opt_class)) {
+    var query = tagName + (opt_class ? '.' + opt_class : '');
+    return parent.querySelectorAll(query);
+  }
+
+  // Use the native getElementsByClassName if available, under the assumption
+  // that even when the tag name is specified, there will be fewer elements to
+  // filter through when going by class than by tag name
+  if (opt_class && parent.getElementsByClassName) {
+    var els = parent.getElementsByClassName(opt_class);
+
+    if (tagName) {
+      var arrayLike = {};
+      var len = 0;
+
+      // Filter for specific tags if requested.
+      for (var i = 0, el; el = els[i]; i++) {
+        if (tagName == el.nodeName) {
+          arrayLike[len++] = el;
+        }
+      }
+      arrayLike.length = len;
+
+      return arrayLike;
+    } else {
+      return els;
+    }
+  }
+
+  var els = parent.getElementsByTagName(tagName || '*');
+
+  if (opt_class) {
+    var arrayLike = {};
+    var len = 0;
+    for (var i = 0, el; el = els[i]; i++) {
+      var className = el.className;
+      // Check if className has a split function since SVG className does not.
+      if (typeof className.split == 'function' &&
+          goog.array.contains(className.split(/\s+/), opt_class)) {
+        arrayLike[len++] = el;
+      }
+    }
+    arrayLike.length = len;
+    return arrayLike;
+  } else {
+    return els;
+  }
+};
+
+
+/**
+ * Alias for {@code getElementsByTagNameAndClass}.
+ * @param {?string=} opt_tag Element tag name.
+ * @param {?string=} opt_class Optional class name.
+ * @param {Element=} opt_el Optional element to look in.
+ * @return { {length: number} } Array-like list of elements (only a length
+ *     property and numerical indices are guaranteed to exist).
+ * @deprecated Use {@link goog.dom.getElementsByTagNameAndClass} instead.
+ */
+goog.dom.$$ = goog.dom.getElementsByTagNameAndClass;
+
+
+/**
+ * Sets multiple properties on a node.
+ * @param {Element} element DOM node to set properties on.
+ * @param {Object} properties Hash of property:value pairs.
+ */
+goog.dom.setProperties = function(element, properties) {
+  goog.object.forEach(properties, function(val, key) {
+    if (key == 'style') {
+      element.style.cssText = val;
+    } else if (key == 'class') {
+      element.className = val;
+    } else if (key == 'for') {
+      element.htmlFor = val;
+    } else if (goog.dom.DIRECT_ATTRIBUTE_MAP_.hasOwnProperty(key)) {
+      element.setAttribute(goog.dom.DIRECT_ATTRIBUTE_MAP_[key], val);
+    } else if (goog.string.startsWith(key, 'aria-') ||
+        goog.string.startsWith(key, 'data-')) {
+      element.setAttribute(key, val);
+    } else {
+      element[key] = val;
+    }
+  });
+};
+
+
+/**
+ * Map of attributes that should be set using
+ * element.setAttribute(key, val) instead of element[key] = val.  Used
+ * by goog.dom.setProperties.
+ *
+ * @private {!Object<string, string>}
+ * @const
+ */
+goog.dom.DIRECT_ATTRIBUTE_MAP_ = {
+  'cellpadding': 'cellPadding',
+  'cellspacing': 'cellSpacing',
+  'colspan': 'colSpan',
+  'frameborder': 'frameBorder',
+  'height': 'height',
+  'maxlength': 'maxLength',
+  'role': 'role',
+  'rowspan': 'rowSpan',
+  'type': 'type',
+  'usemap': 'useMap',
+  'valign': 'vAlign',
+  'width': 'width'
+};
+
+
+/**
+ * Gets the dimensions of the viewport.
+ *
+ * Gecko Standards mode:
+ * docEl.clientWidth  Width of viewport excluding scrollbar.
+ * win.innerWidth     Width of viewport including scrollbar.
+ * body.clientWidth   Width of body element.
+ *
+ * docEl.clientHeight Height of viewport excluding scrollbar.
+ * win.innerHeight    Height of viewport including scrollbar.
+ * body.clientHeight  Height of document.
+ *
+ * Gecko Backwards compatible mode:
+ * docEl.clientWidth  Width of viewport excluding scrollbar.
+ * win.innerWidth     Width of viewport including scrollbar.
+ * body.clientWidth   Width of viewport excluding scrollbar.
+ *
+ * docEl.clientHeight Height of document.
+ * win.innerHeight    Height of viewport including scrollbar.
+ * body.clientHeight  Height of viewport excluding scrollbar.
+ *
+ * IE6/7 Standards mode:
+ * docEl.clientWidth  Width of viewport excluding scrollbar.
+ * win.innerWidth     Undefined.
+ * body.clientWidth   Width of body element.
+ *
+ * docEl.clientHeight Height of viewport excluding scrollbar.
+ * win.innerHeight    Undefined.
+ * body.clientHeight  Height of document element.
+ *
+ * IE5 + IE6/7 Backwards compatible mode:
+ * docEl.clientWidth  0.
+ * win.innerWidth     Undefined.
+ * body.clientWidth   Width of viewport excluding scrollbar.
+ *
+ * docEl.clientHeight 0.
+ * win.innerHeight    Undefined.
+ * body.clientHeight  Height of viewport excluding scrollbar.
+ *
+ * Opera 9 Standards and backwards compatible mode:
+ * docEl.clientWidth  Width of viewport excluding scrollbar.
+ * win.innerWidth     Width of viewport including scrollbar.
+ * body.clientWidth   Width of viewport excluding scrollbar.
+ *
+ * docEl.clientHeight Height of document.
+ * win.innerHeight    Height of viewport including scrollbar.
+ * body.clientHeight  Height of viewport excluding scrollbar.
+ *
+ * WebKit:
+ * Safari 2
+ * docEl.clientHeight Same as scrollHeight.
+ * docEl.clientWidth  Same as innerWidth.
+ * win.innerWidth     Width of viewport excluding scrollbar.
+ * win.innerHeight    Height of the viewport including scrollbar.
+ * frame.innerHeight  Height of the viewport exluding scrollbar.
+ *
+ * Safari 3 (tested in 522)
+ *
+ * docEl.clientWidth  Width of viewport excluding scrollbar.
+ * docEl.clientHeight Height of viewport excluding scrollbar in strict mode.
+ * body.clientHeight  Height of viewport excluding scrollbar in quirks mode.
+ *
+ * @param {Window=} opt_window Optional window element to test.
+ * @return {!goog.math.Size} Object with values 'width' and 'height'.
+ */
+goog.dom.getViewportSize = function(opt_window) {
+  // TODO(arv): This should not take an argument
+  return goog.dom.getViewportSize_(opt_window || window);
+};
+
+
+/**
+ * Helper for {@code getViewportSize}.
+ * @param {Window} win The window to get the view port size for.
+ * @return {!goog.math.Size} Object with values 'width' and 'height'.
+ * @private
+ */
+goog.dom.getViewportSize_ = function(win) {
+  var doc = win.document;
+  var el = goog.dom.isCss1CompatMode_(doc) ? doc.documentElement : doc.body;
+  return new goog.math.Size(el.clientWidth, el.clientHeight);
+};
+
+
+/**
+ * Calculates the height of the document.
+ *
+ * @return {number} The height of the current document.
+ */
+goog.dom.getDocumentHeight = function() {
+  return goog.dom.getDocumentHeight_(window);
+};
+
+
+/**
+ * Calculates the height of the document of the given window.
+ *
+ * Function code copied from the opensocial gadget api:
+ *   gadgets.window.adjustHeight(opt_height)
+ *
+ * @private
+ * @param {!Window} win The window whose document height to retrieve.
+ * @return {number} The height of the document of the given window.
+ */
+goog.dom.getDocumentHeight_ = function(win) {
+  // NOTE(eae): This method will return the window size rather than the document
+  // size in webkit quirks mode.
+  var doc = win.document;
+  var height = 0;
+
+  if (doc) {
+    // Calculating inner content height is hard and different between
+    // browsers rendering in Strict vs. Quirks mode.  We use a combination of
+    // three properties within document.body and document.documentElement:
+    // - scrollHeight
+    // - offsetHeight
+    // - clientHeight
+    // These values differ significantly between browsers and rendering modes.
+    // But there are patterns.  It just takes a lot of time and persistence
+    // to figure out.
+
+    var body = doc.body;
+    var docEl = /** @type {!HTMLElement} */ (doc.documentElement);
+    if (!(docEl && body)) {
+      return 0;
+    }
+
+    // Get the height of the viewport
+    var vh = goog.dom.getViewportSize_(win).height;
+    if (goog.dom.isCss1CompatMode_(doc) && docEl.scrollHeight) {
+      // In Strict mode:
+      // The inner content height is contained in either:
+      //    document.documentElement.scrollHeight
+      //    document.documentElement.offsetHeight
+      // Based on studying the values output by different browsers,
+      // use the value that's NOT equal to the viewport height found above.
+      height = docEl.scrollHeight != vh ?
+          docEl.scrollHeight : docEl.offsetHeight;
+    } else {
+      // In Quirks mode:
+      // documentElement.clientHeight is equal to documentElement.offsetHeight
+      // except in IE.  In most browsers, document.documentElement can be used
+      // to calculate the inner content height.
+      // However, in other browsers (e.g. IE), document.body must be used
+      // instead.  How do we know which one to use?
+      // If document.documentElement.clientHeight does NOT equal
+      // document.documentElement.offsetHeight, then use document.body.
+      var sh = docEl.scrollHeight;
+      var oh = docEl.offsetHeight;
+      if (docEl.clientHeight != oh) {
+        sh = body.scrollHeight;
+        oh = body.offsetHeight;
+      }
+
+      // Detect whether the inner content height is bigger or smaller
+      // than the bounding box (viewport).  If bigger, take the larger
+      // value.  If smaller, take the smaller value.
+      if (sh > vh) {
+        // Content is larger
+        height = sh > oh ? sh : oh;
+      } else {
+        // Content is smaller
+        height = sh < oh ? sh : oh;
+      }
+    }
+  }
+
+  return height;
+};
+
+
+/**
+ * Gets the page scroll distance as a coordinate object.
+ *
+ * @param {Window=} opt_window Optional window element to test.
+ * @return {!goog.math.Coordinate} Object with values 'x' and 'y'.
+ * @deprecated Use {@link goog.dom.getDocumentScroll} instead.
+ */
+goog.dom.getPageScroll = function(opt_window) {
+  var win = opt_window || goog.global || window;
+  return goog.dom.getDomHelper(win.document).getDocumentScroll();
+};
+
+
+/**
+ * Gets the document scroll distance as a coordinate object.
+ *
+ * @return {!goog.math.Coordinate} Object with values 'x' and 'y'.
+ */
+goog.dom.getDocumentScroll = function() {
+  return goog.dom.getDocumentScroll_(document);
+};
+
+
+/**
+ * Helper for {@code getDocumentScroll}.
+ *
+ * @param {!Document} doc The document to get the scroll for.
+ * @return {!goog.math.Coordinate} Object with values 'x' and 'y'.
+ * @private
+ */
+goog.dom.getDocumentScroll_ = function(doc) {
+  var el = goog.dom.getDocumentScrollElement_(doc);
+  var win = goog.dom.getWindow_(doc);
+  if (goog.userAgent.IE && goog.userAgent.isVersionOrHigher('10') &&
+      win.pageYOffset != el.scrollTop) {
+    // The keyboard on IE10 touch devices shifts the page using the pageYOffset
+    // without modifying scrollTop. For this case, we want the body scroll
+    // offsets.
+    return new goog.math.Coordinate(el.scrollLeft, el.scrollTop);
+  }
+  return new goog.math.Coordinate(win.pageXOffset || el.scrollLeft,
+      win.pageYOffset || el.scrollTop);
+};
+
+
+/**
+ * Gets the document scroll element.
+ * @return {!Element} Scrolling element.
+ */
+goog.dom.getDocumentScrollElement = function() {
+  return goog.dom.getDocumentScrollElement_(document);
+};
+
+
+/**
+ * Helper for {@code getDocumentScrollElement}.
+ * @param {!Document} doc The document to get the scroll element for.
+ * @return {!Element} Scrolling element.
+ * @private
+ */
+goog.dom.getDocumentScrollElement_ = function(doc) {
+  // Old WebKit needs body.scrollLeft in both quirks mode and strict mode. We
+  // also default to the documentElement if the document does not have a body
+  // (e.g. a SVG document).
+  // Uses http://dev.w3.org/csswg/cssom-view/#dom-document-scrollingelement to
+  // avoid trying to guess about browser behavior from the UA string.
+  if (doc.scrollingElement) {
+    return doc.scrollingElement;
+  }
+  if (!goog.userAgent.WEBKIT && goog.dom.isCss1CompatMode_(doc)) {
+    return doc.documentElement;
+  }
+  return doc.body || doc.documentElement;
+};
+
+
+/**
+ * Gets the window object associated with the given document.
+ *
+ * @param {Document=} opt_doc  Document object to get window for.
+ * @return {!Window} The window associated with the given document.
+ */
+goog.dom.getWindow = function(opt_doc) {
+  // TODO(arv): This should not take an argument.
+  return opt_doc ? goog.dom.getWindow_(opt_doc) : window;
+};
+
+
+/**
+ * Helper for {@code getWindow}.
+ *
+ * @param {!Document} doc  Document object to get window for.
+ * @return {!Window} The window associated with the given document.
+ * @private
+ */
+goog.dom.getWindow_ = function(doc) {
+  return doc.parentWindow || doc.defaultView;
+};
+
+
+/**
+ * Returns a dom node with a set of attributes.  This function accepts varargs
+ * for subsequent nodes to be added.  Subsequent nodes will be added to the
+ * first node as childNodes.
+ *
+ * So:
+ * <code>createDom('div', null, createDom('p'), createDom('p'));</code>
+ * would return a div with two child paragraphs
+ *
+ * @param {string} tagName Tag to create.
+ * @param {(Object|Array<string>|string)=} opt_attributes If object, then a map
+ *     of name-value pairs for attributes. If a string, then this is the
+ *     className of the new element. If an array, the elements will be joined
+ *     together as the className of the new element.
+ * @param {...(Object|string|Array|NodeList)} var_args Further DOM nodes or
+ *     strings for text nodes. If one of the var_args is an array or NodeList,
+ *     its elements will be added as childNodes instead.
+ * @return {!Element} Reference to a DOM node.
+ */
+goog.dom.createDom = function(tagName, opt_attributes, var_args) {
+  return goog.dom.createDom_(document, arguments);
+};
+
+
+/**
+ * Helper for {@code createDom}.
+ * @param {!Document} doc The document to create the DOM in.
+ * @param {!Arguments} args Argument object passed from the callers. See
+ *     {@code goog.dom.createDom} for details.
+ * @return {!Element} Reference to a DOM node.
+ * @private
+ */
+goog.dom.createDom_ = function(doc, args) {
+  var tagName = args[0];
+  var attributes = args[1];
+
+  // Internet Explorer is dumb:
+  // name: https://msdn.microsoft.com/en-us/library/ms534184(v=vs.85).aspx
+  // type: https://msdn.microsoft.com/en-us/library/ms534700(v=vs.85).aspx
+  // Also does not allow setting of 'type' attribute on 'input' or 'button'.
+  if (!goog.dom.BrowserFeature.CAN_ADD_NAME_OR_TYPE_ATTRIBUTES && attributes &&
+      (attributes.name || attributes.type)) {
+    var tagNameArr = ['<', tagName];
+    if (attributes.name) {
+      tagNameArr.push(' name="', goog.string.htmlEscape(attributes.name), '"');
+    }
+    if (attributes.type) {
+      tagNameArr.push(' type="', goog.string.htmlEscape(attributes.type), '"');
+
+      // Clone attributes map to remove 'type' without mutating the input.
+      var clone = {};
+      goog.object.extend(clone, attributes);
+
+      // JSCompiler can't see how goog.object.extend added this property,
+      // because it was essentially added by reflection.
+      // So it needs to be quoted.
+      delete clone['type'];
+
+      attributes = clone;
+    }
+    tagNameArr.push('>');
+    tagName = tagNameArr.join('');
+  }
+
+  var element = doc.createElement(tagName);
+
+  if (attributes) {
+    if (goog.isString(attributes)) {
+      element.className = attributes;
+    } else if (goog.isArray(attributes)) {
+      element.className = attributes.join(' ');
+    } else {
+      goog.dom.setProperties(element, attributes);
+    }
+  }
+
+  if (args.length > 2) {
+    goog.dom.append_(doc, element, args, 2);
+  }
+
+  return element;
+};
+
+
+/**
+ * Appends a node with text or other nodes.
+ * @param {!Document} doc The document to create new nodes in.
+ * @param {!Node} parent The node to append nodes to.
+ * @param {!Arguments} args The values to add. See {@code goog.dom.append}.
+ * @param {number} startIndex The index of the array to start from.
+ * @private
+ */
+goog.dom.append_ = function(doc, parent, args, startIndex) {
+  function childHandler(child) {
+    // TODO(user): More coercion, ala MochiKit?
+    if (child) {
+      parent.appendChild(goog.isString(child) ?
+          doc.createTextNode(child) : child);
+    }
+  }
+
+  for (var i = startIndex; i < args.length; i++) {
+    var arg = args[i];
+    // TODO(attila): Fix isArrayLike to return false for a text node.
+    if (goog.isArrayLike(arg) && !goog.dom.isNodeLike(arg)) {
+      // If the argument is a node list, not a real array, use a clone,
+      // because forEach can't be used to mutate a NodeList.
+      goog.array.forEach(goog.dom.isNodeList(arg) ?
+          goog.array.toArray(arg) : arg,
+          childHandler);
+    } else {
+      childHandler(arg);
+    }
+  }
+};
+
+
+/**
+ * Alias for {@code createDom}.
+ * @param {string} tagName Tag to create.
+ * @param {(string|Object)=} opt_attributes If object, then a map of name-value
+ *     pairs for attributes. If a string, then this is the className of the new
+ *     element.
+ * @param {...(Object|string|Array|NodeList)} var_args Further DOM nodes or
+ *     strings for text nodes. If one of the var_args is an array, its
+ *     children will be added as childNodes instead.
+ * @return {!Element} Reference to a DOM node.
+ * @deprecated Use {@link goog.dom.createDom} instead.
+ */
+goog.dom.$dom = goog.dom.createDom;
+
+
+/**
+ * Creates a new element.
+ * @param {string} name Tag name.
+ * @return {!Element} The new element.
+ */
+goog.dom.createElement = function(name) {
+  return document.createElement(name);
+};
+
+
+/**
+ * Creates a new text node.
+ * @param {number|string} content Content.
+ * @return {!Text} The new text node.
+ */
+goog.dom.createTextNode = function(content) {
+  return document.createTextNode(String(content));
+};
+
+
+/**
+ * Create a table.
+ * @param {number} rows The number of rows in the table.  Must be >= 1.
+ * @param {number} columns The number of columns in the table.  Must be >= 1.
+ * @param {boolean=} opt_fillWithNbsp If true, fills table entries with
+ *     {@code goog.string.Unicode.NBSP} characters.
+ * @return {!Element} The created table.
+ */
+goog.dom.createTable = function(rows, columns, opt_fillWithNbsp) {
+  // TODO(user): Return HTMLTableElement, also in prototype function.
+  // Callers need to be updated to e.g. not assign numbers to table.cellSpacing.
+  return goog.dom.createTable_(document, rows, columns, !!opt_fillWithNbsp);
+};
+
+
+/**
+ * Create a table.
+ * @param {!Document} doc Document object to use to create the table.
+ * @param {number} rows The number of rows in the table.  Must be >= 1.
+ * @param {number} columns The number of columns in the table.  Must be >= 1.
+ * @param {boolean} fillWithNbsp If true, fills table entries with
+ *     {@code goog.string.Unicode.NBSP} characters.
+ * @return {!HTMLTableElement} The created table.
+ * @private
+ */
+goog.dom.createTable_ = function(doc, rows, columns, fillWithNbsp) {
+  var table = /** @type {!HTMLTableElement} */
+      (doc.createElement(goog.dom.TagName.TABLE));
+  var tbody = table.appendChild(doc.createElement(goog.dom.TagName.TBODY));
+  for (var i = 0; i < rows; i++) {
+    var tr = doc.createElement(goog.dom.TagName.TR);
+    for (var j = 0; j < columns; j++) {
+      var td = doc.createElement(goog.dom.TagName.TD);
+      // IE <= 9 will create a text node if we set text content to the empty
+      // string, so we avoid doing it unless necessary. This ensures that the
+      // same DOM tree is returned on all browsers.
+      if (fillWithNbsp) {
+        goog.dom.setTextContent(td, goog.string.Unicode.NBSP);
+      }
+      tr.appendChild(td);
+    }
+    tbody.appendChild(tr);
+  }
+  return table;
+};
+
+
+/**
+ * Converts HTML markup into a node.
+ * @param {!goog.html.SafeHtml} html The HTML markup to convert.
+ * @return {!Node} The resulting node.
+ */
+goog.dom.safeHtmlToNode = function(html) {
+  return goog.dom.safeHtmlToNode_(document, html);
+};
+
+
+/**
+ * Helper for {@code safeHtmlToNode}.
+ * @param {!Document} doc The document.
+ * @param {!goog.html.SafeHtml} html The HTML markup to convert.
+ * @return {!Node} The resulting node.
+ * @private
+ */
+goog.dom.safeHtmlToNode_ = function(doc, html) {
+  var tempDiv = doc.createElement(goog.dom.TagName.DIV);
+  if (goog.dom.BrowserFeature.INNER_HTML_NEEDS_SCOPED_ELEMENT) {
+    goog.dom.safe.setInnerHtml(tempDiv,
+        goog.html.SafeHtml.concat(goog.html.SafeHtml.create('br'), html));
+    tempDiv.removeChild(tempDiv.firstChild);
+  } else {
+    goog.dom.safe.setInnerHtml(tempDiv, html);
+  }
+  return goog.dom.childrenToNode_(doc, tempDiv);
+};
+
+
+/**
+ * Converts an HTML string into a document fragment. The string must be
+ * sanitized in order to avoid cross-site scripting. For example
+ * {@code goog.dom.htmlToDocumentFragment('&lt;img src=x onerror=alert(0)&gt;')}
+ * triggers an alert in all browsers, even if the returned document fragment
+ * is thrown away immediately.
+ *
+ * NOTE: This method doesn't work if your htmlString contains elements that
+ * can't be contained in a <div>. For example, <tr>.
+ *
+ * @param {string} htmlString The HTML string to convert.
+ * @return {!Node} The resulting document fragment.
+ */
+goog.dom.htmlToDocumentFragment = function(htmlString) {
+  return goog.dom.htmlToDocumentFragment_(document, htmlString);
+};
+
+
+// TODO(jakubvrana): Merge with {@code safeHtmlToNode_}.
+/**
+ * Helper for {@code htmlToDocumentFragment}.
+ *
+ * @param {!Document} doc The document.
+ * @param {string} htmlString The HTML string to convert.
+ * @return {!Node} The resulting document fragment.
+ * @private
+ */
+goog.dom.htmlToDocumentFragment_ = function(doc, htmlString) {
+  var tempDiv = doc.createElement(goog.dom.TagName.DIV);
+  if (goog.dom.BrowserFeature.INNER_HTML_NEEDS_SCOPED_ELEMENT) {
+    tempDiv.innerHTML = '<br>' + htmlString;
+    tempDiv.removeChild(tempDiv.firstChild);
+  } else {
+    tempDiv.innerHTML = htmlString;
+  }
+  return goog.dom.childrenToNode_(doc, tempDiv);
+};
+
+
+/**
+ * Helper for {@code htmlToDocumentFragment_}.
+ * @param {!Document} doc The document.
+ * @param {!Node} tempDiv The input node.
+ * @return {!Node} The resulting node.
+ * @private
+ */
+goog.dom.childrenToNode_ = function(doc, tempDiv) {
+  if (tempDiv.childNodes.length == 1) {
+    return tempDiv.removeChild(tempDiv.firstChild);
+  } else {
+    var fragment = doc.createDocumentFragment();
+    while (tempDiv.firstChild) {
+      fragment.appendChild(tempDiv.firstChild);
+    }
+    return fragment;
+  }
+};
+
+
+/**
+ * Returns true if the browser is in "CSS1-compatible" (standards-compliant)
+ * mode, false otherwise.
+ * @return {boolean} True if in CSS1-compatible mode.
+ */
+goog.dom.isCss1CompatMode = function() {
+  return goog.dom.isCss1CompatMode_(document);
+};
+
+
+/**
+ * Returns true if the browser is in "CSS1-compatible" (standards-compliant)
+ * mode, false otherwise.
+ * @param {!Document} doc The document to check.
+ * @return {boolean} True if in CSS1-compatible mode.
+ * @private
+ */
+goog.dom.isCss1CompatMode_ = function(doc) {
+  if (goog.dom.COMPAT_MODE_KNOWN_) {
+    return goog.dom.ASSUME_STANDARDS_MODE;
+  }
+
+  return doc.compatMode == 'CSS1Compat';
+};
+
+
+/**
+ * Determines if the given node can contain children, intended to be used for
+ * HTML generation.
+ *
+ * IE natively supports node.canHaveChildren but has inconsistent behavior.
+ * Prior to IE8 the base tag allows children and in IE9 all nodes return true
+ * for canHaveChildren.
+ *
+ * In practice all non-IE browsers allow you to add children to any node, but
+ * the behavior is inconsistent:
+ *
+ * <pre>
+ *   var a = document.createElement(goog.dom.TagName.BR);
+ *   a.appendChild(document.createTextNode('foo'));
+ *   a.appendChild(document.createTextNode('bar'));
+ *   console.log(a.childNodes.length);  // 2
+ *   console.log(a.innerHTML);  // Chrome: "", IE9: "foobar", FF3.5: "foobar"
+ * </pre>
+ *
+ * For more information, see:
+ * http://dev.w3.org/html5/markup/syntax.html#syntax-elements
+ *
+ * TODO(user): Rename shouldAllowChildren() ?
+ *
+ * @param {Node} node The node to check.
+ * @return {boolean} Whether the node can contain children.
+ */
+goog.dom.canHaveChildren = function(node) {
+  if (node.nodeType != goog.dom.NodeType.ELEMENT) {
+    return false;
+  }
+  switch (/** @type {!Element} */ (node).tagName) {
+    case goog.dom.TagName.APPLET:
+    case goog.dom.TagName.AREA:
+    case goog.dom.TagName.BASE:
+    case goog.dom.TagName.BR:
+    case goog.dom.TagName.COL:
+    case goog.dom.TagName.COMMAND:
+    case goog.dom.TagName.EMBED:
+    case goog.dom.TagName.FRAME:
+    case goog.dom.TagName.HR:
+    case goog.dom.TagName.IMG:
+    case goog.dom.TagName.INPUT:
+    case goog.dom.TagName.IFRAME:
+    case goog.dom.TagName.ISINDEX:
+    case goog.dom.TagName.KEYGEN:
+    case goog.dom.TagName.LINK:
+    case goog.dom.TagName.NOFRAMES:
+    case goog.dom.TagName.NOSCRIPT:
+    case goog.dom.TagName.META:
+    case goog.dom.TagName.OBJECT:
+    case goog.dom.TagName.PARAM:
+    case goog.dom.TagName.SCRIPT:
+    case goog.dom.TagName.SOURCE:
+    case goog.dom.TagName.STYLE:
+    case goog.dom.TagName.TRACK:
+    case goog.dom.TagName.WBR:
+      return false;
+  }
+  return true;
+};
+
+
+/**
+ * Appends a child to a node.
+ * @param {Node} parent Parent.
+ * @param {Node} child Child.
+ */
+goog.dom.appendChild = function(parent, child) {
+  parent.appendChild(child);
+};
+
+
+/**
+ * Appends a node with text or other nodes.
+ * @param {!Node} parent The node to append nodes to.
+ * @param {...goog.dom.Appendable} var_args The things to append to the node.
+ *     If this is a Node it is appended as is.
+ *     If this is a string then a text node is appended.
+ *     If this is an array like object then fields 0 to length - 1 are appended.
+ */
+goog.dom.append = function(parent, var_args) {
+  goog.dom.append_(goog.dom.getOwnerDocument(parent), parent, arguments, 1);
+};
+
+
+/**
+ * Removes all the child nodes on a DOM node.
+ * @param {Node} node Node to remove children from.
+ */
+goog.dom.removeChildren = function(node) {
+  // Note: Iterations over live collections can be slow, this is the fastest
+  // we could find. The double parenthesis are used to prevent JsCompiler and
+  // strict warnings.
+  var child;
+  while ((child = node.firstChild)) {
+    node.removeChild(child);
+  }
+};
+
+
+/**
+ * Inserts a new node before an existing reference node (i.e. as the previous
+ * sibling). If the reference node has no parent, then does nothing.
+ * @param {Node} newNode Node to insert.
+ * @param {Node} refNode Reference node to insert before.
+ */
+goog.dom.insertSiblingBefore = function(newNode, refNode) {
+  if (refNode.parentNode) {
+    refNode.parentNode.insertBefore(newNode, refNode);
+  }
+};
+
+
+/**
+ * Inserts a new node after an existing reference node (i.e. as the next
+ * sibling). If the reference node has no parent, then does nothing.
+ * @param {Node} newNode Node to insert.
+ * @param {Node} refNode Reference node to insert after.
+ */
+goog.dom.insertSiblingAfter = function(newNode, refNode) {
+  if (refNode.parentNode) {
+    refNode.parentNode.insertBefore(newNode, refNode.nextSibling);
+  }
+};
+
+
+/**
+ * Insert a child at a given index. If index is larger than the number of child
+ * nodes that the parent currently has, the node is inserted as the last child
+ * node.
+ * @param {Element} parent The element into which to insert the child.
+ * @param {Node} child The element to insert.
+ * @param {number} index The index at which to insert the new child node. Must
+ *     not be negative.
+ */
+goog.dom.insertChildAt = function(parent, child, index) {
+  // Note that if the second argument is null, insertBefore
+  // will append the child at the end of the list of children.
+  parent.insertBefore(child, parent.childNodes[index] || null);
+};
+
+
+/**
+ * Removes a node from its parent.
+ * @param {Node} node The node to remove.
+ * @return {Node} The node removed if removed; else, null.
+ */
+goog.dom.removeNode = function(node) {
+  return node && node.parentNode ? node.parentNode.removeChild(node) : null;
+};
+
+
+/**
+ * Replaces a node in the DOM tree. Will do nothing if {@code oldNode} has no
+ * parent.
+ * @param {Node} newNode Node to insert.
+ * @param {Node} oldNode Node to replace.
+ */
+goog.dom.replaceNode = function(newNode, oldNode) {
+  var parent = oldNode.parentNode;
+  if (parent) {
+    parent.replaceChild(newNode, oldNode);
+  }
+};
+
+
+/**
+ * Flattens an element. That is, removes it and replace it with its children.
+ * Does nothing if the element is not in the document.
+ * @param {Element} element The element to flatten.
+ * @return {Element|undefined} The original element, detached from the document
+ *     tree, sans children; or undefined, if the element was not in the document
+ *     to begin with.
+ */
+goog.dom.flattenElement = function(element) {
+  var child, parent = element.parentNode;
+  if (parent && parent.nodeType != goog.dom.NodeType.DOCUMENT_FRAGMENT) {
+    // Use IE DOM method (supported by Opera too) if available
+    if (element.removeNode) {
+      return /** @type {Element} */ (element.removeNode(false));
+    } else {
+      // Move all children of the original node up one level.
+      while ((child = element.firstChild)) {
+        parent.insertBefore(child, element);
+      }
+
+      // Detach the original element.
+      return /** @type {Element} */ (goog.dom.removeNode(element));
+    }
+  }
+};
+
+
+/**
+ * Returns an array containing just the element children of the given element.
+ * @param {Element} element The element whose element children we want.
+ * @return {!(Array|NodeList)} An array or array-like list of just the element
+ *     children of the given element.
+ */
+goog.dom.getChildren = function(element) {
+  // We check if the children attribute is supported for child elements
+  // since IE8 misuses the attribute by also including comments.
+  if (goog.dom.BrowserFeature.CAN_USE_CHILDREN_ATTRIBUTE &&
+      element.children != undefined) {
+    return element.children;
+  }
+  // Fall back to manually filtering the element's child nodes.
+  return goog.array.filter(element.childNodes, function(node) {
+    return node.nodeType == goog.dom.NodeType.ELEMENT;
+  });
+};
+
+
+/**
+ * Returns the first child node that is an element.
+ * @param {Node} node The node to get the first child element of.
+ * @return {Element} The first child node of {@code node} that is an element.
+ */
+goog.dom.getFirstElementChild = function(node) {
+  if (goog.isDef(node.firstElementChild)) {
+    return /** @type {!Element} */(node).firstElementChild;
+  }
+  return goog.dom.getNextElementNode_(node.firstChild, true);
+};
+
+
+/**
+ * Returns the last child node that is an element.
+ * @param {Node} node The node to get the last child element of.
+ * @return {Element} The last child node of {@code node} that is an element.
+ */
+goog.dom.getLastElementChild = function(node) {
+  if (goog.isDef(node.lastElementChild)) {
+    return /** @type {!Element} */(node).lastElementChild;
+  }
+  return goog.dom.getNextElementNode_(node.lastChild, false);
+};
+
+
+/**
+ * Returns the first next sibling that is an element.
+ * @param {Node} node The node to get the next sibling element of.
+ * @return {Element} The next sibling of {@code node} that is an element.
+ */
+goog.dom.getNextElementSibling = function(node) {
+  if (goog.isDef(node.nextElementSibling)) {
+    return /** @type {!Element} */(node).nextElementSibling;
+  }
+  return goog.dom.getNextElementNode_(node.nextSibling, true);
+};
+
+
+/**
+ * Returns the first previous sibling that is an element.
+ * @param {Node} node The node to get the previous sibling element of.
+ * @return {Element} The first previous sibling of {@code node} that is
+ *     an element.
+ */
+goog.dom.getPreviousElementSibling = function(node) {
+  if (goog.isDef(node.previousElementSibling)) {
+    return /** @type {!Element} */(node).previousElementSibling;
+  }
+  return goog.dom.getNextElementNode_(node.previousSibling, false);
+};
+
+
+/**
+ * Returns the first node that is an element in the specified direction,
+ * starting with {@code node}.
+ * @param {Node} node The node to get the next element from.
+ * @param {boolean} forward Whether to look forwards or backwards.
+ * @return {Element} The first element.
+ * @private
+ */
+goog.dom.getNextElementNode_ = function(node, forward) {
+  while (node && node.nodeType != goog.dom.NodeType.ELEMENT) {
+    node = forward ? node.nextSibling : node.previousSibling;
+  }
+
+  return /** @type {Element} */ (node);
+};
+
+
+/**
+ * Returns the next node in source order from the given node.
+ * @param {Node} node The node.
+ * @return {Node} The next node in the DOM tree, or null if this was the last
+ *     node.
+ */
+goog.dom.getNextNode = function(node) {
+  if (!node) {
+    return null;
+  }
+
+  if (node.firstChild) {
+    return node.firstChild;
+  }
+
+  while (node && !node.nextSibling) {
+    node = node.parentNode;
+  }
+
+  return node ? node.nextSibling : null;
+};
+
+
+/**
+ * Returns the previous node in source order from the given node.
+ * @param {Node} node The node.
+ * @return {Node} The previous node in the DOM tree, or null if this was the
+ *     first node.
+ */
+goog.dom.getPreviousNode = function(node) {
+  if (!node) {
+    return null;
+  }
+
+  if (!node.previousSibling) {
+    return node.parentNode;
+  }
+
+  node = node.previousSibling;
+  while (node && node.lastChild) {
+    node = node.lastChild;
+  }
+
+  return node;
+};
+
+
+/**
+ * Whether the object looks like a DOM node.
+ * @param {?} obj The object being tested for node likeness.
+ * @return {boolean} Whether the object looks like a DOM node.
+ */
+goog.dom.isNodeLike = function(obj) {
+  return goog.isObject(obj) && obj.nodeType > 0;
+};
+
+
+/**
+ * Whether the object looks like an Element.
+ * @param {?} obj The object being tested for Element likeness.
+ * @return {boolean} Whether the object looks like an Element.
+ */
+goog.dom.isElement = function(obj) {
+  return goog.isObject(obj) && obj.nodeType == goog.dom.NodeType.ELEMENT;
+};
+
+
+/**
+ * Returns true if the specified value is a Window object. This includes the
+ * global window for HTML pages, and iframe windows.
+ * @param {?} obj Variable to test.
+ * @return {boolean} Whether the variable is a window.
+ */
+goog.dom.isWindow = function(obj) {
+  return goog.isObject(obj) && obj['window'] == obj;
+};
+
+
+/**
+ * Returns an element's parent, if it's an Element.
+ * @param {Element} element The DOM element.
+ * @return {Element} The parent, or null if not an Element.
+ */
+goog.dom.getParentElement = function(element) {
+  var parent;
+  if (goog.dom.BrowserFeature.CAN_USE_PARENT_ELEMENT_PROPERTY) {
+    var isIe9 = goog.userAgent.IE &&
+        goog.userAgent.isVersionOrHigher('9') &&
+        !goog.userAgent.isVersionOrHigher('10');
+    // SVG elements in IE9 can't use the parentElement property.
+    // goog.global['SVGElement'] is not defined in IE9 quirks mode.
+    if (!(isIe9 && goog.global['SVGElement'] &&
+        element instanceof goog.global['SVGElement'])) {
+      parent = element.parentElement;
+      if (parent) {
+        return parent;
+      }
+    }
+  }
+  parent = element.parentNode;
+  return goog.dom.isElement(parent) ? /** @type {!Element} */ (parent) : null;
+};
+
+
+/**
+ * Whether a node contains another node.
+ * @param {Node} parent The node that should contain the other node.
+ * @param {Node} descendant The node to test presence of.
+ * @return {boolean} Whether the parent node contains the descendent node.
+ */
+goog.dom.contains = function(parent, descendant) {
+  // We use browser specific methods for this if available since it is faster
+  // that way.
+
+  // IE DOM
+  if (parent.contains && descendant.nodeType == goog.dom.NodeType.ELEMENT) {
+    return parent == descendant || parent.contains(descendant);
+  }
+
+  // W3C DOM Level 3
+  if (typeof parent.compareDocumentPosition != 'undefined') {
+    return parent == descendant ||
+        Boolean(parent.compareDocumentPosition(descendant) & 16);
+  }
+
+  // W3C DOM Level 1
+  while (descendant && parent != descendant) {
+    descendant = descendant.parentNode;
+  }
+  return descendant == parent;
+};
+
+
+/**
+ * Compares the document order of two nodes, returning 0 if they are the same
+ * node, a negative number if node1 is before node2, and a positive number if
+ * node2 is before node1.  Note that we compare the order the tags appear in the
+ * document so in the tree <b><i>text</i></b> the B node is considered to be
+ * before the I node.
+ *
+ * @param {Node} node1 The first node to compare.
+ * @param {Node} node2 The second node to compare.
+ * @return {number} 0 if the nodes are the same node, a negative number if node1
+ *     is before node2, and a positive number if node2 is before node1.
+ */
+goog.dom.compareNodeOrder = function(node1, node2) {
+  // Fall out quickly for equality.
+  if (node1 == node2) {
+    return 0;
+  }
+
+  // Use compareDocumentPosition where available
+  if (node1.compareDocumentPosition) {
+    // 4 is the bitmask for FOLLOWS.
+    return node1.compareDocumentPosition(node2) & 2 ? 1 : -1;
+  }
+
+  // Special case for document nodes on IE 7 and 8.
+  if (goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(9)) {
+    if (node1.nodeType == goog.dom.NodeType.DOCUMENT) {
+      return -1;
+    }
+    if (node2.nodeType == goog.dom.NodeType.DOCUMENT) {
+      return 1;
+    }
+  }
+
+  // Process in IE using sourceIndex - we check to see if the first node has
+  // a source index or if its parent has one.
+  if ('sourceIndex' in node1 ||
+      (node1.parentNode && 'sourceIndex' in node1.parentNode)) {
+    var isElement1 = node1.nodeType == goog.dom.NodeType.ELEMENT;
+    var isElement2 = node2.nodeType == goog.dom.NodeType.ELEMENT;
+
+    if (isElement1 && isElement2) {
+      return node1.sourceIndex - node2.sourceIndex;
+    } else {
+      var parent1 = node1.parentNode;
+      var parent2 = node2.parentNode;
+
+      if (parent1 == parent2) {
+        return goog.dom.compareSiblingOrder_(node1, node2);
+      }
+
+      if (!isElement1 && goog.dom.contains(parent1, node2)) {
+        return -1 * goog.dom.compareParentsDescendantNodeIe_(node1, node2);
+      }
+
+
+      if (!isElement2 && goog.dom.contains(parent2, node1)) {
+        return goog.dom.compareParentsDescendantNodeIe_(node2, node1);
+      }
+
+      return (isElement1 ? node1.sourceIndex : parent1.sourceIndex) -
+             (isElement2 ? node2.sourceIndex : parent2.sourceIndex);
+    }
+  }
+
+  // For Safari, we compare ranges.
+  var doc = goog.dom.getOwnerDocument(node1);
+
+  var range1, range2;
+  range1 = doc.createRange();
+  range1.selectNode(node1);
+  range1.collapse(true);
+
+  range2 = doc.createRange();
+  range2.selectNode(node2);
+  range2.collapse(true);
+
+  return range1.compareBoundaryPoints(goog.global['Range'].START_TO_END,
+      range2);
+};
+
+
+/**
+ * Utility function to compare the position of two nodes, when
+ * {@code textNode}'s parent is an ancestor of {@code node}.  If this entry
+ * condition is not met, this function will attempt to reference a null object.
+ * @param {!Node} textNode The textNode to compare.
+ * @param {Node} node The node to compare.
+ * @return {number} -1 if node is before textNode, +1 otherwise.
+ * @private
+ */
+goog.dom.compareParentsDescendantNodeIe_ = function(textNode, node) {
+  var parent = textNode.parentNode;
+  if (parent == node) {
+    // If textNode is a child of node, then node comes first.
+    return -1;
+  }
+  var sibling = node;
+  while (sibling.parentNode != parent) {
+    sibling = sibling.parentNode;
+  }
+  return goog.dom.compareSiblingOrder_(sibling, textNode);
+};
+
+
+/**
+ * Utility function to compare the position of two nodes known to be non-equal
+ * siblings.
+ * @param {Node} node1 The first node to compare.
+ * @param {!Node} node2 The second node to compare.
+ * @return {number} -1 if node1 is before node2, +1 otherwise.
+ * @private
+ */
+goog.dom.compareSiblingOrder_ = function(node1, node2) {
+  var s = node2;
+  while ((s = s.previousSibling)) {
+    if (s == node1) {
+      // We just found node1 before node2.
+      return -1;
+    }
+  }
+
+  // Since we didn't find it, node1 must be after node2.
+  return 1;
+};
+
+
+/**
+ * Find the deepest common ancestor of the given nodes.
+ * @param {...Node} var_args The nodes to find a common ancestor of.
+ * @return {Node} The common ancestor of the nodes, or null if there is none.
+ *     null will only be returned if two or more of the nodes are from different
+ *     documents.
+ */
+goog.dom.findCommonAncestor = function(var_args) {
+  var i, count = arguments.length;
+  if (!count) {
+    return null;
+  } else if (count == 1) {
+    return arguments[0];
+  }
+
+  var paths = [];
+  var minLength = Infinity;
+  for (i = 0; i < count; i++) {
+    // Compute the list of ancestors.
+    var ancestors = [];
+    var node = arguments[i];
+    while (node) {
+      ancestors.unshift(node);
+      node = node.parentNode;
+    }
+
+    // Save the list for comparison.
+    paths.push(ancestors);
+    minLength = Math.min(minLength, ancestors.length);
+  }
+  var output = null;
+  for (i = 0; i < minLength; i++) {
+    var first = paths[0][i];
+    for (var j = 1; j < count; j++) {
+      if (first != paths[j][i]) {
+        return output;
+      }
+    }
+    output = first;
+  }
+  return output;
+};
+
+
+/**
+ * Returns the owner document for a node.
+ * @param {Node|Window} node The node to get the document for.
+ * @return {!Document} The document owning the node.
+ */
+goog.dom.getOwnerDocument = function(node) {
+  // TODO(nnaze): Update param signature to be non-nullable.
+  goog.asserts.assert(node, 'Node cannot be null or undefined.');
+  return /** @type {!Document} */ (
+      node.nodeType == goog.dom.NodeType.DOCUMENT ? node :
+      node.ownerDocument || node.document);
+};
+
+
+/**
+ * Cross-browser function for getting the document element of a frame or iframe.
+ * @param {Element} frame Frame element.
+ * @return {!Document} The frame content document.
+ */
+goog.dom.getFrameContentDocument = function(frame) {
+  var doc = frame.contentDocument || frame.contentWindow.document;
+  return doc;
+};
+
+
+/**
+ * Cross-browser function for getting the window of a frame or iframe.
+ * @param {Element} frame Frame element.
+ * @return {Window} The window associated with the given frame.
+ */
+goog.dom.getFrameContentWindow = function(frame) {
+  return frame.contentWindow ||
+      goog.dom.getWindow(goog.dom.getFrameContentDocument(frame));
+};
+
+
+/**
+ * Sets the text content of a node, with cross-browser support.
+ * @param {Node} node The node to change the text content of.
+ * @param {string|number} text The value that should replace the node's content.
+ */
+goog.dom.setTextContent = function(node, text) {
+  goog.asserts.assert(node != null,
+      'goog.dom.setTextContent expects a non-null value for node');
+
+  if ('textContent' in node) {
+    node.textContent = text;
+  } else if (node.nodeType == goog.dom.NodeType.TEXT) {
+    node.data = text;
+  } else if (node.firstChild &&
+             node.firstChild.nodeType == goog.dom.NodeType.TEXT) {
+    // If the first child is a text node we just change its data and remove the
+    // rest of the children.
+    while (node.lastChild != node.firstChild) {
+      node.removeChild(node.lastChild);
+    }
+    node.firstChild.data = text;
+  } else {
+    goog.dom.removeChildren(node);
+    var doc = goog.dom.getOwnerDocument(node);
+    node.appendChild(doc.createTextNode(String(text)));
+  }
+};
+
+
+/**
+ * Gets the outerHTML of a node, which islike innerHTML, except that it
+ * actually contains the HTML of the node itself.
+ * @param {Element} element The element to get the HTML of.
+ * @return {string} The outerHTML of the given element.
+ */
+goog.dom.getOuterHtml = function(element) {
+  // IE, Opera and WebKit all have outerHTML.
+  if ('outerHTML' in element) {
+    return element.outerHTML;
+  } else {
+    var doc = goog.dom.getOwnerDocument(element);
+    var div = doc.createElement(goog.dom.TagName.DIV);
+    div.appendChild(element.cloneNode(true));
+    return div.innerHTML;
+  }
+};
+
+
+/**
+ * Finds the first descendant node that matches the filter function, using
+ * a depth first search. This function offers the most general purpose way
+ * of finding a matching element. You may also wish to consider
+ * {@code goog.dom.query} which can express many matching criteria using
+ * CSS selector expressions. These expressions often result in a more
+ * compact representation of the desired result.
+ * @see goog.dom.query
+ *
+ * @param {Node} root The root of the tree to search.
+ * @param {function(Node) : boolean} p The filter function.
+ * @return {Node|undefined} The found node or undefined if none is found.
+ */
+goog.dom.findNode = function(root, p) {
+  var rv = [];
+  var found = goog.dom.findNodes_(root, p, rv, true);
+  return found ? rv[0] : undefined;
+};
+
+
+/**
+ * Finds all the descendant nodes that match the filter function, using a
+ * a depth first search. This function offers the most general-purpose way
+ * of finding a set of matching elements. You may also wish to consider
+ * {@code goog.dom.query} which can express many matching criteria using
+ * CSS selector expressions. These expressions often result in a more
+ * compact representation of the desired result.
+
+ * @param {Node} root The root of the tree to search.
+ * @param {function(Node) : boolean} p The filter function.
+ * @return {!Array<!Node>} The found nodes or an empty array if none are found.
+ */
+goog.dom.findNodes = function(root, p) {
+  var rv = [];
+  goog.dom.findNodes_(root, p, rv, false);
+  return rv;
+};
+
+
+/**
+ * Finds the first or all the descendant nodes that match the filter function,
+ * using a depth first search.
+ * @param {Node} root The root of the tree to search.
+ * @param {function(Node) : boolean} p The filter function.
+ * @param {!Array<!Node>} rv The found nodes are added to this array.
+ * @param {boolean} findOne If true we exit after the first found node.
+ * @return {boolean} Whether the search is complete or not. True in case findOne
+ *     is true and the node is found. False otherwise.
+ * @private
+ */
+goog.dom.findNodes_ = function(root, p, rv, findOne) {
+  if (root != null) {
+    var child = root.firstChild;
+    while (child) {
+      if (p(child)) {
+        rv.push(child);
+        if (findOne) {
+          return true;
+        }
+      }
+      if (goog.dom.findNodes_(child, p, rv, findOne)) {
+        return true;
+      }
+      child = child.nextSibling;
+    }
+  }
+  return false;
+};
+
+
+/**
+ * Map of tags whose content to ignore when calculating text length.
+ * @private {!Object<string, number>}
+ * @const
+ */
+goog.dom.TAGS_TO_IGNORE_ = {
+  'SCRIPT': 1,
+  'STYLE': 1,
+  'HEAD': 1,
+  'IFRAME': 1,
+  'OBJECT': 1
+};
+
+
+/**
+ * Map of tags which have predefined values with regard to whitespace.
+ * @private {!Object<string, string>}
+ * @const
+ */
+goog.dom.PREDEFINED_TAG_VALUES_ = {'IMG': ' ', 'BR': '\n'};
+
+
+/**
+ * Returns true if the element has a tab index that allows it to receive
+ * keyboard focus (tabIndex >= 0), false otherwise.  Note that some elements
+ * natively support keyboard focus, even if they have no tab index.
+ * @param {!Element} element Element to check.
+ * @return {boolean} Whether the element has a tab index that allows keyboard
+ *     focus.
+ * @see http://fluidproject.org/blog/2008/01/09/getting-setting-and-removing-tabindex-values-with-javascript/
+ */
+goog.dom.isFocusableTabIndex = function(element) {
+  return goog.dom.hasSpecifiedTabIndex_(element) &&
+         goog.dom.isTabIndexFocusable_(element);
+};
+
+
+/**
+ * Enables or disables keyboard focus support on the element via its tab index.
+ * Only elements for which {@link goog.dom.isFocusableTabIndex} returns true
+ * (or elements that natively support keyboard focus, like form elements) can
+ * receive keyboard focus.  See http://go/tabindex for more info.
+ * @param {Element} element Element whose tab index is to be changed.
+ * @param {boolean} enable Whether to set or remove a tab index on the element
+ *     that supports keyboard focus.
+ */
+goog.dom.setFocusableTabIndex = function(element, enable) {
+  if (enable) {
+    element.tabIndex = 0;
+  } else {
+    // Set tabIndex to -1 first, then remove it. This is a workaround for
+    // Safari (confirmed in version 4 on Windows). When removing the attribute
+    // without setting it to -1 first, the element remains keyboard focusable
+    // despite not having a tabIndex attribute anymore.
+    element.tabIndex = -1;
+    element.removeAttribute('tabIndex'); // Must be camelCase!
+  }
+};
+
+
+/**
+ * Returns true if the element can be focused, i.e. it has a tab index that
+ * allows it to receive keyboard focus (tabIndex >= 0), or it is an element
+ * that natively supports keyboard focus.
+ * @param {!Element} element Element to check.
+ * @return {boolean} Whether the element allows keyboard focus.
+ */
+goog.dom.isFocusable = function(element) {
+  var focusable;
+  // Some elements can have unspecified tab index and still receive focus.
+  if (goog.dom.nativelySupportsFocus_(element)) {
+    // Make sure the element is not disabled ...
+    focusable = !element.disabled &&
+        // ... and if a tab index is specified, it allows focus.
+        (!goog.dom.hasSpecifiedTabIndex_(element) ||
+         goog.dom.isTabIndexFocusable_(element));
+  } else {
+    focusable = goog.dom.isFocusableTabIndex(element);
+  }
+
+  // IE requires elements to be visible in order to focus them.
+  return focusable && goog.userAgent.IE ?
+             goog.dom.hasNonZeroBoundingRect_(element) : focusable;
+};
+
+
+/**
+ * Returns true if the element has a specified tab index.
+ * @param {!Element} element Element to check.
+ * @return {boolean} Whether the element has a specified tab index.
+ * @private
+ */
+goog.dom.hasSpecifiedTabIndex_ = function(element) {
+  // IE returns 0 for an unset tabIndex, so we must use getAttributeNode(),
+  // which returns an object with a 'specified' property if tabIndex is
+  // specified.  This works on other browsers, too.
+  var attrNode = element.getAttributeNode('tabindex'); // Must be lowercase!
+  return goog.isDefAndNotNull(attrNode) && attrNode.specified;
+};
+
+
+/**
+ * Returns true if the element's tab index allows the element to be focused.
+ * @param {!Element} element Element to check.
+ * @return {boolean} Whether the element's tab index allows focus.
+ * @private
+ */
+goog.dom.isTabIndexFocusable_ = function(element) {
+  var index = element.tabIndex;
+  // NOTE: IE9 puts tabIndex in 16-bit int, e.g. -2 is 65534.
+  return goog.isNumber(index) && index >= 0 && index < 32768;
+};
+
+
+/**
+ * Returns true if the element is focusable even when tabIndex is not set.
+ * @param {!Element} element Element to check.
+ * @return {boolean} Whether the element natively supports focus.
+ * @private
+ */
+goog.dom.nativelySupportsFocus_ = function(element) {
+  return element.tagName == goog.dom.TagName.A ||
+         element.tagName == goog.dom.TagName.INPUT ||
+         element.tagName == goog.dom.TagName.TEXTAREA ||
+         element.tagName == goog.dom.TagName.SELECT ||
+         element.tagName == goog.dom.TagName.BUTTON;
+};
+
+
+/**
+ * Returns true if the element has a bounding rectangle that would be visible
+ * (i.e. its width and height are greater than zero).
+ * @param {!Element} element Element to check.
+ * @return {boolean} Whether the element has a non-zero bounding rectangle.
+ * @private
+ */
+goog.dom.hasNonZeroBoundingRect_ = function(element) {
+  var rect = goog.isFunction(element['getBoundingClientRect']) ?
+      element.getBoundingClientRect() :
+      {'height': element.offsetHeight, 'width': element.offsetWidth};
+  return goog.isDefAndNotNull(rect) && rect.height > 0 && rect.width > 0;
+};
+
+
+/**
+ * Returns the text content of the current node, without markup and invisible
+ * symbols. New lines are stripped and whitespace is collapsed,
+ * such that each character would be visible.
+ *
+ * In browsers that support it, innerText is used.  Other browsers attempt to
+ * simulate it via node traversal.  Line breaks are canonicalized in IE.
+ *
+ * @param {Node} node The node from which we are getting content.
+ * @return {string} The text content.
+ */
+goog.dom.getTextContent = function(node) {
+  var textContent;
+  // Note(arv): IE9, Opera, and Safari 3 support innerText but they include
+  // text nodes in script tags. So we revert to use a user agent test here.
+  if (goog.dom.BrowserFeature.CAN_USE_INNER_TEXT && ('innerText' in node)) {
+    textContent = goog.string.canonicalizeNewlines(node.innerText);
+    // Unfortunately .innerText() returns text with &shy; symbols
+    // We need to filter it out and then remove duplicate whitespaces
+  } else {
+    var buf = [];
+    goog.dom.getTextContent_(node, buf, true);
+    textContent = buf.join('');
+  }
+
+  // Strip &shy; entities. goog.format.insertWordBreaks inserts them in Opera.
+  textContent = textContent.replace(/ \xAD /g, ' ').replace(/\xAD/g, '');
+  // Strip &#8203; entities. goog.format.insertWordBreaks inserts them in IE8.
+  textContent = textContent.replace(/\u200B/g, '');
+
+  // Skip this replacement on old browsers with working innerText, which
+  // automatically turns &nbsp; into ' ' and / +/ into ' ' when reading
+  // innerText.
+  if (!goog.dom.BrowserFeature.CAN_USE_INNER_TEXT) {
+    textContent = textContent.replace(/ +/g, ' ');
+  }
+  if (textContent != ' ') {
+    textContent = textContent.replace(/^\s*/, '');
+  }
+
+  return textContent;
+};
+
+
+/**
+ * Returns the text content of the current node, without markup.
+ *
+ * Unlike {@code getTextContent} this method does not collapse whitespaces
+ * or normalize lines breaks.
+ *
+ * @param {Node} node The node from which we are getting content.
+ * @return {string} The raw text content.
+ */
+goog.dom.getRawTextContent = function(node) {
+  var buf = [];
+  goog.dom.getTextContent_(node, buf, false);
+
+  return buf.join('');
+};
+
+
+/**
+ * Recursive support function for text content retrieval.
+ *
+ * @param {Node} node The node from which we are getting content.
+ * @param {Array<string>} buf string buffer.
+ * @param {boolean} normalizeWhitespace Whether to normalize whitespace.
+ * @private
+ */
+goog.dom.getTextContent_ = function(node, buf, normalizeWhitespace) {
+  if (node.nodeName in goog.dom.TAGS_TO_IGNORE_) {
+    // ignore certain tags
+  } else if (node.nodeType == goog.dom.NodeType.TEXT) {
+    if (normalizeWhitespace) {
+      buf.push(String(node.nodeValue).replace(/(\r\n|\r|\n)/g, ''));
+    } else {
+      buf.push(node.nodeValue);
+    }
+  } else if (node.nodeName in goog.dom.PREDEFINED_TAG_VALUES_) {
+    buf.push(goog.dom.PREDEFINED_TAG_VALUES_[node.nodeName]);
+  } else {
+    var child = node.firstChild;
+    while (child) {
+      goog.dom.getTextContent_(child, buf, normalizeWhitespace);
+      child = child.nextSibling;
+    }
+  }
+};
+
+
+/**
+ * Returns the text length of the text contained in a node, without markup. This
+ * is equivalent to the selection length if the node was selected, or the number
+ * of cursor movements to traverse the node. Images & BRs take one space.  New
+ * lines are ignored.
+ *
+ * @param {Node} node The node whose text content length is being calculated.
+ * @return {number} The length of {@code node}'s text content.
+ */
+goog.dom.getNodeTextLength = function(node) {
+  return goog.dom.getTextContent(node).length;
+};
+
+
+/**
+ * Returns the text offset of a node relative to one of its ancestors. The text
+ * length is the same as the length calculated by goog.dom.getNodeTextLength.
+ *
+ * @param {Node} node The node whose offset is being calculated.
+ * @param {Node=} opt_offsetParent The node relative to which the offset will
+ *     be calculated. Defaults to the node's owner document's body.
+ * @return {number} The text offset.
+ */
+goog.dom.getNodeTextOffset = function(node, opt_offsetParent) {
+  var root = opt_offsetParent || goog.dom.getOwnerDocument(node).body;
+  var buf = [];
+  while (node && node != root) {
+    var cur = node;
+    while ((cur = cur.previousSibling)) {
+      buf.unshift(goog.dom.getTextContent(cur));
+    }
+    node = node.parentNode;
+  }
+  // Trim left to deal with FF cases when there might be line breaks and empty
+  // nodes at the front of the text
+  return goog.string.trimLeft(buf.join('')).replace(/ +/g, ' ').length;
+};
+
+
+/**
+ * Returns the node at a given offset in a parent node.  If an object is
+ * provided for the optional third parameter, the node and the remainder of the
+ * offset will stored as properties of this object.
+ * @param {Node} parent The parent node.
+ * @param {number} offset The offset into the parent node.
+ * @param {Object=} opt_result Object to be used to store the return value. The
+ *     return value will be stored in the form {node: Node, remainder: number}
+ *     if this object is provided.
+ * @return {Node} The node at the given offset.
+ */
+goog.dom.getNodeAtOffset = function(parent, offset, opt_result) {
+  var stack = [parent], pos = 0, cur = null;
+  while (stack.length > 0 && pos < offset) {
+    cur = stack.pop();
+    if (cur.nodeName in goog.dom.TAGS_TO_IGNORE_) {
+      // ignore certain tags
+    } else if (cur.nodeType == goog.dom.NodeType.TEXT) {
+      var text = cur.nodeValue.replace(/(\r\n|\r|\n)/g, '').replace(/ +/g, ' ');
+      pos += text.length;
+    } else if (cur.nodeName in goog.dom.PREDEFINED_TAG_VALUES_) {
+      pos += goog.dom.PREDEFINED_TAG_VALUES_[cur.nodeName].length;
+    } else {
+      for (var i = cur.childNodes.length - 1; i >= 0; i--) {
+        stack.push(cur.childNodes[i]);
+      }
+    }
+  }
+  if (goog.isObject(opt_result)) {
+    opt_result.remainder = cur ? cur.nodeValue.length + offset - pos - 1 : 0;
+    opt_result.node = cur;
+  }
+
+  return cur;
+};
+
+
+/**
+ * Returns true if the object is a {@code NodeList}.  To qualify as a NodeList,
+ * the object must have a numeric length property and an item function (which
+ * has type 'string' on IE for some reason).
+ * @param {Object} val Object to test.
+ * @return {boolean} Whether the object is a NodeList.
+ */
+goog.dom.isNodeList = function(val) {
+  // TODO(attila): Now the isNodeList is part of goog.dom we can use
+  // goog.userAgent to make this simpler.
+  // A NodeList must have a length property of type 'number' on all platforms.
+  if (val && typeof val.length == 'number') {
+    // A NodeList is an object everywhere except Safari, where it's a function.
+    if (goog.isObject(val)) {
+      // A NodeList must have an item function (on non-IE platforms) or an item
+      // property of type 'string' (on IE).
+      return typeof val.item == 'function' || typeof val.item == 'string';
+    } else if (goog.isFunction(val)) {
+      // On Safari, a NodeList is a function with an item property that is also
+      // a function.
+      return typeof val.item == 'function';
+    }
+  }
+
+  // Not a NodeList.
+  return false;
+};
+
+
+/**
+ * Walks up the DOM hierarchy returning the first ancestor that has the passed
+ * tag name and/or class name. If the passed element matches the specified
+ * criteria, the element itself is returned.
+ * @param {Node} element The DOM node to start with.
+ * @param {?(goog.dom.TagName|string)=} opt_tag The tag name to match (or
+ *     null/undefined to match only based on class name).
+ * @param {?string=} opt_class The class name to match (or null/undefined to
+ *     match only based on tag name).
+ * @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
+ *     dom.
+ * @return {Element} The first ancestor that matches the passed criteria, or
+ *     null if no match is found.
+ */
+goog.dom.getAncestorByTagNameAndClass = function(element, opt_tag, opt_class,
+    opt_maxSearchSteps) {
+  if (!opt_tag && !opt_class) {
+    return null;
+  }
+  var tagName = opt_tag ? opt_tag.toUpperCase() : null;
+  return /** @type {Element} */ (goog.dom.getAncestor(element,
+      function(node) {
+        return (!tagName || node.nodeName == tagName) &&
+               (!opt_class || goog.isString(node.className) &&
+                   goog.array.contains(node.className.split(/\s+/), opt_class));
+      }, true, opt_maxSearchSteps));
+};
+
+
+/**
+ * Walks up the DOM hierarchy returning the first ancestor that has the passed
+ * class name. If the passed element matches the specified criteria, the
+ * element itself is returned.
+ * @param {Node} element The DOM node to start with.
+ * @param {string} className The class name to match.
+ * @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
+ *     dom.
+ * @return {Element} The first ancestor that matches the passed criteria, or
+ *     null if none match.
+ */
+goog.dom.getAncestorByClass = function(element, className, opt_maxSearchSteps) {
+  return goog.dom.getAncestorByTagNameAndClass(element, null, className,
+      opt_maxSearchSteps);
+};
+
+
+/**
+ * Walks up the DOM hierarchy returning the first ancestor that passes the
+ * matcher function.
+ * @param {Node} element The DOM node to start with.
+ * @param {function(Node) : boolean} matcher A function that returns true if the
+ *     passed node matches the desired criteria.
+ * @param {boolean=} opt_includeNode If true, the node itself is included in
+ *     the search (the first call to the matcher will pass startElement as
+ *     the node to test).
+ * @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
+ *     dom.
+ * @return {Node} DOM node that matched the matcher, or null if there was
+ *     no match.
+ */
+goog.dom.getAncestor = function(
+    element, matcher, opt_includeNode, opt_maxSearchSteps) {
+  if (!opt_includeNode) {
+    element = element.parentNode;
+  }
+  var ignoreSearchSteps = opt_maxSearchSteps == null;
+  var steps = 0;
+  while (element && (ignoreSearchSteps || steps <= opt_maxSearchSteps)) {
+    goog.asserts.assert(element.name != 'parentNode');
+    if (matcher(element)) {
+      return element;
+    }
+    element = element.parentNode;
+    steps++;
+  }
+  // Reached the root of the DOM without a match
+  return null;
+};
+
+
+/**
+ * Determines the active element in the given document.
+ * @param {Document} doc The document to look in.
+ * @return {Element} The active element.
+ */
+goog.dom.getActiveElement = function(doc) {
+  try {
+    return doc && doc.activeElement;
+  } catch (e) {
+    // NOTE(nicksantos): Sometimes, evaluating document.activeElement in IE
+    // throws an exception. I'm not 100% sure why, but I suspect it chokes
+    // on document.activeElement if the activeElement has been recently
+    // removed from the DOM by a JS operation.
+    //
+    // We assume that an exception here simply means
+    // "there is no active element."
+  }
+
+  return null;
+};
+
+
+/**
+ * Gives the current devicePixelRatio.
+ *
+ * By default, this is the value of window.devicePixelRatio (which should be
+ * preferred if present).
+ *
+ * If window.devicePixelRatio is not present, the ratio is calculated with
+ * window.matchMedia, if present. Otherwise, gives 1.0.
+ *
+ * Some browsers (including Chrome) consider the browser zoom level in the pixel
+ * ratio, so the value may change across multiple calls.
+ *
+ * @return {number} The number of actual pixels per virtual pixel.
+ */
+goog.dom.getPixelRatio = function() {
+  var win = goog.dom.getWindow();
+  if (goog.isDef(win.devicePixelRatio)) {
+    return win.devicePixelRatio;
+  } else if (win.matchMedia) {
+    return goog.dom.matchesPixelRatio_(.75) ||
+           goog.dom.matchesPixelRatio_(1.5) ||
+           goog.dom.matchesPixelRatio_(2) ||
+           goog.dom.matchesPixelRatio_(3) || 1;
+  }
+  return 1;
+};
+
+
+/**
+ * Calculates a mediaQuery to check if the current device supports the
+ * given actual to virtual pixel ratio.
+ * @param {number} pixelRatio The ratio of actual pixels to virtual pixels.
+ * @return {number} pixelRatio if applicable, otherwise 0.
+ * @private
+ */
+goog.dom.matchesPixelRatio_ = function(pixelRatio) {
+  var win = goog.dom.getWindow();
+  var query = ('(-webkit-min-device-pixel-ratio: ' + pixelRatio + '),' +
+               '(min--moz-device-pixel-ratio: ' + pixelRatio + '),' +
+               '(min-resolution: ' + pixelRatio + 'dppx)');
+  return win.matchMedia(query).matches ? pixelRatio : 0;
+};
+
+
+
+/**
+ * Create an instance of a DOM helper with a new document object.
+ * @param {Document=} opt_document Document object to associate with this
+ *     DOM helper.
+ * @constructor
+ */
+goog.dom.DomHelper = function(opt_document) {
+  /**
+   * Reference to the document object to use
+   * @type {!Document}
+   * @private
+   */
+  this.document_ = opt_document || goog.global.document || document;
+};
+
+
+/**
+ * Gets the dom helper object for the document where the element resides.
+ * @param {Node=} opt_node If present, gets the DomHelper for this node.
+ * @return {!goog.dom.DomHelper} The DomHelper.
+ */
+goog.dom.DomHelper.prototype.getDomHelper = goog.dom.getDomHelper;
+
+
+/**
+ * Sets the document object.
+ * @param {!Document} document Document object.
+ */
+goog.dom.DomHelper.prototype.setDocument = function(document) {
+  this.document_ = document;
+};
+
+
+/**
+ * Gets the document object being used by the dom library.
+ * @return {!Document} Document object.
+ */
+goog.dom.DomHelper.prototype.getDocument = function() {
+  return this.document_;
+};
+
+
+/**
+ * Alias for {@code getElementById}. If a DOM node is passed in then we just
+ * return that.
+ * @param {string|Element} element Element ID or a DOM node.
+ * @return {Element} The element with the given ID, or the node passed in.
+ */
+goog.dom.DomHelper.prototype.getElement = function(element) {
+  return goog.dom.getElementHelper_(this.document_, element);
+};
+
+
+/**
+ * Gets an element by id, asserting that the element is found.
+ *
+ * This is used when an element is expected to exist, and should fail with
+ * an assertion error if it does not (if assertions are enabled).
+ *
+ * @param {string} id Element ID.
+ * @return {!Element} The element with the given ID, if it exists.
+ */
+goog.dom.DomHelper.prototype.getRequiredElement = function(id) {
+  return goog.dom.getRequiredElementHelper_(this.document_, id);
+};
+
+
+/**
+ * Alias for {@code getElement}.
+ * @param {string|Element} element Element ID or a DOM node.
+ * @return {Element} The element with the given ID, or the node passed in.
+ * @deprecated Use {@link goog.dom.DomHelper.prototype.getElement} instead.
+ */
+goog.dom.DomHelper.prototype.$ = goog.dom.DomHelper.prototype.getElement;
+
+
+/**
+ * Looks up elements by both tag and class name, using browser native functions
+ * ({@code querySelectorAll}, {@code getElementsByTagName} or
+ * {@code getElementsByClassName}) where possible. The returned array is a live
+ * NodeList or a static list depending on the code path taken.
+ *
+ * @see goog.dom.query
+ *
+ * @param {?string=} opt_tag Element tag name or * for all tags.
+ * @param {?string=} opt_class Optional class name.
+ * @param {(Document|Element)=} opt_el Optional element to look in.
+ * @return { {length: number} } Array-like list of elements (only a length
+ *     property and numerical indices are guaranteed to exist).
+ */
+goog.dom.DomHelper.prototype.getElementsByTagNameAndClass = function(opt_tag,
+                                                                     opt_class,
+                                                                     opt_el) {
+  return goog.dom.getElementsByTagNameAndClass_(this.document_, opt_tag,
+                                                opt_class, opt_el);
+};
+
+
+/**
+ * Returns an array of all the elements with the provided className.
+ * @see {goog.dom.query}
+ * @param {string} className the name of the class to look for.
+ * @param {Element|Document=} opt_el Optional element to look in.
+ * @return { {length: number} } The items found with the class name provided.
+ */
+goog.dom.DomHelper.prototype.getElementsByClass = function(className, opt_el) {
+  var doc = opt_el || this.document_;
+  return goog.dom.getElementsByClass(className, doc);
+};
+
+
+/**
+ * Returns the first element we find matching the provided class name.
+ * @see {goog.dom.query}
+ * @param {string} className the name of the class to look for.
+ * @param {(Element|Document)=} opt_el Optional element to look in.
+ * @return {Element} The first item found with the class name provided.
+ */
+goog.dom.DomHelper.prototype.getElementByClass = function(className, opt_el) {
+  var doc = opt_el || this.document_;
+  return goog.dom.getElementByClass(className, doc);
+};
+
+
+/**
+ * Ensures an element with the given className exists, and then returns the
+ * first element with the provided className.
+ * @see {goog.dom.query}
+ * @param {string} className the name of the class to look for.
+ * @param {(!Element|!Document)=} opt_root Optional element or document to look
+ *     in.
+ * @return {!Element} The first item found with the class name provided.
+ * @throws {goog.asserts.AssertionError} Thrown if no element is found.
+ */
+goog.dom.DomHelper.prototype.getRequiredElementByClass = function(className,
+                                                                  opt_root) {
+  var root = opt_root || this.document_;
+  return goog.dom.getRequiredElementByClass(className, root);
+};
+
+
+/**
+ * Alias for {@code getElementsByTagNameAndClass}.
+ * @deprecated Use DomHelper getElementsByTagNameAndClass.
+ * @see goog.dom.query
+ *
+ * @param {?string=} opt_tag Element tag name.
+ * @param {?string=} opt_class Optional class name.
+ * @param {Element=} opt_el Optional element to look in.
+ * @return { {length: number} } Array-like list of elements (only a length
+ *     property and numerical indices are guaranteed to exist).
+ */
+goog.dom.DomHelper.prototype.$$ =
+    goog.dom.DomHelper.prototype.getElementsByTagNameAndClass;
+
+
+/**
+ * Sets a number of properties on a node.
+ * @param {Element} element DOM node to set properties on.
+ * @param {Object} properties Hash of property:value pairs.
+ */
+goog.dom.DomHelper.prototype.setProperties = goog.dom.setProperties;
+
+
+/**
+ * Gets the dimensions of the viewport.
+ * @param {Window=} opt_window Optional window element to test. Defaults to
+ *     the window of the Dom Helper.
+ * @return {!goog.math.Size} Object with values 'width' and 'height'.
+ */
+goog.dom.DomHelper.prototype.getViewportSize = function(opt_window) {
+  // TODO(arv): This should not take an argument. That breaks the rule of a
+  // a DomHelper representing a single frame/window/document.
+  return goog.dom.getViewportSize(opt_window || this.getWindow());
+};
+
+
+/**
+ * Calculates the height of the document.
+ *
+ * @return {number} The height of the document.
+ */
+goog.dom.DomHelper.prototype.getDocumentHeight = function() {
+  return goog.dom.getDocumentHeight_(this.getWindow());
+};
+
+
+/**
+ * Typedef for use with goog.dom.createDom and goog.dom.append.
+ * @typedef {Object|string|Array|NodeList}
+ */
+goog.dom.Appendable;
+
+
+/**
+ * Returns a dom node with a set of attributes.  This function accepts varargs
+ * for subsequent nodes to be added.  Subsequent nodes will be added to the
+ * first node as childNodes.
+ *
+ * So:
+ * <code>createDom('div', null, createDom('p'), createDom('p'));</code>
+ * would return a div with two child paragraphs
+ *
+ * An easy way to move all child nodes of an existing element to a new parent
+ * element is:
+ * <code>createDom('div', null, oldElement.childNodes);</code>
+ * which will remove all child nodes from the old element and add them as
+ * child nodes of the new DIV.
+ *
+ * @param {string} tagName Tag to create.
+ * @param {Object|string=} opt_attributes If object, then a map of name-value
+ *     pairs for attributes. If a string, then this is the className of the new
+ *     element.
+ * @param {...goog.dom.Appendable} var_args Further DOM nodes or
+ *     strings for text nodes. If one of the var_args is an array or
+ *     NodeList, its elements will be added as childNodes instead.
+ * @return {!Element} Reference to a DOM node.
+ */
+goog.dom.DomHelper.prototype.createDom = function(tagName,
+                                                  opt_attributes,
+                                                  var_args) {
+  return goog.dom.createDom_(this.document_, arguments);
+};
+
+
+/**
+ * Alias for {@code createDom}.
+ * @param {string} tagName Tag to create.
+ * @param {(Object|string)=} opt_attributes If object, then a map of name-value
+ *     pairs for attributes. If a string, then this is the className of the new
+ *     element.
+ * @param {...goog.dom.Appendable} var_args Further DOM nodes or strings for
+ *     text nodes.  If one of the var_args is an array, its children will be
+ *     added as childNodes instead.
+ * @return {!Element} Reference to a DOM node.
+ * @deprecated Use {@link goog.dom.DomHelper.prototype.createDom} instead.
+ */
+goog.dom.DomHelper.prototype.$dom = goog.dom.DomHelper.prototype.createDom;
+
+
+/**
+ * Creates a new element.
+ * @param {string} name Tag name.
+ * @return {!Element} The new element.
+ */
+goog.dom.DomHelper.prototype.createElement = function(name) {
+  return this.document_.createElement(name);
+};
+
+
+/**
+ * Creates a new text node.
+ * @param {number|string} content Content.
+ * @return {!Text} The new text node.
+ */
+goog.dom.DomHelper.prototype.createTextNode = function(content) {
+  return this.document_.createTextNode(String(content));
+};
+
+
+/**
+ * Create a table.
+ * @param {number} rows The number of rows in the table.  Must be >= 1.
+ * @param {number} columns The number of columns in the table.  Must be >= 1.
+ * @param {boolean=} opt_fillWithNbsp If true, fills table entries with
+ *     {@code goog.string.Unicode.NBSP} characters.
+ * @return {!HTMLElement} The created table.
+ */
+goog.dom.DomHelper.prototype.createTable = function(rows, columns,
+    opt_fillWithNbsp) {
+  return goog.dom.createTable_(this.document_, rows, columns,
+      !!opt_fillWithNbsp);
+};
+
+
+/**
+ * Converts an HTML into a node or a document fragment. A single Node is used if
+ * {@code html} only generates a single node. If {@code html} generates multiple
+ * nodes then these are put inside a {@code DocumentFragment}.
+ * @param {!goog.html.SafeHtml} html The HTML markup to convert.
+ * @return {!Node} The resulting node.
+ */
+goog.dom.DomHelper.prototype.safeHtmlToNode = function(html) {
+  return goog.dom.safeHtmlToNode_(this.document_, html);
+};
+
+
+/**
+ * Converts an HTML string into a node or a document fragment.  A single Node
+ * is used if the {@code htmlString} only generates a single node.  If the
+ * {@code htmlString} generates multiple nodes then these are put inside a
+ * {@code DocumentFragment}.
+ *
+ * @param {string} htmlString The HTML string to convert.
+ * @return {!Node} The resulting node.
+ */
+goog.dom.DomHelper.prototype.htmlToDocumentFragment = function(htmlString) {
+  return goog.dom.htmlToDocumentFragment_(this.document_, htmlString);
+};
+
+
+/**
+ * Returns true if the browser is in "CSS1-compatible" (standards-compliant)
+ * mode, false otherwise.
+ * @return {boolean} True if in CSS1-compatible mode.
+ */
+goog.dom.DomHelper.prototype.isCss1CompatMode = function() {
+  return goog.dom.isCss1CompatMode_(this.document_);
+};
+
+
+/**
+ * Gets the window object associated with the document.
+ * @return {!Window} The window associated with the given document.
+ */
+goog.dom.DomHelper.prototype.getWindow = function() {
+  return goog.dom.getWindow_(this.document_);
+};
+
+
+/**
+ * Gets the document scroll element.
+ * @return {!Element} Scrolling element.
+ */
+goog.dom.DomHelper.prototype.getDocumentScrollElement = function() {
+  return goog.dom.getDocumentScrollElement_(this.document_);
+};
+
+
+/**
+ * Gets the document scroll distance as a coordinate object.
+ * @return {!goog.math.Coordinate} Object with properties 'x' and 'y'.
+ */
+goog.dom.DomHelper.prototype.getDocumentScroll = function() {
+  return goog.dom.getDocumentScroll_(this.document_);
+};
+
+
+/**
+ * Determines the active element in the given document.
+ * @param {Document=} opt_doc The document to look in.
+ * @return {Element} The active element.
+ */
+goog.dom.DomHelper.prototype.getActiveElement = function(opt_doc) {
+  return goog.dom.getActiveElement(opt_doc || this.document_);
+};
+
+
+/**
+ * Appends a child to a node.
+ * @param {Node} parent Parent.
+ * @param {Node} child Child.
+ */
+goog.dom.DomHelper.prototype.appendChild = goog.dom.appendChild;
+
+
+/**
+ * Appends a node with text or other nodes.
+ * @param {!Node} parent The node to append nodes to.
+ * @param {...goog.dom.Appendable} var_args The things to append to the node.
+ *     If this is a Node it is appended as is.
+ *     If this is a string then a text node is appended.
+ *     If this is an array like object then fields 0 to length - 1 are appended.
+ */
+goog.dom.DomHelper.prototype.append = goog.dom.append;
+
+
+/**
+ * Determines if the given node can contain children, intended to be used for
+ * HTML generation.
+ *
+ * @param {Node} node The node to check.
+ * @return {boolean} Whether the node can contain children.
+ */
+goog.dom.DomHelper.prototype.canHaveChildren = goog.dom.canHaveChildren;
+
+
+/**
+ * Removes all the child nodes on a DOM node.
+ * @param {Node} node Node to remove children from.
+ */
+goog.dom.DomHelper.prototype.removeChildren = goog.dom.removeChildren;
+
+
+/**
+ * Inserts a new node before an existing reference node (i.e., as the previous
+ * sibling). If the reference node has no parent, then does nothing.
+ * @param {Node} newNode Node to insert.
+ * @param {Node} refNode Reference node to insert before.
+ */
+goog.dom.DomHelper.prototype.insertSiblingBefore = goog.dom.insertSiblingBefore;
+
+
+/**
+ * Inserts a new node after an existing reference node (i.e., as the next
+ * sibling). If the reference node has no parent, then does nothing.
+ * @param {Node} newNode Node to insert.
+ * @param {Node} refNode Reference node to insert after.
+ */
+goog.dom.DomHelper.prototype.insertSiblingAfter = goog.dom.insertSiblingAfter;
+
+
+/**
+ * Insert a child at a given index. If index is larger than the number of child
+ * nodes that the parent currently has, the node is inserted as the last child
+ * node.
+ * @param {Element} parent The element into which to insert the child.
+ * @param {Node} child The element to insert.
+ * @param {number} index The index at which to insert the new child node. Must
+ *     not be negative.
+ */
+goog.dom.DomHelper.prototype.insertChildAt = goog.dom.insertChildAt;
+
+
+/**
+ * Removes a node from its parent.
+ * @param {Node} node The node to remove.
+ * @return {Node} The node removed if removed; else, null.
+ */
+goog.dom.DomHelper.prototype.removeNode = goog.dom.removeNode;
+
+
+/**
+ * Replaces a node in the DOM tree. Will do nothing if {@code oldNode} has no
+ * parent.
+ * @param {Node} newNode Node to insert.
+ * @param {Node} oldNode Node to replace.
+ */
+goog.dom.DomHelper.prototype.replaceNode = goog.dom.replaceNode;
+
+
+/**
+ * Flattens an element. That is, removes it and replace it with its children.
+ * @param {Element} element The element to flatten.
+ * @return {Element|undefined} The original element, detached from the document
+ *     tree, sans children, or undefined if the element was already not in the
+ *     document.
+ */
+goog.dom.DomHelper.prototype.flattenElement = goog.dom.flattenElement;
+
+
+/**
+ * Returns an array containing just the element children of the given element.
+ * @param {Element} element The element whose element children we want.
+ * @return {!(Array|NodeList)} An array or array-like list of just the element
+ *     children of the given element.
+ */
+goog.dom.DomHelper.prototype.getChildren = goog.dom.getChildren;
+
+
+/**
+ * Returns the first child node that is an element.
+ * @param {Node} node The node to get the first child element of.
+ * @return {Element} The first child node of {@code node} that is an element.
+ */
+goog.dom.DomHelper.prototype.getFirstElementChild =
+    goog.dom.getFirstElementChild;
+
+
+/**
+ * Returns the last child node that is an element.
+ * @param {Node} node The node to get the last child element of.
+ * @return {Element} The last child node of {@code node} that is an element.
+ */
+goog.dom.DomHelper.prototype.getLastElementChild = goog.dom.getLastElementChild;
+
+
+/**
+ * Returns the first next sibling that is an element.
+ * @param {Node} node The node to get the next sibling element of.
+ * @return {Element} The next sibling of {@code node} that is an element.
+ */
+goog.dom.DomHelper.prototype.getNextElementSibling =
+    goog.dom.getNextElementSibling;
+
+
+/**
+ * Returns the first previous sibling that is an element.
+ * @param {Node} node The node to get the previous sibling element of.
+ * @return {Element} The first previous sibling of {@code node} that is
+ *     an element.
+ */
+goog.dom.DomHelper.prototype.getPreviousElementSibling =
+    goog.dom.getPreviousElementSibling;
+
+
+/**
+ * Returns the next node in source order from the given node.
+ * @param {Node} node The node.
+ * @return {Node} The next node in the DOM tree, or null if this was the last
+ *     node.
+ */
+goog.dom.DomHelper.prototype.getNextNode = goog.dom.getNextNode;
+
+
+/**
+ * Returns the previous node in source order from the given node.
+ * @param {Node} node The node.
+ * @return {Node} The previous node in the DOM tree, or null if this was the
+ *     first node.
+ */
+goog.dom.DomHelper.prototype.getPreviousNode = goog.dom.getPreviousNode;
+
+
+/**
+ * Whether the object looks like a DOM node.
+ * @param {?} obj The object being tested for node likeness.
+ * @return {boolean} Whether the object looks like a DOM node.
+ */
+goog.dom.DomHelper.prototype.isNodeLike = goog.dom.isNodeLike;
+
+
+/**
+ * Whether the object looks like an Element.
+ * @param {?} obj The object being tested for Element likeness.
+ * @return {boolean} Whether the object looks like an Element.
+ */
+goog.dom.DomHelper.prototype.isElement = goog.dom.isElement;
+
+
+/**
+ * Returns true if the specified value is a Window object. This includes the
+ * global window for HTML pages, and iframe windows.
+ * @param {?} obj Variable to test.
+ * @return {boolean} Whether the variable is a window.
+ */
+goog.dom.DomHelper.prototype.isWindow = goog.dom.isWindow;
+
+
+/**
+ * Returns an element's parent, if it's an Element.
+ * @param {Element} element The DOM element.
+ * @return {Element} The parent, or null if not an Element.
+ */
+goog.dom.DomHelper.prototype.getParentElement = goog.dom.getParentElement;
+
+
+/**
+ * Whether a node contains another node.
+ * @param {Node} parent The node that should contain the other node.
+ * @param {Node} descendant The node to test presence of.
+ * @return {boolean} Whether the parent node contains the descendent node.
+ */
+goog.dom.DomHelper.prototype.contains = goog.dom.contains;
+
+
+/**
+ * Compares the document order of two nodes, returning 0 if they are the same
+ * node, a negative number if node1 is before node2, and a positive number if
+ * node2 is before node1.  Note that we compare the order the tags appear in the
+ * document so in the tree <b><i>text</i></b> the B node is considered to be
+ * before the I node.
+ *
+ * @param {Node} node1 The first node to compare.
+ * @param {Node} node2 The second node to compare.
+ * @return {number} 0 if the nodes are the same node, a negative number if node1
+ *     is before node2, and a positive number if node2 is before node1.
+ */
+goog.dom.DomHelper.prototype.compareNodeOrder = goog.dom.compareNodeOrder;
+
+
+/**
+ * Find the deepest common ancestor of the given nodes.
+ * @param {...Node} var_args The nodes to find a common ancestor of.
+ * @return {Node} The common ancestor of the nodes, or null if there is none.
+ *     null will only be returned if two or more of the nodes are from different
+ *     documents.
+ */
+goog.dom.DomHelper.prototype.findCommonAncestor = goog.dom.findCommonAncestor;
+
+
+/**
+ * Returns the owner document for a node.
+ * @param {Node} node The node to get the document for.
+ * @return {!Document} The document owning the node.
+ */
+goog.dom.DomHelper.prototype.getOwnerDocument = goog.dom.getOwnerDocument;
+
+
+/**
+ * Cross browser function for getting the document element of an iframe.
+ * @param {Element} iframe Iframe element.
+ * @return {!Document} The frame content document.
+ */
+goog.dom.DomHelper.prototype.getFrameContentDocument =
+    goog.dom.getFrameContentDocument;
+
+
+/**
+ * Cross browser function for getting the window of a frame or iframe.
+ * @param {Element} frame Frame element.
+ * @return {Window} The window associated with the given frame.
+ */
+goog.dom.DomHelper.prototype.getFrameContentWindow =
+    goog.dom.getFrameContentWindow;
+
+
+/**
+ * Sets the text content of a node, with cross-browser support.
+ * @param {Node} node The node to change the text content of.
+ * @param {string|number} text The value that should replace the node's content.
+ */
+goog.dom.DomHelper.prototype.setTextContent = goog.dom.setTextContent;
+
+
+/**
+ * Gets the outerHTML of a node, which islike innerHTML, except that it
+ * actually contains the HTML of the node itself.
+ * @param {Element} element The element to get the HTML of.
+ * @return {string} The outerHTML of the given element.
+ */
+goog.dom.DomHelper.prototype.getOuterHtml = goog.dom.getOuterHtml;
+
+
+/**
+ * Finds the first descendant node that matches the filter function. This does
+ * a depth first search.
+ * @param {Node} root The root of the tree to search.
+ * @param {function(Node) : boolean} p The filter function.
+ * @return {Node|undefined} The found node or undefined if none is found.
+ */
+goog.dom.DomHelper.prototype.findNode = goog.dom.findNode;
+
+
+/**
+ * Finds all the descendant nodes that matches the filter function. This does a
+ * depth first search.
+ * @param {Node} root The root of the tree to search.
+ * @param {function(Node) : boolean} p The filter function.
+ * @return {Array<Node>} The found nodes or an empty array if none are found.
+ */
+goog.dom.DomHelper.prototype.findNodes = goog.dom.findNodes;
+
+
+/**
+ * Returns true if the element has a tab index that allows it to receive
+ * keyboard focus (tabIndex >= 0), false otherwise.  Note that some elements
+ * natively support keyboard focus, even if they have no tab index.
+ * @param {!Element} element Element to check.
+ * @return {boolean} Whether the element has a tab index that allows keyboard
+ *     focus.
+ */
+goog.dom.DomHelper.prototype.isFocusableTabIndex = goog.dom.isFocusableTabIndex;
+
+
+/**
+ * Enables or disables keyboard focus support on the element via its tab index.
+ * Only elements for which {@link goog.dom.isFocusableTabIndex} returns true
+ * (or elements that natively support keyboard focus, like form elements) can
+ * receive keyboard focus.  See http://go/tabindex for more info.
+ * @param {Element} element Element whose tab index is to be changed.
+ * @param {boolean} enable Whether to set or remove a tab index on the element
+ *     that supports keyboard focus.
+ */
+goog.dom.DomHelper.prototype.setFocusableTabIndex =
+    goog.dom.setFocusableTabIndex;
+
+
+/**
+ * Returns true if the element can be focused, i.e. it has a tab index that
+ * allows it to receive keyboard focus (tabIndex >= 0), or it is an element
+ * that natively supports keyboard focus.
+ * @param {!Element} element Element to check.
+ * @return {boolean} Whether the element allows keyboard focus.
+ */
+goog.dom.DomHelper.prototype.isFocusable = goog.dom.isFocusable;
+
+
+/**
+ * Returns the text contents of the current node, without markup. New lines are
+ * stripped and whitespace is collapsed, such that each character would be
+ * visible.
+ *
+ * In browsers that support it, innerText is used.  Other browsers attempt to
+ * simulate it via node traversal.  Line breaks are canonicalized in IE.
+ *
+ * @param {Node} node The node from which we are getting content.
+ * @return {string} The text content.
+ */
+goog.dom.DomHelper.prototype.getTextContent = goog.dom.getTextContent;
+
+
+/**
+ * Returns the text length of the text contained in a node, without markup. This
+ * is equivalent to the selection length if the node was selected, or the number
+ * of cursor movements to traverse the node. Images & BRs take one space.  New
+ * lines are ignored.
+ *
+ * @param {Node} node The node whose text content length is being calculated.
+ * @return {number} The length of {@code node}'s text content.
+ */
+goog.dom.DomHelper.prototype.getNodeTextLength = goog.dom.getNodeTextLength;
+
+
+/**
+ * Returns the text offset of a node relative to one of its ancestors. The text
+ * length is the same as the length calculated by
+ * {@code goog.dom.getNodeTextLength}.
+ *
+ * @param {Node} node The node whose offset is being calculated.
+ * @param {Node=} opt_offsetParent Defaults to the node's owner document's body.
+ * @return {number} The text offset.
+ */
+goog.dom.DomHelper.prototype.getNodeTextOffset = goog.dom.getNodeTextOffset;
+
+
+/**
+ * Returns the node at a given offset in a parent node.  If an object is
+ * provided for the optional third parameter, the node and the remainder of the
+ * offset will stored as properties of this object.
+ * @param {Node} parent The parent node.
+ * @param {number} offset The offset into the parent node.
+ * @param {Object=} opt_result Object to be used to store the return value. The
+ *     return value will be stored in the form {node: Node, remainder: number}
+ *     if this object is provided.
+ * @return {Node} The node at the given offset.
+ */
+goog.dom.DomHelper.prototype.getNodeAtOffset = goog.dom.getNodeAtOffset;
+
+
+/**
+ * Returns true if the object is a {@code NodeList}.  To qualify as a NodeList,
+ * the object must have a numeric length property and an item function (which
+ * has type 'string' on IE for some reason).
+ * @param {Object} val Object to test.
+ * @return {boolean} Whether the object is a NodeList.
+ */
+goog.dom.DomHelper.prototype.isNodeList = goog.dom.isNodeList;
+
+
+/**
+ * Walks up the DOM hierarchy returning the first ancestor that has the passed
+ * tag name and/or class name. If the passed element matches the specified
+ * criteria, the element itself is returned.
+ * @param {Node} element The DOM node to start with.
+ * @param {?(goog.dom.TagName|string)=} opt_tag The tag name to match (or
+ *     null/undefined to match only based on class name).
+ * @param {?string=} opt_class The class name to match (or null/undefined to
+ *     match only based on tag name).
+ * @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
+ *     dom.
+ * @return {Element} The first ancestor that matches the passed criteria, or
+ *     null if no match is found.
+ */
+goog.dom.DomHelper.prototype.getAncestorByTagNameAndClass =
+    goog.dom.getAncestorByTagNameAndClass;
+
+
+/**
+ * Walks up the DOM hierarchy returning the first ancestor that has the passed
+ * class name. If the passed element matches the specified criteria, the
+ * element itself is returned.
+ * @param {Node} element The DOM node to start with.
+ * @param {string} class The class name to match.
+ * @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
+ *     dom.
+ * @return {Element} The first ancestor that matches the passed criteria, or
+ *     null if none match.
+ */
+goog.dom.DomHelper.prototype.getAncestorByClass =
+    goog.dom.getAncestorByClass;
+
+
+/**
+ * Walks up the DOM hierarchy returning the first ancestor that passes the
+ * matcher function.
+ * @param {Node} element The DOM node to start with.
+ * @param {function(Node) : boolean} matcher A function that returns true if the
+ *     passed node matches the desired criteria.
+ * @param {boolean=} opt_includeNode If true, the node itself is included in
+ *     the search (the first call to the matcher will pass startElement as
+ *     the node to test).
+ * @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
+ *     dom.
+ * @return {Node} DOM node that matched the matcher, or null if there was
+ *     no match.
+ */
+goog.dom.DomHelper.prototype.getAncestor = goog.dom.getAncestor;
+
+// Copyright 2012 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Utilities for detecting, adding and removing classes.  Prefer
+ * this over goog.dom.classes for new code since it attempts to use classList
+ * (DOMTokenList: http://dom.spec.whatwg.org/#domtokenlist) which is faster
+ * and requires less code.
+ *
+ * Note: these utilities are meant to operate on HTMLElements
+ * and may have unexpected behavior on elements with differing interfaces
+ * (such as SVGElements).
+ */
+
+
+goog.provide('goog.dom.classlist');
+
+goog.require('goog.array');
+
+
+/**
+ * Override this define at build-time if you know your target supports it.
+ * @define {boolean} Whether to use the classList property (DOMTokenList).
+ */
+goog.define('goog.dom.classlist.ALWAYS_USE_DOM_TOKEN_LIST', false);
+
+
+/**
+ * Gets an array-like object of class names on an element.
+ * @param {Element} element DOM node to get the classes of.
+ * @return {!goog.array.ArrayLike} Class names on {@code element}.
+ */
+goog.dom.classlist.get = function(element) {
+  if (goog.dom.classlist.ALWAYS_USE_DOM_TOKEN_LIST || element.classList) {
+    return element.classList;
+  }
+
+  var className = element.className;
+  // Some types of elements don't have a className in IE (e.g. iframes).
+  // Furthermore, in Firefox, className is not a string when the element is
+  // an SVG element.
+  return goog.isString(className) && className.match(/\S+/g) || [];
+};
+
+
+/**
+ * Sets the entire class name of an element.
+ * @param {Element} element DOM node to set class of.
+ * @param {string} className Class name(s) to apply to element.
+ */
+goog.dom.classlist.set = function(element, className) {
+  element.className = className;
+};
+
+
+/**
+ * Returns true if an element has a class.  This method may throw a DOM
+ * exception for an invalid or empty class name if DOMTokenList is used.
+ * @param {Element} element DOM node to test.
+ * @param {string} className Class name to test for.
+ * @return {boolean} Whether element has the class.
+ */
+goog.dom.classlist.contains = function(element, className) {
+  if (goog.dom.classlist.ALWAYS_USE_DOM_TOKEN_LIST || element.classList) {
+    return element.classList.contains(className);
+  }
+  return goog.array.contains(goog.dom.classlist.get(element), className);
+};
+
+
+/**
+ * Adds a class to an element.  Does not add multiples of class names.  This
+ * method may throw a DOM exception for an invalid or empty class name if
+ * DOMTokenList is used.
+ * @param {Element} element DOM node to add class to.
+ * @param {string} className Class name to add.
+ */
+goog.dom.classlist.add = function(element, className) {
+  if (goog.dom.classlist.ALWAYS_USE_DOM_TOKEN_LIST || element.classList) {
+    element.classList.add(className);
+    return;
+  }
+
+  if (!goog.dom.classlist.contains(element, className)) {
+    // Ensure we add a space if this is not the first class name added.
+    element.className += element.className.length > 0 ?
+        (' ' + className) : className;
+  }
+};
+
+
+/**
+ * Convenience method to add a number of class names at once.
+ * @param {Element} element The element to which to add classes.
+ * @param {goog.array.ArrayLike<string>} classesToAdd An array-like object
+ * containing a collection of class names to add to the element.
+ * This method may throw a DOM exception if classesToAdd contains invalid
+ * or empty class names.
+ */
+goog.dom.classlist.addAll = function(element, classesToAdd) {
+  if (goog.dom.classlist.ALWAYS_USE_DOM_TOKEN_LIST || element.classList) {
+    goog.array.forEach(classesToAdd, function(className) {
+      goog.dom.classlist.add(element, className);
+    });
+    return;
+  }
+
+  var classMap = {};
+
+  // Get all current class names into a map.
+  goog.array.forEach(goog.dom.classlist.get(element),
+      function(className) {
+        classMap[className] = true;
+      });
+
+  // Add new class names to the map.
+  goog.array.forEach(classesToAdd,
+      function(className) {
+        classMap[className] = true;
+      });
+
+  // Flatten the keys of the map into the className.
+  element.className = '';
+  for (var className in classMap) {
+    element.className += element.className.length > 0 ?
+        (' ' + className) : className;
+  }
+};
+
+
+/**
+ * Removes a class from an element.  This method may throw a DOM exception
+ * for an invalid or empty class name if DOMTokenList is used.
+ * @param {Element} element DOM node to remove class from.
+ * @param {string} className Class name to remove.
+ */
+goog.dom.classlist.remove = function(element, className) {
+  if (goog.dom.classlist.ALWAYS_USE_DOM_TOKEN_LIST || element.classList) {
+    element.classList.remove(className);
+    return;
+  }
+
+  if (goog.dom.classlist.contains(element, className)) {
+    // Filter out the class name.
+    element.className = goog.array.filter(
+        goog.dom.classlist.get(element),
+        function(c) {
+          return c != className;
+        }).join(' ');
+  }
+};
+
+
+/**
+ * Removes a set of classes from an element.  Prefer this call to
+ * repeatedly calling {@code goog.dom.classlist.remove} if you want to remove
+ * a large set of class names at once.
+ * @param {Element} element The element from which to remove classes.
+ * @param {goog.array.ArrayLike<string>} classesToRemove An array-like object
+ * containing a collection of class names to remove from the element.
+ * This method may throw a DOM exception if classesToRemove contains invalid
+ * or empty class names.
+ */
+goog.dom.classlist.removeAll = function(element, classesToRemove) {
+  if (goog.dom.classlist.ALWAYS_USE_DOM_TOKEN_LIST || element.classList) {
+    goog.array.forEach(classesToRemove, function(className) {
+      goog.dom.classlist.remove(element, className);
+    });
+    return;
+  }
+  // Filter out those classes in classesToRemove.
+  element.className = goog.array.filter(
+      goog.dom.classlist.get(element),
+      function(className) {
+        // If this class is not one we are trying to remove,
+        // add it to the array of new class names.
+        return !goog.array.contains(classesToRemove, className);
+      }).join(' ');
+};
+
+
+/**
+ * Adds or removes a class depending on the enabled argument.  This method
+ * may throw a DOM exception for an invalid or empty class name if DOMTokenList
+ * is used.
+ * @param {Element} element DOM node to add or remove the class on.
+ * @param {string} className Class name to add or remove.
+ * @param {boolean} enabled Whether to add or remove the class (true adds,
+ *     false removes).
+ */
+goog.dom.classlist.enable = function(element, className, enabled) {
+  if (enabled) {
+    goog.dom.classlist.add(element, className);
+  } else {
+    goog.dom.classlist.remove(element, className);
+  }
+};
+
+
+/**
+ * Adds or removes a set of classes depending on the enabled argument.  This
+ * method may throw a DOM exception for an invalid or empty class name if
+ * DOMTokenList is used.
+ * @param {!Element} element DOM node to add or remove the class on.
+ * @param {goog.array.ArrayLike<string>} classesToEnable An array-like object
+ *     containing a collection of class names to add or remove from the element.
+ * @param {boolean} enabled Whether to add or remove the classes (true adds,
+ *     false removes).
+ */
+goog.dom.classlist.enableAll = function(element, classesToEnable, enabled) {
+  var f = enabled ? goog.dom.classlist.addAll :
+      goog.dom.classlist.removeAll;
+  f(element, classesToEnable);
+};
+
+
+/**
+ * Switches a class on an element from one to another without disturbing other
+ * classes. If the fromClass isn't removed, the toClass won't be added.  This
+ * method may throw a DOM exception if the class names are empty or invalid.
+ * @param {Element} element DOM node to swap classes on.
+ * @param {string} fromClass Class to remove.
+ * @param {string} toClass Class to add.
+ * @return {boolean} Whether classes were switched.
+ */
+goog.dom.classlist.swap = function(element, fromClass, toClass) {
+  if (goog.dom.classlist.contains(element, fromClass)) {
+    goog.dom.classlist.remove(element, fromClass);
+    goog.dom.classlist.add(element, toClass);
+    return true;
+  }
+  return false;
+};
+
+
+/**
+ * Removes a class if an element has it, and adds it the element doesn't have
+ * it.  Won't affect other classes on the node.  This method may throw a DOM
+ * exception if the class name is empty or invalid.
+ * @param {Element} element DOM node to toggle class on.
+ * @param {string} className Class to toggle.
+ * @return {boolean} True if class was added, false if it was removed
+ *     (in other words, whether element has the class after this function has
+ *     been called).
+ */
+goog.dom.classlist.toggle = function(element, className) {
+  var add = !goog.dom.classlist.contains(element, className);
+  goog.dom.classlist.enable(element, className, add);
+  return add;
+};
+
+
+/**
+ * Adds and removes a class of an element.  Unlike
+ * {@link goog.dom.classlist.swap}, this method adds the classToAdd regardless
+ * of whether the classToRemove was present and had been removed.  This method
+ * may throw a DOM exception if the class names are empty or invalid.
+ *
+ * @param {Element} element DOM node to swap classes on.
+ * @param {string} classToRemove Class to remove.
+ * @param {string} classToAdd Class to add.
+ */
+goog.dom.classlist.addRemove = function(element, classToRemove, classToAdd) {
+  goog.dom.classlist.remove(element, classToRemove);
+  goog.dom.classlist.add(element, classToAdd);
+};
+
+// Copyright 2012 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Vendor prefix getters.
+ */
+
+goog.provide('goog.dom.vendor');
+
+goog.require('goog.string');
+goog.require('goog.userAgent');
+
+
+/**
+ * Returns the JS vendor prefix used in CSS properties. Different vendors
+ * use different methods of changing the case of the property names.
+ *
+ * @return {?string} The JS vendor prefix or null if there is none.
+ */
+goog.dom.vendor.getVendorJsPrefix = function() {
+  if (goog.userAgent.WEBKIT) {
+    return 'Webkit';
+  } else if (goog.userAgent.GECKO) {
+    return 'Moz';
+  } else if (goog.userAgent.IE) {
+    return 'ms';
+  } else if (goog.userAgent.OPERA) {
+    return 'O';
+  }
+
+  return null;
+};
+
+
+/**
+ * Returns the vendor prefix used in CSS properties.
+ *
+ * @return {?string} The vendor prefix or null if there is none.
+ */
+goog.dom.vendor.getVendorPrefix = function() {
+  if (goog.userAgent.WEBKIT) {
+    return '-webkit';
+  } else if (goog.userAgent.GECKO) {
+    return '-moz';
+  } else if (goog.userAgent.IE) {
+    return '-ms';
+  } else if (goog.userAgent.OPERA) {
+    return '-o';
+  }
+
+  return null;
+};
+
+
+/**
+ * @param {string} propertyName A property name.
+ * @param {!Object=} opt_object If provided, we verify if the property exists in
+ *     the object.
+ * @return {?string} A vendor prefixed property name, or null if it does not
+ *     exist.
+ */
+goog.dom.vendor.getPrefixedPropertyName = function(propertyName, opt_object) {
+  // We first check for a non-prefixed property, if available.
+  if (opt_object && propertyName in opt_object) {
+    return propertyName;
+  }
+  var prefix = goog.dom.vendor.getVendorJsPrefix();
+  if (prefix) {
+    prefix = prefix.toLowerCase();
+    var prefixedPropertyName = prefix + goog.string.toTitleCase(propertyName);
+    return (!goog.isDef(opt_object) || prefixedPropertyName in opt_object) ?
+        prefixedPropertyName : null;
+  }
+  return null;
+};
+
+
+/**
+ * @param {string} eventType An event type.
+ * @return {string} A lower-cased vendor prefixed event type.
+ */
+goog.dom.vendor.getPrefixedEventType = function(eventType) {
+  var prefix = goog.dom.vendor.getVendorJsPrefix() || '';
+  return (prefix + eventType).toLowerCase();
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview A utility class for representing a numeric box.
+ */
+
+
+goog.provide('goog.math.Box');
+
+goog.require('goog.math.Coordinate');
+
+
+
+/**
+ * Class for representing a box. A box is specified as a top, right, bottom,
+ * and left. A box is useful for representing margins and padding.
+ *
+ * This class assumes 'screen coordinates': larger Y coordinates are further
+ * from the top of the screen.
+ *
+ * @param {number} top Top.
+ * @param {number} right Right.
+ * @param {number} bottom Bottom.
+ * @param {number} left Left.
+ * @struct
+ * @constructor
+ */
+goog.math.Box = function(top, right, bottom, left) {
+  /**
+   * Top
+   * @type {number}
+   */
+  this.top = top;
+
+  /**
+   * Right
+   * @type {number}
+   */
+  this.right = right;
+
+  /**
+   * Bottom
+   * @type {number}
+   */
+  this.bottom = bottom;
+
+  /**
+   * Left
+   * @type {number}
+   */
+  this.left = left;
+};
+
+
+/**
+ * Creates a Box by bounding a collection of goog.math.Coordinate objects
+ * @param {...goog.math.Coordinate} var_args Coordinates to be included inside
+ *     the box.
+ * @return {!goog.math.Box} A Box containing all the specified Coordinates.
+ */
+goog.math.Box.boundingBox = function(var_args) {
+  var box = new goog.math.Box(arguments[0].y, arguments[0].x,
+                              arguments[0].y, arguments[0].x);
+  for (var i = 1; i < arguments.length; i++) {
+    box.expandToIncludeCoordinate(arguments[i]);
+  }
+  return box;
+};
+
+
+/**
+ * @return {number} width The width of this Box.
+ */
+goog.math.Box.prototype.getWidth = function() {
+  return this.right - this.left;
+};
+
+
+/**
+ * @return {number} height The height of this Box.
+ */
+goog.math.Box.prototype.getHeight = function() {
+  return this.bottom - this.top;
+};
+
+
+/**
+ * Creates a copy of the box with the same dimensions.
+ * @return {!goog.math.Box} A clone of this Box.
+ */
+goog.math.Box.prototype.clone = function() {
+  return new goog.math.Box(this.top, this.right, this.bottom, this.left);
+};
+
+
+if (goog.DEBUG) {
+  /**
+   * Returns a nice string representing the box.
+   * @return {string} In the form (50t, 73r, 24b, 13l).
+   * @override
+   */
+  goog.math.Box.prototype.toString = function() {
+    return '(' + this.top + 't, ' + this.right + 'r, ' + this.bottom + 'b, ' +
+           this.left + 'l)';
+  };
+}
+
+
+/**
+ * Returns whether the box contains a coordinate or another box.
+ *
+ * @param {goog.math.Coordinate|goog.math.Box} other A Coordinate or a Box.
+ * @return {boolean} Whether the box contains the coordinate or other box.
+ */
+goog.math.Box.prototype.contains = function(other) {
+  return goog.math.Box.contains(this, other);
+};
+
+
+/**
+ * Expands box with the given margins.
+ *
+ * @param {number|goog.math.Box} top Top margin or box with all margins.
+ * @param {number=} opt_right Right margin.
+ * @param {number=} opt_bottom Bottom margin.
+ * @param {number=} opt_left Left margin.
+ * @return {!goog.math.Box} A reference to this Box.
+ */
+goog.math.Box.prototype.expand = function(top, opt_right, opt_bottom,
+    opt_left) {
+  if (goog.isObject(top)) {
+    this.top -= top.top;
+    this.right += top.right;
+    this.bottom += top.bottom;
+    this.left -= top.left;
+  } else {
+    this.top -= top;
+    this.right += opt_right;
+    this.bottom += opt_bottom;
+    this.left -= opt_left;
+  }
+
+  return this;
+};
+
+
+/**
+ * Expand this box to include another box.
+ * NOTE(user): This is used in code that needs to be very fast, please don't
+ * add functionality to this function at the expense of speed (variable
+ * arguments, accepting multiple argument types, etc).
+ * @param {goog.math.Box} box The box to include in this one.
+ */
+goog.math.Box.prototype.expandToInclude = function(box) {
+  this.left = Math.min(this.left, box.left);
+  this.top = Math.min(this.top, box.top);
+  this.right = Math.max(this.right, box.right);
+  this.bottom = Math.max(this.bottom, box.bottom);
+};
+
+
+/**
+ * Expand this box to include the coordinate.
+ * @param {!goog.math.Coordinate} coord The coordinate to be included
+ *     inside the box.
+ */
+goog.math.Box.prototype.expandToIncludeCoordinate = function(coord) {
+  this.top = Math.min(this.top, coord.y);
+  this.right = Math.max(this.right, coord.x);
+  this.bottom = Math.max(this.bottom, coord.y);
+  this.left = Math.min(this.left, coord.x);
+};
+
+
+/**
+ * Compares boxes for equality.
+ * @param {goog.math.Box} a A Box.
+ * @param {goog.math.Box} b A Box.
+ * @return {boolean} True iff the boxes are equal, or if both are null.
+ */
+goog.math.Box.equals = function(a, b) {
+  if (a == b) {
+    return true;
+  }
+  if (!a || !b) {
+    return false;
+  }
+  return a.top == b.top && a.right == b.right &&
+         a.bottom == b.bottom && a.left == b.left;
+};
+
+
+/**
+ * Returns whether a box contains a coordinate or another box.
+ *
+ * @param {goog.math.Box} box A Box.
+ * @param {goog.math.Coordinate|goog.math.Box} other A Coordinate or a Box.
+ * @return {boolean} Whether the box contains the coordinate or other box.
+ */
+goog.math.Box.contains = function(box, other) {
+  if (!box || !other) {
+    return false;
+  }
+
+  if (other instanceof goog.math.Box) {
+    return other.left >= box.left && other.right <= box.right &&
+        other.top >= box.top && other.bottom <= box.bottom;
+  }
+
+  // other is a Coordinate.
+  return other.x >= box.left && other.x <= box.right &&
+         other.y >= box.top && other.y <= box.bottom;
+};
+
+
+/**
+ * Returns the relative x position of a coordinate compared to a box.  Returns
+ * zero if the coordinate is inside the box.
+ *
+ * @param {goog.math.Box} box A Box.
+ * @param {goog.math.Coordinate} coord A Coordinate.
+ * @return {number} The x position of {@code coord} relative to the nearest
+ *     side of {@code box}, or zero if {@code coord} is inside {@code box}.
+ */
+goog.math.Box.relativePositionX = function(box, coord) {
+  if (coord.x < box.left) {
+    return coord.x - box.left;
+  } else if (coord.x > box.right) {
+    return coord.x - box.right;
+  }
+  return 0;
+};
+
+
+/**
+ * Returns the relative y position of a coordinate compared to a box.  Returns
+ * zero if the coordinate is inside the box.
+ *
+ * @param {goog.math.Box} box A Box.
+ * @param {goog.math.Coordinate} coord A Coordinate.
+ * @return {number} The y position of {@code coord} relative to the nearest
+ *     side of {@code box}, or zero if {@code coord} is inside {@code box}.
+ */
+goog.math.Box.relativePositionY = function(box, coord) {
+  if (coord.y < box.top) {
+    return coord.y - box.top;
+  } else if (coord.y > box.bottom) {
+    return coord.y - box.bottom;
+  }
+  return 0;
+};
+
+
+/**
+ * Returns the distance between a coordinate and the nearest corner/side of a
+ * box. Returns zero if the coordinate is inside the box.
+ *
+ * @param {goog.math.Box} box A Box.
+ * @param {goog.math.Coordinate} coord A Coordinate.
+ * @return {number} The distance between {@code coord} and the nearest
+ *     corner/side of {@code box}, or zero if {@code coord} is inside
+ *     {@code box}.
+ */
+goog.math.Box.distance = function(box, coord) {
+  var x = goog.math.Box.relativePositionX(box, coord);
+  var y = goog.math.Box.relativePositionY(box, coord);
+  return Math.sqrt(x * x + y * y);
+};
+
+
+/**
+ * Returns whether two boxes intersect.
+ *
+ * @param {goog.math.Box} a A Box.
+ * @param {goog.math.Box} b A second Box.
+ * @return {boolean} Whether the boxes intersect.
+ */
+goog.math.Box.intersects = function(a, b) {
+  return (a.left <= b.right && b.left <= a.right &&
+          a.top <= b.bottom && b.top <= a.bottom);
+};
+
+
+/**
+ * Returns whether two boxes would intersect with additional padding.
+ *
+ * @param {goog.math.Box} a A Box.
+ * @param {goog.math.Box} b A second Box.
+ * @param {number} padding The additional padding.
+ * @return {boolean} Whether the boxes intersect.
+ */
+goog.math.Box.intersectsWithPadding = function(a, b, padding) {
+  return (a.left <= b.right + padding && b.left <= a.right + padding &&
+          a.top <= b.bottom + padding && b.top <= a.bottom + padding);
+};
+
+
+/**
+ * Rounds the fields to the next larger integer values.
+ *
+ * @return {!goog.math.Box} This box with ceil'd fields.
+ */
+goog.math.Box.prototype.ceil = function() {
+  this.top = Math.ceil(this.top);
+  this.right = Math.ceil(this.right);
+  this.bottom = Math.ceil(this.bottom);
+  this.left = Math.ceil(this.left);
+  return this;
+};
+
+
+/**
+ * Rounds the fields to the next smaller integer values.
+ *
+ * @return {!goog.math.Box} This box with floored fields.
+ */
+goog.math.Box.prototype.floor = function() {
+  this.top = Math.floor(this.top);
+  this.right = Math.floor(this.right);
+  this.bottom = Math.floor(this.bottom);
+  this.left = Math.floor(this.left);
+  return this;
+};
+
+
+/**
+ * Rounds the fields to nearest integer values.
+ *
+ * @return {!goog.math.Box} This box with rounded fields.
+ */
+goog.math.Box.prototype.round = function() {
+  this.top = Math.round(this.top);
+  this.right = Math.round(this.right);
+  this.bottom = Math.round(this.bottom);
+  this.left = Math.round(this.left);
+  return this;
+};
+
+
+/**
+ * Translates this box by the given offsets. If a {@code goog.math.Coordinate}
+ * is given, then the left and right values are translated by the coordinate's
+ * x value and the top and bottom values are translated by the coordinate's y
+ * value.  Otherwise, {@code tx} and {@code opt_ty} are used to translate the x
+ * and y dimension values.
+ *
+ * @param {number|goog.math.Coordinate} tx The value to translate the x
+ *     dimension values by or the the coordinate to translate this box by.
+ * @param {number=} opt_ty The value to translate y dimension values by.
+ * @return {!goog.math.Box} This box after translating.
+ */
+goog.math.Box.prototype.translate = function(tx, opt_ty) {
+  if (tx instanceof goog.math.Coordinate) {
+    this.left += tx.x;
+    this.right += tx.x;
+    this.top += tx.y;
+    this.bottom += tx.y;
+  } else {
+    this.left += tx;
+    this.right += tx;
+    if (goog.isNumber(opt_ty)) {
+      this.top += opt_ty;
+      this.bottom += opt_ty;
+    }
+  }
+  return this;
+};
+
+
+/**
+ * Scales this coordinate by the given scale factors. The x and y dimension
+ * values are scaled by {@code sx} and {@code opt_sy} respectively.
+ * If {@code opt_sy} is not given, then {@code sx} is used for both x and y.
+ *
+ * @param {number} sx The scale factor to use for the x dimension.
+ * @param {number=} opt_sy The scale factor to use for the y dimension.
+ * @return {!goog.math.Box} This box after scaling.
+ */
+goog.math.Box.prototype.scale = function(sx, opt_sy) {
+  var sy = goog.isNumber(opt_sy) ? opt_sy : sx;
+  this.left *= sx;
+  this.right *= sx;
+  this.top *= sy;
+  this.bottom *= sy;
+  return this;
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview A utility class for representing rectangles.
+ */
+
+goog.provide('goog.math.Rect');
+
+goog.require('goog.math.Box');
+goog.require('goog.math.Coordinate');
+goog.require('goog.math.Size');
+
+
+
+/**
+ * Class for representing rectangular regions.
+ * @param {number} x Left.
+ * @param {number} y Top.
+ * @param {number} w Width.
+ * @param {number} h Height.
+ * @struct
+ * @constructor
+ */
+goog.math.Rect = function(x, y, w, h) {
+  /** @type {number} */
+  this.left = x;
+
+  /** @type {number} */
+  this.top = y;
+
+  /** @type {number} */
+  this.width = w;
+
+  /** @type {number} */
+  this.height = h;
+};
+
+
+/**
+ * @return {!goog.math.Rect} A new copy of this Rectangle.
+ */
+goog.math.Rect.prototype.clone = function() {
+  return new goog.math.Rect(this.left, this.top, this.width, this.height);
+};
+
+
+/**
+ * Returns a new Box object with the same position and dimensions as this
+ * rectangle.
+ * @return {!goog.math.Box} A new Box representation of this Rectangle.
+ */
+goog.math.Rect.prototype.toBox = function() {
+  var right = this.left + this.width;
+  var bottom = this.top + this.height;
+  return new goog.math.Box(this.top,
+                           right,
+                           bottom,
+                           this.left);
+};
+
+
+/**
+ * Creates a new Rect object with the position and size given.
+ * @param {!goog.math.Coordinate} position The top-left coordinate of the Rect
+ * @param {!goog.math.Size} size The size of the Rect
+ * @return {!goog.math.Rect} A new Rect initialized with the given position and
+ *     size.
+ */
+goog.math.Rect.createFromPositionAndSize = function(position, size) {
+  return new goog.math.Rect(position.x, position.y, size.width, size.height);
+};
+
+
+/**
+ * Creates a new Rect object with the same position and dimensions as a given
+ * Box.  Note that this is only the inverse of toBox if left/top are defined.
+ * @param {goog.math.Box} box A box.
+ * @return {!goog.math.Rect} A new Rect initialized with the box's position
+ *     and size.
+ */
+goog.math.Rect.createFromBox = function(box) {
+  return new goog.math.Rect(box.left, box.top,
+      box.right - box.left, box.bottom - box.top);
+};
+
+
+if (goog.DEBUG) {
+  /**
+   * Returns a nice string representing size and dimensions of rectangle.
+   * @return {string} In the form (50, 73 - 75w x 25h).
+   * @override
+   */
+  goog.math.Rect.prototype.toString = function() {
+    return '(' + this.left + ', ' + this.top + ' - ' + this.width + 'w x ' +
+           this.height + 'h)';
+  };
+}
+
+
+/**
+ * Compares rectangles for equality.
+ * @param {goog.math.Rect} a A Rectangle.
+ * @param {goog.math.Rect} b A Rectangle.
+ * @return {boolean} True iff the rectangles have the same left, top, width,
+ *     and height, or if both are null.
+ */
+goog.math.Rect.equals = function(a, b) {
+  if (a == b) {
+    return true;
+  }
+  if (!a || !b) {
+    return false;
+  }
+  return a.left == b.left && a.width == b.width &&
+         a.top == b.top && a.height == b.height;
+};
+
+
+/**
+ * Computes the intersection of this rectangle and the rectangle parameter.  If
+ * there is no intersection, returns false and leaves this rectangle as is.
+ * @param {goog.math.Rect} rect A Rectangle.
+ * @return {boolean} True iff this rectangle intersects with the parameter.
+ */
+goog.math.Rect.prototype.intersection = function(rect) {
+  var x0 = Math.max(this.left, rect.left);
+  var x1 = Math.min(this.left + this.width, rect.left + rect.width);
+
+  if (x0 <= x1) {
+    var y0 = Math.max(this.top, rect.top);
+    var y1 = Math.min(this.top + this.height, rect.top + rect.height);
+
+    if (y0 <= y1) {
+      this.left = x0;
+      this.top = y0;
+      this.width = x1 - x0;
+      this.height = y1 - y0;
+
+      return true;
+    }
+  }
+  return false;
+};
+
+
+/**
+ * Returns the intersection of two rectangles. Two rectangles intersect if they
+ * touch at all, for example, two zero width and height rectangles would
+ * intersect if they had the same top and left.
+ * @param {goog.math.Rect} a A Rectangle.
+ * @param {goog.math.Rect} b A Rectangle.
+ * @return {goog.math.Rect} A new intersection rect (even if width and height
+ *     are 0), or null if there is no intersection.
+ */
+goog.math.Rect.intersection = function(a, b) {
+  // There is no nice way to do intersection via a clone, because any such
+  // clone might be unnecessary if this function returns null.  So, we duplicate
+  // code from above.
+
+  var x0 = Math.max(a.left, b.left);
+  var x1 = Math.min(a.left + a.width, b.left + b.width);
+
+  if (x0 <= x1) {
+    var y0 = Math.max(a.top, b.top);
+    var y1 = Math.min(a.top + a.height, b.top + b.height);
+
+    if (y0 <= y1) {
+      return new goog.math.Rect(x0, y0, x1 - x0, y1 - y0);
+    }
+  }
+  return null;
+};
+
+
+/**
+ * Returns whether two rectangles intersect. Two rectangles intersect if they
+ * touch at all, for example, two zero width and height rectangles would
+ * intersect if they had the same top and left.
+ * @param {goog.math.Rect} a A Rectangle.
+ * @param {goog.math.Rect} b A Rectangle.
+ * @return {boolean} Whether a and b intersect.
+ */
+goog.math.Rect.intersects = function(a, b) {
+  return (a.left <= b.left + b.width && b.left <= a.left + a.width &&
+      a.top <= b.top + b.height && b.top <= a.top + a.height);
+};
+
+
+/**
+ * Returns whether a rectangle intersects this rectangle.
+ * @param {goog.math.Rect} rect A rectangle.
+ * @return {boolean} Whether rect intersects this rectangle.
+ */
+goog.math.Rect.prototype.intersects = function(rect) {
+  return goog.math.Rect.intersects(this, rect);
+};
+
+
+/**
+ * Computes the difference regions between two rectangles. The return value is
+ * an array of 0 to 4 rectangles defining the remaining regions of the first
+ * rectangle after the second has been subtracted.
+ * @param {goog.math.Rect} a A Rectangle.
+ * @param {goog.math.Rect} b A Rectangle.
+ * @return {!Array<!goog.math.Rect>} An array with 0 to 4 rectangles which
+ *     together define the difference area of rectangle a minus rectangle b.
+ */
+goog.math.Rect.difference = function(a, b) {
+  var intersection = goog.math.Rect.intersection(a, b);
+  if (!intersection || !intersection.height || !intersection.width) {
+    return [a.clone()];
+  }
+
+  var result = [];
+
+  var top = a.top;
+  var height = a.height;
+
+  var ar = a.left + a.width;
+  var ab = a.top + a.height;
+
+  var br = b.left + b.width;
+  var bb = b.top + b.height;
+
+  // Subtract off any area on top where A extends past B
+  if (b.top > a.top) {
+    result.push(new goog.math.Rect(a.left, a.top, a.width, b.top - a.top));
+    top = b.top;
+    // If we're moving the top down, we also need to subtract the height diff.
+    height -= b.top - a.top;
+  }
+  // Subtract off any area on bottom where A extends past B
+  if (bb < ab) {
+    result.push(new goog.math.Rect(a.left, bb, a.width, ab - bb));
+    height = bb - top;
+  }
+  // Subtract any area on left where A extends past B
+  if (b.left > a.left) {
+    result.push(new goog.math.Rect(a.left, top, b.left - a.left, height));
+  }
+  // Subtract any area on right where A extends past B
+  if (br < ar) {
+    result.push(new goog.math.Rect(br, top, ar - br, height));
+  }
+
+  return result;
+};
+
+
+/**
+ * Computes the difference regions between this rectangle and {@code rect}. The
+ * return value is an array of 0 to 4 rectangles defining the remaining regions
+ * of this rectangle after the other has been subtracted.
+ * @param {goog.math.Rect} rect A Rectangle.
+ * @return {!Array<!goog.math.Rect>} An array with 0 to 4 rectangles which
+ *     together define the difference area of rectangle a minus rectangle b.
+ */
+goog.math.Rect.prototype.difference = function(rect) {
+  return goog.math.Rect.difference(this, rect);
+};
+
+
+/**
+ * Expand this rectangle to also include the area of the given rectangle.
+ * @param {goog.math.Rect} rect The other rectangle.
+ */
+goog.math.Rect.prototype.boundingRect = function(rect) {
+  // We compute right and bottom before we change left and top below.
+  var right = Math.max(this.left + this.width, rect.left + rect.width);
+  var bottom = Math.max(this.top + this.height, rect.top + rect.height);
+
+  this.left = Math.min(this.left, rect.left);
+  this.top = Math.min(this.top, rect.top);
+
+  this.width = right - this.left;
+  this.height = bottom - this.top;
+};
+
+
+/**
+ * Returns a new rectangle which completely contains both input rectangles.
+ * @param {goog.math.Rect} a A rectangle.
+ * @param {goog.math.Rect} b A rectangle.
+ * @return {goog.math.Rect} A new bounding rect, or null if either rect is
+ *     null.
+ */
+goog.math.Rect.boundingRect = function(a, b) {
+  if (!a || !b) {
+    return null;
+  }
+
+  var clone = a.clone();
+  clone.boundingRect(b);
+
+  return clone;
+};
+
+
+/**
+ * Tests whether this rectangle entirely contains another rectangle or
+ * coordinate.
+ *
+ * @param {goog.math.Rect|goog.math.Coordinate} another The rectangle or
+ *     coordinate to test for containment.
+ * @return {boolean} Whether this rectangle contains given rectangle or
+ *     coordinate.
+ */
+goog.math.Rect.prototype.contains = function(another) {
+  if (another instanceof goog.math.Rect) {
+    return this.left <= another.left &&
+           this.left + this.width >= another.left + another.width &&
+           this.top <= another.top &&
+           this.top + this.height >= another.top + another.height;
+  } else { // (another instanceof goog.math.Coordinate)
+    return another.x >= this.left &&
+           another.x <= this.left + this.width &&
+           another.y >= this.top &&
+           another.y <= this.top + this.height;
+  }
+};
+
+
+/**
+ * @param {!goog.math.Coordinate} point A coordinate.
+ * @return {number} The squared distance between the point and the closest
+ *     point inside the rectangle. Returns 0 if the point is inside the
+ *     rectangle.
+ */
+goog.math.Rect.prototype.squaredDistance = function(point) {
+  var dx = point.x < this.left ?
+      this.left - point.x : Math.max(point.x - (this.left + this.width), 0);
+  var dy = point.y < this.top ?
+      this.top - point.y : Math.max(point.y - (this.top + this.height), 0);
+  return dx * dx + dy * dy;
+};
+
+
+/**
+ * @param {!goog.math.Coordinate} point A coordinate.
+ * @return {number} The distance between the point and the closest point
+ *     inside the rectangle. Returns 0 if the point is inside the rectangle.
+ */
+goog.math.Rect.prototype.distance = function(point) {
+  return Math.sqrt(this.squaredDistance(point));
+};
+
+
+/**
+ * @return {!goog.math.Size} The size of this rectangle.
+ */
+goog.math.Rect.prototype.getSize = function() {
+  return new goog.math.Size(this.width, this.height);
+};
+
+
+/**
+ * @return {!goog.math.Coordinate} A new coordinate for the top-left corner of
+ *     the rectangle.
+ */
+goog.math.Rect.prototype.getTopLeft = function() {
+  return new goog.math.Coordinate(this.left, this.top);
+};
+
+
+/**
+ * @return {!goog.math.Coordinate} A new coordinate for the center of the
+ *     rectangle.
+ */
+goog.math.Rect.prototype.getCenter = function() {
+  return new goog.math.Coordinate(
+      this.left + this.width / 2, this.top + this.height / 2);
+};
+
+
+/**
+ * @return {!goog.math.Coordinate} A new coordinate for the bottom-right corner
+ *     of the rectangle.
+ */
+goog.math.Rect.prototype.getBottomRight = function() {
+  return new goog.math.Coordinate(
+      this.left + this.width, this.top + this.height);
+};
+
+
+/**
+ * Rounds the fields to the next larger integer values.
+ * @return {!goog.math.Rect} This rectangle with ceil'd fields.
+ */
+goog.math.Rect.prototype.ceil = function() {
+  this.left = Math.ceil(this.left);
+  this.top = Math.ceil(this.top);
+  this.width = Math.ceil(this.width);
+  this.height = Math.ceil(this.height);
+  return this;
+};
+
+
+/**
+ * Rounds the fields to the next smaller integer values.
+ * @return {!goog.math.Rect} This rectangle with floored fields.
+ */
+goog.math.Rect.prototype.floor = function() {
+  this.left = Math.floor(this.left);
+  this.top = Math.floor(this.top);
+  this.width = Math.floor(this.width);
+  this.height = Math.floor(this.height);
+  return this;
+};
+
+
+/**
+ * Rounds the fields to nearest integer values.
+ * @return {!goog.math.Rect} This rectangle with rounded fields.
+ */
+goog.math.Rect.prototype.round = function() {
+  this.left = Math.round(this.left);
+  this.top = Math.round(this.top);
+  this.width = Math.round(this.width);
+  this.height = Math.round(this.height);
+  return this;
+};
+
+
+/**
+ * Translates this rectangle by the given offsets. If a
+ * {@code goog.math.Coordinate} is given, then the left and top values are
+ * translated by the coordinate's x and y values. Otherwise, top and left are
+ * translated by {@code tx} and {@code opt_ty} respectively.
+ * @param {number|goog.math.Coordinate} tx The value to translate left by or the
+ *     the coordinate to translate this rect by.
+ * @param {number=} opt_ty The value to translate top by.
+ * @return {!goog.math.Rect} This rectangle after translating.
+ */
+goog.math.Rect.prototype.translate = function(tx, opt_ty) {
+  if (tx instanceof goog.math.Coordinate) {
+    this.left += tx.x;
+    this.top += tx.y;
+  } else {
+    this.left += tx;
+    if (goog.isNumber(opt_ty)) {
+      this.top += opt_ty;
+    }
+  }
+  return this;
+};
+
+
+/**
+ * Scales this rectangle by the given scale factors. The left and width values
+ * are scaled by {@code sx} and the top and height values are scaled by
+ * {@code opt_sy}.  If {@code opt_sy} is not given, then all fields are scaled
+ * by {@code sx}.
+ * @param {number} sx The scale factor to use for the x dimension.
+ * @param {number=} opt_sy The scale factor to use for the y dimension.
+ * @return {!goog.math.Rect} This rectangle after scaling.
+ */
+goog.math.Rect.prototype.scale = function(sx, opt_sy) {
+  var sy = goog.isNumber(opt_sy) ? opt_sy : sx;
+  this.left *= sx;
+  this.width *= sx;
+  this.top *= sy;
+  this.height *= sy;
+  return this;
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Utilities for element styles.
+ *
+ * @author arv@google.com (Erik Arvidsson)
+ * @author eae@google.com (Emil A Eklund)
+ * @see ../demos/inline_block_quirks.html
+ * @see ../demos/inline_block_standards.html
+ * @see ../demos/style_viewport.html
+ */
+
+goog.provide('goog.style');
+
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.dom');
+goog.require('goog.dom.NodeType');
+goog.require('goog.dom.TagName');
+goog.require('goog.dom.vendor');
+goog.require('goog.math.Box');
+goog.require('goog.math.Coordinate');
+goog.require('goog.math.Rect');
+goog.require('goog.math.Size');
+goog.require('goog.object');
+goog.require('goog.string');
+goog.require('goog.userAgent');
+
+goog.forwardDeclare('goog.events.BrowserEvent');
+goog.forwardDeclare('goog.events.Event');
+
+
+/**
+ * Sets a style value on an element.
+ *
+ * This function is not indended to patch issues in the browser's style
+ * handling, but to allow easy programmatic access to setting dash-separated
+ * style properties.  An example is setting a batch of properties from a data
+ * object without overwriting old styles.  When possible, use native APIs:
+ * elem.style.propertyKey = 'value' or (if obliterating old styles is fine)
+ * elem.style.cssText = 'property1: value1; property2: value2'.
+ *
+ * @param {Element} element The element to change.
+ * @param {string|Object} style If a string, a style name. If an object, a hash
+ *     of style names to style values.
+ * @param {string|number|boolean=} opt_value If style was a string, then this
+ *     should be the value.
+ */
+goog.style.setStyle = function(element, style, opt_value) {
+  if (goog.isString(style)) {
+    goog.style.setStyle_(element, opt_value, style);
+  } else {
+    for (var key in style) {
+      goog.style.setStyle_(element, style[key], key);
+    }
+  }
+};
+
+
+/**
+ * Sets a style value on an element, with parameters swapped to work with
+ * {@code goog.object.forEach()}. Prepends a vendor-specific prefix when
+ * necessary.
+ * @param {Element} element The element to change.
+ * @param {string|number|boolean|undefined} value Style value.
+ * @param {string} style Style name.
+ * @private
+ */
+goog.style.setStyle_ = function(element, value, style) {
+  var propertyName = goog.style.getVendorJsStyleName_(element, style);
+
+  if (propertyName) {
+    element.style[propertyName] = value;
+  }
+};
+
+
+/**
+ * Style name cache that stores previous property name lookups.
+ *
+ * This is used by setStyle to speed up property lookups, entries look like:
+ *   { StyleName: ActualPropertyName }
+ *
+ * @private {!Object<string, string>}
+ */
+goog.style.styleNameCache_ = {};
+
+
+/**
+ * Returns the style property name in camel-case. If it does not exist and a
+ * vendor-specific version of the property does exist, then return the vendor-
+ * specific property name instead.
+ * @param {Element} element The element to change.
+ * @param {string} style Style name.
+ * @return {string} Vendor-specific style.
+ * @private
+ */
+goog.style.getVendorJsStyleName_ = function(element, style) {
+  var propertyName = goog.style.styleNameCache_[style];
+  if (!propertyName) {
+    var camelStyle = goog.string.toCamelCase(style);
+    propertyName = camelStyle;
+
+    if (element.style[camelStyle] === undefined) {
+      var prefixedStyle = goog.dom.vendor.getVendorJsPrefix() +
+          goog.string.toTitleCase(camelStyle);
+
+      if (element.style[prefixedStyle] !== undefined) {
+        propertyName = prefixedStyle;
+      }
+    }
+    goog.style.styleNameCache_[style] = propertyName;
+  }
+
+  return propertyName;
+};
+
+
+/**
+ * Returns the style property name in CSS notation. If it does not exist and a
+ * vendor-specific version of the property does exist, then return the vendor-
+ * specific property name instead.
+ * @param {Element} element The element to change.
+ * @param {string} style Style name.
+ * @return {string} Vendor-specific style.
+ * @private
+ */
+goog.style.getVendorStyleName_ = function(element, style) {
+  var camelStyle = goog.string.toCamelCase(style);
+
+  if (element.style[camelStyle] === undefined) {
+    var prefixedStyle = goog.dom.vendor.getVendorJsPrefix() +
+        goog.string.toTitleCase(camelStyle);
+
+    if (element.style[prefixedStyle] !== undefined) {
+      return goog.dom.vendor.getVendorPrefix() + '-' + style;
+    }
+  }
+
+  return style;
+};
+
+
+/**
+ * Retrieves an explicitly-set style value of a node. This returns '' if there
+ * isn't a style attribute on the element or if this style property has not been
+ * explicitly set in script.
+ *
+ * @param {Element} element Element to get style of.
+ * @param {string} property Property to get, css-style (if you have a camel-case
+ * property, use element.style[style]).
+ * @return {string} Style value.
+ */
+goog.style.getStyle = function(element, property) {
+  // element.style is '' for well-known properties which are unset.
+  // For for browser specific styles as 'filter' is undefined
+  // so we need to return '' explicitly to make it consistent across
+  // browsers.
+  var styleValue = element.style[goog.string.toCamelCase(property)];
+
+  // Using typeof here because of a bug in Safari 5.1, where this value
+  // was undefined, but === undefined returned false.
+  if (typeof(styleValue) !== 'undefined') {
+    return styleValue;
+  }
+
+  return element.style[goog.style.getVendorJsStyleName_(element, property)] ||
+      '';
+};
+
+
+/**
+ * Retrieves a computed style value of a node. It returns empty string if the
+ * value cannot be computed (which will be the case in Internet Explorer) or
+ * "none" if the property requested is an SVG one and it has not been
+ * explicitly set (firefox and webkit).
+ *
+ * @param {Element} element Element to get style of.
+ * @param {string} property Property to get (camel-case).
+ * @return {string} Style value.
+ */
+goog.style.getComputedStyle = function(element, property) {
+  var doc = goog.dom.getOwnerDocument(element);
+  if (doc.defaultView && doc.defaultView.getComputedStyle) {
+    var styles = doc.defaultView.getComputedStyle(element, null);
+    if (styles) {
+      // element.style[..] is undefined for browser specific styles
+      // as 'filter'.
+      return styles[property] || styles.getPropertyValue(property) || '';
+    }
+  }
+
+  return '';
+};
+
+
+/**
+ * Gets the cascaded style value of a node, or null if the value cannot be
+ * computed (only Internet Explorer can do this).
+ *
+ * @param {Element} element Element to get style of.
+ * @param {string} style Property to get (camel-case).
+ * @return {string} Style value.
+ */
+goog.style.getCascadedStyle = function(element, style) {
+  // TODO(nicksantos): This should be documented to return null. #fixTypes
+  return element.currentStyle ? element.currentStyle[style] : null;
+};
+
+
+/**
+ * Cross-browser pseudo get computed style. It returns the computed style where
+ * available. If not available it tries the cascaded style value (IE
+ * currentStyle) and in worst case the inline style value.  It shouldn't be
+ * called directly, see http://wiki/Main/ComputedStyleVsCascadedStyle for
+ * discussion.
+ *
+ * @param {Element} element Element to get style of.
+ * @param {string} style Property to get (must be camelCase, not css-style.).
+ * @return {string} Style value.
+ * @private
+ */
+goog.style.getStyle_ = function(element, style) {
+  return goog.style.getComputedStyle(element, style) ||
+         goog.style.getCascadedStyle(element, style) ||
+         (element.style && element.style[style]);
+};
+
+
+/**
+ * Retrieves the computed value of the box-sizing CSS attribute.
+ * Browser support: http://caniuse.com/css3-boxsizing.
+ * @param {!Element} element The element whose box-sizing to get.
+ * @return {?string} 'content-box', 'border-box' or 'padding-box'. null if
+ *     box-sizing is not supported (IE7 and below).
+ */
+goog.style.getComputedBoxSizing = function(element) {
+  return goog.style.getStyle_(element, 'boxSizing') ||
+      goog.style.getStyle_(element, 'MozBoxSizing') ||
+      goog.style.getStyle_(element, 'WebkitBoxSizing') || null;
+};
+
+
+/**
+ * Retrieves the computed value of the position CSS attribute.
+ * @param {Element} element The element to get the position of.
+ * @return {string} Position value.
+ */
+goog.style.getComputedPosition = function(element) {
+  return goog.style.getStyle_(element, 'position');
+};
+
+
+/**
+ * Retrieves the computed background color string for a given element. The
+ * string returned is suitable for assigning to another element's
+ * background-color, but is not guaranteed to be in any particular string
+ * format. Accessing the color in a numeric form may not be possible in all
+ * browsers or with all input.
+ *
+ * If the background color for the element is defined as a hexadecimal value,
+ * the resulting string can be parsed by goog.color.parse in all supported
+ * browsers.
+ *
+ * Whether named colors like "red" or "lightblue" get translated into a
+ * format which can be parsed is browser dependent. Calling this function on
+ * transparent elements will return "transparent" in most browsers or
+ * "rgba(0, 0, 0, 0)" in WebKit.
+ * @param {Element} element The element to get the background color of.
+ * @return {string} The computed string value of the background color.
+ */
+goog.style.getBackgroundColor = function(element) {
+  return goog.style.getStyle_(element, 'backgroundColor');
+};
+
+
+/**
+ * Retrieves the computed value of the overflow-x CSS attribute.
+ * @param {Element} element The element to get the overflow-x of.
+ * @return {string} The computed string value of the overflow-x attribute.
+ */
+goog.style.getComputedOverflowX = function(element) {
+  return goog.style.getStyle_(element, 'overflowX');
+};
+
+
+/**
+ * Retrieves the computed value of the overflow-y CSS attribute.
+ * @param {Element} element The element to get the overflow-y of.
+ * @return {string} The computed string value of the overflow-y attribute.
+ */
+goog.style.getComputedOverflowY = function(element) {
+  return goog.style.getStyle_(element, 'overflowY');
+};
+
+
+/**
+ * Retrieves the computed value of the z-index CSS attribute.
+ * @param {Element} element The element to get the z-index of.
+ * @return {string|number} The computed value of the z-index attribute.
+ */
+goog.style.getComputedZIndex = function(element) {
+  return goog.style.getStyle_(element, 'zIndex');
+};
+
+
+/**
+ * Retrieves the computed value of the text-align CSS attribute.
+ * @param {Element} element The element to get the text-align of.
+ * @return {string} The computed string value of the text-align attribute.
+ */
+goog.style.getComputedTextAlign = function(element) {
+  return goog.style.getStyle_(element, 'textAlign');
+};
+
+
+/**
+ * Retrieves the computed value of the cursor CSS attribute.
+ * @param {Element} element The element to get the cursor of.
+ * @return {string} The computed string value of the cursor attribute.
+ */
+goog.style.getComputedCursor = function(element) {
+  return goog.style.getStyle_(element, 'cursor');
+};
+
+
+/**
+ * Retrieves the computed value of the CSS transform attribute.
+ * @param {Element} element The element to get the transform of.
+ * @return {string} The computed string representation of the transform matrix.
+ */
+goog.style.getComputedTransform = function(element) {
+  var property = goog.style.getVendorStyleName_(element, 'transform');
+  return goog.style.getStyle_(element, property) ||
+      goog.style.getStyle_(element, 'transform');
+};
+
+
+/**
+ * Sets the top/left values of an element.  If no unit is specified in the
+ * argument then it will add px. The second argument is required if the first
+ * argument is a string or number and is ignored if the first argument
+ * is a coordinate.
+ * @param {Element} el Element to move.
+ * @param {string|number|goog.math.Coordinate} arg1 Left position or coordinate.
+ * @param {string|number=} opt_arg2 Top position.
+ */
+goog.style.setPosition = function(el, arg1, opt_arg2) {
+  var x, y;
+
+  if (arg1 instanceof goog.math.Coordinate) {
+    x = arg1.x;
+    y = arg1.y;
+  } else {
+    x = arg1;
+    y = opt_arg2;
+  }
+
+  el.style.left = goog.style.getPixelStyleValue_(
+      /** @type {number|string} */ (x), false);
+  el.style.top = goog.style.getPixelStyleValue_(
+      /** @type {number|string} */ (y), false);
+};
+
+
+/**
+ * Gets the offsetLeft and offsetTop properties of an element and returns them
+ * in a Coordinate object
+ * @param {Element} element Element.
+ * @return {!goog.math.Coordinate} The position.
+ */
+goog.style.getPosition = function(element) {
+  return new goog.math.Coordinate(
+      /** @type {!HTMLElement} */ (element).offsetLeft,
+      /** @type {!HTMLElement} */ (element).offsetTop);
+};
+
+
+/**
+ * Returns the viewport element for a particular document
+ * @param {Node=} opt_node DOM node (Document is OK) to get the viewport element
+ *     of.
+ * @return {Element} document.documentElement or document.body.
+ */
+goog.style.getClientViewportElement = function(opt_node) {
+  var doc;
+  if (opt_node) {
+    doc = goog.dom.getOwnerDocument(opt_node);
+  } else {
+    doc = goog.dom.getDocument();
+  }
+
+  // In old IE versions the document.body represented the viewport
+  if (goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(9) &&
+      !goog.dom.getDomHelper(doc).isCss1CompatMode()) {
+    return doc.body;
+  }
+  return doc.documentElement;
+};
+
+
+/**
+ * Calculates the viewport coordinates relative to the page/document
+ * containing the node. The viewport may be the browser viewport for
+ * non-iframe document, or the iframe container for iframe'd document.
+ * @param {!Document} doc The document to use as the reference point.
+ * @return {!goog.math.Coordinate} The page offset of the viewport.
+ */
+goog.style.getViewportPageOffset = function(doc) {
+  var body = doc.body;
+  var documentElement = doc.documentElement;
+  var scrollLeft = body.scrollLeft || documentElement.scrollLeft;
+  var scrollTop = body.scrollTop || documentElement.scrollTop;
+  return new goog.math.Coordinate(scrollLeft, scrollTop);
+};
+
+
+/**
+ * Gets the client rectangle of the DOM element.
+ *
+ * getBoundingClientRect is part of a new CSS object model draft (with a
+ * long-time presence in IE), replacing the error-prone parent offset
+ * computation and the now-deprecated Gecko getBoxObjectFor.
+ *
+ * This utility patches common browser bugs in getBoundingClientRect. It
+ * will fail if getBoundingClientRect is unsupported.
+ *
+ * If the element is not in the DOM, the result is undefined, and an error may
+ * be thrown depending on user agent.
+ *
+ * @param {!Element} el The element whose bounding rectangle is being queried.
+ * @return {Object} A native bounding rectangle with numerical left, top,
+ *     right, and bottom.  Reported by Firefox to be of object type ClientRect.
+ * @private
+ */
+goog.style.getBoundingClientRect_ = function(el) {
+  var rect;
+  try {
+    rect = el.getBoundingClientRect();
+  } catch (e) {
+    // In IE < 9, calling getBoundingClientRect on an orphan element raises an
+    // "Unspecified Error". All other browsers return zeros.
+    return {'left': 0, 'top': 0, 'right': 0, 'bottom': 0};
+  }
+
+  // Patch the result in IE only, so that this function can be inlined if
+  // compiled for non-IE.
+  if (goog.userAgent.IE && el.ownerDocument.body) {
+
+    // In IE, most of the time, 2 extra pixels are added to the top and left
+    // due to the implicit 2-pixel inset border.  In IE6/7 quirks mode and
+    // IE6 standards mode, this border can be overridden by setting the
+    // document element's border to zero -- thus, we cannot rely on the
+    // offset always being 2 pixels.
+
+    // In quirks mode, the offset can be determined by querying the body's
+    // clientLeft/clientTop, but in standards mode, it is found by querying
+    // the document element's clientLeft/clientTop.  Since we already called
+    // getBoundingClientRect we have already forced a reflow, so it is not
+    // too expensive just to query them all.
+
+    // See: http://msdn.microsoft.com/en-us/library/ms536433(VS.85).aspx
+    var doc = el.ownerDocument;
+    rect.left -= doc.documentElement.clientLeft + doc.body.clientLeft;
+    rect.top -= doc.documentElement.clientTop + doc.body.clientTop;
+  }
+  return rect;
+};
+
+
+/**
+ * Returns the first parent that could affect the position of a given element.
+ * @param {Element} element The element to get the offset parent for.
+ * @return {Element} The first offset parent or null if one cannot be found.
+ */
+goog.style.getOffsetParent = function(element) {
+  // element.offsetParent does the right thing in IE7 and below.  In other
+  // browsers it only includes elements with position absolute, relative or
+  // fixed, not elements with overflow set to auto or scroll.
+  if (goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(8)) {
+    return element.offsetParent;
+  }
+
+  var doc = goog.dom.getOwnerDocument(element);
+  var positionStyle = goog.style.getStyle_(element, 'position');
+  var skipStatic = positionStyle == 'fixed' || positionStyle == 'absolute';
+  for (var parent = element.parentNode; parent && parent != doc;
+       parent = parent.parentNode) {
+    // Skip shadowDOM roots.
+    if (parent.nodeType == goog.dom.NodeType.DOCUMENT_FRAGMENT &&
+        parent.host) {
+      parent = parent.host;
+    }
+    positionStyle =
+        goog.style.getStyle_(/** @type {!Element} */ (parent), 'position');
+    skipStatic = skipStatic && positionStyle == 'static' &&
+                 parent != doc.documentElement && parent != doc.body;
+    if (!skipStatic && (parent.scrollWidth > parent.clientWidth ||
+                        parent.scrollHeight > parent.clientHeight ||
+                        positionStyle == 'fixed' ||
+                        positionStyle == 'absolute' ||
+                        positionStyle == 'relative')) {
+      return /** @type {!Element} */ (parent);
+    }
+  }
+  return null;
+};
+
+
+/**
+ * Calculates and returns the visible rectangle for a given element. Returns a
+ * box describing the visible portion of the nearest scrollable offset ancestor.
+ * Coordinates are given relative to the document.
+ *
+ * @param {Element} element Element to get the visible rect for.
+ * @return {goog.math.Box} Bounding elementBox describing the visible rect or
+ *     null if scrollable ancestor isn't inside the visible viewport.
+ */
+goog.style.getVisibleRectForElement = function(element) {
+  var visibleRect = new goog.math.Box(0, Infinity, Infinity, 0);
+  var dom = goog.dom.getDomHelper(element);
+  var body = dom.getDocument().body;
+  var documentElement = dom.getDocument().documentElement;
+  var scrollEl = dom.getDocumentScrollElement();
+
+  // Determine the size of the visible rect by climbing the dom accounting for
+  // all scrollable containers.
+  for (var el = element; el = goog.style.getOffsetParent(el); ) {
+    // clientWidth is zero for inline block elements in IE.
+    // on WEBKIT, body element can have clientHeight = 0 and scrollHeight > 0
+    if ((!goog.userAgent.IE || el.clientWidth != 0) &&
+        (!goog.userAgent.WEBKIT || el.clientHeight != 0 || el != body) &&
+        // body may have overflow set on it, yet we still get the entire
+        // viewport. In some browsers, el.offsetParent may be
+        // document.documentElement, so check for that too.
+        (el != body && el != documentElement &&
+            goog.style.getStyle_(el, 'overflow') != 'visible')) {
+      var pos = goog.style.getPageOffset(el);
+      var client = goog.style.getClientLeftTop(el);
+      pos.x += client.x;
+      pos.y += client.y;
+
+      visibleRect.top = Math.max(visibleRect.top, pos.y);
+      visibleRect.right = Math.min(visibleRect.right,
+                                   pos.x + el.clientWidth);
+      visibleRect.bottom = Math.min(visibleRect.bottom,
+                                    pos.y + el.clientHeight);
+      visibleRect.left = Math.max(visibleRect.left, pos.x);
+    }
+  }
+
+  // Clip by window's viewport.
+  var scrollX = scrollEl.scrollLeft, scrollY = scrollEl.scrollTop;
+  visibleRect.left = Math.max(visibleRect.left, scrollX);
+  visibleRect.top = Math.max(visibleRect.top, scrollY);
+  var winSize = dom.getViewportSize();
+  visibleRect.right = Math.min(visibleRect.right, scrollX + winSize.width);
+  visibleRect.bottom = Math.min(visibleRect.bottom, scrollY + winSize.height);
+  return visibleRect.top >= 0 && visibleRect.left >= 0 &&
+         visibleRect.bottom > visibleRect.top &&
+         visibleRect.right > visibleRect.left ?
+         visibleRect : null;
+};
+
+
+/**
+ * Calculate the scroll position of {@code container} with the minimum amount so
+ * that the content and the borders of the given {@code element} become visible.
+ * If the element is bigger than the container, its top left corner will be
+ * aligned as close to the container's top left corner as possible.
+ *
+ * @param {Element} element The element to make visible.
+ * @param {Element=} opt_container The container to scroll. If not set, then the
+ *     document scroll element will be used.
+ * @param {boolean=} opt_center Whether to center the element in the container.
+ *     Defaults to false.
+ * @return {!goog.math.Coordinate} The new scroll position of the container,
+ *     in form of goog.math.Coordinate(scrollLeft, scrollTop).
+ */
+goog.style.getContainerOffsetToScrollInto =
+    function(element, opt_container, opt_center) {
+  var container = opt_container || goog.dom.getDocumentScrollElement();
+  // Absolute position of the element's border's top left corner.
+  var elementPos = goog.style.getPageOffset(element);
+  // Absolute position of the container's border's top left corner.
+  var containerPos = goog.style.getPageOffset(container);
+  var containerBorder = goog.style.getBorderBox(container);
+  if (container == goog.dom.getDocumentScrollElement()) {
+    // The element position is calculated based on the page offset, and the
+    // document scroll element holds the scroll position within the page. We can
+    // use the scroll position to calculate the relative position from the
+    // element.
+    var relX = elementPos.x - container.scrollLeft;
+    var relY = elementPos.y - container.scrollTop;
+    if (goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(10)) {
+      // In older versions of IE getPageOffset(element) does not include the
+      // container border so it has to be added to accomodate.
+      relX += containerBorder.left;
+      relY += containerBorder.top;
+    }
+  } else {
+    // Relative pos. of the element's border box to the container's content box.
+    var relX = elementPos.x - containerPos.x - containerBorder.left;
+    var relY = elementPos.y - containerPos.y - containerBorder.top;
+  }
+  // How much the element can move in the container, i.e. the difference between
+  // the element's bottom-right-most and top-left-most position where it's
+  // fully visible.
+  var spaceX = container.clientWidth -
+      /** @type {HTMLElement} */ (element).offsetWidth;
+  var spaceY = container.clientHeight -
+      /** @type {HTMLElement} */ (element).offsetHeight;
+
+  var scrollLeft = container.scrollLeft;
+  var scrollTop = container.scrollTop;
+  if (opt_center) {
+    // All browsers round non-integer scroll positions down.
+    scrollLeft += relX - spaceX / 2;
+    scrollTop += relY - spaceY / 2;
+  } else {
+    // This formula was designed to give the correct scroll values in the
+    // following cases:
+    // - element is higher than container (spaceY < 0) => scroll down by relY
+    // - element is not higher that container (spaceY >= 0):
+    //   - it is above container (relY < 0) => scroll up by abs(relY)
+    //   - it is below container (relY > spaceY) => scroll down by relY - spaceY
+    //   - it is in the container => don't scroll
+    scrollLeft += Math.min(relX, Math.max(relX - spaceX, 0));
+    scrollTop += Math.min(relY, Math.max(relY - spaceY, 0));
+  }
+  return new goog.math.Coordinate(scrollLeft, scrollTop);
+};
+
+
+/**
+ * Changes the scroll position of {@code container} with the minimum amount so
+ * that the content and the borders of the given {@code element} become visible.
+ * If the element is bigger than the container, its top left corner will be
+ * aligned as close to the container's top left corner as possible.
+ *
+ * @param {Element} element The element to make visible.
+ * @param {Element=} opt_container The container to scroll. If not set, then the
+ *     document scroll element will be used.
+ * @param {boolean=} opt_center Whether to center the element in the container.
+ *     Defaults to false.
+ */
+goog.style.scrollIntoContainerView =
+    function(element, opt_container, opt_center) {
+  var container = opt_container || goog.dom.getDocumentScrollElement();
+  var offset =
+      goog.style.getContainerOffsetToScrollInto(element, container, opt_center);
+  container.scrollLeft = offset.x;
+  container.scrollTop = offset.y;
+};
+
+
+/**
+ * Returns clientLeft (width of the left border and, if the directionality is
+ * right to left, the vertical scrollbar) and clientTop as a coordinate object.
+ *
+ * @param {Element} el Element to get clientLeft for.
+ * @return {!goog.math.Coordinate} Client left and top.
+ */
+goog.style.getClientLeftTop = function(el) {
+  return new goog.math.Coordinate(el.clientLeft, el.clientTop);
+};
+
+
+/**
+ * Returns a Coordinate object relative to the top-left of the HTML document.
+ * Implemented as a single function to save having to do two recursive loops in
+ * opera and safari just to get both coordinates.  If you just want one value do
+ * use goog.style.getPageOffsetLeft() and goog.style.getPageOffsetTop(), but
+ * note if you call both those methods the tree will be analysed twice.
+ *
+ * @param {Element} el Element to get the page offset for.
+ * @return {!goog.math.Coordinate} The page offset.
+ */
+goog.style.getPageOffset = function(el) {
+  var doc = goog.dom.getOwnerDocument(el);
+  // TODO(gboyer): Update the jsdoc in a way that doesn't break the universe.
+  goog.asserts.assertObject(el, 'Parameter is required');
+
+  // NOTE(arv): If element is hidden (display none or disconnected or any the
+  // ancestors are hidden) we get (0,0) by default but we still do the
+  // accumulation of scroll position.
+
+  // TODO(arv): Should we check if the node is disconnected and in that case
+  //            return (0,0)?
+
+  var pos = new goog.math.Coordinate(0, 0);
+  var viewportElement = goog.style.getClientViewportElement(doc);
+  if (el == viewportElement) {
+    // viewport is always at 0,0 as that defined the coordinate system for this
+    // function - this avoids special case checks in the code below
+    return pos;
+  }
+
+  var box = goog.style.getBoundingClientRect_(el);
+  // Must add the scroll coordinates in to get the absolute page offset
+  // of element since getBoundingClientRect returns relative coordinates to
+  // the viewport.
+  var scrollCoord = goog.dom.getDomHelper(doc).getDocumentScroll();
+  pos.x = box.left + scrollCoord.x;
+  pos.y = box.top + scrollCoord.y;
+
+  return pos;
+};
+
+
+/**
+ * Returns the left coordinate of an element relative to the HTML document
+ * @param {Element} el Elements.
+ * @return {number} The left coordinate.
+ */
+goog.style.getPageOffsetLeft = function(el) {
+  return goog.style.getPageOffset(el).x;
+};
+
+
+/**
+ * Returns the top coordinate of an element relative to the HTML document
+ * @param {Element} el Elements.
+ * @return {number} The top coordinate.
+ */
+goog.style.getPageOffsetTop = function(el) {
+  return goog.style.getPageOffset(el).y;
+};
+
+
+/**
+ * Returns a Coordinate object relative to the top-left of an HTML document
+ * in an ancestor frame of this element. Used for measuring the position of
+ * an element inside a frame relative to a containing frame.
+ *
+ * @param {Element} el Element to get the page offset for.
+ * @param {Window} relativeWin The window to measure relative to. If relativeWin
+ *     is not in the ancestor frame chain of the element, we measure relative to
+ *     the top-most window.
+ * @return {!goog.math.Coordinate} The page offset.
+ */
+goog.style.getFramedPageOffset = function(el, relativeWin) {
+  var position = new goog.math.Coordinate(0, 0);
+
+  // Iterate up the ancestor frame chain, keeping track of the current window
+  // and the current element in that window.
+  var currentWin = goog.dom.getWindow(goog.dom.getOwnerDocument(el));
+  var currentEl = el;
+  do {
+    // if we're at the top window, we want to get the page offset.
+    // if we're at an inner frame, we only want to get the window position
+    // so that we can determine the actual page offset in the context of
+    // the outer window.
+    var offset = currentWin == relativeWin ?
+        goog.style.getPageOffset(currentEl) :
+        goog.style.getClientPositionForElement_(
+            goog.asserts.assert(currentEl));
+
+    position.x += offset.x;
+    position.y += offset.y;
+  } while (currentWin && currentWin != relativeWin &&
+      currentWin != currentWin.parent &&
+      (currentEl = currentWin.frameElement) &&
+      (currentWin = currentWin.parent));
+
+  return position;
+};
+
+
+/**
+ * Translates the specified rect relative to origBase page, for newBase page.
+ * If origBase and newBase are the same, this function does nothing.
+ *
+ * @param {goog.math.Rect} rect The source rectangle relative to origBase page,
+ *     and it will have the translated result.
+ * @param {goog.dom.DomHelper} origBase The DomHelper for the input rectangle.
+ * @param {goog.dom.DomHelper} newBase The DomHelper for the resultant
+ *     coordinate.  This must be a DOM for an ancestor frame of origBase
+ *     or the same as origBase.
+ */
+goog.style.translateRectForAnotherFrame = function(rect, origBase, newBase) {
+  if (origBase.getDocument() != newBase.getDocument()) {
+    var body = origBase.getDocument().body;
+    var pos = goog.style.getFramedPageOffset(body, newBase.getWindow());
+
+    // Adjust Body's margin.
+    pos = goog.math.Coordinate.difference(pos, goog.style.getPageOffset(body));
+
+    if (goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(9) &&
+        !origBase.isCss1CompatMode()) {
+      pos = goog.math.Coordinate.difference(pos, origBase.getDocumentScroll());
+    }
+
+    rect.left += pos.x;
+    rect.top += pos.y;
+  }
+};
+
+
+/**
+ * Returns the position of an element relative to another element in the
+ * document.  A relative to B
+ * @param {Element|Event|goog.events.Event} a Element or mouse event whose
+ *     position we're calculating.
+ * @param {Element|Event|goog.events.Event} b Element or mouse event position
+ *     is relative to.
+ * @return {!goog.math.Coordinate} The relative position.
+ */
+goog.style.getRelativePosition = function(a, b) {
+  var ap = goog.style.getClientPosition(a);
+  var bp = goog.style.getClientPosition(b);
+  return new goog.math.Coordinate(ap.x - bp.x, ap.y - bp.y);
+};
+
+
+/**
+ * Returns the position of the event or the element's border box relative to
+ * the client viewport.
+ * @param {!Element} el Element whose position to get.
+ * @return {!goog.math.Coordinate} The position.
+ * @private
+ */
+goog.style.getClientPositionForElement_ = function(el) {
+  var box = goog.style.getBoundingClientRect_(el);
+  return new goog.math.Coordinate(box.left, box.top);
+};
+
+
+/**
+ * Returns the position of the event or the element's border box relative to
+ * the client viewport. If an event is passed, and if this event is a "touch"
+ * event, then the position of the first changedTouches will be returned.
+ * @param {Element|Event|goog.events.Event} el Element or a mouse / touch event.
+ * @return {!goog.math.Coordinate} The position.
+ */
+goog.style.getClientPosition = function(el) {
+  goog.asserts.assert(el);
+  if (el.nodeType == goog.dom.NodeType.ELEMENT) {
+    return goog.style.getClientPositionForElement_(
+        /** @type {!Element} */ (el));
+  } else {
+    var targetEvent = el.changedTouches ? el.changedTouches[0] : el;
+    return new goog.math.Coordinate(
+        targetEvent.clientX,
+        targetEvent.clientY);
+  }
+};
+
+
+/**
+ * Moves an element to the given coordinates relative to the client viewport.
+ * @param {Element} el Absolutely positioned element to set page offset for.
+ *     It must be in the document.
+ * @param {number|goog.math.Coordinate} x Left position of the element's margin
+ *     box or a coordinate object.
+ * @param {number=} opt_y Top position of the element's margin box.
+ */
+goog.style.setPageOffset = function(el, x, opt_y) {
+  // Get current pageoffset
+  var cur = goog.style.getPageOffset(el);
+
+  if (x instanceof goog.math.Coordinate) {
+    opt_y = x.y;
+    x = x.x;
+  }
+
+  // NOTE(arv): We cannot allow strings for x and y. We could but that would
+  // require us to manually transform between different units
+
+  // Work out deltas
+  var dx = x - cur.x;
+  var dy = opt_y - cur.y;
+
+  // Set position to current left/top + delta
+  goog.style.setPosition(el, /** @type {!HTMLElement} */ (el).offsetLeft + dx,
+                         /** @type {!HTMLElement} */ (el).offsetTop + dy);
+};
+
+
+/**
+ * Sets the width/height values of an element.  If an argument is numeric,
+ * or a goog.math.Size is passed, it is assumed to be pixels and will add
+ * 'px' after converting it to an integer in string form. (This just sets the
+ * CSS width and height properties so it might set content-box or border-box
+ * size depending on the box model the browser is using.)
+ *
+ * @param {Element} element Element to set the size of.
+ * @param {string|number|goog.math.Size} w Width of the element, or a
+ *     size object.
+ * @param {string|number=} opt_h Height of the element. Required if w is not a
+ *     size object.
+ */
+goog.style.setSize = function(element, w, opt_h) {
+  var h;
+  if (w instanceof goog.math.Size) {
+    h = w.height;
+    w = w.width;
+  } else {
+    if (opt_h == undefined) {
+      throw Error('missing height argument');
+    }
+    h = opt_h;
+  }
+
+  goog.style.setWidth(element, /** @type {string|number} */ (w));
+  goog.style.setHeight(element, h);
+};
+
+
+/**
+ * Helper function to create a string to be set into a pixel-value style
+ * property of an element. Can round to the nearest integer value.
+ *
+ * @param {string|number} value The style value to be used. If a number,
+ *     'px' will be appended, otherwise the value will be applied directly.
+ * @param {boolean} round Whether to round the nearest integer (if property
+ *     is a number).
+ * @return {string} The string value for the property.
+ * @private
+ */
+goog.style.getPixelStyleValue_ = function(value, round) {
+  if (typeof value == 'number') {
+    value = (round ? Math.round(value) : value) + 'px';
+  }
+
+  return value;
+};
+
+
+/**
+ * Set the height of an element.  Sets the element's style property.
+ * @param {Element} element Element to set the height of.
+ * @param {string|number} height The height value to set.  If a number, 'px'
+ *     will be appended, otherwise the value will be applied directly.
+ */
+goog.style.setHeight = function(element, height) {
+  element.style.height = goog.style.getPixelStyleValue_(height, true);
+};
+
+
+/**
+ * Set the width of an element.  Sets the element's style property.
+ * @param {Element} element Element to set the width of.
+ * @param {string|number} width The width value to set.  If a number, 'px'
+ *     will be appended, otherwise the value will be applied directly.
+ */
+goog.style.setWidth = function(element, width) {
+  element.style.width = goog.style.getPixelStyleValue_(width, true);
+};
+
+
+/**
+ * Gets the height and width of an element, even if its display is none.
+ *
+ * Specifically, this returns the height and width of the border box,
+ * irrespective of the box model in effect.
+ *
+ * Note that this function does not take CSS transforms into account. Please see
+ * {@code goog.style.getTransformedSize}.
+ * @param {Element} element Element to get size of.
+ * @return {!goog.math.Size} Object with width/height properties.
+ */
+goog.style.getSize = function(element) {
+  return goog.style.evaluateWithTemporaryDisplay_(
+      goog.style.getSizeWithDisplay_, /** @type {!Element} */ (element));
+};
+
+
+/**
+ * Call {@code fn} on {@code element} such that {@code element}'s dimensions are
+ * accurate when it's passed to {@code fn}.
+ * @param {function(!Element): T} fn Function to call with {@code element} as
+ *     an argument after temporarily changing {@code element}'s display such
+ *     that its dimensions are accurate.
+ * @param {!Element} element Element (which may have display none) to use as
+ *     argument to {@code fn}.
+ * @return {T} Value returned by calling {@code fn} with {@code element}.
+ * @template T
+ * @private
+ */
+goog.style.evaluateWithTemporaryDisplay_ = function(fn, element) {
+  if (goog.style.getStyle_(element, 'display') != 'none') {
+    return fn(element);
+  }
+
+  var style = element.style;
+  var originalDisplay = style.display;
+  var originalVisibility = style.visibility;
+  var originalPosition = style.position;
+
+  style.visibility = 'hidden';
+  style.position = 'absolute';
+  style.display = 'inline';
+
+  var retVal = fn(element);
+
+  style.display = originalDisplay;
+  style.position = originalPosition;
+  style.visibility = originalVisibility;
+
+  return retVal;
+};
+
+
+/**
+ * Gets the height and width of an element when the display is not none.
+ * @param {Element} element Element to get size of.
+ * @return {!goog.math.Size} Object with width/height properties.
+ * @private
+ */
+goog.style.getSizeWithDisplay_ = function(element) {
+  var offsetWidth = /** @type {!HTMLElement} */ (element).offsetWidth;
+  var offsetHeight = /** @type {!HTMLElement} */ (element).offsetHeight;
+  var webkitOffsetsZero =
+      goog.userAgent.WEBKIT && !offsetWidth && !offsetHeight;
+  if ((!goog.isDef(offsetWidth) || webkitOffsetsZero) &&
+      element.getBoundingClientRect) {
+    // Fall back to calling getBoundingClientRect when offsetWidth or
+    // offsetHeight are not defined, or when they are zero in WebKit browsers.
+    // This makes sure that we return for the correct size for SVG elements, but
+    // will still return 0 on Webkit prior to 534.8, see
+    // http://trac.webkit.org/changeset/67252.
+    var clientRect = goog.style.getBoundingClientRect_(element);
+    return new goog.math.Size(clientRect.right - clientRect.left,
+        clientRect.bottom - clientRect.top);
+  }
+  return new goog.math.Size(offsetWidth, offsetHeight);
+};
+
+
+/**
+ * Gets the height and width of an element, post transform, even if its display
+ * is none.
+ *
+ * This is like {@code goog.style.getSize}, except:
+ * <ol>
+ * <li>Takes webkitTransforms such as rotate and scale into account.
+ * <li>Will return null if {@code element} doesn't respond to
+ *     {@code getBoundingClientRect}.
+ * <li>Currently doesn't make sense on non-WebKit browsers which don't support
+ *    webkitTransforms.
+ * </ol>
+ * @param {!Element} element Element to get size of.
+ * @return {goog.math.Size} Object with width/height properties.
+ */
+goog.style.getTransformedSize = function(element) {
+  if (!element.getBoundingClientRect) {
+    return null;
+  }
+
+  var clientRect = goog.style.evaluateWithTemporaryDisplay_(
+      goog.style.getBoundingClientRect_, element);
+  return new goog.math.Size(clientRect.right - clientRect.left,
+      clientRect.bottom - clientRect.top);
+};
+
+
+/**
+ * Returns a bounding rectangle for a given element in page space.
+ * @param {Element} element Element to get bounds of. Must not be display none.
+ * @return {!goog.math.Rect} Bounding rectangle for the element.
+ */
+goog.style.getBounds = function(element) {
+  var o = goog.style.getPageOffset(element);
+  var s = goog.style.getSize(element);
+  return new goog.math.Rect(o.x, o.y, s.width, s.height);
+};
+
+
+/**
+ * Converts a CSS selector in the form style-property to styleProperty.
+ * @param {*} selector CSS Selector.
+ * @return {string} Camel case selector.
+ * @deprecated Use goog.string.toCamelCase instead.
+ */
+goog.style.toCamelCase = function(selector) {
+  return goog.string.toCamelCase(String(selector));
+};
+
+
+/**
+ * Converts a CSS selector in the form styleProperty to style-property.
+ * @param {string} selector Camel case selector.
+ * @return {string} Selector cased.
+ * @deprecated Use goog.string.toSelectorCase instead.
+ */
+goog.style.toSelectorCase = function(selector) {
+  return goog.string.toSelectorCase(selector);
+};
+
+
+/**
+ * Gets the opacity of a node (x-browser). This gets the inline style opacity
+ * of the node, and does not take into account the cascaded or the computed
+ * style for this node.
+ * @param {Element} el Element whose opacity has to be found.
+ * @return {number|string} Opacity between 0 and 1 or an empty string {@code ''}
+ *     if the opacity is not set.
+ */
+goog.style.getOpacity = function(el) {
+  var style = el.style;
+  var result = '';
+  if ('opacity' in style) {
+    result = style.opacity;
+  } else if ('MozOpacity' in style) {
+    result = style.MozOpacity;
+  } else if ('filter' in style) {
+    var match = style.filter.match(/alpha\(opacity=([\d.]+)\)/);
+    if (match) {
+      result = String(match[1] / 100);
+    }
+  }
+  return result == '' ? result : Number(result);
+};
+
+
+/**
+ * Sets the opacity of a node (x-browser).
+ * @param {Element} el Elements whose opacity has to be set.
+ * @param {number|string} alpha Opacity between 0 and 1 or an empty string
+ *     {@code ''} to clear the opacity.
+ */
+goog.style.setOpacity = function(el, alpha) {
+  var style = el.style;
+  if ('opacity' in style) {
+    style.opacity = alpha;
+  } else if ('MozOpacity' in style) {
+    style.MozOpacity = alpha;
+  } else if ('filter' in style) {
+    // TODO(arv): Overwriting the filter might have undesired side effects.
+    if (alpha === '') {
+      style.filter = '';
+    } else {
+      style.filter = 'alpha(opacity=' + alpha * 100 + ')';
+    }
+  }
+};
+
+
+/**
+ * Sets the background of an element to a transparent image in a browser-
+ * independent manner.
+ *
+ * This function does not support repeating backgrounds or alternate background
+ * positions to match the behavior of Internet Explorer. It also does not
+ * support sizingMethods other than crop since they cannot be replicated in
+ * browsers other than Internet Explorer.
+ *
+ * @param {Element} el The element to set background on.
+ * @param {string} src The image source URL.
+ */
+goog.style.setTransparentBackgroundImage = function(el, src) {
+  var style = el.style;
+  // It is safe to use the style.filter in IE only. In Safari 'filter' is in
+  // style object but access to style.filter causes it to throw an exception.
+  // Note: IE8 supports images with an alpha channel.
+  if (goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('8')) {
+    // See TODO in setOpacity.
+    style.filter = 'progid:DXImageTransform.Microsoft.AlphaImageLoader(' +
+        'src="' + src + '", sizingMethod="crop")';
+  } else {
+    // Set style properties individually instead of using background shorthand
+    // to prevent overwriting a pre-existing background color.
+    style.backgroundImage = 'url(' + src + ')';
+    style.backgroundPosition = 'top left';
+    style.backgroundRepeat = 'no-repeat';
+  }
+};
+
+
+/**
+ * Clears the background image of an element in a browser independent manner.
+ * @param {Element} el The element to clear background image for.
+ */
+goog.style.clearTransparentBackgroundImage = function(el) {
+  var style = el.style;
+  if ('filter' in style) {
+    // See TODO in setOpacity.
+    style.filter = '';
+  } else {
+    // Set style properties individually instead of using background shorthand
+    // to prevent overwriting a pre-existing background color.
+    style.backgroundImage = 'none';
+  }
+};
+
+
+/**
+ * Shows or hides an element from the page. Hiding the element is done by
+ * setting the display property to "none", removing the element from the
+ * rendering hierarchy so it takes up no space. To show the element, the default
+ * inherited display property is restored (defined either in stylesheets or by
+ * the browser's default style rules.)
+ *
+ * Caveat 1: if the inherited display property for the element is set to "none"
+ * by the stylesheets, that is the property that will be restored by a call to
+ * showElement(), effectively toggling the display between "none" and "none".
+ *
+ * Caveat 2: if the element display style is set inline (by setting either
+ * element.style.display or a style attribute in the HTML), a call to
+ * showElement will clear that setting and defer to the inherited style in the
+ * stylesheet.
+ * @param {Element} el Element to show or hide.
+ * @param {*} display True to render the element in its default style,
+ *     false to disable rendering the element.
+ * @deprecated Use goog.style.setElementShown instead.
+ */
+goog.style.showElement = function(el, display) {
+  goog.style.setElementShown(el, display);
+};
+
+
+/**
+ * Shows or hides an element from the page. Hiding the element is done by
+ * setting the display property to "none", removing the element from the
+ * rendering hierarchy so it takes up no space. To show the element, the default
+ * inherited display property is restored (defined either in stylesheets or by
+ * the browser's default style rules).
+ *
+ * Caveat 1: if the inherited display property for the element is set to "none"
+ * by the stylesheets, that is the property that will be restored by a call to
+ * setElementShown(), effectively toggling the display between "none" and
+ * "none".
+ *
+ * Caveat 2: if the element display style is set inline (by setting either
+ * element.style.display or a style attribute in the HTML), a call to
+ * setElementShown will clear that setting and defer to the inherited style in
+ * the stylesheet.
+ * @param {Element} el Element to show or hide.
+ * @param {*} isShown True to render the element in its default style,
+ *     false to disable rendering the element.
+ */
+goog.style.setElementShown = function(el, isShown) {
+  el.style.display = isShown ? '' : 'none';
+};
+
+
+/**
+ * Test whether the given element has been shown or hidden via a call to
+ * {@link #setElementShown}.
+ *
+ * Note this is strictly a companion method for a call
+ * to {@link #setElementShown} and the same caveats apply; in particular, this
+ * method does not guarantee that the return value will be consistent with
+ * whether or not the element is actually visible.
+ *
+ * @param {Element} el The element to test.
+ * @return {boolean} Whether the element has been shown.
+ * @see #setElementShown
+ */
+goog.style.isElementShown = function(el) {
+  return el.style.display != 'none';
+};
+
+
+/**
+ * Installs the styles string into the window that contains opt_element.  If
+ * opt_element is null, the main window is used.
+ * @param {string} stylesString The style string to install.
+ * @param {Node=} opt_node Node whose parent document should have the
+ *     styles installed.
+ * @return {Element|StyleSheet} The style element created.
+ */
+goog.style.installStyles = function(stylesString, opt_node) {
+  var dh = goog.dom.getDomHelper(opt_node);
+  var styleSheet = null;
+
+  // IE < 11 requires createStyleSheet. Note that doc.createStyleSheet will be
+  // undefined as of IE 11.
+  var doc = dh.getDocument();
+  if (goog.userAgent.IE && doc.createStyleSheet) {
+    styleSheet = doc.createStyleSheet();
+    goog.style.setStyles(styleSheet, stylesString);
+  } else {
+    var head = dh.getElementsByTagNameAndClass(goog.dom.TagName.HEAD)[0];
+
+    // In opera documents are not guaranteed to have a head element, thus we
+    // have to make sure one exists before using it.
+    if (!head) {
+      var body = dh.getElementsByTagNameAndClass(goog.dom.TagName.BODY)[0];
+      head = dh.createDom(goog.dom.TagName.HEAD);
+      body.parentNode.insertBefore(head, body);
+    }
+    styleSheet = dh.createDom(goog.dom.TagName.STYLE);
+    // NOTE(user): Setting styles after the style element has been appended
+    // to the head results in a nasty Webkit bug in certain scenarios. Please
+    // refer to https://bugs.webkit.org/show_bug.cgi?id=26307 for additional
+    // details.
+    goog.style.setStyles(styleSheet, stylesString);
+    dh.appendChild(head, styleSheet);
+  }
+  return styleSheet;
+};
+
+
+/**
+ * Removes the styles added by {@link #installStyles}.
+ * @param {Element|StyleSheet} styleSheet The value returned by
+ *     {@link #installStyles}.
+ */
+goog.style.uninstallStyles = function(styleSheet) {
+  var node = styleSheet.ownerNode || styleSheet.owningElement ||
+      /** @type {Element} */ (styleSheet);
+  goog.dom.removeNode(node);
+};
+
+
+/**
+ * Sets the content of a style element.  The style element can be any valid
+ * style element.  This element will have its content completely replaced by
+ * the new stylesString.
+ * @param {Element|StyleSheet} element A stylesheet element as returned by
+ *     installStyles.
+ * @param {string} stylesString The new content of the stylesheet.
+ */
+goog.style.setStyles = function(element, stylesString) {
+  if (goog.userAgent.IE && goog.isDef(element.cssText)) {
+    // Adding the selectors individually caused the browser to hang if the
+    // selector was invalid or there were CSS comments.  Setting the cssText of
+    // the style node works fine and ignores CSS that IE doesn't understand.
+    // However IE >= 11 doesn't support cssText any more, so we make sure that
+    // cssText is a defined property and otherwise fall back to innerHTML.
+    element.cssText = stylesString;
+  } else {
+    element.innerHTML = stylesString;
+  }
+};
+
+
+/**
+ * Sets 'white-space: pre-wrap' for a node (x-browser).
+ *
+ * There are as many ways of specifying pre-wrap as there are browsers.
+ *
+ * CSS3/IE8: white-space: pre-wrap;
+ * Mozilla:  white-space: -moz-pre-wrap;
+ * Opera:    white-space: -o-pre-wrap;
+ * IE6/7:    white-space: pre; word-wrap: break-word;
+ *
+ * @param {Element} el Element to enable pre-wrap for.
+ */
+goog.style.setPreWrap = function(el) {
+  var style = el.style;
+  if (goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('8')) {
+    style.whiteSpace = 'pre';
+    style.wordWrap = 'break-word';
+  } else if (goog.userAgent.GECKO) {
+    style.whiteSpace = '-moz-pre-wrap';
+  } else {
+    style.whiteSpace = 'pre-wrap';
+  }
+};
+
+
+/**
+ * Sets 'display: inline-block' for an element (cross-browser).
+ * @param {Element} el Element to which the inline-block display style is to be
+ *    applied.
+ * @see ../demos/inline_block_quirks.html
+ * @see ../demos/inline_block_standards.html
+ */
+goog.style.setInlineBlock = function(el) {
+  var style = el.style;
+  // Without position:relative, weirdness ensues.  Just accept it and move on.
+  style.position = 'relative';
+
+  if (goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('8')) {
+    // IE8 supports inline-block so fall through to the else
+    // Zoom:1 forces hasLayout, display:inline gives inline behavior.
+    style.zoom = '1';
+    style.display = 'inline';
+  } else {
+    // Opera, Webkit, and Safari seem to do OK with the standard inline-block
+    // style.
+    style.display = 'inline-block';
+  }
+};
+
+
+/**
+ * Returns true if the element is using right to left (rtl) direction.
+ * @param {Element} el  The element to test.
+ * @return {boolean} True for right to left, false for left to right.
+ */
+goog.style.isRightToLeft = function(el) {
+  return 'rtl' == goog.style.getStyle_(el, 'direction');
+};
+
+
+/**
+ * The CSS style property corresponding to an element being
+ * unselectable on the current browser platform (null if none).
+ * Opera and IE instead use a DOM attribute 'unselectable'.
+ * @type {?string}
+ * @private
+ */
+goog.style.unselectableStyle_ =
+    goog.userAgent.GECKO ? 'MozUserSelect' :
+    goog.userAgent.WEBKIT ? 'WebkitUserSelect' :
+    null;
+
+
+/**
+ * Returns true if the element is set to be unselectable, false otherwise.
+ * Note that on some platforms (e.g. Mozilla), even if an element isn't set
+ * to be unselectable, it will behave as such if any of its ancestors is
+ * unselectable.
+ * @param {Element} el  Element to check.
+ * @return {boolean}  Whether the element is set to be unselectable.
+ */
+goog.style.isUnselectable = function(el) {
+  if (goog.style.unselectableStyle_) {
+    return el.style[goog.style.unselectableStyle_].toLowerCase() == 'none';
+  } else if (goog.userAgent.IE || goog.userAgent.OPERA) {
+    return el.getAttribute('unselectable') == 'on';
+  }
+  return false;
+};
+
+
+/**
+ * Makes the element and its descendants selectable or unselectable.  Note
+ * that on some platforms (e.g. Mozilla), even if an element isn't set to
+ * be unselectable, it will behave as such if any of its ancestors is
+ * unselectable.
+ * @param {Element} el  The element to alter.
+ * @param {boolean} unselectable  Whether the element and its descendants
+ *     should be made unselectable.
+ * @param {boolean=} opt_noRecurse  Whether to only alter the element's own
+ *     selectable state, and leave its descendants alone; defaults to false.
+ */
+goog.style.setUnselectable = function(el, unselectable, opt_noRecurse) {
+  // TODO(attila): Do we need all of TR_DomUtil.makeUnselectable() in Closure?
+  var descendants = !opt_noRecurse ? el.getElementsByTagName('*') : null;
+  var name = goog.style.unselectableStyle_;
+  if (name) {
+    // Add/remove the appropriate CSS style to/from the element and its
+    // descendants.
+    var value = unselectable ? 'none' : '';
+    // MathML elements do not have a style property. Verify before setting.
+    if (el.style) {
+      el.style[name] = value;
+    }
+    if (descendants) {
+      for (var i = 0, descendant; descendant = descendants[i]; i++) {
+        if (descendant.style) {
+          descendant.style[name] = value;
+        }
+      }
+    }
+  } else if (goog.userAgent.IE || goog.userAgent.OPERA) {
+    // Toggle the 'unselectable' attribute on the element and its descendants.
+    var value = unselectable ? 'on' : '';
+    el.setAttribute('unselectable', value);
+    if (descendants) {
+      for (var i = 0, descendant; descendant = descendants[i]; i++) {
+        descendant.setAttribute('unselectable', value);
+      }
+    }
+  }
+};
+
+
+/**
+ * Gets the border box size for an element.
+ * @param {Element} element  The element to get the size for.
+ * @return {!goog.math.Size} The border box size.
+ */
+goog.style.getBorderBoxSize = function(element) {
+  return new goog.math.Size(
+      /** @type {!HTMLElement} */ (element).offsetWidth,
+      /** @type {!HTMLElement} */ (element).offsetHeight);
+};
+
+
+/**
+ * Sets the border box size of an element. This is potentially expensive in IE
+ * if the document is CSS1Compat mode
+ * @param {Element} element  The element to set the size on.
+ * @param {goog.math.Size} size  The new size.
+ */
+goog.style.setBorderBoxSize = function(element, size) {
+  var doc = goog.dom.getOwnerDocument(element);
+  var isCss1CompatMode = goog.dom.getDomHelper(doc).isCss1CompatMode();
+
+  if (goog.userAgent.IE &&
+      !goog.userAgent.isVersionOrHigher('10') &&
+      (!isCss1CompatMode || !goog.userAgent.isVersionOrHigher('8'))) {
+    var style = element.style;
+    if (isCss1CompatMode) {
+      var paddingBox = goog.style.getPaddingBox(element);
+      var borderBox = goog.style.getBorderBox(element);
+      style.pixelWidth = size.width - borderBox.left - paddingBox.left -
+                         paddingBox.right - borderBox.right;
+      style.pixelHeight = size.height - borderBox.top - paddingBox.top -
+                          paddingBox.bottom - borderBox.bottom;
+    } else {
+      style.pixelWidth = size.width;
+      style.pixelHeight = size.height;
+    }
+  } else {
+    goog.style.setBoxSizingSize_(element, size, 'border-box');
+  }
+};
+
+
+/**
+ * Gets the content box size for an element.  This is potentially expensive in
+ * all browsers.
+ * @param {Element} element  The element to get the size for.
+ * @return {!goog.math.Size} The content box size.
+ */
+goog.style.getContentBoxSize = function(element) {
+  var doc = goog.dom.getOwnerDocument(element);
+  var ieCurrentStyle = goog.userAgent.IE && element.currentStyle;
+  if (ieCurrentStyle &&
+      goog.dom.getDomHelper(doc).isCss1CompatMode() &&
+      ieCurrentStyle.width != 'auto' && ieCurrentStyle.height != 'auto' &&
+      !ieCurrentStyle.boxSizing) {
+    // If IE in CSS1Compat mode than just use the width and height.
+    // If we have a boxSizing then fall back on measuring the borders etc.
+    var width = goog.style.getIePixelValue_(element, ieCurrentStyle.width,
+                                            'width', 'pixelWidth');
+    var height = goog.style.getIePixelValue_(element, ieCurrentStyle.height,
+                                             'height', 'pixelHeight');
+    return new goog.math.Size(width, height);
+  } else {
+    var borderBoxSize = goog.style.getBorderBoxSize(element);
+    var paddingBox = goog.style.getPaddingBox(element);
+    var borderBox = goog.style.getBorderBox(element);
+    return new goog.math.Size(borderBoxSize.width -
+                              borderBox.left - paddingBox.left -
+                              paddingBox.right - borderBox.right,
+                              borderBoxSize.height -
+                              borderBox.top - paddingBox.top -
+                              paddingBox.bottom - borderBox.bottom);
+  }
+};
+
+
+/**
+ * Sets the content box size of an element. This is potentially expensive in IE
+ * if the document is BackCompat mode.
+ * @param {Element} element  The element to set the size on.
+ * @param {goog.math.Size} size  The new size.
+ */
+goog.style.setContentBoxSize = function(element, size) {
+  var doc = goog.dom.getOwnerDocument(element);
+  var isCss1CompatMode = goog.dom.getDomHelper(doc).isCss1CompatMode();
+  if (goog.userAgent.IE &&
+      !goog.userAgent.isVersionOrHigher('10') &&
+      (!isCss1CompatMode || !goog.userAgent.isVersionOrHigher('8'))) {
+    var style = element.style;
+    if (isCss1CompatMode) {
+      style.pixelWidth = size.width;
+      style.pixelHeight = size.height;
+    } else {
+      var paddingBox = goog.style.getPaddingBox(element);
+      var borderBox = goog.style.getBorderBox(element);
+      style.pixelWidth = size.width + borderBox.left + paddingBox.left +
+                         paddingBox.right + borderBox.right;
+      style.pixelHeight = size.height + borderBox.top + paddingBox.top +
+                          paddingBox.bottom + borderBox.bottom;
+    }
+  } else {
+    goog.style.setBoxSizingSize_(element, size, 'content-box');
+  }
+};
+
+
+/**
+ * Helper function that sets the box sizing as well as the width and height
+ * @param {Element} element  The element to set the size on.
+ * @param {goog.math.Size} size  The new size to set.
+ * @param {string} boxSizing  The box-sizing value.
+ * @private
+ */
+goog.style.setBoxSizingSize_ = function(element, size, boxSizing) {
+  var style = element.style;
+  if (goog.userAgent.GECKO) {
+    style.MozBoxSizing = boxSizing;
+  } else if (goog.userAgent.WEBKIT) {
+    style.WebkitBoxSizing = boxSizing;
+  } else {
+    // Includes IE8 and Opera 9.50+
+    style.boxSizing = boxSizing;
+  }
+
+  // Setting this to a negative value will throw an exception on IE
+  // (and doesn't do anything different than setting it to 0).
+  style.width = Math.max(size.width, 0) + 'px';
+  style.height = Math.max(size.height, 0) + 'px';
+};
+
+
+/**
+ * IE specific function that converts a non pixel unit to pixels.
+ * @param {Element} element  The element to convert the value for.
+ * @param {string} value  The current value as a string. The value must not be
+ *     ''.
+ * @param {string} name  The CSS property name to use for the converstion. This
+ *     should be 'left', 'top', 'width' or 'height'.
+ * @param {string} pixelName  The CSS pixel property name to use to get the
+ *     value in pixels.
+ * @return {number} The value in pixels.
+ * @private
+ */
+goog.style.getIePixelValue_ = function(element, value, name, pixelName) {
+  // Try if we already have a pixel value. IE does not do half pixels so we
+  // only check if it matches a number followed by 'px'.
+  if (/^\d+px?$/.test(value)) {
+    return parseInt(value, 10);
+  } else {
+    var oldStyleValue = element.style[name];
+    var oldRuntimeValue = element.runtimeStyle[name];
+    // set runtime style to prevent changes
+    element.runtimeStyle[name] = element.currentStyle[name];
+    element.style[name] = value;
+    var pixelValue = element.style[pixelName];
+    // restore
+    element.style[name] = oldStyleValue;
+    element.runtimeStyle[name] = oldRuntimeValue;
+    return pixelValue;
+  }
+};
+
+
+/**
+ * Helper function for getting the pixel padding or margin for IE.
+ * @param {Element} element  The element to get the padding for.
+ * @param {string} propName  The property name.
+ * @return {number} The pixel padding.
+ * @private
+ */
+goog.style.getIePixelDistance_ = function(element, propName) {
+  var value = goog.style.getCascadedStyle(element, propName);
+  return value ?
+      goog.style.getIePixelValue_(element, value, 'left', 'pixelLeft') : 0;
+};
+
+
+/**
+ * Gets the computed paddings or margins (on all sides) in pixels.
+ * @param {Element} element  The element to get the padding for.
+ * @param {string} stylePrefix  Pass 'padding' to retrieve the padding box,
+ *     or 'margin' to retrieve the margin box.
+ * @return {!goog.math.Box} The computed paddings or margins.
+ * @private
+ */
+goog.style.getBox_ = function(element, stylePrefix) {
+  if (goog.userAgent.IE) {
+    var left = goog.style.getIePixelDistance_(element, stylePrefix + 'Left');
+    var right = goog.style.getIePixelDistance_(element, stylePrefix + 'Right');
+    var top = goog.style.getIePixelDistance_(element, stylePrefix + 'Top');
+    var bottom = goog.style.getIePixelDistance_(
+        element, stylePrefix + 'Bottom');
+    return new goog.math.Box(top, right, bottom, left);
+  } else {
+    // On non-IE browsers, getComputedStyle is always non-null.
+    var left = goog.style.getComputedStyle(element, stylePrefix + 'Left');
+    var right = goog.style.getComputedStyle(element, stylePrefix + 'Right');
+    var top = goog.style.getComputedStyle(element, stylePrefix + 'Top');
+    var bottom = goog.style.getComputedStyle(element, stylePrefix + 'Bottom');
+
+    // NOTE(arv): Gecko can return floating point numbers for the computed
+    // style values.
+    return new goog.math.Box(parseFloat(top),
+                             parseFloat(right),
+                             parseFloat(bottom),
+                             parseFloat(left));
+  }
+};
+
+
+/**
+ * Gets the computed paddings (on all sides) in pixels.
+ * @param {Element} element  The element to get the padding for.
+ * @return {!goog.math.Box} The computed paddings.
+ */
+goog.style.getPaddingBox = function(element) {
+  return goog.style.getBox_(element, 'padding');
+};
+
+
+/**
+ * Gets the computed margins (on all sides) in pixels.
+ * @param {Element} element  The element to get the margins for.
+ * @return {!goog.math.Box} The computed margins.
+ */
+goog.style.getMarginBox = function(element) {
+  return goog.style.getBox_(element, 'margin');
+};
+
+
+/**
+ * A map used to map the border width keywords to a pixel width.
+ * @type {Object}
+ * @private
+ */
+goog.style.ieBorderWidthKeywords_ = {
+  'thin': 2,
+  'medium': 4,
+  'thick': 6
+};
+
+
+/**
+ * Helper function for IE to get the pixel border.
+ * @param {Element} element  The element to get the pixel border for.
+ * @param {string} prop  The part of the property name.
+ * @return {number} The value in pixels.
+ * @private
+ */
+goog.style.getIePixelBorder_ = function(element, prop) {
+  if (goog.style.getCascadedStyle(element, prop + 'Style') == 'none') {
+    return 0;
+  }
+  var width = goog.style.getCascadedStyle(element, prop + 'Width');
+  if (width in goog.style.ieBorderWidthKeywords_) {
+    return goog.style.ieBorderWidthKeywords_[width];
+  }
+  return goog.style.getIePixelValue_(element, width, 'left', 'pixelLeft');
+};
+
+
+/**
+ * Gets the computed border widths (on all sides) in pixels
+ * @param {Element} element  The element to get the border widths for.
+ * @return {!goog.math.Box} The computed border widths.
+ */
+goog.style.getBorderBox = function(element) {
+  if (goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(9)) {
+    var left = goog.style.getIePixelBorder_(element, 'borderLeft');
+    var right = goog.style.getIePixelBorder_(element, 'borderRight');
+    var top = goog.style.getIePixelBorder_(element, 'borderTop');
+    var bottom = goog.style.getIePixelBorder_(element, 'borderBottom');
+    return new goog.math.Box(top, right, bottom, left);
+  } else {
+    // On non-IE browsers, getComputedStyle is always non-null.
+    var left = goog.style.getComputedStyle(element, 'borderLeftWidth');
+    var right = goog.style.getComputedStyle(element, 'borderRightWidth');
+    var top = goog.style.getComputedStyle(element, 'borderTopWidth');
+    var bottom = goog.style.getComputedStyle(element, 'borderBottomWidth');
+
+    return new goog.math.Box(parseFloat(top),
+                             parseFloat(right),
+                             parseFloat(bottom),
+                             parseFloat(left));
+  }
+};
+
+
+/**
+ * Returns the font face applied to a given node. Opera and IE should return
+ * the font actually displayed. Firefox returns the author's most-preferred
+ * font (whether the browser is capable of displaying it or not.)
+ * @param {Element} el  The element whose font family is returned.
+ * @return {string} The font family applied to el.
+ */
+goog.style.getFontFamily = function(el) {
+  var doc = goog.dom.getOwnerDocument(el);
+  var font = '';
+  // The moveToElementText method from the TextRange only works if the element
+  // is attached to the owner document.
+  if (doc.body.createTextRange && goog.dom.contains(doc, el)) {
+    var range = doc.body.createTextRange();
+    range.moveToElementText(el);
+    /** @preserveTry */
+    try {
+      font = range.queryCommandValue('FontName');
+    } catch (e) {
+      // This is a workaround for a awkward exception.
+      // On some IE, there is an exception coming from it.
+      // The error description from this exception is:
+      // This window has already been registered as a drop target
+      // This is bogus description, likely due to a bug in ie.
+      font = '';
+    }
+  }
+  if (!font) {
+    // Note if for some reason IE can't derive FontName with a TextRange, we
+    // fallback to using currentStyle
+    font = goog.style.getStyle_(el, 'fontFamily');
+  }
+
+  // Firefox returns the applied font-family string (author's list of
+  // preferred fonts.) We want to return the most-preferred font, in lieu of
+  // the *actually* applied font.
+  var fontsArray = font.split(',');
+  if (fontsArray.length > 1) font = fontsArray[0];
+
+  // Sanitize for x-browser consistency:
+  // Strip quotes because browsers aren't consistent with how they're
+  // applied; Opera always encloses, Firefox sometimes, and IE never.
+  return goog.string.stripQuotes(font, '"\'');
+};
+
+
+/**
+ * Regular expression used for getLengthUnits.
+ * @type {RegExp}
+ * @private
+ */
+goog.style.lengthUnitRegex_ = /[^\d]+$/;
+
+
+/**
+ * Returns the units used for a CSS length measurement.
+ * @param {string} value  A CSS length quantity.
+ * @return {?string} The units of measurement.
+ */
+goog.style.getLengthUnits = function(value) {
+  var units = value.match(goog.style.lengthUnitRegex_);
+  return units && units[0] || null;
+};
+
+
+/**
+ * Map of absolute CSS length units
+ * @type {Object}
+ * @private
+ */
+goog.style.ABSOLUTE_CSS_LENGTH_UNITS_ = {
+  'cm' : 1,
+  'in' : 1,
+  'mm' : 1,
+  'pc' : 1,
+  'pt' : 1
+};
+
+
+/**
+ * Map of relative CSS length units that can be accurately converted to px
+ * font-size values using getIePixelValue_. Only units that are defined in
+ * relation to a font size are convertible (%, small, etc. are not).
+ * @type {Object}
+ * @private
+ */
+goog.style.CONVERTIBLE_RELATIVE_CSS_UNITS_ = {
+  'em' : 1,
+  'ex' : 1
+};
+
+
+/**
+ * Returns the font size, in pixels, of text in an element.
+ * @param {Element} el  The element whose font size is returned.
+ * @return {number} The font size (in pixels).
+ */
+goog.style.getFontSize = function(el) {
+  var fontSize = goog.style.getStyle_(el, 'fontSize');
+  var sizeUnits = goog.style.getLengthUnits(fontSize);
+  if (fontSize && 'px' == sizeUnits) {
+    // NOTE(user): This could be parseFloat instead, but IE doesn't return
+    // decimal fractions in getStyle_ and Firefox reports the fractions, but
+    // ignores them when rendering. Interestingly enough, when we force the
+    // issue and size something to e.g., 50% of 25px, the browsers round in
+    // opposite directions with Firefox reporting 12px and IE 13px. I punt.
+    return parseInt(fontSize, 10);
+  }
+
+  // In IE, we can convert absolute length units to a px value using
+  // goog.style.getIePixelValue_. Units defined in relation to a font size
+  // (em, ex) are applied relative to the element's parentNode and can also
+  // be converted.
+  if (goog.userAgent.IE) {
+    if (sizeUnits in goog.style.ABSOLUTE_CSS_LENGTH_UNITS_) {
+      return goog.style.getIePixelValue_(el,
+                                         fontSize,
+                                         'left',
+                                         'pixelLeft');
+    } else if (el.parentNode &&
+               el.parentNode.nodeType == goog.dom.NodeType.ELEMENT &&
+               sizeUnits in goog.style.CONVERTIBLE_RELATIVE_CSS_UNITS_) {
+      // Check the parent size - if it is the same it means the relative size
+      // value is inherited and we therefore don't want to count it twice.  If
+      // it is different, this element either has explicit style or has a CSS
+      // rule applying to it.
+      var parentElement = /** @type {!Element} */ (el.parentNode);
+      var parentSize = goog.style.getStyle_(parentElement, 'fontSize');
+      return goog.style.getIePixelValue_(parentElement,
+                                         fontSize == parentSize ?
+                                             '1em' : fontSize,
+                                         'left',
+                                         'pixelLeft');
+    }
+  }
+
+  // Sometimes we can't cleanly find the font size (some units relative to a
+  // node's parent's font size are difficult: %, smaller et al), so we create
+  // an invisible, absolutely-positioned span sized to be the height of an 'M'
+  // rendered in its parent's (i.e., our target element's) font size. This is
+  // the definition of CSS's font size attribute.
+  var sizeElement = goog.dom.createDom(
+      goog.dom.TagName.SPAN,
+      {'style': 'visibility:hidden;position:absolute;' +
+            'line-height:0;padding:0;margin:0;border:0;height:1em;'});
+  goog.dom.appendChild(el, sizeElement);
+  fontSize = sizeElement.offsetHeight;
+  goog.dom.removeNode(sizeElement);
+
+  return fontSize;
+};
+
+
+/**
+ * Parses a style attribute value.  Converts CSS property names to camel case.
+ * @param {string} value The style attribute value.
+ * @return {!Object} Map of CSS properties to string values.
+ */
+goog.style.parseStyleAttribute = function(value) {
+  var result = {};
+  goog.array.forEach(value.split(/\s*;\s*/), function(pair) {
+    var keyValue = pair.match(/\s*([\w-]+)\s*\:(.+)/);
+    if (keyValue) {
+      var styleName = keyValue[1];
+      var styleValue = goog.string.trim(keyValue[2]);
+      result[goog.string.toCamelCase(styleName.toLowerCase())] = styleValue;
+    }
+  });
+  return result;
+};
+
+
+/**
+ * Reverse of parseStyleAttribute; that is, takes a style object and returns the
+ * corresponding attribute value.  Converts camel case property names to proper
+ * CSS selector names.
+ * @param {Object} obj Map of CSS properties to values.
+ * @return {string} The style attribute value.
+ */
+goog.style.toStyleAttribute = function(obj) {
+  var buffer = [];
+  goog.object.forEach(obj, function(value, key) {
+    buffer.push(goog.string.toSelectorCase(key), ':', value, ';');
+  });
+  return buffer.join('');
+};
+
+
+/**
+ * Sets CSS float property on an element.
+ * @param {Element} el The element to set float property on.
+ * @param {string} value The value of float CSS property to set on this element.
+ */
+goog.style.setFloat = function(el, value) {
+  el.style[goog.userAgent.IE ? 'styleFloat' : 'cssFloat'] = value;
+};
+
+
+/**
+ * Gets value of explicitly-set float CSS property on an element.
+ * @param {Element} el The element to get float property of.
+ * @return {string} The value of explicitly-set float CSS property on this
+ *     element.
+ */
+goog.style.getFloat = function(el) {
+  return el.style[goog.userAgent.IE ? 'styleFloat' : 'cssFloat'] || '';
+};
+
+
+/**
+ * Returns the scroll bar width (represents the width of both horizontal
+ * and vertical scroll).
+ *
+ * @param {string=} opt_className An optional class name (or names) to apply
+ *     to the invisible div created to measure the scrollbar. This is necessary
+ *     if some scrollbars are styled differently than others.
+ * @return {number} The scroll bar width in px.
+ */
+goog.style.getScrollbarWidth = function(opt_className) {
+  // Add two hidden divs.  The child div is larger than the parent and
+  // forces scrollbars to appear on it.
+  // Using overflow:scroll does not work consistently with scrollbars that
+  // are styled with ::-webkit-scrollbar.
+  var outerDiv = goog.dom.createElement(goog.dom.TagName.DIV);
+  if (opt_className) {
+    outerDiv.className = opt_className;
+  }
+  outerDiv.style.cssText = 'overflow:auto;' +
+      'position:absolute;top:0;width:100px;height:100px';
+  var innerDiv = goog.dom.createElement(goog.dom.TagName.DIV);
+  goog.style.setSize(innerDiv, '200px', '200px');
+  outerDiv.appendChild(innerDiv);
+  goog.dom.appendChild(goog.dom.getDocument().body, outerDiv);
+  var width = outerDiv.offsetWidth - outerDiv.clientWidth;
+  goog.dom.removeNode(outerDiv);
+  return width;
+};
+
+
+/**
+ * Regular expression to extract x and y translation components from a CSS
+ * transform Matrix representation.
+ *
+ * @type {!RegExp}
+ * @const
+ * @private
+ */
+goog.style.MATRIX_TRANSLATION_REGEX_ =
+    new RegExp('matrix\\([0-9\\.\\-]+, [0-9\\.\\-]+, ' +
+               '[0-9\\.\\-]+, [0-9\\.\\-]+, ' +
+               '([0-9\\.\\-]+)p?x?, ([0-9\\.\\-]+)p?x?\\)');
+
+
+/**
+ * Returns the x,y translation component of any CSS transforms applied to the
+ * element, in pixels.
+ *
+ * @param {!Element} element The element to get the translation of.
+ * @return {!goog.math.Coordinate} The CSS translation of the element in px.
+ */
+goog.style.getCssTranslation = function(element) {
+  var transform = goog.style.getComputedTransform(element);
+  if (!transform) {
+    return new goog.math.Coordinate(0, 0);
+  }
+  var matches = transform.match(goog.style.MATRIX_TRANSLATION_REGEX_);
+  if (!matches) {
+    return new goog.math.Coordinate(0, 0);
+  }
+  return new goog.math.Coordinate(parseFloat(matches[1]),
+                                  parseFloat(matches[2]));
+};
+
+goog.provide('ol.MapEvent');
+goog.provide('ol.MapEventType');
+
+goog.require('goog.events.Event');
+
+
+/**
+ * @enum {string}
+ */
+ol.MapEventType = {
+
+  /**
+   * Triggered after a map frame is rendered.
+   * @event ol.MapEvent#postrender
+   * @api
+   */
+  POSTRENDER: 'postrender',
+
+  /**
+   * Triggered after the map is moved.
+   * @event ol.MapEvent#moveend
+   * @api stable
+   */
+  MOVEEND: 'moveend'
+
+};
+
+
+
+/**
+ * @classdesc
+ * Events emitted as map events are instances of this type.
+ * See {@link ol.Map} for which events trigger a map event.
+ *
+ * @constructor
+ * @extends {goog.events.Event}
+ * @implements {oli.MapEvent}
+ * @param {string} type Event type.
+ * @param {ol.Map} map Map.
+ * @param {?olx.FrameState=} opt_frameState Frame state.
+ */
+ol.MapEvent = function(type, map, opt_frameState) {
+
+  goog.base(this, type);
+
+  /**
+   * The map where the event occurred.
+   * @type {ol.Map}
+   * @api stable
+   */
+  this.map = map;
+
+  /**
+   * The frame state at the time of the event.
+   * @type {?olx.FrameState}
+   * @api
+   */
+  this.frameState = opt_frameState !== undefined ? opt_frameState : null;
+
+};
+goog.inherits(ol.MapEvent, goog.events.Event);
+
+goog.provide('ol.control.Control');
+
+goog.require('goog.dom');
+goog.require('goog.events');
+goog.require('ol');
+goog.require('ol.MapEventType');
+goog.require('ol.Object');
+
+
+
+/**
+ * @classdesc
+ * A control is a visible widget with a DOM element in a fixed position on the
+ * screen. They can involve user input (buttons), or be informational only;
+ * the position is determined using CSS. By default these are placed in the
+ * container with CSS class name `ol-overlaycontainer-stopevent`, but can use
+ * any outside DOM element.
+ *
+ * This is the base class for controls. You can use it for simple custom
+ * controls by creating the element with listeners, creating an instance:
+ * ```js
+ * var myControl = new ol.control.Control({element: myElement});
+ * ```
+ * and then adding this to the map.
+ *
+ * The main advantage of having this as a control rather than a simple separate
+ * DOM element is that preventing propagation is handled for you. Controls
+ * will also be `ol.Object`s in a `ol.Collection`, so you can use their
+ * methods.
+ *
+ * You can also extend this base for your own control class. See
+ * examples/custom-controls for an example of how to do this.
+ *
+ * @constructor
+ * @extends {ol.Object}
+ * @implements {oli.control.Control}
+ * @param {olx.control.ControlOptions} options Control options.
+ * @api stable
+ */
+ol.control.Control = function(options) {
+
+  goog.base(this);
+
+  /**
+   * @protected
+   * @type {Element}
+   */
+  this.element = options.element ? options.element : null;
+
+  /**
+   * @private
+   * @type {Element}
+   */
+  this.target_ = null;
+
+  /**
+   * @private
+   * @type {ol.Map}
+   */
+  this.map_ = null;
+
+  /**
+   * @protected
+   * @type {!Array.<?number>}
+   */
+  this.listenerKeys = [];
+
+  /**
+   * @type {function(ol.MapEvent)}
+   */
+  this.render = options.render ? options.render : ol.nullFunction;
+
+  if (options.target) {
+    this.setTarget(options.target);
+  }
+
+};
+goog.inherits(ol.control.Control, ol.Object);
+
+
+/**
+ * @inheritDoc
+ */
+ol.control.Control.prototype.disposeInternal = function() {
+  goog.dom.removeNode(this.element);
+  goog.base(this, 'disposeInternal');
+};
+
+
+/**
+ * Get the map associated with this control.
+ * @return {ol.Map} Map.
+ * @api stable
+ */
+ol.control.Control.prototype.getMap = function() {
+  return this.map_;
+};
+
+
+/**
+ * Remove the control from its current map and attach it to the new map.
+ * Subclasses may set up event handlers to get notified about changes to
+ * the map here.
+ * @param {ol.Map} map Map.
+ * @api stable
+ */
+ol.control.Control.prototype.setMap = function(map) {
+  if (this.map_) {
+    goog.dom.removeNode(this.element);
+  }
+  if (this.listenerKeys.length > 0) {
+    this.listenerKeys.forEach(goog.events.unlistenByKey);
+    this.listenerKeys.length = 0;
+  }
+  this.map_ = map;
+  if (this.map_) {
+    var target = this.target_ ?
+        this.target_ : map.getOverlayContainerStopEvent();
+    target.appendChild(this.element);
+    if (this.render !== ol.nullFunction) {
+      this.listenerKeys.push(goog.events.listen(map,
+          ol.MapEventType.POSTRENDER, this.render, false, this));
+    }
+    map.render();
+  }
+};
+
+
+/**
+ * This function is used to set a target element for the control. It has no
+ * effect if it is called after the control has been added to the map (i.e.
+ * after `setMap` is called on the control). If no `target` is set in the
+ * options passed to the control constructor and if `setTarget` is not called
+ * then the control is added to the map's overlay container.
+ * @param {Element|string} target Target.
+ * @api
+ */
+ol.control.Control.prototype.setTarget = function(target) {
+  this.target_ = goog.dom.getElement(target);
+};
+
+goog.provide('ol.css');
+
+
+/**
+ * The CSS class for hidden feature.
+ *
+ * @const
+ * @type {string}
+ */
+ol.css.CLASS_HIDDEN = 'ol-hidden';
+
+
+/**
+ * The CSS class that we'll give the DOM elements to have them unselectable.
+ *
+ * @const
+ * @type {string}
+ */
+ol.css.CLASS_UNSELECTABLE = 'ol-unselectable';
+
+
+/**
+ * The CSS class for unsupported feature.
+ *
+ * @const
+ * @type {string}
+ */
+ol.css.CLASS_UNSUPPORTED = 'ol-unsupported';
+
+
+/**
+ * The CSS class for controls.
+ *
+ * @const
+ * @type {string}
+ */
+ol.css.CLASS_CONTROL = 'ol-control';
+
+goog.provide('ol.structs.LRUCache');
+
+goog.require('goog.asserts');
+goog.require('goog.object');
+
+
+
+/**
+ * Implements a Least-Recently-Used cache where the keys do not conflict with
+ * Object's properties (e.g. 'hasOwnProperty' is not allowed as a key). Expiring
+ * items from the cache is the responsibility of the user.
+ * @constructor
+ * @struct
+ * @template T
+ */
+ol.structs.LRUCache = function() {
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.count_ = 0;
+
+  /**
+   * @private
+   * @type {Object.<string, ol.structs.LRUCacheEntry>}
+   */
+  this.entries_ = {};
+
+  /**
+   * @private
+   * @type {?ol.structs.LRUCacheEntry}
+   */
+  this.oldest_ = null;
+
+  /**
+   * @private
+   * @type {?ol.structs.LRUCacheEntry}
+   */
+  this.newest_ = null;
+
+};
+
+
+/**
+ * FIXME empty description for jsdoc
+ */
+ol.structs.LRUCache.prototype.assertValid = function() {
+  if (this.count_ === 0) {
+    goog.asserts.assert(goog.object.isEmpty(this.entries_),
+        'entries must be an empty object (count = 0)');
+    goog.asserts.assert(!this.oldest_,
+        'oldest must be null (count = 0)');
+    goog.asserts.assert(!this.newest_,
+        'newest must be null (count = 0)');
+  } else {
+    goog.asserts.assert(goog.object.getCount(this.entries_) == this.count_,
+        'number of entries matches count');
+    goog.asserts.assert(this.oldest_,
+        'we have an oldest entry');
+    goog.asserts.assert(!this.oldest_.older,
+        'no entry is older than oldest');
+    goog.asserts.assert(this.newest_,
+        'we have a newest entry');
+    goog.asserts.assert(!this.newest_.newer,
+        'no entry is newer than newest');
+    var i, entry;
+    var older = null;
+    i = 0;
+    for (entry = this.oldest_; entry; entry = entry.newer) {
+      goog.asserts.assert(entry.older === older,
+          'entry.older links to correct older');
+      older = entry;
+      ++i;
+    }
+    goog.asserts.assert(i == this.count_, 'iterated correct amount of times');
+    var newer = null;
+    i = 0;
+    for (entry = this.newest_; entry; entry = entry.older) {
+      goog.asserts.assert(entry.newer === newer,
+          'entry.newer links to correct newer');
+      newer = entry;
+      ++i;
+    }
+    goog.asserts.assert(i == this.count_, 'iterated correct amount of times');
+  }
+};
+
+
+/**
+ * FIXME empty description for jsdoc
+ */
+ol.structs.LRUCache.prototype.clear = function() {
+  this.count_ = 0;
+  this.entries_ = {};
+  this.oldest_ = null;
+  this.newest_ = null;
+};
+
+
+/**
+ * @param {string} key Key.
+ * @return {boolean} Contains key.
+ */
+ol.structs.LRUCache.prototype.containsKey = function(key) {
+  return this.entries_.hasOwnProperty(key);
+};
+
+
+/**
+ * @param {function(this: S, T, string, ol.structs.LRUCache): ?} f The function
+ *     to call for every entry from the oldest to the newer. This function takes
+ *     3 arguments (the entry value, the entry key and the LRUCache object).
+ *     The return value is ignored.
+ * @param {S=} opt_this The object to use as `this` in `f`.
+ * @template S
+ */
+ol.structs.LRUCache.prototype.forEach = function(f, opt_this) {
+  var entry = this.oldest_;
+  while (entry) {
+    f.call(opt_this, entry.value_, entry.key_, this);
+    entry = entry.newer;
+  }
+};
+
+
+/**
+ * @param {string} key Key.
+ * @return {T} Value.
+ */
+ol.structs.LRUCache.prototype.get = function(key) {
+  var entry = this.entries_[key];
+  goog.asserts.assert(entry !== undefined, 'an entry exists for key %s', key);
+  if (entry === this.newest_) {
+    return entry.value_;
+  } else if (entry === this.oldest_) {
+    this.oldest_ = this.oldest_.newer;
+    this.oldest_.older = null;
+  } else {
+    entry.newer.older = entry.older;
+    entry.older.newer = entry.newer;
+  }
+  entry.newer = null;
+  entry.older = this.newest_;
+  this.newest_.newer = entry;
+  this.newest_ = entry;
+  return entry.value_;
+};
+
+
+/**
+ * @return {number} Count.
+ */
+ol.structs.LRUCache.prototype.getCount = function() {
+  return this.count_;
+};
+
+
+/**
+ * @return {Array.<string>} Keys.
+ */
+ol.structs.LRUCache.prototype.getKeys = function() {
+  var keys = new Array(this.count_);
+  var i = 0;
+  var entry;
+  for (entry = this.newest_; entry; entry = entry.older) {
+    keys[i++] = entry.key_;
+  }
+  goog.asserts.assert(i == this.count_, 'iterated correct number of times');
+  return keys;
+};
+
+
+/**
+ * @return {Array.<T>} Values.
+ */
+ol.structs.LRUCache.prototype.getValues = function() {
+  var values = new Array(this.count_);
+  var i = 0;
+  var entry;
+  for (entry = this.newest_; entry; entry = entry.older) {
+    values[i++] = entry.value_;
+  }
+  goog.asserts.assert(i == this.count_, 'iterated correct number of times');
+  return values;
+};
+
+
+/**
+ * @return {T} Last value.
+ */
+ol.structs.LRUCache.prototype.peekLast = function() {
+  goog.asserts.assert(this.oldest_, 'oldest must not be null');
+  return this.oldest_.value_;
+};
+
+
+/**
+ * @return {string} Last key.
+ */
+ol.structs.LRUCache.prototype.peekLastKey = function() {
+  goog.asserts.assert(this.oldest_, 'oldest must not be null');
+  return this.oldest_.key_;
+};
+
+
+/**
+ * @return {T} value Value.
+ */
+ol.structs.LRUCache.prototype.pop = function() {
+  goog.asserts.assert(this.oldest_, 'oldest must not be null');
+  goog.asserts.assert(this.newest_, 'newest must not be null');
+  var entry = this.oldest_;
+  goog.asserts.assert(entry.key_ in this.entries_,
+      'oldest is indexed in entries');
+  delete this.entries_[entry.key_];
+  if (entry.newer) {
+    entry.newer.older = null;
+  }
+  this.oldest_ = entry.newer;
+  if (!this.oldest_) {
+    this.newest_ = null;
+  }
+  --this.count_;
+  return entry.value_;
+};
+
+
+/**
+ * @param {string} key Key.
+ * @param {T} value Value.
+ */
+ol.structs.LRUCache.prototype.replace = function(key, value) {
+  this.get(key);  // update `newest_`
+  this.entries_[key].value_ = value;
+};
+
+
+/**
+ * @param {string} key Key.
+ * @param {T} value Value.
+ */
+ol.structs.LRUCache.prototype.set = function(key, value) {
+  goog.asserts.assert(!(key in {}),
+      'key is not a standard property of objects (e.g. "__proto__")');
+  goog.asserts.assert(!(key in this.entries_),
+      'key is not used already');
+  var entry = {
+    key_: key,
+    newer: null,
+    older: this.newest_,
+    value_: value
+  };
+  if (!this.newest_) {
+    this.oldest_ = entry;
+  } else {
+    this.newest_.newer = entry;
+  }
+  this.newest_ = entry;
+  this.entries_[key] = entry;
+  ++this.count_;
+};
+
+
+/**
+ * @typedef {{key_: string,
+ *            newer: ol.structs.LRUCacheEntry,
+ *            older: ol.structs.LRUCacheEntry,
+ *            value_: *}}
+ */
+ol.structs.LRUCacheEntry;
+
+goog.provide('ol.TileCache');
+
+goog.require('ol');
+goog.require('ol.TileRange');
+goog.require('ol.structs.LRUCache');
+goog.require('ol.tilecoord');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.structs.LRUCache.<ol.Tile>}
+ * @param {number=} opt_highWaterMark High water mark.
+ * @struct
+ */
+ol.TileCache = function(opt_highWaterMark) {
+
+  goog.base(this);
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.highWaterMark_ = opt_highWaterMark !== undefined ?
+      opt_highWaterMark : ol.DEFAULT_TILE_CACHE_HIGH_WATER_MARK;
+
+};
+goog.inherits(ol.TileCache, ol.structs.LRUCache);
+
+
+/**
+ * @return {boolean} Can expire cache.
+ */
+ol.TileCache.prototype.canExpireCache = function() {
+  return this.getCount() > this.highWaterMark_;
+};
+
+
+/**
+ * @param {Object.<string, ol.TileRange>} usedTiles Used tiles.
+ */
+ol.TileCache.prototype.expireCache = function(usedTiles) {
+  var tile, zKey;
+  while (this.canExpireCache()) {
+    tile = this.peekLast();
+    zKey = tile.tileCoord[0].toString();
+    if (zKey in usedTiles && usedTiles[zKey].contains(tile.tileCoord)) {
+      break;
+    } else {
+      this.pop().dispose();
+    }
+  }
+};
+
+
+/**
+ * Remove a tile range from the cache, e.g. to invalidate tiles.
+ * @param {ol.TileRange} tileRange The tile range to prune.
+ */
+ol.TileCache.prototype.pruneTileRange = function(tileRange) {
+  var i = this.getCount(),
+      key;
+  while (i--) {
+    key = this.peekLastKey();
+    if (tileRange.contains(ol.tilecoord.createFromString(key))) {
+      this.pop().dispose();
+    } else {
+      this.get(key);
+    }
+  }
+};
+
+goog.provide('ol.Tile');
+goog.provide('ol.TileState');
+
+goog.require('goog.events');
+goog.require('goog.events.EventTarget');
+goog.require('goog.events.EventType');
+goog.require('ol.TileCoord');
+
+
+/**
+ * @enum {number}
+ */
+ol.TileState = {
+  IDLE: 0,
+  LOADING: 1,
+  LOADED: 2,
+  ERROR: 3,
+  EMPTY: 4
+};
+
+
+
+/**
+ * @classdesc
+ * Base class for tiles.
+ *
+ * @constructor
+ * @extends {goog.events.EventTarget}
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {ol.TileState} state State.
+ */
+ol.Tile = function(tileCoord, state) {
+
+  goog.base(this);
+
+  /**
+   * @type {ol.TileCoord}
+   */
+  this.tileCoord = tileCoord;
+
+  /**
+   * @protected
+   * @type {ol.TileState}
+   */
+  this.state = state;
+
+  /**
+   * An "interim" tile for this tile. The interim tile may be used while this
+   * one is loading, for "smooth" transitions when changing params/dimensions
+   * on the source.
+   * @type {ol.Tile}
+   */
+  this.interimTile = null;
+
+  /**
+   * A key assigned to the tile. This is used by the tile source to determine
+   * if this tile can effectively be used, or if a new tile should be created
+   * and this one be used as an interim tile for this new tile.
+   * @type {string}
+   */
+  this.key = '';
+
+};
+goog.inherits(ol.Tile, goog.events.EventTarget);
+
+
+/**
+ * @protected
+ */
+ol.Tile.prototype.changed = function() {
+  this.dispatchEvent(goog.events.EventType.CHANGE);
+};
+
+
+/**
+ * Get the HTML image element for this tile (may be a Canvas, Image, or Video).
+ * @function
+ * @param {Object=} opt_context Object.
+ * @return {HTMLCanvasElement|HTMLImageElement|HTMLVideoElement} Image.
+ */
+ol.Tile.prototype.getImage = goog.abstractMethod;
+
+
+/**
+ * @return {string} Key.
+ */
+ol.Tile.prototype.getKey = function() {
+  return goog.getUid(this).toString();
+};
+
+
+/**
+ * Get the tile coordinate for this tile.
+ * @return {ol.TileCoord}
+ * @api
+ */
+ol.Tile.prototype.getTileCoord = function() {
+  return this.tileCoord;
+};
+
+
+/**
+ * @return {ol.TileState} State.
+ */
+ol.Tile.prototype.getState = function() {
+  return this.state;
+};
+
+
+/**
+ * FIXME empty description for jsdoc
+ */
+ol.Tile.prototype.load = goog.abstractMethod;
+
+goog.provide('ol.source.Source');
+goog.provide('ol.source.State');
+
+goog.require('ol');
+goog.require('ol.Attribution');
+goog.require('ol.Object');
+goog.require('ol.proj');
+
+
+/**
+ * State of the source, one of 'undefined', 'loading', 'ready' or 'error'.
+ * @enum {string}
+ * @api
+ */
+ol.source.State = {
+  UNDEFINED: 'undefined',
+  LOADING: 'loading',
+  READY: 'ready',
+  ERROR: 'error'
+};
+
+
+/**
+ * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
+ *            logo: (string|olx.LogoOptions|undefined),
+ *            projection: ol.proj.ProjectionLike,
+ *            state: (ol.source.State|undefined),
+ *            wrapX: (boolean|undefined)}}
+ */
+ol.source.SourceOptions;
+
+
+
+/**
+ * @classdesc
+ * Abstract base class; normally only used for creating subclasses and not
+ * instantiated in apps.
+ * Base class for {@link ol.layer.Layer} sources.
+ *
+ * A generic `change` event is triggered when the state of the source changes.
+ *
+ * @constructor
+ * @extends {ol.Object}
+ * @param {ol.source.SourceOptions} options Source options.
+ * @api stable
+ */
+ol.source.Source = function(options) {
+
+  goog.base(this);
+
+  /**
+   * @private
+   * @type {ol.proj.Projection}
+   */
+  this.projection_ = ol.proj.get(options.projection);
+
+  /**
+   * @private
+   * @type {Array.<ol.Attribution>}
+   */
+  this.attributions_ = options.attributions !== undefined ?
+      options.attributions : null;
+
+  /**
+   * @private
+   * @type {string|olx.LogoOptions|undefined}
+   */
+  this.logo_ = options.logo;
+
+  /**
+   * @private
+   * @type {ol.source.State}
+   */
+  this.state_ = options.state !== undefined ?
+      options.state : ol.source.State.READY;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.wrapX_ = options.wrapX !== undefined ? options.wrapX : false;
+
+};
+goog.inherits(ol.source.Source, ol.Object);
+
+
+/**
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {number} resolution Resolution.
+ * @param {number} rotation Rotation.
+ * @param {Object.<string, boolean>} skippedFeatureUids Skipped feature uids.
+ * @param {function((ol.Feature|ol.render.Feature)): T} callback Feature
+ *     callback.
+ * @return {T|undefined} Callback result.
+ * @template T
+ */
+ol.source.Source.prototype.forEachFeatureAtCoordinate = ol.nullFunction;
+
+
+/**
+ * Get the attributions of the source.
+ * @return {Array.<ol.Attribution>} Attributions.
+ * @api stable
+ */
+ol.source.Source.prototype.getAttributions = function() {
+  return this.attributions_;
+};
+
+
+/**
+ * Get the logo of the source.
+ * @return {string|olx.LogoOptions|undefined} Logo.
+ * @api stable
+ */
+ol.source.Source.prototype.getLogo = function() {
+  return this.logo_;
+};
+
+
+/**
+ * Get the projection of the source.
+ * @return {ol.proj.Projection} Projection.
+ * @api
+ */
+ol.source.Source.prototype.getProjection = function() {
+  return this.projection_;
+};
+
+
+/**
+ * @return {Array.<number>|undefined} Resolutions.
+ */
+ol.source.Source.prototype.getResolutions = goog.abstractMethod;
+
+
+/**
+ * Get the state of the source, see {@link ol.source.State} for possible states.
+ * @return {ol.source.State} State.
+ * @api
+ */
+ol.source.Source.prototype.getState = function() {
+  return this.state_;
+};
+
+
+/**
+ * @return {boolean|undefined} Wrap X.
+ */
+ol.source.Source.prototype.getWrapX = function() {
+  return this.wrapX_;
+};
+
+
+/**
+ * Set the attributions of the source.
+ * @param {Array.<ol.Attribution>} attributions Attributions.
+ * @api
+ */
+ol.source.Source.prototype.setAttributions = function(attributions) {
+  this.attributions_ = attributions;
+  this.changed();
+};
+
+
+/**
+ * Set the logo of the source.
+ * @param {string|olx.LogoOptions|undefined} logo Logo.
+ */
+ol.source.Source.prototype.setLogo = function(logo) {
+  this.logo_ = logo;
+};
+
+
+/**
+ * Set the state of the source.
+ * @param {ol.source.State} state State.
+ * @protected
+ */
+ol.source.Source.prototype.setState = function(state) {
+  this.state_ = state;
+  this.changed();
+};
+
+
+/**
+ * Set the projection of the source.
+ * @param {ol.proj.Projection} projection Projection.
+ */
+ol.source.Source.prototype.setProjection = function(projection) {
+  this.projection_ = projection;
+};
+
+goog.provide('ol.tilegrid.TileGrid');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.Coordinate');
+goog.require('ol.TileCoord');
+goog.require('ol.TileRange');
+goog.require('ol.array');
+goog.require('ol.extent');
+goog.require('ol.extent.Corner');
+goog.require('ol.math');
+goog.require('ol.proj');
+goog.require('ol.proj.METERS_PER_UNIT');
+goog.require('ol.proj.Projection');
+goog.require('ol.proj.Units');
+goog.require('ol.size');
+goog.require('ol.tilecoord');
+
+
+
+/**
+ * @classdesc
+ * Base class for setting the grid pattern for sources accessing tiled-image
+ * servers.
+ *
+ * @constructor
+ * @param {olx.tilegrid.TileGridOptions} options Tile grid options.
+ * @struct
+ * @api stable
+ */
+ol.tilegrid.TileGrid = function(options) {
+
+  /**
+   * @protected
+   * @type {number}
+   */
+  this.minZoom = options.minZoom !== undefined ? options.minZoom : 0;
+
+  /**
+   * @private
+   * @type {!Array.<number>}
+   */
+  this.resolutions_ = options.resolutions;
+  goog.asserts.assert(goog.array.isSorted(this.resolutions_, function(a, b) {
+    return b - a;
+  }, true), 'resolutions must be sorted in descending order');
+
+  /**
+   * @protected
+   * @type {number}
+   */
+  this.maxZoom = this.resolutions_.length - 1;
+
+  /**
+   * @private
+   * @type {ol.Coordinate}
+   */
+  this.origin_ = options.origin !== undefined ? options.origin : null;
+
+  /**
+   * @private
+   * @type {Array.<ol.Coordinate>}
+   */
+  this.origins_ = null;
+  if (options.origins !== undefined) {
+    this.origins_ = options.origins;
+    goog.asserts.assert(this.origins_.length == this.resolutions_.length,
+        'number of origins and resolutions must be equal');
+  }
+
+  var extent = options.extent;
+
+  if (extent !== undefined &&
+      !this.origin_ && !this.origins_) {
+    this.origin_ = ol.extent.getTopLeft(extent);
+  }
+
+  goog.asserts.assert(
+      (!this.origin_ && this.origins_) ||
+      (this.origin_ && !this.origins_),
+      'either origin or origins must be configured, never both');
+
+  /**
+   * @private
+   * @type {Array.<number|ol.Size>}
+   */
+  this.tileSizes_ = null;
+  if (options.tileSizes !== undefined) {
+    this.tileSizes_ = options.tileSizes;
+    goog.asserts.assert(this.tileSizes_.length == this.resolutions_.length,
+        'number of tileSizes and resolutions must be equal');
+  }
+
+  /**
+   * @private
+   * @type {number|ol.Size}
+   */
+  this.tileSize_ = options.tileSize !== undefined ?
+      options.tileSize :
+      !this.tileSizes_ ? ol.DEFAULT_TILE_SIZE : null;
+  goog.asserts.assert(
+      (!this.tileSize_ && this.tileSizes_) ||
+      (this.tileSize_ && !this.tileSizes_),
+      'either tileSize or tileSizes must be configured, never both');
+
+  /**
+   * @private
+   * @type {ol.Extent}
+   */
+  this.extent_ = extent !== undefined ? extent : null;
+
+
+  /**
+   * @private
+   * @type {Array.<ol.TileRange>}
+   */
+  this.fullTileRanges_ = null;
+
+  if (options.sizes !== undefined) {
+    goog.asserts.assert(options.sizes.length == this.resolutions_.length,
+        'number of sizes and resolutions must be equal');
+    this.fullTileRanges_ = options.sizes.map(function(size, z) {
+      goog.asserts.assert(size[0] !== 0, 'width must not be 0');
+      goog.asserts.assert(size[1] !== 0, 'height must not be 0');
+      var tileRange = new ol.TileRange(
+          Math.min(0, size[0]), Math.max(size[0] - 1, -1),
+          Math.min(0, size[1]), Math.max(size[1] - 1, -1));
+      if (this.minZoom <= z && z <= this.maxZoom && extent !== undefined) {
+        goog.asserts.assert(tileRange.containsTileRange(
+            this.getTileRangeForExtentAndZ(extent, z)),
+            'extent tile range must not exceed tilegrid width and height');
+      }
+      return tileRange;
+    }, this);
+  } else if (extent) {
+    this.calculateTileRanges_(extent);
+  }
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.tmpSize_ = [0, 0];
+
+};
+
+
+/**
+ * @private
+ * @type {ol.TileCoord}
+ */
+ol.tilegrid.TileGrid.tmpTileCoord_ = [0, 0, 0];
+
+
+/**
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {function(this: T, number, ol.TileRange): boolean} callback Callback.
+ * @param {T=} opt_this The object to use as `this` in `callback`.
+ * @param {ol.TileRange=} opt_tileRange Temporary ol.TileRange object.
+ * @param {ol.Extent=} opt_extent Temporary ol.Extent object.
+ * @return {boolean} Callback succeeded.
+ * @template T
+ */
+ol.tilegrid.TileGrid.prototype.forEachTileCoordParentTileRange =
+    function(tileCoord, callback, opt_this, opt_tileRange, opt_extent) {
+  var tileCoordExtent = this.getTileCoordExtent(tileCoord, opt_extent);
+  var z = tileCoord[0] - 1;
+  while (z >= this.minZoom) {
+    if (callback.call(opt_this, z,
+        this.getTileRangeForExtentAndZ(tileCoordExtent, z, opt_tileRange))) {
+      return true;
+    }
+    --z;
+  }
+  return false;
+};
+
+
+/**
+ * Get the extent for this tile grid, if it was configured.
+ * @return {ol.Extent} Extent.
+ */
+ol.tilegrid.TileGrid.prototype.getExtent = function() {
+  return this.extent_;
+};
+
+
+/**
+ * Get the maximum zoom level for the grid.
+ * @return {number} Max zoom.
+ * @api
+ */
+ol.tilegrid.TileGrid.prototype.getMaxZoom = function() {
+  return this.maxZoom;
+};
+
+
+/**
+ * Get the minimum zoom level for the grid.
+ * @return {number} Min zoom.
+ * @api
+ */
+ol.tilegrid.TileGrid.prototype.getMinZoom = function() {
+  return this.minZoom;
+};
+
+
+/**
+ * Get the origin for the grid at the given zoom level.
+ * @param {number} z Z.
+ * @return {ol.Coordinate} Origin.
+ * @api stable
+ */
+ol.tilegrid.TileGrid.prototype.getOrigin = function(z) {
+  if (this.origin_) {
+    return this.origin_;
+  } else {
+    goog.asserts.assert(this.origins_,
+        'origins cannot be null if origin is null');
+    goog.asserts.assert(this.minZoom <= z && z <= this.maxZoom,
+        'given z is not in allowed range (%s <= %s <= %s)',
+        this.minZoom, z, this.maxZoom);
+    return this.origins_[z];
+  }
+};
+
+
+/**
+ * Get the resolution for the given zoom level.
+ * @param {number} z Z.
+ * @return {number} Resolution.
+ * @api stable
+ */
+ol.tilegrid.TileGrid.prototype.getResolution = function(z) {
+  goog.asserts.assert(this.minZoom <= z && z <= this.maxZoom,
+      'given z is not in allowed range (%s <= %s <= %s)',
+      this.minZoom, z, this.maxZoom);
+  return this.resolutions_[z];
+};
+
+
+/**
+ * Get the list of resolutions for the tile grid.
+ * @return {Array.<number>} Resolutions.
+ * @api stable
+ */
+ol.tilegrid.TileGrid.prototype.getResolutions = function() {
+  return this.resolutions_;
+};
+
+
+/**
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {ol.TileRange=} opt_tileRange Temporary ol.TileRange object.
+ * @param {ol.Extent=} opt_extent Temporary ol.Extent object.
+ * @return {ol.TileRange} Tile range.
+ */
+ol.tilegrid.TileGrid.prototype.getTileCoordChildTileRange =
+    function(tileCoord, opt_tileRange, opt_extent) {
+  if (tileCoord[0] < this.maxZoom) {
+    var tileCoordExtent = this.getTileCoordExtent(tileCoord, opt_extent);
+    return this.getTileRangeForExtentAndZ(
+        tileCoordExtent, tileCoord[0] + 1, opt_tileRange);
+  } else {
+    return null;
+  }
+};
+
+
+/**
+ * @param {number} z Z.
+ * @param {ol.TileRange} tileRange Tile range.
+ * @param {ol.Extent=} opt_extent Temporary ol.Extent object.
+ * @return {ol.Extent} Extent.
+ */
+ol.tilegrid.TileGrid.prototype.getTileRangeExtent =
+    function(z, tileRange, opt_extent) {
+  var origin = this.getOrigin(z);
+  var resolution = this.getResolution(z);
+  var tileSize = ol.size.toSize(this.getTileSize(z), this.tmpSize_);
+  var minX = origin[0] + tileRange.minX * tileSize[0] * resolution;
+  var maxX = origin[0] + (tileRange.maxX + 1) * tileSize[0] * resolution;
+  var minY = origin[1] + tileRange.minY * tileSize[1] * resolution;
+  var maxY = origin[1] + (tileRange.maxY + 1) * tileSize[1] * resolution;
+  return ol.extent.createOrUpdate(minX, minY, maxX, maxY, opt_extent);
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {number} resolution Resolution.
+ * @param {ol.TileRange=} opt_tileRange Temporary tile range object.
+ * @return {ol.TileRange} Tile range.
+ */
+ol.tilegrid.TileGrid.prototype.getTileRangeForExtentAndResolution =
+    function(extent, resolution, opt_tileRange) {
+  var tileCoord = ol.tilegrid.TileGrid.tmpTileCoord_;
+  this.getTileCoordForXYAndResolution_(
+      extent[0], extent[1], resolution, false, tileCoord);
+  var minX = tileCoord[1];
+  var minY = tileCoord[2];
+  this.getTileCoordForXYAndResolution_(
+      extent[2], extent[3], resolution, true, tileCoord);
+  return ol.TileRange.createOrUpdate(
+      minX, tileCoord[1], minY, tileCoord[2], opt_tileRange);
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {number} z Z.
+ * @param {ol.TileRange=} opt_tileRange Temporary tile range object.
+ * @return {ol.TileRange} Tile range.
+ */
+ol.tilegrid.TileGrid.prototype.getTileRangeForExtentAndZ =
+    function(extent, z, opt_tileRange) {
+  var resolution = this.getResolution(z);
+  return this.getTileRangeForExtentAndResolution(
+      extent, resolution, opt_tileRange);
+};
+
+
+/**
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @return {ol.Coordinate} Tile center.
+ */
+ol.tilegrid.TileGrid.prototype.getTileCoordCenter = function(tileCoord) {
+  var origin = this.getOrigin(tileCoord[0]);
+  var resolution = this.getResolution(tileCoord[0]);
+  var tileSize = ol.size.toSize(this.getTileSize(tileCoord[0]), this.tmpSize_);
+  return [
+    origin[0] + (tileCoord[1] + 0.5) * tileSize[0] * resolution,
+    origin[1] + (tileCoord[2] + 0.5) * tileSize[1] * resolution
+  ];
+};
+
+
+/**
+ * Get the extent of a tile coordinate.
+ *
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {ol.Extent=} opt_extent Temporary extent object.
+ * @return {ol.Extent} Extent.
+ * @api
+ */
+ol.tilegrid.TileGrid.prototype.getTileCoordExtent =
+    function(tileCoord, opt_extent) {
+  var origin = this.getOrigin(tileCoord[0]);
+  var resolution = this.getResolution(tileCoord[0]);
+  var tileSize = ol.size.toSize(this.getTileSize(tileCoord[0]), this.tmpSize_);
+  var minX = origin[0] + tileCoord[1] * tileSize[0] * resolution;
+  var minY = origin[1] + tileCoord[2] * tileSize[1] * resolution;
+  var maxX = minX + tileSize[0] * resolution;
+  var maxY = minY + tileSize[1] * resolution;
+  return ol.extent.createOrUpdate(minX, minY, maxX, maxY, opt_extent);
+};
+
+
+/**
+ * Get the tile coordinate for the given map coordinate and resolution.  This
+ * method considers that coordinates that intersect tile boundaries should be
+ * assigned the higher tile coordinate.
+ *
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {number} resolution Resolution.
+ * @param {ol.TileCoord=} opt_tileCoord Destination ol.TileCoord object.
+ * @return {ol.TileCoord} Tile coordinate.
+ * @api
+ */
+ol.tilegrid.TileGrid.prototype.getTileCoordForCoordAndResolution =
+    function(coordinate, resolution, opt_tileCoord) {
+  return this.getTileCoordForXYAndResolution_(
+      coordinate[0], coordinate[1], resolution, false, opt_tileCoord);
+};
+
+
+/**
+ * @param {number} x X.
+ * @param {number} y Y.
+ * @param {number} resolution Resolution.
+ * @param {boolean} reverseIntersectionPolicy Instead of letting edge
+ *     intersections go to the higher tile coordinate, let edge intersections
+ *     go to the lower tile coordinate.
+ * @param {ol.TileCoord=} opt_tileCoord Temporary ol.TileCoord object.
+ * @return {ol.TileCoord} Tile coordinate.
+ * @private
+ */
+ol.tilegrid.TileGrid.prototype.getTileCoordForXYAndResolution_ = function(
+    x, y, resolution, reverseIntersectionPolicy, opt_tileCoord) {
+  var z = this.getZForResolution(resolution);
+  var scale = resolution / this.getResolution(z);
+  var origin = this.getOrigin(z);
+  var tileSize = ol.size.toSize(this.getTileSize(z), this.tmpSize_);
+
+  var adjustX = reverseIntersectionPolicy ? 0.5 : 0;
+  var adjustY = reverseIntersectionPolicy ? 0 : 0.5;
+  var xFromOrigin = Math.floor((x - origin[0]) / resolution + adjustX);
+  var yFromOrigin = Math.floor((y - origin[1]) / resolution + adjustY);
+  var tileCoordX = scale * xFromOrigin / tileSize[0];
+  var tileCoordY = scale * yFromOrigin / tileSize[1];
+
+  if (reverseIntersectionPolicy) {
+    tileCoordX = Math.ceil(tileCoordX) - 1;
+    tileCoordY = Math.ceil(tileCoordY) - 1;
+  } else {
+    tileCoordX = Math.floor(tileCoordX);
+    tileCoordY = Math.floor(tileCoordY);
+  }
+
+  return ol.tilecoord.createOrUpdate(z, tileCoordX, tileCoordY, opt_tileCoord);
+};
+
+
+/**
+ * Get a tile coordinate given a map coordinate and zoom level.
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {number} z Zoom level.
+ * @param {ol.TileCoord=} opt_tileCoord Destination ol.TileCoord object.
+ * @return {ol.TileCoord} Tile coordinate.
+ * @api
+ */
+ol.tilegrid.TileGrid.prototype.getTileCoordForCoordAndZ =
+    function(coordinate, z, opt_tileCoord) {
+  var resolution = this.getResolution(z);
+  return this.getTileCoordForXYAndResolution_(
+      coordinate[0], coordinate[1], resolution, false, opt_tileCoord);
+};
+
+
+/**
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @return {number} Tile resolution.
+ */
+ol.tilegrid.TileGrid.prototype.getTileCoordResolution = function(tileCoord) {
+  goog.asserts.assert(
+      this.minZoom <= tileCoord[0] && tileCoord[0] <= this.maxZoom,
+      'z of given tilecoord is not in allowed range (%s <= %s <= %s',
+      this.minZoom, tileCoord[0], this.maxZoom);
+  return this.resolutions_[tileCoord[0]];
+};
+
+
+/**
+ * Get the tile size for a zoom level. The type of the return value matches the
+ * `tileSize` or `tileSizes` that the tile grid was configured with. To always
+ * get an `ol.Size`, run the result through `ol.size.toSize()`.
+ * @param {number} z Z.
+ * @return {number|ol.Size} Tile size.
+ * @api stable
+ */
+ol.tilegrid.TileGrid.prototype.getTileSize = function(z) {
+  if (this.tileSize_) {
+    return this.tileSize_;
+  } else {
+    goog.asserts.assert(this.tileSizes_,
+        'tileSizes cannot be null if tileSize is null');
+    goog.asserts.assert(this.minZoom <= z && z <= this.maxZoom,
+        'z is not in allowed range (%s <= %s <= %s',
+        this.minZoom, z, this.maxZoom);
+    return this.tileSizes_[z];
+  }
+};
+
+
+/**
+ * @param {number} z Zoom level.
+ * @return {ol.TileRange} Extent tile range for the specified zoom level.
+ */
+ol.tilegrid.TileGrid.prototype.getFullTileRange = function(z) {
+  if (!this.fullTileRanges_) {
+    return null;
+  } else {
+    goog.asserts.assert(this.minZoom <= z && z <= this.maxZoom,
+        'z is not in allowed range (%s <= %s <= %s',
+        this.minZoom, z, this.maxZoom);
+    return this.fullTileRanges_[z];
+  }
+};
+
+
+/**
+ * @param {number} resolution Resolution.
+ * @return {number} Z.
+ */
+ol.tilegrid.TileGrid.prototype.getZForResolution = function(resolution) {
+  var z = ol.array.linearFindNearest(this.resolutions_, resolution, 0);
+  return ol.math.clamp(z, this.minZoom, this.maxZoom);
+};
+
+
+/**
+ * @param {!ol.Extent} extent Extent for this tile grid.
+ * @private
+ */
+ol.tilegrid.TileGrid.prototype.calculateTileRanges_ = function(extent) {
+  var length = this.resolutions_.length;
+  var fullTileRanges = new Array(length);
+  for (var z = this.minZoom; z < length; ++z) {
+    fullTileRanges[z] = this.getTileRangeForExtentAndZ(extent, z);
+  }
+  this.fullTileRanges_ = fullTileRanges;
+};
+
+
+/**
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {ol.tilegrid.TileGrid} Default tile grid for the passed projection.
+ */
+ol.tilegrid.getForProjection = function(projection) {
+  var tileGrid = projection.getDefaultTileGrid();
+  if (!tileGrid) {
+    tileGrid = ol.tilegrid.createForProjection(projection);
+    projection.setDefaultTileGrid(tileGrid);
+  }
+  return tileGrid;
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {number=} opt_maxZoom Maximum zoom level (default is
+ *     ol.DEFAULT_MAX_ZOOM).
+ * @param {number|ol.Size=} opt_tileSize Tile size (default uses
+ *     ol.DEFAULT_TILE_SIZE).
+ * @param {ol.extent.Corner=} opt_corner Extent corner (default is
+ *     ol.extent.Corner.TOP_LEFT).
+ * @return {ol.tilegrid.TileGrid} TileGrid instance.
+ */
+ol.tilegrid.createForExtent =
+    function(extent, opt_maxZoom, opt_tileSize, opt_corner) {
+  var corner = opt_corner !== undefined ?
+      opt_corner : ol.extent.Corner.TOP_LEFT;
+
+  var resolutions = ol.tilegrid.resolutionsFromExtent(
+      extent, opt_maxZoom, opt_tileSize);
+
+  return new ol.tilegrid.TileGrid({
+    extent: extent,
+    origin: ol.extent.getCorner(extent, corner),
+    resolutions: resolutions,
+    tileSize: opt_tileSize
+  });
+};
+
+
+/**
+ * Creates a tile grid with a standard XYZ tiling scheme.
+ * @param {olx.tilegrid.XYZOptions=} opt_options Tile grid options.
+ * @return {ol.tilegrid.TileGrid} Tile grid instance.
+ * @api
+ */
+ol.tilegrid.createXYZ = function(opt_options) {
+  var options = /** @type {olx.tilegrid.TileGridOptions} */ ({});
+  goog.object.extend(options, opt_options !== undefined ?
+      opt_options : /** @type {olx.tilegrid.XYZOptions} */ ({}));
+  if (options.extent === undefined) {
+    options.extent = ol.proj.get('EPSG:3857').getExtent();
+  }
+  options.resolutions = ol.tilegrid.resolutionsFromExtent(
+      options.extent, options.maxZoom, options.tileSize);
+  delete options.maxZoom;
+
+  return new ol.tilegrid.TileGrid(options);
+};
+
+
+/**
+ * Create a resolutions array from an extent.  A zoom factor of 2 is assumed.
+ * @param {ol.Extent} extent Extent.
+ * @param {number=} opt_maxZoom Maximum zoom level (default is
+ *     ol.DEFAULT_MAX_ZOOM).
+ * @param {number|ol.Size=} opt_tileSize Tile size (default uses
+ *     ol.DEFAULT_TILE_SIZE).
+ * @return {!Array.<number>} Resolutions array.
+ */
+ol.tilegrid.resolutionsFromExtent =
+    function(extent, opt_maxZoom, opt_tileSize) {
+  var maxZoom = opt_maxZoom !== undefined ?
+      opt_maxZoom : ol.DEFAULT_MAX_ZOOM;
+
+  var height = ol.extent.getHeight(extent);
+  var width = ol.extent.getWidth(extent);
+
+  var tileSize = ol.size.toSize(opt_tileSize !== undefined ?
+      opt_tileSize : ol.DEFAULT_TILE_SIZE);
+  var maxResolution = Math.max(
+      width / tileSize[0], height / tileSize[1]);
+
+  var length = maxZoom + 1;
+  var resolutions = new Array(length);
+  for (var z = 0; z < length; ++z) {
+    resolutions[z] = maxResolution / Math.pow(2, z);
+  }
+  return resolutions;
+};
+
+
+/**
+ * @param {ol.proj.ProjectionLike} projection Projection.
+ * @param {number=} opt_maxZoom Maximum zoom level (default is
+ *     ol.DEFAULT_MAX_ZOOM).
+ * @param {ol.Size=} opt_tileSize Tile size (default uses ol.DEFAULT_TILE_SIZE).
+ * @param {ol.extent.Corner=} opt_corner Extent corner (default is
+ *     ol.extent.Corner.BOTTOM_LEFT).
+ * @return {ol.tilegrid.TileGrid} TileGrid instance.
+ */
+ol.tilegrid.createForProjection =
+    function(projection, opt_maxZoom, opt_tileSize, opt_corner) {
+  var extent = ol.tilegrid.extentFromProjection(projection);
+  return ol.tilegrid.createForExtent(
+      extent, opt_maxZoom, opt_tileSize, opt_corner);
+};
+
+
+/**
+ * Generate a tile grid extent from a projection.  If the projection has an
+ * extent, it is used.  If not, a global extent is assumed.
+ * @param {ol.proj.ProjectionLike} projection Projection.
+ * @return {ol.Extent} Extent.
+ */
+ol.tilegrid.extentFromProjection = function(projection) {
+  projection = ol.proj.get(projection);
+  var extent = projection.getExtent();
+  if (!extent) {
+    var half = 180 * ol.proj.METERS_PER_UNIT[ol.proj.Units.DEGREES] /
+        projection.getMetersPerUnit();
+    extent = ol.extent.createOrUpdate(-half, -half, half, half);
+  }
+  return extent;
+};
+
+goog.provide('ol.source.Tile');
+goog.provide('ol.source.TileEvent');
+goog.provide('ol.source.TileOptions');
+
+goog.require('goog.asserts');
+goog.require('goog.events.Event');
+goog.require('ol');
+goog.require('ol.Attribution');
+goog.require('ol.Extent');
+goog.require('ol.TileCache');
+goog.require('ol.TileRange');
+goog.require('ol.TileState');
+goog.require('ol.proj');
+goog.require('ol.size');
+goog.require('ol.source.Source');
+goog.require('ol.tilecoord');
+goog.require('ol.tilegrid.TileGrid');
+
+
+/**
+ * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
+ *            cacheSize: (number|undefined),
+ *            extent: (ol.Extent|undefined),
+ *            logo: (string|olx.LogoOptions|undefined),
+ *            opaque: (boolean|undefined),
+ *            tilePixelRatio: (number|undefined),
+ *            projection: ol.proj.ProjectionLike,
+ *            state: (ol.source.State|undefined),
+ *            tileGrid: (ol.tilegrid.TileGrid|undefined),
+ *            wrapX: (boolean|undefined)}}
+ */
+ol.source.TileOptions;
+
+
+
+/**
+ * @classdesc
+ * Abstract base class; normally only used for creating subclasses and not
+ * instantiated in apps.
+ * Base class for sources providing images divided into a tile grid.
+ *
+ * @constructor
+ * @extends {ol.source.Source}
+ * @param {ol.source.TileOptions} options Tile source options.
+ * @api
+ */
+ol.source.Tile = function(options) {
+
+  goog.base(this, {
+    attributions: options.attributions,
+    extent: options.extent,
+    logo: options.logo,
+    projection: options.projection,
+    state: options.state,
+    wrapX: options.wrapX
+  });
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.opaque_ = options.opaque !== undefined ? options.opaque : false;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.tilePixelRatio_ = options.tilePixelRatio !== undefined ?
+      options.tilePixelRatio : 1;
+
+  /**
+   * @protected
+   * @type {ol.tilegrid.TileGrid}
+   */
+  this.tileGrid = options.tileGrid !== undefined ? options.tileGrid : null;
+
+  /**
+   * @protected
+   * @type {ol.TileCache}
+   */
+  this.tileCache = new ol.TileCache(options.cacheSize);
+
+  /**
+   * @protected
+   * @type {ol.Size}
+   */
+  this.tmpSize = [0, 0];
+
+};
+goog.inherits(ol.source.Tile, ol.source.Source);
+
+
+/**
+ * @return {boolean} Can expire cache.
+ */
+ol.source.Tile.prototype.canExpireCache = function() {
+  return this.tileCache.canExpireCache();
+};
+
+
+/**
+ * @param {ol.proj.Projection} projection Projection.
+ * @param {Object.<string, ol.TileRange>} usedTiles Used tiles.
+ */
+ol.source.Tile.prototype.expireCache = function(projection, usedTiles) {
+  var tileCache = this.getTileCacheForProjection(projection);
+  if (tileCache) {
+    tileCache.expireCache(usedTiles);
+  }
+};
+
+
+/**
+ * @param {ol.proj.Projection} projection Projection.
+ * @param {number} z Zoom level.
+ * @param {ol.TileRange} tileRange Tile range.
+ * @param {function(ol.Tile):(boolean|undefined)} callback Called with each
+ *     loaded tile.  If the callback returns `false`, the tile will not be
+ *     considered loaded.
+ * @return {boolean} The tile range is fully covered with loaded tiles.
+ */
+ol.source.Tile.prototype.forEachLoadedTile =
+    function(projection, z, tileRange, callback) {
+  var tileCache = this.getTileCacheForProjection(projection);
+  if (!tileCache) {
+    return false;
+  }
+
+  var covered = true;
+  var tile, tileCoordKey, loaded;
+  for (var x = tileRange.minX; x <= tileRange.maxX; ++x) {
+    for (var y = tileRange.minY; y <= tileRange.maxY; ++y) {
+      tileCoordKey = this.getKeyZXY(z, x, y);
+      loaded = false;
+      if (tileCache.containsKey(tileCoordKey)) {
+        tile = /** @type {!ol.Tile} */ (tileCache.get(tileCoordKey));
+        loaded = tile.getState() === ol.TileState.LOADED;
+        if (loaded) {
+          loaded = (callback(tile) !== false);
+        }
+      }
+      if (!loaded) {
+        covered = false;
+      }
+    }
+  }
+  return covered;
+};
+
+
+/**
+ * @return {number} Gutter.
+ */
+ol.source.Tile.prototype.getGutter = function() {
+  return 0;
+};
+
+
+/**
+ * Return the "parameters" key, a string composed of the source's
+ * parameters/dimensions.
+ * @return {string} The parameters key.
+ * @protected
+ */
+ol.source.Tile.prototype.getKeyParams = function() {
+  return '';
+};
+
+
+/**
+ * @param {number} z Z.
+ * @param {number} x X.
+ * @param {number} y Y.
+ * @return {string} Key.
+ * @protected
+ */
+ol.source.Tile.prototype.getKeyZXY = ol.tilecoord.getKeyZXY;
+
+
+/**
+ * @return {boolean} Opaque.
+ */
+ol.source.Tile.prototype.getOpaque = function() {
+  return this.opaque_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.Tile.prototype.getResolutions = function() {
+  return this.tileGrid.getResolutions();
+};
+
+
+/**
+ * @param {number} z Tile coordinate z.
+ * @param {number} x Tile coordinate x.
+ * @param {number} y Tile coordinate y.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {!ol.Tile} Tile.
+ */
+ol.source.Tile.prototype.getTile = goog.abstractMethod;
+
+
+/**
+ * Return the tile grid of the tile source.
+ * @return {ol.tilegrid.TileGrid} Tile grid.
+ * @api stable
+ */
+ol.source.Tile.prototype.getTileGrid = function() {
+  return this.tileGrid;
+};
+
+
+/**
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {ol.tilegrid.TileGrid} Tile grid.
+ */
+ol.source.Tile.prototype.getTileGridForProjection = function(projection) {
+  if (!this.tileGrid) {
+    return ol.tilegrid.getForProjection(projection);
+  } else {
+    return this.tileGrid;
+  }
+};
+
+
+/**
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {ol.TileCache} Tile cache.
+ * @protected
+ */
+ol.source.Tile.prototype.getTileCacheForProjection = function(projection) {
+  var thisProj = this.getProjection();
+  if (thisProj && !ol.proj.equivalent(thisProj, projection)) {
+    return null;
+  } else {
+    return this.tileCache;
+  }
+};
+
+
+/**
+ * @return {number} Tile pixel ratio.
+ */
+ol.source.Tile.prototype.getTilePixelRatio = function() {
+  return this.tilePixelRatio_;
+};
+
+
+/**
+ * @param {number} z Z.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {ol.Size} Tile size.
+ */
+ol.source.Tile.prototype.getTilePixelSize =
+    function(z, pixelRatio, projection) {
+  var tileGrid = this.getTileGridForProjection(projection);
+  return ol.size.scale(ol.size.toSize(tileGrid.getTileSize(z), this.tmpSize),
+      this.tilePixelRatio_, this.tmpSize);
+};
+
+
+/**
+ * Returns a tile coordinate wrapped around the x-axis. When the tile coordinate
+ * is outside the resolution and extent range of the tile grid, `null` will be
+ * returned.
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {ol.proj.Projection=} opt_projection Projection.
+ * @return {ol.TileCoord} Tile coordinate to be passed to the tileUrlFunction or
+ *     null if no tile URL should be created for the passed `tileCoord`.
+ */
+ol.source.Tile.prototype.getTileCoordForTileUrlFunction =
+    function(tileCoord, opt_projection) {
+  var projection = opt_projection !== undefined ?
+      opt_projection : this.getProjection();
+  var tileGrid = this.getTileGridForProjection(projection);
+  goog.asserts.assert(tileGrid, 'tile grid needed');
+  if (this.getWrapX() && projection.isGlobal()) {
+    tileCoord = ol.tilecoord.wrapX(tileCoord, tileGrid, projection);
+  }
+  return ol.tilecoord.withinExtentAndZ(tileCoord, tileGrid) ? tileCoord : null;
+};
+
+
+/**
+ * Marks a tile coord as being used, without triggering a load.
+ * @param {number} z Tile coordinate z.
+ * @param {number} x Tile coordinate x.
+ * @param {number} y Tile coordinate y.
+ * @param {ol.proj.Projection} projection Projection.
+ */
+ol.source.Tile.prototype.useTile = ol.nullFunction;
+
+
+
+/**
+ * @classdesc
+ * Events emitted by {@link ol.source.Tile} instances are instances of this
+ * type.
+ *
+ * @constructor
+ * @extends {goog.events.Event}
+ * @implements {oli.source.TileEvent}
+ * @param {string} type Type.
+ * @param {ol.Tile} tile The tile.
+ */
+ol.source.TileEvent = function(type, tile) {
+
+  goog.base(this, type);
+
+  /**
+   * The tile related to the event.
+   * @type {ol.Tile}
+   * @api
+   */
+  this.tile = tile;
+
+};
+goog.inherits(ol.source.TileEvent, goog.events.Event);
+
+
+/**
+ * @enum {string}
+ */
+ol.source.TileEventType = {
+
+  /**
+   * Triggered when a tile starts loading.
+   * @event ol.source.TileEvent#tileloadstart
+   * @api stable
+   */
+  TILELOADSTART: 'tileloadstart',
+
+  /**
+   * Triggered when a tile finishes loading.
+   * @event ol.source.TileEvent#tileloadend
+   * @api stable
+   */
+  TILELOADEND: 'tileloadend',
+
+  /**
+   * Triggered if tile loading results in an error.
+   * @event ol.source.TileEvent#tileloaderror
+   * @api stable
+   */
+  TILELOADERROR: 'tileloaderror'
+
+};
+
+// FIXME handle date line wrap
+
+goog.provide('ol.control.Attribution');
+
+goog.require('goog.asserts');
+goog.require('goog.dom');
+goog.require('goog.dom.classlist');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('goog.object');
+goog.require('goog.style');
+goog.require('ol');
+goog.require('ol.Attribution');
+goog.require('ol.control.Control');
+goog.require('ol.css');
+goog.require('ol.source.Tile');
+
+
+
+/**
+ * @classdesc
+ * Control to show all the attributions associated with the layer sources
+ * in the map. This control is one of the default controls included in maps.
+ * By default it will show in the bottom right portion of the map, but this can
+ * be changed by using a css selector for `.ol-attribution`.
+ *
+ * @constructor
+ * @extends {ol.control.Control}
+ * @param {olx.control.AttributionOptions=} opt_options Attribution options.
+ * @api stable
+ */
+ol.control.Attribution = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  /**
+   * @private
+   * @type {Element}
+   */
+  this.ulElement_ = document.createElement('UL');
+
+  /**
+   * @private
+   * @type {Element}
+   */
+  this.logoLi_ = document.createElement('LI');
+
+  this.ulElement_.appendChild(this.logoLi_);
+  goog.style.setElementShown(this.logoLi_, false);
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.collapsed_ = options.collapsed !== undefined ? options.collapsed : true;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.collapsible_ = options.collapsible !== undefined ?
+      options.collapsible : true;
+
+  if (!this.collapsible_) {
+    this.collapsed_ = false;
+  }
+
+  var className = options.className ? options.className : 'ol-attribution';
+
+  var tipLabel = options.tipLabel ? options.tipLabel : 'Attributions';
+
+  var collapseLabel = options.collapseLabel ? options.collapseLabel : '\u00BB';
+
+  /**
+   * @private
+   * @type {Node}
+   */
+  this.collapseLabel_ = goog.isString(collapseLabel) ?
+      goog.dom.createDom('SPAN', {}, collapseLabel) :
+      collapseLabel;
+
+  var label = options.label ? options.label : 'i';
+
+  /**
+   * @private
+   * @type {Node}
+   */
+  this.label_ = goog.isString(label) ?
+      goog.dom.createDom('SPAN', {}, label) :
+      label;
+
+  var activeLabel = (this.collapsible_ && !this.collapsed_) ?
+      this.collapseLabel_ : this.label_;
+  var button = goog.dom.createDom('BUTTON', {
+    'type': 'button',
+    'title': tipLabel
+  }, activeLabel);
+
+  goog.events.listen(button, goog.events.EventType.CLICK,
+      this.handleClick_, false, this);
+
+  var cssClasses = className + ' ' + ol.css.CLASS_UNSELECTABLE + ' ' +
+      ol.css.CLASS_CONTROL +
+      (this.collapsed_ && this.collapsible_ ? ' ol-collapsed' : '') +
+      (this.collapsible_ ? '' : ' ol-uncollapsible');
+  var element = goog.dom.createDom('DIV',
+      cssClasses, this.ulElement_, button);
+
+  var render = options.render ? options.render : ol.control.Attribution.render;
+
+  goog.base(this, {
+    element: element,
+    render: render,
+    target: options.target
+  });
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.renderedVisible_ = true;
+
+  /**
+   * @private
+   * @type {Object.<string, Element>}
+   */
+  this.attributionElements_ = {};
+
+  /**
+   * @private
+   * @type {Object.<string, boolean>}
+   */
+  this.attributionElementRenderedVisible_ = {};
+
+  /**
+   * @private
+   * @type {Object.<string, Element>}
+   */
+  this.logoElements_ = {};
+
+};
+goog.inherits(ol.control.Attribution, ol.control.Control);
+
+
+/**
+ * @param {?olx.FrameState} frameState Frame state.
+ * @return {Array.<Object.<string, ol.Attribution>>} Attributions.
+ */
+ol.control.Attribution.prototype.getSourceAttributions = function(frameState) {
+  var i, ii, j, jj, tileRanges, source, sourceAttribution,
+      sourceAttributionKey, sourceAttributions, sourceKey;
+  var intersectsTileRange;
+  var layerStatesArray = frameState.layerStatesArray;
+  /** @type {Object.<string, ol.Attribution>} */
+  var attributions = goog.object.clone(frameState.attributions);
+  /** @type {Object.<string, ol.Attribution>} */
+  var hiddenAttributions = {};
+  var projection = frameState.viewState.projection;
+  goog.asserts.assert(projection, 'projection of viewState required');
+  for (i = 0, ii = layerStatesArray.length; i < ii; i++) {
+    source = layerStatesArray[i].layer.getSource();
+    if (!source) {
+      continue;
+    }
+    sourceKey = goog.getUid(source).toString();
+    sourceAttributions = source.getAttributions();
+    if (!sourceAttributions) {
+      continue;
+    }
+    for (j = 0, jj = sourceAttributions.length; j < jj; j++) {
+      sourceAttribution = sourceAttributions[j];
+      sourceAttributionKey = goog.getUid(sourceAttribution).toString();
+      if (sourceAttributionKey in attributions) {
+        continue;
+      }
+      tileRanges = frameState.usedTiles[sourceKey];
+      if (tileRanges) {
+        goog.asserts.assertInstanceof(source, ol.source.Tile,
+            'source should be an ol.source.Tile');
+        var tileGrid = source.getTileGridForProjection(projection);
+        goog.asserts.assert(tileGrid, 'tileGrid required for projection');
+        intersectsTileRange = sourceAttribution.intersectsAnyTileRange(
+            tileRanges, tileGrid, projection);
+      } else {
+        intersectsTileRange = false;
+      }
+      if (intersectsTileRange) {
+        if (sourceAttributionKey in hiddenAttributions) {
+          delete hiddenAttributions[sourceAttributionKey];
+        }
+        attributions[sourceAttributionKey] = sourceAttribution;
+      } else {
+        hiddenAttributions[sourceAttributionKey] = sourceAttribution;
+      }
+    }
+  }
+  return [attributions, hiddenAttributions];
+};
+
+
+/**
+ * Update the attribution element.
+ * @param {ol.MapEvent} mapEvent Map event.
+ * @this {ol.control.Attribution}
+ * @api
+ */
+ol.control.Attribution.render = function(mapEvent) {
+  this.updateElement_(mapEvent.frameState);
+};
+
+
+/**
+ * @private
+ * @param {?olx.FrameState} frameState Frame state.
+ */
+ol.control.Attribution.prototype.updateElement_ = function(frameState) {
+
+  if (!frameState) {
+    if (this.renderedVisible_) {
+      goog.style.setElementShown(this.element, false);
+      this.renderedVisible_ = false;
+    }
+    return;
+  }
+
+  var attributions = this.getSourceAttributions(frameState);
+  /** @type {Object.<string, ol.Attribution>} */
+  var visibleAttributions = attributions[0];
+  /** @type {Object.<string, ol.Attribution>} */
+  var hiddenAttributions = attributions[1];
+
+  var attributionElement, attributionKey;
+  for (attributionKey in this.attributionElements_) {
+    if (attributionKey in visibleAttributions) {
+      if (!this.attributionElementRenderedVisible_[attributionKey]) {
+        goog.style.setElementShown(
+            this.attributionElements_[attributionKey], true);
+        this.attributionElementRenderedVisible_[attributionKey] = true;
+      }
+      delete visibleAttributions[attributionKey];
+    }
+    else if (attributionKey in hiddenAttributions) {
+      if (this.attributionElementRenderedVisible_[attributionKey]) {
+        goog.style.setElementShown(
+            this.attributionElements_[attributionKey], false);
+        delete this.attributionElementRenderedVisible_[attributionKey];
+      }
+      delete hiddenAttributions[attributionKey];
+    }
+    else {
+      goog.dom.removeNode(this.attributionElements_[attributionKey]);
+      delete this.attributionElements_[attributionKey];
+      delete this.attributionElementRenderedVisible_[attributionKey];
+    }
+  }
+  for (attributionKey in visibleAttributions) {
+    attributionElement = document.createElement('LI');
+    attributionElement.innerHTML =
+        visibleAttributions[attributionKey].getHTML();
+    this.ulElement_.appendChild(attributionElement);
+    this.attributionElements_[attributionKey] = attributionElement;
+    this.attributionElementRenderedVisible_[attributionKey] = true;
+  }
+  for (attributionKey in hiddenAttributions) {
+    attributionElement = document.createElement('LI');
+    attributionElement.innerHTML =
+        hiddenAttributions[attributionKey].getHTML();
+    goog.style.setElementShown(attributionElement, false);
+    this.ulElement_.appendChild(attributionElement);
+    this.attributionElements_[attributionKey] = attributionElement;
+  }
+
+  var renderVisible =
+      !goog.object.isEmpty(this.attributionElementRenderedVisible_) ||
+      !goog.object.isEmpty(frameState.logos);
+  if (this.renderedVisible_ != renderVisible) {
+    goog.style.setElementShown(this.element, renderVisible);
+    this.renderedVisible_ = renderVisible;
+  }
+  if (renderVisible &&
+      goog.object.isEmpty(this.attributionElementRenderedVisible_)) {
+    goog.dom.classlist.add(this.element, 'ol-logo-only');
+  } else {
+    goog.dom.classlist.remove(this.element, 'ol-logo-only');
+  }
+
+  this.insertLogos_(frameState);
+
+};
+
+
+/**
+ * @param {?olx.FrameState} frameState Frame state.
+ * @private
+ */
+ol.control.Attribution.prototype.insertLogos_ = function(frameState) {
+
+  var logo;
+  var logos = frameState.logos;
+  var logoElements = this.logoElements_;
+
+  for (logo in logoElements) {
+    if (!(logo in logos)) {
+      goog.dom.removeNode(logoElements[logo]);
+      delete logoElements[logo];
+    }
+  }
+
+  var image, logoElement, logoKey;
+  for (logoKey in logos) {
+    if (!(logoKey in logoElements)) {
+      image = new Image();
+      image.src = logoKey;
+      var logoValue = logos[logoKey];
+      if (logoValue === '') {
+        logoElement = image;
+      } else {
+        logoElement = goog.dom.createDom('A', {
+          'href': logoValue
+        });
+        logoElement.appendChild(image);
+      }
+      this.logoLi_.appendChild(logoElement);
+      logoElements[logoKey] = logoElement;
+    }
+  }
+
+  goog.style.setElementShown(this.logoLi_, !goog.object.isEmpty(logos));
+
+};
+
+
+/**
+ * @param {goog.events.BrowserEvent} event The event to handle
+ * @private
+ */
+ol.control.Attribution.prototype.handleClick_ = function(event) {
+  event.preventDefault();
+  this.handleToggle_();
+};
+
+
+/**
+ * @private
+ */
+ol.control.Attribution.prototype.handleToggle_ = function() {
+  goog.dom.classlist.toggle(this.element, 'ol-collapsed');
+  if (this.collapsed_) {
+    goog.dom.replaceNode(this.collapseLabel_, this.label_);
+  } else {
+    goog.dom.replaceNode(this.label_, this.collapseLabel_);
+  }
+  this.collapsed_ = !this.collapsed_;
+};
+
+
+/**
+ * Return `true` if the attribution is collapsible, `false` otherwise.
+ * @return {boolean} True if the widget is collapsible.
+ * @api stable
+ */
+ol.control.Attribution.prototype.getCollapsible = function() {
+  return this.collapsible_;
+};
+
+
+/**
+ * Set whether the attribution should be collapsible.
+ * @param {boolean} collapsible True if the widget is collapsible.
+ * @api stable
+ */
+ol.control.Attribution.prototype.setCollapsible = function(collapsible) {
+  if (this.collapsible_ === collapsible) {
+    return;
+  }
+  this.collapsible_ = collapsible;
+  goog.dom.classlist.toggle(this.element, 'ol-uncollapsible');
+  if (!collapsible && this.collapsed_) {
+    this.handleToggle_();
+  }
+};
+
+
+/**
+ * Collapse or expand the attribution according to the passed parameter. Will
+ * not do anything if the attribution isn't collapsible or if the current
+ * collapsed state is already the one requested.
+ * @param {boolean} collapsed True if the widget is collapsed.
+ * @api stable
+ */
+ol.control.Attribution.prototype.setCollapsed = function(collapsed) {
+  if (!this.collapsible_ || this.collapsed_ === collapsed) {
+    return;
+  }
+  this.handleToggle_();
+};
+
+
+/**
+ * Return `true` when the attribution is currently collapsed or `false`
+ * otherwise.
+ * @return {boolean} True if the widget is collapsed.
+ * @api stable
+ */
+ol.control.Attribution.prototype.getCollapsed = function() {
+  return this.collapsed_;
+};
+
+goog.provide('ol.control.Rotate');
+
+goog.require('goog.dom');
+goog.require('goog.dom.classlist');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('ol');
+goog.require('ol.animation');
+goog.require('ol.control.Control');
+goog.require('ol.css');
+goog.require('ol.easing');
+
+
+
+/**
+ * @classdesc
+ * A button control to reset rotation to 0.
+ * To style this control use css selector `.ol-rotate`. A `.ol-hidden` css
+ * selector is added to the button when the rotation is 0.
+ *
+ * @constructor
+ * @extends {ol.control.Control}
+ * @param {olx.control.RotateOptions=} opt_options Rotate options.
+ * @api stable
+ */
+ol.control.Rotate = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  var className = options.className ?
+      options.className : 'ol-rotate';
+
+  var label = options.label ? options.label : '\u21E7';
+
+  /**
+   * @type {Element}
+   * @private
+   */
+  this.label_ = null;
+
+  if (goog.isString(label)) {
+    this.label_ = goog.dom.createDom('SPAN',
+        'ol-compass', label);
+  } else {
+    this.label_ = label;
+    goog.dom.classlist.add(this.label_, 'ol-compass');
+  }
+
+  var tipLabel = options.tipLabel ? options.tipLabel : 'Reset rotation';
+
+  var button = goog.dom.createDom('BUTTON', {
+    'class': className + '-reset',
+    'type' : 'button',
+    'title': tipLabel
+  }, this.label_);
+
+  goog.events.listen(button, goog.events.EventType.CLICK,
+      ol.control.Rotate.prototype.handleClick_, false, this);
+
+  var cssClasses = className + ' ' + ol.css.CLASS_UNSELECTABLE + ' ' +
+      ol.css.CLASS_CONTROL;
+  var element = goog.dom.createDom('DIV', cssClasses, button);
+
+  var render = options.render ? options.render : ol.control.Rotate.render;
+
+  this.callResetNorth_ = options.resetNorth ? options.resetNorth : undefined;
+
+  goog.base(this, {
+    element: element,
+    render: render,
+    target: options.target
+  });
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.duration_ = options.duration !== undefined ? options.duration : 250;
+
+  /**
+   * @type {boolean}
+   * @private
+   */
+  this.autoHide_ = options.autoHide !== undefined ? options.autoHide : true;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.rotation_ = undefined;
+
+  if (this.autoHide_) {
+    goog.dom.classlist.add(this.element, ol.css.CLASS_HIDDEN);
+  }
+
+};
+goog.inherits(ol.control.Rotate, ol.control.Control);
+
+
+/**
+ * @param {goog.events.BrowserEvent} event The event to handle
+ * @private
+ */
+ol.control.Rotate.prototype.handleClick_ = function(event) {
+  event.preventDefault();
+  if (this.callResetNorth_ !== undefined) {
+    this.callResetNorth_();
+  } else {
+    this.resetNorth_();
+  }
+};
+
+
+/**
+ * @private
+ */
+ol.control.Rotate.prototype.resetNorth_ = function() {
+  var map = this.getMap();
+  var view = map.getView();
+  if (!view) {
+    // the map does not have a view, so we can't act
+    // upon it
+    return;
+  }
+  var currentRotation = view.getRotation();
+  if (currentRotation !== undefined) {
+    if (this.duration_ > 0) {
+      currentRotation = currentRotation % (2 * Math.PI);
+      if (currentRotation < -Math.PI) {
+        currentRotation += 2 * Math.PI;
+      }
+      if (currentRotation > Math.PI) {
+        currentRotation -= 2 * Math.PI;
+      }
+      map.beforeRender(ol.animation.rotate({
+        rotation: currentRotation,
+        duration: this.duration_,
+        easing: ol.easing.easeOut
+      }));
+    }
+    view.setRotation(0);
+  }
+};
+
+
+/**
+ * Update the rotate control element.
+ * @param {ol.MapEvent} mapEvent Map event.
+ * @this {ol.control.Rotate}
+ * @api
+ */
+ol.control.Rotate.render = function(mapEvent) {
+  var frameState = mapEvent.frameState;
+  if (!frameState) {
+    return;
+  }
+  var rotation = frameState.viewState.rotation;
+  if (rotation != this.rotation_) {
+    var transform = 'rotate(' + rotation + 'rad)';
+    if (this.autoHide_) {
+      goog.dom.classlist.enable(
+          this.element, ol.css.CLASS_HIDDEN, rotation === 0);
+    }
+    this.label_.style.msTransform = transform;
+    this.label_.style.webkitTransform = transform;
+    this.label_.style.transform = transform;
+  }
+  this.rotation_ = rotation;
+};
+
+goog.provide('ol.control.Zoom');
+
+goog.require('goog.dom');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('ol.animation');
+goog.require('ol.control.Control');
+goog.require('ol.css');
+goog.require('ol.easing');
+
+
+
+/**
+ * @classdesc
+ * A control with 2 buttons, one for zoom in and one for zoom out.
+ * This control is one of the default controls of a map. To style this control
+ * use css selectors `.ol-zoom-in` and `.ol-zoom-out`.
+ *
+ * @constructor
+ * @extends {ol.control.Control}
+ * @param {olx.control.ZoomOptions=} opt_options Zoom options.
+ * @api stable
+ */
+ol.control.Zoom = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  var className = options.className ? options.className : 'ol-zoom';
+
+  var delta = options.delta ? options.delta : 1;
+
+  var zoomInLabel = options.zoomInLabel ? options.zoomInLabel : '+';
+  var zoomOutLabel = options.zoomOutLabel ? options.zoomOutLabel : '\u2212';
+
+  var zoomInTipLabel = options.zoomInTipLabel ?
+      options.zoomInTipLabel : 'Zoom in';
+  var zoomOutTipLabel = options.zoomOutTipLabel ?
+      options.zoomOutTipLabel : 'Zoom out';
+
+  var inElement = goog.dom.createDom('BUTTON', {
+    'class': className + '-in',
+    'type' : 'button',
+    'title': zoomInTipLabel
+  }, zoomInLabel);
+
+  goog.events.listen(inElement,
+      goog.events.EventType.CLICK, goog.partial(
+          ol.control.Zoom.prototype.handleClick_, delta), false, this);
+
+  var outElement = goog.dom.createDom('BUTTON', {
+    'class': className + '-out',
+    'type' : 'button',
+    'title': zoomOutTipLabel
+  }, zoomOutLabel);
+
+  goog.events.listen(outElement,
+      goog.events.EventType.CLICK, goog.partial(
+          ol.control.Zoom.prototype.handleClick_, -delta), false, this);
+
+  var cssClasses = className + ' ' + ol.css.CLASS_UNSELECTABLE + ' ' +
+      ol.css.CLASS_CONTROL;
+  var element = goog.dom.createDom('DIV', cssClasses, inElement,
+      outElement);
+
+  goog.base(this, {
+    element: element,
+    target: options.target
+  });
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.duration_ = options.duration !== undefined ? options.duration : 250;
+
+};
+goog.inherits(ol.control.Zoom, ol.control.Control);
+
+
+/**
+ * @param {number} delta Zoom delta.
+ * @param {goog.events.BrowserEvent} event The event to handle
+ * @private
+ */
+ol.control.Zoom.prototype.handleClick_ = function(delta, event) {
+  event.preventDefault();
+  this.zoomByDelta_(delta);
+};
+
+
+/**
+ * @param {number} delta Zoom delta.
+ * @private
+ */
+ol.control.Zoom.prototype.zoomByDelta_ = function(delta) {
+  var map = this.getMap();
+  var view = map.getView();
+  if (!view) {
+    // the map does not have a view, so we can't act
+    // upon it
+    return;
+  }
+  var currentResolution = view.getResolution();
+  if (currentResolution) {
+    if (this.duration_ > 0) {
+      map.beforeRender(ol.animation.zoom({
+        resolution: currentResolution,
+        duration: this.duration_,
+        easing: ol.easing.easeOut
+      }));
+    }
+    var newResolution = view.constrainResolution(currentResolution, delta);
+    view.setResolution(newResolution);
+  }
+};
+
+goog.provide('ol.control');
+
+goog.require('ol');
+goog.require('ol.Collection');
+goog.require('ol.control.Attribution');
+goog.require('ol.control.Rotate');
+goog.require('ol.control.Zoom');
+
+
+/**
+ * Set of controls included in maps by default. Unless configured otherwise,
+ * this returns a collection containing an instance of each of the following
+ * controls:
+ * * {@link ol.control.Zoom}
+ * * {@link ol.control.Rotate}
+ * * {@link ol.control.Attribution}
+ *
+ * @param {olx.control.DefaultsOptions=} opt_options Defaults options.
+ * @return {ol.Collection.<ol.control.Control>} Controls.
+ * @api stable
+ */
+ol.control.defaults = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  var controls = new ol.Collection();
+
+  var zoomControl = options.zoom !== undefined ? options.zoom : true;
+  if (zoomControl) {
+    controls.push(new ol.control.Zoom(options.zoomOptions));
+  }
+
+  var rotateControl = options.rotate !== undefined ? options.rotate : true;
+  if (rotateControl) {
+    controls.push(new ol.control.Rotate(options.rotateOptions));
+  }
+
+  var attributionControl = options.attribution !== undefined ?
+      options.attribution : true;
+  if (attributionControl) {
+    controls.push(new ol.control.Attribution(options.attributionOptions));
+  }
+
+  return controls;
+
+};
+
+// Copyright 2012 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Functions for managing full screen status of the DOM.
+ *
+ */
+
+goog.provide('goog.dom.fullscreen');
+goog.provide('goog.dom.fullscreen.EventType');
+
+goog.require('goog.dom');
+goog.require('goog.userAgent');
+
+
+/**
+ * Event types for full screen.
+ * @enum {string}
+ */
+goog.dom.fullscreen.EventType = {
+  /** Dispatched by the Document when the fullscreen status changes. */
+  CHANGE: (function() {
+    if (goog.userAgent.WEBKIT) {
+      return 'webkitfullscreenchange';
+    }
+    if (goog.userAgent.GECKO) {
+      return 'mozfullscreenchange';
+    }
+    if (goog.userAgent.IE) {
+      return 'MSFullscreenChange';
+    }
+    // Opera 12-14, and W3C standard (Draft):
+    // https://dvcs.w3.org/hg/fullscreen/raw-file/tip/Overview.html
+    return 'fullscreenchange';
+  })()
+};
+
+
+/**
+ * Determines if full screen is supported.
+ * @param {!goog.dom.DomHelper=} opt_domHelper The DomHelper for the DOM being
+ *     queried. If not provided, use the current DOM.
+ * @return {boolean} True iff full screen is supported.
+ */
+goog.dom.fullscreen.isSupported = function(opt_domHelper) {
+  var doc = goog.dom.fullscreen.getDocument_(opt_domHelper);
+  var body = doc.body;
+  return !!(body.webkitRequestFullscreen ||
+      (body.mozRequestFullScreen && doc.mozFullScreenEnabled) ||
+      (body.msRequestFullscreen && doc.msFullscreenEnabled) ||
+      (body.requestFullscreen && doc.fullscreenEnabled));
+};
+
+
+/**
+ * Requests putting the element in full screen.
+ * @param {!Element} element The element to put full screen.
+ */
+goog.dom.fullscreen.requestFullScreen = function(element) {
+  if (element.webkitRequestFullscreen) {
+    element.webkitRequestFullscreen();
+  } else if (element.mozRequestFullScreen) {
+    element.mozRequestFullScreen();
+  } else if (element.msRequestFullscreen) {
+    element.msRequestFullscreen();
+  } else if (element.requestFullscreen) {
+    element.requestFullscreen();
+  }
+};
+
+
+/**
+ * Requests putting the element in full screen with full keyboard access.
+ * @param {!Element} element The element to put full screen.
+ */
+goog.dom.fullscreen.requestFullScreenWithKeys = function(
+    element) {
+  if (element.mozRequestFullScreenWithKeys) {
+    element.mozRequestFullScreenWithKeys();
+  } else if (element.webkitRequestFullscreen) {
+    element.webkitRequestFullscreen();
+  } else {
+    goog.dom.fullscreen.requestFullScreen(element);
+  }
+};
+
+
+/**
+ * Exits full screen.
+ * @param {!goog.dom.DomHelper=} opt_domHelper The DomHelper for the DOM being
+ *     queried. If not provided, use the current DOM.
+ */
+goog.dom.fullscreen.exitFullScreen = function(opt_domHelper) {
+  var doc = goog.dom.fullscreen.getDocument_(opt_domHelper);
+  if (doc.webkitCancelFullScreen) {
+    doc.webkitCancelFullScreen();
+  } else if (doc.mozCancelFullScreen) {
+    doc.mozCancelFullScreen();
+  } else if (doc.msExitFullscreen) {
+    doc.msExitFullscreen();
+  } else if (doc.exitFullscreen) {
+    doc.exitFullscreen();
+  }
+};
+
+
+/**
+ * Determines if the document is full screen.
+ * @param {!goog.dom.DomHelper=} opt_domHelper The DomHelper for the DOM being
+ *     queried. If not provided, use the current DOM.
+ * @return {boolean} Whether the document is full screen.
+ */
+goog.dom.fullscreen.isFullScreen = function(opt_domHelper) {
+  var doc = goog.dom.fullscreen.getDocument_(opt_domHelper);
+  // IE 11 doesn't have similar boolean property, so check whether
+  // document.msFullscreenElement is null instead.
+  return !!(doc.webkitIsFullScreen || doc.mozFullScreen ||
+      doc.msFullscreenElement || doc.fullscreenElement);
+};
+
+
+/**
+ * Get the root element in full screen mode.
+ * @param {!goog.dom.DomHelper=} opt_domHelper The DomHelper for the DOM being
+ *     queried. If not provided, use the current DOM.
+ * @return {?Element} The root element in full screen mode.
+ */
+goog.dom.fullscreen.getFullScreenElement = function(opt_domHelper) {
+  var doc = goog.dom.fullscreen.getDocument_(opt_domHelper);
+  var element_list = [
+    doc.webkitFullscreenElement,
+    doc.mozFullScreenElement,
+    doc.msFullscreenElement,
+    doc.fullscreenElement
+  ];
+  for (var i = 0; i < element_list.length; i++) {
+    if (element_list[i] != null) {
+      return element_list[i];
+    }
+  }
+  return null;
+};
+
+
+/**
+ * Gets the document object of the dom.
+ * @param {!goog.dom.DomHelper=} opt_domHelper The DomHelper for the DOM being
+ *     queried. If not provided, use the current DOM.
+ * @return {!Document} The dom document.
+ * @private
+ */
+goog.dom.fullscreen.getDocument_ = function(opt_domHelper) {
+  return opt_domHelper ?
+      opt_domHelper.getDocument() :
+      goog.dom.getDomHelper().getDocument();
+};
+
+goog.provide('ol.control.FullScreen');
+
+goog.require('goog.asserts');
+goog.require('goog.dom');
+goog.require('goog.dom.classlist');
+goog.require('goog.dom.fullscreen');
+goog.require('goog.dom.fullscreen.EventType');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('ol');
+goog.require('ol.control.Control');
+goog.require('ol.css');
+
+
+
+/**
+ * @classdesc
+ * Provides a button that when clicked fills up the full screen with the map.
+ * When in full screen mode, a close button is shown to exit full screen mode.
+ * The [Fullscreen API](http://www.w3.org/TR/fullscreen/) is used to
+ * toggle the map in full screen mode.
+ *
+ *
+ * @constructor
+ * @extends {ol.control.Control}
+ * @param {olx.control.FullScreenOptions=} opt_options Options.
+ * @api stable
+ */
+ol.control.FullScreen = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.cssClassName_ = options.className ? options.className : 'ol-full-screen';
+
+  var label = options.label ? options.label : '\u2922';
+
+  /**
+   * @private
+   * @type {Node}
+   */
+  this.labelNode_ = goog.isString(label) ?
+      document.createTextNode(label) : label;
+
+  var labelActive = options.labelActive ? options.labelActive : '\u00d7';
+
+  /**
+   * @private
+   * @type {Node}
+   */
+  this.labelActiveNode_ = goog.isString(labelActive) ?
+      document.createTextNode(labelActive) : labelActive;
+
+  var tipLabel = options.tipLabel ? options.tipLabel : 'Toggle full-screen';
+  var button = goog.dom.createDom('BUTTON', {
+    'class': this.cssClassName_ + '-' + goog.dom.fullscreen.isFullScreen(),
+    'type': 'button',
+    'title': tipLabel
+  }, this.labelNode_);
+
+  goog.events.listen(button, goog.events.EventType.CLICK,
+      this.handleClick_, false, this);
+
+  goog.events.listen(goog.global.document,
+      goog.dom.fullscreen.EventType.CHANGE,
+      this.handleFullScreenChange_, false, this);
+
+  var cssClasses = this.cssClassName_ + ' ' + ol.css.CLASS_UNSELECTABLE +
+      ' ' + ol.css.CLASS_CONTROL + ' ' +
+      (!goog.dom.fullscreen.isSupported() ? ol.css.CLASS_UNSUPPORTED : '');
+  var element = goog.dom.createDom('DIV', cssClasses, button);
+
+  goog.base(this, {
+    element: element,
+    target: options.target
+  });
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.keys_ = options.keys !== undefined ? options.keys : false;
+
+};
+goog.inherits(ol.control.FullScreen, ol.control.Control);
+
+
+/**
+ * @param {goog.events.BrowserEvent} event The event to handle
+ * @private
+ */
+ol.control.FullScreen.prototype.handleClick_ = function(event) {
+  event.preventDefault();
+  this.handleFullScreen_();
+};
+
+
+/**
+ * @private
+ */
+ol.control.FullScreen.prototype.handleFullScreen_ = function() {
+  if (!goog.dom.fullscreen.isSupported()) {
+    return;
+  }
+  var map = this.getMap();
+  if (!map) {
+    return;
+  }
+  if (goog.dom.fullscreen.isFullScreen()) {
+    goog.dom.fullscreen.exitFullScreen();
+  } else {
+    var target = map.getTarget();
+    goog.asserts.assert(target, 'target should be defined');
+    var element = goog.dom.getElement(target);
+    goog.asserts.assert(element, 'element should be defined');
+    if (this.keys_) {
+      goog.dom.fullscreen.requestFullScreenWithKeys(element);
+    } else {
+      goog.dom.fullscreen.requestFullScreen(element);
+    }
+  }
+};
+
+
+/**
+ * @private
+ */
+ol.control.FullScreen.prototype.handleFullScreenChange_ = function() {
+  var opened = this.cssClassName_ + '-true';
+  var closed = this.cssClassName_ + '-false';
+  var button = goog.dom.getFirstElementChild(this.element);
+  var map = this.getMap();
+  if (goog.dom.fullscreen.isFullScreen()) {
+    goog.dom.classlist.swap(button, closed, opened);
+    goog.dom.replaceNode(this.labelActiveNode_, this.labelNode_);
+  } else {
+    goog.dom.classlist.swap(button, opened, closed);
+    goog.dom.replaceNode(this.labelNode_, this.labelActiveNode_);
+  }
+  if (map) {
+    map.updateSize();
+  }
+};
+
+goog.provide('ol.Pixel');
+
+
+/**
+ * An array with two elements, representing a pixel. The first element is the
+ * x-coordinate, the second the y-coordinate of the pixel.
+ * @typedef {Array.<number>}
+ * @api stable
+ */
+ol.Pixel;
+
+// FIXME should listen on appropriate pane, once it is defined
+
+goog.provide('ol.control.MousePosition');
+
+goog.require('goog.dom');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('ol.CoordinateFormatType');
+goog.require('ol.Object');
+goog.require('ol.Pixel');
+goog.require('ol.TransformFunction');
+goog.require('ol.control.Control');
+goog.require('ol.proj');
+goog.require('ol.proj.Projection');
+
+
+/**
+ * @enum {string}
+ */
+ol.control.MousePositionProperty = {
+  PROJECTION: 'projection',
+  COORDINATE_FORMAT: 'coordinateFormat'
+};
+
+
+
+/**
+ * @classdesc
+ * A control to show the 2D coordinates of the mouse cursor. By default, these
+ * are in the view projection, but can be in any supported projection.
+ * By default the control is shown in the top right corner of the map, but this
+ * can be changed by using the css selector `.ol-mouse-position`.
+ *
+ * @constructor
+ * @extends {ol.control.Control}
+ * @param {olx.control.MousePositionOptions=} opt_options Mouse position
+ *     options.
+ * @api stable
+ */
+ol.control.MousePosition = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  var className = options.className ? options.className : 'ol-mouse-position';
+
+  var element = goog.dom.createDom('DIV', className);
+
+  var render = options.render ?
+      options.render : ol.control.MousePosition.render;
+
+  goog.base(this, {
+    element: element,
+    render: render,
+    target: options.target
+  });
+
+  goog.events.listen(this,
+      ol.Object.getChangeEventType(ol.control.MousePositionProperty.PROJECTION),
+      this.handleProjectionChanged_, false, this);
+
+  if (options.coordinateFormat) {
+    this.setCoordinateFormat(options.coordinateFormat);
+  }
+  if (options.projection) {
+    this.setProjection(ol.proj.get(options.projection));
+  }
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.undefinedHTML_ = options.undefinedHTML ? options.undefinedHTML : '';
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.renderedHTML_ = element.innerHTML;
+
+  /**
+   * @private
+   * @type {ol.proj.Projection}
+   */
+  this.mapProjection_ = null;
+
+  /**
+   * @private
+   * @type {?ol.TransformFunction}
+   */
+  this.transform_ = null;
+
+  /**
+   * @private
+   * @type {ol.Pixel}
+   */
+  this.lastMouseMovePixel_ = null;
+
+};
+goog.inherits(ol.control.MousePosition, ol.control.Control);
+
+
+/**
+ * Update the mouseposition element.
+ * @param {ol.MapEvent} mapEvent Map event.
+ * @this {ol.control.MousePosition}
+ * @api
+ */
+ol.control.MousePosition.render = function(mapEvent) {
+  var frameState = mapEvent.frameState;
+  if (!frameState) {
+    this.mapProjection_ = null;
+  } else {
+    if (this.mapProjection_ != frameState.viewState.projection) {
+      this.mapProjection_ = frameState.viewState.projection;
+      this.transform_ = null;
+    }
+  }
+  this.updateHTML_(this.lastMouseMovePixel_);
+};
+
+
+/**
+ * @private
+ */
+ol.control.MousePosition.prototype.handleProjectionChanged_ = function() {
+  this.transform_ = null;
+};
+
+
+/**
+ * Return the coordinate format type used to render the current position or
+ * undefined.
+ * @return {ol.CoordinateFormatType|undefined} The format to render the current
+ *     position in.
+ * @observable
+ * @api stable
+ */
+ol.control.MousePosition.prototype.getCoordinateFormat = function() {
+  return /** @type {ol.CoordinateFormatType|undefined} */ (
+      this.get(ol.control.MousePositionProperty.COORDINATE_FORMAT));
+};
+
+
+/**
+ * Return the projection that is used to report the mouse position.
+ * @return {ol.proj.Projection|undefined} The projection to report mouse
+ *     position in.
+ * @observable
+ * @api stable
+ */
+ol.control.MousePosition.prototype.getProjection = function() {
+  return /** @type {ol.proj.Projection|undefined} */ (
+      this.get(ol.control.MousePositionProperty.PROJECTION));
+};
+
+
+/**
+ * @param {goog.events.BrowserEvent} browserEvent Browser event.
+ * @protected
+ */
+ol.control.MousePosition.prototype.handleMouseMove = function(browserEvent) {
+  var map = this.getMap();
+  this.lastMouseMovePixel_ = map.getEventPixel(browserEvent.getBrowserEvent());
+  this.updateHTML_(this.lastMouseMovePixel_);
+};
+
+
+/**
+ * @param {goog.events.BrowserEvent} browserEvent Browser event.
+ * @protected
+ */
+ol.control.MousePosition.prototype.handleMouseOut = function(browserEvent) {
+  this.updateHTML_(null);
+  this.lastMouseMovePixel_ = null;
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.control.MousePosition.prototype.setMap = function(map) {
+  goog.base(this, 'setMap', map);
+  if (map) {
+    var viewport = map.getViewport();
+    this.listenerKeys.push(
+        goog.events.listen(viewport, goog.events.EventType.MOUSEMOVE,
+            this.handleMouseMove, false, this),
+        goog.events.listen(viewport, goog.events.EventType.MOUSEOUT,
+            this.handleMouseOut, false, this)
+    );
+  }
+};
+
+
+/**
+ * Set the coordinate format type used to render the current position.
+ * @param {ol.CoordinateFormatType} format The format to render the current
+ *     position in.
+ * @observable
+ * @api stable
+ */
+ol.control.MousePosition.prototype.setCoordinateFormat = function(format) {
+  this.set(ol.control.MousePositionProperty.COORDINATE_FORMAT, format);
+};
+
+
+/**
+ * Set the projection that is used to report the mouse position.
+ * @param {ol.proj.Projection} projection The projection to report mouse
+ *     position in.
+ * @observable
+ * @api stable
+ */
+ol.control.MousePosition.prototype.setProjection = function(projection) {
+  this.set(ol.control.MousePositionProperty.PROJECTION, projection);
+};
+
+
+/**
+ * @param {?ol.Pixel} pixel Pixel.
+ * @private
+ */
+ol.control.MousePosition.prototype.updateHTML_ = function(pixel) {
+  var html = this.undefinedHTML_;
+  if (pixel && this.mapProjection_) {
+    if (!this.transform_) {
+      var projection = this.getProjection();
+      if (projection) {
+        this.transform_ = ol.proj.getTransformFromProjections(
+            this.mapProjection_, projection);
+      } else {
+        this.transform_ = ol.proj.identityTransform;
+      }
+    }
+    var map = this.getMap();
+    var coordinate = map.getCoordinateFromPixel(pixel);
+    if (coordinate) {
+      this.transform_(coordinate, coordinate);
+      var coordinateFormat = this.getCoordinateFormat();
+      if (coordinateFormat) {
+        html = coordinateFormat(coordinate);
+      } else {
+        html = coordinate.toString();
+      }
+    }
+  }
+  if (!this.renderedHTML_ || html != this.renderedHTML_) {
+    this.element.innerHTML = html;
+    this.renderedHTML_ = html;
+  }
+};
+
+// Copyright 2012 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview A delayed callback that pegs to the next animation frame
+ * instead of a user-configurable timeout.
+ *
+ * @author nicksantos@google.com (Nick Santos)
+ */
+
+goog.provide('goog.async.AnimationDelay');
+
+goog.require('goog.Disposable');
+goog.require('goog.events');
+goog.require('goog.functions');
+
+
+
+// TODO(nicksantos): Should we factor out the common code between this and
+// goog.async.Delay? I'm not sure if there's enough code for this to really
+// make sense. Subclassing seems like the wrong approach for a variety of
+// reasons. Maybe there should be a common interface?
+
+
+
+/**
+ * A delayed callback that pegs to the next animation frame
+ * instead of a user configurable timeout. By design, this should have
+ * the same interface as goog.async.Delay.
+ *
+ * Uses requestAnimationFrame and friends when available, but falls
+ * back to a timeout of goog.async.AnimationDelay.TIMEOUT.
+ *
+ * For more on requestAnimationFrame and how you can use it to create smoother
+ * animations, see:
+ * @see http://paulirish.com/2011/requestanimationframe-for-smart-animating/
+ *
+ * @param {function(number)} listener Function to call when the delay completes.
+ *     Will be passed the timestamp when it's called, in unix ms.
+ * @param {Window=} opt_window The window object to execute the delay in.
+ *     Defaults to the global object.
+ * @param {Object=} opt_handler The object scope to invoke the function in.
+ * @constructor
+ * @struct
+ * @extends {goog.Disposable}
+ * @final
+ */
+goog.async.AnimationDelay = function(listener, opt_window, opt_handler) {
+  goog.async.AnimationDelay.base(this, 'constructor');
+
+  /**
+   * Identifier of the active delay timeout, or event listener,
+   * or null when inactive.
+   * @private {goog.events.Key|number}
+   */
+  this.id_ = null;
+
+  /**
+   * If we're using dom listeners.
+   * @private {?boolean}
+   */
+  this.usingListeners_ = false;
+
+  /**
+   * The function that will be invoked after a delay.
+   * @private {function(number)}
+   */
+  this.listener_ = listener;
+
+  /**
+   * The object context to invoke the callback in.
+   * @private {Object|undefined}
+   */
+  this.handler_ = opt_handler;
+
+  /**
+   * @private {Window}
+   */
+  this.win_ = opt_window || window;
+
+  /**
+   * Cached callback function invoked when the delay finishes.
+   * @private {function()}
+   */
+  this.callback_ = goog.bind(this.doAction_, this);
+};
+goog.inherits(goog.async.AnimationDelay, goog.Disposable);
+
+
+/**
+ * Default wait timeout for animations (in milliseconds).  Only used for timed
+ * animation, which uses a timer (setTimeout) to schedule animation.
+ *
+ * @type {number}
+ * @const
+ */
+goog.async.AnimationDelay.TIMEOUT = 20;
+
+
+/**
+ * Name of event received from the requestAnimationFrame in Firefox.
+ *
+ * @type {string}
+ * @const
+ * @private
+ */
+goog.async.AnimationDelay.MOZ_BEFORE_PAINT_EVENT_ = 'MozBeforePaint';
+
+
+/**
+ * Starts the delay timer. The provided listener function will be called
+ * before the next animation frame.
+ */
+goog.async.AnimationDelay.prototype.start = function() {
+  this.stop();
+  this.usingListeners_ = false;
+
+  var raf = this.getRaf_();
+  var cancelRaf = this.getCancelRaf_();
+  if (raf && !cancelRaf && this.win_.mozRequestAnimationFrame) {
+    // Because Firefox (Gecko) runs animation in separate threads, it also saves
+    // time by running the requestAnimationFrame callbacks in that same thread.
+    // Sadly this breaks the assumption of implicit thread-safety in JS, and can
+    // thus create thread-based inconsistencies on counters etc.
+    //
+    // Calling cycleAnimations_ using the MozBeforePaint event instead of as
+    // callback fixes this.
+    //
+    // Trigger this condition only if the mozRequestAnimationFrame is available,
+    // but not the W3C requestAnimationFrame function (as in draft) or the
+    // equivalent cancel functions.
+    this.id_ = goog.events.listen(
+        this.win_,
+        goog.async.AnimationDelay.MOZ_BEFORE_PAINT_EVENT_,
+        this.callback_);
+    this.win_.mozRequestAnimationFrame(null);
+    this.usingListeners_ = true;
+  } else if (raf && cancelRaf) {
+    this.id_ = raf.call(this.win_, this.callback_);
+  } else {
+    this.id_ = this.win_.setTimeout(
+        // Prior to Firefox 13, Gecko passed a non-standard parameter
+        // to the callback that we want to ignore.
+        goog.functions.lock(this.callback_),
+        goog.async.AnimationDelay.TIMEOUT);
+  }
+};
+
+
+/**
+ * Stops the delay timer if it is active. No action is taken if the timer is not
+ * in use.
+ */
+goog.async.AnimationDelay.prototype.stop = function() {
+  if (this.isActive()) {
+    var raf = this.getRaf_();
+    var cancelRaf = this.getCancelRaf_();
+    if (raf && !cancelRaf && this.win_.mozRequestAnimationFrame) {
+      goog.events.unlistenByKey(this.id_);
+    } else if (raf && cancelRaf) {
+      cancelRaf.call(this.win_, /** @type {number} */ (this.id_));
+    } else {
+      this.win_.clearTimeout(/** @type {number} */ (this.id_));
+    }
+  }
+  this.id_ = null;
+};
+
+
+/**
+ * Fires delay's action even if timer has already gone off or has not been
+ * started yet; guarantees action firing. Stops the delay timer.
+ */
+goog.async.AnimationDelay.prototype.fire = function() {
+  this.stop();
+  this.doAction_();
+};
+
+
+/**
+ * Fires delay's action only if timer is currently active. Stops the delay
+ * timer.
+ */
+goog.async.AnimationDelay.prototype.fireIfActive = function() {
+  if (this.isActive()) {
+    this.fire();
+  }
+};
+
+
+/**
+ * @return {boolean} True if the delay is currently active, false otherwise.
+ */
+goog.async.AnimationDelay.prototype.isActive = function() {
+  return this.id_ != null;
+};
+
+
+/**
+ * Invokes the callback function after the delay successfully completes.
+ * @private
+ */
+goog.async.AnimationDelay.prototype.doAction_ = function() {
+  if (this.usingListeners_ && this.id_) {
+    goog.events.unlistenByKey(this.id_);
+  }
+  this.id_ = null;
+
+  // We are not using the timestamp returned by requestAnimationFrame
+  // because it may be either a Date.now-style time or a
+  // high-resolution time (depending on browser implementation). Using
+  // goog.now() will ensure that the timestamp used is consistent and
+  // compatible with goog.fx.Animation.
+  this.listener_.call(this.handler_, goog.now());
+};
+
+
+/** @override */
+goog.async.AnimationDelay.prototype.disposeInternal = function() {
+  this.stop();
+  goog.async.AnimationDelay.base(this, 'disposeInternal');
+};
+
+
+/**
+ * @return {?function(function(number)): number} The requestAnimationFrame
+ *     function, or null if not available on this browser.
+ * @private
+ */
+goog.async.AnimationDelay.prototype.getRaf_ = function() {
+  var win = this.win_;
+  return win.requestAnimationFrame ||
+      win.webkitRequestAnimationFrame ||
+      win.mozRequestAnimationFrame ||
+      win.oRequestAnimationFrame ||
+      win.msRequestAnimationFrame ||
+      null;
+};
+
+
+/**
+ * @return {?function(number): number} The cancelAnimationFrame function,
+ *     or null if not available on this browser.
+ * @private
+ */
+goog.async.AnimationDelay.prototype.getCancelRaf_ = function() {
+  var win = this.win_;
+  return win.cancelAnimationFrame ||
+      win.cancelRequestAnimationFrame ||
+      win.webkitCancelRequestAnimationFrame ||
+      win.mozCancelRequestAnimationFrame ||
+      win.oCancelRequestAnimationFrame ||
+      win.msCancelRequestAnimationFrame ||
+      null;
+};
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Provides a function to schedule running a function as soon
+ * as possible after the current JS execution stops and yields to the event
+ * loop.
+ *
+ */
+
+goog.provide('goog.async.nextTick');
+goog.provide('goog.async.throwException');
+
+goog.require('goog.debug.entryPointRegistry');
+goog.require('goog.dom.TagName');
+goog.require('goog.functions');
+goog.require('goog.labs.userAgent.browser');
+goog.require('goog.labs.userAgent.engine');
+
+
+/**
+ * Throw an item without interrupting the current execution context.  For
+ * example, if processing a group of items in a loop, sometimes it is useful
+ * to report an error while still allowing the rest of the batch to be
+ * processed.
+ * @param {*} exception
+ */
+goog.async.throwException = function(exception) {
+  // Each throw needs to be in its own context.
+  goog.global.setTimeout(function() { throw exception; }, 0);
+};
+
+
+/**
+ * Fires the provided callbacks as soon as possible after the current JS
+ * execution context. setTimeout(…, 0) takes at least 4ms when called from
+ * within another setTimeout(…, 0) for legacy reasons.
+ *
+ * This will not schedule the callback as a microtask (i.e. a task that can
+ * preempt user input or networking callbacks). It is meant to emulate what
+ * setTimeout(_, 0) would do if it were not throttled. If you desire microtask
+ * behavior, use {@see goog.Promise} instead.
+ *
+ * @param {function(this:SCOPE)} callback Callback function to fire as soon as
+ *     possible.
+ * @param {SCOPE=} opt_context Object in whose scope to call the listener.
+ * @param {boolean=} opt_useSetImmediate Avoid the IE workaround that
+ *     ensures correctness at the cost of speed. See comments for details.
+ * @template SCOPE
+ */
+goog.async.nextTick = function(callback, opt_context, opt_useSetImmediate) {
+  var cb = callback;
+  if (opt_context) {
+    cb = goog.bind(callback, opt_context);
+  }
+  cb = goog.async.nextTick.wrapCallback_(cb);
+  // window.setImmediate was introduced and currently only supported by IE10+,
+  // but due to a bug in the implementation it is not guaranteed that
+  // setImmediate is faster than setTimeout nor that setImmediate N is before
+  // setImmediate N+1. That is why we do not use the native version if
+  // available. We do, however, call setImmediate if it is a normal function
+  // because that indicates that it has been replaced by goog.testing.MockClock
+  // which we do want to support.
+  // See
+  // http://connect.microsoft.com/IE/feedback/details/801823/setimmediate-and-messagechannel-are-broken-in-ie10
+  //
+  // Note we do allow callers to also request setImmediate if they are willing
+  // to accept the possible tradeoffs of incorrectness in exchange for speed.
+  // The IE fallback of readystate change is much slower.
+  if (goog.isFunction(goog.global.setImmediate) &&
+      // Opt in.
+      (opt_useSetImmediate ||
+      // or it isn't a browser or the environment is weird
+      !goog.global.Window || !goog.global.Window.prototype ||
+      // or something redefined setImmediate in which case we (YOLO) decide
+      // to use it (This is so that we use the mockClock setImmediate. sigh).
+      goog.global.Window.prototype.setImmediate != goog.global.setImmediate)) {
+    goog.global.setImmediate(cb);
+    return;
+  }
+
+  // Look for and cache the custom fallback version of setImmediate.
+  if (!goog.async.nextTick.setImmediate_) {
+    goog.async.nextTick.setImmediate_ =
+        goog.async.nextTick.getSetImmediateEmulator_();
+  }
+  goog.async.nextTick.setImmediate_(cb);
+};
+
+
+/**
+ * Cache for the setImmediate implementation.
+ * @type {function(function())}
+ * @private
+ */
+goog.async.nextTick.setImmediate_;
+
+
+/**
+ * Determines the best possible implementation to run a function as soon as
+ * the JS event loop is idle.
+ * @return {function(function())} The "setImmediate" implementation.
+ * @private
+ */
+goog.async.nextTick.getSetImmediateEmulator_ = function() {
+  // Create a private message channel and use it to postMessage empty messages
+  // to ourselves.
+  var Channel = goog.global['MessageChannel'];
+  // If MessageChannel is not available and we are in a browser, implement
+  // an iframe based polyfill in browsers that have postMessage and
+  // document.addEventListener. The latter excludes IE8 because it has a
+  // synchronous postMessage implementation.
+  if (typeof Channel === 'undefined' && typeof window !== 'undefined' &&
+      window.postMessage && window.addEventListener &&
+      // Presto (The old pre-blink Opera engine) has problems with iframes
+      // and contentWindow.
+      !goog.labs.userAgent.engine.isPresto()) {
+    /** @constructor */
+    Channel = function() {
+      // Make an empty, invisible iframe.
+      var iframe = document.createElement(goog.dom.TagName.IFRAME);
+      iframe.style.display = 'none';
+      iframe.src = '';
+      document.documentElement.appendChild(iframe);
+      var win = iframe.contentWindow;
+      var doc = win.document;
+      doc.open();
+      doc.write('');
+      doc.close();
+      // Do not post anything sensitive over this channel, as the workaround for
+      // pages with file: origin could allow that information to be modified or
+      // intercepted.
+      var message = 'callImmediate' + Math.random();
+      // The same origin policy rejects attempts to postMessage from file: urls
+      // unless the origin is '*'.
+      // TODO(b/16335441): Use '*' origin for data: and other similar protocols.
+      var origin = win.location.protocol == 'file:' ?
+          '*' : win.location.protocol + '//' + win.location.host;
+      var onmessage = goog.bind(function(e) {
+        // Validate origin and message to make sure that this message was
+        // intended for us. If the origin is set to '*' (see above) only the
+        // message needs to match since, for example, '*' != 'file://'. Allowing
+        // the wildcard is ok, as we are not concerned with security here.
+        if ((origin != '*' && e.origin != origin) || e.data != message) {
+          return;
+        }
+        this['port1'].onmessage();
+      }, this);
+      win.addEventListener('message', onmessage, false);
+      this['port1'] = {};
+      this['port2'] = {
+        postMessage: function() {
+          win.postMessage(message, origin);
+        }
+      };
+    };
+  }
+  if (typeof Channel !== 'undefined' &&
+      (!goog.labs.userAgent.browser.isIE())) {
+    // Exclude all of IE due to
+    // http://codeforhire.com/2013/09/21/setimmediate-and-messagechannel-broken-on-internet-explorer-10/
+    // which allows starving postMessage with a busy setTimeout loop.
+    // This currently affects IE10 and IE11 which would otherwise be able
+    // to use the postMessage based fallbacks.
+    var channel = new Channel();
+    // Use a fifo linked list to call callbacks in the right order.
+    var head = {};
+    var tail = head;
+    channel['port1'].onmessage = function() {
+      if (goog.isDef(head.next)) {
+        head = head.next;
+        var cb = head.cb;
+        head.cb = null;
+        cb();
+      }
+    };
+    return function(cb) {
+      tail.next = {
+        cb: cb
+      };
+      tail = tail.next;
+      channel['port2'].postMessage(0);
+    };
+  }
+  // Implementation for IE6+: Script elements fire an asynchronous
+  // onreadystatechange event when inserted into the DOM.
+  if (typeof document !== 'undefined' && 'onreadystatechange' in
+      document.createElement(goog.dom.TagName.SCRIPT)) {
+    return function(cb) {
+      var script = document.createElement(goog.dom.TagName.SCRIPT);
+      script.onreadystatechange = function() {
+        // Clean up and call the callback.
+        script.onreadystatechange = null;
+        script.parentNode.removeChild(script);
+        script = null;
+        cb();
+        cb = null;
+      };
+      document.documentElement.appendChild(script);
+    };
+  }
+  // Fall back to setTimeout with 0. In browsers this creates a delay of 5ms
+  // or more.
+  return function(cb) {
+    goog.global.setTimeout(cb, 0);
+  };
+};
+
+
+/**
+ * Helper function that is overrided to protect callbacks with entry point
+ * monitor if the application monitors entry points.
+ * @param {function()} callback Callback function to fire as soon as possible.
+ * @return {function()} The wrapped callback.
+ * @private
+ */
+goog.async.nextTick.wrapCallback_ = goog.functions.identity;
+
+
+// Register the callback function as an entry point, so that it can be
+// monitored for exception handling, etc. This has to be done in this file
+// since it requires special code to handle all browsers.
+goog.debug.entryPointRegistry.register(
+    /**
+     * @param {function(!Function): !Function} transformer The transforming
+     *     function.
+     */
+    function(transformer) {
+      goog.async.nextTick.wrapCallback_ = transformer;
+    });
+
+// Copyright 2014 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview The SafeScript type and its builders.
+ *
+ * TODO(xtof): Link to document stating type contract.
+ */
+
+goog.provide('goog.html.SafeScript');
+
+goog.require('goog.asserts');
+goog.require('goog.string.Const');
+goog.require('goog.string.TypedString');
+
+
+
+/**
+ * A string-like object which represents JavaScript code and that carries the
+ * security type contract that its value, as a string, will not cause execution
+ * of unconstrained attacker controlled code (XSS) when evaluated as JavaScript
+ * in a browser.
+ *
+ * Instances of this type must be created via the factory method
+ * {@code goog.html.SafeScript.fromConstant} and not by invoking its
+ * constructor. The constructor intentionally takes no parameters and the type
+ * is immutable; hence only a default instance corresponding to the empty string
+ * can be obtained via constructor invocation.
+ *
+ * A SafeScript's string representation can safely be interpolated as the
+ * content of a script element within HTML. The SafeScript string should not be
+ * escaped before interpolation.
+ *
+ * Note that the SafeScript might contain text that is attacker-controlled but
+ * that text should have been interpolated with appropriate escaping,
+ * sanitization and/or validation into the right location in the script, such
+ * that it is highly constrained in its effect (for example, it had to match a
+ * set of whitelisted words).
+ *
+ * A SafeScript can be constructed via security-reviewed unchecked
+ * conversions. In this case producers of SafeScript must ensure themselves that
+ * the SafeScript does not contain unsafe script. Note in particular that
+ * {@code &lt;} is dangerous, even when inside JavaScript strings, and so should
+ * always be forbidden or JavaScript escaped in user controlled input. For
+ * example, if {@code &lt;/script&gt;&lt;script&gt;evil&lt;/script&gt;"} were
+ * interpolated inside a JavaScript string, it would break out of the context
+ * of the original script element and {@code evil} would execute. Also note
+ * that within an HTML script (raw text) element, HTML character references,
+ * such as "&lt;" are not allowed. See
+ * http://www.w3.org/TR/html5/scripting-1.html#restrictions-for-contents-of-script-elements.
+ *
+ * @see goog.html.SafeScript#fromConstant
+ * @constructor
+ * @final
+ * @struct
+ * @implements {goog.string.TypedString}
+ */
+goog.html.SafeScript = function() {
+  /**
+   * The contained value of this SafeScript.  The field has a purposely
+   * ugly name to make (non-compiled) code that attempts to directly access this
+   * field stand out.
+   * @private {string}
+   */
+  this.privateDoNotAccessOrElseSafeScriptWrappedValue_ = '';
+
+  /**
+   * A type marker used to implement additional run-time type checking.
+   * @see goog.html.SafeScript#unwrap
+   * @const
+   * @private
+   */
+  this.SAFE_SCRIPT_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ =
+      goog.html.SafeScript.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_;
+};
+
+
+/**
+ * @override
+ * @const
+ */
+goog.html.SafeScript.prototype.implementsGoogStringTypedString = true;
+
+
+/**
+ * Type marker for the SafeScript type, used to implement additional
+ * run-time type checking.
+ * @const {!Object}
+ * @private
+ */
+goog.html.SafeScript.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ = {};
+
+
+/**
+ * Creates a SafeScript object from a compile-time constant string.
+ *
+ * @param {!goog.string.Const} script A compile-time-constant string from which
+ *     to create a SafeScript.
+ * @return {!goog.html.SafeScript} A SafeScript object initialized to
+ *     {@code script}.
+ */
+goog.html.SafeScript.fromConstant = function(script) {
+  var scriptString = goog.string.Const.unwrap(script);
+  if (scriptString.length === 0) {
+    return goog.html.SafeScript.EMPTY;
+  }
+  return goog.html.SafeScript.createSafeScriptSecurityPrivateDoNotAccessOrElse(
+      scriptString);
+};
+
+
+/**
+ * Returns this SafeScript's value as a string.
+ *
+ * IMPORTANT: In code where it is security relevant that an object's type is
+ * indeed {@code SafeScript}, use {@code goog.html.SafeScript.unwrap} instead of
+ * this method. If in doubt, assume that it's security relevant. In particular,
+ * note that goog.html functions which return a goog.html type do not guarantee
+ * the returned instance is of the right type. For example:
+ *
+ * <pre>
+ * var fakeSafeHtml = new String('fake');
+ * fakeSafeHtml.__proto__ = goog.html.SafeHtml.prototype;
+ * var newSafeHtml = goog.html.SafeHtml.htmlEscape(fakeSafeHtml);
+ * // newSafeHtml is just an alias for fakeSafeHtml, it's passed through by
+ * // goog.html.SafeHtml.htmlEscape() as fakeSafeHtml
+ * // instanceof goog.html.SafeHtml.
+ * </pre>
+ *
+ * @see goog.html.SafeScript#unwrap
+ * @override
+ */
+goog.html.SafeScript.prototype.getTypedStringValue = function() {
+  return this.privateDoNotAccessOrElseSafeScriptWrappedValue_;
+};
+
+
+if (goog.DEBUG) {
+  /**
+   * Returns a debug string-representation of this value.
+   *
+   * To obtain the actual string value wrapped in a SafeScript, use
+   * {@code goog.html.SafeScript.unwrap}.
+   *
+   * @see goog.html.SafeScript#unwrap
+   * @override
+   */
+  goog.html.SafeScript.prototype.toString = function() {
+    return 'SafeScript{' +
+        this.privateDoNotAccessOrElseSafeScriptWrappedValue_ + '}';
+  };
+}
+
+
+/**
+ * Performs a runtime check that the provided object is indeed a
+ * SafeScript object, and returns its value.
+ *
+ * @param {!goog.html.SafeScript} safeScript The object to extract from.
+ * @return {string} The safeScript object's contained string, unless
+ *     the run-time type check fails. In that case, {@code unwrap} returns an
+ *     innocuous string, or, if assertions are enabled, throws
+ *     {@code goog.asserts.AssertionError}.
+ */
+goog.html.SafeScript.unwrap = function(safeScript) {
+  // Perform additional Run-time type-checking to ensure that
+  // safeScript is indeed an instance of the expected type.  This
+  // provides some additional protection against security bugs due to
+  // application code that disables type checks.
+  // Specifically, the following checks are performed:
+  // 1. The object is an instance of the expected type.
+  // 2. The object is not an instance of a subclass.
+  // 3. The object carries a type marker for the expected type. "Faking" an
+  // object requires a reference to the type marker, which has names intended
+  // to stand out in code reviews.
+  if (safeScript instanceof goog.html.SafeScript &&
+      safeScript.constructor === goog.html.SafeScript &&
+      safeScript.SAFE_SCRIPT_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ ===
+          goog.html.SafeScript.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_) {
+    return safeScript.privateDoNotAccessOrElseSafeScriptWrappedValue_;
+  } else {
+    goog.asserts.fail(
+        'expected object of type SafeScript, got \'' + safeScript + '\'');
+    return 'type_error:SafeScript';
+  }
+};
+
+
+/**
+ * Package-internal utility method to create SafeScript instances.
+ *
+ * @param {string} script The string to initialize the SafeScript object with.
+ * @return {!goog.html.SafeScript} The initialized SafeScript object.
+ * @package
+ */
+goog.html.SafeScript.createSafeScriptSecurityPrivateDoNotAccessOrElse =
+    function(script) {
+  return new goog.html.SafeScript().initSecurityPrivateDoNotAccessOrElse_(
+      script);
+};
+
+
+/**
+ * Called from createSafeScriptSecurityPrivateDoNotAccessOrElse(). This
+ * method exists only so that the compiler can dead code eliminate static
+ * fields (like EMPTY) when they're not accessed.
+ * @param {string} script
+ * @return {!goog.html.SafeScript}
+ * @private
+ */
+goog.html.SafeScript.prototype.initSecurityPrivateDoNotAccessOrElse_ = function(
+    script) {
+  this.privateDoNotAccessOrElseSafeScriptWrappedValue_ = script;
+  return this;
+};
+
+
+/**
+ * A SafeScript instance corresponding to the empty string.
+ * @const {!goog.html.SafeScript}
+ */
+goog.html.SafeScript.EMPTY =
+    goog.html.SafeScript.createSafeScriptSecurityPrivateDoNotAccessOrElse('');
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Unchecked conversions to create values of goog.html types from
+ * plain strings.  Use of these functions could potentially result in instances
+ * of goog.html types that violate their type contracts, and hence result in
+ * security vulnerabilties.
+ *
+ * Therefore, all uses of the methods herein must be carefully security
+ * reviewed.  Avoid use of the methods in this file whenever possible; instead
+ * prefer to create instances of goog.html types using inherently safe builders
+ * or template systems.
+ *
+ *
+ *
+ * @visibility {//closure/goog/html:approved_for_unchecked_conversion}
+ * @visibility {//closure/goog/bin/sizetests:__pkg__}
+ */
+
+
+goog.provide('goog.html.uncheckedconversions');
+
+goog.require('goog.asserts');
+goog.require('goog.html.SafeHtml');
+goog.require('goog.html.SafeScript');
+goog.require('goog.html.SafeStyle');
+goog.require('goog.html.SafeStyleSheet');
+goog.require('goog.html.SafeUrl');
+goog.require('goog.html.TrustedResourceUrl');
+goog.require('goog.string');
+goog.require('goog.string.Const');
+
+
+/**
+ * Performs an "unchecked conversion" to SafeHtml from a plain string that is
+ * known to satisfy the SafeHtml type contract.
+ *
+ * IMPORTANT: Uses of this method must be carefully security-reviewed to ensure
+ * that the value of {@code html} satisfies the SafeHtml type contract in all
+ * possible program states.
+ *
+ *
+ * @param {!goog.string.Const} justification A constant string explaining why
+ *     this use of this method is safe. May include a security review ticket
+ *     number.
+ * @param {string} html A string that is claimed to adhere to the SafeHtml
+ *     contract.
+ * @param {?goog.i18n.bidi.Dir=} opt_dir The optional directionality of the
+ *     SafeHtml to be constructed. A null or undefined value signifies an
+ *     unknown directionality.
+ * @return {!goog.html.SafeHtml} The value of html, wrapped in a SafeHtml
+ *     object.
+ * @suppress {visibility} For access to SafeHtml.create...  Note that this
+ *     use is appropriate since this method is intended to be "package private"
+ *     withing goog.html.  DO NOT call SafeHtml.create... from outside this
+ *     package; use appropriate wrappers instead.
+ */
+goog.html.uncheckedconversions.safeHtmlFromStringKnownToSatisfyTypeContract =
+    function(justification, html, opt_dir) {
+  // unwrap() called inside an assert so that justification can be optimized
+  // away in production code.
+  goog.asserts.assertString(goog.string.Const.unwrap(justification),
+                            'must provide justification');
+  goog.asserts.assert(
+      !goog.string.isEmptyOrWhitespace(goog.string.Const.unwrap(justification)),
+      'must provide non-empty justification');
+  return goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse(
+      html, opt_dir || null);
+};
+
+
+/**
+ * Performs an "unchecked conversion" to SafeScript from a plain string that is
+ * known to satisfy the SafeScript type contract.
+ *
+ * IMPORTANT: Uses of this method must be carefully security-reviewed to ensure
+ * that the value of {@code script} satisfies the SafeScript type contract in
+ * all possible program states.
+ *
+ *
+ * @param {!goog.string.Const} justification A constant string explaining why
+ *     this use of this method is safe. May include a security review ticket
+ *     number.
+ * @param {string} script The string to wrap as a SafeScript.
+ * @return {!goog.html.SafeScript} The value of {@code script}, wrapped in a
+ *     SafeScript object.
+ */
+goog.html.uncheckedconversions.safeScriptFromStringKnownToSatisfyTypeContract =
+    function(justification, script) {
+  // unwrap() called inside an assert so that justification can be optimized
+  // away in production code.
+  goog.asserts.assertString(goog.string.Const.unwrap(justification),
+                            'must provide justification');
+  goog.asserts.assert(
+      !goog.string.isEmpty(goog.string.Const.unwrap(justification)),
+      'must provide non-empty justification');
+  return goog.html.SafeScript.createSafeScriptSecurityPrivateDoNotAccessOrElse(
+      script);
+};
+
+
+/**
+ * Performs an "unchecked conversion" to SafeStyle from a plain string that is
+ * known to satisfy the SafeStyle type contract.
+ *
+ * IMPORTANT: Uses of this method must be carefully security-reviewed to ensure
+ * that the value of {@code style} satisfies the SafeUrl type contract in all
+ * possible program states.
+ *
+ *
+ * @param {!goog.string.Const} justification A constant string explaining why
+ *     this use of this method is safe. May include a security review ticket
+ *     number.
+ * @param {string} style The string to wrap as a SafeStyle.
+ * @return {!goog.html.SafeStyle} The value of {@code style}, wrapped in a
+ *     SafeStyle object.
+ */
+goog.html.uncheckedconversions.safeStyleFromStringKnownToSatisfyTypeContract =
+    function(justification, style) {
+  // unwrap() called inside an assert so that justification can be optimized
+  // away in production code.
+  goog.asserts.assertString(goog.string.Const.unwrap(justification),
+                            'must provide justification');
+  goog.asserts.assert(
+      !goog.string.isEmptyOrWhitespace(goog.string.Const.unwrap(justification)),
+      'must provide non-empty justification');
+  return goog.html.SafeStyle.createSafeStyleSecurityPrivateDoNotAccessOrElse(
+      style);
+};
+
+
+/**
+ * Performs an "unchecked conversion" to SafeStyleSheet from a plain string
+ * that is known to satisfy the SafeStyleSheet type contract.
+ *
+ * IMPORTANT: Uses of this method must be carefully security-reviewed to ensure
+ * that the value of {@code styleSheet} satisfies the SafeUrl type contract in
+ * all possible program states.
+ *
+ *
+ * @param {!goog.string.Const} justification A constant string explaining why
+ *     this use of this method is safe. May include a security review ticket
+ *     number.
+ * @param {string} styleSheet The string to wrap as a SafeStyleSheet.
+ * @return {!goog.html.SafeStyleSheet} The value of {@code styleSheet}, wrapped
+ *     in a SafeStyleSheet object.
+ */
+goog.html.uncheckedconversions.
+    safeStyleSheetFromStringKnownToSatisfyTypeContract =
+    function(justification, styleSheet) {
+  // unwrap() called inside an assert so that justification can be optimized
+  // away in production code.
+  goog.asserts.assertString(goog.string.Const.unwrap(justification),
+                            'must provide justification');
+  goog.asserts.assert(
+      !goog.string.isEmptyOrWhitespace(goog.string.Const.unwrap(justification)),
+      'must provide non-empty justification');
+  return goog.html.SafeStyleSheet.
+      createSafeStyleSheetSecurityPrivateDoNotAccessOrElse(styleSheet);
+};
+
+
+/**
+ * Performs an "unchecked conversion" to SafeUrl from a plain string that is
+ * known to satisfy the SafeUrl type contract.
+ *
+ * IMPORTANT: Uses of this method must be carefully security-reviewed to ensure
+ * that the value of {@code url} satisfies the SafeUrl type contract in all
+ * possible program states.
+ *
+ *
+ * @param {!goog.string.Const} justification A constant string explaining why
+ *     this use of this method is safe. May include a security review ticket
+ *     number.
+ * @param {string} url The string to wrap as a SafeUrl.
+ * @return {!goog.html.SafeUrl} The value of {@code url}, wrapped in a SafeUrl
+ *     object.
+ */
+goog.html.uncheckedconversions.safeUrlFromStringKnownToSatisfyTypeContract =
+    function(justification, url) {
+  // unwrap() called inside an assert so that justification can be optimized
+  // away in production code.
+  goog.asserts.assertString(goog.string.Const.unwrap(justification),
+                            'must provide justification');
+  goog.asserts.assert(
+      !goog.string.isEmptyOrWhitespace(goog.string.Const.unwrap(justification)),
+      'must provide non-empty justification');
+  return goog.html.SafeUrl.createSafeUrlSecurityPrivateDoNotAccessOrElse(url);
+};
+
+
+/**
+ * Performs an "unchecked conversion" to TrustedResourceUrl from a plain string
+ * that is known to satisfy the TrustedResourceUrl type contract.
+ *
+ * IMPORTANT: Uses of this method must be carefully security-reviewed to ensure
+ * that the value of {@code url} satisfies the TrustedResourceUrl type contract
+ * in all possible program states.
+ *
+ *
+ * @param {!goog.string.Const} justification A constant string explaining why
+ *     this use of this method is safe. May include a security review ticket
+ *     number.
+ * @param {string} url The string to wrap as a TrustedResourceUrl.
+ * @return {!goog.html.TrustedResourceUrl} The value of {@code url}, wrapped in
+ *     a TrustedResourceUrl object.
+ */
+goog.html.uncheckedconversions.
+    trustedResourceUrlFromStringKnownToSatisfyTypeContract =
+    function(justification, url) {
+  // unwrap() called inside an assert so that justification can be optimized
+  // away in production code.
+  goog.asserts.assertString(goog.string.Const.unwrap(justification),
+                            'must provide justification');
+  goog.asserts.assert(
+      !goog.string.isEmptyOrWhitespace(goog.string.Const.unwrap(justification)),
+      'must provide non-empty justification');
+  return goog.html.TrustedResourceUrl.
+      createTrustedResourceUrlSecurityPrivateDoNotAccessOrElse(url);
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Generics method for collection-like classes and objects.
+ *
+ * @author arv@google.com (Erik Arvidsson)
+ *
+ * This file contains functions to work with collections. It supports using
+ * Map, Set, Array and Object and other classes that implement collection-like
+ * methods.
+ */
+
+
+goog.provide('goog.structs');
+
+goog.require('goog.array');
+goog.require('goog.object');
+
+
+// We treat an object as a dictionary if it has getKeys or it is an object that
+// isn't arrayLike.
+
+
+/**
+ * Returns the number of values in the collection-like object.
+ * @param {Object} col The collection-like object.
+ * @return {number} The number of values in the collection-like object.
+ */
+goog.structs.getCount = function(col) {
+  if (typeof col.getCount == 'function') {
+    return col.getCount();
+  }
+  if (goog.isArrayLike(col) || goog.isString(col)) {
+    return col.length;
+  }
+  return goog.object.getCount(col);
+};
+
+
+/**
+ * Returns the values of the collection-like object.
+ * @param {Object} col The collection-like object.
+ * @return {!Array<?>} The values in the collection-like object.
+ */
+goog.structs.getValues = function(col) {
+  if (typeof col.getValues == 'function') {
+    return col.getValues();
+  }
+  if (goog.isString(col)) {
+    return col.split('');
+  }
+  if (goog.isArrayLike(col)) {
+    var rv = [];
+    var l = col.length;
+    for (var i = 0; i < l; i++) {
+      rv.push(col[i]);
+    }
+    return rv;
+  }
+  return goog.object.getValues(col);
+};
+
+
+/**
+ * Returns the keys of the collection. Some collections have no notion of
+ * keys/indexes and this function will return undefined in those cases.
+ * @param {Object} col The collection-like object.
+ * @return {!Array|undefined} The keys in the collection.
+ */
+goog.structs.getKeys = function(col) {
+  if (typeof col.getKeys == 'function') {
+    return col.getKeys();
+  }
+  // if we have getValues but no getKeys we know this is a key-less collection
+  if (typeof col.getValues == 'function') {
+    return undefined;
+  }
+  if (goog.isArrayLike(col) || goog.isString(col)) {
+    var rv = [];
+    var l = col.length;
+    for (var i = 0; i < l; i++) {
+      rv.push(i);
+    }
+    return rv;
+  }
+
+  return goog.object.getKeys(col);
+};
+
+
+/**
+ * Whether the collection contains the given value. This is O(n) and uses
+ * equals (==) to test the existence.
+ * @param {Object} col The collection-like object.
+ * @param {*} val The value to check for.
+ * @return {boolean} True if the map contains the value.
+ */
+goog.structs.contains = function(col, val) {
+  if (typeof col.contains == 'function') {
+    return col.contains(val);
+  }
+  if (typeof col.containsValue == 'function') {
+    return col.containsValue(val);
+  }
+  if (goog.isArrayLike(col) || goog.isString(col)) {
+    return goog.array.contains(/** @type {!Array<?>} */ (col), val);
+  }
+  return goog.object.containsValue(col, val);
+};
+
+
+/**
+ * Whether the collection is empty.
+ * @param {Object} col The collection-like object.
+ * @return {boolean} True if empty.
+ */
+goog.structs.isEmpty = function(col) {
+  if (typeof col.isEmpty == 'function') {
+    return col.isEmpty();
+  }
+
+  // We do not use goog.string.isEmptyOrWhitespace because here we treat the string as
+  // collection and as such even whitespace matters
+
+  if (goog.isArrayLike(col) || goog.isString(col)) {
+    return goog.array.isEmpty(/** @type {!Array<?>} */ (col));
+  }
+  return goog.object.isEmpty(col);
+};
+
+
+/**
+ * Removes all the elements from the collection.
+ * @param {Object} col The collection-like object.
+ */
+goog.structs.clear = function(col) {
+  // NOTE(arv): This should not contain strings because strings are immutable
+  if (typeof col.clear == 'function') {
+    col.clear();
+  } else if (goog.isArrayLike(col)) {
+    goog.array.clear(/** @type {goog.array.ArrayLike} */ (col));
+  } else {
+    goog.object.clear(col);
+  }
+};
+
+
+/**
+ * Calls a function for each value in a collection. The function takes
+ * three arguments; the value, the key and the collection.
+ *
+ * NOTE: This will be deprecated soon! Please use a more specific method if
+ * possible, e.g. goog.array.forEach, goog.object.forEach, etc.
+ *
+ * @param {S} col The collection-like object.
+ * @param {function(this:T,?,?,S):?} f The function to call for every value.
+ *     This function takes
+ *     3 arguments (the value, the key or undefined if the collection has no
+ *     notion of keys, and the collection) and the return value is irrelevant.
+ * @param {T=} opt_obj The object to be used as the value of 'this'
+ *     within {@code f}.
+ * @template T,S
+ */
+goog.structs.forEach = function(col, f, opt_obj) {
+  if (typeof col.forEach == 'function') {
+    col.forEach(f, opt_obj);
+  } else if (goog.isArrayLike(col) || goog.isString(col)) {
+    goog.array.forEach(/** @type {!Array<?>} */ (col), f, opt_obj);
+  } else {
+    var keys = goog.structs.getKeys(col);
+    var values = goog.structs.getValues(col);
+    var l = values.length;
+    for (var i = 0; i < l; i++) {
+      f.call(opt_obj, values[i], keys && keys[i], col);
+    }
+  }
+};
+
+
+/**
+ * Calls a function for every value in the collection. When a call returns true,
+ * adds the value to a new collection (Array is returned by default).
+ *
+ * @param {S} col The collection-like object.
+ * @param {function(this:T,?,?,S):boolean} f The function to call for every
+ *     value. This function takes
+ *     3 arguments (the value, the key or undefined if the collection has no
+ *     notion of keys, and the collection) and should return a Boolean. If the
+ *     return value is true the value is added to the result collection. If it
+ *     is false the value is not included.
+ * @param {T=} opt_obj The object to be used as the value of 'this'
+ *     within {@code f}.
+ * @return {!Object|!Array<?>} A new collection where the passed values are
+ *     present. If col is a key-less collection an array is returned.  If col
+ *     has keys and values a plain old JS object is returned.
+ * @template T,S
+ */
+goog.structs.filter = function(col, f, opt_obj) {
+  if (typeof col.filter == 'function') {
+    return col.filter(f, opt_obj);
+  }
+  if (goog.isArrayLike(col) || goog.isString(col)) {
+    return goog.array.filter(/** @type {!Array<?>} */ (col), f, opt_obj);
+  }
+
+  var rv;
+  var keys = goog.structs.getKeys(col);
+  var values = goog.structs.getValues(col);
+  var l = values.length;
+  if (keys) {
+    rv = {};
+    for (var i = 0; i < l; i++) {
+      if (f.call(opt_obj, values[i], keys[i], col)) {
+        rv[keys[i]] = values[i];
+      }
+    }
+  } else {
+    // We should not use goog.array.filter here since we want to make sure that
+    // the index is undefined as well as make sure that col is passed to the
+    // function.
+    rv = [];
+    for (var i = 0; i < l; i++) {
+      if (f.call(opt_obj, values[i], undefined, col)) {
+        rv.push(values[i]);
+      }
+    }
+  }
+  return rv;
+};
+
+
+/**
+ * Calls a function for every value in the collection and adds the result into a
+ * new collection (defaults to creating a new Array).
+ *
+ * @param {S} col The collection-like object.
+ * @param {function(this:T,?,?,S):V} f The function to call for every value.
+ *     This function takes 3 arguments (the value, the key or undefined if the
+ *     collection has no notion of keys, and the collection) and should return
+ *     something. The result will be used as the value in the new collection.
+ * @param {T=} opt_obj  The object to be used as the value of 'this'
+ *     within {@code f}.
+ * @return {!Object<V>|!Array<V>} A new collection with the new values.  If
+ *     col is a key-less collection an array is returned.  If col has keys and
+ *     values a plain old JS object is returned.
+ * @template T,S,V
+ */
+goog.structs.map = function(col, f, opt_obj) {
+  if (typeof col.map == 'function') {
+    return col.map(f, opt_obj);
+  }
+  if (goog.isArrayLike(col) || goog.isString(col)) {
+    return goog.array.map(/** @type {!Array<?>} */ (col), f, opt_obj);
+  }
+
+  var rv;
+  var keys = goog.structs.getKeys(col);
+  var values = goog.structs.getValues(col);
+  var l = values.length;
+  if (keys) {
+    rv = {};
+    for (var i = 0; i < l; i++) {
+      rv[keys[i]] = f.call(opt_obj, values[i], keys[i], col);
+    }
+  } else {
+    // We should not use goog.array.map here since we want to make sure that
+    // the index is undefined as well as make sure that col is passed to the
+    // function.
+    rv = [];
+    for (var i = 0; i < l; i++) {
+      rv[i] = f.call(opt_obj, values[i], undefined, col);
+    }
+  }
+  return rv;
+};
+
+
+/**
+ * Calls f for each value in a collection. If any call returns true this returns
+ * true (without checking the rest). If all returns false this returns false.
+ *
+ * @param {S} col The collection-like object.
+ * @param {function(this:T,?,?,S):boolean} f The function to call for every
+ *     value. This function takes 3 arguments (the value, the key or undefined
+ *     if the collection has no notion of keys, and the collection) and should
+ *     return a boolean.
+ * @param {T=} opt_obj  The object to be used as the value of 'this'
+ *     within {@code f}.
+ * @return {boolean} True if any value passes the test.
+ * @template T,S
+ */
+goog.structs.some = function(col, f, opt_obj) {
+  if (typeof col.some == 'function') {
+    return col.some(f, opt_obj);
+  }
+  if (goog.isArrayLike(col) || goog.isString(col)) {
+    return goog.array.some(/** @type {!Array<?>} */ (col), f, opt_obj);
+  }
+  var keys = goog.structs.getKeys(col);
+  var values = goog.structs.getValues(col);
+  var l = values.length;
+  for (var i = 0; i < l; i++) {
+    if (f.call(opt_obj, values[i], keys && keys[i], col)) {
+      return true;
+    }
+  }
+  return false;
+};
+
+
+/**
+ * Calls f for each value in a collection. If all calls return true this return
+ * true this returns true. If any returns false this returns false at this point
+ *  and does not continue to check the remaining values.
+ *
+ * @param {S} col The collection-like object.
+ * @param {function(this:T,?,?,S):boolean} f The function to call for every
+ *     value. This function takes 3 arguments (the value, the key or
+ *     undefined if the collection has no notion of keys, and the collection)
+ *     and should return a boolean.
+ * @param {T=} opt_obj  The object to be used as the value of 'this'
+ *     within {@code f}.
+ * @return {boolean} True if all key-value pairs pass the test.
+ * @template T,S
+ */
+goog.structs.every = function(col, f, opt_obj) {
+  if (typeof col.every == 'function') {
+    return col.every(f, opt_obj);
+  }
+  if (goog.isArrayLike(col) || goog.isString(col)) {
+    return goog.array.every(/** @type {!Array<?>} */ (col), f, opt_obj);
+  }
+  var keys = goog.structs.getKeys(col);
+  var values = goog.structs.getValues(col);
+  var l = values.length;
+  for (var i = 0; i < l; i++) {
+    if (!f.call(opt_obj, values[i], keys && keys[i], col)) {
+      return false;
+    }
+  }
+  return true;
+};
+
+// Copyright 2011 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Defines the collection interface.
+ *
+ * @author nnaze@google.com (Nathan Naze)
+ */
+
+goog.provide('goog.structs.Collection');
+
+
+
+/**
+ * An interface for a collection of values.
+ * @interface
+ * @template T
+ */
+goog.structs.Collection = function() {};
+
+
+/**
+ * @param {T} value Value to add to the collection.
+ */
+goog.structs.Collection.prototype.add;
+
+
+/**
+ * @param {T} value Value to remove from the collection.
+ */
+goog.structs.Collection.prototype.remove;
+
+
+/**
+ * @param {T} value Value to find in the collection.
+ * @return {boolean} Whether the collection contains the specified value.
+ */
+goog.structs.Collection.prototype.contains;
+
+
+/**
+ * @return {number} The number of values stored in the collection.
+ */
+goog.structs.Collection.prototype.getCount;
+
+
+// Copyright 2007 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Python style iteration utilities.
+ * @author arv@google.com (Erik Arvidsson)
+ */
+
+
+goog.provide('goog.iter');
+goog.provide('goog.iter.Iterable');
+goog.provide('goog.iter.Iterator');
+goog.provide('goog.iter.StopIteration');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.functions');
+goog.require('goog.math');
+
+
+/**
+ * @typedef {goog.iter.Iterator|{length:number}|{__iterator__}}
+ */
+goog.iter.Iterable;
+
+
+/**
+ * Singleton Error object that is used to terminate iterations.
+ * @const {!Error}
+ */
+goog.iter.StopIteration = ('StopIteration' in goog.global) ?
+    // For script engines that support legacy iterators.
+    goog.global['StopIteration'] :
+    { message: 'StopIteration', stack: ''};
+
+
+
+/**
+ * Class/interface for iterators.  An iterator needs to implement a {@code next}
+ * method and it needs to throw a {@code goog.iter.StopIteration} when the
+ * iteration passes beyond the end.  Iterators have no {@code hasNext} method.
+ * It is recommended to always use the helper functions to iterate over the
+ * iterator or in case you are only targeting JavaScript 1.7 for in loops.
+ * @constructor
+ * @template VALUE
+ */
+goog.iter.Iterator = function() {};
+
+
+/**
+ * Returns the next value of the iteration.  This will throw the object
+ * {@see goog.iter#StopIteration} when the iteration passes the end.
+ * @return {VALUE} Any object or value.
+ */
+goog.iter.Iterator.prototype.next = function() {
+  throw goog.iter.StopIteration;
+};
+
+
+/**
+ * Returns the {@code Iterator} object itself.  This is used to implement
+ * the iterator protocol in JavaScript 1.7
+ * @param {boolean=} opt_keys  Whether to return the keys or values. Default is
+ *     to only return the values.  This is being used by the for-in loop (true)
+ *     and the for-each-in loop (false).  Even though the param gives a hint
+ *     about what the iterator will return there is no guarantee that it will
+ *     return the keys when true is passed.
+ * @return {!goog.iter.Iterator<VALUE>} The object itself.
+ */
+goog.iter.Iterator.prototype.__iterator__ = function(opt_keys) {
+  return this;
+};
+
+
+/**
+ * Returns an iterator that knows how to iterate over the values in the object.
+ * @param {goog.iter.Iterator<VALUE>|goog.iter.Iterable} iterable  If the
+ *     object is an iterator it will be returned as is.  If the object has an
+ *     {@code __iterator__} method that will be called to get the value
+ *     iterator.  If the object is an array-like object we create an iterator
+ *     for that.
+ * @return {!goog.iter.Iterator<VALUE>} An iterator that knows how to iterate
+ *     over the values in {@code iterable}.
+ * @template VALUE
+ */
+goog.iter.toIterator = function(iterable) {
+  if (iterable instanceof goog.iter.Iterator) {
+    return iterable;
+  }
+  if (typeof iterable.__iterator__ == 'function') {
+    return iterable.__iterator__(false);
+  }
+  if (goog.isArrayLike(iterable)) {
+    var i = 0;
+    var newIter = new goog.iter.Iterator;
+    newIter.next = function() {
+      while (true) {
+        if (i >= iterable.length) {
+          throw goog.iter.StopIteration;
+        }
+        // Don't include deleted elements.
+        if (!(i in iterable)) {
+          i++;
+          continue;
+        }
+        return iterable[i++];
+      }
+    };
+    return newIter;
+  }
+
+
+  // TODO(arv): Should we fall back on goog.structs.getValues()?
+  throw Error('Not implemented');
+};
+
+
+/**
+ * Calls a function for each element in the iterator with the element of the
+ * iterator passed as argument.
+ *
+ * @param {goog.iter.Iterator<VALUE>|goog.iter.Iterable} iterable  The iterator
+ *     to iterate over. If the iterable is an object {@code toIterator} will be
+ *     called on it.
+ * @param {function(this:THIS,VALUE,?,!goog.iter.Iterator<VALUE>)} f
+ *     The function to call for every element.  This function takes 3 arguments
+ *     (the element, undefined, and the iterator) and the return value is
+ *     irrelevant.  The reason for passing undefined as the second argument is
+ *     so that the same function can be used in {@see goog.array#forEach} as
+ *     well as others.  The third parameter is of type "number" for
+ *     arraylike objects, undefined, otherwise.
+ * @param {THIS=} opt_obj  The object to be used as the value of 'this' within
+ *     {@code f}.
+ * @template THIS, VALUE
+ */
+goog.iter.forEach = function(iterable, f, opt_obj) {
+  if (goog.isArrayLike(iterable)) {
+    /** @preserveTry */
+    try {
+      // NOTES: this passes the index number to the second parameter
+      // of the callback contrary to the documentation above.
+      goog.array.forEach(/** @type {goog.array.ArrayLike} */(iterable), f,
+                         opt_obj);
+    } catch (ex) {
+      if (ex !== goog.iter.StopIteration) {
+        throw ex;
+      }
+    }
+  } else {
+    iterable = goog.iter.toIterator(iterable);
+    /** @preserveTry */
+    try {
+      while (true) {
+        f.call(opt_obj, iterable.next(), undefined, iterable);
+      }
+    } catch (ex) {
+      if (ex !== goog.iter.StopIteration) {
+        throw ex;
+      }
+    }
+  }
+};
+
+
+/**
+ * Calls a function for every element in the iterator, and if the function
+ * returns true adds the element to a new iterator.
+ *
+ * @param {goog.iter.Iterator<VALUE>|goog.iter.Iterable} iterable The iterator
+ *     to iterate over.
+ * @param {
+ *     function(this:THIS,VALUE,undefined,!goog.iter.Iterator<VALUE>):boolean} f
+ *     The function to call for every element. This function takes 3 arguments
+ *     (the element, undefined, and the iterator) and should return a boolean.
+ *     If the return value is true the element will be included in the returned
+ *     iterator.  If it is false the element is not included.
+ * @param {THIS=} opt_obj The object to be used as the value of 'this' within
+ *     {@code f}.
+ * @return {!goog.iter.Iterator<VALUE>} A new iterator in which only elements
+ *     that passed the test are present.
+ * @template THIS, VALUE
+ */
+goog.iter.filter = function(iterable, f, opt_obj) {
+  var iterator = goog.iter.toIterator(iterable);
+  var newIter = new goog.iter.Iterator;
+  newIter.next = function() {
+    while (true) {
+      var val = iterator.next();
+      if (f.call(opt_obj, val, undefined, iterator)) {
+        return val;
+      }
+    }
+  };
+  return newIter;
+};
+
+
+/**
+ * Calls a function for every element in the iterator, and if the function
+ * returns false adds the element to a new iterator.
+ *
+ * @param {goog.iter.Iterator<VALUE>|goog.iter.Iterable} iterable The iterator
+ *     to iterate over.
+ * @param {
+ *     function(this:THIS,VALUE,undefined,!goog.iter.Iterator<VALUE>):boolean} f
+ *     The function to call for every element. This function takes 3 arguments
+ *     (the element, undefined, and the iterator) and should return a boolean.
+ *     If the return value is false the element will be included in the returned
+ *     iterator.  If it is true the element is not included.
+ * @param {THIS=} opt_obj The object to be used as the value of 'this' within
+ *     {@code f}.
+ * @return {!goog.iter.Iterator<VALUE>} A new iterator in which only elements
+ *     that did not pass the test are present.
+ * @template THIS, VALUE
+ */
+goog.iter.filterFalse = function(iterable, f, opt_obj) {
+  return goog.iter.filter(iterable, goog.functions.not(f), opt_obj);
+};
+
+
+/**
+ * Creates a new iterator that returns the values in a range.  This function
+ * can take 1, 2 or 3 arguments:
+ * <pre>
+ * range(5) same as range(0, 5, 1)
+ * range(2, 5) same as range(2, 5, 1)
+ * </pre>
+ *
+ * @param {number} startOrStop  The stop value if only one argument is provided.
+ *     The start value if 2 or more arguments are provided.  If only one
+ *     argument is used the start value is 0.
+ * @param {number=} opt_stop  The stop value.  If left out then the first
+ *     argument is used as the stop value.
+ * @param {number=} opt_step  The number to increment with between each call to
+ *     next.  This can be negative.
+ * @return {!goog.iter.Iterator<number>} A new iterator that returns the values
+ *     in the range.
+ */
+goog.iter.range = function(startOrStop, opt_stop, opt_step) {
+  var start = 0;
+  var stop = startOrStop;
+  var step = opt_step || 1;
+  if (arguments.length > 1) {
+    start = startOrStop;
+    stop = opt_stop;
+  }
+  if (step == 0) {
+    throw Error('Range step argument must not be zero');
+  }
+
+  var newIter = new goog.iter.Iterator;
+  newIter.next = function() {
+    if (step > 0 && start >= stop || step < 0 && start <= stop) {
+      throw goog.iter.StopIteration;
+    }
+    var rv = start;
+    start += step;
+    return rv;
+  };
+  return newIter;
+};
+
+
+/**
+ * Joins the values in a iterator with a delimiter.
+ * @param {goog.iter.Iterator<VALUE>|goog.iter.Iterable} iterable The iterator
+ *     to get the values from.
+ * @param {string} deliminator  The text to put between the values.
+ * @return {string} The joined value string.
+ * @template VALUE
+ */
+goog.iter.join = function(iterable, deliminator) {
+  return goog.iter.toArray(iterable).join(deliminator);
+};
+
+
+/**
+ * For every element in the iterator call a function and return a new iterator
+ * with that value.
+ *
+ * @param {!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} iterable The
+ *     iterator to iterate over.
+ * @param {
+ *     function(this:THIS,VALUE,undefined,!goog.iter.Iterator<VALUE>):RESULT} f
+ *     The function to call for every element.  This function takes 3 arguments
+ *     (the element, undefined, and the iterator) and should return a new value.
+ * @param {THIS=} opt_obj The object to be used as the value of 'this' within
+ *     {@code f}.
+ * @return {!goog.iter.Iterator<RESULT>} A new iterator that returns the
+ *     results of applying the function to each element in the original
+ *     iterator.
+ * @template THIS, VALUE, RESULT
+ */
+goog.iter.map = function(iterable, f, opt_obj) {
+  var iterator = goog.iter.toIterator(iterable);
+  var newIter = new goog.iter.Iterator;
+  newIter.next = function() {
+    var val = iterator.next();
+    return f.call(opt_obj, val, undefined, iterator);
+  };
+  return newIter;
+};
+
+
+/**
+ * Passes every element of an iterator into a function and accumulates the
+ * result.
+ *
+ * @param {goog.iter.Iterator<VALUE>|goog.iter.Iterable} iterable The iterator
+ *     to iterate over.
+ * @param {function(this:THIS,VALUE,VALUE):VALUE} f The function to call for
+ *     every element. This function takes 2 arguments (the function's previous
+ *     result or the initial value, and the value of the current element).
+ *     function(previousValue, currentElement) : newValue.
+ * @param {VALUE} val The initial value to pass into the function on the first
+ *     call.
+ * @param {THIS=} opt_obj  The object to be used as the value of 'this' within
+ *     f.
+ * @return {VALUE} Result of evaluating f repeatedly across the values of
+ *     the iterator.
+ * @template THIS, VALUE
+ */
+goog.iter.reduce = function(iterable, f, val, opt_obj) {
+  var rval = val;
+  goog.iter.forEach(iterable, function(val) {
+    rval = f.call(opt_obj, rval, val);
+  });
+  return rval;
+};
+
+
+/**
+ * Goes through the values in the iterator. Calls f for each of these, and if
+ * any of them returns true, this returns true (without checking the rest). If
+ * all return false this will return false.
+ *
+ * @param {goog.iter.Iterator<VALUE>|goog.iter.Iterable} iterable The iterator
+ *     object.
+ * @param {
+ *     function(this:THIS,VALUE,undefined,!goog.iter.Iterator<VALUE>):boolean} f
+ *     The function to call for every value. This function takes 3 arguments
+ *     (the value, undefined, and the iterator) and should return a boolean.
+ * @param {THIS=} opt_obj The object to be used as the value of 'this' within
+ *     {@code f}.
+ * @return {boolean} true if any value passes the test.
+ * @template THIS, VALUE
+ */
+goog.iter.some = function(iterable, f, opt_obj) {
+  iterable = goog.iter.toIterator(iterable);
+  /** @preserveTry */
+  try {
+    while (true) {
+      if (f.call(opt_obj, iterable.next(), undefined, iterable)) {
+        return true;
+      }
+    }
+  } catch (ex) {
+    if (ex !== goog.iter.StopIteration) {
+      throw ex;
+    }
+  }
+  return false;
+};
+
+
+/**
+ * Goes through the values in the iterator. Calls f for each of these and if any
+ * of them returns false this returns false (without checking the rest). If all
+ * return true this will return true.
+ *
+ * @param {goog.iter.Iterator<VALUE>|goog.iter.Iterable} iterable The iterator
+ *     object.
+ * @param {
+ *     function(this:THIS,VALUE,undefined,!goog.iter.Iterator<VALUE>):boolean} f
+ *     The function to call for every value. This function takes 3 arguments
+ *     (the value, undefined, and the iterator) and should return a boolean.
+ * @param {THIS=} opt_obj The object to be used as the value of 'this' within
+ *     {@code f}.
+ * @return {boolean} true if every value passes the test.
+ * @template THIS, VALUE
+ */
+goog.iter.every = function(iterable, f, opt_obj) {
+  iterable = goog.iter.toIterator(iterable);
+  /** @preserveTry */
+  try {
+    while (true) {
+      if (!f.call(opt_obj, iterable.next(), undefined, iterable)) {
+        return false;
+      }
+    }
+  } catch (ex) {
+    if (ex !== goog.iter.StopIteration) {
+      throw ex;
+    }
+  }
+  return true;
+};
+
+
+/**
+ * Takes zero or more iterables and returns one iterator that will iterate over
+ * them in the order chained.
+ * @param {...!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} var_args Any
+ *     number of iterable objects.
+ * @return {!goog.iter.Iterator<VALUE>} Returns a new iterator that will
+ *     iterate over all the given iterables' contents.
+ * @template VALUE
+ */
+goog.iter.chain = function(var_args) {
+  return goog.iter.chainFromIterable(arguments);
+};
+
+
+/**
+ * Takes a single iterable containing zero or more iterables and returns one
+ * iterator that will iterate over each one in the order given.
+ * @see http://docs.python.org/2/library/itertools.html#itertools.chain.from_iterable
+ * @param {goog.iter.Iterable} iterable The iterable of iterables to chain.
+ * @return {!goog.iter.Iterator<VALUE>} Returns a new iterator that will
+ *     iterate over all the contents of the iterables contained within
+ *     {@code iterable}.
+ * @template VALUE
+ */
+goog.iter.chainFromIterable = function(iterable) {
+  var iterator = goog.iter.toIterator(iterable);
+  var iter = new goog.iter.Iterator();
+  var current = null;
+
+  iter.next = function() {
+    while (true) {
+      if (current == null) {
+        var it = iterator.next();
+        current = goog.iter.toIterator(it);
+      }
+      try {
+        return current.next();
+      } catch (ex) {
+        if (ex !== goog.iter.StopIteration) {
+          throw ex;
+        }
+        current = null;
+      }
+    }
+  };
+
+  return iter;
+};
+
+
+/**
+ * Builds a new iterator that iterates over the original, but skips elements as
+ * long as a supplied function returns true.
+ * @param {goog.iter.Iterator<VALUE>|goog.iter.Iterable} iterable The iterator
+ *     object.
+ * @param {
+ *     function(this:THIS,VALUE,undefined,!goog.iter.Iterator<VALUE>):boolean} f
+ *     The function to call for every value. This function takes 3 arguments
+ *     (the value, undefined, and the iterator) and should return a boolean.
+ * @param {THIS=} opt_obj The object to be used as the value of 'this' within
+ *     {@code f}.
+ * @return {!goog.iter.Iterator<VALUE>} A new iterator that drops elements from
+ *     the original iterator as long as {@code f} is true.
+ * @template THIS, VALUE
+ */
+goog.iter.dropWhile = function(iterable, f, opt_obj) {
+  var iterator = goog.iter.toIterator(iterable);
+  var newIter = new goog.iter.Iterator;
+  var dropping = true;
+  newIter.next = function() {
+    while (true) {
+      var val = iterator.next();
+      if (dropping && f.call(opt_obj, val, undefined, iterator)) {
+        continue;
+      } else {
+        dropping = false;
+      }
+      return val;
+    }
+  };
+  return newIter;
+};
+
+
+/**
+ * Builds a new iterator that iterates over the original, but only as long as a
+ * supplied function returns true.
+ * @param {goog.iter.Iterator<VALUE>|goog.iter.Iterable} iterable The iterator
+ *     object.
+ * @param {
+ *     function(this:THIS,VALUE,undefined,!goog.iter.Iterator<VALUE>):boolean} f
+ *     The function to call for every value. This function takes 3 arguments
+ *     (the value, undefined, and the iterator) and should return a boolean.
+ * @param {THIS=} opt_obj This is used as the 'this' object in f when called.
+ * @return {!goog.iter.Iterator<VALUE>} A new iterator that keeps elements in
+ *     the original iterator as long as the function is true.
+ * @template THIS, VALUE
+ */
+goog.iter.takeWhile = function(iterable, f, opt_obj) {
+  var iterator = goog.iter.toIterator(iterable);
+  var iter = new goog.iter.Iterator();
+  iter.next = function() {
+    var val = iterator.next();
+    if (f.call(opt_obj, val, undefined, iterator)) {
+      return val;
+    }
+    throw goog.iter.StopIteration;
+  };
+  return iter;
+};
+
+
+/**
+ * Converts the iterator to an array
+ * @param {goog.iter.Iterator<VALUE>|goog.iter.Iterable} iterable The iterator
+ *     to convert to an array.
+ * @return {!Array<VALUE>} An array of the elements the iterator iterates over.
+ * @template VALUE
+ */
+goog.iter.toArray = function(iterable) {
+  // Fast path for array-like.
+  if (goog.isArrayLike(iterable)) {
+    return goog.array.toArray(/** @type {!goog.array.ArrayLike} */(iterable));
+  }
+  iterable = goog.iter.toIterator(iterable);
+  var array = [];
+  goog.iter.forEach(iterable, function(val) {
+    array.push(val);
+  });
+  return array;
+};
+
+
+/**
+ * Iterates over two iterables and returns true if they contain the same
+ * sequence of elements and have the same length.
+ * @param {!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} iterable1 The first
+ *     iterable object.
+ * @param {!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} iterable2 The second
+ *     iterable object.
+ * @param {function(VALUE,VALUE):boolean=} opt_equalsFn Optional comparison
+ *     function.
+ *     Should take two arguments to compare, and return true if the arguments
+ *     are equal. Defaults to {@link goog.array.defaultCompareEquality} which
+ *     compares the elements using the built-in '===' operator.
+ * @return {boolean} true if the iterables contain the same sequence of elements
+ *     and have the same length.
+ * @template VALUE
+ */
+goog.iter.equals = function(iterable1, iterable2, opt_equalsFn) {
+  var fillValue = {};
+  var pairs = goog.iter.zipLongest(fillValue, iterable1, iterable2);
+  var equalsFn = opt_equalsFn || goog.array.defaultCompareEquality;
+  return goog.iter.every(pairs, function(pair) {
+    return equalsFn(pair[0], pair[1]);
+  });
+};
+
+
+/**
+ * Advances the iterator to the next position, returning the given default value
+ * instead of throwing an exception if the iterator has no more entries.
+ * @param {goog.iter.Iterator<VALUE>|goog.iter.Iterable} iterable The iterable
+ *     object.
+ * @param {VALUE} defaultValue The value to return if the iterator is empty.
+ * @return {VALUE} The next item in the iteration, or defaultValue if the
+ *     iterator was empty.
+ * @template VALUE
+ */
+goog.iter.nextOrValue = function(iterable, defaultValue) {
+  try {
+    return goog.iter.toIterator(iterable).next();
+  } catch (e) {
+    if (e != goog.iter.StopIteration) {
+      throw e;
+    }
+    return defaultValue;
+  }
+};
+
+
+/**
+ * Cartesian product of zero or more sets.  Gives an iterator that gives every
+ * combination of one element chosen from each set.  For example,
+ * ([1, 2], [3, 4]) gives ([1, 3], [1, 4], [2, 3], [2, 4]).
+ * @see http://docs.python.org/library/itertools.html#itertools.product
+ * @param {...!goog.array.ArrayLike<VALUE>} var_args Zero or more sets, as
+ *     arrays.
+ * @return {!goog.iter.Iterator<!Array<VALUE>>} An iterator that gives each
+ *     n-tuple (as an array).
+ * @template VALUE
+ */
+goog.iter.product = function(var_args) {
+  var someArrayEmpty = goog.array.some(arguments, function(arr) {
+    return !arr.length;
+  });
+
+  // An empty set in a cartesian product gives an empty set.
+  if (someArrayEmpty || !arguments.length) {
+    return new goog.iter.Iterator();
+  }
+
+  var iter = new goog.iter.Iterator();
+  var arrays = arguments;
+
+  // The first indices are [0, 0, ...]
+  var indicies = goog.array.repeat(0, arrays.length);
+
+  iter.next = function() {
+
+    if (indicies) {
+      var retVal = goog.array.map(indicies, function(valueIndex, arrayIndex) {
+        return arrays[arrayIndex][valueIndex];
+      });
+
+      // Generate the next-largest indices for the next call.
+      // Increase the rightmost index. If it goes over, increase the next
+      // rightmost (like carry-over addition).
+      for (var i = indicies.length - 1; i >= 0; i--) {
+        // Assertion prevents compiler warning below.
+        goog.asserts.assert(indicies);
+        if (indicies[i] < arrays[i].length - 1) {
+          indicies[i]++;
+          break;
+        }
+
+        // We're at the last indices (the last element of every array), so
+        // the iteration is over on the next call.
+        if (i == 0) {
+          indicies = null;
+          break;
+        }
+        // Reset the index in this column and loop back to increment the
+        // next one.
+        indicies[i] = 0;
+      }
+      return retVal;
+    }
+
+    throw goog.iter.StopIteration;
+  };
+
+  return iter;
+};
+
+
+/**
+ * Create an iterator to cycle over the iterable's elements indefinitely.
+ * For example, ([1, 2, 3]) would return : 1, 2, 3, 1, 2, 3, ...
+ * @see: http://docs.python.org/library/itertools.html#itertools.cycle.
+ * @param {!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} iterable The
+ *     iterable object.
+ * @return {!goog.iter.Iterator<VALUE>} An iterator that iterates indefinitely
+ *     over the values in {@code iterable}.
+ * @template VALUE
+ */
+goog.iter.cycle = function(iterable) {
+  var baseIterator = goog.iter.toIterator(iterable);
+
+  // We maintain a cache to store the iterable elements as we iterate
+  // over them. The cache is used to return elements once we have
+  // iterated over the iterable once.
+  var cache = [];
+  var cacheIndex = 0;
+
+  var iter = new goog.iter.Iterator();
+
+  // This flag is set after the iterable is iterated over once
+  var useCache = false;
+
+  iter.next = function() {
+    var returnElement = null;
+
+    // Pull elements off the original iterator if not using cache
+    if (!useCache) {
+      try {
+        // Return the element from the iterable
+        returnElement = baseIterator.next();
+        cache.push(returnElement);
+        return returnElement;
+      } catch (e) {
+        // If an exception other than StopIteration is thrown
+        // or if there are no elements to iterate over (the iterable was empty)
+        // throw an exception
+        if (e != goog.iter.StopIteration || goog.array.isEmpty(cache)) {
+          throw e;
+        }
+        // set useCache to true after we know that a 'StopIteration' exception
+        // was thrown and the cache is not empty (to handle the 'empty iterable'
+        // use case)
+        useCache = true;
+      }
+    }
+
+    returnElement = cache[cacheIndex];
+    cacheIndex = (cacheIndex + 1) % cache.length;
+
+    return returnElement;
+  };
+
+  return iter;
+};
+
+
+/**
+ * Creates an iterator that counts indefinitely from a starting value.
+ * @see http://docs.python.org/2/library/itertools.html#itertools.count
+ * @param {number=} opt_start The starting value. Default is 0.
+ * @param {number=} opt_step The number to increment with between each call to
+ *     next. Negative and floating point numbers are allowed. Default is 1.
+ * @return {!goog.iter.Iterator<number>} A new iterator that returns the values
+ *     in the series.
+ */
+goog.iter.count = function(opt_start, opt_step) {
+  var counter = opt_start || 0;
+  var step = goog.isDef(opt_step) ? opt_step : 1;
+  var iter = new goog.iter.Iterator();
+
+  iter.next = function() {
+    var returnValue = counter;
+    counter += step;
+    return returnValue;
+  };
+
+  return iter;
+};
+
+
+/**
+ * Creates an iterator that returns the same object or value repeatedly.
+ * @param {VALUE} value Any object or value to repeat.
+ * @return {!goog.iter.Iterator<VALUE>} A new iterator that returns the
+ *     repeated value.
+ * @template VALUE
+ */
+goog.iter.repeat = function(value) {
+  var iter = new goog.iter.Iterator();
+
+  iter.next = goog.functions.constant(value);
+
+  return iter;
+};
+
+
+/**
+ * Creates an iterator that returns running totals from the numbers in
+ * {@code iterable}. For example, the array {@code [1, 2, 3, 4, 5]} yields
+ * {@code 1 -> 3 -> 6 -> 10 -> 15}.
+ * @see http://docs.python.org/3.2/library/itertools.html#itertools.accumulate
+ * @param {!goog.iter.Iterable<number>} iterable The iterable of numbers to
+ *     accumulate.
+ * @return {!goog.iter.Iterator<number>} A new iterator that returns the
+ *     numbers in the series.
+ */
+goog.iter.accumulate = function(iterable) {
+  var iterator = goog.iter.toIterator(iterable);
+  var total = 0;
+  var iter = new goog.iter.Iterator();
+
+  iter.next = function() {
+    total += iterator.next();
+    return total;
+  };
+
+  return iter;
+};
+
+
+/**
+ * Creates an iterator that returns arrays containing the ith elements from the
+ * provided iterables. The returned arrays will be the same size as the number
+ * of iterables given in {@code var_args}. Once the shortest iterable is
+ * exhausted, subsequent calls to {@code next()} will throw
+ * {@code goog.iter.StopIteration}.
+ * @see http://docs.python.org/2/library/itertools.html#itertools.izip
+ * @param {...!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} var_args Any
+ *     number of iterable objects.
+ * @return {!goog.iter.Iterator<!Array<VALUE>>} A new iterator that returns
+ *     arrays of elements from the provided iterables.
+ * @template VALUE
+ */
+goog.iter.zip = function(var_args) {
+  var args = arguments;
+  var iter = new goog.iter.Iterator();
+
+  if (args.length > 0) {
+    var iterators = goog.array.map(args, goog.iter.toIterator);
+    iter.next = function() {
+      var arr = goog.array.map(iterators, function(it) {
+        return it.next();
+      });
+      return arr;
+    };
+  }
+
+  return iter;
+};
+
+
+/**
+ * Creates an iterator that returns arrays containing the ith elements from the
+ * provided iterables. The returned arrays will be the same size as the number
+ * of iterables given in {@code var_args}. Shorter iterables will be extended
+ * with {@code fillValue}. Once the longest iterable is exhausted, subsequent
+ * calls to {@code next()} will throw {@code goog.iter.StopIteration}.
+ * @see http://docs.python.org/2/library/itertools.html#itertools.izip_longest
+ * @param {VALUE} fillValue The object or value used to fill shorter iterables.
+ * @param {...!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} var_args Any
+ *     number of iterable objects.
+ * @return {!goog.iter.Iterator<!Array<VALUE>>} A new iterator that returns
+ *     arrays of elements from the provided iterables.
+ * @template VALUE
+ */
+goog.iter.zipLongest = function(fillValue, var_args) {
+  var args = goog.array.slice(arguments, 1);
+  var iter = new goog.iter.Iterator();
+
+  if (args.length > 0) {
+    var iterators = goog.array.map(args, goog.iter.toIterator);
+
+    iter.next = function() {
+      var iteratorsHaveValues = false;  // false when all iterators are empty.
+      var arr = goog.array.map(iterators, function(it) {
+        var returnValue;
+        try {
+          returnValue = it.next();
+          // Iterator had a value, so we've not exhausted the iterators.
+          // Set flag accordingly.
+          iteratorsHaveValues = true;
+        } catch (ex) {
+          if (ex !== goog.iter.StopIteration) {
+            throw ex;
+          }
+          returnValue = fillValue;
+        }
+        return returnValue;
+      });
+
+      if (!iteratorsHaveValues) {
+        throw goog.iter.StopIteration;
+      }
+      return arr;
+    };
+  }
+
+  return iter;
+};
+
+
+/**
+ * Creates an iterator that filters {@code iterable} based on a series of
+ * {@code selectors}. On each call to {@code next()}, one item is taken from
+ * both the {@code iterable} and {@code selectors} iterators. If the item from
+ * {@code selectors} evaluates to true, the item from {@code iterable} is given.
+ * Otherwise, it is skipped. Once either {@code iterable} or {@code selectors}
+ * is exhausted, subsequent calls to {@code next()} will throw
+ * {@code goog.iter.StopIteration}.
+ * @see http://docs.python.org/2/library/itertools.html#itertools.compress
+ * @param {!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} iterable The
+ *     iterable to filter.
+ * @param {!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} selectors An
+ *     iterable of items to be evaluated in a boolean context to determine if
+ *     the corresponding element in {@code iterable} should be included in the
+ *     result.
+ * @return {!goog.iter.Iterator<VALUE>} A new iterator that returns the
+ *     filtered values.
+ * @template VALUE
+ */
+goog.iter.compress = function(iterable, selectors) {
+  var selectorIterator = goog.iter.toIterator(selectors);
+
+  return goog.iter.filter(iterable, function() {
+    return !!selectorIterator.next();
+  });
+};
+
+
+
+/**
+ * Implements the {@code goog.iter.groupBy} iterator.
+ * @param {!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} iterable The
+ *     iterable to group.
+ * @param {function(...VALUE): KEY=} opt_keyFunc  Optional function for
+ *     determining the key value for each group in the {@code iterable}. Default
+ *     is the identity function.
+ * @constructor
+ * @extends {goog.iter.Iterator<!Array<?>>}
+ * @template KEY, VALUE
+ * @private
+ */
+goog.iter.GroupByIterator_ = function(iterable, opt_keyFunc) {
+
+  /**
+   * The iterable to group, coerced to an iterator.
+   * @type {!goog.iter.Iterator}
+   */
+  this.iterator = goog.iter.toIterator(iterable);
+
+  /**
+   * A function for determining the key value for each element in the iterable.
+   * If no function is provided, the identity function is used and returns the
+   * element unchanged.
+   * @type {function(...VALUE): KEY}
+   */
+  this.keyFunc = opt_keyFunc || goog.functions.identity;
+
+  /**
+   * The target key for determining the start of a group.
+   * @type {KEY}
+   */
+  this.targetKey;
+
+  /**
+   * The current key visited during iteration.
+   * @type {KEY}
+   */
+  this.currentKey;
+
+  /**
+   * The current value being added to the group.
+   * @type {VALUE}
+   */
+  this.currentValue;
+};
+goog.inherits(goog.iter.GroupByIterator_, goog.iter.Iterator);
+
+
+/** @override */
+goog.iter.GroupByIterator_.prototype.next = function() {
+  while (this.currentKey == this.targetKey) {
+    this.currentValue = this.iterator.next();  // Exits on StopIteration
+    this.currentKey = this.keyFunc(this.currentValue);
+  }
+  this.targetKey = this.currentKey;
+  return [this.currentKey, this.groupItems_(this.targetKey)];
+};
+
+
+/**
+ * Performs the grouping of objects using the given key.
+ * @param {KEY} targetKey  The target key object for the group.
+ * @return {!Array<VALUE>} An array of grouped objects.
+ * @private
+ */
+goog.iter.GroupByIterator_.prototype.groupItems_ = function(targetKey) {
+  var arr = [];
+  while (this.currentKey == targetKey) {
+    arr.push(this.currentValue);
+    try {
+      this.currentValue = this.iterator.next();
+    } catch (ex) {
+      if (ex !== goog.iter.StopIteration) {
+        throw ex;
+      }
+      break;
+    }
+    this.currentKey = this.keyFunc(this.currentValue);
+  }
+  return arr;
+};
+
+
+/**
+ * Creates an iterator that returns arrays containing elements from the
+ * {@code iterable} grouped by a key value. For iterables with repeated
+ * elements (i.e. sorted according to a particular key function), this function
+ * has a {@code uniq}-like effect. For example, grouping the array:
+ * {@code [A, B, B, C, C, A]} produces
+ * {@code [A, [A]], [B, [B, B]], [C, [C, C]], [A, [A]]}.
+ * @see http://docs.python.org/2/library/itertools.html#itertools.groupby
+ * @param {!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} iterable The
+ *     iterable to group.
+ * @param {function(...VALUE): KEY=} opt_keyFunc  Optional function for
+ *     determining the key value for each group in the {@code iterable}. Default
+ *     is the identity function.
+ * @return {!goog.iter.Iterator<!Array<?>>} A new iterator that returns
+ *     arrays of consecutive key and groups.
+ * @template KEY, VALUE
+ */
+goog.iter.groupBy = function(iterable, opt_keyFunc) {
+  return new goog.iter.GroupByIterator_(iterable, opt_keyFunc);
+};
+
+
+/**
+ * Gives an iterator that gives the result of calling the given function
+ * <code>f</code> with the arguments taken from the next element from
+ * <code>iterable</code> (the elements are expected to also be iterables).
+ *
+ * Similar to {@see goog.iter#map} but allows the function to accept multiple
+ * arguments from the iterable.
+ *
+ * @param {!goog.iter.Iterable<!goog.iter.Iterable>} iterable The iterable of
+ *     iterables to iterate over.
+ * @param {function(this:THIS,...*):RESULT} f The function to call for every
+ *     element.  This function takes N+2 arguments, where N represents the
+ *     number of items from the next element of the iterable. The two
+ *     additional arguments passed to the function are undefined and the
+ *     iterator itself. The function should return a new value.
+ * @param {THIS=} opt_obj The object to be used as the value of 'this' within
+ *     {@code f}.
+ * @return {!goog.iter.Iterator<RESULT>} A new iterator that returns the
+ *     results of applying the function to each element in the original
+ *     iterator.
+ * @template THIS, RESULT
+ */
+goog.iter.starMap = function(iterable, f, opt_obj) {
+  var iterator = goog.iter.toIterator(iterable);
+  var iter = new goog.iter.Iterator();
+
+  iter.next = function() {
+    var args = goog.iter.toArray(iterator.next());
+    return f.apply(opt_obj, goog.array.concat(args, undefined, iterator));
+  };
+
+  return iter;
+};
+
+
+/**
+ * Returns an array of iterators each of which can iterate over the values in
+ * {@code iterable} without advancing the others.
+ * @see http://docs.python.org/2/library/itertools.html#itertools.tee
+ * @param {!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} iterable The
+ *     iterable to tee.
+ * @param {number=} opt_num  The number of iterators to create. Default is 2.
+ * @return {!Array<goog.iter.Iterator<VALUE>>} An array of iterators.
+ * @template VALUE
+ */
+goog.iter.tee = function(iterable, opt_num) {
+  var iterator = goog.iter.toIterator(iterable);
+  var num = goog.isNumber(opt_num) ? opt_num : 2;
+  var buffers = goog.array.map(goog.array.range(num), function() {
+    return [];
+  });
+
+  var addNextIteratorValueToBuffers = function() {
+    var val = iterator.next();
+    goog.array.forEach(buffers, function(buffer) {
+      buffer.push(val);
+    });
+  };
+
+  var createIterator = function(buffer) {
+    // Each tee'd iterator has an associated buffer (initially empty). When a
+    // tee'd iterator's buffer is empty, it calls
+    // addNextIteratorValueToBuffers(), adding the next value to all tee'd
+    // iterators' buffers, and then returns that value. This allows each
+    // iterator to be advanced independently.
+    var iter = new goog.iter.Iterator();
+
+    iter.next = function() {
+      if (goog.array.isEmpty(buffer)) {
+        addNextIteratorValueToBuffers();
+      }
+      goog.asserts.assert(!goog.array.isEmpty(buffer));
+      return buffer.shift();
+    };
+
+    return iter;
+  };
+
+  return goog.array.map(buffers, createIterator);
+};
+
+
+/**
+ * Creates an iterator that returns arrays containing a count and an element
+ * obtained from the given {@code iterable}.
+ * @see http://docs.python.org/2/library/functions.html#enumerate
+ * @param {!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} iterable The
+ *     iterable to enumerate.
+ * @param {number=} opt_start  Optional starting value. Default is 0.
+ * @return {!goog.iter.Iterator<!Array<?>>} A new iterator containing
+ *     count/item pairs.
+ * @template VALUE
+ */
+goog.iter.enumerate = function(iterable, opt_start) {
+  return goog.iter.zip(goog.iter.count(opt_start), iterable);
+};
+
+
+/**
+ * Creates an iterator that returns the first {@code limitSize} elements from an
+ * iterable. If this number is greater than the number of elements in the
+ * iterable, all the elements are returned.
+ * @see http://goo.gl/V0sihp Inspired by the limit iterator in Guava.
+ * @param {!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} iterable The
+ *     iterable to limit.
+ * @param {number} limitSize  The maximum number of elements to return.
+ * @return {!goog.iter.Iterator<VALUE>} A new iterator containing
+ *     {@code limitSize} elements.
+ * @template VALUE
+ */
+goog.iter.limit = function(iterable, limitSize) {
+  goog.asserts.assert(goog.math.isInt(limitSize) && limitSize >= 0);
+
+  var iterator = goog.iter.toIterator(iterable);
+
+  var iter = new goog.iter.Iterator();
+  var remaining = limitSize;
+
+  iter.next = function() {
+    if (remaining-- > 0) {
+      return iterator.next();
+    }
+    throw goog.iter.StopIteration;
+  };
+
+  return iter;
+};
+
+
+/**
+ * Creates an iterator that is advanced {@code count} steps ahead. Consumed
+ * values are silently discarded. If {@code count} is greater than the number
+ * of elements in {@code iterable}, an empty iterator is returned. Subsequent
+ * calls to {@code next()} will throw {@code goog.iter.StopIteration}.
+ * @param {!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} iterable The
+ *     iterable to consume.
+ * @param {number} count  The number of elements to consume from the iterator.
+ * @return {!goog.iter.Iterator<VALUE>} An iterator advanced zero or more steps
+ *     ahead.
+ * @template VALUE
+ */
+goog.iter.consume = function(iterable, count) {
+  goog.asserts.assert(goog.math.isInt(count) && count >= 0);
+
+  var iterator = goog.iter.toIterator(iterable);
+
+  while (count-- > 0) {
+    goog.iter.nextOrValue(iterator, null);
+  }
+
+  return iterator;
+};
+
+
+/**
+ * Creates an iterator that returns a range of elements from an iterable.
+ * Similar to {@see goog.array#slice} but does not support negative indexes.
+ * @param {!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} iterable The
+ *     iterable to slice.
+ * @param {number} start  The index of the first element to return.
+ * @param {number=} opt_end  The index after the last element to return. If
+ *     defined, must be greater than or equal to {@code start}.
+ * @return {!goog.iter.Iterator<VALUE>} A new iterator containing a slice of
+ *     the original.
+ * @template VALUE
+ */
+goog.iter.slice = function(iterable, start, opt_end) {
+  goog.asserts.assert(goog.math.isInt(start) && start >= 0);
+
+  var iterator = goog.iter.consume(iterable, start);
+
+  if (goog.isNumber(opt_end)) {
+    goog.asserts.assert(goog.math.isInt(opt_end) && opt_end >= start);
+    iterator = goog.iter.limit(iterator, opt_end - start /* limitSize */);
+  }
+
+  return iterator;
+};
+
+
+/**
+ * Checks an array for duplicate elements.
+ * @param {Array<VALUE>|goog.array.ArrayLike} arr The array to check for
+ *     duplicates.
+ * @return {boolean} True, if the array contains duplicates, false otherwise.
+ * @private
+ * @template VALUE
+ */
+// TODO(user): Consider moving this into goog.array as a public function.
+goog.iter.hasDuplicates_ = function(arr) {
+  var deduped = [];
+  goog.array.removeDuplicates(arr, deduped);
+  return arr.length != deduped.length;
+};
+
+
+/**
+ * Creates an iterator that returns permutations of elements in
+ * {@code iterable}.
+ *
+ * Permutations are obtained by taking the Cartesian product of
+ * {@code opt_length} iterables and filtering out those with repeated
+ * elements. For example, the permutations of {@code [1,2,3]} are
+ * {@code [[1,2,3], [1,3,2], [2,1,3], [2,3,1], [3,1,2], [3,2,1]]}.
+ * @see http://docs.python.org/2/library/itertools.html#itertools.permutations
+ * @param {!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} iterable The
+ *     iterable from which to generate permutations.
+ * @param {number=} opt_length Length of each permutation. If omitted, defaults
+ *     to the length of {@code iterable}.
+ * @return {!goog.iter.Iterator<!Array<VALUE>>} A new iterator containing the
+ *     permutations of {@code iterable}.
+ * @template VALUE
+ */
+goog.iter.permutations = function(iterable, opt_length) {
+  var elements = goog.iter.toArray(iterable);
+  var length = goog.isNumber(opt_length) ? opt_length : elements.length;
+
+  var sets = goog.array.repeat(elements, length);
+  var product = goog.iter.product.apply(undefined, sets);
+
+  return goog.iter.filter(product, function(arr) {
+    return !goog.iter.hasDuplicates_(arr);
+  });
+};
+
+
+/**
+ * Creates an iterator that returns combinations of elements from
+ * {@code iterable}.
+ *
+ * Combinations are obtained by taking the {@see goog.iter#permutations} of
+ * {@code iterable} and filtering those whose elements appear in the order they
+ * are encountered in {@code iterable}. For example, the 3-length combinations
+ * of {@code [0,1,2,3]} are {@code [[0,1,2], [0,1,3], [0,2,3], [1,2,3]]}.
+ * @see http://docs.python.org/2/library/itertools.html#itertools.combinations
+ * @param {!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} iterable The
+ *     iterable from which to generate combinations.
+ * @param {number} length The length of each combination.
+ * @return {!goog.iter.Iterator<!Array<VALUE>>} A new iterator containing
+ *     combinations from the {@code iterable}.
+ * @template VALUE
+ */
+goog.iter.combinations = function(iterable, length) {
+  var elements = goog.iter.toArray(iterable);
+  var indexes = goog.iter.range(elements.length);
+  var indexIterator = goog.iter.permutations(indexes, length);
+  // sortedIndexIterator will now give arrays of with the given length that
+  // indicate what indexes into "elements" should be returned on each iteration.
+  var sortedIndexIterator = goog.iter.filter(indexIterator, function(arr) {
+    return goog.array.isSorted(arr);
+  });
+
+  var iter = new goog.iter.Iterator();
+
+  function getIndexFromElements(index) {
+    return elements[index];
+  }
+
+  iter.next = function() {
+    return goog.array.map(sortedIndexIterator.next(), getIndexFromElements);
+  };
+
+  return iter;
+};
+
+
+/**
+ * Creates an iterator that returns combinations of elements from
+ * {@code iterable}, with repeated elements possible.
+ *
+ * Combinations are obtained by taking the Cartesian product of {@code length}
+ * iterables and filtering those whose elements appear in the order they are
+ * encountered in {@code iterable}. For example, the 2-length combinations of
+ * {@code [1,2,3]} are {@code [[1,1], [1,2], [1,3], [2,2], [2,3], [3,3]]}.
+ * @see http://docs.python.org/2/library/itertools.html#itertools.combinations_with_replacement
+ * @see http://en.wikipedia.org/wiki/Combination#Number_of_combinations_with_repetition
+ * @param {!goog.iter.Iterator<VALUE>|!goog.iter.Iterable} iterable The
+ *     iterable to combine.
+ * @param {number} length The length of each combination.
+ * @return {!goog.iter.Iterator<!Array<VALUE>>} A new iterator containing
+ *     combinations from the {@code iterable}.
+ * @template VALUE
+ */
+goog.iter.combinationsWithReplacement = function(iterable, length) {
+  var elements = goog.iter.toArray(iterable);
+  var indexes = goog.array.range(elements.length);
+  var sets = goog.array.repeat(indexes, length);
+  var indexIterator = goog.iter.product.apply(undefined, sets);
+  // sortedIndexIterator will now give arrays of with the given length that
+  // indicate what indexes into "elements" should be returned on each iteration.
+  var sortedIndexIterator = goog.iter.filter(indexIterator, function(arr) {
+    return goog.array.isSorted(arr);
+  });
+
+  var iter = new goog.iter.Iterator();
+
+  function getIndexFromElements(index) {
+    return elements[index];
+  }
+
+  iter.next = function() {
+    return goog.array.map(
+        /** @type {!Array<number>} */
+        (sortedIndexIterator.next()), getIndexFromElements);
+  };
+
+  return iter;
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Datastructure: Hash Map.
+ *
+ * @author arv@google.com (Erik Arvidsson)
+ *
+ * This file contains an implementation of a Map structure. It implements a lot
+ * of the methods used in goog.structs so those functions work on hashes. This
+ * is best suited for complex key types. For simple keys such as numbers and
+ * strings consider using the lighter-weight utilities in goog.object.
+ */
+
+
+goog.provide('goog.structs.Map');
+
+goog.require('goog.iter.Iterator');
+goog.require('goog.iter.StopIteration');
+goog.require('goog.object');
+
+
+
+/**
+ * Class for Hash Map datastructure.
+ * @param {*=} opt_map Map or Object to initialize the map with.
+ * @param {...*} var_args If 2 or more arguments are present then they
+ *     will be used as key-value pairs.
+ * @constructor
+ * @template K, V
+ */
+goog.structs.Map = function(opt_map, var_args) {
+
+  /**
+   * Underlying JS object used to implement the map.
+   * @private {!Object}
+   */
+  this.map_ = {};
+
+  /**
+   * An array of keys. This is necessary for two reasons:
+   *   1. Iterating the keys using for (var key in this.map_) allocates an
+   *      object for every key in IE which is really bad for IE6 GC perf.
+   *   2. Without a side data structure, we would need to escape all the keys
+   *      as that would be the only way we could tell during iteration if the
+   *      key was an internal key or a property of the object.
+   *
+   * This array can contain deleted keys so it's necessary to check the map
+   * as well to see if the key is still in the map (this doesn't require a
+   * memory allocation in IE).
+   * @private {!Array<string>}
+   */
+  this.keys_ = [];
+
+  /**
+   * The number of key value pairs in the map.
+   * @private {number}
+   */
+  this.count_ = 0;
+
+  /**
+   * Version used to detect changes while iterating.
+   * @private {number}
+   */
+  this.version_ = 0;
+
+  var argLength = arguments.length;
+
+  if (argLength > 1) {
+    if (argLength % 2) {
+      throw Error('Uneven number of arguments');
+    }
+    for (var i = 0; i < argLength; i += 2) {
+      this.set(arguments[i], arguments[i + 1]);
+    }
+  } else if (opt_map) {
+    this.addAll(/** @type {Object} */ (opt_map));
+  }
+};
+
+
+/**
+ * @return {number} The number of key-value pairs in the map.
+ */
+goog.structs.Map.prototype.getCount = function() {
+  return this.count_;
+};
+
+
+/**
+ * Returns the values of the map.
+ * @return {!Array<V>} The values in the map.
+ */
+goog.structs.Map.prototype.getValues = function() {
+  this.cleanupKeysArray_();
+
+  var rv = [];
+  for (var i = 0; i < this.keys_.length; i++) {
+    var key = this.keys_[i];
+    rv.push(this.map_[key]);
+  }
+  return rv;
+};
+
+
+/**
+ * Returns the keys of the map.
+ * @return {!Array<string>} Array of string values.
+ */
+goog.structs.Map.prototype.getKeys = function() {
+  this.cleanupKeysArray_();
+  return /** @type {!Array<string>} */ (this.keys_.concat());
+};
+
+
+/**
+ * Whether the map contains the given key.
+ * @param {*} key The key to check for.
+ * @return {boolean} Whether the map contains the key.
+ */
+goog.structs.Map.prototype.containsKey = function(key) {
+  return goog.structs.Map.hasKey_(this.map_, key);
+};
+
+
+/**
+ * Whether the map contains the given value. This is O(n).
+ * @param {V} val The value to check for.
+ * @return {boolean} Whether the map contains the value.
+ */
+goog.structs.Map.prototype.containsValue = function(val) {
+  for (var i = 0; i < this.keys_.length; i++) {
+    var key = this.keys_[i];
+    if (goog.structs.Map.hasKey_(this.map_, key) && this.map_[key] == val) {
+      return true;
+    }
+  }
+  return false;
+};
+
+
+/**
+ * Whether this map is equal to the argument map.
+ * @param {goog.structs.Map} otherMap The map against which to test equality.
+ * @param {function(V, V): boolean=} opt_equalityFn Optional equality function
+ *     to test equality of values. If not specified, this will test whether
+ *     the values contained in each map are identical objects.
+ * @return {boolean} Whether the maps are equal.
+ */
+goog.structs.Map.prototype.equals = function(otherMap, opt_equalityFn) {
+  if (this === otherMap) {
+    return true;
+  }
+
+  if (this.count_ != otherMap.getCount()) {
+    return false;
+  }
+
+  var equalityFn = opt_equalityFn || goog.structs.Map.defaultEquals;
+
+  this.cleanupKeysArray_();
+  for (var key, i = 0; key = this.keys_[i]; i++) {
+    if (!equalityFn(this.get(key), otherMap.get(key))) {
+      return false;
+    }
+  }
+
+  return true;
+};
+
+
+/**
+ * Default equality test for values.
+ * @param {*} a The first value.
+ * @param {*} b The second value.
+ * @return {boolean} Whether a and b reference the same object.
+ */
+goog.structs.Map.defaultEquals = function(a, b) {
+  return a === b;
+};
+
+
+/**
+ * @return {boolean} Whether the map is empty.
+ */
+goog.structs.Map.prototype.isEmpty = function() {
+  return this.count_ == 0;
+};
+
+
+/**
+ * Removes all key-value pairs from the map.
+ */
+goog.structs.Map.prototype.clear = function() {
+  this.map_ = {};
+  this.keys_.length = 0;
+  this.count_ = 0;
+  this.version_ = 0;
+};
+
+
+/**
+ * Removes a key-value pair based on the key. This is O(logN) amortized due to
+ * updating the keys array whenever the count becomes half the size of the keys
+ * in the keys array.
+ * @param {*} key  The key to remove.
+ * @return {boolean} Whether object was removed.
+ */
+goog.structs.Map.prototype.remove = function(key) {
+  if (goog.structs.Map.hasKey_(this.map_, key)) {
+    delete this.map_[key];
+    this.count_--;
+    this.version_++;
+
+    // clean up the keys array if the threshhold is hit
+    if (this.keys_.length > 2 * this.count_) {
+      this.cleanupKeysArray_();
+    }
+
+    return true;
+  }
+  return false;
+};
+
+
+/**
+ * Cleans up the temp keys array by removing entries that are no longer in the
+ * map.
+ * @private
+ */
+goog.structs.Map.prototype.cleanupKeysArray_ = function() {
+  if (this.count_ != this.keys_.length) {
+    // First remove keys that are no longer in the map.
+    var srcIndex = 0;
+    var destIndex = 0;
+    while (srcIndex < this.keys_.length) {
+      var key = this.keys_[srcIndex];
+      if (goog.structs.Map.hasKey_(this.map_, key)) {
+        this.keys_[destIndex++] = key;
+      }
+      srcIndex++;
+    }
+    this.keys_.length = destIndex;
+  }
+
+  if (this.count_ != this.keys_.length) {
+    // If the count still isn't correct, that means we have duplicates. This can
+    // happen when the same key is added and removed multiple times. Now we have
+    // to allocate one extra Object to remove the duplicates. This could have
+    // been done in the first pass, but in the common case, we can avoid
+    // allocating an extra object by only doing this when necessary.
+    var seen = {};
+    var srcIndex = 0;
+    var destIndex = 0;
+    while (srcIndex < this.keys_.length) {
+      var key = this.keys_[srcIndex];
+      if (!(goog.structs.Map.hasKey_(seen, key))) {
+        this.keys_[destIndex++] = key;
+        seen[key] = 1;
+      }
+      srcIndex++;
+    }
+    this.keys_.length = destIndex;
+  }
+};
+
+
+/**
+ * Returns the value for the given key.  If the key is not found and the default
+ * value is not given this will return {@code undefined}.
+ * @param {*} key The key to get the value for.
+ * @param {DEFAULT=} opt_val The value to return if no item is found for the
+ *     given key, defaults to undefined.
+ * @return {V|DEFAULT} The value for the given key.
+ * @template DEFAULT
+ */
+goog.structs.Map.prototype.get = function(key, opt_val) {
+  if (goog.structs.Map.hasKey_(this.map_, key)) {
+    return this.map_[key];
+  }
+  return opt_val;
+};
+
+
+/**
+ * Adds a key-value pair to the map.
+ * @param {*} key The key.
+ * @param {V} value The value to add.
+ * @return {*} Some subclasses return a value.
+ */
+goog.structs.Map.prototype.set = function(key, value) {
+  if (!(goog.structs.Map.hasKey_(this.map_, key))) {
+    this.count_++;
+    this.keys_.push(key);
+    // Only change the version if we add a new key.
+    this.version_++;
+  }
+  this.map_[key] = value;
+};
+
+
+/**
+ * Adds multiple key-value pairs from another goog.structs.Map or Object.
+ * @param {Object} map  Object containing the data to add.
+ */
+goog.structs.Map.prototype.addAll = function(map) {
+  var keys, values;
+  if (map instanceof goog.structs.Map) {
+    keys = map.getKeys();
+    values = map.getValues();
+  } else {
+    keys = goog.object.getKeys(map);
+    values = goog.object.getValues(map);
+  }
+  // we could use goog.array.forEach here but I don't want to introduce that
+  // dependency just for this.
+  for (var i = 0; i < keys.length; i++) {
+    this.set(keys[i], values[i]);
+  }
+};
+
+
+/**
+ * Calls the given function on each entry in the map.
+ * @param {function(this:T, V, K, goog.structs.Map<K,V>)} f
+ * @param {T=} opt_obj The value of "this" inside f.
+ * @template T
+ */
+goog.structs.Map.prototype.forEach = function(f, opt_obj) {
+  var keys = this.getKeys();
+  for (var i = 0; i < keys.length; i++) {
+    var key = keys[i];
+    var value = this.get(key);
+    f.call(opt_obj, value, key, this);
+  }
+};
+
+
+/**
+ * Clones a map and returns a new map.
+ * @return {!goog.structs.Map} A new map with the same key-value pairs.
+ */
+goog.structs.Map.prototype.clone = function() {
+  return new goog.structs.Map(this);
+};
+
+
+/**
+ * Returns a new map in which all the keys and values are interchanged
+ * (keys become values and values become keys). If multiple keys map to the
+ * same value, the chosen transposed value is implementation-dependent.
+ *
+ * It acts very similarly to {goog.object.transpose(Object)}.
+ *
+ * @return {!goog.structs.Map} The transposed map.
+ */
+goog.structs.Map.prototype.transpose = function() {
+  var transposed = new goog.structs.Map();
+  for (var i = 0; i < this.keys_.length; i++) {
+    var key = this.keys_[i];
+    var value = this.map_[key];
+    transposed.set(value, key);
+  }
+
+  return transposed;
+};
+
+
+/**
+ * @return {!Object} Object representation of the map.
+ */
+goog.structs.Map.prototype.toObject = function() {
+  this.cleanupKeysArray_();
+  var obj = {};
+  for (var i = 0; i < this.keys_.length; i++) {
+    var key = this.keys_[i];
+    obj[key] = this.map_[key];
+  }
+  return obj;
+};
+
+
+/**
+ * Returns an iterator that iterates over the keys in the map.  Removal of keys
+ * while iterating might have undesired side effects.
+ * @return {!goog.iter.Iterator} An iterator over the keys in the map.
+ */
+goog.structs.Map.prototype.getKeyIterator = function() {
+  return this.__iterator__(true);
+};
+
+
+/**
+ * Returns an iterator that iterates over the values in the map.  Removal of
+ * keys while iterating might have undesired side effects.
+ * @return {!goog.iter.Iterator} An iterator over the values in the map.
+ */
+goog.structs.Map.prototype.getValueIterator = function() {
+  return this.__iterator__(false);
+};
+
+
+/**
+ * Returns an iterator that iterates over the values or the keys in the map.
+ * This throws an exception if the map was mutated since the iterator was
+ * created.
+ * @param {boolean=} opt_keys True to iterate over the keys. False to iterate
+ *     over the values.  The default value is false.
+ * @return {!goog.iter.Iterator} An iterator over the values or keys in the map.
+ */
+goog.structs.Map.prototype.__iterator__ = function(opt_keys) {
+  // Clean up keys to minimize the risk of iterating over dead keys.
+  this.cleanupKeysArray_();
+
+  var i = 0;
+  var version = this.version_;
+  var selfObj = this;
+
+  var newIter = new goog.iter.Iterator;
+  newIter.next = function() {
+    if (version != selfObj.version_) {
+      throw Error('The map has changed since the iterator was created');
+    }
+    if (i >= selfObj.keys_.length) {
+      throw goog.iter.StopIteration;
+    }
+    var key = selfObj.keys_[i++];
+    return opt_keys ? key : selfObj.map_[key];
+  };
+  return newIter;
+};
+
+
+/**
+ * Safe way to test for hasOwnProperty.  It even allows testing for
+ * 'hasOwnProperty'.
+ * @param {Object} obj The object to test for presence of the given key.
+ * @param {*} key The key to check for.
+ * @return {boolean} Whether the object has the key.
+ * @private
+ */
+goog.structs.Map.hasKey_ = function(obj, key) {
+  return Object.prototype.hasOwnProperty.call(obj, key);
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Datastructure: Set.
+ *
+ * @author arv@google.com (Erik Arvidsson)
+ *
+ * This class implements a set data structure. Adding and removing is O(1). It
+ * supports both object and primitive values. Be careful because you can add
+ * both 1 and new Number(1), because these are not the same. You can even add
+ * multiple new Number(1) because these are not equal.
+ */
+
+
+goog.provide('goog.structs.Set');
+
+goog.require('goog.structs');
+goog.require('goog.structs.Collection');
+goog.require('goog.structs.Map');
+
+
+
+/**
+ * A set that can contain both primitives and objects.  Adding and removing
+ * elements is O(1).  Primitives are treated as identical if they have the same
+ * type and convert to the same string.  Objects are treated as identical only
+ * if they are references to the same object.  WARNING: A goog.structs.Set can
+ * contain both 1 and (new Number(1)), because they are not the same.  WARNING:
+ * Adding (new Number(1)) twice will yield two distinct elements, because they
+ * are two different objects.  WARNING: Any object that is added to a
+ * goog.structs.Set will be modified!  Because goog.getUid() is used to
+ * identify objects, every object in the set will be mutated.
+ * @param {Array<T>|Object<?,T>=} opt_values Initial values to start with.
+ * @constructor
+ * @implements {goog.structs.Collection<T>}
+ * @final
+ * @template T
+ */
+goog.structs.Set = function(opt_values) {
+  this.map_ = new goog.structs.Map;
+  if (opt_values) {
+    this.addAll(opt_values);
+  }
+};
+
+
+/**
+ * Obtains a unique key for an element of the set.  Primitives will yield the
+ * same key if they have the same type and convert to the same string.  Object
+ * references will yield the same key only if they refer to the same object.
+ * @param {*} val Object or primitive value to get a key for.
+ * @return {string} A unique key for this value/object.
+ * @private
+ */
+goog.structs.Set.getKey_ = function(val) {
+  var type = typeof val;
+  if (type == 'object' && val || type == 'function') {
+    return 'o' + goog.getUid(/** @type {Object} */ (val));
+  } else {
+    return type.substr(0, 1) + val;
+  }
+};
+
+
+/**
+ * @return {number} The number of elements in the set.
+ * @override
+ */
+goog.structs.Set.prototype.getCount = function() {
+  return this.map_.getCount();
+};
+
+
+/**
+ * Add a primitive or an object to the set.
+ * @param {T} element The primitive or object to add.
+ * @override
+ */
+goog.structs.Set.prototype.add = function(element) {
+  this.map_.set(goog.structs.Set.getKey_(element), element);
+};
+
+
+/**
+ * Adds all the values in the given collection to this set.
+ * @param {Array<T>|goog.structs.Collection<T>|Object<?,T>} col A collection
+ *     containing the elements to add.
+ */
+goog.structs.Set.prototype.addAll = function(col) {
+  var values = goog.structs.getValues(col);
+  var l = values.length;
+  for (var i = 0; i < l; i++) {
+    this.add(values[i]);
+  }
+};
+
+
+/**
+ * Removes all values in the given collection from this set.
+ * @param {Array<T>|goog.structs.Collection<T>|Object<?,T>} col A collection
+ *     containing the elements to remove.
+ */
+goog.structs.Set.prototype.removeAll = function(col) {
+  var values = goog.structs.getValues(col);
+  var l = values.length;
+  for (var i = 0; i < l; i++) {
+    this.remove(values[i]);
+  }
+};
+
+
+/**
+ * Removes the given element from this set.
+ * @param {T} element The primitive or object to remove.
+ * @return {boolean} Whether the element was found and removed.
+ * @override
+ */
+goog.structs.Set.prototype.remove = function(element) {
+  return this.map_.remove(goog.structs.Set.getKey_(element));
+};
+
+
+/**
+ * Removes all elements from this set.
+ */
+goog.structs.Set.prototype.clear = function() {
+  this.map_.clear();
+};
+
+
+/**
+ * Tests whether this set is empty.
+ * @return {boolean} True if there are no elements in this set.
+ */
+goog.structs.Set.prototype.isEmpty = function() {
+  return this.map_.isEmpty();
+};
+
+
+/**
+ * Tests whether this set contains the given element.
+ * @param {T} element The primitive or object to test for.
+ * @return {boolean} True if this set contains the given element.
+ * @override
+ */
+goog.structs.Set.prototype.contains = function(element) {
+  return this.map_.containsKey(goog.structs.Set.getKey_(element));
+};
+
+
+/**
+ * Tests whether this set contains all the values in a given collection.
+ * Repeated elements in the collection are ignored, e.g.  (new
+ * goog.structs.Set([1, 2])).containsAll([1, 1]) is True.
+ * @param {goog.structs.Collection<T>|Object} col A collection-like object.
+ * @return {boolean} True if the set contains all elements.
+ */
+goog.structs.Set.prototype.containsAll = function(col) {
+  return goog.structs.every(col, this.contains, this);
+};
+
+
+/**
+ * Finds all values that are present in both this set and the given collection.
+ * @param {Array<S>|Object<?,S>} col A collection.
+ * @return {!goog.structs.Set<T|S>} A new set containing all the values
+ *     (primitives or objects) present in both this set and the given
+ *     collection.
+ * @template S
+ */
+goog.structs.Set.prototype.intersection = function(col) {
+  var result = new goog.structs.Set();
+
+  var values = goog.structs.getValues(col);
+  for (var i = 0; i < values.length; i++) {
+    var value = values[i];
+    if (this.contains(value)) {
+      result.add(value);
+    }
+  }
+
+  return result;
+};
+
+
+/**
+ * Finds all values that are present in this set and not in the given
+ * collection.
+ * @param {Array<T>|goog.structs.Collection<T>|Object<?,T>} col A collection.
+ * @return {!goog.structs.Set} A new set containing all the values
+ *     (primitives or objects) present in this set but not in the given
+ *     collection.
+ */
+goog.structs.Set.prototype.difference = function(col) {
+  var result = this.clone();
+  result.removeAll(col);
+  return result;
+};
+
+
+/**
+ * Returns an array containing all the elements in this set.
+ * @return {!Array<T>} An array containing all the elements in this set.
+ */
+goog.structs.Set.prototype.getValues = function() {
+  return this.map_.getValues();
+};
+
+
+/**
+ * Creates a shallow clone of this set.
+ * @return {!goog.structs.Set<T>} A new set containing all the same elements as
+ *     this set.
+ */
+goog.structs.Set.prototype.clone = function() {
+  return new goog.structs.Set(this);
+};
+
+
+/**
+ * Tests whether the given collection consists of the same elements as this set,
+ * regardless of order, without repetition.  Primitives are treated as equal if
+ * they have the same type and convert to the same string; objects are treated
+ * as equal if they are references to the same object.  This operation is O(n).
+ * @param {goog.structs.Collection<T>|Object} col A collection.
+ * @return {boolean} True if the given collection consists of the same elements
+ *     as this set, regardless of order, without repetition.
+ */
+goog.structs.Set.prototype.equals = function(col) {
+  return this.getCount() == goog.structs.getCount(col) && this.isSubsetOf(col);
+};
+
+
+/**
+ * Tests whether the given collection contains all the elements in this set.
+ * Primitives are treated as equal if they have the same type and convert to the
+ * same string; objects are treated as equal if they are references to the same
+ * object.  This operation is O(n).
+ * @param {goog.structs.Collection<T>|Object} col A collection.
+ * @return {boolean} True if this set is a subset of the given collection.
+ */
+goog.structs.Set.prototype.isSubsetOf = function(col) {
+  var colCount = goog.structs.getCount(col);
+  if (this.getCount() > colCount) {
+    return false;
+  }
+  // TODO(user) Find the minimal collection size where the conversion makes
+  // the contains() method faster.
+  if (!(col instanceof goog.structs.Set) && colCount > 5) {
+    // Convert to a goog.structs.Set so that goog.structs.contains runs in
+    // O(1) time instead of O(n) time.
+    col = new goog.structs.Set(col);
+  }
+  return goog.structs.every(this, function(value) {
+    return goog.structs.contains(col, value);
+  });
+};
+
+
+/**
+ * Returns an iterator that iterates over the elements in this set.
+ * @param {boolean=} opt_keys This argument is ignored.
+ * @return {!goog.iter.Iterator} An iterator over the elements in this set.
+ */
+goog.structs.Set.prototype.__iterator__ = function(opt_keys) {
+  return this.map_.__iterator__(false);
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Logging and debugging utilities.
+ *
+ * @see ../demos/debug.html
+ */
+
+goog.provide('goog.debug');
+
+goog.require('goog.array');
+goog.require('goog.html.SafeHtml');
+goog.require('goog.html.SafeUrl');
+goog.require('goog.html.uncheckedconversions');
+goog.require('goog.string.Const');
+goog.require('goog.structs.Set');
+goog.require('goog.userAgent');
+
+
+/** @define {boolean} Whether logging should be enabled. */
+goog.define('goog.debug.LOGGING_ENABLED', goog.DEBUG);
+
+
+/**
+ * Catches onerror events fired by windows and similar objects.
+ * @param {function(Object)} logFunc The function to call with the error
+ *    information.
+ * @param {boolean=} opt_cancel Whether to stop the error from reaching the
+ *    browser.
+ * @param {Object=} opt_target Object that fires onerror events.
+ */
+goog.debug.catchErrors = function(logFunc, opt_cancel, opt_target) {
+  var target = opt_target || goog.global;
+  var oldErrorHandler = target.onerror;
+  var retVal = !!opt_cancel;
+
+  // Chrome interprets onerror return value backwards (http://crbug.com/92062)
+  // until it was fixed in webkit revision r94061 (Webkit 535.3). This
+  // workaround still needs to be skipped in Safari after the webkit change
+  // gets pushed out in Safari.
+  // See https://bugs.webkit.org/show_bug.cgi?id=67119
+  if (goog.userAgent.WEBKIT &&
+      !goog.userAgent.isVersionOrHigher('535.3')) {
+    retVal = !retVal;
+  }
+
+  /**
+   * New onerror handler for this target. This onerror handler follows the spec
+   * according to
+   * http://www.whatwg.org/specs/web-apps/current-work/#runtime-script-errors
+   * The spec was changed in August 2013 to support receiving column information
+   * and an error object for all scripts on the same origin or cross origin
+   * scripts with the proper headers. See
+   * https://mikewest.org/2013/08/debugging-runtime-errors-with-window-onerror
+   *
+   * @param {string} message The error message. For cross-origin errors, this
+   *     will be scrubbed to just "Script error.". For new browsers that have
+   *     updated to follow the latest spec, errors that come from origins that
+   *     have proper cross origin headers will not be scrubbed.
+   * @param {string} url The URL of the script that caused the error. The URL
+   *     will be scrubbed to "" for cross origin scripts unless the script has
+   *     proper cross origin headers and the browser has updated to the latest
+   *     spec.
+   * @param {number} line The line number in the script that the error
+   *     occurred on.
+   * @param {number=} opt_col The optional column number that the error
+   *     occurred on. Only browsers that have updated to the latest spec will
+   *     include this.
+   * @param {Error=} opt_error The optional actual error object for this
+   *     error that should include the stack. Only browsers that have updated
+   *     to the latest spec will inlude this parameter.
+   * @return {boolean} Whether to prevent the error from reaching the browser.
+   */
+  target.onerror = function(message, url, line, opt_col, opt_error) {
+    if (oldErrorHandler) {
+      oldErrorHandler(message, url, line, opt_col, opt_error);
+    }
+    logFunc({
+      message: message,
+      fileName: url,
+      line: line,
+      col: opt_col,
+      error: opt_error
+    });
+    return retVal;
+  };
+};
+
+
+/**
+ * Creates a string representing an object and all its properties.
+ * @param {Object|null|undefined} obj Object to expose.
+ * @param {boolean=} opt_showFn Show the functions as well as the properties,
+ *     default is false.
+ * @return {string} The string representation of {@code obj}.
+ */
+goog.debug.expose = function(obj, opt_showFn) {
+  if (typeof obj == 'undefined') {
+    return 'undefined';
+  }
+  if (obj == null) {
+    return 'NULL';
+  }
+  var str = [];
+
+  for (var x in obj) {
+    if (!opt_showFn && goog.isFunction(obj[x])) {
+      continue;
+    }
+    var s = x + ' = ';
+    /** @preserveTry */
+    try {
+      s += obj[x];
+    } catch (e) {
+      s += '*** ' + e + ' ***';
+    }
+    str.push(s);
+  }
+  return str.join('\n');
+};
+
+
+/**
+ * Creates a string representing a given primitive or object, and for an
+ * object, all its properties and nested objects.  WARNING: If an object is
+ * given, it and all its nested objects will be modified.  To detect reference
+ * cycles, this method identifies objects using goog.getUid() which mutates the
+ * object.
+ * @param {*} obj Object to expose.
+ * @param {boolean=} opt_showFn Also show properties that are functions (by
+ *     default, functions are omitted).
+ * @return {string} A string representation of {@code obj}.
+ */
+goog.debug.deepExpose = function(obj, opt_showFn) {
+  var str = [];
+
+  var helper = function(obj, space, parentSeen) {
+    var nestspace = space + '  ';
+    var seen = new goog.structs.Set(parentSeen);
+
+    var indentMultiline = function(str) {
+      return str.replace(/\n/g, '\n' + space);
+    };
+
+    /** @preserveTry */
+    try {
+      if (!goog.isDef(obj)) {
+        str.push('undefined');
+      } else if (goog.isNull(obj)) {
+        str.push('NULL');
+      } else if (goog.isString(obj)) {
+        str.push('"' + indentMultiline(obj) + '"');
+      } else if (goog.isFunction(obj)) {
+        str.push(indentMultiline(String(obj)));
+      } else if (goog.isObject(obj)) {
+        if (seen.contains(obj)) {
+          str.push('*** reference loop detected ***');
+        } else {
+          seen.add(obj);
+          str.push('{');
+          for (var x in obj) {
+            if (!opt_showFn && goog.isFunction(obj[x])) {
+              continue;
+            }
+            str.push('\n');
+            str.push(nestspace);
+            str.push(x + ' = ');
+            helper(obj[x], nestspace, seen);
+          }
+          str.push('\n' + space + '}');
+        }
+      } else {
+        str.push(obj);
+      }
+    } catch (e) {
+      str.push('*** ' + e + ' ***');
+    }
+  };
+
+  helper(obj, '', new goog.structs.Set());
+  return str.join('');
+};
+
+
+/**
+ * Recursively outputs a nested array as a string.
+ * @param {Array<?>} arr The array.
+ * @return {string} String representing nested array.
+ */
+goog.debug.exposeArray = function(arr) {
+  var str = [];
+  for (var i = 0; i < arr.length; i++) {
+    if (goog.isArray(arr[i])) {
+      str.push(goog.debug.exposeArray(arr[i]));
+    } else {
+      str.push(arr[i]);
+    }
+  }
+  return '[ ' + str.join(', ') + ' ]';
+};
+
+
+/**
+ * Exposes an exception that has been caught by a try...catch and outputs the
+ * error as HTML with a stack trace.
+ * @param {Object} err Error object or string.
+ * @param {Function=} opt_fn Optional function to start stack trace from.
+ * @return {string} Details of exception, as HTML.
+ */
+goog.debug.exposeException = function(err, opt_fn) {
+  var html = goog.debug.exposeExceptionAsHtml(err, opt_fn);
+  return goog.html.SafeHtml.unwrap(html);
+};
+
+
+/**
+ * Exposes an exception that has been caught by a try...catch and outputs the
+ * error with a stack trace.
+ * @param {Object} err Error object or string.
+ * @param {Function=} opt_fn Optional function to start stack trace from.
+ * @return {!goog.html.SafeHtml} Details of exception.
+ */
+goog.debug.exposeExceptionAsHtml = function(err, opt_fn) {
+  /** @preserveTry */
+  try {
+    var e = goog.debug.normalizeErrorObject(err);
+    // Create the error message
+    var viewSourceUrl = goog.debug.createViewSourceUrl_(e.fileName);
+    var error = goog.html.SafeHtml.concat(
+        goog.html.SafeHtml.htmlEscapePreservingNewlinesAndSpaces(
+            'Message: ' + e.message + '\nUrl: '),
+        goog.html.SafeHtml.create('a',
+            {href: viewSourceUrl, target: '_new'}, e.fileName),
+        goog.html.SafeHtml.htmlEscapePreservingNewlinesAndSpaces(
+            '\nLine: ' + e.lineNumber + '\n\nBrowser stack:\n' +
+            e.stack + '-> ' + '[end]\n\nJS stack traversal:\n' +
+            goog.debug.getStacktrace(opt_fn) + '-> '));
+    return error;
+  } catch (e2) {
+    return goog.html.SafeHtml.htmlEscapePreservingNewlinesAndSpaces(
+        'Exception trying to expose exception! You win, we lose. ' + e2);
+  }
+};
+
+
+/**
+ * @param {?string=} opt_fileName
+ * @return {!goog.html.SafeUrl} SafeUrl with view-source scheme, pointing at
+ *     fileName.
+ * @private
+ */
+goog.debug.createViewSourceUrl_ = function(opt_fileName) {
+  if (!goog.isDefAndNotNull(opt_fileName)) {
+    opt_fileName = '';
+  }
+  if (!/^https?:\/\//i.test(opt_fileName)) {
+    return goog.html.SafeUrl.fromConstant(
+        goog.string.Const.from('sanitizedviewsrc'));
+  }
+  var sanitizedFileName = goog.html.SafeUrl.sanitize(opt_fileName);
+  return goog.html.uncheckedconversions.
+      safeUrlFromStringKnownToSatisfyTypeContract(
+          goog.string.Const.from('view-source scheme plus HTTP/HTTPS URL'),
+          'view-source:' + goog.html.SafeUrl.unwrap(sanitizedFileName));
+};
+
+
+/**
+ * Normalizes the error/exception object between browsers.
+ * @param {Object} err Raw error object.
+ * @return {!Object} Normalized error object.
+ */
+goog.debug.normalizeErrorObject = function(err) {
+  var href = goog.getObjectByName('window.location.href');
+  if (goog.isString(err)) {
+    return {
+      'message': err,
+      'name': 'Unknown error',
+      'lineNumber': 'Not available',
+      'fileName': href,
+      'stack': 'Not available'
+    };
+  }
+
+  var lineNumber, fileName;
+  var threwError = false;
+
+  try {
+    lineNumber = err.lineNumber || err.line || 'Not available';
+  } catch (e) {
+    // Firefox 2 sometimes throws an error when accessing 'lineNumber':
+    // Message: Permission denied to get property UnnamedClass.lineNumber
+    lineNumber = 'Not available';
+    threwError = true;
+  }
+
+  try {
+    fileName = err.fileName || err.filename || err.sourceURL ||
+        // $googDebugFname may be set before a call to eval to set the filename
+        // that the eval is supposed to present.
+        goog.global['$googDebugFname'] || href;
+  } catch (e) {
+    // Firefox 2 may also throw an error when accessing 'filename'.
+    fileName = 'Not available';
+    threwError = true;
+  }
+
+  // The IE Error object contains only the name and the message.
+  // The Safari Error object uses the line and sourceURL fields.
+  if (threwError || !err.lineNumber || !err.fileName || !err.stack ||
+      !err.message || !err.name) {
+    return {
+      'message': err.message || 'Not available',
+      'name': err.name || 'UnknownError',
+      'lineNumber': lineNumber,
+      'fileName': fileName,
+      'stack': err.stack || 'Not available'
+    };
+  }
+
+  // Standards error object
+  return err;
+};
+
+
+/**
+ * Converts an object to an Error if it's a String,
+ * adds a stacktrace if there isn't one,
+ * and optionally adds an extra message.
+ * @param {Error|string} err  the original thrown object or string.
+ * @param {string=} opt_message  optional additional message to add to the
+ *     error.
+ * @return {!Error} If err is a string, it is used to create a new Error,
+ *     which is enhanced and returned.  Otherwise err itself is enhanced
+ *     and returned.
+ */
+goog.debug.enhanceError = function(err, opt_message) {
+  var error;
+  if (typeof err == 'string') {
+    error = Error(err);
+    if (Error.captureStackTrace) {
+      // Trim this function off the call stack, if we can.
+      Error.captureStackTrace(error, goog.debug.enhanceError);
+    }
+  } else {
+    error = err;
+  }
+
+  if (!error.stack) {
+    error.stack = goog.debug.getStacktrace(goog.debug.enhanceError);
+  }
+  if (opt_message) {
+    // find the first unoccupied 'messageX' property
+    var x = 0;
+    while (error['message' + x]) {
+      ++x;
+    }
+    error['message' + x] = String(opt_message);
+  }
+  return error;
+};
+
+
+/**
+ * Gets the current stack trace. Simple and iterative - doesn't worry about
+ * catching circular references or getting the args.
+ * @param {number=} opt_depth Optional maximum depth to trace back to.
+ * @return {string} A string with the function names of all functions in the
+ *     stack, separated by \n.
+ * @suppress {es5Strict}
+ */
+goog.debug.getStacktraceSimple = function(opt_depth) {
+  if (goog.STRICT_MODE_COMPATIBLE) {
+    var stack = goog.debug.getNativeStackTrace_(goog.debug.getStacktraceSimple);
+    if (stack) {
+      return stack;
+    }
+    // NOTE: browsers that have strict mode support also have native "stack"
+    // properties.  Fall-through for legacy browser support.
+  }
+
+  var sb = [];
+  var fn = arguments.callee.caller;
+  var depth = 0;
+
+  while (fn && (!opt_depth || depth < opt_depth)) {
+    sb.push(goog.debug.getFunctionName(fn));
+    sb.push('()\n');
+    /** @preserveTry */
+    try {
+      fn = fn.caller;
+    } catch (e) {
+      sb.push('[exception trying to get caller]\n');
+      break;
+    }
+    depth++;
+    if (depth >= goog.debug.MAX_STACK_DEPTH) {
+      sb.push('[...long stack...]');
+      break;
+    }
+  }
+  if (opt_depth && depth >= opt_depth) {
+    sb.push('[...reached max depth limit...]');
+  } else {
+    sb.push('[end]');
+  }
+
+  return sb.join('');
+};
+
+
+/**
+ * Max length of stack to try and output
+ * @type {number}
+ */
+goog.debug.MAX_STACK_DEPTH = 50;
+
+
+/**
+ * @param {Function} fn The function to start getting the trace from.
+ * @return {?string}
+ * @private
+ */
+goog.debug.getNativeStackTrace_ = function(fn) {
+  var tempErr = new Error();
+  if (Error.captureStackTrace) {
+    Error.captureStackTrace(tempErr, fn);
+    return String(tempErr.stack);
+  } else {
+    // IE10, only adds stack traces when an exception is thrown.
+    try {
+      throw tempErr;
+    } catch (e) {
+      tempErr = e;
+    }
+    var stack = tempErr.stack;
+    if (stack) {
+      return String(stack);
+    }
+  }
+  return null;
+};
+
+
+/**
+ * Gets the current stack trace, either starting from the caller or starting
+ * from a specified function that's currently on the call stack.
+ * @param {Function=} opt_fn Optional function to start getting the trace from.
+ *     If not provided, defaults to the function that called this.
+ * @return {string} Stack trace.
+ * @suppress {es5Strict}
+ */
+goog.debug.getStacktrace = function(opt_fn) {
+  var stack;
+  if (goog.STRICT_MODE_COMPATIBLE) {
+    // Try to get the stack trace from the environment if it is available.
+    var contextFn = opt_fn || goog.debug.getStacktrace;
+    stack = goog.debug.getNativeStackTrace_(contextFn);
+  }
+  if (!stack) {
+    // NOTE: browsers that have strict mode support also have native "stack"
+    // properties. This function will throw in strict mode.
+    stack = goog.debug.getStacktraceHelper_(
+        opt_fn || arguments.callee.caller, []);
+  }
+  return stack;
+};
+
+
+/**
+ * Private helper for getStacktrace().
+ * @param {Function} fn Function to start getting the trace from.
+ * @param {Array<!Function>} visited List of functions visited so far.
+ * @return {string} Stack trace starting from function fn.
+ * @suppress {es5Strict}
+ * @private
+ */
+goog.debug.getStacktraceHelper_ = function(fn, visited) {
+  var sb = [];
+
+  // Circular reference, certain functions like bind seem to cause a recursive
+  // loop so we need to catch circular references
+  if (goog.array.contains(visited, fn)) {
+    sb.push('[...circular reference...]');
+
+  // Traverse the call stack until function not found or max depth is reached
+  } else if (fn && visited.length < goog.debug.MAX_STACK_DEPTH) {
+    sb.push(goog.debug.getFunctionName(fn) + '(');
+    var args = fn.arguments;
+    // Args may be null for some special functions such as host objects or eval.
+    for (var i = 0; args && i < args.length; i++) {
+      if (i > 0) {
+        sb.push(', ');
+      }
+      var argDesc;
+      var arg = args[i];
+      switch (typeof arg) {
+        case 'object':
+          argDesc = arg ? 'object' : 'null';
+          break;
+
+        case 'string':
+          argDesc = arg;
+          break;
+
+        case 'number':
+          argDesc = String(arg);
+          break;
+
+        case 'boolean':
+          argDesc = arg ? 'true' : 'false';
+          break;
+
+        case 'function':
+          argDesc = goog.debug.getFunctionName(arg);
+          argDesc = argDesc ? argDesc : '[fn]';
+          break;
+
+        case 'undefined':
+        default:
+          argDesc = typeof arg;
+          break;
+      }
+
+      if (argDesc.length > 40) {
+        argDesc = argDesc.substr(0, 40) + '...';
+      }
+      sb.push(argDesc);
+    }
+    visited.push(fn);
+    sb.push(')\n');
+    /** @preserveTry */
+    try {
+      sb.push(goog.debug.getStacktraceHelper_(fn.caller, visited));
+    } catch (e) {
+      sb.push('[exception trying to get caller]\n');
+    }
+
+  } else if (fn) {
+    sb.push('[...long stack...]');
+  } else {
+    sb.push('[end]');
+  }
+  return sb.join('');
+};
+
+
+/**
+ * Set a custom function name resolver.
+ * @param {function(Function): string} resolver Resolves functions to their
+ *     names.
+ */
+goog.debug.setFunctionResolver = function(resolver) {
+  goog.debug.fnNameResolver_ = resolver;
+};
+
+
+/**
+ * Gets a function name
+ * @param {Function} fn Function to get name of.
+ * @return {string} Function's name.
+ */
+goog.debug.getFunctionName = function(fn) {
+  if (goog.debug.fnNameCache_[fn]) {
+    return goog.debug.fnNameCache_[fn];
+  }
+  if (goog.debug.fnNameResolver_) {
+    var name = goog.debug.fnNameResolver_(fn);
+    if (name) {
+      goog.debug.fnNameCache_[fn] = name;
+      return name;
+    }
+  }
+
+  // Heuristically determine function name based on code.
+  var functionSource = String(fn);
+  if (!goog.debug.fnNameCache_[functionSource]) {
+    var matches = /function ([^\(]+)/.exec(functionSource);
+    if (matches) {
+      var method = matches[1];
+      goog.debug.fnNameCache_[functionSource] = method;
+    } else {
+      goog.debug.fnNameCache_[functionSource] = '[Anonymous]';
+    }
+  }
+
+  return goog.debug.fnNameCache_[functionSource];
+};
+
+
+/**
+ * Makes whitespace visible by replacing it with printable characters.
+ * This is useful in finding diffrences between the expected and the actual
+ * output strings of a testcase.
+ * @param {string} string whose whitespace needs to be made visible.
+ * @return {string} string whose whitespace is made visible.
+ */
+goog.debug.makeWhitespaceVisible = function(string) {
+  return string.replace(/ /g, '[_]')
+      .replace(/\f/g, '[f]')
+      .replace(/\n/g, '[n]\n')
+      .replace(/\r/g, '[r]')
+      .replace(/\t/g, '[t]');
+};
+
+
+/**
+ * Returns the type of a value. If a constructor is passed, and a suitable
+ * string cannot be found, 'unknown type name' will be returned.
+ *
+ * <p>Forked rather than moved from {@link goog.asserts.getType_}
+ * to avoid adding a dependency to goog.asserts.
+ * @param {*} value A constructor, object, or primitive.
+ * @return {string} The best display name for the value, or 'unknown type name'.
+ */
+goog.debug.runtimeType = function(value) {
+  if (value instanceof Function) {
+    return value.displayName || value.name || 'unknown type name';
+  } else if (value instanceof Object) {
+    return value.constructor.displayName || value.constructor.name ||
+        Object.prototype.toString.call(value);
+  } else {
+    return value === null ? 'null' : typeof value;
+  }
+};
+
+
+/**
+ * Hash map for storing function names that have already been looked up.
+ * @type {Object}
+ * @private
+ */
+goog.debug.fnNameCache_ = {};
+
+
+/**
+ * Resolves functions to their names.  Resolved function names will be cached.
+ * @type {function(Function):string}
+ * @private
+ */
+goog.debug.fnNameResolver_;
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Definition of the LogRecord class. Please minimize
+ * dependencies this file has on other closure classes as any dependency it
+ * takes won't be able to use the logging infrastructure.
+ *
+ */
+
+goog.provide('goog.debug.LogRecord');
+
+
+
+/**
+ * LogRecord objects are used to pass logging requests between
+ * the logging framework and individual log Handlers.
+ * @constructor
+ * @param {goog.debug.Logger.Level} level One of the level identifiers.
+ * @param {string} msg The string message.
+ * @param {string} loggerName The name of the source logger.
+ * @param {number=} opt_time Time this log record was created if other than now.
+ *     If 0, we use #goog.now.
+ * @param {number=} opt_sequenceNumber Sequence number of this log record. This
+ *     should only be passed in when restoring a log record from persistence.
+ */
+goog.debug.LogRecord = function(level, msg, loggerName,
+    opt_time, opt_sequenceNumber) {
+  this.reset(level, msg, loggerName, opt_time, opt_sequenceNumber);
+};
+
+
+/**
+ * Time the LogRecord was created.
+ * @type {number}
+ * @private
+ */
+goog.debug.LogRecord.prototype.time_;
+
+
+/**
+ * Level of the LogRecord
+ * @type {goog.debug.Logger.Level}
+ * @private
+ */
+goog.debug.LogRecord.prototype.level_;
+
+
+/**
+ * Message associated with the record
+ * @type {string}
+ * @private
+ */
+goog.debug.LogRecord.prototype.msg_;
+
+
+/**
+ * Name of the logger that created the record.
+ * @type {string}
+ * @private
+ */
+goog.debug.LogRecord.prototype.loggerName_;
+
+
+/**
+ * Sequence number for the LogRecord. Each record has a unique sequence number
+ * that is greater than all log records created before it.
+ * @type {number}
+ * @private
+ */
+goog.debug.LogRecord.prototype.sequenceNumber_ = 0;
+
+
+/**
+ * Exception associated with the record
+ * @type {Object}
+ * @private
+ */
+goog.debug.LogRecord.prototype.exception_ = null;
+
+
+/**
+ * @define {boolean} Whether to enable log sequence numbers.
+ */
+goog.define('goog.debug.LogRecord.ENABLE_SEQUENCE_NUMBERS', true);
+
+
+/**
+ * A sequence counter for assigning increasing sequence numbers to LogRecord
+ * objects.
+ * @type {number}
+ * @private
+ */
+goog.debug.LogRecord.nextSequenceNumber_ = 0;
+
+
+/**
+ * Sets all fields of the log record.
+ * @param {goog.debug.Logger.Level} level One of the level identifiers.
+ * @param {string} msg The string message.
+ * @param {string} loggerName The name of the source logger.
+ * @param {number=} opt_time Time this log record was created if other than now.
+ *     If 0, we use #goog.now.
+ * @param {number=} opt_sequenceNumber Sequence number of this log record. This
+ *     should only be passed in when restoring a log record from persistence.
+ */
+goog.debug.LogRecord.prototype.reset = function(level, msg, loggerName,
+    opt_time, opt_sequenceNumber) {
+  if (goog.debug.LogRecord.ENABLE_SEQUENCE_NUMBERS) {
+    this.sequenceNumber_ = typeof opt_sequenceNumber == 'number' ?
+        opt_sequenceNumber : goog.debug.LogRecord.nextSequenceNumber_++;
+  }
+
+  this.time_ = opt_time || goog.now();
+  this.level_ = level;
+  this.msg_ = msg;
+  this.loggerName_ = loggerName;
+  delete this.exception_;
+};
+
+
+/**
+ * Get the source Logger's name.
+ *
+ * @return {string} source logger name (may be null).
+ */
+goog.debug.LogRecord.prototype.getLoggerName = function() {
+  return this.loggerName_;
+};
+
+
+/**
+ * Get the exception that is part of the log record.
+ *
+ * @return {Object} the exception.
+ */
+goog.debug.LogRecord.prototype.getException = function() {
+  return this.exception_;
+};
+
+
+/**
+ * Set the exception that is part of the log record.
+ *
+ * @param {Object} exception the exception.
+ */
+goog.debug.LogRecord.prototype.setException = function(exception) {
+  this.exception_ = exception;
+};
+
+
+/**
+ * Get the source Logger's name.
+ *
+ * @param {string} loggerName source logger name (may be null).
+ */
+goog.debug.LogRecord.prototype.setLoggerName = function(loggerName) {
+  this.loggerName_ = loggerName;
+};
+
+
+/**
+ * Get the logging message level, for example Level.SEVERE.
+ * @return {goog.debug.Logger.Level} the logging message level.
+ */
+goog.debug.LogRecord.prototype.getLevel = function() {
+  return this.level_;
+};
+
+
+/**
+ * Set the logging message level, for example Level.SEVERE.
+ * @param {goog.debug.Logger.Level} level the logging message level.
+ */
+goog.debug.LogRecord.prototype.setLevel = function(level) {
+  this.level_ = level;
+};
+
+
+/**
+ * Get the "raw" log message, before localization or formatting.
+ *
+ * @return {string} the raw message string.
+ */
+goog.debug.LogRecord.prototype.getMessage = function() {
+  return this.msg_;
+};
+
+
+/**
+ * Set the "raw" log message, before localization or formatting.
+ *
+ * @param {string} msg the raw message string.
+ */
+goog.debug.LogRecord.prototype.setMessage = function(msg) {
+  this.msg_ = msg;
+};
+
+
+/**
+ * Get event time in milliseconds since 1970.
+ *
+ * @return {number} event time in millis since 1970.
+ */
+goog.debug.LogRecord.prototype.getMillis = function() {
+  return this.time_;
+};
+
+
+/**
+ * Set event time in milliseconds since 1970.
+ *
+ * @param {number} time event time in millis since 1970.
+ */
+goog.debug.LogRecord.prototype.setMillis = function(time) {
+  this.time_ = time;
+};
+
+
+/**
+ * Get the sequence number.
+ * <p>
+ * Sequence numbers are normally assigned in the LogRecord
+ * constructor, which assigns unique sequence numbers to
+ * each new LogRecord in increasing order.
+ * @return {number} the sequence number.
+ */
+goog.debug.LogRecord.prototype.getSequenceNumber = function() {
+  return this.sequenceNumber_;
+};
+
+
+// Copyright 2010 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview A buffer for log records. The purpose of this is to improve
+ * logging performance by re-using old objects when the buffer becomes full and
+ * to eliminate the need for each app to implement their own log buffer. The
+ * disadvantage to doing this is that log handlers cannot maintain references to
+ * log records and expect that they are not overwriten at a later point.
+ *
+ * @author agrieve@google.com (Andrew Grieve)
+ */
+
+goog.provide('goog.debug.LogBuffer');
+
+goog.require('goog.asserts');
+goog.require('goog.debug.LogRecord');
+
+
+
+/**
+ * Creates the log buffer.
+ * @constructor
+ * @final
+ */
+goog.debug.LogBuffer = function() {
+  goog.asserts.assert(goog.debug.LogBuffer.isBufferingEnabled(),
+      'Cannot use goog.debug.LogBuffer without defining ' +
+      'goog.debug.LogBuffer.CAPACITY.');
+  this.clear();
+};
+
+
+/**
+ * A static method that always returns the same instance of LogBuffer.
+ * @return {!goog.debug.LogBuffer} The LogBuffer singleton instance.
+ */
+goog.debug.LogBuffer.getInstance = function() {
+  if (!goog.debug.LogBuffer.instance_) {
+    // This function is written with the return statement after the assignment
+    // to avoid the jscompiler StripCode bug described in http://b/2608064.
+    // After that bug is fixed this can be refactored.
+    goog.debug.LogBuffer.instance_ = new goog.debug.LogBuffer();
+  }
+  return goog.debug.LogBuffer.instance_;
+};
+
+
+/**
+ * @define {number} The number of log records to buffer. 0 means disable
+ * buffering.
+ */
+goog.define('goog.debug.LogBuffer.CAPACITY', 0);
+
+
+/**
+ * The array to store the records.
+ * @type {!Array<!goog.debug.LogRecord|undefined>}
+ * @private
+ */
+goog.debug.LogBuffer.prototype.buffer_;
+
+
+/**
+ * The index of the most recently added record or -1 if there are no records.
+ * @type {number}
+ * @private
+ */
+goog.debug.LogBuffer.prototype.curIndex_;
+
+
+/**
+ * Whether the buffer is at capacity.
+ * @type {boolean}
+ * @private
+ */
+goog.debug.LogBuffer.prototype.isFull_;
+
+
+/**
+ * Adds a log record to the buffer, possibly overwriting the oldest record.
+ * @param {goog.debug.Logger.Level} level One of the level identifiers.
+ * @param {string} msg The string message.
+ * @param {string} loggerName The name of the source logger.
+ * @return {!goog.debug.LogRecord} The log record.
+ */
+goog.debug.LogBuffer.prototype.addRecord = function(level, msg, loggerName) {
+  var curIndex = (this.curIndex_ + 1) % goog.debug.LogBuffer.CAPACITY;
+  this.curIndex_ = curIndex;
+  if (this.isFull_) {
+    var ret = this.buffer_[curIndex];
+    ret.reset(level, msg, loggerName);
+    return ret;
+  }
+  this.isFull_ = curIndex == goog.debug.LogBuffer.CAPACITY - 1;
+  return this.buffer_[curIndex] =
+      new goog.debug.LogRecord(level, msg, loggerName);
+};
+
+
+/**
+ * @return {boolean} Whether the log buffer is enabled.
+ */
+goog.debug.LogBuffer.isBufferingEnabled = function() {
+  return goog.debug.LogBuffer.CAPACITY > 0;
+};
+
+
+/**
+ * Removes all buffered log records.
+ */
+goog.debug.LogBuffer.prototype.clear = function() {
+  this.buffer_ = new Array(goog.debug.LogBuffer.CAPACITY);
+  this.curIndex_ = -1;
+  this.isFull_ = false;
+};
+
+
+/**
+ * Calls the given function for each buffered log record, starting with the
+ * oldest one.
+ * @param {function(!goog.debug.LogRecord)} func The function to call.
+ */
+goog.debug.LogBuffer.prototype.forEachRecord = function(func) {
+  var buffer = this.buffer_;
+  // Corner case: no records.
+  if (!buffer[0]) {
+    return;
+  }
+  var curIndex = this.curIndex_;
+  var i = this.isFull_ ? curIndex : -1;
+  do {
+    i = (i + 1) % goog.debug.LogBuffer.CAPACITY;
+    func(/** @type {!goog.debug.LogRecord} */ (buffer[i]));
+  } while (i != curIndex);
+};
+
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Definition of the Logger class. Please minimize dependencies
+ * this file has on other closure classes as any dependency it takes won't be
+ * able to use the logging infrastructure.
+ *
+ * @see ../demos/debug.html
+ */
+
+goog.provide('goog.debug.LogManager');
+goog.provide('goog.debug.Loggable');
+goog.provide('goog.debug.Logger');
+goog.provide('goog.debug.Logger.Level');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.debug');
+goog.require('goog.debug.LogBuffer');
+goog.require('goog.debug.LogRecord');
+
+
+/**
+ * A message value that can be handled by a Logger.
+ *
+ * Functions are treated like callbacks, but are only called when the event's
+ * log level is enabled. This is useful for logging messages that are expensive
+ * to construct.
+ *
+ * @typedef {string|function(): string}
+ */
+goog.debug.Loggable;
+
+
+
+/**
+ * The Logger is an object used for logging debug messages. Loggers are
+ * normally named, using a hierarchical dot-separated namespace. Logger names
+ * can be arbitrary strings, but they should normally be based on the package
+ * name or class name of the logged component, such as goog.net.BrowserChannel.
+ *
+ * The Logger object is loosely based on the java class
+ * java.util.logging.Logger. It supports different levels of filtering for
+ * different loggers.
+ *
+ * The logger object should never be instantiated by application code. It
+ * should always use the goog.debug.Logger.getLogger function.
+ *
+ * @constructor
+ * @param {string} name The name of the Logger.
+ * @final
+ */
+goog.debug.Logger = function(name) {
+  /**
+   * Name of the Logger. Generally a dot-separated namespace
+   * @private {string}
+   */
+  this.name_ = name;
+
+  /**
+   * Parent Logger.
+   * @private {goog.debug.Logger}
+   */
+  this.parent_ = null;
+
+  /**
+   * Level that this logger only filters above. Null indicates it should
+   * inherit from the parent.
+   * @private {goog.debug.Logger.Level}
+   */
+  this.level_ = null;
+
+  /**
+   * Map of children loggers. The keys are the leaf names of the children and
+   * the values are the child loggers.
+   * @private {Object}
+   */
+  this.children_ = null;
+
+  /**
+   * Handlers that are listening to this logger.
+   * @private {Array<Function>}
+   */
+  this.handlers_ = null;
+};
+
+
+/** @const */
+goog.debug.Logger.ROOT_LOGGER_NAME = '';
+
+
+/**
+ * @define {boolean} Toggles whether loggers other than the root logger can have
+ *     log handlers attached to them and whether they can have their log level
+ *     set. Logging is a bit faster when this is set to false.
+ */
+goog.define('goog.debug.Logger.ENABLE_HIERARCHY', true);
+
+
+if (!goog.debug.Logger.ENABLE_HIERARCHY) {
+  /**
+   * @type {!Array<Function>}
+   * @private
+   */
+  goog.debug.Logger.rootHandlers_ = [];
+
+
+  /**
+   * @type {goog.debug.Logger.Level}
+   * @private
+   */
+  goog.debug.Logger.rootLevel_;
+}
+
+
+
+/**
+ * The Level class defines a set of standard logging levels that
+ * can be used to control logging output.  The logging Level objects
+ * are ordered and are specified by ordered integers.  Enabling logging
+ * at a given level also enables logging at all higher levels.
+ * <p>
+ * Clients should normally use the predefined Level constants such
+ * as Level.SEVERE.
+ * <p>
+ * The levels in descending order are:
+ * <ul>
+ * <li>SEVERE (highest value)
+ * <li>WARNING
+ * <li>INFO
+ * <li>CONFIG
+ * <li>FINE
+ * <li>FINER
+ * <li>FINEST  (lowest value)
+ * </ul>
+ * In addition there is a level OFF that can be used to turn
+ * off logging, and a level ALL that can be used to enable
+ * logging of all messages.
+ *
+ * @param {string} name The name of the level.
+ * @param {number} value The numeric value of the level.
+ * @constructor
+ * @final
+ */
+goog.debug.Logger.Level = function(name, value) {
+  /**
+   * The name of the level
+   * @type {string}
+   */
+  this.name = name;
+
+  /**
+   * The numeric value of the level
+   * @type {number}
+   */
+  this.value = value;
+};
+
+
+/**
+ * @return {string} String representation of the logger level.
+ * @override
+ */
+goog.debug.Logger.Level.prototype.toString = function() {
+  return this.name;
+};
+
+
+/**
+ * OFF is a special level that can be used to turn off logging.
+ * This level is initialized to <CODE>Infinity</CODE>.
+ * @type {!goog.debug.Logger.Level}
+ */
+goog.debug.Logger.Level.OFF =
+    new goog.debug.Logger.Level('OFF', Infinity);
+
+
+/**
+ * SHOUT is a message level for extra debugging loudness.
+ * This level is initialized to <CODE>1200</CODE>.
+ * @type {!goog.debug.Logger.Level}
+ */
+goog.debug.Logger.Level.SHOUT = new goog.debug.Logger.Level('SHOUT', 1200);
+
+
+/**
+ * SEVERE is a message level indicating a serious failure.
+ * This level is initialized to <CODE>1000</CODE>.
+ * @type {!goog.debug.Logger.Level}
+ */
+goog.debug.Logger.Level.SEVERE = new goog.debug.Logger.Level('SEVERE', 1000);
+
+
+/**
+ * WARNING is a message level indicating a potential problem.
+ * This level is initialized to <CODE>900</CODE>.
+ * @type {!goog.debug.Logger.Level}
+ */
+goog.debug.Logger.Level.WARNING = new goog.debug.Logger.Level('WARNING', 900);
+
+
+/**
+ * INFO is a message level for informational messages.
+ * This level is initialized to <CODE>800</CODE>.
+ * @type {!goog.debug.Logger.Level}
+ */
+goog.debug.Logger.Level.INFO = new goog.debug.Logger.Level('INFO', 800);
+
+
+/**
+ * CONFIG is a message level for static configuration messages.
+ * This level is initialized to <CODE>700</CODE>.
+ * @type {!goog.debug.Logger.Level}
+ */
+goog.debug.Logger.Level.CONFIG = new goog.debug.Logger.Level('CONFIG', 700);
+
+
+/**
+ * FINE is a message level providing tracing information.
+ * This level is initialized to <CODE>500</CODE>.
+ * @type {!goog.debug.Logger.Level}
+ */
+goog.debug.Logger.Level.FINE = new goog.debug.Logger.Level('FINE', 500);
+
+
+/**
+ * FINER indicates a fairly detailed tracing message.
+ * This level is initialized to <CODE>400</CODE>.
+ * @type {!goog.debug.Logger.Level}
+ */
+goog.debug.Logger.Level.FINER = new goog.debug.Logger.Level('FINER', 400);
+
+/**
+ * FINEST indicates a highly detailed tracing message.
+ * This level is initialized to <CODE>300</CODE>.
+ * @type {!goog.debug.Logger.Level}
+ */
+
+goog.debug.Logger.Level.FINEST = new goog.debug.Logger.Level('FINEST', 300);
+
+
+/**
+ * ALL indicates that all messages should be logged.
+ * This level is initialized to <CODE>0</CODE>.
+ * @type {!goog.debug.Logger.Level}
+ */
+goog.debug.Logger.Level.ALL = new goog.debug.Logger.Level('ALL', 0);
+
+
+/**
+ * The predefined levels.
+ * @type {!Array<!goog.debug.Logger.Level>}
+ * @final
+ */
+goog.debug.Logger.Level.PREDEFINED_LEVELS = [
+  goog.debug.Logger.Level.OFF,
+  goog.debug.Logger.Level.SHOUT,
+  goog.debug.Logger.Level.SEVERE,
+  goog.debug.Logger.Level.WARNING,
+  goog.debug.Logger.Level.INFO,
+  goog.debug.Logger.Level.CONFIG,
+  goog.debug.Logger.Level.FINE,
+  goog.debug.Logger.Level.FINER,
+  goog.debug.Logger.Level.FINEST,
+  goog.debug.Logger.Level.ALL];
+
+
+/**
+ * A lookup map used to find the level object based on the name or value of
+ * the level object.
+ * @type {Object}
+ * @private
+ */
+goog.debug.Logger.Level.predefinedLevelsCache_ = null;
+
+
+/**
+ * Creates the predefined levels cache and populates it.
+ * @private
+ */
+goog.debug.Logger.Level.createPredefinedLevelsCache_ = function() {
+  goog.debug.Logger.Level.predefinedLevelsCache_ = {};
+  for (var i = 0, level; level = goog.debug.Logger.Level.PREDEFINED_LEVELS[i];
+       i++) {
+    goog.debug.Logger.Level.predefinedLevelsCache_[level.value] = level;
+    goog.debug.Logger.Level.predefinedLevelsCache_[level.name] = level;
+  }
+};
+
+
+/**
+ * Gets the predefined level with the given name.
+ * @param {string} name The name of the level.
+ * @return {goog.debug.Logger.Level} The level, or null if none found.
+ */
+goog.debug.Logger.Level.getPredefinedLevel = function(name) {
+  if (!goog.debug.Logger.Level.predefinedLevelsCache_) {
+    goog.debug.Logger.Level.createPredefinedLevelsCache_();
+  }
+
+  return goog.debug.Logger.Level.predefinedLevelsCache_[name] || null;
+};
+
+
+/**
+ * Gets the highest predefined level <= #value.
+ * @param {number} value Level value.
+ * @return {goog.debug.Logger.Level} The level, or null if none found.
+ */
+goog.debug.Logger.Level.getPredefinedLevelByValue = function(value) {
+  if (!goog.debug.Logger.Level.predefinedLevelsCache_) {
+    goog.debug.Logger.Level.createPredefinedLevelsCache_();
+  }
+
+  if (value in goog.debug.Logger.Level.predefinedLevelsCache_) {
+    return goog.debug.Logger.Level.predefinedLevelsCache_[value];
+  }
+
+  for (var i = 0; i < goog.debug.Logger.Level.PREDEFINED_LEVELS.length; ++i) {
+    var level = goog.debug.Logger.Level.PREDEFINED_LEVELS[i];
+    if (level.value <= value) {
+      return level;
+    }
+  }
+  return null;
+};
+
+
+/**
+ * Finds or creates a logger for a named subsystem. If a logger has already been
+ * created with the given name it is returned. Otherwise a new logger is
+ * created. If a new logger is created its log level will be configured based
+ * on the LogManager configuration and it will configured to also send logging
+ * output to its parent's handlers. It will be registered in the LogManager
+ * global namespace.
+ *
+ * @param {string} name A name for the logger. This should be a dot-separated
+ * name and should normally be based on the package name or class name of the
+ * subsystem, such as goog.net.BrowserChannel.
+ * @return {!goog.debug.Logger} The named logger.
+ * @deprecated use goog.log instead. http://go/goog-debug-logger-deprecated
+ */
+goog.debug.Logger.getLogger = function(name) {
+  return goog.debug.LogManager.getLogger(name);
+};
+
+
+/**
+ * Logs a message to profiling tools, if available.
+ * {@see https://developers.google.com/web-toolkit/speedtracer/logging-api}
+ * {@see http://msdn.microsoft.com/en-us/library/dd433074(VS.85).aspx}
+ * @param {string} msg The message to log.
+ */
+goog.debug.Logger.logToProfilers = function(msg) {
+  // Using goog.global, as loggers might be used in window-less contexts.
+  if (goog.global['console']) {
+    if (goog.global['console']['timeStamp']) {
+      // Logs a message to Firebug, Web Inspector, SpeedTracer, etc.
+      goog.global['console']['timeStamp'](msg);
+    } else if (goog.global['console']['markTimeline']) {
+      // TODO(user): markTimeline is deprecated. Drop this else clause entirely
+      // after Chrome M14 hits stable.
+      goog.global['console']['markTimeline'](msg);
+    }
+  }
+
+  if (goog.global['msWriteProfilerMark']) {
+    // Logs a message to the Microsoft profiler
+    goog.global['msWriteProfilerMark'](msg);
+  }
+};
+
+
+/**
+ * Gets the name of this logger.
+ * @return {string} The name of this logger.
+ */
+goog.debug.Logger.prototype.getName = function() {
+  return this.name_;
+};
+
+
+/**
+ * Adds a handler to the logger. This doesn't use the event system because
+ * we want to be able to add logging to the event system.
+ * @param {Function} handler Handler function to add.
+ */
+goog.debug.Logger.prototype.addHandler = function(handler) {
+  if (goog.debug.LOGGING_ENABLED) {
+    if (goog.debug.Logger.ENABLE_HIERARCHY) {
+      if (!this.handlers_) {
+        this.handlers_ = [];
+      }
+      this.handlers_.push(handler);
+    } else {
+      goog.asserts.assert(!this.name_,
+          'Cannot call addHandler on a non-root logger when ' +
+          'goog.debug.Logger.ENABLE_HIERARCHY is false.');
+      goog.debug.Logger.rootHandlers_.push(handler);
+    }
+  }
+};
+
+
+/**
+ * Removes a handler from the logger. This doesn't use the event system because
+ * we want to be able to add logging to the event system.
+ * @param {Function} handler Handler function to remove.
+ * @return {boolean} Whether the handler was removed.
+ */
+goog.debug.Logger.prototype.removeHandler = function(handler) {
+  if (goog.debug.LOGGING_ENABLED) {
+    var handlers = goog.debug.Logger.ENABLE_HIERARCHY ? this.handlers_ :
+        goog.debug.Logger.rootHandlers_;
+    return !!handlers && goog.array.remove(handlers, handler);
+  } else {
+    return false;
+  }
+};
+
+
+/**
+ * Returns the parent of this logger.
+ * @return {goog.debug.Logger} The parent logger or null if this is the root.
+ */
+goog.debug.Logger.prototype.getParent = function() {
+  return this.parent_;
+};
+
+
+/**
+ * Returns the children of this logger as a map of the child name to the logger.
+ * @return {!Object} The map where the keys are the child leaf names and the
+ *     values are the Logger objects.
+ */
+goog.debug.Logger.prototype.getChildren = function() {
+  if (!this.children_) {
+    this.children_ = {};
+  }
+  return this.children_;
+};
+
+
+/**
+ * Set the log level specifying which message levels will be logged by this
+ * logger. Message levels lower than this value will be discarded.
+ * The level value Level.OFF can be used to turn off logging. If the new level
+ * is null, it means that this node should inherit its level from its nearest
+ * ancestor with a specific (non-null) level value.
+ *
+ * @param {goog.debug.Logger.Level} level The new level.
+ */
+goog.debug.Logger.prototype.setLevel = function(level) {
+  if (goog.debug.LOGGING_ENABLED) {
+    if (goog.debug.Logger.ENABLE_HIERARCHY) {
+      this.level_ = level;
+    } else {
+      goog.asserts.assert(!this.name_,
+          'Cannot call setLevel() on a non-root logger when ' +
+          'goog.debug.Logger.ENABLE_HIERARCHY is false.');
+      goog.debug.Logger.rootLevel_ = level;
+    }
+  }
+};
+
+
+/**
+ * Gets the log level specifying which message levels will be logged by this
+ * logger. Message levels lower than this value will be discarded.
+ * The level value Level.OFF can be used to turn off logging. If the level
+ * is null, it means that this node should inherit its level from its nearest
+ * ancestor with a specific (non-null) level value.
+ *
+ * @return {goog.debug.Logger.Level} The level.
+ */
+goog.debug.Logger.prototype.getLevel = function() {
+  return goog.debug.LOGGING_ENABLED ?
+      this.level_ : goog.debug.Logger.Level.OFF;
+};
+
+
+/**
+ * Returns the effective level of the logger based on its ancestors' levels.
+ * @return {goog.debug.Logger.Level} The level.
+ */
+goog.debug.Logger.prototype.getEffectiveLevel = function() {
+  if (!goog.debug.LOGGING_ENABLED) {
+    return goog.debug.Logger.Level.OFF;
+  }
+
+  if (!goog.debug.Logger.ENABLE_HIERARCHY) {
+    return goog.debug.Logger.rootLevel_;
+  }
+  if (this.level_) {
+    return this.level_;
+  }
+  if (this.parent_) {
+    return this.parent_.getEffectiveLevel();
+  }
+  goog.asserts.fail('Root logger has no level set.');
+  return null;
+};
+
+
+/**
+ * Checks if a message of the given level would actually be logged by this
+ * logger. This check is based on the Loggers effective level, which may be
+ * inherited from its parent.
+ * @param {goog.debug.Logger.Level} level The level to check.
+ * @return {boolean} Whether the message would be logged.
+ */
+goog.debug.Logger.prototype.isLoggable = function(level) {
+  return goog.debug.LOGGING_ENABLED &&
+      level.value >= this.getEffectiveLevel().value;
+};
+
+
+/**
+ * Logs a message. If the logger is currently enabled for the
+ * given message level then the given message is forwarded to all the
+ * registered output Handler objects.
+ * @param {goog.debug.Logger.Level} level One of the level identifiers.
+ * @param {goog.debug.Loggable} msg The message to log.
+ * @param {Error|Object=} opt_exception An exception associated with the
+ *     message.
+ */
+goog.debug.Logger.prototype.log = function(level, msg, opt_exception) {
+  // java caches the effective level, not sure it's necessary here
+  if (goog.debug.LOGGING_ENABLED && this.isLoggable(level)) {
+    // Message callbacks can be useful when a log message is expensive to build.
+    if (goog.isFunction(msg)) {
+      msg = msg();
+    }
+
+    this.doLogRecord_(this.getLogRecord(level, msg, opt_exception));
+  }
+};
+
+
+/**
+ * Creates a new log record and adds the exception (if present) to it.
+ * @param {goog.debug.Logger.Level} level One of the level identifiers.
+ * @param {string} msg The string message.
+ * @param {Error|Object=} opt_exception An exception associated with the
+ *     message.
+ * @return {!goog.debug.LogRecord} A log record.
+ * @suppress {es5Strict}
+ */
+goog.debug.Logger.prototype.getLogRecord = function(
+    level, msg, opt_exception) {
+  if (goog.debug.LogBuffer.isBufferingEnabled()) {
+    var logRecord =
+        goog.debug.LogBuffer.getInstance().addRecord(level, msg, this.name_);
+  } else {
+    logRecord = new goog.debug.LogRecord(level, String(msg), this.name_);
+  }
+  if (opt_exception) {
+    logRecord.setException(opt_exception);
+  }
+  return logRecord;
+};
+
+
+/**
+ * Logs a message at the Logger.Level.SHOUT level.
+ * If the logger is currently enabled for the given message level then the
+ * given message is forwarded to all the registered output Handler objects.
+ * @param {goog.debug.Loggable} msg The message to log.
+ * @param {Error=} opt_exception An exception associated with the message.
+ */
+goog.debug.Logger.prototype.shout = function(msg, opt_exception) {
+  if (goog.debug.LOGGING_ENABLED) {
+    this.log(goog.debug.Logger.Level.SHOUT, msg, opt_exception);
+  }
+};
+
+
+/**
+ * Logs a message at the Logger.Level.SEVERE level.
+ * If the logger is currently enabled for the given message level then the
+ * given message is forwarded to all the registered output Handler objects.
+ * @param {goog.debug.Loggable} msg The message to log.
+ * @param {Error=} opt_exception An exception associated with the message.
+ */
+goog.debug.Logger.prototype.severe = function(msg, opt_exception) {
+  if (goog.debug.LOGGING_ENABLED) {
+    this.log(goog.debug.Logger.Level.SEVERE, msg, opt_exception);
+  }
+};
+
+
+/**
+ * Logs a message at the Logger.Level.WARNING level.
+ * If the logger is currently enabled for the given message level then the
+ * given message is forwarded to all the registered output Handler objects.
+ * @param {goog.debug.Loggable} msg The message to log.
+ * @param {Error=} opt_exception An exception associated with the message.
+ */
+goog.debug.Logger.prototype.warning = function(msg, opt_exception) {
+  if (goog.debug.LOGGING_ENABLED) {
+    this.log(goog.debug.Logger.Level.WARNING, msg, opt_exception);
+  }
+};
+
+
+/**
+ * Logs a message at the Logger.Level.INFO level.
+ * If the logger is currently enabled for the given message level then the
+ * given message is forwarded to all the registered output Handler objects.
+ * @param {goog.debug.Loggable} msg The message to log.
+ * @param {Error=} opt_exception An exception associated with the message.
+ */
+goog.debug.Logger.prototype.info = function(msg, opt_exception) {
+  if (goog.debug.LOGGING_ENABLED) {
+    this.log(goog.debug.Logger.Level.INFO, msg, opt_exception);
+  }
+};
+
+
+/**
+ * Logs a message at the Logger.Level.CONFIG level.
+ * If the logger is currently enabled for the given message level then the
+ * given message is forwarded to all the registered output Handler objects.
+ * @param {goog.debug.Loggable} msg The message to log.
+ * @param {Error=} opt_exception An exception associated with the message.
+ */
+goog.debug.Logger.prototype.config = function(msg, opt_exception) {
+  if (goog.debug.LOGGING_ENABLED) {
+    this.log(goog.debug.Logger.Level.CONFIG, msg, opt_exception);
+  }
+};
+
+
+/**
+ * Logs a message at the Logger.Level.FINE level.
+ * If the logger is currently enabled for the given message level then the
+ * given message is forwarded to all the registered output Handler objects.
+ * @param {goog.debug.Loggable} msg The message to log.
+ * @param {Error=} opt_exception An exception associated with the message.
+ */
+goog.debug.Logger.prototype.fine = function(msg, opt_exception) {
+  if (goog.debug.LOGGING_ENABLED) {
+    this.log(goog.debug.Logger.Level.FINE, msg, opt_exception);
+  }
+};
+
+
+/**
+ * Logs a message at the Logger.Level.FINER level.
+ * If the logger is currently enabled for the given message level then the
+ * given message is forwarded to all the registered output Handler objects.
+ * @param {goog.debug.Loggable} msg The message to log.
+ * @param {Error=} opt_exception An exception associated with the message.
+ */
+goog.debug.Logger.prototype.finer = function(msg, opt_exception) {
+  if (goog.debug.LOGGING_ENABLED) {
+    this.log(goog.debug.Logger.Level.FINER, msg, opt_exception);
+  }
+};
+
+
+/**
+ * Logs a message at the Logger.Level.FINEST level.
+ * If the logger is currently enabled for the given message level then the
+ * given message is forwarded to all the registered output Handler objects.
+ * @param {goog.debug.Loggable} msg The message to log.
+ * @param {Error=} opt_exception An exception associated with the message.
+ */
+goog.debug.Logger.prototype.finest = function(msg, opt_exception) {
+  if (goog.debug.LOGGING_ENABLED) {
+    this.log(goog.debug.Logger.Level.FINEST, msg, opt_exception);
+  }
+};
+
+
+/**
+ * Logs a LogRecord. If the logger is currently enabled for the
+ * given message level then the given message is forwarded to all the
+ * registered output Handler objects.
+ * @param {goog.debug.LogRecord} logRecord A log record to log.
+ */
+goog.debug.Logger.prototype.logRecord = function(logRecord) {
+  if (goog.debug.LOGGING_ENABLED && this.isLoggable(logRecord.getLevel())) {
+    this.doLogRecord_(logRecord);
+  }
+};
+
+
+/**
+ * Logs a LogRecord.
+ * @param {goog.debug.LogRecord} logRecord A log record to log.
+ * @private
+ */
+goog.debug.Logger.prototype.doLogRecord_ = function(logRecord) {
+  goog.debug.Logger.logToProfilers('log:' + logRecord.getMessage());
+  if (goog.debug.Logger.ENABLE_HIERARCHY) {
+    var target = this;
+    while (target) {
+      target.callPublish_(logRecord);
+      target = target.getParent();
+    }
+  } else {
+    for (var i = 0, handler; handler = goog.debug.Logger.rootHandlers_[i++]; ) {
+      handler(logRecord);
+    }
+  }
+};
+
+
+/**
+ * Calls the handlers for publish.
+ * @param {goog.debug.LogRecord} logRecord The log record to publish.
+ * @private
+ */
+goog.debug.Logger.prototype.callPublish_ = function(logRecord) {
+  if (this.handlers_) {
+    for (var i = 0, handler; handler = this.handlers_[i]; i++) {
+      handler(logRecord);
+    }
+  }
+};
+
+
+/**
+ * Sets the parent of this logger. This is used for setting up the logger tree.
+ * @param {goog.debug.Logger} parent The parent logger.
+ * @private
+ */
+goog.debug.Logger.prototype.setParent_ = function(parent) {
+  this.parent_ = parent;
+};
+
+
+/**
+ * Adds a child to this logger. This is used for setting up the logger tree.
+ * @param {string} name The leaf name of the child.
+ * @param {goog.debug.Logger} logger The child logger.
+ * @private
+ */
+goog.debug.Logger.prototype.addChild_ = function(name, logger) {
+  this.getChildren()[name] = logger;
+};
+
+
+/**
+ * There is a single global LogManager object that is used to maintain a set of
+ * shared state about Loggers and log services. This is loosely based on the
+ * java class java.util.logging.LogManager.
+ * @const
+ */
+goog.debug.LogManager = {};
+
+
+/**
+ * Map of logger names to logger objects.
+ *
+ * @type {!Object<string, !goog.debug.Logger>}
+ * @private
+ */
+goog.debug.LogManager.loggers_ = {};
+
+
+/**
+ * The root logger which is the root of the logger tree.
+ * @type {goog.debug.Logger}
+ * @private
+ */
+goog.debug.LogManager.rootLogger_ = null;
+
+
+/**
+ * Initializes the LogManager if not already initialized.
+ */
+goog.debug.LogManager.initialize = function() {
+  if (!goog.debug.LogManager.rootLogger_) {
+    goog.debug.LogManager.rootLogger_ = new goog.debug.Logger(
+        goog.debug.Logger.ROOT_LOGGER_NAME);
+    goog.debug.LogManager.loggers_[goog.debug.Logger.ROOT_LOGGER_NAME] =
+        goog.debug.LogManager.rootLogger_;
+    goog.debug.LogManager.rootLogger_.setLevel(goog.debug.Logger.Level.CONFIG);
+  }
+};
+
+
+/**
+ * Returns all the loggers.
+ * @return {!Object<string, !goog.debug.Logger>} Map of logger names to logger
+ *     objects.
+ */
+goog.debug.LogManager.getLoggers = function() {
+  return goog.debug.LogManager.loggers_;
+};
+
+
+/**
+ * Returns the root of the logger tree namespace, the logger with the empty
+ * string as its name.
+ *
+ * @return {!goog.debug.Logger} The root logger.
+ */
+goog.debug.LogManager.getRoot = function() {
+  goog.debug.LogManager.initialize();
+  return /** @type {!goog.debug.Logger} */ (goog.debug.LogManager.rootLogger_);
+};
+
+
+/**
+ * Finds a named logger.
+ *
+ * @param {string} name A name for the logger. This should be a dot-separated
+ * name and should normally be based on the package name or class name of the
+ * subsystem, such as goog.net.BrowserChannel.
+ * @return {!goog.debug.Logger} The named logger.
+ */
+goog.debug.LogManager.getLogger = function(name) {
+  goog.debug.LogManager.initialize();
+  var ret = goog.debug.LogManager.loggers_[name];
+  return ret || goog.debug.LogManager.createLogger_(name);
+};
+
+
+/**
+ * Creates a function that can be passed to goog.debug.catchErrors. The function
+ * will log all reported errors using the given logger.
+ * @param {goog.debug.Logger=} opt_logger The logger to log the errors to.
+ *     Defaults to the root logger.
+ * @return {function(Object)} The created function.
+ */
+goog.debug.LogManager.createFunctionForCatchErrors = function(opt_logger) {
+  return function(info) {
+    var logger = opt_logger || goog.debug.LogManager.getRoot();
+    logger.severe('Error: ' + info.message + ' (' + info.fileName +
+                  ' @ Line: ' + info.line + ')');
+  };
+};
+
+
+/**
+ * Creates the named logger. Will also create the parents of the named logger
+ * if they don't yet exist.
+ * @param {string} name The name of the logger.
+ * @return {!goog.debug.Logger} The named logger.
+ * @private
+ */
+goog.debug.LogManager.createLogger_ = function(name) {
+  // find parent logger
+  var logger = new goog.debug.Logger(name);
+  if (goog.debug.Logger.ENABLE_HIERARCHY) {
+    var lastDotIndex = name.lastIndexOf('.');
+    var parentName = name.substr(0, lastDotIndex);
+    var leafName = name.substr(lastDotIndex + 1);
+    var parentLogger = goog.debug.LogManager.getLogger(parentName);
+
+    // tell the parent about the child and the child about the parent
+    parentLogger.addChild_(leafName, logger);
+    logger.setParent_(parentLogger);
+  }
+
+  goog.debug.LogManager.loggers_[name] = logger;
+  return logger;
+};
+
+// Copyright 2007 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Definition the goog.debug.RelativeTimeProvider class.
+ *
+ */
+
+goog.provide('goog.debug.RelativeTimeProvider');
+
+
+
+/**
+ * A simple object to keep track of a timestamp considered the start of
+ * something. The main use is for the logger system to maintain a start time
+ * that is occasionally reset. For example, in Gmail, we reset this relative
+ * time at the start of a user action so that timings are offset from the
+ * beginning of the action. This class also provides a singleton as the default
+ * behavior for most use cases is to share the same start time.
+ *
+ * @constructor
+ * @final
+ */
+goog.debug.RelativeTimeProvider = function() {
+  /**
+   * The start time.
+   * @type {number}
+   * @private
+   */
+  this.relativeTimeStart_ = goog.now();
+};
+
+
+/**
+ * Default instance.
+ * @type {goog.debug.RelativeTimeProvider}
+ * @private
+ */
+goog.debug.RelativeTimeProvider.defaultInstance_ =
+    new goog.debug.RelativeTimeProvider();
+
+
+/**
+ * Sets the start time to the specified time.
+ * @param {number} timeStamp The start time.
+ */
+goog.debug.RelativeTimeProvider.prototype.set = function(timeStamp) {
+  this.relativeTimeStart_ = timeStamp;
+};
+
+
+/**
+ * Resets the start time to now.
+ */
+goog.debug.RelativeTimeProvider.prototype.reset = function() {
+  this.set(goog.now());
+};
+
+
+/**
+ * @return {number} The start time.
+ */
+goog.debug.RelativeTimeProvider.prototype.get = function() {
+  return this.relativeTimeStart_;
+};
+
+
+/**
+ * @return {goog.debug.RelativeTimeProvider} The default instance.
+ */
+goog.debug.RelativeTimeProvider.getDefaultInstance = function() {
+  return goog.debug.RelativeTimeProvider.defaultInstance_;
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Definition of various formatters for logging. Please minimize
+ * dependencies this file has on other closure classes as any dependency it
+ * takes won't be able to use the logging infrastructure.
+ *
+ */
+
+goog.provide('goog.debug.Formatter');
+goog.provide('goog.debug.HtmlFormatter');
+goog.provide('goog.debug.TextFormatter');
+
+goog.require('goog.debug');
+goog.require('goog.debug.Logger');
+goog.require('goog.debug.RelativeTimeProvider');
+goog.require('goog.html.SafeHtml');
+
+
+
+/**
+ * Base class for Formatters. A Formatter is used to format a LogRecord into
+ * something that can be displayed to the user.
+ *
+ * @param {string=} opt_prefix The prefix to place before text records.
+ * @constructor
+ */
+goog.debug.Formatter = function(opt_prefix) {
+  this.prefix_ = opt_prefix || '';
+
+  /**
+   * A provider that returns the relative start time.
+   * @type {goog.debug.RelativeTimeProvider}
+   * @private
+   */
+  this.startTimeProvider_ =
+      goog.debug.RelativeTimeProvider.getDefaultInstance();
+};
+
+
+/**
+ * Whether to append newlines to the end of formatted log records.
+ * @type {boolean}
+ */
+goog.debug.Formatter.prototype.appendNewline = true;
+
+
+/**
+ * Whether to show absolute time in the DebugWindow.
+ * @type {boolean}
+ */
+goog.debug.Formatter.prototype.showAbsoluteTime = true;
+
+
+/**
+ * Whether to show relative time in the DebugWindow.
+ * @type {boolean}
+ */
+goog.debug.Formatter.prototype.showRelativeTime = true;
+
+
+/**
+ * Whether to show the logger name in the DebugWindow.
+ * @type {boolean}
+ */
+goog.debug.Formatter.prototype.showLoggerName = true;
+
+
+/**
+ * Whether to show the logger exception text.
+ * @type {boolean}
+ */
+goog.debug.Formatter.prototype.showExceptionText = false;
+
+
+/**
+ * Whether to show the severity level.
+ * @type {boolean}
+ */
+goog.debug.Formatter.prototype.showSeverityLevel = false;
+
+
+/**
+ * Formats a record.
+ * @param {goog.debug.LogRecord} logRecord the logRecord to format.
+ * @return {string} The formatted string.
+ */
+goog.debug.Formatter.prototype.formatRecord = goog.abstractMethod;
+
+
+/**
+ * Formats a record as SafeHtml.
+ * @param {goog.debug.LogRecord} logRecord the logRecord to format.
+ * @return {!goog.html.SafeHtml} The formatted string as SafeHtml.
+ */
+goog.debug.Formatter.prototype.formatRecordAsHtml = goog.abstractMethod;
+
+
+/**
+ * Sets the start time provider. By default, this is the default instance
+ * but can be changed.
+ * @param {goog.debug.RelativeTimeProvider} provider The provider to use.
+ */
+goog.debug.Formatter.prototype.setStartTimeProvider = function(provider) {
+  this.startTimeProvider_ = provider;
+};
+
+
+/**
+ * Returns the start time provider. By default, this is the default instance
+ * but can be changed.
+ * @return {goog.debug.RelativeTimeProvider} The start time provider.
+ */
+goog.debug.Formatter.prototype.getStartTimeProvider = function() {
+  return this.startTimeProvider_;
+};
+
+
+/**
+ * Resets the start relative time.
+ */
+goog.debug.Formatter.prototype.resetRelativeTimeStart = function() {
+  this.startTimeProvider_.reset();
+};
+
+
+/**
+ * Returns a string for the time/date of the LogRecord.
+ * @param {goog.debug.LogRecord} logRecord The record to get a time stamp for.
+ * @return {string} A string representation of the time/date of the LogRecord.
+ * @private
+ */
+goog.debug.Formatter.getDateTimeStamp_ = function(logRecord) {
+  var time = new Date(logRecord.getMillis());
+  return goog.debug.Formatter.getTwoDigitString_((time.getFullYear() - 2000)) +
+         goog.debug.Formatter.getTwoDigitString_((time.getMonth() + 1)) +
+         goog.debug.Formatter.getTwoDigitString_(time.getDate()) + ' ' +
+         goog.debug.Formatter.getTwoDigitString_(time.getHours()) + ':' +
+         goog.debug.Formatter.getTwoDigitString_(time.getMinutes()) + ':' +
+         goog.debug.Formatter.getTwoDigitString_(time.getSeconds()) + '.' +
+         goog.debug.Formatter.getTwoDigitString_(
+             Math.floor(time.getMilliseconds() / 10));
+};
+
+
+/**
+ * Returns the number as a two-digit string, meaning it prepends a 0 if the
+ * number if less than 10.
+ * @param {number} n The number to format.
+ * @return {string} A two-digit string representation of {@code n}.
+ * @private
+ */
+goog.debug.Formatter.getTwoDigitString_ = function(n) {
+  if (n < 10) {
+    return '0' + n;
+  }
+  return String(n);
+};
+
+
+/**
+ * Returns a string for the number of seconds relative to the start time.
+ * Prepads with spaces so that anything less than 1000 seconds takes up the
+ * same number of characters for better formatting.
+ * @param {goog.debug.LogRecord} logRecord The log to compare time to.
+ * @param {number} relativeTimeStart The start time to compare to.
+ * @return {string} The number of seconds of the LogRecord relative to the
+ *     start time.
+ * @private
+ */
+goog.debug.Formatter.getRelativeTime_ = function(logRecord,
+                                                 relativeTimeStart) {
+  var ms = logRecord.getMillis() - relativeTimeStart;
+  var sec = ms / 1000;
+  var str = sec.toFixed(3);
+
+  var spacesToPrepend = 0;
+  if (sec < 1) {
+    spacesToPrepend = 2;
+  } else {
+    while (sec < 100) {
+      spacesToPrepend++;
+      sec *= 10;
+    }
+  }
+  while (spacesToPrepend-- > 0) {
+    str = ' ' + str;
+  }
+  return str;
+};
+
+
+
+/**
+ * Formatter that returns formatted html. See formatRecord for the classes
+ * it uses for various types of formatted output.
+ *
+ * @param {string=} opt_prefix The prefix to place before text records.
+ * @constructor
+ * @extends {goog.debug.Formatter}
+ */
+goog.debug.HtmlFormatter = function(opt_prefix) {
+  goog.debug.Formatter.call(this, opt_prefix);
+};
+goog.inherits(goog.debug.HtmlFormatter, goog.debug.Formatter);
+
+
+/**
+ * Whether to show the logger exception text
+ * @type {boolean}
+ * @override
+ */
+goog.debug.HtmlFormatter.prototype.showExceptionText = true;
+
+
+/**
+ * Formats a record
+ * @param {goog.debug.LogRecord} logRecord the logRecord to format.
+ * @return {string} The formatted string as html.
+ * @override
+ */
+goog.debug.HtmlFormatter.prototype.formatRecord = function(logRecord) {
+  if (!logRecord) {
+    return '';
+  }
+  // OK not to use goog.html.SafeHtml.unwrap() here.
+  return this.formatRecordAsHtml(logRecord).getTypedStringValue();
+};
+
+
+/**
+ * Formats a record.
+ * @param {goog.debug.LogRecord} logRecord the logRecord to format.
+ * @return {!goog.html.SafeHtml} The formatted string as SafeHtml.
+ * @override
+ */
+goog.debug.HtmlFormatter.prototype.formatRecordAsHtml = function(logRecord) {
+  if (!logRecord) {
+    return goog.html.SafeHtml.EMPTY;
+  }
+
+  var className;
+  switch (logRecord.getLevel().value) {
+    case goog.debug.Logger.Level.SHOUT.value:
+      className = 'dbg-sh';
+      break;
+    case goog.debug.Logger.Level.SEVERE.value:
+      className = 'dbg-sev';
+      break;
+    case goog.debug.Logger.Level.WARNING.value:
+      className = 'dbg-w';
+      break;
+    case goog.debug.Logger.Level.INFO.value:
+      className = 'dbg-i';
+      break;
+    case goog.debug.Logger.Level.FINE.value:
+    default:
+      className = 'dbg-f';
+      break;
+  }
+
+  // HTML for user defined prefix, time, logger name, and severity.
+  var sb = [];
+  sb.push(this.prefix_, ' ');
+  if (this.showAbsoluteTime) {
+    sb.push('[', goog.debug.Formatter.getDateTimeStamp_(logRecord), '] ');
+  }
+  if (this.showRelativeTime) {
+    sb.push('[',
+        goog.debug.Formatter.getRelativeTime_(
+            logRecord, this.startTimeProvider_.get()),
+        's] ');
+  }
+  if (this.showLoggerName) {
+    sb.push('[', logRecord.getLoggerName(), '] ');
+  }
+  if (this.showSeverityLevel) {
+    sb.push('[', logRecord.getLevel().name, '] ');
+  }
+  var fullPrefixHtml =
+      goog.html.SafeHtml.htmlEscapePreservingNewlinesAndSpaces(sb.join(''));
+
+  // HTML for exception text and log record.
+  var exceptionHtml = goog.html.SafeHtml.EMPTY;
+  if (this.showExceptionText && logRecord.getException()) {
+    exceptionHtml = goog.html.SafeHtml.concat(
+        goog.html.SafeHtml.create('br'),
+        goog.debug.exposeExceptionAsHtml(logRecord.getException()));
+  }
+  var logRecordHtml = goog.html.SafeHtml.htmlEscapePreservingNewlinesAndSpaces(
+      logRecord.getMessage());
+  var recordAndExceptionHtml = goog.html.SafeHtml.create(
+      'span',
+      {'class': className},
+      goog.html.SafeHtml.concat(logRecordHtml, exceptionHtml));
+
+
+  // Combine both pieces of HTML and, if needed, append a final newline.
+  var html;
+  if (this.appendNewline) {
+    html = goog.html.SafeHtml.concat(fullPrefixHtml, recordAndExceptionHtml,
+        goog.html.SafeHtml.create('br'));
+  } else {
+    html = goog.html.SafeHtml.concat(fullPrefixHtml, recordAndExceptionHtml);
+  }
+  return html;
+};
+
+
+
+/**
+ * Formatter that returns formatted plain text
+ *
+ * @param {string=} opt_prefix The prefix to place before text records.
+ * @constructor
+ * @extends {goog.debug.Formatter}
+ * @final
+ */
+goog.debug.TextFormatter = function(opt_prefix) {
+  goog.debug.Formatter.call(this, opt_prefix);
+};
+goog.inherits(goog.debug.TextFormatter, goog.debug.Formatter);
+
+
+/**
+ * Formats a record as text
+ * @param {goog.debug.LogRecord} logRecord the logRecord to format.
+ * @return {string} The formatted string.
+ * @override
+ */
+goog.debug.TextFormatter.prototype.formatRecord = function(logRecord) {
+  var sb = [];
+  sb.push(this.prefix_, ' ');
+  if (this.showAbsoluteTime) {
+    sb.push('[', goog.debug.Formatter.getDateTimeStamp_(logRecord), '] ');
+  }
+  if (this.showRelativeTime) {
+    sb.push('[', goog.debug.Formatter.getRelativeTime_(logRecord,
+        this.startTimeProvider_.get()), 's] ');
+  }
+
+  if (this.showLoggerName) {
+    sb.push('[', logRecord.getLoggerName(), '] ');
+  }
+  if (this.showSeverityLevel) {
+    sb.push('[', logRecord.getLevel().name, '] ');
+  }
+  sb.push(logRecord.getMessage());
+  if (this.showExceptionText) {
+    var exception = logRecord.getException();
+    if (exception) {
+      var exceptionText = exception instanceof Error ?
+          exception.message :
+          exception.toString();
+      sb.push('\n', exceptionText);
+    }
+  }
+  if (this.appendNewline) {
+    sb.push('\n');
+  }
+  return sb.join('');
+};
+
+
+/**
+ * Formats a record as text
+ * @param {goog.debug.LogRecord} logRecord the logRecord to format.
+ * @return {!goog.html.SafeHtml} The formatted string as SafeHtml. This is
+ *     just an HTML-escaped version of the text obtained from formatRecord().
+ * @override
+ */
+goog.debug.TextFormatter.prototype.formatRecordAsHtml = function(logRecord) {
+  return goog.html.SafeHtml.htmlEscapePreservingNewlinesAndSpaces(
+      goog.debug.TextFormatter.prototype.formatRecord(logRecord));
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Simple logger that logs to the window console if available.
+ *
+ * Has an autoInstall option which can be put into initialization code, which
+ * will start logging if "Debug=true" is in document.location.href
+ *
+ */
+
+goog.provide('goog.debug.Console');
+
+goog.require('goog.debug.LogManager');
+goog.require('goog.debug.Logger');
+goog.require('goog.debug.TextFormatter');
+
+
+
+/**
+ * Create and install a log handler that logs to window.console if available
+ * @constructor
+ */
+goog.debug.Console = function() {
+  this.publishHandler_ = goog.bind(this.addLogRecord, this);
+
+  /**
+   * Formatter for formatted output.
+   * @type {!goog.debug.TextFormatter}
+   * @private
+   */
+  this.formatter_ = new goog.debug.TextFormatter();
+  this.formatter_.showAbsoluteTime = false;
+  this.formatter_.showExceptionText = false;
+  // The console logging methods automatically append a newline.
+  this.formatter_.appendNewline = false;
+
+  this.isCapturing_ = false;
+  this.logBuffer_ = '';
+
+  /**
+   * Loggers that we shouldn't output.
+   * @type {!Object<boolean>}
+   * @private
+   */
+  this.filteredLoggers_ = {};
+};
+
+
+/**
+ * Returns the text formatter used by this console
+ * @return {!goog.debug.TextFormatter} The text formatter.
+ */
+goog.debug.Console.prototype.getFormatter = function() {
+  return this.formatter_;
+};
+
+
+/**
+ * Sets whether we are currently capturing logger output.
+ * @param {boolean} capturing Whether to capture logger output.
+ */
+goog.debug.Console.prototype.setCapturing = function(capturing) {
+  if (capturing == this.isCapturing_) {
+    return;
+  }
+
+  // attach or detach handler from the root logger
+  var rootLogger = goog.debug.LogManager.getRoot();
+  if (capturing) {
+    rootLogger.addHandler(this.publishHandler_);
+  } else {
+    rootLogger.removeHandler(this.publishHandler_);
+    this.logBuffer = '';
+  }
+  this.isCapturing_ = capturing;
+};
+
+
+/**
+ * Adds a log record.
+ * @param {goog.debug.LogRecord} logRecord The log entry.
+ */
+goog.debug.Console.prototype.addLogRecord = function(logRecord) {
+
+  // Check to see if the log record is filtered or not.
+  if (this.filteredLoggers_[logRecord.getLoggerName()]) {
+    return;
+  }
+
+  var record = this.formatter_.formatRecord(logRecord);
+  var console = goog.debug.Console.console_;
+  if (console) {
+    switch (logRecord.getLevel()) {
+      case goog.debug.Logger.Level.SHOUT:
+        goog.debug.Console.logToConsole_(console, 'info', record);
+        break;
+      case goog.debug.Logger.Level.SEVERE:
+        goog.debug.Console.logToConsole_(console, 'error', record);
+        break;
+      case goog.debug.Logger.Level.WARNING:
+        goog.debug.Console.logToConsole_(console, 'warn', record);
+        break;
+      default:
+        goog.debug.Console.logToConsole_(console, 'debug', record);
+        break;
+    }
+  } else {
+    this.logBuffer_ += record;
+  }
+};
+
+
+/**
+ * Adds a logger name to be filtered.
+ * @param {string} loggerName the logger name to add.
+ */
+goog.debug.Console.prototype.addFilter = function(loggerName) {
+  this.filteredLoggers_[loggerName] = true;
+};
+
+
+/**
+ * Removes a logger name to be filtered.
+ * @param {string} loggerName the logger name to remove.
+ */
+goog.debug.Console.prototype.removeFilter = function(loggerName) {
+  delete this.filteredLoggers_[loggerName];
+};
+
+
+/**
+ * Global console logger instance
+ * @type {goog.debug.Console}
+ */
+goog.debug.Console.instance = null;
+
+
+/**
+ * The console to which to log.  This is a property so it can be mocked out in
+ * this unit test for goog.debug.Console. Using goog.global, as console might be
+ * used in window-less contexts.
+ * @type {Object}
+ * @private
+ */
+goog.debug.Console.console_ = goog.global['console'];
+
+
+/**
+ * Sets the console to which to log.
+ * @param {!Object} console The console to which to log.
+ */
+goog.debug.Console.setConsole = function(console) {
+  goog.debug.Console.console_ = console;
+};
+
+
+/**
+ * Install the console and start capturing if "Debug=true" is in the page URL
+ */
+goog.debug.Console.autoInstall = function() {
+  if (!goog.debug.Console.instance) {
+    goog.debug.Console.instance = new goog.debug.Console();
+  }
+
+  if (goog.global.location &&
+      goog.global.location.href.indexOf('Debug=true') != -1) {
+    goog.debug.Console.instance.setCapturing(true);
+  }
+};
+
+
+/**
+ * Show an alert with all of the captured debug information.
+ * Information is only captured if console is not available
+ */
+goog.debug.Console.show = function() {
+  alert(goog.debug.Console.instance.logBuffer_);
+};
+
+
+/**
+ * Logs the record to the console using the given function.  If the function is
+ * not available on the console object, the log function is used instead.
+ * @param {!Object} console The console object.
+ * @param {string} fnName The name of the function to use.
+ * @param {string} record The record to log.
+ * @private
+ */
+goog.debug.Console.logToConsole_ = function(console, fnName, record) {
+  if (console[fnName]) {
+    console[fnName](record);
+  } else {
+    console.log(record);
+  }
+};
+
+// Copyright 2007 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Utility class that monitors viewport size changes.
+ *
+ * @author attila@google.com (Attila Bodis)
+ * @see ../demos/viewportsizemonitor.html
+ */
+
+goog.provide('goog.dom.ViewportSizeMonitor');
+
+goog.require('goog.dom');
+goog.require('goog.events');
+goog.require('goog.events.EventTarget');
+goog.require('goog.events.EventType');
+goog.require('goog.math.Size');
+
+
+
+/**
+ * This class can be used to monitor changes in the viewport size.  Instances
+ * dispatch a {@link goog.events.EventType.RESIZE} event when the viewport size
+ * changes.  Handlers can call {@link goog.dom.ViewportSizeMonitor#getSize} to
+ * get the new viewport size.
+ *
+ * Use this class if you want to execute resize/reflow logic each time the
+ * user resizes the browser window.  This class is guaranteed to only dispatch
+ * {@code RESIZE} events when the pixel dimensions of the viewport change.
+ * (Internet Explorer fires resize events if any element on the page is resized,
+ * even if the viewport dimensions are unchanged, which can lead to infinite
+ * resize loops.)
+ *
+ * Example usage:
+ *  <pre>
+ *    var vsm = new goog.dom.ViewportSizeMonitor();
+ *    goog.events.listen(vsm, goog.events.EventType.RESIZE, function(e) {
+ *      alert('Viewport size changed to ' + vsm.getSize());
+ *    });
+ *  </pre>
+ *
+ * Manually verified on IE6, IE7, FF2, Opera 11, Safari 4 and Chrome.
+ *
+ * @param {Window=} opt_window The window to monitor; defaults to the window in
+ *    which this code is executing.
+ * @constructor
+ * @extends {goog.events.EventTarget}
+ */
+goog.dom.ViewportSizeMonitor = function(opt_window) {
+  goog.dom.ViewportSizeMonitor.base(this, 'constructor');
+
+  /**
+   * The window to monitor. Defaults to the window in which the code is running.
+   * @private {Window}
+   */
+  this.window_ = opt_window || window;
+
+  /**
+   * Event listener key for window the window resize handler, as returned by
+   * {@link goog.events.listen}.
+   * @private {goog.events.Key}
+   */
+  this.listenerKey_ = goog.events.listen(this.window_,
+      goog.events.EventType.RESIZE, this.handleResize_, false, this);
+
+  /**
+   * The most recently recorded size of the viewport, in pixels.
+   * @private {goog.math.Size}
+   */
+  this.size_ = goog.dom.getViewportSize(this.window_);
+};
+goog.inherits(goog.dom.ViewportSizeMonitor, goog.events.EventTarget);
+
+
+/**
+ * Returns a viewport size monitor for the given window.  A new one is created
+ * if it doesn't exist already.  This prevents the unnecessary creation of
+ * multiple spooling monitors for a window.
+ * @param {Window=} opt_window The window to monitor; defaults to the window in
+ *     which this code is executing.
+ * @return {!goog.dom.ViewportSizeMonitor} Monitor for the given window.
+ */
+goog.dom.ViewportSizeMonitor.getInstanceForWindow = function(opt_window) {
+  var currentWindow = opt_window || window;
+  var uid = goog.getUid(currentWindow);
+
+  return goog.dom.ViewportSizeMonitor.windowInstanceMap_[uid] =
+      goog.dom.ViewportSizeMonitor.windowInstanceMap_[uid] ||
+      new goog.dom.ViewportSizeMonitor(currentWindow);
+};
+
+
+/**
+ * Removes and disposes a viewport size monitor for the given window if one
+ * exists.
+ * @param {Window=} opt_window The window whose monitor should be removed;
+ *     defaults to the window in which this code is executing.
+ */
+goog.dom.ViewportSizeMonitor.removeInstanceForWindow = function(opt_window) {
+  var uid = goog.getUid(opt_window || window);
+
+  goog.dispose(goog.dom.ViewportSizeMonitor.windowInstanceMap_[uid]);
+  delete goog.dom.ViewportSizeMonitor.windowInstanceMap_[uid];
+};
+
+
+/**
+ * Map of window hash code to viewport size monitor for that window, if
+ * created.
+ * @type {Object<number,goog.dom.ViewportSizeMonitor>}
+ * @private
+ */
+goog.dom.ViewportSizeMonitor.windowInstanceMap_ = {};
+
+
+/**
+ * Returns the most recently recorded size of the viewport, in pixels.  May
+ * return null if no window resize event has been handled yet.
+ * @return {goog.math.Size} The viewport dimensions, in pixels.
+ */
+goog.dom.ViewportSizeMonitor.prototype.getSize = function() {
+  // Return a clone instead of the original to preserve encapsulation.
+  return this.size_ ? this.size_.clone() : null;
+};
+
+
+/** @override */
+goog.dom.ViewportSizeMonitor.prototype.disposeInternal = function() {
+  goog.dom.ViewportSizeMonitor.superClass_.disposeInternal.call(this);
+
+  if (this.listenerKey_) {
+    goog.events.unlistenByKey(this.listenerKey_);
+    this.listenerKey_ = null;
+  }
+
+  this.window_ = null;
+  this.size_ = null;
+};
+
+
+/**
+ * Handles window resize events by measuring the dimensions of the
+ * viewport and dispatching a {@link goog.events.EventType.RESIZE} event if the
+ * current dimensions are different from the previous ones.
+ * @param {goog.events.Event} event The window resize event to handle.
+ * @private
+ */
+goog.dom.ViewportSizeMonitor.prototype.handleResize_ = function(event) {
+  var size = goog.dom.getViewportSize(this.window_);
+  if (!goog.math.Size.equals(size, this.size_)) {
+    this.size_ = size;
+    this.dispatchEvent(goog.events.EventType.RESIZE);
+  }
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Constant declarations for common key codes.
+ *
+ * @author eae@google.com (Emil A Eklund)
+ * @see ../demos/keyhandler.html
+ */
+
+goog.provide('goog.events.KeyCodes');
+
+goog.require('goog.userAgent');
+
+goog.forwardDeclare('goog.events.BrowserEvent');
+
+
+/**
+ * Key codes for common characters.
+ *
+ * This list is not localized and therefore some of the key codes are not
+ * correct for non US keyboard layouts. See comments below.
+ *
+ * @enum {number}
+ */
+goog.events.KeyCodes = {
+  WIN_KEY_FF_LINUX: 0,
+  MAC_ENTER: 3,
+  BACKSPACE: 8,
+  TAB: 9,
+  NUM_CENTER: 12,  // NUMLOCK on FF/Safari Mac
+  ENTER: 13,
+  SHIFT: 16,
+  CTRL: 17,
+  ALT: 18,
+  PAUSE: 19,
+  CAPS_LOCK: 20,
+  ESC: 27,
+  SPACE: 32,
+  PAGE_UP: 33,     // also NUM_NORTH_EAST
+  PAGE_DOWN: 34,   // also NUM_SOUTH_EAST
+  END: 35,         // also NUM_SOUTH_WEST
+  HOME: 36,        // also NUM_NORTH_WEST
+  LEFT: 37,        // also NUM_WEST
+  UP: 38,          // also NUM_NORTH
+  RIGHT: 39,       // also NUM_EAST
+  DOWN: 40,        // also NUM_SOUTH
+  PLUS_SIGN: 43,   // NOT numpad plus
+  PRINT_SCREEN: 44,
+  INSERT: 45,      // also NUM_INSERT
+  DELETE: 46,      // also NUM_DELETE
+  ZERO: 48,
+  ONE: 49,
+  TWO: 50,
+  THREE: 51,
+  FOUR: 52,
+  FIVE: 53,
+  SIX: 54,
+  SEVEN: 55,
+  EIGHT: 56,
+  NINE: 57,
+  FF_SEMICOLON: 59, // Firefox (Gecko) fires this for semicolon instead of 186
+  FF_EQUALS: 61, // Firefox (Gecko) fires this for equals instead of 187
+  FF_DASH: 173, // Firefox (Gecko) fires this for dash instead of 189
+  QUESTION_MARK: 63, // needs localization
+  AT_SIGN: 64,
+  A: 65,
+  B: 66,
+  C: 67,
+  D: 68,
+  E: 69,
+  F: 70,
+  G: 71,
+  H: 72,
+  I: 73,
+  J: 74,
+  K: 75,
+  L: 76,
+  M: 77,
+  N: 78,
+  O: 79,
+  P: 80,
+  Q: 81,
+  R: 82,
+  S: 83,
+  T: 84,
+  U: 85,
+  V: 86,
+  W: 87,
+  X: 88,
+  Y: 89,
+  Z: 90,
+  META: 91, // WIN_KEY_LEFT
+  WIN_KEY_RIGHT: 92,
+  CONTEXT_MENU: 93,
+  NUM_ZERO: 96,
+  NUM_ONE: 97,
+  NUM_TWO: 98,
+  NUM_THREE: 99,
+  NUM_FOUR: 100,
+  NUM_FIVE: 101,
+  NUM_SIX: 102,
+  NUM_SEVEN: 103,
+  NUM_EIGHT: 104,
+  NUM_NINE: 105,
+  NUM_MULTIPLY: 106,
+  NUM_PLUS: 107,
+  NUM_MINUS: 109,
+  NUM_PERIOD: 110,
+  NUM_DIVISION: 111,
+  F1: 112,
+  F2: 113,
+  F3: 114,
+  F4: 115,
+  F5: 116,
+  F6: 117,
+  F7: 118,
+  F8: 119,
+  F9: 120,
+  F10: 121,
+  F11: 122,
+  F12: 123,
+  NUMLOCK: 144,
+  SCROLL_LOCK: 145,
+
+  // OS-specific media keys like volume controls and browser controls.
+  FIRST_MEDIA_KEY: 166,
+  LAST_MEDIA_KEY: 183,
+
+  SEMICOLON: 186,            // needs localization
+  DASH: 189,                 // needs localization
+  EQUALS: 187,               // needs localization
+  COMMA: 188,                // needs localization
+  PERIOD: 190,               // needs localization
+  SLASH: 191,                // needs localization
+  APOSTROPHE: 192,           // needs localization
+  TILDE: 192,                // needs localization
+  SINGLE_QUOTE: 222,         // needs localization
+  OPEN_SQUARE_BRACKET: 219,  // needs localization
+  BACKSLASH: 220,            // needs localization
+  CLOSE_SQUARE_BRACKET: 221, // needs localization
+  WIN_KEY: 224,
+  MAC_FF_META: 224, // Firefox (Gecko) fires this for the meta key instead of 91
+  MAC_WK_CMD_LEFT: 91,  // WebKit Left Command key fired, same as META
+  MAC_WK_CMD_RIGHT: 93, // WebKit Right Command key fired, different from META
+  WIN_IME: 229,
+
+  // "Reserved for future use". Some programs (e.g. the SlingPlayer 2.4 ActiveX
+  // control) fire this as a hacky way to disable screensavers.
+  VK_NONAME: 252,
+
+  // We've seen users whose machines fire this keycode at regular one
+  // second intervals. The common thread among these users is that
+  // they're all using Dell Inspiron laptops, so we suspect that this
+  // indicates a hardware/bios problem.
+  // http://en.community.dell.com/support-forums/laptop/f/3518/p/19285957/19523128.aspx
+  PHANTOM: 255
+};
+
+
+/**
+ * Returns true if the event contains a text modifying key.
+ * @param {goog.events.BrowserEvent} e A key event.
+ * @return {boolean} Whether it's a text modifying key.
+ */
+goog.events.KeyCodes.isTextModifyingKeyEvent = function(e) {
+  if (e.altKey && !e.ctrlKey ||
+      e.metaKey ||
+      // Function keys don't generate text
+      e.keyCode >= goog.events.KeyCodes.F1 &&
+      e.keyCode <= goog.events.KeyCodes.F12) {
+    return false;
+  }
+
+  // The following keys are quite harmless, even in combination with
+  // CTRL, ALT or SHIFT.
+  switch (e.keyCode) {
+    case goog.events.KeyCodes.ALT:
+    case goog.events.KeyCodes.CAPS_LOCK:
+    case goog.events.KeyCodes.CONTEXT_MENU:
+    case goog.events.KeyCodes.CTRL:
+    case goog.events.KeyCodes.DOWN:
+    case goog.events.KeyCodes.END:
+    case goog.events.KeyCodes.ESC:
+    case goog.events.KeyCodes.HOME:
+    case goog.events.KeyCodes.INSERT:
+    case goog.events.KeyCodes.LEFT:
+    case goog.events.KeyCodes.MAC_FF_META:
+    case goog.events.KeyCodes.META:
+    case goog.events.KeyCodes.NUMLOCK:
+    case goog.events.KeyCodes.NUM_CENTER:
+    case goog.events.KeyCodes.PAGE_DOWN:
+    case goog.events.KeyCodes.PAGE_UP:
+    case goog.events.KeyCodes.PAUSE:
+    case goog.events.KeyCodes.PHANTOM:
+    case goog.events.KeyCodes.PRINT_SCREEN:
+    case goog.events.KeyCodes.RIGHT:
+    case goog.events.KeyCodes.SCROLL_LOCK:
+    case goog.events.KeyCodes.SHIFT:
+    case goog.events.KeyCodes.UP:
+    case goog.events.KeyCodes.VK_NONAME:
+    case goog.events.KeyCodes.WIN_KEY:
+    case goog.events.KeyCodes.WIN_KEY_RIGHT:
+      return false;
+    case goog.events.KeyCodes.WIN_KEY_FF_LINUX:
+      return !goog.userAgent.GECKO;
+    default:
+      return e.keyCode < goog.events.KeyCodes.FIRST_MEDIA_KEY ||
+          e.keyCode > goog.events.KeyCodes.LAST_MEDIA_KEY;
+  }
+};
+
+
+/**
+ * Returns true if the key fires a keypress event in the current browser.
+ *
+ * Accoridng to MSDN [1] IE only fires keypress events for the following keys:
+ * - Letters: A - Z (uppercase and lowercase)
+ * - Numerals: 0 - 9
+ * - Symbols: ! @ # $ % ^ & * ( ) _ - + = < [ ] { } , . / ? \ | ' ` " ~
+ * - System: ESC, SPACEBAR, ENTER
+ *
+ * That's not entirely correct though, for instance there's no distinction
+ * between upper and lower case letters.
+ *
+ * [1] http://msdn2.microsoft.com/en-us/library/ms536939(VS.85).aspx)
+ *
+ * Safari is similar to IE, but does not fire keypress for ESC.
+ *
+ * Additionally, IE6 does not fire keydown or keypress events for letters when
+ * the control or alt keys are held down and the shift key is not. IE7 does
+ * fire keydown in these cases, though, but not keypress.
+ *
+ * @param {number} keyCode A key code.
+ * @param {number=} opt_heldKeyCode Key code of a currently-held key.
+ * @param {boolean=} opt_shiftKey Whether the shift key is held down.
+ * @param {boolean=} opt_ctrlKey Whether the control key is held down.
+ * @param {boolean=} opt_altKey Whether the alt key is held down.
+ * @return {boolean} Whether it's a key that fires a keypress event.
+ */
+goog.events.KeyCodes.firesKeyPressEvent = function(keyCode, opt_heldKeyCode,
+    opt_shiftKey, opt_ctrlKey, opt_altKey) {
+  if (!goog.userAgent.IE && !goog.userAgent.EDGE &&
+      !(goog.userAgent.WEBKIT && goog.userAgent.isVersionOrHigher('525'))) {
+    return true;
+  }
+
+  if (goog.userAgent.MAC && opt_altKey) {
+    return goog.events.KeyCodes.isCharacterKey(keyCode);
+  }
+
+  // Alt but not AltGr which is represented as Alt+Ctrl.
+  if (opt_altKey && !opt_ctrlKey) {
+    return false;
+  }
+
+  // Saves Ctrl or Alt + key for IE and WebKit 525+, which won't fire keypress.
+  // Non-IE browsers and WebKit prior to 525 won't get this far so no need to
+  // check the user agent.
+  if (goog.isNumber(opt_heldKeyCode)) {
+    opt_heldKeyCode = goog.events.KeyCodes.normalizeKeyCode(opt_heldKeyCode);
+  }
+  if (!opt_shiftKey &&
+      (opt_heldKeyCode == goog.events.KeyCodes.CTRL ||
+       opt_heldKeyCode == goog.events.KeyCodes.ALT ||
+       goog.userAgent.MAC &&
+       opt_heldKeyCode == goog.events.KeyCodes.META)) {
+    return false;
+  }
+
+  // Some keys with Ctrl/Shift do not issue keypress in WEBKIT.
+  if ((goog.userAgent.WEBKIT || goog.userAgent.EDGE) &&
+      opt_ctrlKey && opt_shiftKey) {
+    switch (keyCode) {
+      case goog.events.KeyCodes.BACKSLASH:
+      case goog.events.KeyCodes.OPEN_SQUARE_BRACKET:
+      case goog.events.KeyCodes.CLOSE_SQUARE_BRACKET:
+      case goog.events.KeyCodes.TILDE:
+      case goog.events.KeyCodes.SEMICOLON:
+      case goog.events.KeyCodes.DASH:
+      case goog.events.KeyCodes.EQUALS:
+      case goog.events.KeyCodes.COMMA:
+      case goog.events.KeyCodes.PERIOD:
+      case goog.events.KeyCodes.SLASH:
+      case goog.events.KeyCodes.APOSTROPHE:
+      case goog.events.KeyCodes.SINGLE_QUOTE:
+        return false;
+    }
+  }
+
+  // When Ctrl+<somekey> is held in IE, it only fires a keypress once, but it
+  // continues to fire keydown events as the event repeats.
+  if (goog.userAgent.IE && opt_ctrlKey && opt_heldKeyCode == keyCode) {
+    return false;
+  }
+
+  switch (keyCode) {
+    case goog.events.KeyCodes.ENTER:
+      return true;
+    case goog.events.KeyCodes.ESC:
+      return !(goog.userAgent.WEBKIT || goog.userAgent.EDGE);
+  }
+
+  return goog.events.KeyCodes.isCharacterKey(keyCode);
+};
+
+
+/**
+ * Returns true if the key produces a character.
+ * This does not cover characters on non-US keyboards (Russian, Hebrew, etc.).
+ *
+ * @param {number} keyCode A key code.
+ * @return {boolean} Whether it's a character key.
+ */
+goog.events.KeyCodes.isCharacterKey = function(keyCode) {
+  if (keyCode >= goog.events.KeyCodes.ZERO &&
+      keyCode <= goog.events.KeyCodes.NINE) {
+    return true;
+  }
+
+  if (keyCode >= goog.events.KeyCodes.NUM_ZERO &&
+      keyCode <= goog.events.KeyCodes.NUM_MULTIPLY) {
+    return true;
+  }
+
+  if (keyCode >= goog.events.KeyCodes.A &&
+      keyCode <= goog.events.KeyCodes.Z) {
+    return true;
+  }
+
+  // Safari sends zero key code for non-latin characters.
+  if ((goog.userAgent.WEBKIT || goog.userAgent.EDGE) && keyCode == 0) {
+    return true;
+  }
+
+  switch (keyCode) {
+    case goog.events.KeyCodes.SPACE:
+    case goog.events.KeyCodes.PLUS_SIGN:
+    case goog.events.KeyCodes.QUESTION_MARK:
+    case goog.events.KeyCodes.AT_SIGN:
+    case goog.events.KeyCodes.NUM_PLUS:
+    case goog.events.KeyCodes.NUM_MINUS:
+    case goog.events.KeyCodes.NUM_PERIOD:
+    case goog.events.KeyCodes.NUM_DIVISION:
+    case goog.events.KeyCodes.SEMICOLON:
+    case goog.events.KeyCodes.FF_SEMICOLON:
+    case goog.events.KeyCodes.DASH:
+    case goog.events.KeyCodes.EQUALS:
+    case goog.events.KeyCodes.FF_EQUALS:
+    case goog.events.KeyCodes.COMMA:
+    case goog.events.KeyCodes.PERIOD:
+    case goog.events.KeyCodes.SLASH:
+    case goog.events.KeyCodes.APOSTROPHE:
+    case goog.events.KeyCodes.SINGLE_QUOTE:
+    case goog.events.KeyCodes.OPEN_SQUARE_BRACKET:
+    case goog.events.KeyCodes.BACKSLASH:
+    case goog.events.KeyCodes.CLOSE_SQUARE_BRACKET:
+      return true;
+    default:
+      return false;
+  }
+};
+
+
+/**
+ * Normalizes key codes from OS/Browser-specific value to the general one.
+ * @param {number} keyCode The native key code.
+ * @return {number} The normalized key code.
+ */
+goog.events.KeyCodes.normalizeKeyCode = function(keyCode) {
+  if (goog.userAgent.GECKO) {
+    return goog.events.KeyCodes.normalizeGeckoKeyCode(keyCode);
+  } else if (goog.userAgent.MAC && goog.userAgent.WEBKIT) {
+    return goog.events.KeyCodes.normalizeMacWebKitKeyCode(keyCode);
+  } else {
+    return keyCode;
+  }
+};
+
+
+/**
+ * Normalizes key codes from their Gecko-specific value to the general one.
+ * @param {number} keyCode The native key code.
+ * @return {number} The normalized key code.
+ */
+goog.events.KeyCodes.normalizeGeckoKeyCode = function(keyCode) {
+  switch (keyCode) {
+    case goog.events.KeyCodes.FF_EQUALS:
+      return goog.events.KeyCodes.EQUALS;
+    case goog.events.KeyCodes.FF_SEMICOLON:
+      return goog.events.KeyCodes.SEMICOLON;
+    case goog.events.KeyCodes.FF_DASH:
+      return goog.events.KeyCodes.DASH;
+    case goog.events.KeyCodes.MAC_FF_META:
+      return goog.events.KeyCodes.META;
+    case goog.events.KeyCodes.WIN_KEY_FF_LINUX:
+      return goog.events.KeyCodes.WIN_KEY;
+    default:
+      return keyCode;
+  }
+};
+
+
+/**
+ * Normalizes key codes from their Mac WebKit-specific value to the general one.
+ * @param {number} keyCode The native key code.
+ * @return {number} The normalized key code.
+ */
+goog.events.KeyCodes.normalizeMacWebKitKeyCode = function(keyCode) {
+  switch (keyCode) {
+    case goog.events.KeyCodes.MAC_WK_CMD_RIGHT:  // 93
+      return goog.events.KeyCodes.META;          // 91
+    default:
+      return keyCode;
+  }
+};
+
+// Copyright 2007 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview This file contains a class for working with keyboard events
+ * that repeat consistently across browsers and platforms. It also unifies the
+ * key code so that it is the same in all browsers and platforms.
+ *
+ * Different web browsers have very different keyboard event handling. Most
+ * importantly is that only certain browsers repeat keydown events:
+ * IE, Opera, FF/Win32, and Safari 3 repeat keydown events.
+ * FF/Mac and Safari 2 do not.
+ *
+ * For the purposes of this code, "Safari 3" means WebKit 525+, when WebKit
+ * decided that they should try to match IE's key handling behavior.
+ * Safari 3.0.4, which shipped with Leopard (WebKit 523), has the
+ * Safari 2 behavior.
+ *
+ * Firefox, Safari, Opera prevent on keypress
+ *
+ * IE prevents on keydown
+ *
+ * Firefox does not fire keypress for shift, ctrl, alt
+ * Firefox does fire keydown for shift, ctrl, alt, meta
+ * Firefox does not repeat keydown for shift, ctrl, alt, meta
+ *
+ * Firefox does not fire keypress for up and down in an input
+ *
+ * Opera fires keypress for shift, ctrl, alt, meta
+ * Opera does not repeat keypress for shift, ctrl, alt, meta
+ *
+ * Safari 2 and 3 do not fire keypress for shift, ctrl, alt
+ * Safari 2 does not fire keydown for shift, ctrl, alt
+ * Safari 3 *does* fire keydown for shift, ctrl, alt
+ *
+ * IE provides the keycode for keyup/down events and the charcode (in the
+ * keycode field) for keypress.
+ *
+ * Mozilla provides the keycode for keyup/down and the charcode for keypress
+ * unless it's a non text modifying key in which case the keycode is provided.
+ *
+ * Safari 3 provides the keycode and charcode for all events.
+ *
+ * Opera provides the keycode for keyup/down event and either the charcode or
+ * the keycode (in the keycode field) for keypress events.
+ *
+ * Firefox x11 doesn't fire keydown events if a another key is already held down
+ * until the first key is released. This can cause a key event to be fired with
+ * a keyCode for the first key and a charCode for the second key.
+ *
+ * Safari in keypress
+ *
+ *        charCode keyCode which
+ * ENTER:       13      13    13
+ * F1:       63236   63236 63236
+ * F8:       63243   63243 63243
+ * ...
+ * p:          112     112   112
+ * P:           80      80    80
+ *
+ * Firefox, keypress:
+ *
+ *        charCode keyCode which
+ * ENTER:        0      13    13
+ * F1:           0     112     0
+ * F8:           0     119     0
+ * ...
+ * p:          112       0   112
+ * P:           80       0    80
+ *
+ * Opera, Mac+Win32, keypress:
+ *
+ *         charCode keyCode which
+ * ENTER: undefined      13    13
+ * F1:    undefined     112     0
+ * F8:    undefined     119     0
+ * ...
+ * p:     undefined     112   112
+ * P:     undefined      80    80
+ *
+ * IE7, keydown
+ *
+ *         charCode keyCode     which
+ * ENTER: undefined      13 undefined
+ * F1:    undefined     112 undefined
+ * F8:    undefined     119 undefined
+ * ...
+ * p:     undefined      80 undefined
+ * P:     undefined      80 undefined
+ *
+ * @author arv@google.com (Erik Arvidsson)
+ * @author eae@google.com (Emil A Eklund)
+ * @see ../demos/keyhandler.html
+ */
+
+goog.provide('goog.events.KeyEvent');
+goog.provide('goog.events.KeyHandler');
+goog.provide('goog.events.KeyHandler.EventType');
+
+goog.require('goog.events');
+goog.require('goog.events.BrowserEvent');
+goog.require('goog.events.EventTarget');
+goog.require('goog.events.EventType');
+goog.require('goog.events.KeyCodes');
+goog.require('goog.userAgent');
+
+
+
+/**
+ * A wrapper around an element that you want to listen to keyboard events on.
+ * @param {Element|Document=} opt_element The element or document to listen on.
+ * @param {boolean=} opt_capture Whether to listen for browser events in
+ *     capture phase (defaults to false).
+ * @constructor
+ * @extends {goog.events.EventTarget}
+ * @final
+ */
+goog.events.KeyHandler = function(opt_element, opt_capture) {
+  goog.events.EventTarget.call(this);
+
+  if (opt_element) {
+    this.attach(opt_element, opt_capture);
+  }
+};
+goog.inherits(goog.events.KeyHandler, goog.events.EventTarget);
+
+
+/**
+ * This is the element that we will listen to the real keyboard events on.
+ * @type {Element|Document|null}
+ * @private
+ */
+goog.events.KeyHandler.prototype.element_ = null;
+
+
+/**
+ * The key for the key press listener.
+ * @type {goog.events.Key}
+ * @private
+ */
+goog.events.KeyHandler.prototype.keyPressKey_ = null;
+
+
+/**
+ * The key for the key down listener.
+ * @type {goog.events.Key}
+ * @private
+ */
+goog.events.KeyHandler.prototype.keyDownKey_ = null;
+
+
+/**
+ * The key for the key up listener.
+ * @type {goog.events.Key}
+ * @private
+ */
+goog.events.KeyHandler.prototype.keyUpKey_ = null;
+
+
+/**
+ * Used to detect keyboard repeat events.
+ * @private
+ * @type {number}
+ */
+goog.events.KeyHandler.prototype.lastKey_ = -1;
+
+
+/**
+ * Keycode recorded for key down events. As most browsers don't report the
+ * keycode in the key press event we need to record it in the key down phase.
+ * @private
+ * @type {number}
+ */
+goog.events.KeyHandler.prototype.keyCode_ = -1;
+
+
+/**
+ * Alt key recorded for key down events. FF on Mac does not report the alt key
+ * flag in the key press event, we need to record it in the key down phase.
+ * @type {boolean}
+ * @private
+ */
+goog.events.KeyHandler.prototype.altKey_ = false;
+
+
+/**
+ * Enum type for the events fired by the key handler
+ * @enum {string}
+ */
+goog.events.KeyHandler.EventType = {
+  KEY: 'key'
+};
+
+
+/**
+ * An enumeration of key codes that Safari 2 does incorrectly
+ * @type {Object}
+ * @private
+ */
+goog.events.KeyHandler.safariKey_ = {
+  '3': goog.events.KeyCodes.ENTER, // 13
+  '12': goog.events.KeyCodes.NUMLOCK, // 144
+  '63232': goog.events.KeyCodes.UP, // 38
+  '63233': goog.events.KeyCodes.DOWN, // 40
+  '63234': goog.events.KeyCodes.LEFT, // 37
+  '63235': goog.events.KeyCodes.RIGHT, // 39
+  '63236': goog.events.KeyCodes.F1, // 112
+  '63237': goog.events.KeyCodes.F2, // 113
+  '63238': goog.events.KeyCodes.F3, // 114
+  '63239': goog.events.KeyCodes.F4, // 115
+  '63240': goog.events.KeyCodes.F5, // 116
+  '63241': goog.events.KeyCodes.F6, // 117
+  '63242': goog.events.KeyCodes.F7, // 118
+  '63243': goog.events.KeyCodes.F8, // 119
+  '63244': goog.events.KeyCodes.F9, // 120
+  '63245': goog.events.KeyCodes.F10, // 121
+  '63246': goog.events.KeyCodes.F11, // 122
+  '63247': goog.events.KeyCodes.F12, // 123
+  '63248': goog.events.KeyCodes.PRINT_SCREEN, // 44
+  '63272': goog.events.KeyCodes.DELETE, // 46
+  '63273': goog.events.KeyCodes.HOME, // 36
+  '63275': goog.events.KeyCodes.END, // 35
+  '63276': goog.events.KeyCodes.PAGE_UP, // 33
+  '63277': goog.events.KeyCodes.PAGE_DOWN, // 34
+  '63289': goog.events.KeyCodes.NUMLOCK, // 144
+  '63302': goog.events.KeyCodes.INSERT // 45
+};
+
+
+/**
+ * An enumeration of key identifiers currently part of the W3C draft for DOM3
+ * and their mappings to keyCodes.
+ * http://www.w3.org/TR/DOM-Level-3-Events/keyset.html#KeySet-Set
+ * This is currently supported in Safari and should be platform independent.
+ * @type {Object}
+ * @private
+ */
+goog.events.KeyHandler.keyIdentifier_ = {
+  'Up': goog.events.KeyCodes.UP, // 38
+  'Down': goog.events.KeyCodes.DOWN, // 40
+  'Left': goog.events.KeyCodes.LEFT, // 37
+  'Right': goog.events.KeyCodes.RIGHT, // 39
+  'Enter': goog.events.KeyCodes.ENTER, // 13
+  'F1': goog.events.KeyCodes.F1, // 112
+  'F2': goog.events.KeyCodes.F2, // 113
+  'F3': goog.events.KeyCodes.F3, // 114
+  'F4': goog.events.KeyCodes.F4, // 115
+  'F5': goog.events.KeyCodes.F5, // 116
+  'F6': goog.events.KeyCodes.F6, // 117
+  'F7': goog.events.KeyCodes.F7, // 118
+  'F8': goog.events.KeyCodes.F8, // 119
+  'F9': goog.events.KeyCodes.F9, // 120
+  'F10': goog.events.KeyCodes.F10, // 121
+  'F11': goog.events.KeyCodes.F11, // 122
+  'F12': goog.events.KeyCodes.F12, // 123
+  'U+007F': goog.events.KeyCodes.DELETE, // 46
+  'Home': goog.events.KeyCodes.HOME, // 36
+  'End': goog.events.KeyCodes.END, // 35
+  'PageUp': goog.events.KeyCodes.PAGE_UP, // 33
+  'PageDown': goog.events.KeyCodes.PAGE_DOWN, // 34
+  'Insert': goog.events.KeyCodes.INSERT // 45
+};
+
+
+/**
+ * If true, the KeyEvent fires on keydown. Otherwise, it fires on keypress.
+ *
+ * @type {boolean}
+ * @private
+ */
+goog.events.KeyHandler.USES_KEYDOWN_ = goog.userAgent.IE ||
+    goog.userAgent.EDGE ||
+    goog.userAgent.WEBKIT && goog.userAgent.isVersionOrHigher('525');
+
+
+/**
+ * If true, the alt key flag is saved during the key down and reused when
+ * handling the key press. FF on Mac does not set the alt flag in the key press
+ * event.
+ * @type {boolean}
+ * @private
+ */
+goog.events.KeyHandler.SAVE_ALT_FOR_KEYPRESS_ = goog.userAgent.MAC &&
+    goog.userAgent.GECKO;
+
+
+/**
+ * Records the keycode for browsers that only returns the keycode for key up/
+ * down events. For browser/key combinations that doesn't trigger a key pressed
+ * event it also fires the patched key event.
+ * @param {goog.events.BrowserEvent} e The key down event.
+ * @private
+ */
+goog.events.KeyHandler.prototype.handleKeyDown_ = function(e) {
+  // Ctrl-Tab and Alt-Tab can cause the focus to be moved to another window
+  // before we've caught a key-up event.  If the last-key was one of these we
+  // reset the state.
+  if (goog.userAgent.WEBKIT || goog.userAgent.EDGE) {
+    if (this.lastKey_ == goog.events.KeyCodes.CTRL && !e.ctrlKey ||
+        this.lastKey_ == goog.events.KeyCodes.ALT && !e.altKey ||
+        goog.userAgent.MAC &&
+        this.lastKey_ == goog.events.KeyCodes.META && !e.metaKey) {
+      this.resetState();
+    }
+  }
+
+  if (this.lastKey_ == -1) {
+    if (e.ctrlKey && e.keyCode != goog.events.KeyCodes.CTRL) {
+      this.lastKey_ = goog.events.KeyCodes.CTRL;
+    } else if (e.altKey && e.keyCode != goog.events.KeyCodes.ALT) {
+      this.lastKey_ = goog.events.KeyCodes.ALT;
+    } else if (e.metaKey && e.keyCode != goog.events.KeyCodes.META) {
+      this.lastKey_ = goog.events.KeyCodes.META;
+    }
+  }
+
+  if (goog.events.KeyHandler.USES_KEYDOWN_ &&
+      !goog.events.KeyCodes.firesKeyPressEvent(e.keyCode,
+          this.lastKey_, e.shiftKey, e.ctrlKey, e.altKey)) {
+    this.handleEvent(e);
+  } else {
+    this.keyCode_ = goog.events.KeyCodes.normalizeKeyCode(e.keyCode);
+    if (goog.events.KeyHandler.SAVE_ALT_FOR_KEYPRESS_) {
+      this.altKey_ = e.altKey;
+    }
+  }
+};
+
+
+/**
+ * Resets the stored previous values. Needed to be called for webkit which will
+ * not generate a key up for meta key operations. This should only be called
+ * when having finished with repeat key possiblities.
+ */
+goog.events.KeyHandler.prototype.resetState = function() {
+  this.lastKey_ = -1;
+  this.keyCode_ = -1;
+};
+
+
+/**
+ * Clears the stored previous key value, resetting the key repeat status. Uses
+ * -1 because the Safari 3 Windows beta reports 0 for certain keys (like Home
+ * and End.)
+ * @param {goog.events.BrowserEvent} e The keyup event.
+ * @private
+ */
+goog.events.KeyHandler.prototype.handleKeyup_ = function(e) {
+  this.resetState();
+  this.altKey_ = e.altKey;
+};
+
+
+/**
+ * Handles the events on the element.
+ * @param {goog.events.BrowserEvent} e  The keyboard event sent from the
+ *     browser.
+ */
+goog.events.KeyHandler.prototype.handleEvent = function(e) {
+  var be = e.getBrowserEvent();
+  var keyCode, charCode;
+  var altKey = be.altKey;
+
+  // IE reports the character code in the keyCode field for keypress events.
+  // There are two exceptions however, Enter and Escape.
+  if (goog.userAgent.IE && e.type == goog.events.EventType.KEYPRESS) {
+    keyCode = this.keyCode_;
+    charCode = keyCode != goog.events.KeyCodes.ENTER &&
+        keyCode != goog.events.KeyCodes.ESC ?
+            be.keyCode : 0;
+
+  // Safari reports the character code in the keyCode field for keypress
+  // events but also has a charCode field.
+  } else if ((goog.userAgent.WEBKIT || goog.userAgent.EDGE) &&
+      e.type == goog.events.EventType.KEYPRESS) {
+    keyCode = this.keyCode_;
+    charCode = be.charCode >= 0 && be.charCode < 63232 &&
+        goog.events.KeyCodes.isCharacterKey(keyCode) ?
+            be.charCode : 0;
+
+  // Opera reports the keycode or the character code in the keyCode field.
+  } else if (goog.userAgent.OPERA && !goog.userAgent.WEBKIT) {
+    keyCode = this.keyCode_;
+    charCode = goog.events.KeyCodes.isCharacterKey(keyCode) ?
+        be.keyCode : 0;
+
+  // Mozilla reports the character code in the charCode field.
+  } else {
+    keyCode = be.keyCode || this.keyCode_;
+    charCode = be.charCode || 0;
+    if (goog.events.KeyHandler.SAVE_ALT_FOR_KEYPRESS_) {
+      altKey = this.altKey_;
+    }
+    // On the Mac, shift-/ triggers a question mark char code and no key code
+    // (normalized to WIN_KEY), so we synthesize the latter.
+    if (goog.userAgent.MAC &&
+        charCode == goog.events.KeyCodes.QUESTION_MARK &&
+        keyCode == goog.events.KeyCodes.WIN_KEY) {
+      keyCode = goog.events.KeyCodes.SLASH;
+    }
+  }
+
+  keyCode = goog.events.KeyCodes.normalizeKeyCode(keyCode);
+  var key = keyCode;
+  var keyIdentifier = be.keyIdentifier;
+
+  // Correct the key value for certain browser-specific quirks.
+  if (keyCode) {
+    if (keyCode >= 63232 && keyCode in goog.events.KeyHandler.safariKey_) {
+      // NOTE(nicksantos): Safari 3 has fixed this problem,
+      // this is only needed for Safari 2.
+      key = goog.events.KeyHandler.safariKey_[keyCode];
+    } else {
+
+      // Safari returns 25 for Shift+Tab instead of 9.
+      if (keyCode == 25 && e.shiftKey) {
+        key = 9;
+      }
+    }
+  } else if (keyIdentifier &&
+             keyIdentifier in goog.events.KeyHandler.keyIdentifier_) {
+    // This is needed for Safari Windows because it currently doesn't give a
+    // keyCode/which for non printable keys.
+    key = goog.events.KeyHandler.keyIdentifier_[keyIdentifier];
+  }
+
+  // If we get the same keycode as a keydown/keypress without having seen a
+  // keyup event, then this event was caused by key repeat.
+  var repeat = key == this.lastKey_;
+  this.lastKey_ = key;
+
+  var event = new goog.events.KeyEvent(key, charCode, repeat, be);
+  event.altKey = altKey;
+  this.dispatchEvent(event);
+};
+
+
+/**
+ * Returns the element listened on for the real keyboard events.
+ * @return {Element|Document|null} The element listened on for the real
+ *     keyboard events.
+ */
+goog.events.KeyHandler.prototype.getElement = function() {
+  return this.element_;
+};
+
+
+/**
+ * Adds the proper key event listeners to the element.
+ * @param {Element|Document} element The element to listen on.
+ * @param {boolean=} opt_capture Whether to listen for browser events in
+ *     capture phase (defaults to false).
+ */
+goog.events.KeyHandler.prototype.attach = function(element, opt_capture) {
+  if (this.keyUpKey_) {
+    this.detach();
+  }
+
+  this.element_ = element;
+
+  this.keyPressKey_ = goog.events.listen(this.element_,
+                                         goog.events.EventType.KEYPRESS,
+                                         this,
+                                         opt_capture);
+
+  // Most browsers (Safari 2 being the notable exception) doesn't include the
+  // keyCode in keypress events (IE has the char code in the keyCode field and
+  // Mozilla only included the keyCode if there's no charCode). Thus we have to
+  // listen for keydown to capture the keycode.
+  this.keyDownKey_ = goog.events.listen(this.element_,
+                                        goog.events.EventType.KEYDOWN,
+                                        this.handleKeyDown_,
+                                        opt_capture,
+                                        this);
+
+
+  this.keyUpKey_ = goog.events.listen(this.element_,
+                                      goog.events.EventType.KEYUP,
+                                      this.handleKeyup_,
+                                      opt_capture,
+                                      this);
+};
+
+
+/**
+ * Removes the listeners that may exist.
+ */
+goog.events.KeyHandler.prototype.detach = function() {
+  if (this.keyPressKey_) {
+    goog.events.unlistenByKey(this.keyPressKey_);
+    goog.events.unlistenByKey(this.keyDownKey_);
+    goog.events.unlistenByKey(this.keyUpKey_);
+    this.keyPressKey_ = null;
+    this.keyDownKey_ = null;
+    this.keyUpKey_ = null;
+  }
+  this.element_ = null;
+  this.lastKey_ = -1;
+  this.keyCode_ = -1;
+};
+
+
+/** @override */
+goog.events.KeyHandler.prototype.disposeInternal = function() {
+  goog.events.KeyHandler.superClass_.disposeInternal.call(this);
+  this.detach();
+};
+
+
+
+/**
+ * This class is used for the goog.events.KeyHandler.EventType.KEY event and
+ * it overrides the key code with the fixed key code.
+ * @param {number} keyCode The adjusted key code.
+ * @param {number} charCode The unicode character code.
+ * @param {boolean} repeat Whether this event was generated by keyboard repeat.
+ * @param {Event} browserEvent Browser event object.
+ * @constructor
+ * @extends {goog.events.BrowserEvent}
+ * @final
+ */
+goog.events.KeyEvent = function(keyCode, charCode, repeat, browserEvent) {
+  goog.events.BrowserEvent.call(this, browserEvent);
+  this.type = goog.events.KeyHandler.EventType.KEY;
+
+  /**
+   * Keycode of key press.
+   * @type {number}
+   */
+  this.keyCode = keyCode;
+
+  /**
+   * Unicode character code.
+   * @type {number}
+   */
+  this.charCode = charCode;
+
+  /**
+   * True if this event was generated by keyboard auto-repeat (i.e., the user is
+   * holding the key down.)
+   * @type {boolean}
+   */
+  this.repeat = repeat;
+};
+goog.inherits(goog.events.KeyEvent, goog.events.BrowserEvent);
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview This event wrapper will dispatch an event when the user uses
+ * the mouse wheel to scroll an element. You can get the direction by checking
+ * the deltaX and deltaY properties of the event.
+ *
+ * This class aims to smooth out inconsistencies between browser platforms with
+ * regards to mousewheel events, but we do not cover every possible
+ * software/hardware combination out there, some of which occasionally produce
+ * very large deltas in mousewheel events. If your application wants to guard
+ * against extremely large deltas, use the setMaxDeltaX and setMaxDeltaY APIs
+ * to set maximum values that make sense for your application.
+ *
+ * @author arv@google.com (Erik Arvidsson)
+ * @see ../demos/mousewheelhandler.html
+ */
+
+goog.provide('goog.events.MouseWheelEvent');
+goog.provide('goog.events.MouseWheelHandler');
+goog.provide('goog.events.MouseWheelHandler.EventType');
+
+goog.require('goog.dom');
+goog.require('goog.events');
+goog.require('goog.events.BrowserEvent');
+goog.require('goog.events.EventTarget');
+goog.require('goog.math');
+goog.require('goog.style');
+goog.require('goog.userAgent');
+
+
+
+/**
+ * This event handler allows you to catch mouse wheel events in a consistent
+ * manner.
+ * @param {Element|Document} element The element to listen to the mouse wheel
+ *     event on.
+ * @param {boolean=} opt_capture Whether to handle the mouse wheel event in
+ *     capture phase.
+ * @constructor
+ * @extends {goog.events.EventTarget}
+ */
+goog.events.MouseWheelHandler = function(element, opt_capture) {
+  goog.events.EventTarget.call(this);
+
+  /**
+   * This is the element that we will listen to the real mouse wheel events on.
+   * @type {Element|Document}
+   * @private
+   */
+  this.element_ = element;
+
+  var rtlElement = goog.dom.isElement(this.element_) ?
+      /** @type {Element} */ (this.element_) :
+      (this.element_ ? /** @type {Document} */ (this.element_).body : null);
+
+  /**
+   * True if the element exists and is RTL, false otherwise.
+   * @type {boolean}
+   * @private
+   */
+  this.isRtl_ = !!rtlElement && goog.style.isRightToLeft(rtlElement);
+
+  var type = goog.userAgent.GECKO ? 'DOMMouseScroll' : 'mousewheel';
+
+  /**
+   * The key returned from the goog.events.listen.
+   * @type {goog.events.Key}
+   * @private
+   */
+  this.listenKey_ = goog.events.listen(this.element_, type, this, opt_capture);
+};
+goog.inherits(goog.events.MouseWheelHandler, goog.events.EventTarget);
+
+
+/**
+ * Enum type for the events fired by the mouse wheel handler.
+ * @enum {string}
+ */
+goog.events.MouseWheelHandler.EventType = {
+  MOUSEWHEEL: 'mousewheel'
+};
+
+
+/**
+ * Optional maximum magnitude for x delta on each mousewheel event.
+ * @type {number|undefined}
+ * @private
+ */
+goog.events.MouseWheelHandler.prototype.maxDeltaX_;
+
+
+/**
+ * Optional maximum magnitude for y delta on each mousewheel event.
+ * @type {number|undefined}
+ * @private
+ */
+goog.events.MouseWheelHandler.prototype.maxDeltaY_;
+
+
+/**
+ * @param {number} maxDeltaX Maximum magnitude for x delta on each mousewheel
+ *     event. Should be non-negative.
+ */
+goog.events.MouseWheelHandler.prototype.setMaxDeltaX = function(maxDeltaX) {
+  this.maxDeltaX_ = maxDeltaX;
+};
+
+
+/**
+ * @param {number} maxDeltaY Maximum magnitude for y delta on each mousewheel
+ *     event. Should be non-negative.
+ */
+goog.events.MouseWheelHandler.prototype.setMaxDeltaY = function(maxDeltaY) {
+  this.maxDeltaY_ = maxDeltaY;
+};
+
+
+/**
+ * Handles the events on the element.
+ * @param {goog.events.BrowserEvent} e The underlying browser event.
+ */
+goog.events.MouseWheelHandler.prototype.handleEvent = function(e) {
+  var deltaX = 0;
+  var deltaY = 0;
+  var detail = 0;
+  var be = e.getBrowserEvent();
+  if (be.type == 'mousewheel') {
+    var wheelDeltaScaleFactor = 1;
+    if (goog.userAgent.IE ||
+        goog.userAgent.WEBKIT &&
+        (goog.userAgent.WINDOWS || goog.userAgent.isVersionOrHigher('532.0'))) {
+      // In IE we get a multiple of 120; we adjust to a multiple of 3 to
+      // represent number of lines scrolled (like Gecko).
+      // Newer versions of Webkit match IE behavior, and WebKit on
+      // Windows also matches IE behavior.
+      // See bug https://bugs.webkit.org/show_bug.cgi?id=24368
+      wheelDeltaScaleFactor = 40;
+    }
+
+    detail = goog.events.MouseWheelHandler.smartScale_(
+        -be.wheelDelta, wheelDeltaScaleFactor);
+    if (goog.isDef(be.wheelDeltaX)) {
+      // Webkit has two properties to indicate directional scroll, and
+      // can scroll both directions at once.
+      deltaX = goog.events.MouseWheelHandler.smartScale_(
+          -be.wheelDeltaX, wheelDeltaScaleFactor);
+      deltaY = goog.events.MouseWheelHandler.smartScale_(
+          -be.wheelDeltaY, wheelDeltaScaleFactor);
+    } else {
+      deltaY = detail;
+    }
+
+    // Historical note: Opera (pre 9.5) used to negate the detail value.
+  } else { // Gecko
+    // Gecko returns multiple of 3 (representing the number of lines scrolled)
+    detail = be.detail;
+
+    // Gecko sometimes returns really big values if the user changes settings to
+    // scroll a whole page per scroll
+    if (detail > 100) {
+      detail = 3;
+    } else if (detail < -100) {
+      detail = -3;
+    }
+
+    // Firefox 3.1 adds an axis field to the event to indicate direction of
+    // scroll.  See https://developer.mozilla.org/en/Gecko-Specific_DOM_Events
+    if (goog.isDef(be.axis) && be.axis === be.HORIZONTAL_AXIS) {
+      deltaX = detail;
+    } else {
+      deltaY = detail;
+    }
+  }
+
+  if (goog.isNumber(this.maxDeltaX_)) {
+    deltaX = goog.math.clamp(deltaX, -this.maxDeltaX_, this.maxDeltaX_);
+  }
+  if (goog.isNumber(this.maxDeltaY_)) {
+    deltaY = goog.math.clamp(deltaY, -this.maxDeltaY_, this.maxDeltaY_);
+  }
+  // Don't clamp 'detail', since it could be ambiguous which axis it refers to
+  // and because it's informally deprecated anyways.
+
+  // For horizontal scrolling we need to flip the value for RTL grids.
+  if (this.isRtl_) {
+    deltaX = -deltaX;
+  }
+  var newEvent = new goog.events.MouseWheelEvent(detail, be, deltaX, deltaY);
+  this.dispatchEvent(newEvent);
+};
+
+
+/**
+ * Helper for scaling down a mousewheel delta by a scale factor, if appropriate.
+ * @param {number} mouseWheelDelta Delta from a mouse wheel event. Expected to
+ *     be an integer.
+ * @param {number} scaleFactor Factor to scale the delta down by. Expected to
+ *     be an integer.
+ * @return {number} Scaled-down delta value, or the original delta if the
+ *     scaleFactor does not appear to be applicable.
+ * @private
+ */
+goog.events.MouseWheelHandler.smartScale_ = function(mouseWheelDelta,
+    scaleFactor) {
+  // The basic problem here is that in Webkit on Mac and Linux, we can get two
+  // very different types of mousewheel events: from continuous devices
+  // (touchpads, Mighty Mouse) or non-continuous devices (normal wheel mice).
+  //
+  // Non-continuous devices in Webkit get their wheel deltas scaled up to
+  // behave like IE. Continuous devices return much smaller unscaled values
+  // (which most of the time will not be cleanly divisible by the IE scale
+  // factor), so we should not try to normalize them down.
+  //
+  // Detailed discussion:
+  //   https://bugs.webkit.org/show_bug.cgi?id=29601
+  //   http://trac.webkit.org/browser/trunk/WebKit/chromium/src/mac/WebInputEventFactory.mm#L1063
+  if (goog.userAgent.WEBKIT &&
+      (goog.userAgent.MAC || goog.userAgent.LINUX) &&
+      (mouseWheelDelta % scaleFactor) != 0) {
+    return mouseWheelDelta;
+  } else {
+    return mouseWheelDelta / scaleFactor;
+  }
+};
+
+
+/** @override */
+goog.events.MouseWheelHandler.prototype.disposeInternal = function() {
+  goog.events.MouseWheelHandler.superClass_.disposeInternal.call(this);
+  goog.events.unlistenByKey(this.listenKey_);
+  this.listenKey_ = null;
+};
+
+
+
+/**
+ * A base class for mouse wheel events. This is used with the
+ * MouseWheelHandler.
+ *
+ * @param {number} detail The number of rows the user scrolled.
+ * @param {Event} browserEvent Browser event object.
+ * @param {number} deltaX The number of rows the user scrolled in the X
+ *     direction.
+ * @param {number} deltaY The number of rows the user scrolled in the Y
+ *     direction.
+ * @constructor
+ * @extends {goog.events.BrowserEvent}
+ * @final
+ */
+goog.events.MouseWheelEvent = function(detail, browserEvent, deltaX, deltaY) {
+  goog.events.BrowserEvent.call(this, browserEvent);
+
+  this.type = goog.events.MouseWheelHandler.EventType.MOUSEWHEEL;
+
+  /**
+   * The number of lines the user scrolled
+   * @type {number}
+   * NOTE: Informally deprecated. Use deltaX and deltaY instead, they provide
+   * more information.
+   */
+  this.detail = detail;
+
+  /**
+   * The number of "lines" scrolled in the X direction.
+   *
+   * Note that not all browsers provide enough information to distinguish
+   * horizontal and vertical scroll events, so for these unsupported browsers,
+   * we will always have a deltaX of 0, even if the user scrolled their mouse
+   * wheel or trackpad sideways.
+   *
+   * Currently supported browsers are Webkit and Firefox 3.1 or later.
+   *
+   * @type {number}
+   */
+  this.deltaX = deltaX;
+
+  /**
+   * The number of lines scrolled in the Y direction.
+   * @type {number}
+   */
+  this.deltaY = deltaY;
+};
+goog.inherits(goog.events.MouseWheelEvent, goog.events.BrowserEvent);
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Basic strippable logging definitions.
+ * @see http://go/closurelogging
+ *
+ * @author johnlenz@google.com (John Lenz)
+ */
+
+goog.provide('goog.log');
+goog.provide('goog.log.Level');
+goog.provide('goog.log.LogRecord');
+goog.provide('goog.log.Logger');
+
+goog.require('goog.debug');
+goog.require('goog.debug.LogManager');
+goog.require('goog.debug.LogRecord');
+goog.require('goog.debug.Logger');
+
+
+/** @define {boolean} Whether logging is enabled. */
+goog.define('goog.log.ENABLED', goog.debug.LOGGING_ENABLED);
+
+
+/** @const */
+goog.log.ROOT_LOGGER_NAME = goog.debug.Logger.ROOT_LOGGER_NAME;
+
+
+
+/**
+ * @constructor
+ * @final
+ */
+goog.log.Logger = goog.debug.Logger;
+
+
+
+/**
+ * @constructor
+ * @final
+ */
+goog.log.Level = goog.debug.Logger.Level;
+
+
+
+/**
+ * @constructor
+ * @final
+ */
+goog.log.LogRecord = goog.debug.LogRecord;
+
+
+/**
+ * Finds or creates a logger for a named subsystem. If a logger has already been
+ * created with the given name it is returned. Otherwise a new logger is
+ * created. If a new logger is created its log level will be configured based
+ * on the goog.debug.LogManager configuration and it will configured to also
+ * send logging output to its parent's handlers.
+ * @see goog.debug.LogManager
+ *
+ * @param {string} name A name for the logger. This should be a dot-separated
+ *     name and should normally be based on the package name or class name of
+ *     the subsystem, such as goog.net.BrowserChannel.
+ * @param {goog.log.Level=} opt_level If provided, override the
+ *     default logging level with the provided level.
+ * @return {goog.log.Logger} The named logger or null if logging is disabled.
+ */
+goog.log.getLogger = function(name, opt_level) {
+  if (goog.log.ENABLED) {
+    var logger = goog.debug.LogManager.getLogger(name);
+    if (opt_level && logger) {
+      logger.setLevel(opt_level);
+    }
+    return logger;
+  } else {
+    return null;
+  }
+};
+
+
+// TODO(johnlenz): try to tighten the types to these functions.
+/**
+ * Adds a handler to the logger. This doesn't use the event system because
+ * we want to be able to add logging to the event system.
+ * @param {goog.log.Logger} logger
+ * @param {Function} handler Handler function to add.
+ */
+goog.log.addHandler = function(logger, handler) {
+  if (goog.log.ENABLED && logger) {
+    logger.addHandler(handler);
+  }
+};
+
+
+/**
+ * Removes a handler from the logger. This doesn't use the event system because
+ * we want to be able to add logging to the event system.
+ * @param {goog.log.Logger} logger
+ * @param {Function} handler Handler function to remove.
+ * @return {boolean} Whether the handler was removed.
+ */
+goog.log.removeHandler = function(logger, handler) {
+  if (goog.log.ENABLED && logger) {
+    return logger.removeHandler(handler);
+  } else {
+    return false;
+  }
+};
+
+
+/**
+ * Logs a message. If the logger is currently enabled for the
+ * given message level then the given message is forwarded to all the
+ * registered output Handler objects.
+ * @param {goog.log.Logger} logger
+ * @param {goog.log.Level} level One of the level identifiers.
+ * @param {goog.debug.Loggable} msg The message to log.
+ * @param {Error|Object=} opt_exception An exception associated with the
+ *     message.
+ */
+goog.log.log = function(logger, level, msg, opt_exception) {
+  if (goog.log.ENABLED && logger) {
+    logger.log(level, msg, opt_exception);
+  }
+};
+
+
+/**
+ * Logs a message at the Level.SEVERE level.
+ * If the logger is currently enabled for the given message level then the
+ * given message is forwarded to all the registered output Handler objects.
+ * @param {goog.log.Logger} logger
+ * @param {goog.debug.Loggable} msg The message to log.
+ * @param {Error=} opt_exception An exception associated with the message.
+ */
+goog.log.error = function(logger, msg, opt_exception) {
+  if (goog.log.ENABLED && logger) {
+    logger.severe(msg, opt_exception);
+  }
+};
+
+
+/**
+ * Logs a message at the Level.WARNING level.
+ * If the logger is currently enabled for the given message level then the
+ * given message is forwarded to all the registered output Handler objects.
+ * @param {goog.log.Logger} logger
+ * @param {goog.debug.Loggable} msg The message to log.
+ * @param {Error=} opt_exception An exception associated with the message.
+ */
+goog.log.warning = function(logger, msg, opt_exception) {
+  if (goog.log.ENABLED && logger) {
+    logger.warning(msg, opt_exception);
+  }
+};
+
+
+/**
+ * Logs a message at the Level.INFO level.
+ * If the logger is currently enabled for the given message level then the
+ * given message is forwarded to all the registered output Handler objects.
+ * @param {goog.log.Logger} logger
+ * @param {goog.debug.Loggable} msg The message to log.
+ * @param {Error=} opt_exception An exception associated with the message.
+ */
+goog.log.info = function(logger, msg, opt_exception) {
+  if (goog.log.ENABLED && logger) {
+    logger.info(msg, opt_exception);
+  }
+};
+
+
+/**
+ * Logs a message at the Level.Fine level.
+ * If the logger is currently enabled for the given message level then the
+ * given message is forwarded to all the registered output Handler objects.
+ * @param {goog.log.Logger} logger
+ * @param {goog.debug.Loggable} msg The message to log.
+ * @param {Error=} opt_exception An exception associated with the message.
+ */
+goog.log.fine = function(logger, msg, opt_exception) {
+  if (goog.log.ENABLED && logger) {
+    logger.fine(msg, opt_exception);
+  }
+};
+
+// Based on https://github.com/Polymer/PointerEvents
+
+// Copyright (c) 2013 The Polymer Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+goog.provide('ol.pointer.PointerEvent');
+
+
+goog.require('goog.events');
+goog.require('goog.events.Event');
+
+
+
+/**
+ * A class for pointer events.
+ *
+ * This class is used as an abstraction for mouse events,
+ * touch events and even native pointer events.
+ *
+ * @constructor
+ * @extends {goog.events.Event}
+ * @param {string} type The type of the event to create.
+ * @param {goog.events.BrowserEvent} browserEvent
+ * @param {Object.<string, ?>=} opt_eventDict An optional dictionary of
+ *    initial event properties.
+ */
+ol.pointer.PointerEvent = function(type, browserEvent, opt_eventDict) {
+  goog.base(this, type);
+
+  /**
+   * @const
+   * @type {goog.events.BrowserEvent}
+   */
+  this.browserEvent = browserEvent;
+
+  var eventDict = opt_eventDict ? opt_eventDict : {};
+
+  /**
+   * @type {number}
+   */
+  this.buttons = this.getButtons_(eventDict);
+
+  /**
+   * @type {number}
+   */
+  this.pressure = this.getPressure_(eventDict, this.buttons);
+
+  // MouseEvent related properties
+
+  /**
+   * @type {boolean}
+   */
+  this.bubbles = 'bubbles' in eventDict ? eventDict['bubbles'] : false;
+
+  /**
+   * @type {boolean}
+   */
+  this.cancelable = 'cancelable' in eventDict ? eventDict['cancelable'] : false;
+
+  /**
+   * @type {Object}
+   */
+  this.view = 'view' in eventDict ? eventDict['view'] : null;
+
+  /**
+   * @type {number}
+   */
+  this.detail = 'detail' in eventDict ? eventDict['detail'] : null;
+
+  /**
+   * @type {number}
+   */
+  this.screenX = 'screenX' in eventDict ? eventDict['screenX'] : 0;
+
+  /**
+   * @type {number}
+   */
+  this.screenY = 'screenY' in eventDict ? eventDict['screenY'] : 0;
+
+  /**
+   * @type {number}
+   */
+  this.clientX = 'clientX' in eventDict ? eventDict['clientX'] : 0;
+
+  /**
+   * @type {number}
+   */
+  this.clientY = 'clientY' in eventDict ? eventDict['clientY'] : 0;
+
+  /**
+   * @type {boolean}
+   */
+  this.ctrlKey = 'ctrlKey' in eventDict ? eventDict['ctrlKey'] : false;
+
+  /**
+   * @type {boolean}
+   */
+  this.altKey = 'altKey' in eventDict ? eventDict['altKey'] : false;
+
+  /**
+   * @type {boolean}
+   */
+  this.shiftKey = 'shiftKey' in eventDict ? eventDict['shiftKey'] : false;
+
+  /**
+   * @type {boolean}
+   */
+  this.metaKey = 'metaKey' in eventDict ? eventDict['metaKey'] : false;
+
+  /**
+   * @type {number}
+   */
+  this.button = 'button' in eventDict ? eventDict['button'] : 0;
+
+  /**
+   * @type {Node}
+   */
+  this.relatedTarget = 'relatedTarget' in eventDict ?
+      eventDict['relatedTarget'] : null;
+
+  // PointerEvent related properties
+
+  /**
+   * @const
+   * @type {number}
+   */
+  this.pointerId = 'pointerId' in eventDict ? eventDict['pointerId'] : 0;
+
+  /**
+   * @type {number}
+   */
+  this.width = 'width' in eventDict ? eventDict['width'] : 0;
+
+  /**
+   * @type {number}
+   */
+  this.height = 'height' in eventDict ? eventDict['height'] : 0;
+
+  /**
+   * @type {number}
+   */
+  this.tiltX = 'tiltX' in eventDict ? eventDict['tiltX'] : 0;
+
+  /**
+   * @type {number}
+   */
+  this.tiltY = 'tiltY' in eventDict ? eventDict['tiltY'] : 0;
+
+  /**
+   * @type {string}
+   */
+  this.pointerType = 'pointerType' in eventDict ? eventDict['pointerType'] : '';
+
+  /**
+   * @type {number}
+   */
+  this.hwTimestamp = 'hwTimestamp' in eventDict ? eventDict['hwTimestamp'] : 0;
+
+  /**
+   * @type {boolean}
+   */
+  this.isPrimary = 'isPrimary' in eventDict ? eventDict['isPrimary'] : false;
+
+  // keep the semantics of preventDefault
+  if (browserEvent.preventDefault) {
+    this.preventDefault = function() {
+      browserEvent.preventDefault();
+    };
+  }
+};
+goog.inherits(ol.pointer.PointerEvent, goog.events.Event);
+
+
+/**
+ * @private
+ * @param {Object.<string, ?>} eventDict
+ * @return {number}
+ */
+ol.pointer.PointerEvent.prototype.getButtons_ = function(eventDict) {
+  // According to the w3c spec,
+  // http://www.w3.org/TR/DOM-Level-3-Events/#events-MouseEvent-button
+  // MouseEvent.button == 0 can mean either no mouse button depressed, or the
+  // left mouse button depressed.
+  //
+  // As of now, the only way to distinguish between the two states of
+  // MouseEvent.button is by using the deprecated MouseEvent.which property, as
+  // this maps mouse buttons to positive integers > 0, and uses 0 to mean that
+  // no mouse button is held.
+  //
+  // MouseEvent.which is derived from MouseEvent.button at MouseEvent creation,
+  // but initMouseEvent does not expose an argument with which to set
+  // MouseEvent.which. Calling initMouseEvent with a buttonArg of 0 will set
+  // MouseEvent.button == 0 and MouseEvent.which == 1, breaking the expectations
+  // of app developers.
+  //
+  // The only way to propagate the correct state of MouseEvent.which and
+  // MouseEvent.button to a new MouseEvent.button == 0 and MouseEvent.which == 0
+  // is to call initMouseEvent with a buttonArg value of -1.
+  //
+  // This is fixed with DOM Level 4's use of buttons
+  var buttons;
+  if (eventDict.buttons || ol.pointer.PointerEvent.HAS_BUTTONS) {
+    buttons = eventDict.buttons;
+  } else {
+    switch (eventDict.which) {
+      case 1: buttons = 1; break;
+      case 2: buttons = 4; break;
+      case 3: buttons = 2; break;
+      default: buttons = 0;
+    }
+  }
+  return buttons;
+};
+
+
+/**
+ * @private
+ * @param {Object.<string, ?>} eventDict
+ * @param {number} buttons
+ * @return {number}
+ */
+ol.pointer.PointerEvent.prototype.getPressure_ = function(eventDict, buttons) {
+  // Spec requires that pointers without pressure specified use 0.5 for down
+  // state and 0 for up state.
+  var pressure = 0;
+  if (eventDict.pressure) {
+    pressure = eventDict.pressure;
+  } else {
+    pressure = buttons ? 0.5 : 0;
+  }
+  return pressure;
+};
+
+
+/**
+ * Is the `buttons` property supported?
+ * @type {boolean}
+ */
+ol.pointer.PointerEvent.HAS_BUTTONS = false;
+
+
+/**
+ * Checks if the `buttons` property is supported.
+ */
+(function() {
+  try {
+    var ev = new MouseEvent('click', {buttons: 1});
+    ol.pointer.PointerEvent.HAS_BUTTONS = ev.buttons === 1;
+  } catch (e) {
+  }
+})();
+
+// FIXME add tests for browser features (Modernizr?)
+
+goog.provide('ol.dom');
+goog.provide('ol.dom.BrowserFeature');
+
+goog.require('goog.asserts');
+goog.require('goog.dom');
+goog.require('goog.userAgent');
+goog.require('goog.vec.Mat4');
+goog.require('ol');
+
+
+/**
+ * Create an html canvas element and returns its 2d context.
+ * @param {number=} opt_width Canvas width.
+ * @param {number=} opt_height Canvas height.
+ * @return {CanvasRenderingContext2D}
+ */
+ol.dom.createCanvasContext2D = function(opt_width, opt_height) {
+  var canvas = document.createElement('CANVAS');
+  if (opt_width) {
+    canvas.width = opt_width;
+  }
+  if (opt_height) {
+    canvas.height = opt_height;
+  }
+  return canvas.getContext('2d');
+};
+
+
+/**
+ * Detect 2d transform.
+ * Adapted from http://stackoverflow.com/q/5661671/130442
+ * http://caniuse.com/#feat=transforms2d
+ * @return {boolean}
+ */
+ol.dom.canUseCssTransform = (function() {
+  var canUseCssTransform;
+  return function() {
+    if (canUseCssTransform === undefined) {
+      goog.asserts.assert(document.body,
+          'document.body should not be null');
+      if (!goog.global.getComputedStyle) {
+        // this browser is ancient
+        canUseCssTransform = false;
+      } else {
+        var el = document.createElement('P'),
+            has2d,
+            transforms = {
+              'webkitTransform': '-webkit-transform',
+              'OTransform': '-o-transform',
+              'msTransform': '-ms-transform',
+              'MozTransform': '-moz-transform',
+              'transform': 'transform'
+            };
+        document.body.appendChild(el);
+        for (var t in transforms) {
+          if (t in el.style) {
+            el.style[t] = 'translate(1px,1px)';
+            has2d = goog.global.getComputedStyle(el).getPropertyValue(
+                transforms[t]);
+          }
+        }
+        goog.dom.removeNode(el);
+
+        canUseCssTransform = (has2d && has2d !== 'none');
+      }
+    }
+    return canUseCssTransform;
+  };
+}());
+
+
+/**
+ * Detect 3d transform.
+ * Adapted from http://stackoverflow.com/q/5661671/130442
+ * http://caniuse.com/#feat=transforms3d
+ * @return {boolean}
+ */
+ol.dom.canUseCssTransform3D = (function() {
+  var canUseCssTransform3D;
+  return function() {
+    if (canUseCssTransform3D === undefined) {
+      goog.asserts.assert(document.body,
+          'document.body should not be null');
+      if (!goog.global.getComputedStyle) {
+        // this browser is ancient
+        canUseCssTransform3D = false;
+      } else {
+        var el = document.createElement('P'),
+            has3d,
+            transforms = {
+              'webkitTransform': '-webkit-transform',
+              'OTransform': '-o-transform',
+              'msTransform': '-ms-transform',
+              'MozTransform': '-moz-transform',
+              'transform': 'transform'
+            };
+        document.body.appendChild(el);
+        for (var t in transforms) {
+          if (t in el.style) {
+            el.style[t] = 'translate3d(1px,1px,1px)';
+            has3d = goog.global.getComputedStyle(el).getPropertyValue(
+                transforms[t]);
+          }
+        }
+        goog.dom.removeNode(el);
+
+        canUseCssTransform3D = (has3d && has3d !== 'none');
+      }
+    }
+    return canUseCssTransform3D;
+  };
+}());
+
+
+/**
+ * @param {Element} element Element.
+ * @param {string} value Value.
+ */
+ol.dom.setTransform = function(element, value) {
+  var style = element.style;
+  style.WebkitTransform = value;
+  style.MozTransform = value;
+  style.OTransform = value;
+  style.msTransform = value;
+  style.transform = value;
+
+  // IE 9+ seems to assume transform-origin: 100% 100%; for some unknown reason
+  if (goog.userAgent.IE && goog.userAgent.isVersionOrHigher('9.0')) {
+    element.style.transformOrigin = '0 0';
+  }
+};
+
+
+/**
+ * @param {!Element} element Element.
+ * @param {goog.vec.Mat4.Number} transform Matrix.
+ * @param {number=} opt_precision Precision.
+ */
+ol.dom.transformElement2D = function(element, transform, opt_precision) {
+  // using matrix() causes gaps in Chrome and Firefox on Mac OS X, so prefer
+  // matrix3d()
+  var i;
+  if (ol.dom.canUseCssTransform3D()) {
+    var value3D;
+
+    if (opt_precision !== undefined) {
+      /** @type {Array.<string>} */
+      var strings3D = new Array(16);
+      for (i = 0; i < 16; ++i) {
+        strings3D[i] = transform[i].toFixed(opt_precision);
+      }
+      value3D = strings3D.join(',');
+    } else {
+      value3D = transform.join(',');
+    }
+    ol.dom.setTransform(element, 'matrix3d(' + value3D + ')');
+  } else if (ol.dom.canUseCssTransform()) {
+    /** @type {Array.<number>} */
+    var transform2D = [
+      goog.vec.Mat4.getElement(transform, 0, 0),
+      goog.vec.Mat4.getElement(transform, 1, 0),
+      goog.vec.Mat4.getElement(transform, 0, 1),
+      goog.vec.Mat4.getElement(transform, 1, 1),
+      goog.vec.Mat4.getElement(transform, 0, 3),
+      goog.vec.Mat4.getElement(transform, 1, 3)
+    ];
+    var value2D;
+    if (opt_precision !== undefined) {
+      /** @type {Array.<string>} */
+      var strings2D = new Array(6);
+      for (i = 0; i < 6; ++i) {
+        strings2D[i] = transform2D[i].toFixed(opt_precision);
+      }
+      value2D = strings2D.join(',');
+    } else {
+      value2D = transform2D.join(',');
+    }
+    ol.dom.setTransform(element, 'matrix(' + value2D + ')');
+  } else {
+    element.style.left =
+        Math.round(goog.vec.Mat4.getElement(transform, 0, 3)) + 'px';
+    element.style.top =
+        Math.round(goog.vec.Mat4.getElement(transform, 1, 3)) + 'px';
+
+    // TODO: Add scaling here. This isn't quite as simple as multiplying
+    // width/height, because that only changes the container size, not the
+    // content size.
+  }
+};
+
+
+/**
+ * Get the current computed width for the given element including margin,
+ * padding and border.
+ * Equivalent to jQuery's `$(el).outerWidth(true)`.
+ * @param {!Element} element Element.
+ * @return {number}
+ */
+ol.dom.outerWidth = function(element) {
+  var width = element.offsetWidth;
+  var style = element.currentStyle || window.getComputedStyle(element);
+  width += parseInt(style.marginLeft, 10) + parseInt(style.marginRight, 10);
+
+  return width;
+};
+
+
+/**
+ * Get the current computed height for the given element including margin,
+ * padding and border.
+ * Equivalent to jQuery's `$(el).outerHeight(true)`.
+ * @param {!Element} element Element.
+ * @return {number}
+ */
+ol.dom.outerHeight = function(element) {
+  var height = element.offsetHeight;
+  var style = element.currentStyle || window.getComputedStyle(element);
+  height += parseInt(style.marginTop, 10) + parseInt(style.marginBottom, 10);
+
+  return height;
+};
+
+goog.provide('ol.webgl');
+goog.provide('ol.webgl.WebGLContextEventType');
+
+
+/**
+ * @const
+ * @private
+ * @type {Array.<string>}
+ */
+ol.webgl.CONTEXT_IDS_ = [
+  'experimental-webgl',
+  'webgl',
+  'webkit-3d',
+  'moz-webgl'
+];
+
+
+/**
+ * @enum {string}
+ */
+ol.webgl.WebGLContextEventType = {
+  LOST: 'webglcontextlost',
+  RESTORED: 'webglcontextrestored'
+};
+
+
+/**
+ * @param {HTMLCanvasElement} canvas Canvas.
+ * @param {Object=} opt_attributes Attributes.
+ * @return {WebGLRenderingContext} WebGL rendering context.
+ */
+ol.webgl.getContext = function(canvas, opt_attributes) {
+  var context, i, ii = ol.webgl.CONTEXT_IDS_.length;
+  for (i = 0; i < ii; ++i) {
+    try {
+      context = canvas.getContext(ol.webgl.CONTEXT_IDS_[i], opt_attributes);
+      if (context) {
+        return /** @type {!WebGLRenderingContext} */ (context);
+      }
+    } catch (e) {
+    }
+  }
+  return null;
+};
+
+goog.provide('ol.has');
+
+goog.require('ol');
+goog.require('ol.dom');
+goog.require('ol.webgl');
+
+
+/**
+ * The ratio between physical pixels and device-independent pixels
+ * (dips) on the device (`window.devicePixelRatio`).
+ * @const
+ * @type {number}
+ * @api stable
+ */
+ol.has.DEVICE_PIXEL_RATIO = goog.global.devicePixelRatio || 1;
+
+
+/**
+ * True if the browser's Canvas implementation implements {get,set}LineDash.
+ * @type {boolean}
+ */
+ol.has.CANVAS_LINE_DASH = false;
+
+
+/**
+ * True if both the library and browser support Canvas.  Always `false`
+ * if `ol.ENABLE_CANVAS` is set to `false` at compile time.
+ * @const
+ * @type {boolean}
+ * @api stable
+ */
+ol.has.CANVAS = ol.ENABLE_CANVAS && (
+    /**
+     * @return {boolean} Canvas supported.
+     */
+    function() {
+      if (!('HTMLCanvasElement' in goog.global)) {
+        return false;
+      }
+      try {
+        var context = ol.dom.createCanvasContext2D();
+        if (!context) {
+          return false;
+        } else {
+          if (context.setLineDash !== undefined) {
+            ol.has.CANVAS_LINE_DASH = true;
+          }
+          return true;
+        }
+      } catch (e) {
+        return false;
+      }
+    })();
+
+
+/**
+ * Indicates if DeviceOrientation is supported in the user's browser.
+ * @const
+ * @type {boolean}
+ * @api stable
+ */
+ol.has.DEVICE_ORIENTATION = 'DeviceOrientationEvent' in goog.global;
+
+
+/**
+ * True if `ol.ENABLE_DOM` is set to `true` at compile time.
+ * @const
+ * @type {boolean}
+ */
+ol.has.DOM = ol.ENABLE_DOM;
+
+
+/**
+ * Is HTML5 geolocation supported in the current browser?
+ * @const
+ * @type {boolean}
+ * @api stable
+ */
+ol.has.GEOLOCATION = 'geolocation' in goog.global.navigator;
+
+
+/**
+ * True if browser supports touch events.
+ * @const
+ * @type {boolean}
+ * @api stable
+ */
+ol.has.TOUCH = ol.ASSUME_TOUCH || 'ontouchstart' in goog.global;
+
+
+/**
+ * True if browser supports pointer events.
+ * @const
+ * @type {boolean}
+ */
+ol.has.POINTER = 'PointerEvent' in goog.global;
+
+
+/**
+ * True if browser supports ms pointer events (IE 10).
+ * @const
+ * @type {boolean}
+ */
+ol.has.MSPOINTER = !!(goog.global.navigator.msPointerEnabled);
+
+
+/**
+ * True if both OpenLayers and browser support WebGL.  Always `false`
+ * if `ol.ENABLE_WEBGL` is set to `false` at compile time.
+ * @const
+ * @type {boolean}
+ * @api stable
+ */
+ol.has.WEBGL;
+
+
+(function() {
+  if (ol.ENABLE_WEBGL) {
+    var hasWebGL = false;
+    var textureSize;
+    var /** @type {Array.<string>} */ extensions = [];
+
+    if ('WebGLRenderingContext' in goog.global) {
+      try {
+        var canvas = /** @type {HTMLCanvasElement} */
+            (document.createElement('CANVAS'));
+        var gl = ol.webgl.getContext(canvas, {
+          failIfMajorPerformanceCaveat: true
+        });
+        if (gl) {
+          hasWebGL = true;
+          textureSize = /** @type {number} */
+              (gl.getParameter(gl.MAX_TEXTURE_SIZE));
+          extensions = gl.getSupportedExtensions();
+        }
+      } catch (e) {}
+    }
+    ol.has.WEBGL = hasWebGL;
+    ol.WEBGL_EXTENSIONS = extensions;
+    ol.WEBGL_MAX_TEXTURE_SIZE = textureSize;
+  }
+})();
+
+goog.provide('ol.pointer.EventSource');
+
+goog.require('goog.events.BrowserEvent');
+
+
+
+/**
+ * @param {ol.pointer.PointerEventHandler} dispatcher
+ * @param {!Object.<string, function(goog.events.BrowserEvent)>} mapping
+ * @constructor
+ */
+ol.pointer.EventSource = function(dispatcher, mapping) {
+  /**
+   * @type {ol.pointer.PointerEventHandler}
+   */
+  this.dispatcher = dispatcher;
+
+  /**
+   * @private
+   * @const
+   * @type {!Object.<string, function(goog.events.BrowserEvent)>}
+   */
+  this.mapping_ = mapping;
+};
+
+
+/**
+ * List of events supported by this source.
+ * @return {Array.<string>} Event names
+ */
+ol.pointer.EventSource.prototype.getEvents = function() {
+  return Object.keys(this.mapping_);
+};
+
+
+/**
+ * Returns a mapping between the supported event types and
+ * the handlers that should handle an event.
+ * @return {Object.<string, function(goog.events.BrowserEvent)>}
+ *         Event/Handler mapping
+ */
+ol.pointer.EventSource.prototype.getMapping = function() {
+  return this.mapping_;
+};
+
+
+/**
+ * Returns the handler that should handle a given event type.
+ * @param {string} eventType
+ * @return {function(goog.events.BrowserEvent)} Handler
+ */
+ol.pointer.EventSource.prototype.getHandlerForEvent = function(eventType) {
+  return this.mapping_[eventType];
+};
+
+// Based on https://github.com/Polymer/PointerEvents
+
+// Copyright (c) 2013 The Polymer Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+goog.provide('ol.pointer.MouseSource');
+
+goog.require('ol.pointer.EventSource');
+
+
+
+/**
+ * @param {ol.pointer.PointerEventHandler} dispatcher
+ * @constructor
+ * @extends {ol.pointer.EventSource}
+ */
+ol.pointer.MouseSource = function(dispatcher) {
+  var mapping = {
+    'mousedown': this.mousedown,
+    'mousemove': this.mousemove,
+    'mouseup': this.mouseup,
+    'mouseover': this.mouseover,
+    'mouseout': this.mouseout
+  };
+  goog.base(this, dispatcher, mapping);
+
+  /**
+   * @const
+   * @type {!Object.<string, goog.events.BrowserEvent|Object>}
+   */
+  this.pointerMap = dispatcher.pointerMap;
+
+  /**
+   * @const
+   * @type {Array.<ol.Pixel>}
+   */
+  this.lastTouches = [];
+};
+goog.inherits(ol.pointer.MouseSource, ol.pointer.EventSource);
+
+
+/**
+ * @const
+ * @type {number}
+ */
+ol.pointer.MouseSource.POINTER_ID = 1;
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.pointer.MouseSource.POINTER_TYPE = 'mouse';
+
+
+/**
+ * Radius around touchend that swallows mouse events.
+ *
+ * @const
+ * @type {number}
+ */
+ol.pointer.MouseSource.DEDUP_DIST = 25;
+
+
+/**
+ * Detect if a mouse event was simulated from a touch by
+ * checking if previously there was a touch event at the
+ * same position.
+ *
+ * FIXME - Known problem with the native Android browser on
+ * Samsung GT-I9100 (Android 4.1.2):
+ * In case the page is scrolled, this function does not work
+ * correctly when a canvas is used (WebGL or canvas renderer).
+ * Mouse listeners on canvas elements (for this browser), create
+ * two mouse events: One 'good' and one 'bad' one (on other browsers or
+ * when a div is used, there is only one event). For the 'bad' one,
+ * clientX/clientY and also pageX/pageY are wrong when the page
+ * is scrolled. Because of that, this function can not detect if
+ * the events were simulated from a touch event. As result, a
+ * pointer event at a wrong position is dispatched, which confuses
+ * the map interactions.
+ * It is unclear, how one can get the correct position for the event
+ * or detect that the positions are invalid.
+ *
+ * @private
+ * @param {goog.events.BrowserEvent} inEvent
+ * @return {boolean} True, if the event was generated by a touch.
+ */
+ol.pointer.MouseSource.prototype.isEventSimulatedFromTouch_ =
+    function(inEvent) {
+  var lts = this.lastTouches;
+  var x = inEvent.clientX, y = inEvent.clientY;
+  for (var i = 0, l = lts.length, t; i < l && (t = lts[i]); i++) {
+    // simulated mouse events will be swallowed near a primary touchend
+    var dx = Math.abs(x - t[0]), dy = Math.abs(y - t[1]);
+    if (dx <= ol.pointer.MouseSource.DEDUP_DIST &&
+        dy <= ol.pointer.MouseSource.DEDUP_DIST) {
+      return true;
+    }
+  }
+  return false;
+};
+
+
+/**
+ * Creates a copy of the original event that will be used
+ * for the fake pointer event.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ * @param {ol.pointer.PointerEventHandler} dispatcher
+ * @return {Object}
+ */
+ol.pointer.MouseSource.prepareEvent = function(inEvent, dispatcher) {
+  var e = dispatcher.cloneEvent(inEvent, inEvent.getBrowserEvent());
+
+  // forward mouse preventDefault
+  var pd = e.preventDefault;
+  e.preventDefault = function() {
+    inEvent.preventDefault();
+    pd();
+  };
+
+  e.pointerId = ol.pointer.MouseSource.POINTER_ID;
+  e.isPrimary = true;
+  e.pointerType = ol.pointer.MouseSource.POINTER_TYPE;
+
+  return e;
+};
+
+
+/**
+ * Handler for `mousedown`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.MouseSource.prototype.mousedown = function(inEvent) {
+  if (!this.isEventSimulatedFromTouch_(inEvent)) {
+    // TODO(dfreedman) workaround for some elements not sending mouseup
+    // http://crbug/149091
+    if (ol.pointer.MouseSource.POINTER_ID.toString() in this.pointerMap) {
+      this.cancel(inEvent);
+    }
+    var e = ol.pointer.MouseSource.prepareEvent(inEvent, this.dispatcher);
+    this.pointerMap[ol.pointer.MouseSource.POINTER_ID.toString()] = inEvent;
+    this.dispatcher.down(e, inEvent);
+  }
+};
+
+
+/**
+ * Handler for `mousemove`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.MouseSource.prototype.mousemove = function(inEvent) {
+  if (!this.isEventSimulatedFromTouch_(inEvent)) {
+    var e = ol.pointer.MouseSource.prepareEvent(inEvent, this.dispatcher);
+    this.dispatcher.move(e, inEvent);
+  }
+};
+
+
+/**
+ * Handler for `mouseup`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.MouseSource.prototype.mouseup = function(inEvent) {
+  if (!this.isEventSimulatedFromTouch_(inEvent)) {
+    var p = this.pointerMap[ol.pointer.MouseSource.POINTER_ID.toString()];
+
+    if (p && p.button === inEvent.button) {
+      var e = ol.pointer.MouseSource.prepareEvent(inEvent, this.dispatcher);
+      this.dispatcher.up(e, inEvent);
+      this.cleanupMouse();
+    }
+  }
+};
+
+
+/**
+ * Handler for `mouseover`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.MouseSource.prototype.mouseover = function(inEvent) {
+  if (!this.isEventSimulatedFromTouch_(inEvent)) {
+    var e = ol.pointer.MouseSource.prepareEvent(inEvent, this.dispatcher);
+    this.dispatcher.enterOver(e, inEvent);
+  }
+};
+
+
+/**
+ * Handler for `mouseout`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.MouseSource.prototype.mouseout = function(inEvent) {
+  if (!this.isEventSimulatedFromTouch_(inEvent)) {
+    var e = ol.pointer.MouseSource.prepareEvent(inEvent, this.dispatcher);
+    this.dispatcher.leaveOut(e, inEvent);
+  }
+};
+
+
+/**
+ * Dispatches a `pointercancel` event.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.MouseSource.prototype.cancel = function(inEvent) {
+  var e = ol.pointer.MouseSource.prepareEvent(inEvent, this.dispatcher);
+  this.dispatcher.cancel(e, inEvent);
+  this.cleanupMouse();
+};
+
+
+/**
+ * Remove the mouse from the list of active pointers.
+ */
+ol.pointer.MouseSource.prototype.cleanupMouse = function() {
+  delete this.pointerMap[ol.pointer.MouseSource.POINTER_ID.toString()];
+};
+
+// Based on https://github.com/Polymer/PointerEvents
+
+// Copyright (c) 2013 The Polymer Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+goog.provide('ol.pointer.MsSource');
+
+goog.require('ol.pointer.EventSource');
+
+
+
+/**
+ * @param {ol.pointer.PointerEventHandler} dispatcher
+ * @constructor
+ * @extends {ol.pointer.EventSource}
+ */
+ol.pointer.MsSource = function(dispatcher) {
+  var mapping = {
+    'MSPointerDown': this.msPointerDown,
+    'MSPointerMove': this.msPointerMove,
+    'MSPointerUp': this.msPointerUp,
+    'MSPointerOut': this.msPointerOut,
+    'MSPointerOver': this.msPointerOver,
+    'MSPointerCancel': this.msPointerCancel,
+    'MSGotPointerCapture': this.msGotPointerCapture,
+    'MSLostPointerCapture': this.msLostPointerCapture
+  };
+  goog.base(this, dispatcher, mapping);
+
+  /**
+   * @const
+   * @type {!Object.<string, goog.events.BrowserEvent|Object>}
+   */
+  this.pointerMap = dispatcher.pointerMap;
+
+  /**
+   * @const
+   * @type {Array.<string>}
+   */
+  this.POINTER_TYPES = [
+    '',
+    'unavailable',
+    'touch',
+    'pen',
+    'mouse'
+  ];
+};
+goog.inherits(ol.pointer.MsSource, ol.pointer.EventSource);
+
+
+/**
+ * Creates a copy of the original event that will be used
+ * for the fake pointer event.
+ *
+ * @private
+ * @param {goog.events.BrowserEvent} inEvent
+ * @return {Object}
+ */
+ol.pointer.MsSource.prototype.prepareEvent_ = function(inEvent) {
+  var e = inEvent;
+  if (goog.isNumber(inEvent.getBrowserEvent().pointerType)) {
+    e = this.dispatcher.cloneEvent(inEvent, inEvent.getBrowserEvent());
+    e.pointerType = this.POINTER_TYPES[inEvent.getBrowserEvent().pointerType];
+  }
+
+  return e;
+};
+
+
+/**
+ * Remove this pointer from the list of active pointers.
+ * @param {number} pointerId
+ */
+ol.pointer.MsSource.prototype.cleanup = function(pointerId) {
+  delete this.pointerMap[pointerId.toString()];
+};
+
+
+/**
+ * Handler for `msPointerDown`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.MsSource.prototype.msPointerDown = function(inEvent) {
+  this.pointerMap[inEvent.getBrowserEvent().pointerId.toString()] = inEvent;
+  var e = this.prepareEvent_(inEvent);
+  this.dispatcher.down(e, inEvent);
+};
+
+
+/**
+ * Handler for `msPointerMove`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.MsSource.prototype.msPointerMove = function(inEvent) {
+  var e = this.prepareEvent_(inEvent);
+  this.dispatcher.move(e, inEvent);
+};
+
+
+/**
+ * Handler for `msPointerUp`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.MsSource.prototype.msPointerUp = function(inEvent) {
+  var e = this.prepareEvent_(inEvent);
+  this.dispatcher.up(e, inEvent);
+  this.cleanup(inEvent.getBrowserEvent().pointerId);
+};
+
+
+/**
+ * Handler for `msPointerOut`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.MsSource.prototype.msPointerOut = function(inEvent) {
+  var e = this.prepareEvent_(inEvent);
+  this.dispatcher.leaveOut(e, inEvent);
+};
+
+
+/**
+ * Handler for `msPointerOver`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.MsSource.prototype.msPointerOver = function(inEvent) {
+  var e = this.prepareEvent_(inEvent);
+  this.dispatcher.enterOver(e, inEvent);
+};
+
+
+/**
+ * Handler for `msPointerCancel`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.MsSource.prototype.msPointerCancel = function(inEvent) {
+  var e = this.prepareEvent_(inEvent);
+  this.dispatcher.cancel(e, inEvent);
+  this.cleanup(inEvent.getBrowserEvent().pointerId);
+};
+
+
+/**
+ * Handler for `msLostPointerCapture`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.MsSource.prototype.msLostPointerCapture = function(inEvent) {
+  var e = this.dispatcher.makeEvent('lostpointercapture',
+      inEvent.getBrowserEvent(), inEvent);
+  this.dispatcher.dispatchEvent(e);
+};
+
+
+/**
+ * Handler for `msGotPointerCapture`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.MsSource.prototype.msGotPointerCapture = function(inEvent) {
+  var e = this.dispatcher.makeEvent('gotpointercapture',
+      inEvent.getBrowserEvent(), inEvent);
+  this.dispatcher.dispatchEvent(e);
+};
+
+// Based on https://github.com/Polymer/PointerEvents
+
+// Copyright (c) 2013 The Polymer Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+goog.provide('ol.pointer.NativeSource');
+
+goog.require('ol.pointer.EventSource');
+
+
+
+/**
+ * @param {ol.pointer.PointerEventHandler} dispatcher
+ * @constructor
+ * @extends {ol.pointer.EventSource}
+ */
+ol.pointer.NativeSource = function(dispatcher) {
+  var mapping = {
+    'pointerdown': this.pointerDown,
+    'pointermove': this.pointerMove,
+    'pointerup': this.pointerUp,
+    'pointerout': this.pointerOut,
+    'pointerover': this.pointerOver,
+    'pointercancel': this.pointerCancel,
+    'gotpointercapture': this.gotPointerCapture,
+    'lostpointercapture': this.lostPointerCapture
+  };
+  goog.base(this, dispatcher, mapping);
+};
+goog.inherits(ol.pointer.NativeSource, ol.pointer.EventSource);
+
+
+/**
+ * Handler for `pointerdown`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.NativeSource.prototype.pointerDown = function(inEvent) {
+  this.dispatcher.fireNativeEvent(inEvent);
+};
+
+
+/**
+ * Handler for `pointermove`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.NativeSource.prototype.pointerMove = function(inEvent) {
+  this.dispatcher.fireNativeEvent(inEvent);
+};
+
+
+/**
+ * Handler for `pointerup`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.NativeSource.prototype.pointerUp = function(inEvent) {
+  this.dispatcher.fireNativeEvent(inEvent);
+};
+
+
+/**
+ * Handler for `pointerout`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.NativeSource.prototype.pointerOut = function(inEvent) {
+  this.dispatcher.fireNativeEvent(inEvent);
+};
+
+
+/**
+ * Handler for `pointerover`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.NativeSource.prototype.pointerOver = function(inEvent) {
+  this.dispatcher.fireNativeEvent(inEvent);
+};
+
+
+/**
+ * Handler for `pointercancel`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.NativeSource.prototype.pointerCancel = function(inEvent) {
+  this.dispatcher.fireNativeEvent(inEvent);
+};
+
+
+/**
+ * Handler for `lostpointercapture`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.NativeSource.prototype.lostPointerCapture = function(inEvent) {
+  this.dispatcher.fireNativeEvent(inEvent);
+};
+
+
+/**
+ * Handler for `gotpointercapture`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.NativeSource.prototype.gotPointerCapture = function(inEvent) {
+  this.dispatcher.fireNativeEvent(inEvent);
+};
+
+// Based on https://github.com/Polymer/PointerEvents
+
+// Copyright (c) 2013 The Polymer Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+goog.provide('ol.pointer.TouchSource');
+
+goog.require('goog.array');
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.pointer.EventSource');
+goog.require('ol.pointer.MouseSource');
+
+
+
+/**
+ * @constructor
+ * @param {ol.pointer.PointerEventHandler} dispatcher
+ * @param {ol.pointer.MouseSource} mouseSource
+ * @extends {ol.pointer.EventSource}
+ */
+ol.pointer.TouchSource = function(dispatcher, mouseSource) {
+  var mapping = {
+    'touchstart': this.touchstart,
+    'touchmove': this.touchmove,
+    'touchend': this.touchend,
+    'touchcancel': this.touchcancel
+  };
+  goog.base(this, dispatcher, mapping);
+
+  /**
+   * @const
+   * @type {!Object.<string, goog.events.BrowserEvent|Object>}
+   */
+  this.pointerMap = dispatcher.pointerMap;
+
+  /**
+   * @const
+   * @type {ol.pointer.MouseSource}
+   */
+  this.mouseSource = mouseSource;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.firstTouchId_ = undefined;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.clickCount_ = 0;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.resetId_ = undefined;
+};
+goog.inherits(ol.pointer.TouchSource, ol.pointer.EventSource);
+
+
+/**
+ * Mouse event timeout: This should be long enough to
+ * ignore compat mouse events made by touch.
+ * @const
+ * @type {number}
+ */
+ol.pointer.TouchSource.DEDUP_TIMEOUT = 2500;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+ol.pointer.TouchSource.CLICK_COUNT_TIMEOUT = 200;
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.pointer.TouchSource.POINTER_TYPE = 'touch';
+
+
+/**
+ * @private
+ * @param {Touch} inTouch
+ * @return {boolean} True, if this is the primary touch.
+ */
+ol.pointer.TouchSource.prototype.isPrimaryTouch_ = function(inTouch) {
+  return this.firstTouchId_ === inTouch.identifier;
+};
+
+
+/**
+ * Set primary touch if there are no pointers, or the only pointer is the mouse.
+ * @param {Touch} inTouch
+ * @private
+ */
+ol.pointer.TouchSource.prototype.setPrimaryTouch_ = function(inTouch) {
+  var count = goog.object.getCount(this.pointerMap);
+  if (count === 0 || (count === 1 &&
+      ol.pointer.MouseSource.POINTER_ID.toString() in this.pointerMap)) {
+    this.firstTouchId_ = inTouch.identifier;
+    this.cancelResetClickCount_();
+  }
+};
+
+
+/**
+ * @private
+ * @param {Object} inPointer
+ */
+ol.pointer.TouchSource.prototype.removePrimaryPointer_ = function(inPointer) {
+  if (inPointer.isPrimary) {
+    this.firstTouchId_ = undefined;
+    this.resetClickCount_();
+  }
+};
+
+
+/**
+ * @private
+ */
+ol.pointer.TouchSource.prototype.resetClickCount_ = function() {
+  this.resetId_ = goog.global.setTimeout(
+      goog.bind(this.resetClickCountHandler_, this),
+      ol.pointer.TouchSource.CLICK_COUNT_TIMEOUT);
+};
+
+
+/**
+ * @private
+ */
+ol.pointer.TouchSource.prototype.resetClickCountHandler_ = function() {
+  this.clickCount_ = 0;
+  this.resetId_ = undefined;
+};
+
+
+/**
+ * @private
+ */
+ol.pointer.TouchSource.prototype.cancelResetClickCount_ = function() {
+  if (this.resetId_ !== undefined) {
+    goog.global.clearTimeout(this.resetId_);
+  }
+};
+
+
+/**
+ * @private
+ * @param {goog.events.BrowserEvent} browserEvent Browser event
+ * @param {Touch} inTouch Touch event
+ * @return {Object}
+ */
+ol.pointer.TouchSource.prototype.touchToPointer_ =
+    function(browserEvent, inTouch) {
+  var e = this.dispatcher.cloneEvent(browserEvent, inTouch);
+  // Spec specifies that pointerId 1 is reserved for Mouse.
+  // Touch identifiers can start at 0.
+  // Add 2 to the touch identifier for compatibility.
+  e.pointerId = inTouch.identifier + 2;
+  // TODO: check if this is necessary?
+  //e.target = findTarget(e);
+  e.bubbles = true;
+  e.cancelable = true;
+  e.detail = this.clickCount_;
+  e.button = 0;
+  e.buttons = 1;
+  e.width = inTouch.webkitRadiusX || inTouch.radiusX || 0;
+  e.height = inTouch.webkitRadiusY || inTouch.radiusY || 0;
+  e.pressure = inTouch.webkitForce || inTouch.force || 0.5;
+  e.isPrimary = this.isPrimaryTouch_(inTouch);
+  e.pointerType = ol.pointer.TouchSource.POINTER_TYPE;
+
+  // make sure that the properties that are different for
+  // each `Touch` object are not copied from the BrowserEvent object
+  e.clientX = inTouch.clientX;
+  e.clientY = inTouch.clientY;
+  e.screenX = inTouch.screenX;
+  e.screenY = inTouch.screenY;
+
+  return e;
+};
+
+
+/**
+ * @private
+ * @param {goog.events.BrowserEvent} inEvent Touch event
+ * @param {function(goog.events.BrowserEvent, Object)} inFunction
+ */
+ol.pointer.TouchSource.prototype.processTouches_ =
+    function(inEvent, inFunction) {
+  var touches = Array.prototype.slice.call(
+      inEvent.getBrowserEvent().changedTouches);
+  var count = touches.length;
+  function preventDefault() {
+    inEvent.preventDefault();
+  }
+  var i, pointer;
+  for (i = 0; i < count; ++i) {
+    pointer = this.touchToPointer_(inEvent, touches[i]);
+    // forward touch preventDefaults
+    pointer.preventDefault = preventDefault;
+    inFunction.call(this, inEvent, pointer);
+  }
+};
+
+
+/**
+ * @private
+ * @param {TouchList} touchList
+ * @param {number} searchId
+ * @return {boolean} True, if the `Touch` with the given id is in the list.
+ */
+ol.pointer.TouchSource.prototype.findTouch_ = function(touchList, searchId) {
+  var l = touchList.length;
+  var touch;
+  for (var i = 0; i < l; i++) {
+    touch = touchList[i];
+    if (touch.identifier === searchId) {
+      return true;
+    }
+  }
+  return false;
+};
+
+
+/**
+ * In some instances, a touchstart can happen without a touchend. This
+ * leaves the pointermap in a broken state.
+ * Therefore, on every touchstart, we remove the touches that did not fire a
+ * touchend event.
+ * To keep state globally consistent, we fire a pointercancel for
+ * this "abandoned" touch
+ *
+ * @private
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.TouchSource.prototype.vacuumTouches_ = function(inEvent) {
+  var touchList = inEvent.getBrowserEvent().touches;
+  // pointerMap.getCount() should be < touchList.length here,
+  // as the touchstart has not been processed yet.
+  var keys = Object.keys(this.pointerMap);
+  var count = keys.length;
+  if (count >= touchList.length) {
+    var d = [];
+    var i, key, value;
+    for (i = 0; i < count; ++i) {
+      key = keys[i];
+      value = this.pointerMap[key];
+      // Never remove pointerId == 1, which is mouse.
+      // Touch identifiers are 2 smaller than their pointerId, which is the
+      // index in pointermap.
+      if (key != ol.pointer.MouseSource.POINTER_ID &&
+          !this.findTouch_(touchList, key - 2)) {
+        d.push(value.out);
+      }
+    }
+    for (i = 0; i < d.length; ++i) {
+      this.cancelOut_(inEvent, d[i]);
+    }
+  }
+};
+
+
+/**
+ * Handler for `touchstart`, triggers `pointerover`,
+ * `pointerenter` and `pointerdown` events.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.TouchSource.prototype.touchstart = function(inEvent) {
+  this.vacuumTouches_(inEvent);
+  this.setPrimaryTouch_(inEvent.getBrowserEvent().changedTouches[0]);
+  this.dedupSynthMouse_(inEvent);
+  this.clickCount_++;
+  this.processTouches_(inEvent, this.overDown_);
+};
+
+
+/**
+ * @private
+ * @param {goog.events.BrowserEvent} browserEvent
+ * @param {Object} inPointer
+ */
+ol.pointer.TouchSource.prototype.overDown_ = function(browserEvent, inPointer) {
+  this.pointerMap[inPointer.pointerId] = {
+    target: inPointer.target,
+    out: inPointer,
+    outTarget: inPointer.target
+  };
+  this.dispatcher.over(inPointer, browserEvent);
+  this.dispatcher.enter(inPointer, browserEvent);
+  this.dispatcher.down(inPointer, browserEvent);
+};
+
+
+/**
+ * Handler for `touchmove`.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.TouchSource.prototype.touchmove = function(inEvent) {
+  inEvent.preventDefault();
+  this.processTouches_(inEvent, this.moveOverOut_);
+};
+
+
+/**
+ * @private
+ * @param {goog.events.BrowserEvent} browserEvent
+ * @param {Object} inPointer
+ */
+ol.pointer.TouchSource.prototype.moveOverOut_ =
+    function(browserEvent, inPointer) {
+  var event = inPointer;
+  var pointer = this.pointerMap[event.pointerId];
+  // a finger drifted off the screen, ignore it
+  if (!pointer) {
+    return;
+  }
+  var outEvent = pointer.out;
+  var outTarget = pointer.outTarget;
+  this.dispatcher.move(event, browserEvent);
+  if (outEvent && outTarget !== event.target) {
+    outEvent.relatedTarget = event.target;
+    event.relatedTarget = outTarget;
+    // recover from retargeting by shadow
+    outEvent.target = outTarget;
+    if (event.target) {
+      this.dispatcher.leaveOut(outEvent, browserEvent);
+      this.dispatcher.enterOver(event, browserEvent);
+    } else {
+      // clean up case when finger leaves the screen
+      event.target = outTarget;
+      event.relatedTarget = null;
+      this.cancelOut_(browserEvent, event);
+    }
+  }
+  pointer.out = event;
+  pointer.outTarget = event.target;
+};
+
+
+/**
+ * Handler for `touchend`, triggers `pointerup`,
+ * `pointerout` and `pointerleave` events.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.TouchSource.prototype.touchend = function(inEvent) {
+  this.dedupSynthMouse_(inEvent);
+  this.processTouches_(inEvent, this.upOut_);
+};
+
+
+/**
+ * @private
+ * @param {goog.events.BrowserEvent} browserEvent
+ * @param {Object} inPointer
+ */
+ol.pointer.TouchSource.prototype.upOut_ = function(browserEvent, inPointer) {
+  this.dispatcher.up(inPointer, browserEvent);
+  this.dispatcher.out(inPointer, browserEvent);
+  this.dispatcher.leave(inPointer, browserEvent);
+  this.cleanUpPointer_(inPointer);
+};
+
+
+/**
+ * Handler for `touchcancel`, triggers `pointercancel`,
+ * `pointerout` and `pointerleave` events.
+ *
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.TouchSource.prototype.touchcancel = function(inEvent) {
+  this.processTouches_(inEvent, this.cancelOut_);
+};
+
+
+/**
+ * @private
+ * @param {goog.events.BrowserEvent} browserEvent
+ * @param {Object} inPointer
+ */
+ol.pointer.TouchSource.prototype.cancelOut_ =
+    function(browserEvent, inPointer) {
+  this.dispatcher.cancel(inPointer, browserEvent);
+  this.dispatcher.out(inPointer, browserEvent);
+  this.dispatcher.leave(inPointer, browserEvent);
+  this.cleanUpPointer_(inPointer);
+};
+
+
+/**
+ * @private
+ * @param {Object} inPointer
+ */
+ol.pointer.TouchSource.prototype.cleanUpPointer_ = function(inPointer) {
+  delete this.pointerMap[inPointer.pointerId];
+  this.removePrimaryPointer_(inPointer);
+};
+
+
+/**
+ * Prevent synth mouse events from creating pointer events.
+ *
+ * @private
+ * @param {goog.events.BrowserEvent} inEvent
+ */
+ol.pointer.TouchSource.prototype.dedupSynthMouse_ = function(inEvent) {
+  var lts = this.mouseSource.lastTouches;
+  var t = inEvent.getBrowserEvent().changedTouches[0];
+  // only the primary finger will synth mouse events
+  if (this.isPrimaryTouch_(t)) {
+    // remember x/y of last touch
+    var lt = /** @type {ol.Pixel} */ ([t.clientX, t.clientY]);
+    lts.push(lt);
+
+    goog.global.setTimeout(function() {
+      // remove touch after timeout
+      goog.array.remove(lts, lt);
+    }, ol.pointer.TouchSource.DEDUP_TIMEOUT);
+  }
+};
+
+// Based on https://github.com/Polymer/PointerEvents
+
+// Copyright (c) 2013 The Polymer Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+goog.provide('ol.pointer.PointerEventHandler');
+
+goog.require('goog.dom');
+goog.require('goog.events');
+goog.require('goog.events.BrowserEvent');
+goog.require('goog.events.EventTarget');
+
+goog.require('ol.has');
+goog.require('ol.pointer.MouseSource');
+goog.require('ol.pointer.MsSource');
+goog.require('ol.pointer.NativeSource');
+goog.require('ol.pointer.PointerEvent');
+goog.require('ol.pointer.TouchSource');
+
+
+
+/**
+ * @constructor
+ * @extends {goog.events.EventTarget}
+ * @param {Element|HTMLDocument} element Viewport element.
+ */
+ol.pointer.PointerEventHandler = function(element) {
+  goog.base(this);
+
+  /**
+   * @const
+   * @private
+   * @type {Element|HTMLDocument}
+   */
+  this.element_ = element;
+
+  /**
+   * @const
+   * @type {!Object.<string, goog.events.BrowserEvent|Object>}
+   */
+  this.pointerMap = {};
+
+  /**
+   * @type {Object.<string, function(goog.events.BrowserEvent)>}
+   * @private
+   */
+  this.eventMap_ = {};
+
+  /**
+   * @type {Array.<ol.pointer.EventSource>}
+   * @private
+   */
+  this.eventSourceList_ = [];
+
+  this.registerSources();
+};
+goog.inherits(ol.pointer.PointerEventHandler, goog.events.EventTarget);
+
+
+/**
+ * Set up the event sources (mouse, touch and native pointers)
+ * that generate pointer events.
+ */
+ol.pointer.PointerEventHandler.prototype.registerSources = function() {
+  if (ol.has.POINTER) {
+    this.registerSource('native', new ol.pointer.NativeSource(this));
+  } else if (ol.has.MSPOINTER) {
+    this.registerSource('ms', new ol.pointer.MsSource(this));
+  } else {
+    var mouseSource = new ol.pointer.MouseSource(this);
+    this.registerSource('mouse', mouseSource);
+
+    if (ol.has.TOUCH) {
+      this.registerSource('touch',
+          new ol.pointer.TouchSource(this, mouseSource));
+    }
+  }
+
+  // register events on the viewport element
+  this.register_();
+};
+
+
+/**
+ * Add a new event source that will generate pointer events.
+ *
+ * @param {string} name A name for the event source
+ * @param {ol.pointer.EventSource} source
+ */
+ol.pointer.PointerEventHandler.prototype.registerSource =
+    function(name, source) {
+  var s = source;
+  var newEvents = s.getEvents();
+
+  if (newEvents) {
+    newEvents.forEach(function(e) {
+      var handler = s.getHandlerForEvent(e);
+
+      if (handler) {
+        this.eventMap_[e] = goog.bind(handler, s);
+      }
+    }, this);
+    this.eventSourceList_.push(s);
+  }
+};
+
+
+/**
+ * Set up the events for all registered event sources.
+ * @private
+ */
+ol.pointer.PointerEventHandler.prototype.register_ = function() {
+  var l = this.eventSourceList_.length;
+  var eventSource;
+  for (var i = 0; i < l; i++) {
+    eventSource = this.eventSourceList_[i];
+    this.addEvents_(eventSource.getEvents());
+  }
+};
+
+
+/**
+ * Remove all registered events.
+ * @private
+ */
+ol.pointer.PointerEventHandler.prototype.unregister_ = function() {
+  var l = this.eventSourceList_.length;
+  var eventSource;
+  for (var i = 0; i < l; i++) {
+    eventSource = this.eventSourceList_[i];
+    this.removeEvents_(eventSource.getEvents());
+  }
+};
+
+
+/**
+ * Calls the right handler for a new event.
+ * @private
+ * @param {goog.events.BrowserEvent} inEvent Browser event.
+ */
+ol.pointer.PointerEventHandler.prototype.eventHandler_ = function(inEvent) {
+  var type = inEvent.type;
+  var handler = this.eventMap_[type];
+  if (handler) {
+    handler(inEvent);
+  }
+};
+
+
+/**
+ * Setup listeners for the given events.
+ * @private
+ * @param {Array.<string>} events List of events.
+ */
+ol.pointer.PointerEventHandler.prototype.addEvents_ = function(events) {
+  events.forEach(function(eventName) {
+    goog.events.listen(this.element_, eventName,
+        this.eventHandler_, false, this);
+  }, this);
+};
+
+
+/**
+ * Unregister listeners for the given events.
+ * @private
+ * @param {Array.<string>} events List of events.
+ */
+ol.pointer.PointerEventHandler.prototype.removeEvents_ = function(events) {
+  events.forEach(function(e) {
+    goog.events.unlisten(this.element_, e,
+        this.eventHandler_, false, this);
+  }, this);
+};
+
+
+/**
+ * Returns a snapshot of inEvent, with writable properties.
+ *
+ * @param {goog.events.BrowserEvent} browserEvent Browser event.
+ * @param {Event|Touch} inEvent An event that contains
+ *    properties to copy.
+ * @return {Object} An object containing shallow copies of
+ *    `inEvent`'s properties.
+ */
+ol.pointer.PointerEventHandler.prototype.cloneEvent =
+    function(browserEvent, inEvent) {
+  var eventCopy = {}, p;
+  for (var i = 0, ii = ol.pointer.CLONE_PROPS.length; i < ii; i++) {
+    p = ol.pointer.CLONE_PROPS[i][0];
+    eventCopy[p] =
+        browserEvent[p] ||
+        inEvent[p] ||
+        ol.pointer.CLONE_PROPS[i][1];
+  }
+
+  return eventCopy;
+};
+
+
+// EVENTS
+
+
+/**
+ * Triggers a 'pointerdown' event.
+ * @param {Object} pointerEventData
+ * @param {goog.events.BrowserEvent} browserEvent
+ */
+ol.pointer.PointerEventHandler.prototype.down =
+    function(pointerEventData, browserEvent) {
+  this.fireEvent(ol.pointer.EventType.POINTERDOWN,
+      pointerEventData, browserEvent);
+};
+
+
+/**
+ * Triggers a 'pointermove' event.
+ * @param {Object} pointerEventData
+ * @param {goog.events.BrowserEvent} browserEvent
+ */
+ol.pointer.PointerEventHandler.prototype.move =
+    function(pointerEventData, browserEvent) {
+  this.fireEvent(ol.pointer.EventType.POINTERMOVE,
+      pointerEventData, browserEvent);
+};
+
+
+/**
+ * Triggers a 'pointerup' event.
+ * @param {Object} pointerEventData
+ * @param {goog.events.BrowserEvent} browserEvent
+ */
+ol.pointer.PointerEventHandler.prototype.up =
+    function(pointerEventData, browserEvent) {
+  this.fireEvent(ol.pointer.EventType.POINTERUP,
+      pointerEventData, browserEvent);
+};
+
+
+/**
+ * Triggers a 'pointerenter' event.
+ * @param {Object} pointerEventData
+ * @param {goog.events.BrowserEvent} browserEvent
+ */
+ol.pointer.PointerEventHandler.prototype.enter =
+    function(pointerEventData, browserEvent) {
+  pointerEventData.bubbles = false;
+  this.fireEvent(ol.pointer.EventType.POINTERENTER,
+      pointerEventData, browserEvent);
+};
+
+
+/**
+ * Triggers a 'pointerleave' event.
+ * @param {Object} pointerEventData
+ * @param {goog.events.BrowserEvent} browserEvent
+ */
+ol.pointer.PointerEventHandler.prototype.leave =
+    function(pointerEventData, browserEvent) {
+  pointerEventData.bubbles = false;
+  this.fireEvent(ol.pointer.EventType.POINTERLEAVE,
+      pointerEventData, browserEvent);
+};
+
+
+/**
+ * Triggers a 'pointerover' event.
+ * @param {Object} pointerEventData
+ * @param {goog.events.BrowserEvent} browserEvent
+ */
+ol.pointer.PointerEventHandler.prototype.over =
+    function(pointerEventData, browserEvent) {
+  pointerEventData.bubbles = true;
+  this.fireEvent(ol.pointer.EventType.POINTEROVER,
+      pointerEventData, browserEvent);
+};
+
+
+/**
+ * Triggers a 'pointerout' event.
+ * @param {Object} pointerEventData
+ * @param {goog.events.BrowserEvent} browserEvent
+ */
+ol.pointer.PointerEventHandler.prototype.out =
+    function(pointerEventData, browserEvent) {
+  pointerEventData.bubbles = true;
+  this.fireEvent(ol.pointer.EventType.POINTEROUT,
+      pointerEventData, browserEvent);
+};
+
+
+/**
+ * Triggers a 'pointercancel' event.
+ * @param {Object} pointerEventData
+ * @param {goog.events.BrowserEvent} browserEvent
+ */
+ol.pointer.PointerEventHandler.prototype.cancel =
+    function(pointerEventData, browserEvent) {
+  this.fireEvent(ol.pointer.EventType.POINTERCANCEL,
+      pointerEventData, browserEvent);
+};
+
+
+/**
+ * Triggers a combination of 'pointerout' and 'pointerleave' events.
+ * @param {Object} pointerEventData
+ * @param {goog.events.BrowserEvent} browserEvent
+ */
+ol.pointer.PointerEventHandler.prototype.leaveOut =
+    function(pointerEventData, browserEvent) {
+  this.out(pointerEventData, browserEvent);
+  if (!this.contains_(
+      pointerEventData.target,
+      pointerEventData.relatedTarget)) {
+    this.leave(pointerEventData, browserEvent);
+  }
+};
+
+
+/**
+ * Triggers a combination of 'pointerover' and 'pointerevents' events.
+ * @param {Object} pointerEventData
+ * @param {goog.events.BrowserEvent} browserEvent
+ */
+ol.pointer.PointerEventHandler.prototype.enterOver =
+    function(pointerEventData, browserEvent) {
+  this.over(pointerEventData, browserEvent);
+  if (!this.contains_(
+      pointerEventData.target,
+      pointerEventData.relatedTarget)) {
+    this.enter(pointerEventData, browserEvent);
+  }
+};
+
+
+/**
+ * @private
+ * @param {Element} container
+ * @param {Element} contained
+ * @return {boolean} Returns true if the container element
+ *   contains the other element.
+ */
+ol.pointer.PointerEventHandler.prototype.contains_ =
+    function(container, contained) {
+  if (!contained) {
+    return false;
+  }
+  return goog.dom.contains(container, contained);
+};
+
+
+// EVENT CREATION AND TRACKING
+/**
+ * Creates a new Event of type `inType`, based on the information in
+ * `pointerEventData`.
+ *
+ * @param {string} inType A string representing the type of event to create.
+ * @param {Object} pointerEventData
+ * @param {goog.events.BrowserEvent} browserEvent
+ * @return {ol.pointer.PointerEvent} A PointerEvent of type `inType`.
+ */
+ol.pointer.PointerEventHandler.prototype.makeEvent =
+    function(inType, pointerEventData, browserEvent) {
+  return new ol.pointer.PointerEvent(inType, browserEvent, pointerEventData);
+};
+
+
+/**
+ * Make and dispatch an event in one call.
+ * @param {string} inType A string representing the type of event.
+ * @param {Object} pointerEventData
+ * @param {goog.events.BrowserEvent} browserEvent
+ */
+ol.pointer.PointerEventHandler.prototype.fireEvent =
+    function(inType, pointerEventData, browserEvent) {
+  var e = this.makeEvent(inType, pointerEventData, browserEvent);
+  this.dispatchEvent(e);
+};
+
+
+/**
+ * Creates a pointer event from a native pointer event
+ * and dispatches this event.
+ * @param {goog.events.BrowserEvent} nativeEvent A platform event with a target.
+ */
+ol.pointer.PointerEventHandler.prototype.fireNativeEvent =
+    function(nativeEvent) {
+  var e = this.makeEvent(nativeEvent.type, nativeEvent.getBrowserEvent(),
+      nativeEvent);
+  this.dispatchEvent(e);
+};
+
+
+/**
+ * Wrap a native mouse event into a pointer event.
+ * This proxy method is required for the legacy IE support.
+ * @param {string} eventType The pointer event type.
+ * @param {goog.events.BrowserEvent} browserEvent
+ * @return {ol.pointer.PointerEvent}
+ */
+ol.pointer.PointerEventHandler.prototype.wrapMouseEvent =
+    function(eventType, browserEvent) {
+  var pointerEvent = this.makeEvent(
+      eventType,
+      ol.pointer.MouseSource.prepareEvent(browserEvent, this),
+      browserEvent
+      );
+  return pointerEvent;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.pointer.PointerEventHandler.prototype.disposeInternal = function() {
+  this.unregister_();
+  goog.base(this, 'disposeInternal');
+};
+
+
+/**
+ * Constants for event names.
+ * @enum {string}
+ */
+ol.pointer.EventType = {
+  POINTERMOVE: 'pointermove',
+  POINTERDOWN: 'pointerdown',
+  POINTERUP: 'pointerup',
+  POINTEROVER: 'pointerover',
+  POINTEROUT: 'pointerout',
+  POINTERENTER: 'pointerenter',
+  POINTERLEAVE: 'pointerleave',
+  POINTERCANCEL: 'pointercancel'
+};
+
+
+/**
+ * Properties to copy when cloning an event, with default values.
+ * @type {Array.<Array>}
+ */
+ol.pointer.CLONE_PROPS = [
+  // MouseEvent
+  ['bubbles', false],
+  ['cancelable', false],
+  ['view', null],
+  ['detail', null],
+  ['screenX', 0],
+  ['screenY', 0],
+  ['clientX', 0],
+  ['clientY', 0],
+  ['ctrlKey', false],
+  ['altKey', false],
+  ['shiftKey', false],
+  ['metaKey', false],
+  ['button', 0],
+  ['relatedTarget', null],
+  // DOM Level 3
+  ['buttons', 0],
+  // PointerEvent
+  ['pointerId', 0],
+  ['width', 0],
+  ['height', 0],
+  ['pressure', 0],
+  ['tiltX', 0],
+  ['tiltY', 0],
+  ['pointerType', ''],
+  ['hwTimestamp', 0],
+  ['isPrimary', false],
+  // event instance
+  ['type', ''],
+  ['target', null],
+  ['currentTarget', null],
+  ['which', 0]
+];
+
+goog.provide('ol.MapBrowserEvent');
+goog.provide('ol.MapBrowserEvent.EventType');
+goog.provide('ol.MapBrowserEventHandler');
+goog.provide('ol.MapBrowserPointerEvent');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.BrowserEvent');
+goog.require('goog.events.EventTarget');
+goog.require('goog.events.EventType');
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.Coordinate');
+goog.require('ol.MapEvent');
+goog.require('ol.Pixel');
+goog.require('ol.pointer.PointerEvent');
+goog.require('ol.pointer.PointerEventHandler');
+
+
+
+/**
+ * @classdesc
+ * Events emitted as map browser events are instances of this type.
+ * See {@link ol.Map} for which events trigger a map browser event.
+ *
+ * @constructor
+ * @extends {ol.MapEvent}
+ * @implements {oli.MapBrowserEvent}
+ * @param {string} type Event type.
+ * @param {ol.Map} map Map.
+ * @param {goog.events.BrowserEvent} browserEvent Browser event.
+ * @param {boolean=} opt_dragging Is the map currently being dragged?
+ * @param {?olx.FrameState=} opt_frameState Frame state.
+ */
+ol.MapBrowserEvent = function(type, map, browserEvent, opt_dragging,
+    opt_frameState) {
+
+  goog.base(this, type, map, opt_frameState);
+
+  /**
+   * @const
+   * @type {goog.events.BrowserEvent}
+   */
+  this.browserEvent = browserEvent;
+
+  /**
+   * The original browser event.
+   * @const
+   * @type {Event}
+   * @api stable
+   */
+  this.originalEvent = browserEvent.getBrowserEvent();
+
+  /**
+   * The pixel of the original browser event.
+   * @type {ol.Pixel}
+   * @api stable
+   */
+  this.pixel = map.getEventPixel(this.originalEvent);
+
+  /**
+   * The coordinate of the original browser event.
+   * @type {ol.Coordinate}
+   * @api stable
+   */
+  this.coordinate = map.getCoordinateFromPixel(this.pixel);
+
+  /**
+   * Indicates if the map is currently being dragged. Only set for
+   * `POINTERDRAG` and `POINTERMOVE` events. Default is `false`.
+   *
+   * @type {boolean}
+   * @api stable
+   */
+  this.dragging = opt_dragging !== undefined ? opt_dragging : false;
+
+};
+goog.inherits(ol.MapBrowserEvent, ol.MapEvent);
+
+
+/**
+ * Prevents the default browser action.
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/event.preventDefault
+ * @override
+ * @api stable
+ */
+ol.MapBrowserEvent.prototype.preventDefault = function() {
+  goog.base(this, 'preventDefault');
+  this.browserEvent.preventDefault();
+};
+
+
+/**
+ * Prevents further propagation of the current event.
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/event.stopPropagation
+ * @override
+ * @api stable
+ */
+ol.MapBrowserEvent.prototype.stopPropagation = function() {
+  goog.base(this, 'stopPropagation');
+  this.browserEvent.stopPropagation();
+};
+
+
+
+/**
+ * @constructor
+ * @extends {ol.MapBrowserEvent}
+ * @param {string} type Event type.
+ * @param {ol.Map} map Map.
+ * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
+ * @param {boolean=} opt_dragging Is the map currently being dragged?
+ * @param {?olx.FrameState=} opt_frameState Frame state.
+ */
+ol.MapBrowserPointerEvent = function(type, map, pointerEvent, opt_dragging,
+    opt_frameState) {
+
+  goog.base(this, type, map, pointerEvent.browserEvent, opt_dragging,
+      opt_frameState);
+
+  /**
+   * @const
+   * @type {ol.pointer.PointerEvent}
+   */
+  this.pointerEvent = pointerEvent;
+
+};
+goog.inherits(ol.MapBrowserPointerEvent, ol.MapBrowserEvent);
+
+
+
+/**
+ * @param {ol.Map} map The map with the viewport to listen to events on.
+ * @constructor
+ * @extends {goog.events.EventTarget}
+ */
+ol.MapBrowserEventHandler = function(map) {
+
+  goog.base(this);
+
+  /**
+   * This is the element that we will listen to the real events on.
+   * @type {ol.Map}
+   * @private
+   */
+  this.map_ = map;
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.clickTimeoutId_ = 0;
+
+  /**
+   * @type {boolean}
+   * @private
+   */
+  this.dragging_ = false;
+
+  /**
+   * @type {Array.<goog.events.Key>}
+   * @private
+   */
+  this.dragListenerKeys_ = null;
+
+  /**
+   * @type {goog.events.Key}
+   * @private
+   */
+  this.pointerdownListenerKey_ = null;
+
+  /**
+   * The most recent "down" type event (or null if none have occurred).
+   * Set on pointerdown.
+   * @type {ol.pointer.PointerEvent}
+   * @private
+   */
+  this.down_ = null;
+
+  var element = this.map_.getViewport();
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.activePointers_ = 0;
+
+  /**
+   * @type {Object.<number, boolean>}
+   * @private
+   */
+  this.trackedTouches_ = {};
+
+  /**
+   * Event handler which generates pointer events for
+   * the viewport element.
+   *
+   * @type {ol.pointer.PointerEventHandler}
+   * @private
+   */
+  this.pointerEventHandler_ = new ol.pointer.PointerEventHandler(element);
+
+  /**
+   * Event handler which generates pointer events for
+   * the document (used when dragging).
+   *
+   * @type {ol.pointer.PointerEventHandler}
+   * @private
+   */
+  this.documentPointerEventHandler_ = null;
+
+  this.pointerdownListenerKey_ = goog.events.listen(this.pointerEventHandler_,
+      ol.pointer.EventType.POINTERDOWN,
+      this.handlePointerDown_, false, this);
+
+  this.relayedListenerKey_ = goog.events.listen(this.pointerEventHandler_,
+      ol.pointer.EventType.POINTERMOVE,
+      this.relayEvent_, false, this);
+
+};
+goog.inherits(ol.MapBrowserEventHandler, goog.events.EventTarget);
+
+
+/**
+ * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
+ * @private
+ */
+ol.MapBrowserEventHandler.prototype.emulateClick_ = function(pointerEvent) {
+  var newEvent;
+  newEvent = new ol.MapBrowserPointerEvent(
+      ol.MapBrowserEvent.EventType.CLICK, this.map_, pointerEvent);
+  this.dispatchEvent(newEvent);
+  if (this.clickTimeoutId_ !== 0) {
+    // double-click
+    goog.global.clearTimeout(this.clickTimeoutId_);
+    this.clickTimeoutId_ = 0;
+    newEvent = new ol.MapBrowserPointerEvent(
+        ol.MapBrowserEvent.EventType.DBLCLICK, this.map_, pointerEvent);
+    this.dispatchEvent(newEvent);
+  } else {
+    // click
+    this.clickTimeoutId_ = goog.global.setTimeout(goog.bind(function() {
+      this.clickTimeoutId_ = 0;
+      var newEvent = new ol.MapBrowserPointerEvent(
+          ol.MapBrowserEvent.EventType.SINGLECLICK, this.map_, pointerEvent);
+      this.dispatchEvent(newEvent);
+    }, this), 250);
+  }
+};
+
+
+/**
+ * Keeps track on how many pointers are currently active.
+ *
+ * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
+ * @private
+ */
+ol.MapBrowserEventHandler.prototype.updateActivePointers_ =
+    function(pointerEvent) {
+  var event = pointerEvent;
+
+  if (event.type == ol.MapBrowserEvent.EventType.POINTERUP ||
+      event.type == ol.MapBrowserEvent.EventType.POINTERCANCEL) {
+    delete this.trackedTouches_[event.pointerId];
+  } else if (event.type == ol.MapBrowserEvent.EventType.POINTERDOWN) {
+    this.trackedTouches_[event.pointerId] = true;
+  }
+  this.activePointers_ = goog.object.getCount(this.trackedTouches_);
+};
+
+
+/**
+ * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
+ * @private
+ */
+ol.MapBrowserEventHandler.prototype.handlePointerUp_ = function(pointerEvent) {
+  this.updateActivePointers_(pointerEvent);
+  var newEvent = new ol.MapBrowserPointerEvent(
+      ol.MapBrowserEvent.EventType.POINTERUP, this.map_, pointerEvent);
+  this.dispatchEvent(newEvent);
+
+  // We emulate click events on left mouse button click, touch contact, and pen
+  // contact. isMouseActionButton returns true in these cases (evt.button is set
+  // to 0).
+  // See http://www.w3.org/TR/pointerevents/#button-states
+  if (!this.dragging_ && this.isMouseActionButton_(pointerEvent)) {
+    goog.asserts.assert(this.down_, 'this.down_ must be truthy');
+    this.emulateClick_(this.down_);
+  }
+
+  goog.asserts.assert(this.activePointers_ >= 0,
+      'this.activePointers_ should be equal to or larger than 0');
+  if (this.activePointers_ === 0) {
+    this.dragListenerKeys_.forEach(goog.events.unlistenByKey);
+    this.dragListenerKeys_ = null;
+    this.dragging_ = false;
+    this.down_ = null;
+    goog.dispose(this.documentPointerEventHandler_);
+    this.documentPointerEventHandler_ = null;
+  }
+};
+
+
+/**
+ * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
+ * @return {boolean} If the left mouse button was pressed.
+ * @private
+ */
+ol.MapBrowserEventHandler.prototype.isMouseActionButton_ =
+    function(pointerEvent) {
+  return pointerEvent.button === 0;
+};
+
+
+/**
+ * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
+ * @private
+ */
+ol.MapBrowserEventHandler.prototype.handlePointerDown_ =
+    function(pointerEvent) {
+  this.updateActivePointers_(pointerEvent);
+  var newEvent = new ol.MapBrowserPointerEvent(
+      ol.MapBrowserEvent.EventType.POINTERDOWN, this.map_, pointerEvent);
+  this.dispatchEvent(newEvent);
+
+  this.down_ = pointerEvent;
+
+  if (!this.dragListenerKeys_) {
+    /* Set up a pointer event handler on the `document`,
+     * which is required when the pointer is moved outside
+     * the viewport when dragging.
+     */
+    this.documentPointerEventHandler_ =
+        new ol.pointer.PointerEventHandler(document);
+
+    this.dragListenerKeys_ = [
+      goog.events.listen(this.documentPointerEventHandler_,
+          ol.MapBrowserEvent.EventType.POINTERMOVE,
+          this.handlePointerMove_, false, this),
+      goog.events.listen(this.documentPointerEventHandler_,
+          ol.MapBrowserEvent.EventType.POINTERUP,
+          this.handlePointerUp_, false, this),
+      /* Note that the listener for `pointercancel is set up on
+       * `pointerEventHandler_` and not `documentPointerEventHandler_` like
+       * the `pointerup` and `pointermove` listeners.
+       *
+       * The reason for this is the following: `TouchSource.vacuumTouches_()`
+       * issues `pointercancel` events, when there was no `touchend` for a
+       * `touchstart`. Now, let's say a first `touchstart` is registered on
+       * `pointerEventHandler_`. The `documentPointerEventHandler_` is set up.
+       * But `documentPointerEventHandler_` doesn't know about the first
+       * `touchstart`. If there is no `touchend` for the `touchstart`, we can
+       * only receive a `touchcancel` from `pointerEventHandler_`, because it is
+       * only registered there.
+       */
+      goog.events.listen(this.pointerEventHandler_,
+          ol.MapBrowserEvent.EventType.POINTERCANCEL,
+          this.handlePointerUp_, false, this)
+    ];
+  }
+};
+
+
+/**
+ * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
+ * @private
+ */
+ol.MapBrowserEventHandler.prototype.handlePointerMove_ =
+    function(pointerEvent) {
+  // Fix IE10 on windows Surface : When you tap the tablet, it triggers
+  // multiple pointermove events between pointerdown and pointerup with
+  // the exact same coordinates of the pointerdown event. To avoid a
+  // 'false' touchmove event to be dispatched , we test if the pointer
+  // effectively moved.
+  if (this.isMoving_(pointerEvent)) {
+    this.dragging_ = true;
+    var newEvent = new ol.MapBrowserPointerEvent(
+        ol.MapBrowserEvent.EventType.POINTERDRAG, this.map_, pointerEvent,
+        this.dragging_);
+    this.dispatchEvent(newEvent);
+  }
+
+  // Some native android browser triggers mousemove events during small period
+  // of time. See: https://code.google.com/p/android/issues/detail?id=5491 or
+  // https://code.google.com/p/android/issues/detail?id=19827
+  // ex: Galaxy Tab P3110 + Android 4.1.1
+  pointerEvent.preventDefault();
+};
+
+
+/**
+ * Wrap and relay a pointer event.  Note that this requires that the type
+ * string for the MapBrowserPointerEvent matches the PointerEvent type.
+ * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
+ * @private
+ */
+ol.MapBrowserEventHandler.prototype.relayEvent_ = function(pointerEvent) {
+  var dragging = !!(this.down_ && this.isMoving_(pointerEvent));
+  this.dispatchEvent(new ol.MapBrowserPointerEvent(
+      pointerEvent.type, this.map_, pointerEvent, dragging));
+};
+
+
+/**
+ * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
+ * @return {boolean}
+ * @private
+ */
+ol.MapBrowserEventHandler.prototype.isMoving_ = function(pointerEvent) {
+  return pointerEvent.clientX != this.down_.clientX ||
+      pointerEvent.clientY != this.down_.clientY;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.MapBrowserEventHandler.prototype.disposeInternal = function() {
+  if (this.relayedListenerKey_) {
+    goog.events.unlistenByKey(this.relayedListenerKey_);
+    this.relayedListenerKey_ = null;
+  }
+  if (this.pointerdownListenerKey_) {
+    goog.events.unlistenByKey(this.pointerdownListenerKey_);
+    this.pointerdownListenerKey_ = null;
+  }
+  if (this.dragListenerKeys_) {
+    this.dragListenerKeys_.forEach(goog.events.unlistenByKey);
+    this.dragListenerKeys_ = null;
+  }
+  if (this.documentPointerEventHandler_) {
+    goog.dispose(this.documentPointerEventHandler_);
+    this.documentPointerEventHandler_ = null;
+  }
+  if (this.pointerEventHandler_) {
+    goog.dispose(this.pointerEventHandler_);
+    this.pointerEventHandler_ = null;
+  }
+  goog.base(this, 'disposeInternal');
+};
+
+
+/**
+ * Constants for event names.
+ * @enum {string}
+ */
+ol.MapBrowserEvent.EventType = {
+
+  /**
+   * A true single click with no dragging and no double click. Note that this
+   * event is delayed by 250 ms to ensure that it is not a double click.
+   * @event ol.MapBrowserEvent#singleclick
+   * @api stable
+   */
+  SINGLECLICK: 'singleclick',
+
+  /**
+   * A click with no dragging. A double click will fire two of this.
+   * @event ol.MapBrowserEvent#click
+   * @api stable
+   */
+  CLICK: goog.events.EventType.CLICK,
+
+  /**
+   * A true double click, with no dragging.
+   * @event ol.MapBrowserEvent#dblclick
+   * @api stable
+   */
+  DBLCLICK: goog.events.EventType.DBLCLICK,
+
+  /**
+   * Triggered when a pointer is dragged.
+   * @event ol.MapBrowserEvent#pointerdrag
+   * @api
+   */
+  POINTERDRAG: 'pointerdrag',
+
+  /**
+   * Triggered when a pointer is moved. Note that on touch devices this is
+   * triggered when the map is panned, so is not the same as mousemove.
+   * @event ol.MapBrowserEvent#pointermove
+   * @api stable
+   */
+  POINTERMOVE: 'pointermove',
+
+  POINTERDOWN: 'pointerdown',
+  POINTERUP: 'pointerup',
+  POINTEROVER: 'pointerover',
+  POINTEROUT: 'pointerout',
+  POINTERENTER: 'pointerenter',
+  POINTERLEAVE: 'pointerleave',
+  POINTERCANCEL: 'pointercancel'
+};
+
+goog.provide('ol.layer.Base');
+goog.provide('ol.layer.LayerProperty');
+goog.provide('ol.layer.LayerState');
+
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.Object');
+goog.require('ol.math');
+goog.require('ol.source.State');
+
+
+/**
+ * @enum {string}
+ */
+ol.layer.LayerProperty = {
+  OPACITY: 'opacity',
+  VISIBLE: 'visible',
+  EXTENT: 'extent',
+  Z_INDEX: 'zIndex',
+  MAX_RESOLUTION: 'maxResolution',
+  MIN_RESOLUTION: 'minResolution',
+  SOURCE: 'source'
+};
+
+
+/**
+ * @typedef {{layer: ol.layer.Layer,
+ *            opacity: number,
+ *            sourceState: ol.source.State,
+ *            visible: boolean,
+ *            managed: boolean,
+ *            extent: (ol.Extent|undefined),
+ *            zIndex: number,
+ *            maxResolution: number,
+ *            minResolution: number}}
+ */
+ol.layer.LayerState;
+
+
+
+/**
+ * @classdesc
+ * Abstract base class; normally only used for creating subclasses and not
+ * instantiated in apps.
+ * Note that with `ol.layer.Base` and all its subclasses, any property set in
+ * the options is set as a {@link ol.Object} property on the layer object, so
+ * is observable, and has get/set accessors.
+ *
+ * @constructor
+ * @extends {ol.Object}
+ * @param {olx.layer.BaseOptions} options Layer options.
+ * @api stable
+ */
+ol.layer.Base = function(options) {
+
+  goog.base(this);
+
+  /**
+   * @type {Object.<string, *>}
+   */
+  var properties = goog.object.clone(options);
+  properties[ol.layer.LayerProperty.OPACITY] =
+      options.opacity !== undefined ? options.opacity : 1;
+  properties[ol.layer.LayerProperty.VISIBLE] =
+      options.visible !== undefined ? options.visible : true;
+  properties[ol.layer.LayerProperty.Z_INDEX] =
+      options.zIndex !== undefined ? options.zIndex : 0;
+  properties[ol.layer.LayerProperty.MAX_RESOLUTION] =
+      options.maxResolution !== undefined ? options.maxResolution : Infinity;
+  properties[ol.layer.LayerProperty.MIN_RESOLUTION] =
+      options.minResolution !== undefined ? options.minResolution : 0;
+
+  this.setProperties(properties);
+};
+goog.inherits(ol.layer.Base, ol.Object);
+
+
+/**
+ * @return {ol.layer.LayerState} Layer state.
+ */
+ol.layer.Base.prototype.getLayerState = function() {
+  var opacity = this.getOpacity();
+  var sourceState = this.getSourceState();
+  var visible = this.getVisible();
+  var extent = this.getExtent();
+  var zIndex = this.getZIndex();
+  var maxResolution = this.getMaxResolution();
+  var minResolution = this.getMinResolution();
+  return {
+    layer: /** @type {ol.layer.Layer} */ (this),
+    opacity: ol.math.clamp(opacity, 0, 1),
+    sourceState: sourceState,
+    visible: visible,
+    managed: true,
+    extent: extent,
+    zIndex: zIndex,
+    maxResolution: maxResolution,
+    minResolution: Math.max(minResolution, 0)
+  };
+};
+
+
+/**
+ * @param {Array.<ol.layer.Layer>=} opt_array Array of layers (to be
+ *     modified in place).
+ * @return {Array.<ol.layer.Layer>} Array of layers.
+ */
+ol.layer.Base.prototype.getLayersArray = goog.abstractMethod;
+
+
+/**
+ * @param {Array.<ol.layer.LayerState>=} opt_states Optional list of layer
+ *     states (to be modified in place).
+ * @return {Array.<ol.layer.LayerState>} List of layer states.
+ */
+ol.layer.Base.prototype.getLayerStatesArray = goog.abstractMethod;
+
+
+/**
+ * Return the {@link ol.Extent extent} of the layer or `undefined` if it
+ * will be visible regardless of extent.
+ * @return {ol.Extent|undefined} The layer extent.
+ * @observable
+ * @api stable
+ */
+ol.layer.Base.prototype.getExtent = function() {
+  return /** @type {ol.Extent|undefined} */ (
+      this.get(ol.layer.LayerProperty.EXTENT));
+};
+
+
+/**
+ * Return the maximum resolution of the layer.
+ * @return {number} The maximum resolution of the layer.
+ * @observable
+ * @api stable
+ */
+ol.layer.Base.prototype.getMaxResolution = function() {
+  return /** @type {number} */ (
+      this.get(ol.layer.LayerProperty.MAX_RESOLUTION));
+};
+
+
+/**
+ * Return the minimum resolution of the layer.
+ * @return {number} The minimum resolution of the layer.
+ * @observable
+ * @api stable
+ */
+ol.layer.Base.prototype.getMinResolution = function() {
+  return /** @type {number} */ (
+      this.get(ol.layer.LayerProperty.MIN_RESOLUTION));
+};
+
+
+/**
+ * Return the opacity of the layer (between 0 and 1).
+ * @return {number} The opacity of the layer.
+ * @observable
+ * @api stable
+ */
+ol.layer.Base.prototype.getOpacity = function() {
+  return /** @type {number} */ (this.get(ol.layer.LayerProperty.OPACITY));
+};
+
+
+/**
+ * @return {ol.source.State} Source state.
+ */
+ol.layer.Base.prototype.getSourceState = goog.abstractMethod;
+
+
+/**
+ * Return the visibility of the layer (`true` or `false`).
+ * @return {boolean} The visibility of the layer.
+ * @observable
+ * @api stable
+ */
+ol.layer.Base.prototype.getVisible = function() {
+  return /** @type {boolean} */ (this.get(ol.layer.LayerProperty.VISIBLE));
+};
+
+
+/**
+ * Return the Z-index of the layer, which is used to order layers before
+ * rendering. The default Z-index is 0.
+ * @return {number} The Z-index of the layer.
+ * @observable
+ * @api
+ */
+ol.layer.Base.prototype.getZIndex = function() {
+  return /** @type {number} */ (this.get(ol.layer.LayerProperty.Z_INDEX));
+};
+
+
+/**
+ * Set the extent at which the layer is visible.  If `undefined`, the layer
+ * will be visible at all extents.
+ * @param {ol.Extent|undefined} extent The extent of the layer.
+ * @observable
+ * @api stable
+ */
+ol.layer.Base.prototype.setExtent = function(extent) {
+  this.set(ol.layer.LayerProperty.EXTENT, extent);
+};
+
+
+/**
+ * Set the maximum resolution at which the layer is visible.
+ * @param {number} maxResolution The maximum resolution of the layer.
+ * @observable
+ * @api stable
+ */
+ol.layer.Base.prototype.setMaxResolution = function(maxResolution) {
+  this.set(ol.layer.LayerProperty.MAX_RESOLUTION, maxResolution);
+};
+
+
+/**
+ * Set the minimum resolution at which the layer is visible.
+ * @param {number} minResolution The minimum resolution of the layer.
+ * @observable
+ * @api stable
+ */
+ol.layer.Base.prototype.setMinResolution = function(minResolution) {
+  this.set(ol.layer.LayerProperty.MIN_RESOLUTION, minResolution);
+};
+
+
+/**
+ * Set the opacity of the layer, allowed values range from 0 to 1.
+ * @param {number} opacity The opacity of the layer.
+ * @observable
+ * @api stable
+ */
+ol.layer.Base.prototype.setOpacity = function(opacity) {
+  this.set(ol.layer.LayerProperty.OPACITY, opacity);
+};
+
+
+/**
+ * Set the visibility of the layer (`true` or `false`).
+ * @param {boolean} visible The visibility of the layer.
+ * @observable
+ * @api stable
+ */
+ol.layer.Base.prototype.setVisible = function(visible) {
+  this.set(ol.layer.LayerProperty.VISIBLE, visible);
+};
+
+
+/**
+ * Set Z-index of the layer, which is used to order layers before rendering.
+ * The default Z-index is 0.
+ * @param {number} zindex The z-index of the layer.
+ * @observable
+ * @api
+ */
+ol.layer.Base.prototype.setZIndex = function(zindex) {
+  this.set(ol.layer.LayerProperty.Z_INDEX, zindex);
+};
+
+goog.provide('ol.render.VectorContext');
+
+
+
+/**
+ * Context for drawing geometries.  A vector context is available on render
+ * events and does not need to be constructed directly.
+ * @constructor
+ * @struct
+ * @api
+ */
+ol.render.VectorContext = function() {
+};
+
+
+/**
+ * @param {number} zIndex Z index.
+ * @param {function(ol.render.VectorContext)} callback Callback.
+ */
+ol.render.VectorContext.prototype.drawAsync = goog.abstractMethod;
+
+
+/**
+ * @param {ol.geom.Circle} circleGeometry Circle geometry.
+ * @param {ol.Feature} feature Feature,
+ */
+ol.render.VectorContext.prototype.drawCircleGeometry = goog.abstractMethod;
+
+
+/**
+ * @param {ol.Feature} feature Feature.
+ * @param {ol.style.Style} style Style.
+ */
+ol.render.VectorContext.prototype.drawFeature = goog.abstractMethod;
+
+
+/**
+ * @param {ol.geom.GeometryCollection} geometryCollectionGeometry Geometry
+ *     collection.
+ * @param {ol.Feature} feature Feature.
+ */
+ol.render.VectorContext.prototype.drawGeometryCollectionGeometry =
+    goog.abstractMethod;
+
+
+/**
+ * @param {ol.geom.LineString|ol.render.Feature} lineStringGeometry Line
+ *     string geometry.
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ */
+ol.render.VectorContext.prototype.drawLineStringGeometry =
+    goog.abstractMethod;
+
+
+/**
+ * @param {ol.geom.MultiLineString|ol.render.Feature} multiLineStringGeometry
+ *     MultiLineString geometry.
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ */
+ol.render.VectorContext.prototype.drawMultiLineStringGeometry =
+    goog.abstractMethod;
+
+
+/**
+ * @param {ol.geom.MultiPoint|ol.render.Feature} multiPointGeometry MultiPoint
+ *     geometry.
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ */
+ol.render.VectorContext.prototype.drawMultiPointGeometry = goog.abstractMethod;
+
+
+/**
+ * @param {ol.geom.MultiPolygon} multiPolygonGeometry MultiPolygon geometry.
+ * @param {ol.Feature} feature Feature.
+ */
+ol.render.VectorContext.prototype.drawMultiPolygonGeometry =
+    goog.abstractMethod;
+
+
+/**
+ * @param {ol.geom.Point|ol.render.Feature} pointGeometry Point geometry.
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ */
+ol.render.VectorContext.prototype.drawPointGeometry = goog.abstractMethod;
+
+
+/**
+ * @param {ol.geom.Polygon|ol.render.Feature} polygonGeometry Polygon
+ *     geometry.
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ */
+ol.render.VectorContext.prototype.drawPolygonGeometry = goog.abstractMethod;
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {ol.geom.Geometry|ol.render.Feature} geometry Geometry.
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ */
+ol.render.VectorContext.prototype.drawText = goog.abstractMethod;
+
+
+/**
+ * @param {ol.style.Fill} fillStyle Fill style.
+ * @param {ol.style.Stroke} strokeStyle Stroke style.
+ */
+ol.render.VectorContext.prototype.setFillStrokeStyle = goog.abstractMethod;
+
+
+/**
+ * @param {ol.style.Image} imageStyle Image style.
+ */
+ol.render.VectorContext.prototype.setImageStyle = goog.abstractMethod;
+
+
+/**
+ * @param {ol.style.Text} textStyle Text style.
+ */
+ol.render.VectorContext.prototype.setTextStyle = goog.abstractMethod;
+
+goog.provide('ol.render.Event');
+goog.provide('ol.render.EventType');
+
+goog.require('goog.events.Event');
+goog.require('ol.render.VectorContext');
+
+
+/**
+ * @enum {string}
+ */
+ol.render.EventType = {
+  /**
+   * @event ol.render.Event#postcompose
+   * @api
+   */
+  POSTCOMPOSE: 'postcompose',
+  /**
+   * @event ol.render.Event#precompose
+   * @api
+   */
+  PRECOMPOSE: 'precompose',
+  /**
+   * @event ol.render.Event#render
+   * @api
+   */
+  RENDER: 'render'
+};
+
+
+
+/**
+ * @constructor
+ * @extends {goog.events.Event}
+ * @implements {oli.render.Event}
+ * @param {ol.render.EventType} type Type.
+ * @param {Object=} opt_target Target.
+ * @param {ol.render.VectorContext=} opt_vectorContext Vector context.
+ * @param {olx.FrameState=} opt_frameState Frame state.
+ * @param {?CanvasRenderingContext2D=} opt_context Context.
+ * @param {?ol.webgl.Context=} opt_glContext WebGL Context.
+ */
+ol.render.Event = function(
+    type, opt_target, opt_vectorContext, opt_frameState, opt_context,
+    opt_glContext) {
+
+  goog.base(this, type, opt_target);
+
+  /**
+   * For canvas, this is an instance of {@link ol.render.canvas.Immediate}.
+   * @type {ol.render.VectorContext|undefined}
+   * @api
+   */
+  this.vectorContext = opt_vectorContext;
+
+  /**
+   * An object representing the current render frame state.
+   * @type {olx.FrameState|undefined}
+   * @api
+   */
+  this.frameState = opt_frameState;
+
+  /**
+   * Canvas context. Only available when a Canvas renderer is used, null
+   * otherwise.
+   * @type {CanvasRenderingContext2D|null|undefined}
+   * @api
+   */
+  this.context = opt_context;
+
+  /**
+   * WebGL context. Only available when a WebGL renderer is used, null
+   * otherwise.
+   * @type {ol.webgl.Context|null|undefined}
+   * @api
+   */
+  this.glContext = opt_glContext;
+
+};
+goog.inherits(ol.render.Event, goog.events.Event);
+
+goog.provide('ol.layer.Layer');
+
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.Object');
+goog.require('ol.layer.Base');
+goog.require('ol.layer.LayerProperty');
+goog.require('ol.render.EventType');
+goog.require('ol.source.State');
+
+
+
+/**
+ * @classdesc
+ * Abstract base class; normally only used for creating subclasses and not
+ * instantiated in apps.
+ * A visual representation of raster or vector map data.
+ * Layers group together those properties that pertain to how the data is to be
+ * displayed, irrespective of the source of that data.
+ *
+ * Layers are usually added to a map with {@link ol.Map#addLayer}. Components
+ * like {@link ol.interaction.Select} use unmanaged layers internally. These
+ * unmanaged layers are associated with the map using
+ * {@link ol.layer.Layer#setMap} instead.
+ *
+ * A generic `change` event is fired when the state of the source changes.
+ *
+ * @constructor
+ * @extends {ol.layer.Base}
+ * @fires ol.render.Event
+ * @param {olx.layer.LayerOptions} options Layer options.
+ * @api stable
+ */
+ol.layer.Layer = function(options) {
+
+  var baseOptions = goog.object.clone(options);
+  delete baseOptions.source;
+
+  goog.base(this, /** @type {olx.layer.LayerOptions} */ (baseOptions));
+
+  /**
+   * @private
+   * @type {goog.events.Key}
+   */
+  this.mapPrecomposeKey_ = null;
+
+  /**
+   * @private
+   * @type {goog.events.Key}
+   */
+  this.mapRenderKey_ = null;
+
+  /**
+   * @private
+   * @type {goog.events.Key}
+   */
+  this.sourceChangeKey_ = null;
+
+  if (options.map) {
+    this.setMap(options.map);
+  }
+
+  goog.events.listen(this,
+      ol.Object.getChangeEventType(ol.layer.LayerProperty.SOURCE),
+      this.handleSourcePropertyChange_, false, this);
+
+  var source = options.source ? options.source : null;
+  this.setSource(source);
+};
+goog.inherits(ol.layer.Layer, ol.layer.Base);
+
+
+/**
+ * Return `true` if the layer is visible, and if the passed resolution is
+ * between the layer's minResolution and maxResolution. The comparison is
+ * inclusive for `minResolution` and exclusive for `maxResolution`.
+ * @param {ol.layer.LayerState} layerState Layer state.
+ * @param {number} resolution Resolution.
+ * @return {boolean} The layer is visible at the given resolution.
+ */
+ol.layer.Layer.visibleAtResolution = function(layerState, resolution) {
+  return layerState.visible && resolution >= layerState.minResolution &&
+      resolution < layerState.maxResolution;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.layer.Layer.prototype.getLayersArray = function(opt_array) {
+  var array = opt_array ? opt_array : [];
+  array.push(this);
+  return array;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.layer.Layer.prototype.getLayerStatesArray = function(opt_states) {
+  var states = opt_states ? opt_states : [];
+  states.push(this.getLayerState());
+  return states;
+};
+
+
+/**
+ * Get the layer source.
+ * @return {ol.source.Source} The layer source (or `null` if not yet set).
+ * @observable
+ * @api stable
+ */
+ol.layer.Layer.prototype.getSource = function() {
+  var source = this.get(ol.layer.LayerProperty.SOURCE);
+  return /** @type {ol.source.Source} */ (source) || null;
+};
+
+
+/**
+  * @inheritDoc
+  */
+ol.layer.Layer.prototype.getSourceState = function() {
+  var source = this.getSource();
+  return !source ? ol.source.State.UNDEFINED : source.getState();
+};
+
+
+/**
+ * @private
+ */
+ol.layer.Layer.prototype.handleSourceChange_ = function() {
+  this.changed();
+};
+
+
+/**
+ * @private
+ */
+ol.layer.Layer.prototype.handleSourcePropertyChange_ = function() {
+  if (this.sourceChangeKey_) {
+    goog.events.unlistenByKey(this.sourceChangeKey_);
+    this.sourceChangeKey_ = null;
+  }
+  var source = this.getSource();
+  if (source) {
+    this.sourceChangeKey_ = goog.events.listen(source,
+        goog.events.EventType.CHANGE, this.handleSourceChange_, false, this);
+  }
+  this.changed();
+};
+
+
+/**
+ * Sets the layer to be rendered on top of other layers on a map. The map will
+ * not manage this layer in its layers collection, and the callback in
+ * {@link ol.Map#forEachLayerAtPixel} will receive `null` as layer. This
+ * is useful for temporary layers. To remove an unmanaged layer from the map,
+ * use `#setMap(null)`.
+ *
+ * To add the layer to a map and have it managed by the map, use
+ * {@link ol.Map#addLayer} instead.
+ * @param {ol.Map} map Map.
+ * @api
+ */
+ol.layer.Layer.prototype.setMap = function(map) {
+  goog.events.unlistenByKey(this.mapPrecomposeKey_);
+  this.mapPrecomposeKey_ = null;
+  if (!map) {
+    this.changed();
+  }
+  goog.events.unlistenByKey(this.mapRenderKey_);
+  this.mapRenderKey_ = null;
+  if (map) {
+    this.mapPrecomposeKey_ = goog.events.listen(
+        map, ol.render.EventType.PRECOMPOSE, function(evt) {
+          var layerState = this.getLayerState();
+          layerState.managed = false;
+          layerState.zIndex = Infinity;
+          evt.frameState.layerStatesArray.push(layerState);
+          evt.frameState.layerStates[goog.getUid(this)] = layerState;
+        }, false, this);
+    this.mapRenderKey_ = goog.events.listen(
+        this, goog.events.EventType.CHANGE, map.render, false, map);
+    this.changed();
+  }
+};
+
+
+/**
+ * Set the layer source.
+ * @param {ol.source.Source} source The layer source.
+ * @observable
+ * @api stable
+ */
+ol.layer.Layer.prototype.setSource = function(source) {
+  this.set(ol.layer.LayerProperty.SOURCE, source);
+};
+
+goog.provide('ol.ImageBase');
+goog.provide('ol.ImageState');
+
+goog.require('goog.asserts');
+goog.require('goog.events.EventTarget');
+goog.require('goog.events.EventType');
+goog.require('ol.Attribution');
+goog.require('ol.Extent');
+
+
+/**
+ * @enum {number}
+ */
+ol.ImageState = {
+  IDLE: 0,
+  LOADING: 1,
+  LOADED: 2,
+  ERROR: 3
+};
+
+
+
+/**
+ * @constructor
+ * @extends {goog.events.EventTarget}
+ * @param {ol.Extent} extent Extent.
+ * @param {number|undefined} resolution Resolution.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.ImageState} state State.
+ * @param {Array.<ol.Attribution>} attributions Attributions.
+ */
+ol.ImageBase = function(extent, resolution, pixelRatio, state, attributions) {
+
+  goog.base(this);
+
+  /**
+   * @private
+   * @type {Array.<ol.Attribution>}
+   */
+  this.attributions_ = attributions;
+
+  /**
+   * @protected
+   * @type {ol.Extent}
+   */
+  this.extent = extent;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.pixelRatio_ = pixelRatio;
+
+  /**
+   * @protected
+   * @type {number|undefined}
+   */
+  this.resolution = resolution;
+
+  /**
+   * @protected
+   * @type {ol.ImageState}
+   */
+  this.state = state;
+
+};
+goog.inherits(ol.ImageBase, goog.events.EventTarget);
+
+
+/**
+ * @protected
+ */
+ol.ImageBase.prototype.changed = function() {
+  this.dispatchEvent(goog.events.EventType.CHANGE);
+};
+
+
+/**
+ * @return {Array.<ol.Attribution>} Attributions.
+ */
+ol.ImageBase.prototype.getAttributions = function() {
+  return this.attributions_;
+};
+
+
+/**
+ * @return {ol.Extent} Extent.
+ */
+ol.ImageBase.prototype.getExtent = function() {
+  return this.extent;
+};
+
+
+/**
+ * @param {Object=} opt_context Object.
+ * @return {HTMLCanvasElement|Image|HTMLVideoElement} Image.
+ */
+ol.ImageBase.prototype.getImage = goog.abstractMethod;
+
+
+/**
+ * @return {number} PixelRatio.
+ */
+ol.ImageBase.prototype.getPixelRatio = function() {
+  return this.pixelRatio_;
+};
+
+
+/**
+ * @return {number} Resolution.
+ */
+ol.ImageBase.prototype.getResolution = function() {
+  goog.asserts.assert(this.resolution !== undefined, 'resolution not yet set');
+  return this.resolution;
+};
+
+
+/**
+ * @return {ol.ImageState} State.
+ */
+ol.ImageBase.prototype.getState = function() {
+  return this.state;
+};
+
+
+/**
+ * Load not yet loaded URI.
+ */
+ol.ImageBase.prototype.load = goog.abstractMethod;
+
+goog.provide('ol.vec.Mat4');
+goog.provide('ol.vec.Mat4.Number');
+
+goog.require('goog.vec.Mat4');
+
+
+/**
+ * A alias for the goog.vec.Number type.
+ * @typedef {goog.vec.Number}
+ */
+ol.vec.Mat4.Number;
+
+
+/**
+ * @param {!goog.vec.Mat4.Number} mat Matrix.
+ * @param {number} translateX1 Translate X1.
+ * @param {number} translateY1 Translate Y1.
+ * @param {number} scaleX Scale X.
+ * @param {number} scaleY Scale Y.
+ * @param {number} rotation Rotation.
+ * @param {number} translateX2 Translate X2.
+ * @param {number} translateY2 Translate Y2.
+ * @return {!goog.vec.Mat4.Number} Matrix.
+ */
+ol.vec.Mat4.makeTransform2D = function(mat, translateX1, translateY1,
+    scaleX, scaleY, rotation, translateX2, translateY2) {
+  goog.vec.Mat4.makeIdentity(mat);
+  if (translateX1 !== 0 || translateY1 !== 0) {
+    goog.vec.Mat4.translate(mat, translateX1, translateY1, 0);
+  }
+  if (scaleX != 1 || scaleY != 1) {
+    goog.vec.Mat4.scale(mat, scaleX, scaleY, 1);
+  }
+  if (rotation !== 0) {
+    goog.vec.Mat4.rotateZ(mat, rotation);
+  }
+  if (translateX2 !== 0 || translateY2 !== 0) {
+    goog.vec.Mat4.translate(mat, translateX2, translateY2, 0);
+  }
+  return mat;
+};
+
+
+/**
+ * Returns true if mat1 and mat2 represent the same 2D transformation.
+ * @param {goog.vec.Mat4.Number} mat1 Matrix 1.
+ * @param {goog.vec.Mat4.Number} mat2 Matrix 2.
+ * @return {boolean} Equal 2D.
+ */
+ol.vec.Mat4.equals2D = function(mat1, mat2) {
+  return (
+      goog.vec.Mat4.getElement(mat1, 0, 0) ==
+      goog.vec.Mat4.getElement(mat2, 0, 0) &&
+      goog.vec.Mat4.getElement(mat1, 1, 0) ==
+      goog.vec.Mat4.getElement(mat2, 1, 0) &&
+      goog.vec.Mat4.getElement(mat1, 0, 1) ==
+      goog.vec.Mat4.getElement(mat2, 0, 1) &&
+      goog.vec.Mat4.getElement(mat1, 1, 1) ==
+      goog.vec.Mat4.getElement(mat2, 1, 1) &&
+      goog.vec.Mat4.getElement(mat1, 0, 3) ==
+      goog.vec.Mat4.getElement(mat2, 0, 3) &&
+      goog.vec.Mat4.getElement(mat1, 1, 3) ==
+      goog.vec.Mat4.getElement(mat2, 1, 3));
+};
+
+
+/**
+ * Transforms the given vector with the given matrix storing the resulting,
+ * transformed vector into resultVec. The input vector is multiplied against the
+ * upper 2x4 matrix omitting the projective component.
+ *
+ * @param {goog.vec.Mat4.Number} mat The matrix supplying the transformation.
+ * @param {Array.<number>} vec The 3 element vector to transform.
+ * @param {Array.<number>} resultVec The 3 element vector to receive the results
+ *     (may be vec).
+ * @return {Array.<number>} return resultVec so that operations can be
+ *     chained together.
+ */
+ol.vec.Mat4.multVec2 = function(mat, vec, resultVec) {
+  var m00 = goog.vec.Mat4.getElement(mat, 0, 0);
+  var m10 = goog.vec.Mat4.getElement(mat, 1, 0);
+  var m01 = goog.vec.Mat4.getElement(mat, 0, 1);
+  var m11 = goog.vec.Mat4.getElement(mat, 1, 1);
+  var m03 = goog.vec.Mat4.getElement(mat, 0, 3);
+  var m13 = goog.vec.Mat4.getElement(mat, 1, 3);
+  var x = vec[0], y = vec[1];
+  resultVec[0] = m00 * x + m01 * y + m03;
+  resultVec[1] = m10 * x + m11 * y + m13;
+  return resultVec;
+};
+
+goog.provide('ol.renderer.Layer');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('goog.functions');
+goog.require('ol');
+goog.require('ol.ImageState');
+goog.require('ol.Observable');
+goog.require('ol.TileRange');
+goog.require('ol.TileState');
+goog.require('ol.layer.Layer');
+goog.require('ol.source.Source');
+goog.require('ol.source.State');
+goog.require('ol.source.Tile');
+goog.require('ol.tilecoord');
+goog.require('ol.vec.Mat4');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.Observable}
+ * @param {ol.layer.Layer} layer Layer.
+ * @struct
+ */
+ol.renderer.Layer = function(layer) {
+
+  goog.base(this);
+
+  /**
+   * @private
+   * @type {ol.layer.Layer}
+   */
+  this.layer_ = layer;
+
+
+};
+goog.inherits(ol.renderer.Layer, ol.Observable);
+
+
+/**
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {function(this: S, (ol.Feature|ol.render.Feature), ol.layer.Layer): T}
+ *     callback Feature callback.
+ * @param {S} thisArg Value to use as `this` when executing `callback`.
+ * @return {T|undefined} Callback result.
+ * @template S,T
+ */
+ol.renderer.Layer.prototype.forEachFeatureAtCoordinate = ol.nullFunction;
+
+
+/**
+ * @param {ol.Pixel} pixel Pixel.
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {function(this: S, ol.layer.Layer): T} callback Layer callback.
+ * @param {S} thisArg Value to use as `this` when executing `callback`.
+ * @return {T|undefined} Callback result.
+ * @template S,T
+ */
+ol.renderer.Layer.prototype.forEachLayerAtPixel =
+    function(pixel, frameState, callback, thisArg) {
+  var coordinate = pixel.slice();
+  ol.vec.Mat4.multVec2(
+      frameState.pixelToCoordinateMatrix, coordinate, coordinate);
+
+  var hasFeature = this.forEachFeatureAtCoordinate(
+      coordinate, frameState, goog.functions.TRUE, this);
+
+  if (hasFeature) {
+    return callback.call(thisArg, this.layer_);
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {olx.FrameState} frameState Frame state.
+ * @return {boolean} Is there a feature at the given coordinate?
+ */
+ol.renderer.Layer.prototype.hasFeatureAtCoordinate = goog.functions.FALSE;
+
+
+/**
+ * Create a function that adds loaded tiles to the tile lookup.
+ * @param {ol.source.Tile} source Tile source.
+ * @param {ol.proj.Projection} projection Projection of the tiles.
+ * @param {Object.<number, Object.<string, ol.Tile>>} tiles Lookup of loaded
+ *     tiles by zoom level.
+ * @return {function(number, ol.TileRange):boolean} A function that can be
+ *     called with a zoom level and a tile range to add loaded tiles to the
+ *     lookup.
+ * @protected
+ */
+ol.renderer.Layer.prototype.createLoadedTileFinder =
+    function(source, projection, tiles) {
+  return (
+      /**
+       * @param {number} zoom Zoom level.
+       * @param {ol.TileRange} tileRange Tile range.
+       * @return {boolean} The tile range is fully loaded.
+       */
+      function(zoom, tileRange) {
+        return source.forEachLoadedTile(projection, zoom,
+                                        tileRange, function(tile) {
+              if (!tiles[zoom]) {
+                tiles[zoom] = {};
+              }
+              tiles[zoom][tile.tileCoord.toString()] = tile;
+            });
+      });
+};
+
+
+/**
+ * @return {ol.layer.Layer} Layer.
+ */
+ol.renderer.Layer.prototype.getLayer = function() {
+  return this.layer_;
+};
+
+
+/**
+ * Handle changes in image state.
+ * @param {goog.events.Event} event Image change event.
+ * @private
+ */
+ol.renderer.Layer.prototype.handleImageChange_ = function(event) {
+  var image = /** @type {ol.Image} */ (event.target);
+  if (image.getState() === ol.ImageState.LOADED) {
+    this.renderIfReadyAndVisible();
+  }
+};
+
+
+/**
+ * Load the image if not already loaded, and register the image change
+ * listener if needed.
+ * @param {ol.ImageBase} image Image.
+ * @return {boolean} `true` if the image is already loaded, `false`
+ *     otherwise.
+ * @protected
+ */
+ol.renderer.Layer.prototype.loadImage = function(image) {
+  var imageState = image.getState();
+  if (imageState != ol.ImageState.LOADED &&
+      imageState != ol.ImageState.ERROR) {
+    // the image is either "idle" or "loading", register the change
+    // listener (a noop if the listener was already registered)
+    goog.asserts.assert(imageState == ol.ImageState.IDLE ||
+        imageState == ol.ImageState.LOADING,
+        'imageState is "idle" or "loading"');
+    goog.events.listen(image, goog.events.EventType.CHANGE,
+        this.handleImageChange_, false, this);
+  }
+  if (imageState == ol.ImageState.IDLE) {
+    image.load();
+    imageState = image.getState();
+    goog.asserts.assert(imageState == ol.ImageState.LOADING ||
+        imageState == ol.ImageState.LOADED,
+        'imageState is "loading" or "loaded"');
+  }
+  return imageState == ol.ImageState.LOADED;
+};
+
+
+/**
+ * @protected
+ */
+ol.renderer.Layer.prototype.renderIfReadyAndVisible = function() {
+  var layer = this.getLayer();
+  if (layer.getVisible() && layer.getSourceState() == ol.source.State.READY) {
+    this.changed();
+  }
+};
+
+
+/**
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {ol.source.Tile} tileSource Tile source.
+ * @protected
+ */
+ol.renderer.Layer.prototype.scheduleExpireCache =
+    function(frameState, tileSource) {
+  if (tileSource.canExpireCache()) {
+    frameState.postRenderFunctions.push(
+        goog.partial(
+            /**
+             * @param {ol.source.Tile} tileSource Tile source.
+             * @param {ol.Map} map Map.
+             * @param {olx.FrameState} frameState Frame state.
+             */
+            function(tileSource, map, frameState) {
+              var tileSourceKey = goog.getUid(tileSource).toString();
+              tileSource.expireCache(frameState.viewState.projection,
+                                     frameState.usedTiles[tileSourceKey]);
+            }, tileSource));
+  }
+};
+
+
+/**
+ * @param {Object.<string, ol.Attribution>} attributionsSet Attributions
+ *     set (target).
+ * @param {Array.<ol.Attribution>} attributions Attributions (source).
+ * @protected
+ */
+ol.renderer.Layer.prototype.updateAttributions =
+    function(attributionsSet, attributions) {
+  if (attributions) {
+    var attribution, i, ii;
+    for (i = 0, ii = attributions.length; i < ii; ++i) {
+      attribution = attributions[i];
+      attributionsSet[goog.getUid(attribution).toString()] = attribution;
+    }
+  }
+};
+
+
+/**
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {ol.source.Source} source Source.
+ * @protected
+ */
+ol.renderer.Layer.prototype.updateLogos = function(frameState, source) {
+  var logo = source.getLogo();
+  if (logo !== undefined) {
+    if (goog.isString(logo)) {
+      frameState.logos[logo] = '';
+    } else if (goog.isObject(logo)) {
+      goog.asserts.assertString(logo.href, 'logo.href is a string');
+      goog.asserts.assertString(logo.src, 'logo.src is a string');
+      frameState.logos[logo.src] = logo.href;
+    }
+  }
+};
+
+
+/**
+ * @param {Object.<string, Object.<string, ol.TileRange>>} usedTiles Used tiles.
+ * @param {ol.source.Tile} tileSource Tile source.
+ * @param {number} z Z.
+ * @param {ol.TileRange} tileRange Tile range.
+ * @protected
+ */
+ol.renderer.Layer.prototype.updateUsedTiles =
+    function(usedTiles, tileSource, z, tileRange) {
+  // FIXME should we use tilesToDrawByZ instead?
+  var tileSourceKey = goog.getUid(tileSource).toString();
+  var zKey = z.toString();
+  if (tileSourceKey in usedTiles) {
+    if (zKey in usedTiles[tileSourceKey]) {
+      usedTiles[tileSourceKey][zKey].extend(tileRange);
+    } else {
+      usedTiles[tileSourceKey][zKey] = tileRange;
+    }
+  } else {
+    usedTiles[tileSourceKey] = {};
+    usedTiles[tileSourceKey][zKey] = tileRange;
+  }
+};
+
+
+/**
+ * @param {ol.Coordinate} center Center.
+ * @param {number} resolution Resolution.
+ * @param {ol.Size} size Size.
+ * @protected
+ * @return {ol.Coordinate} Snapped center.
+ */
+ol.renderer.Layer.prototype.snapCenterToPixel =
+    function(center, resolution, size) {
+  return [
+    resolution * (Math.round(center[0] / resolution) + (size[0] % 2) / 2),
+    resolution * (Math.round(center[1] / resolution) + (size[1] % 2) / 2)
+  ];
+};
+
+
+/**
+ * Manage tile pyramid.
+ * This function performs a number of functions related to the tiles at the
+ * current zoom and lower zoom levels:
+ * - registers idle tiles in frameState.wantedTiles so that they are not
+ *   discarded by the tile queue
+ * - enqueues missing tiles
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {ol.source.Tile} tileSource Tile source.
+ * @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.proj.Projection} projection Projection.
+ * @param {ol.Extent} extent Extent.
+ * @param {number} currentZ Current Z.
+ * @param {number} preload Load low resolution tiles up to 'preload' levels.
+ * @param {function(this: T, ol.Tile)=} opt_tileCallback Tile callback.
+ * @param {T=} opt_this Object to use as `this` in `opt_tileCallback`.
+ * @protected
+ * @template T
+ */
+ol.renderer.Layer.prototype.manageTilePyramid = function(
+    frameState, tileSource, tileGrid, pixelRatio, projection, extent,
+    currentZ, preload, opt_tileCallback, opt_this) {
+  var tileSourceKey = goog.getUid(tileSource).toString();
+  if (!(tileSourceKey in frameState.wantedTiles)) {
+    frameState.wantedTiles[tileSourceKey] = {};
+  }
+  var wantedTiles = frameState.wantedTiles[tileSourceKey];
+  var tileQueue = frameState.tileQueue;
+  var minZoom = tileGrid.getMinZoom();
+  var tile, tileRange, tileResolution, x, y, z;
+  for (z = currentZ; z >= minZoom; --z) {
+    tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z, tileRange);
+    tileResolution = tileGrid.getResolution(z);
+    for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
+      for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
+        if (currentZ - z <= preload) {
+          tile = tileSource.getTile(z, x, y, pixelRatio, projection);
+          if (tile.getState() == ol.TileState.IDLE) {
+            wantedTiles[ol.tilecoord.toString(tile.tileCoord)] = true;
+            if (!tileQueue.isKeyQueued(tile.getKey())) {
+              tileQueue.enqueue([tile, tileSourceKey,
+                tileGrid.getTileCoordCenter(tile.tileCoord), tileResolution]);
+            }
+          }
+          if (opt_tileCallback !== undefined) {
+            opt_tileCallback.call(opt_this, tile);
+          }
+        } else {
+          tileSource.useTile(z, x, y, projection);
+        }
+      }
+    }
+  }
+};
+
+goog.provide('ol.style.Image');
+goog.provide('ol.style.ImageState');
+
+
+/**
+ * @enum {number}
+ */
+ol.style.ImageState = {
+  IDLE: 0,
+  LOADING: 1,
+  LOADED: 2,
+  ERROR: 3
+};
+
+
+/**
+ * @typedef {{opacity: number,
+ *            rotateWithView: boolean,
+ *            rotation: number,
+ *            scale: number,
+ *            snapToPixel: boolean}}
+ */
+ol.style.ImageOptions;
+
+
+
+/**
+ * @classdesc
+ * A base class used for creating subclasses and not instantiated in
+ * apps. Base class for {@link ol.style.Icon}, {@link ol.style.Circle} and
+ * {@link ol.style.RegularShape}.
+ *
+ * @constructor
+ * @param {ol.style.ImageOptions} options Options.
+ * @api
+ */
+ol.style.Image = function(options) {
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.opacity_ = options.opacity;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.rotateWithView_ = options.rotateWithView;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.rotation_ = options.rotation;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.scale_ = options.scale;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.snapToPixel_ = options.snapToPixel;
+
+};
+
+
+/**
+ * Get the symbolizer opacity.
+ * @return {number} Opacity.
+ * @api
+ */
+ol.style.Image.prototype.getOpacity = function() {
+  return this.opacity_;
+};
+
+
+/**
+ * Determine whether the symbolizer rotates with the map.
+ * @return {boolean} Rotate with map.
+ * @api
+ */
+ol.style.Image.prototype.getRotateWithView = function() {
+  return this.rotateWithView_;
+};
+
+
+/**
+ * Get the symoblizer rotation.
+ * @return {number} Rotation.
+ * @api
+ */
+ol.style.Image.prototype.getRotation = function() {
+  return this.rotation_;
+};
+
+
+/**
+ * Get the symbolizer scale.
+ * @return {number} Scale.
+ * @api
+ */
+ol.style.Image.prototype.getScale = function() {
+  return this.scale_;
+};
+
+
+/**
+ * Determine whether the symbolizer should be snapped to a pixel.
+ * @return {boolean} The symbolizer should snap to a pixel.
+ * @api
+ */
+ol.style.Image.prototype.getSnapToPixel = function() {
+  return this.snapToPixel_;
+};
+
+
+/**
+ * Get the anchor point.  The anchor determines the center point for the
+ * symbolizer.  Its units are determined by `anchorXUnits` and `anchorYUnits`.
+ * @function
+ * @return {Array.<number>} Anchor.
+ */
+ol.style.Image.prototype.getAnchor = goog.abstractMethod;
+
+
+/**
+ * Get the image element for the symbolizer.
+ * @function
+ * @param {number} pixelRatio Pixel ratio.
+ * @return {HTMLCanvasElement|HTMLVideoElement|Image} Image element.
+ */
+ol.style.Image.prototype.getImage = goog.abstractMethod;
+
+
+/**
+ * @param {number} pixelRatio Pixel ratio.
+ * @return {HTMLCanvasElement|HTMLVideoElement|Image} Image element.
+ */
+ol.style.Image.prototype.getHitDetectionImage = goog.abstractMethod;
+
+
+/**
+ * @return {ol.style.ImageState} Image state.
+ */
+ol.style.Image.prototype.getImageState = goog.abstractMethod;
+
+
+/**
+ * @return {ol.Size} Image size.
+ */
+ol.style.Image.prototype.getImageSize = goog.abstractMethod;
+
+
+/**
+ * @return {ol.Size} Size of the hit-detection image.
+ */
+ol.style.Image.prototype.getHitDetectionImageSize = goog.abstractMethod;
+
+
+/**
+ * Get the origin of the symbolizer.
+ * @function
+ * @return {Array.<number>} Origin.
+ */
+ol.style.Image.prototype.getOrigin = goog.abstractMethod;
+
+
+/**
+ * Get the size of the symbolizer (in pixels).
+ * @function
+ * @return {ol.Size} Size.
+ */
+ol.style.Image.prototype.getSize = goog.abstractMethod;
+
+
+/**
+ * Set the opacity.
+ *
+ * @param {number} opacity Opacity.
+ * @api
+ */
+ol.style.Image.prototype.setOpacity = function(opacity) {
+  this.opacity_ = opacity;
+};
+
+
+/**
+ * Set whether to rotate the style with the view.
+ *
+ * @param {boolean} rotateWithView Rotate with map.
+ */
+ol.style.Image.prototype.setRotateWithView = function(rotateWithView) {
+  this.rotateWithView_ = rotateWithView;
+};
+
+
+/**
+ * Set the rotation.
+ *
+ * @param {number} rotation Rotation.
+ * @api
+ */
+ol.style.Image.prototype.setRotation = function(rotation) {
+  this.rotation_ = rotation;
+};
+
+
+/**
+ * Set the scale.
+ *
+ * @param {number} scale Scale.
+ * @api
+ */
+ol.style.Image.prototype.setScale = function(scale) {
+  this.scale_ = scale;
+};
+
+
+/**
+ * Set whether to snap the image to the closest pixel.
+ *
+ * @param {boolean} snapToPixel Snap to pixel?
+ */
+ol.style.Image.prototype.setSnapToPixel = function(snapToPixel) {
+  this.snapToPixel_ = snapToPixel;
+};
+
+
+/**
+ * @param {function(this: T, goog.events.Event)} listener Listener function.
+ * @param {T} thisArg Value to use as `this` when executing `listener`.
+ * @return {goog.events.Key|undefined} Listener key.
+ * @template T
+ */
+ol.style.Image.prototype.listenImageChange = goog.abstractMethod;
+
+
+/**
+ * Load not yet loaded URI.
+ */
+ol.style.Image.prototype.load = goog.abstractMethod;
+
+
+/**
+ * @param {function(this: T, goog.events.Event)} listener Listener function.
+ * @param {T} thisArg Value to use as `this` when executing `listener`.
+ * @template T
+ */
+ol.style.Image.prototype.unlistenImageChange = goog.abstractMethod;
+
+goog.provide('ol.style.Icon');
+goog.provide('ol.style.IconAnchorUnits');
+goog.provide('ol.style.IconImageCache');
+goog.provide('ol.style.IconOrigin');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.EventTarget');
+goog.require('goog.events.EventType');
+goog.require('ol.dom');
+goog.require('ol.style.Image');
+goog.require('ol.style.ImageState');
+
+
+/**
+ * Icon anchor units. One of 'fraction', 'pixels'.
+ * @enum {string}
+ * @api
+ */
+ol.style.IconAnchorUnits = {
+  FRACTION: 'fraction',
+  PIXELS: 'pixels'
+};
+
+
+/**
+ * Icon origin. One of 'bottom-left', 'bottom-right', 'top-left', 'top-right'.
+ * @enum {string}
+ * @api
+ */
+ol.style.IconOrigin = {
+  BOTTOM_LEFT: 'bottom-left',
+  BOTTOM_RIGHT: 'bottom-right',
+  TOP_LEFT: 'top-left',
+  TOP_RIGHT: 'top-right'
+};
+
+
+
+/**
+ * @classdesc
+ * Set icon style for vector features.
+ *
+ * @constructor
+ * @param {olx.style.IconOptions=} opt_options Options.
+ * @extends {ol.style.Image}
+ * @api
+ */
+ol.style.Icon = function(opt_options) {
+
+  var options = opt_options || {};
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.anchor_ = options.anchor !== undefined ? options.anchor : [0.5, 0.5];
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.normalizedAnchor_ = null;
+
+  /**
+   * @private
+   * @type {ol.style.IconOrigin}
+   */
+  this.anchorOrigin_ = options.anchorOrigin !== undefined ?
+      options.anchorOrigin : ol.style.IconOrigin.TOP_LEFT;
+
+  /**
+   * @private
+   * @type {ol.style.IconAnchorUnits}
+   */
+  this.anchorXUnits_ = options.anchorXUnits !== undefined ?
+      options.anchorXUnits : ol.style.IconAnchorUnits.FRACTION;
+
+  /**
+   * @private
+   * @type {ol.style.IconAnchorUnits}
+   */
+  this.anchorYUnits_ = options.anchorYUnits !== undefined ?
+      options.anchorYUnits : ol.style.IconAnchorUnits.FRACTION;
+
+  /**
+   * @type {?string}
+   */
+  var crossOrigin =
+      options.crossOrigin !== undefined ? options.crossOrigin : null;
+
+  /**
+   * @type {Image|HTMLCanvasElement}
+   */
+  var image = options.img !== undefined ? options.img : null;
+
+  /**
+   * @type {ol.Size}
+   */
+  var imgSize = options.imgSize !== undefined ? options.imgSize : null;
+
+  /**
+   * @type {string|undefined}
+   */
+  var src = options.src;
+
+  goog.asserts.assert(!(src !== undefined && image),
+      'image and src can not provided at the same time');
+  goog.asserts.assert(
+      src === undefined || (src !== undefined && !imgSize),
+      'imgSize should not be set when src is provided');
+  goog.asserts.assert(
+      !image || (image && imgSize),
+      'imgSize must be set when image is provided');
+
+  if ((src === undefined || src.length === 0) && image) {
+    src = image.src || goog.getUid(image).toString();
+  }
+  goog.asserts.assert(src !== undefined && src.length > 0,
+      'must provide a defined and non-empty src or image');
+
+  /**
+   * @type {ol.style.ImageState}
+   */
+  var imageState = options.src !== undefined ?
+      ol.style.ImageState.IDLE : ol.style.ImageState.LOADED;
+
+  /**
+   * @private
+   * @type {ol.style.IconImage_}
+   */
+  this.iconImage_ = ol.style.IconImage_.get(
+      image, src, imgSize, crossOrigin, imageState);
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.offset_ = options.offset !== undefined ? options.offset : [0, 0];
+
+  /**
+   * @private
+   * @type {ol.style.IconOrigin}
+   */
+  this.offsetOrigin_ = options.offsetOrigin !== undefined ?
+      options.offsetOrigin : ol.style.IconOrigin.TOP_LEFT;
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.origin_ = null;
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.size_ = options.size !== undefined ? options.size : null;
+
+  /**
+   * @type {number}
+   */
+  var opacity = options.opacity !== undefined ? options.opacity : 1;
+
+  /**
+   * @type {boolean}
+   */
+  var rotateWithView = options.rotateWithView !== undefined ?
+      options.rotateWithView : false;
+
+  /**
+   * @type {number}
+   */
+  var rotation = options.rotation !== undefined ? options.rotation : 0;
+
+  /**
+   * @type {number}
+   */
+  var scale = options.scale !== undefined ? options.scale : 1;
+
+  /**
+   * @type {boolean}
+   */
+  var snapToPixel = options.snapToPixel !== undefined ?
+      options.snapToPixel : true;
+
+  goog.base(this, {
+    opacity: opacity,
+    rotation: rotation,
+    scale: scale,
+    snapToPixel: snapToPixel,
+    rotateWithView: rotateWithView
+  });
+
+};
+goog.inherits(ol.style.Icon, ol.style.Image);
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.style.Icon.prototype.getAnchor = function() {
+  if (this.normalizedAnchor_) {
+    return this.normalizedAnchor_;
+  }
+  var anchor = this.anchor_;
+  var size = this.getSize();
+  if (this.anchorXUnits_ == ol.style.IconAnchorUnits.FRACTION ||
+      this.anchorYUnits_ == ol.style.IconAnchorUnits.FRACTION) {
+    if (!size) {
+      return null;
+    }
+    anchor = this.anchor_.slice();
+    if (this.anchorXUnits_ == ol.style.IconAnchorUnits.FRACTION) {
+      anchor[0] *= size[0];
+    }
+    if (this.anchorYUnits_ == ol.style.IconAnchorUnits.FRACTION) {
+      anchor[1] *= size[1];
+    }
+  }
+
+  if (this.anchorOrigin_ != ol.style.IconOrigin.TOP_LEFT) {
+    if (!size) {
+      return null;
+    }
+    if (anchor === this.anchor_) {
+      anchor = this.anchor_.slice();
+    }
+    if (this.anchorOrigin_ == ol.style.IconOrigin.TOP_RIGHT ||
+        this.anchorOrigin_ == ol.style.IconOrigin.BOTTOM_RIGHT) {
+      anchor[0] = -anchor[0] + size[0];
+    }
+    if (this.anchorOrigin_ == ol.style.IconOrigin.BOTTOM_LEFT ||
+        this.anchorOrigin_ == ol.style.IconOrigin.BOTTOM_RIGHT) {
+      anchor[1] = -anchor[1] + size[1];
+    }
+  }
+  this.normalizedAnchor_ = anchor;
+  return this.normalizedAnchor_;
+};
+
+
+/**
+ * Get the image icon.
+ * @param {number} pixelRatio Pixel ratio.
+ * @return {Image|HTMLCanvasElement} Image or Canvas element.
+ * @api
+ */
+ol.style.Icon.prototype.getImage = function(pixelRatio) {
+  return this.iconImage_.getImage(pixelRatio);
+};
+
+
+/**
+ * Real Image size used.
+ * @return {ol.Size} Size.
+ */
+ol.style.Icon.prototype.getImageSize = function() {
+  return this.iconImage_.getSize();
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Icon.prototype.getHitDetectionImageSize = function() {
+  return this.getImageSize();
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Icon.prototype.getImageState = function() {
+  return this.iconImage_.getImageState();
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Icon.prototype.getHitDetectionImage = function(pixelRatio) {
+  return this.iconImage_.getHitDetectionImage(pixelRatio);
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.style.Icon.prototype.getOrigin = function() {
+  if (this.origin_) {
+    return this.origin_;
+  }
+  var offset = this.offset_;
+
+  if (this.offsetOrigin_ != ol.style.IconOrigin.TOP_LEFT) {
+    var size = this.getSize();
+    var iconImageSize = this.iconImage_.getSize();
+    if (!size || !iconImageSize) {
+      return null;
+    }
+    offset = offset.slice();
+    if (this.offsetOrigin_ == ol.style.IconOrigin.TOP_RIGHT ||
+        this.offsetOrigin_ == ol.style.IconOrigin.BOTTOM_RIGHT) {
+      offset[0] = iconImageSize[0] - size[0] - offset[0];
+    }
+    if (this.offsetOrigin_ == ol.style.IconOrigin.BOTTOM_LEFT ||
+        this.offsetOrigin_ == ol.style.IconOrigin.BOTTOM_RIGHT) {
+      offset[1] = iconImageSize[1] - size[1] - offset[1];
+    }
+  }
+  this.origin_ = offset;
+  return this.origin_;
+};
+
+
+/**
+ * Get the image URL.
+ * @return {string|undefined} Image src.
+ * @api
+ */
+ol.style.Icon.prototype.getSrc = function() {
+  return this.iconImage_.getSrc();
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.style.Icon.prototype.getSize = function() {
+  return !this.size_ ? this.iconImage_.getSize() : this.size_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Icon.prototype.listenImageChange = function(listener, thisArg) {
+  return goog.events.listen(this.iconImage_, goog.events.EventType.CHANGE,
+      listener, false, thisArg);
+};
+
+
+/**
+ * Load not yet loaded URI.
+ * When rendering a feature with an icon style, the vector renderer will
+ * automatically call this method. However, you might want to call this
+ * method yourself for preloading or other purposes.
+ * @api
+ */
+ol.style.Icon.prototype.load = function() {
+  this.iconImage_.load();
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Icon.prototype.unlistenImageChange = function(listener, thisArg) {
+  goog.events.unlisten(this.iconImage_, goog.events.EventType.CHANGE,
+      listener, false, thisArg);
+};
+
+
+
+/**
+ * @constructor
+ * @param {Image|HTMLCanvasElement} image Image.
+ * @param {string|undefined} src Src.
+ * @param {ol.Size} size Size.
+ * @param {?string} crossOrigin Cross origin.
+ * @param {ol.style.ImageState} imageState Image state.
+ * @extends {goog.events.EventTarget}
+ * @private
+ */
+ol.style.IconImage_ = function(image, src, size, crossOrigin, imageState) {
+
+  goog.base(this);
+
+  /**
+   * @private
+   * @type {Image|HTMLCanvasElement}
+   */
+  this.hitDetectionImage_ = null;
+
+  /**
+   * @private
+   * @type {Image|HTMLCanvasElement}
+   */
+  this.image_ = !image ? new Image() : image;
+
+  if (crossOrigin !== null) {
+    this.image_.crossOrigin = crossOrigin;
+  }
+
+  /**
+   * @private
+   * @type {Array.<goog.events.Key>}
+   */
+  this.imageListenerKeys_ = null;
+
+  /**
+   * @private
+   * @type {ol.style.ImageState}
+   */
+  this.imageState_ = imageState;
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.size_ = size;
+
+  /**
+   * @private
+   * @type {string|undefined}
+   */
+  this.src_ = src;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.tainting_ = false;
+  if (this.imageState_ == ol.style.ImageState.LOADED) {
+    this.determineTainting_();
+  }
+
+};
+goog.inherits(ol.style.IconImage_, goog.events.EventTarget);
+
+
+/**
+ * @param {Image|HTMLCanvasElement} image Image.
+ * @param {string} src Src.
+ * @param {ol.Size} size Size.
+ * @param {?string} crossOrigin Cross origin.
+ * @param {ol.style.ImageState} imageState Image state.
+ * @return {ol.style.IconImage_} Icon image.
+ */
+ol.style.IconImage_.get = function(image, src, size, crossOrigin, imageState) {
+  var iconImageCache = ol.style.IconImageCache.getInstance();
+  var iconImage = iconImageCache.get(src, crossOrigin);
+  if (!iconImage) {
+    iconImage = new ol.style.IconImage_(
+        image, src, size, crossOrigin, imageState);
+    iconImageCache.set(src, crossOrigin, iconImage);
+  }
+  return iconImage;
+};
+
+
+/**
+ * @private
+ */
+ol.style.IconImage_.prototype.determineTainting_ = function() {
+  var context = ol.dom.createCanvasContext2D(1, 1);
+  try {
+    context.drawImage(this.image_, 0, 0);
+    context.getImageData(0, 0, 1, 1);
+  } catch (e) {
+    this.tainting_ = true;
+  }
+};
+
+
+/**
+ * @private
+ */
+ol.style.IconImage_.prototype.dispatchChangeEvent_ = function() {
+  this.dispatchEvent(goog.events.EventType.CHANGE);
+};
+
+
+/**
+ * @private
+ */
+ol.style.IconImage_.prototype.handleImageError_ = function() {
+  this.imageState_ = ol.style.ImageState.ERROR;
+  this.unlistenImage_();
+  this.dispatchChangeEvent_();
+};
+
+
+/**
+ * @private
+ */
+ol.style.IconImage_.prototype.handleImageLoad_ = function() {
+  this.imageState_ = ol.style.ImageState.LOADED;
+  this.size_ = [this.image_.width, this.image_.height];
+  this.unlistenImage_();
+  this.determineTainting_();
+  this.dispatchChangeEvent_();
+};
+
+
+/**
+ * @param {number} pixelRatio Pixel ratio.
+ * @return {Image|HTMLCanvasElement} Image or Canvas element.
+ */
+ol.style.IconImage_.prototype.getImage = function(pixelRatio) {
+  return this.image_;
+};
+
+
+/**
+ * @return {ol.style.ImageState} Image state.
+ */
+ol.style.IconImage_.prototype.getImageState = function() {
+  return this.imageState_;
+};
+
+
+/**
+ * @param {number} pixelRatio Pixel ratio.
+ * @return {Image|HTMLCanvasElement} Image element.
+ */
+ol.style.IconImage_.prototype.getHitDetectionImage = function(pixelRatio) {
+  if (!this.hitDetectionImage_) {
+    if (this.tainting_) {
+      var width = this.size_[0];
+      var height = this.size_[1];
+      var context = ol.dom.createCanvasContext2D(width, height);
+      context.fillRect(0, 0, width, height);
+      this.hitDetectionImage_ = context.canvas;
+    } else {
+      this.hitDetectionImage_ = this.image_;
+    }
+  }
+  return this.hitDetectionImage_;
+};
+
+
+/**
+ * @return {ol.Size} Image size.
+ */
+ol.style.IconImage_.prototype.getSize = function() {
+  return this.size_;
+};
+
+
+/**
+ * @return {string|undefined} Image src.
+ */
+ol.style.IconImage_.prototype.getSrc = function() {
+  return this.src_;
+};
+
+
+/**
+ * Load not yet loaded URI.
+ */
+ol.style.IconImage_.prototype.load = function() {
+  if (this.imageState_ == ol.style.ImageState.IDLE) {
+    goog.asserts.assert(this.src_ !== undefined,
+        'this.src_ must not be undefined');
+    goog.asserts.assert(!this.imageListenerKeys_,
+        'no listener keys existing');
+    this.imageState_ = ol.style.ImageState.LOADING;
+    this.imageListenerKeys_ = [
+      goog.events.listenOnce(this.image_, goog.events.EventType.ERROR,
+          this.handleImageError_, false, this),
+      goog.events.listenOnce(this.image_, goog.events.EventType.LOAD,
+          this.handleImageLoad_, false, this)
+    ];
+    try {
+      this.image_.src = this.src_;
+    } catch (e) {
+      this.handleImageError_();
+    }
+  }
+};
+
+
+/**
+ * Discards event handlers which listen for load completion or errors.
+ *
+ * @private
+ */
+ol.style.IconImage_.prototype.unlistenImage_ = function() {
+  goog.asserts.assert(this.imageListenerKeys_,
+      'we must have listeners registered');
+  this.imageListenerKeys_.forEach(goog.events.unlistenByKey);
+  this.imageListenerKeys_ = null;
+};
+
+
+
+/**
+ * @constructor
+ */
+ol.style.IconImageCache = function() {
+
+  /**
+   * @type {Object.<string, ol.style.IconImage_>}
+   * @private
+   */
+  this.cache_ = {};
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.cacheSize_ = 0;
+
+  /**
+   * @const
+   * @type {number}
+   * @private
+   */
+  this.maxCacheSize_ = 32;
+};
+goog.addSingletonGetter(ol.style.IconImageCache);
+
+
+/**
+ * @param {string} src Src.
+ * @param {?string} crossOrigin Cross origin.
+ * @return {string} Cache key.
+ */
+ol.style.IconImageCache.getKey = function(src, crossOrigin) {
+  goog.asserts.assert(crossOrigin !== undefined,
+      'argument crossOrigin must be defined');
+  return crossOrigin + ':' + src;
+};
+
+
+/**
+ * FIXME empty description for jsdoc
+ */
+ol.style.IconImageCache.prototype.clear = function() {
+  this.cache_ = {};
+  this.cacheSize_ = 0;
+};
+
+
+/**
+ * FIXME empty description for jsdoc
+ */
+ol.style.IconImageCache.prototype.expire = function() {
+  if (this.cacheSize_ > this.maxCacheSize_) {
+    var i = 0;
+    var key, iconImage;
+    for (key in this.cache_) {
+      iconImage = this.cache_[key];
+      if ((i++ & 3) === 0 && !goog.events.hasListener(iconImage)) {
+        delete this.cache_[key];
+        --this.cacheSize_;
+      }
+    }
+  }
+};
+
+
+/**
+ * @param {string} src Src.
+ * @param {?string} crossOrigin Cross origin.
+ * @return {ol.style.IconImage_} Icon image.
+ */
+ol.style.IconImageCache.prototype.get = function(src, crossOrigin) {
+  var key = ol.style.IconImageCache.getKey(src, crossOrigin);
+  return key in this.cache_ ? this.cache_[key] : null;
+};
+
+
+/**
+ * @param {string} src Src.
+ * @param {?string} crossOrigin Cross origin.
+ * @param {ol.style.IconImage_} iconImage Icon image.
+ */
+ol.style.IconImageCache.prototype.set = function(src, crossOrigin, iconImage) {
+  var key = ol.style.IconImageCache.getKey(src, crossOrigin);
+  this.cache_[key] = iconImage;
+  ++this.cacheSize_;
+};
+
+goog.provide('ol.RendererType');
+goog.provide('ol.renderer.Map');
+
+goog.require('goog.Disposable');
+goog.require('goog.asserts');
+goog.require('goog.dispose');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('goog.functions');
+goog.require('goog.object');
+goog.require('goog.vec.Mat4');
+goog.require('ol');
+goog.require('ol.extent');
+goog.require('ol.layer.Layer');
+goog.require('ol.renderer.Layer');
+goog.require('ol.style.IconImageCache');
+goog.require('ol.vec.Mat4');
+
+
+/**
+ * Available renderers: `'canvas'`, `'dom'` or `'webgl'`.
+ * @enum {string}
+ * @api stable
+ */
+ol.RendererType = {
+  CANVAS: 'canvas',
+  DOM: 'dom',
+  WEBGL: 'webgl'
+};
+
+
+
+/**
+ * @constructor
+ * @extends {goog.Disposable}
+ * @param {Element} container Container.
+ * @param {ol.Map} map Map.
+ * @struct
+ */
+ol.renderer.Map = function(container, map) {
+
+  goog.base(this);
+
+
+  /**
+   * @private
+   * @type {ol.Map}
+   */
+  this.map_ = map;
+
+  /**
+   * @private
+   * @type {Object.<string, ol.renderer.Layer>}
+   */
+  this.layerRenderers_ = {};
+
+  /**
+   * @private
+   * @type {Object.<string, goog.events.Key>}
+   */
+  this.layerRendererListeners_ = {};
+
+};
+goog.inherits(ol.renderer.Map, goog.Disposable);
+
+
+/**
+ * @param {olx.FrameState} frameState FrameState.
+ * @protected
+ */
+ol.renderer.Map.prototype.calculateMatrices2D = function(frameState) {
+  var viewState = frameState.viewState;
+  var coordinateToPixelMatrix = frameState.coordinateToPixelMatrix;
+  goog.asserts.assert(coordinateToPixelMatrix,
+      'frameState has a coordinateToPixelMatrix');
+  ol.vec.Mat4.makeTransform2D(coordinateToPixelMatrix,
+      frameState.size[0] / 2, frameState.size[1] / 2,
+      1 / viewState.resolution, -1 / viewState.resolution,
+      -viewState.rotation,
+      -viewState.center[0], -viewState.center[1]);
+  var inverted = goog.vec.Mat4.invert(
+      coordinateToPixelMatrix, frameState.pixelToCoordinateMatrix);
+  goog.asserts.assert(inverted, 'matrix could be inverted');
+};
+
+
+/**
+ * @param {ol.layer.Layer} layer Layer.
+ * @protected
+ * @return {ol.renderer.Layer} layerRenderer Layer renderer.
+ */
+ol.renderer.Map.prototype.createLayerRenderer = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.Map.prototype.disposeInternal = function() {
+  goog.object.forEach(this.layerRenderers_, goog.dispose);
+  goog.base(this, 'disposeInternal');
+};
+
+
+/**
+ * @param {ol.Map} map Map.
+ * @param {olx.FrameState} frameState Frame state.
+ * @private
+ */
+ol.renderer.Map.expireIconCache_ = function(map, frameState) {
+  ol.style.IconImageCache.getInstance().expire();
+};
+
+
+/**
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {olx.FrameState} frameState FrameState.
+ * @param {function(this: S, (ol.Feature|ol.render.Feature),
+ *     ol.layer.Layer): T} callback Feature callback.
+ * @param {S} thisArg Value to use as `this` when executing `callback`.
+ * @param {function(this: U, ol.layer.Layer): boolean} layerFilter Layer filter
+ *     function, only layers which are visible and for which this function
+ *     returns `true` will be tested for features.  By default, all visible
+ *     layers will be tested.
+ * @param {U} thisArg2 Value to use as `this` when executing `layerFilter`.
+ * @return {T|undefined} Callback result.
+ * @template S,T,U
+ */
+ol.renderer.Map.prototype.forEachFeatureAtCoordinate =
+    function(coordinate, frameState, callback, thisArg,
+        layerFilter, thisArg2) {
+  var result;
+  var viewState = frameState.viewState;
+  var viewResolution = viewState.resolution;
+
+  /** @type {Object.<string, boolean>} */
+  var features = {};
+
+  /**
+   * @param {ol.Feature|ol.render.Feature} feature Feature.
+   * @return {?} Callback result.
+   */
+  function forEachFeatureAtCoordinate(feature) {
+    goog.asserts.assert(feature !== undefined, 'received a feature');
+    var key = goog.getUid(feature).toString();
+    if (!(key in features)) {
+      features[key] = true;
+      return callback.call(thisArg, feature, null);
+    }
+  }
+
+  var projection = viewState.projection;
+
+  var translatedCoordinate = coordinate;
+  if (projection.canWrapX()) {
+    var projectionExtent = projection.getExtent();
+    var worldWidth = ol.extent.getWidth(projectionExtent);
+    var x = coordinate[0];
+    if (x < projectionExtent[0] || x > projectionExtent[2]) {
+      var worldsAway = Math.ceil((projectionExtent[0] - x) / worldWidth);
+      translatedCoordinate = [x + worldWidth * worldsAway, coordinate[1]];
+    }
+  }
+
+  var layerStates = frameState.layerStatesArray;
+  var numLayers = layerStates.length;
+  var i;
+  for (i = numLayers - 1; i >= 0; --i) {
+    var layerState = layerStates[i];
+    var layer = layerState.layer;
+    if (ol.layer.Layer.visibleAtResolution(layerState, viewResolution) &&
+        layerFilter.call(thisArg2, layer)) {
+      var layerRenderer = this.getLayerRenderer(layer);
+      if (layer.getSource()) {
+        result = layerRenderer.forEachFeatureAtCoordinate(
+            layer.getSource().getWrapX() ? translatedCoordinate : coordinate,
+            frameState,
+            layerState.managed ? callback : forEachFeatureAtCoordinate,
+            thisArg);
+      }
+      if (result) {
+        return result;
+      }
+    }
+  }
+  return undefined;
+};
+
+
+/**
+ * @param {ol.Pixel} pixel Pixel.
+ * @param {olx.FrameState} frameState FrameState.
+ * @param {function(this: S, ol.layer.Layer): T} callback Layer
+ *     callback.
+ * @param {S} thisArg Value to use as `this` when executing `callback`.
+ * @param {function(this: U, ol.layer.Layer): boolean} layerFilter Layer filter
+ *     function, only layers which are visible and for which this function
+ *     returns `true` will be tested for features.  By default, all visible
+ *     layers will be tested.
+ * @param {U} thisArg2 Value to use as `this` when executing `layerFilter`.
+ * @return {T|undefined} Callback result.
+ * @template S,T,U
+ */
+ol.renderer.Map.prototype.forEachLayerAtPixel =
+    function(pixel, frameState, callback, thisArg,
+        layerFilter, thisArg2) {
+  var result;
+  var viewState = frameState.viewState;
+  var viewResolution = viewState.resolution;
+
+  var layerStates = frameState.layerStatesArray;
+  var numLayers = layerStates.length;
+  var i;
+  for (i = numLayers - 1; i >= 0; --i) {
+    var layerState = layerStates[i];
+    var layer = layerState.layer;
+    if (ol.layer.Layer.visibleAtResolution(layerState, viewResolution) &&
+        layerFilter.call(thisArg2, layer)) {
+      var layerRenderer = this.getLayerRenderer(layer);
+      result = layerRenderer.forEachLayerAtPixel(
+          pixel, frameState, callback, thisArg);
+      if (result) {
+        return result;
+      }
+    }
+  }
+  return undefined;
+};
+
+
+/**
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {olx.FrameState} frameState FrameState.
+ * @param {function(this: U, ol.layer.Layer): boolean} layerFilter Layer filter
+ *     function, only layers which are visible and for which this function
+ *     returns `true` will be tested for features.  By default, all visible
+ *     layers will be tested.
+ * @param {U} thisArg Value to use as `this` when executing `layerFilter`.
+ * @return {boolean} Is there a feature at the given coordinate?
+ * @template U
+ */
+ol.renderer.Map.prototype.hasFeatureAtCoordinate =
+    function(coordinate, frameState, layerFilter, thisArg) {
+  var hasFeature = this.forEachFeatureAtCoordinate(
+      coordinate, frameState, goog.functions.TRUE, this, layerFilter, thisArg);
+
+  return hasFeature !== undefined;
+};
+
+
+/**
+ * @param {ol.layer.Layer} layer Layer.
+ * @protected
+ * @return {ol.renderer.Layer} Layer renderer.
+ */
+ol.renderer.Map.prototype.getLayerRenderer = function(layer) {
+  var layerKey = goog.getUid(layer).toString();
+  if (layerKey in this.layerRenderers_) {
+    return this.layerRenderers_[layerKey];
+  } else {
+    var layerRenderer = this.createLayerRenderer(layer);
+    this.layerRenderers_[layerKey] = layerRenderer;
+    this.layerRendererListeners_[layerKey] = goog.events.listen(layerRenderer,
+        goog.events.EventType.CHANGE, this.handleLayerRendererChange_,
+        false, this);
+
+    return layerRenderer;
+  }
+};
+
+
+/**
+ * @param {string} layerKey Layer key.
+ * @protected
+ * @return {ol.renderer.Layer} Layer renderer.
+ */
+ol.renderer.Map.prototype.getLayerRendererByKey = function(layerKey) {
+  goog.asserts.assert(layerKey in this.layerRenderers_,
+      'given layerKey (%s) exists in layerRenderers', layerKey);
+  return this.layerRenderers_[layerKey];
+};
+
+
+/**
+ * @protected
+ * @return {Object.<number, ol.renderer.Layer>} Layer renderers.
+ */
+ol.renderer.Map.prototype.getLayerRenderers = function() {
+  return this.layerRenderers_;
+};
+
+
+/**
+ * @return {ol.Map} Map.
+ */
+ol.renderer.Map.prototype.getMap = function() {
+  return this.map_;
+};
+
+
+/**
+ * @return {string} Type
+ */
+ol.renderer.Map.prototype.getType = goog.abstractMethod;
+
+
+/**
+ * Handle changes in a layer renderer.
+ * @private
+ */
+ol.renderer.Map.prototype.handleLayerRendererChange_ = function() {
+  this.map_.render();
+};
+
+
+/**
+ * @param {string} layerKey Layer key.
+ * @return {ol.renderer.Layer} Layer renderer.
+ * @private
+ */
+ol.renderer.Map.prototype.removeLayerRendererByKey_ = function(layerKey) {
+  goog.asserts.assert(layerKey in this.layerRenderers_,
+      'given layerKey (%s) exists in layerRenderers', layerKey);
+  var layerRenderer = this.layerRenderers_[layerKey];
+  delete this.layerRenderers_[layerKey];
+
+  goog.asserts.assert(layerKey in this.layerRendererListeners_,
+      'given layerKey (%s) exists in layerRendererListeners', layerKey);
+  goog.events.unlistenByKey(this.layerRendererListeners_[layerKey]);
+  delete this.layerRendererListeners_[layerKey];
+
+  return layerRenderer;
+};
+
+
+/**
+ * Render.
+ * @param {?olx.FrameState} frameState Frame state.
+ */
+ol.renderer.Map.prototype.renderFrame = ol.nullFunction;
+
+
+/**
+ * @param {ol.Map} map Map.
+ * @param {olx.FrameState} frameState Frame state.
+ * @private
+ */
+ol.renderer.Map.prototype.removeUnusedLayerRenderers_ =
+    function(map, frameState) {
+  var layerKey;
+  for (layerKey in this.layerRenderers_) {
+    if (!frameState || !(layerKey in frameState.layerStates)) {
+      goog.dispose(this.removeLayerRendererByKey_(layerKey));
+    }
+  }
+};
+
+
+/**
+ * @param {olx.FrameState} frameState Frame state.
+ * @protected
+ */
+ol.renderer.Map.prototype.scheduleExpireIconCache = function(frameState) {
+  frameState.postRenderFunctions.push(ol.renderer.Map.expireIconCache_);
+};
+
+
+/**
+ * @param {!olx.FrameState} frameState Frame state.
+ * @protected
+ */
+ol.renderer.Map.prototype.scheduleRemoveUnusedLayerRenderers =
+    function(frameState) {
+  var layerKey;
+  for (layerKey in this.layerRenderers_) {
+    if (!(layerKey in frameState.layerStates)) {
+      frameState.postRenderFunctions.push(
+          goog.bind(this.removeUnusedLayerRenderers_, this));
+      return;
+    }
+  }
+};
+
+
+/**
+ * @param {ol.layer.LayerState} state1
+ * @param {ol.layer.LayerState} state2
+ * @return {number}
+ */
+ol.renderer.Map.sortByZIndex = function(state1, state2) {
+  return state1.zIndex - state2.zIndex;
+};
+
+goog.provide('ol.structs.PriorityQueue');
+
+goog.require('goog.asserts');
+goog.require('goog.object');
+
+
+
+/**
+ * Priority queue.
+ *
+ * The implementation is inspired from the Closure Library's Heap class and
+ * Python's heapq module.
+ *
+ * @see http://closure-library.googlecode.com/svn/docs/closure_goog_structs_heap.js.source.html
+ * @see http://hg.python.org/cpython/file/2.7/Lib/heapq.py
+ *
+ * @constructor
+ * @param {function(T): number} priorityFunction Priority function.
+ * @param {function(T): string} keyFunction Key function.
+ * @struct
+ * @template T
+ */
+ol.structs.PriorityQueue = function(priorityFunction, keyFunction) {
+
+  /**
+   * @type {function(T): number}
+   * @private
+   */
+  this.priorityFunction_ = priorityFunction;
+
+  /**
+   * @type {function(T): string}
+   * @private
+   */
+  this.keyFunction_ = keyFunction;
+
+  /**
+   * @type {Array.<T>}
+   * @private
+   */
+  this.elements_ = [];
+
+  /**
+   * @type {Array.<number>}
+   * @private
+   */
+  this.priorities_ = [];
+
+  /**
+   * @type {Object.<string, boolean>}
+   * @private
+   */
+  this.queuedElements_ = {};
+
+};
+
+
+/**
+ * @const
+ * @type {number}
+ */
+ol.structs.PriorityQueue.DROP = Infinity;
+
+
+/**
+ * FIXME empty description for jsdoc
+ */
+ol.structs.PriorityQueue.prototype.assertValid = function() {
+  var elements = this.elements_;
+  var priorities = this.priorities_;
+  var n = elements.length;
+  goog.asserts.assert(priorities.length == n);
+  var i, priority;
+  for (i = 0; i < (n >> 1) - 1; ++i) {
+    priority = priorities[i];
+    goog.asserts.assert(priority <= priorities[this.getLeftChildIndex_(i)],
+        'priority smaller than or equal to priority of left child (%s <= %s)',
+        priority, priorities[this.getLeftChildIndex_(i)]);
+    goog.asserts.assert(priority <= priorities[this.getRightChildIndex_(i)],
+        'priority smaller than or equal to priority of right child (%s <= %s)',
+        priority, priorities[this.getRightChildIndex_(i)]);
+  }
+};
+
+
+/**
+ * FIXME empty description for jsdoc
+ */
+ol.structs.PriorityQueue.prototype.clear = function() {
+  this.elements_.length = 0;
+  this.priorities_.length = 0;
+  goog.object.clear(this.queuedElements_);
+};
+
+
+/**
+ * Remove and return the highest-priority element. O(log N).
+ * @return {T} Element.
+ */
+ol.structs.PriorityQueue.prototype.dequeue = function() {
+  var elements = this.elements_;
+  goog.asserts.assert(elements.length > 0,
+      'must have elements in order to be able to dequeue');
+  var priorities = this.priorities_;
+  var element = elements[0];
+  if (elements.length == 1) {
+    elements.length = 0;
+    priorities.length = 0;
+  } else {
+    elements[0] = elements.pop();
+    priorities[0] = priorities.pop();
+    this.siftUp_(0);
+  }
+  var elementKey = this.keyFunction_(element);
+  goog.asserts.assert(elementKey in this.queuedElements_,
+      'key %s is not listed as queued', elementKey);
+  delete this.queuedElements_[elementKey];
+  return element;
+};
+
+
+/**
+ * Enqueue an element. O(log N).
+ * @param {T} element Element.
+ * @return {boolean} The element was added to the queue.
+ */
+ol.structs.PriorityQueue.prototype.enqueue = function(element) {
+  goog.asserts.assert(!(this.keyFunction_(element) in this.queuedElements_),
+      'key %s is already listed as queued', this.keyFunction_(element));
+  var priority = this.priorityFunction_(element);
+  if (priority != ol.structs.PriorityQueue.DROP) {
+    this.elements_.push(element);
+    this.priorities_.push(priority);
+    this.queuedElements_[this.keyFunction_(element)] = true;
+    this.siftDown_(0, this.elements_.length - 1);
+    return true;
+  }
+  return false;
+};
+
+
+/**
+ * @return {number} Count.
+ */
+ol.structs.PriorityQueue.prototype.getCount = function() {
+  return this.elements_.length;
+};
+
+
+/**
+ * Gets the index of the left child of the node at the given index.
+ * @param {number} index The index of the node to get the left child for.
+ * @return {number} The index of the left child.
+ * @private
+ */
+ol.structs.PriorityQueue.prototype.getLeftChildIndex_ = function(index) {
+  return index * 2 + 1;
+};
+
+
+/**
+ * Gets the index of the right child of the node at the given index.
+ * @param {number} index The index of the node to get the right child for.
+ * @return {number} The index of the right child.
+ * @private
+ */
+ol.structs.PriorityQueue.prototype.getRightChildIndex_ = function(index) {
+  return index * 2 + 2;
+};
+
+
+/**
+ * Gets the index of the parent of the node at the given index.
+ * @param {number} index The index of the node to get the parent for.
+ * @return {number} The index of the parent.
+ * @private
+ */
+ol.structs.PriorityQueue.prototype.getParentIndex_ = function(index) {
+  return (index - 1) >> 1;
+};
+
+
+/**
+ * Make this a heap. O(N).
+ * @private
+ */
+ol.structs.PriorityQueue.prototype.heapify_ = function() {
+  var i;
+  for (i = (this.elements_.length >> 1) - 1; i >= 0; i--) {
+    this.siftUp_(i);
+  }
+};
+
+
+/**
+ * @return {boolean} Is empty.
+ */
+ol.structs.PriorityQueue.prototype.isEmpty = function() {
+  return this.elements_.length === 0;
+};
+
+
+/**
+ * @param {string} key Key.
+ * @return {boolean} Is key queued.
+ */
+ol.structs.PriorityQueue.prototype.isKeyQueued = function(key) {
+  return key in this.queuedElements_;
+};
+
+
+/**
+ * @param {T} element Element.
+ * @return {boolean} Is queued.
+ */
+ol.structs.PriorityQueue.prototype.isQueued = function(element) {
+  return this.isKeyQueued(this.keyFunction_(element));
+};
+
+
+/**
+ * @param {number} index The index of the node to move down.
+ * @private
+ */
+ol.structs.PriorityQueue.prototype.siftUp_ = function(index) {
+  var elements = this.elements_;
+  var priorities = this.priorities_;
+  var count = elements.length;
+  var element = elements[index];
+  var priority = priorities[index];
+  var startIndex = index;
+
+  while (index < (count >> 1)) {
+    var lIndex = this.getLeftChildIndex_(index);
+    var rIndex = this.getRightChildIndex_(index);
+
+    var smallerChildIndex = rIndex < count &&
+        priorities[rIndex] < priorities[lIndex] ?
+        rIndex : lIndex;
+
+    elements[index] = elements[smallerChildIndex];
+    priorities[index] = priorities[smallerChildIndex];
+    index = smallerChildIndex;
+  }
+
+  elements[index] = element;
+  priorities[index] = priority;
+  this.siftDown_(startIndex, index);
+};
+
+
+/**
+ * @param {number} startIndex The index of the root.
+ * @param {number} index The index of the node to move up.
+ * @private
+ */
+ol.structs.PriorityQueue.prototype.siftDown_ = function(startIndex, index) {
+  var elements = this.elements_;
+  var priorities = this.priorities_;
+  var element = elements[index];
+  var priority = priorities[index];
+
+  while (index > startIndex) {
+    var parentIndex = this.getParentIndex_(index);
+    if (priorities[parentIndex] > priority) {
+      elements[index] = elements[parentIndex];
+      priorities[index] = priorities[parentIndex];
+      index = parentIndex;
+    } else {
+      break;
+    }
+  }
+  elements[index] = element;
+  priorities[index] = priority;
+};
+
+
+/**
+ * FIXME empty description for jsdoc
+ */
+ol.structs.PriorityQueue.prototype.reprioritize = function() {
+  var priorityFunction = this.priorityFunction_;
+  var elements = this.elements_;
+  var priorities = this.priorities_;
+  var index = 0;
+  var n = elements.length;
+  var element, i, priority;
+  for (i = 0; i < n; ++i) {
+    element = elements[i];
+    priority = priorityFunction(element);
+    if (priority == ol.structs.PriorityQueue.DROP) {
+      delete this.queuedElements_[this.keyFunction_(element)];
+    } else {
+      priorities[index] = priority;
+      elements[index++] = element;
+    }
+  }
+  elements.length = index;
+  priorities.length = index;
+  this.heapify_();
+};
+
+goog.provide('ol.TilePriorityFunction');
+goog.provide('ol.TileQueue');
+
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('ol.Coordinate');
+goog.require('ol.TileState');
+goog.require('ol.structs.PriorityQueue');
+
+
+/**
+ * @typedef {function(ol.Tile, string, ol.Coordinate, number): number}
+ */
+ol.TilePriorityFunction;
+
+
+
+/**
+ * @constructor
+ * @extends {ol.structs.PriorityQueue.<Array>}
+ * @param {ol.TilePriorityFunction} tilePriorityFunction
+ *     Tile priority function.
+ * @param {function(): ?} tileChangeCallback
+ *     Function called on each tile change event.
+ * @struct
+ */
+ol.TileQueue = function(tilePriorityFunction, tileChangeCallback) {
+
+  goog.base(
+      this,
+      /**
+       * @param {Array} element Element.
+       * @return {number} Priority.
+       */
+      function(element) {
+        return tilePriorityFunction.apply(null, element);
+      },
+      /**
+       * @param {Array} element Element.
+       * @return {string} Key.
+       */
+      function(element) {
+        return /** @type {ol.Tile} */ (element[0]).getKey();
+      });
+
+  /**
+   * @private
+   * @type {function(): ?}
+   */
+  this.tileChangeCallback_ = tileChangeCallback;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.tilesLoading_ = 0;
+
+  /**
+   * @private
+   * @type {Object.<string,boolean>}
+   */
+  this.tilesLoadingKeys_ = {};
+
+};
+goog.inherits(ol.TileQueue, ol.structs.PriorityQueue);
+
+
+/**
+ * @inheritDoc
+ */
+ol.TileQueue.prototype.enqueue = function(element) {
+  var added = goog.base(this, 'enqueue', element);
+  if (added) {
+    var tile = element[0];
+    goog.events.listen(tile, goog.events.EventType.CHANGE,
+        this.handleTileChange, false, this);
+  }
+  return added;
+};
+
+
+/**
+ * @return {number} Number of tiles loading.
+ */
+ol.TileQueue.prototype.getTilesLoading = function() {
+  return this.tilesLoading_;
+};
+
+
+/**
+ * @param {goog.events.Event} event Event.
+ * @protected
+ */
+ol.TileQueue.prototype.handleTileChange = function(event) {
+  var tile = /** @type {ol.Tile} */ (event.target);
+  var state = tile.getState();
+  if (state === ol.TileState.LOADED || state === ol.TileState.ERROR ||
+      state === ol.TileState.EMPTY) {
+    goog.events.unlisten(tile, goog.events.EventType.CHANGE,
+        this.handleTileChange, false, this);
+    var tileKey = tile.getKey();
+    if (tileKey in this.tilesLoadingKeys_) {
+      delete this.tilesLoadingKeys_[tileKey];
+      --this.tilesLoading_;
+    }
+    this.tileChangeCallback_();
+  }
+};
+
+
+/**
+ * @param {number} maxTotalLoading Maximum number tiles to load simultaneously.
+ * @param {number} maxNewLoads Maximum number of new tiles to load.
+ */
+ol.TileQueue.prototype.loadMoreTiles = function(maxTotalLoading, maxNewLoads) {
+  var newLoads = 0;
+  var tile;
+  while (this.tilesLoading_ < maxTotalLoading && newLoads < maxNewLoads &&
+         this.getCount() > 0) {
+    tile = /** @type {ol.Tile} */ (this.dequeue()[0]);
+    if (tile.getState() === ol.TileState.IDLE) {
+      tile.load();
+      this.tilesLoadingKeys_[tile.getKey()] = true;
+      ++this.tilesLoading_;
+      ++newLoads;
+    }
+  }
+};
+
+goog.provide('ol.Kinetic');
+
+goog.require('ol.Coordinate');
+goog.require('ol.PreRenderFunction');
+goog.require('ol.animation');
+
+
+
+/**
+ * @classdesc
+ * Implementation of inertial deceleration for map movement.
+ *
+ * @constructor
+ * @param {number} decay Rate of decay (must be negative).
+ * @param {number} minVelocity Minimum velocity (pixels/millisecond).
+ * @param {number} delay Delay to consider to calculate the kinetic
+ *     initial values (milliseconds).
+ * @struct
+ * @api
+ */
+ol.Kinetic = function(decay, minVelocity, delay) {
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.decay_ = decay;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.minVelocity_ = minVelocity;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.delay_ = delay;
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.points_ = [];
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.angle_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.initialVelocity_ = 0;
+};
+
+
+/**
+ * FIXME empty description for jsdoc
+ */
+ol.Kinetic.prototype.begin = function() {
+  this.points_.length = 0;
+  this.angle_ = 0;
+  this.initialVelocity_ = 0;
+};
+
+
+/**
+ * @param {number} x X.
+ * @param {number} y Y.
+ */
+ol.Kinetic.prototype.update = function(x, y) {
+  this.points_.push(x, y, Date.now());
+};
+
+
+/**
+ * @return {boolean} Whether we should do kinetic animation.
+ */
+ol.Kinetic.prototype.end = function() {
+  if (this.points_.length < 6) {
+    // at least 2 points are required (i.e. there must be at least 6 elements
+    // in the array)
+    return false;
+  }
+  var delay = Date.now() - this.delay_;
+  var lastIndex = this.points_.length - 3;
+  if (this.points_[lastIndex + 2] < delay) {
+    // the last tracked point is too old, which means that the user stopped
+    // panning before releasing the map
+    return false;
+  }
+
+  // get the first point which still falls into the delay time
+  var firstIndex = lastIndex - 3;
+  while (firstIndex > 0 && this.points_[firstIndex + 2] > delay) {
+    firstIndex -= 3;
+  }
+  var duration = this.points_[lastIndex + 2] - this.points_[firstIndex + 2];
+  var dx = this.points_[lastIndex] - this.points_[firstIndex];
+  var dy = this.points_[lastIndex + 1] - this.points_[firstIndex + 1];
+  this.angle_ = Math.atan2(dy, dx);
+  this.initialVelocity_ = Math.sqrt(dx * dx + dy * dy) / duration;
+  return this.initialVelocity_ > this.minVelocity_;
+};
+
+
+/**
+ * @param {ol.Coordinate} source Source coordinate for the animation.
+ * @return {ol.PreRenderFunction} Pre-render function for kinetic animation.
+ */
+ol.Kinetic.prototype.pan = function(source) {
+  var decay = this.decay_;
+  var initialVelocity = this.initialVelocity_;
+  var velocity = this.minVelocity_ - initialVelocity;
+  var duration = this.getDuration_();
+  var easingFunction = (
+      /**
+       * @param {number} t T.
+       * @return {number} Easing.
+       */
+      function(t) {
+        return initialVelocity * (Math.exp((decay * t) * duration) - 1) /
+            velocity;
+      });
+  return ol.animation.pan({
+    source: source,
+    duration: duration,
+    easing: easingFunction
+  });
+};
+
+
+/**
+ * @private
+ * @return {number} Duration of animation (milliseconds).
+ */
+ol.Kinetic.prototype.getDuration_ = function() {
+  return Math.log(this.minVelocity_ / this.initialVelocity_) / this.decay_;
+};
+
+
+/**
+ * @return {number} Total distance travelled (pixels).
+ */
+ol.Kinetic.prototype.getDistance = function() {
+  return (this.minVelocity_ - this.initialVelocity_) / this.decay_;
+};
+
+
+/**
+ * @return {number} Angle of the kinetic panning animation (radians).
+ */
+ol.Kinetic.prototype.getAngle = function() {
+  return this.angle_;
+};
+
+// FIXME factor out key precondition (shift et. al)
+
+goog.provide('ol.interaction.Interaction');
+goog.provide('ol.interaction.InteractionProperty');
+
+goog.require('ol');
+goog.require('ol.MapBrowserEvent');
+goog.require('ol.Object');
+goog.require('ol.animation');
+goog.require('ol.easing');
+
+
+/**
+ * @enum {string}
+ */
+ol.interaction.InteractionProperty = {
+  ACTIVE: 'active'
+};
+
+
+
+/**
+ * @classdesc
+ * Abstract base class; normally only used for creating subclasses and not
+ * instantiated in apps.
+ * User actions that change the state of the map. Some are similar to controls,
+ * but are not associated with a DOM element.
+ * For example, {@link ol.interaction.KeyboardZoom} is functionally the same as
+ * {@link ol.control.Zoom}, but triggered by a keyboard event not a button
+ * element event.
+ * Although interactions do not have a DOM element, some of them do render
+ * vectors and so are visible on the screen.
+ *
+ * @constructor
+ * @param {olx.interaction.InteractionOptions} options Options.
+ * @extends {ol.Object}
+ * @api
+ */
+ol.interaction.Interaction = function(options) {
+
+  goog.base(this);
+
+  /**
+   * @private
+   * @type {ol.Map}
+   */
+  this.map_ = null;
+
+  this.setActive(true);
+
+  /**
+   * @type {function(ol.MapBrowserEvent):boolean}
+   */
+  this.handleEvent = options.handleEvent;
+
+};
+goog.inherits(ol.interaction.Interaction, ol.Object);
+
+
+/**
+ * Return whether the interaction is currently active.
+ * @return {boolean} `true` if the interaction is active, `false` otherwise.
+ * @observable
+ * @api
+ */
+ol.interaction.Interaction.prototype.getActive = function() {
+  return /** @type {boolean} */ (
+      this.get(ol.interaction.InteractionProperty.ACTIVE));
+};
+
+
+/**
+ * Get the map associated with this interaction.
+ * @return {ol.Map} Map.
+ * @api
+ */
+ol.interaction.Interaction.prototype.getMap = function() {
+  return this.map_;
+};
+
+
+/**
+ * Activate or deactivate the interaction.
+ * @param {boolean} active Active.
+ * @observable
+ * @api
+ */
+ol.interaction.Interaction.prototype.setActive = function(active) {
+  this.set(ol.interaction.InteractionProperty.ACTIVE, active);
+};
+
+
+/**
+ * Remove the interaction from its current map and attach it to the new map.
+ * Subclasses may set up event handlers to get notified about changes to
+ * the map here.
+ * @param {ol.Map} map Map.
+ */
+ol.interaction.Interaction.prototype.setMap = function(map) {
+  this.map_ = map;
+};
+
+
+/**
+ * @param {ol.Map} map Map.
+ * @param {ol.View} view View.
+ * @param {ol.Coordinate} delta Delta.
+ * @param {number=} opt_duration Duration.
+ */
+ol.interaction.Interaction.pan = function(map, view, delta, opt_duration) {
+  var currentCenter = view.getCenter();
+  if (currentCenter) {
+    if (opt_duration && opt_duration > 0) {
+      map.beforeRender(ol.animation.pan({
+        source: currentCenter,
+        duration: opt_duration,
+        easing: ol.easing.linear
+      }));
+    }
+    var center = view.constrainCenter(
+        [currentCenter[0] + delta[0], currentCenter[1] + delta[1]]);
+    view.setCenter(center);
+  }
+};
+
+
+/**
+ * @param {ol.Map} map Map.
+ * @param {ol.View} view View.
+ * @param {number|undefined} rotation Rotation.
+ * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
+ * @param {number=} opt_duration Duration.
+ */
+ol.interaction.Interaction.rotate =
+    function(map, view, rotation, opt_anchor, opt_duration) {
+  rotation = view.constrainRotation(rotation, 0);
+  ol.interaction.Interaction.rotateWithoutConstraints(
+      map, view, rotation, opt_anchor, opt_duration);
+};
+
+
+/**
+ * @param {ol.Map} map Map.
+ * @param {ol.View} view View.
+ * @param {number|undefined} rotation Rotation.
+ * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
+ * @param {number=} opt_duration Duration.
+ */
+ol.interaction.Interaction.rotateWithoutConstraints =
+    function(map, view, rotation, opt_anchor, opt_duration) {
+  if (rotation !== undefined) {
+    var currentRotation = view.getRotation();
+    var currentCenter = view.getCenter();
+    if (currentRotation !== undefined && currentCenter &&
+        opt_duration && opt_duration > 0) {
+      map.beforeRender(ol.animation.rotate({
+        rotation: currentRotation,
+        duration: opt_duration,
+        easing: ol.easing.easeOut
+      }));
+      if (opt_anchor) {
+        map.beforeRender(ol.animation.pan({
+          source: currentCenter,
+          duration: opt_duration,
+          easing: ol.easing.easeOut
+        }));
+      }
+    }
+    view.rotate(rotation, opt_anchor);
+  }
+};
+
+
+/**
+ * @param {ol.Map} map Map.
+ * @param {ol.View} view View.
+ * @param {number|undefined} resolution Resolution to go to.
+ * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
+ * @param {number=} opt_duration Duration.
+ * @param {number=} opt_direction Zooming direction; > 0 indicates
+ *     zooming out, in which case the constraints system will select
+ *     the largest nearest resolution; < 0 indicates zooming in, in
+ *     which case the constraints system will select the smallest
+ *     nearest resolution; == 0 indicates that the zooming direction
+ *     is unknown/not relevant, in which case the constraints system
+ *     will select the nearest resolution. If not defined 0 is
+ *     assumed.
+ */
+ol.interaction.Interaction.zoom =
+    function(map, view, resolution, opt_anchor, opt_duration, opt_direction) {
+  resolution = view.constrainResolution(resolution, 0, opt_direction);
+  ol.interaction.Interaction.zoomWithoutConstraints(
+      map, view, resolution, opt_anchor, opt_duration);
+};
+
+
+/**
+ * @param {ol.Map} map Map.
+ * @param {ol.View} view View.
+ * @param {number} delta Delta from previous zoom level.
+ * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
+ * @param {number=} opt_duration Duration.
+ */
+ol.interaction.Interaction.zoomByDelta =
+    function(map, view, delta, opt_anchor, opt_duration) {
+  var currentResolution = view.getResolution();
+  var resolution = view.constrainResolution(currentResolution, delta, 0);
+  ol.interaction.Interaction.zoomWithoutConstraints(
+      map, view, resolution, opt_anchor, opt_duration);
+};
+
+
+/**
+ * @param {ol.Map} map Map.
+ * @param {ol.View} view View.
+ * @param {number|undefined} resolution Resolution to go to.
+ * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
+ * @param {number=} opt_duration Duration.
+ */
+ol.interaction.Interaction.zoomWithoutConstraints =
+    function(map, view, resolution, opt_anchor, opt_duration) {
+  if (resolution) {
+    var currentResolution = view.getResolution();
+    var currentCenter = view.getCenter();
+    if (currentResolution !== undefined && currentCenter &&
+        resolution !== currentResolution &&
+        opt_duration && opt_duration > 0) {
+      map.beforeRender(ol.animation.zoom({
+        resolution: currentResolution,
+        duration: opt_duration,
+        easing: ol.easing.easeOut
+      }));
+      if (opt_anchor) {
+        map.beforeRender(ol.animation.pan({
+          source: currentCenter,
+          duration: opt_duration,
+          easing: ol.easing.easeOut
+        }));
+      }
+    }
+    if (opt_anchor) {
+      var center = view.calculateCenterZoom(resolution, opt_anchor);
+      view.setCenter(center);
+    }
+    view.setResolution(resolution);
+  }
+};
+
+goog.provide('ol.interaction.DoubleClickZoom');
+
+goog.require('goog.asserts');
+goog.require('ol.MapBrowserEvent');
+goog.require('ol.MapBrowserEvent.EventType');
+goog.require('ol.interaction.Interaction');
+
+
+
+/**
+ * @classdesc
+ * Allows the user to zoom by double-clicking on the map.
+ *
+ * @constructor
+ * @extends {ol.interaction.Interaction}
+ * @param {olx.interaction.DoubleClickZoomOptions=} opt_options Options.
+ * @api stable
+ */
+ol.interaction.DoubleClickZoom = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.delta_ = options.delta ? options.delta : 1;
+
+  goog.base(this, {
+    handleEvent: ol.interaction.DoubleClickZoom.handleEvent
+  });
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.duration_ = options.duration !== undefined ? options.duration : 250;
+
+};
+goog.inherits(ol.interaction.DoubleClickZoom, ol.interaction.Interaction);
+
+
+/**
+ * Handles the {@link ol.MapBrowserEvent map browser event} (if it was a
+ * doubleclick) and eventually zooms the map.
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} `false` to stop event propagation.
+ * @this {ol.interaction.DoubleClickZoom}
+ * @api
+ */
+ol.interaction.DoubleClickZoom.handleEvent = function(mapBrowserEvent) {
+  var stopEvent = false;
+  var browserEvent = mapBrowserEvent.browserEvent;
+  if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.DBLCLICK) {
+    var map = mapBrowserEvent.map;
+    var anchor = mapBrowserEvent.coordinate;
+    var delta = browserEvent.shiftKey ? -this.delta_ : this.delta_;
+    var view = map.getView();
+    goog.asserts.assert(view, 'map must have a view');
+    ol.interaction.Interaction.zoomByDelta(
+        map, view, delta, anchor, this.duration_);
+    mapBrowserEvent.preventDefault();
+    stopEvent = true;
+  }
+  return !stopEvent;
+};
+
+goog.provide('ol.events.ConditionType');
+goog.provide('ol.events.condition');
+
+goog.require('goog.asserts');
+goog.require('goog.functions');
+goog.require('ol.MapBrowserEvent.EventType');
+goog.require('ol.MapBrowserPointerEvent');
+
+
+/**
+ * A function that takes an {@link ol.MapBrowserEvent} and returns a
+ * `{boolean}`. If the condition is met, true should be returned.
+ *
+ * @typedef {function(ol.MapBrowserEvent): boolean}
+ * @api stable
+ */
+ol.events.ConditionType;
+
+
+/**
+ * Return `true` if only the alt-key is pressed, `false` otherwise (e.g. when
+ * additionally the shift-key is pressed).
+ *
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} True if only the alt key is pressed.
+ * @api stable
+ */
+ol.events.condition.altKeyOnly = function(mapBrowserEvent) {
+  var browserEvent = mapBrowserEvent.browserEvent;
+  return (
+      browserEvent.altKey &&
+      !browserEvent.platformModifierKey &&
+      !browserEvent.shiftKey);
+};
+
+
+/**
+ * Return `true` if only the alt-key and shift-key is pressed, `false` otherwise
+ * (e.g. when additionally the platform-modifier-key is pressed).
+ *
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} True if only the alt and shift keys are pressed.
+ * @api stable
+ */
+ol.events.condition.altShiftKeysOnly = function(mapBrowserEvent) {
+  var browserEvent = mapBrowserEvent.browserEvent;
+  return (
+      browserEvent.altKey &&
+      !browserEvent.platformModifierKey &&
+      browserEvent.shiftKey);
+};
+
+
+/**
+ * Return always true.
+ *
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} True.
+ * @function
+ * @api stable
+ */
+ol.events.condition.always = goog.functions.TRUE;
+
+
+/**
+ * Return `true` if the event is a `click` event, `false` otherwise.
+ *
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} True if the event is a map `click` event.
+ * @api stable
+ */
+ol.events.condition.click = function(mapBrowserEvent) {
+  return mapBrowserEvent.type == ol.MapBrowserEvent.EventType.CLICK;
+};
+
+
+/**
+ * Return always false.
+ *
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} False.
+ * @function
+ * @api stable
+ */
+ol.events.condition.never = goog.functions.FALSE;
+
+
+/**
+ * Return `true` if the browser event is a `pointermove` event, `false`
+ * otherwise.
+ *
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} True if the browser event is a `pointermove` event.
+ * @api
+ */
+ol.events.condition.pointerMove = function(mapBrowserEvent) {
+  return mapBrowserEvent.type == 'pointermove';
+};
+
+
+/**
+ * Return `true` if the event is a map `singleclick` event, `false` otherwise.
+ *
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} True if the event is a map `singleclick` event.
+ * @api stable
+ */
+ol.events.condition.singleClick = function(mapBrowserEvent) {
+  return mapBrowserEvent.type == ol.MapBrowserEvent.EventType.SINGLECLICK;
+};
+
+
+/**
+ * Return `true` if the event is a map `dblclick` event, `false` otherwise.
+ *
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} True if the event is a map `dblclick` event.
+ * @api stable
+ */
+ol.events.condition.doubleClick = function(mapBrowserEvent) {
+  return mapBrowserEvent.type == ol.MapBrowserEvent.EventType.DBLCLICK;
+};
+
+
+/**
+ * Return `true` if no modifier key (alt-, shift- or platform-modifier-key) is
+ * pressed.
+ *
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} True only if there no modifier keys are pressed.
+ * @api stable
+ */
+ol.events.condition.noModifierKeys = function(mapBrowserEvent) {
+  var browserEvent = mapBrowserEvent.browserEvent;
+  return (
+      !browserEvent.altKey &&
+      !browserEvent.platformModifierKey &&
+      !browserEvent.shiftKey);
+};
+
+
+/**
+ * Return `true` if only the platform-modifier-key (the meta-key on Mac,
+ * ctrl-key otherwise) is pressed, `false` otherwise (e.g. when additionally
+ * the shift-key is pressed).
+ *
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} True if only the platform modifier key is pressed.
+ * @api stable
+ */
+ol.events.condition.platformModifierKeyOnly = function(mapBrowserEvent) {
+  var browserEvent = mapBrowserEvent.browserEvent;
+  return (
+      !browserEvent.altKey &&
+      browserEvent.platformModifierKey &&
+      !browserEvent.shiftKey);
+};
+
+
+/**
+ * Return `true` if only the shift-key is pressed, `false` otherwise (e.g. when
+ * additionally the alt-key is pressed).
+ *
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} True if only the shift key is pressed.
+ * @api stable
+ */
+ol.events.condition.shiftKeyOnly = function(mapBrowserEvent) {
+  var browserEvent = mapBrowserEvent.browserEvent;
+  return (
+      !browserEvent.altKey &&
+      !browserEvent.platformModifierKey &&
+      browserEvent.shiftKey);
+};
+
+
+/**
+ * Return `true` if the target element is not editable, i.e. not a `<input>`-,
+ * `<select>`- or `<textarea>`-element, `false` otherwise.
+ *
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} True only if the target element is not editable.
+ * @api
+ */
+ol.events.condition.targetNotEditable = function(mapBrowserEvent) {
+  var target = mapBrowserEvent.browserEvent.target;
+  goog.asserts.assertInstanceof(target, Element,
+      'target should be an Element');
+  var tagName = target.tagName;
+  return (
+      tagName !== 'INPUT' &&
+      tagName !== 'SELECT' &&
+      tagName !== 'TEXTAREA');
+};
+
+
+/**
+ * Return `true` if the event originates from a mouse device.
+ *
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} True if the event originates from a mouse device.
+ * @api stable
+ */
+ol.events.condition.mouseOnly = function(mapBrowserEvent) {
+  // see http://www.w3.org/TR/pointerevents/#widl-PointerEvent-pointerType
+  return mapBrowserEvent.pointerEvent.pointerType == 'mouse';
+};
+
+goog.provide('ol.interaction.Pointer');
+
+goog.require('goog.functions');
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.MapBrowserEvent.EventType');
+goog.require('ol.MapBrowserPointerEvent');
+goog.require('ol.Pixel');
+goog.require('ol.interaction.Interaction');
+
+
+
+/**
+ * @classdesc
+ * Base class that calls user-defined functions on `down`, `move` and `up`
+ * events. This class also manages "drag sequences".
+ *
+ * When the `handleDownEvent` user function returns `true` a drag sequence is
+ * started. During a drag sequence the `handleDragEvent` user function is
+ * called on `move` events. The drag sequence ends when the `handleUpEvent`
+ * user function is called and returns `false`.
+ *
+ * @constructor
+ * @param {olx.interaction.PointerOptions=} opt_options Options.
+ * @extends {ol.interaction.Interaction}
+ * @api
+ */
+ol.interaction.Pointer = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  var handleEvent = options.handleEvent ?
+      options.handleEvent : ol.interaction.Pointer.handleEvent;
+
+  goog.base(this, {
+    handleEvent: handleEvent
+  });
+
+  /**
+   * @type {function(ol.MapBrowserPointerEvent):boolean}
+   * @private
+   */
+  this.handleDownEvent_ = options.handleDownEvent ?
+      options.handleDownEvent : ol.interaction.Pointer.handleDownEvent;
+
+  /**
+   * @type {function(ol.MapBrowserPointerEvent)}
+   * @private
+   */
+  this.handleDragEvent_ = options.handleDragEvent ?
+      options.handleDragEvent : ol.interaction.Pointer.handleDragEvent;
+
+  /**
+   * @type {function(ol.MapBrowserPointerEvent)}
+   * @private
+   */
+  this.handleMoveEvent_ = options.handleMoveEvent ?
+      options.handleMoveEvent : ol.interaction.Pointer.handleMoveEvent;
+
+  /**
+   * @type {function(ol.MapBrowserPointerEvent):boolean}
+   * @private
+   */
+  this.handleUpEvent_ = options.handleUpEvent ?
+      options.handleUpEvent : ol.interaction.Pointer.handleUpEvent;
+
+  /**
+   * @type {boolean}
+   * @protected
+   */
+  this.handlingDownUpSequence = false;
+
+  /**
+   * @type {Object.<number, ol.pointer.PointerEvent>}
+   * @private
+   */
+  this.trackedPointers_ = {};
+
+  /**
+   * @type {Array.<ol.pointer.PointerEvent>}
+   * @protected
+   */
+  this.targetPointers = [];
+
+};
+goog.inherits(ol.interaction.Pointer, ol.interaction.Interaction);
+
+
+/**
+ * @param {Array.<ol.pointer.PointerEvent>} pointerEvents
+ * @return {ol.Pixel} Centroid pixel.
+ */
+ol.interaction.Pointer.centroid = function(pointerEvents) {
+  var length = pointerEvents.length;
+  var clientX = 0;
+  var clientY = 0;
+  for (var i = 0; i < length; i++) {
+    clientX += pointerEvents[i].clientX;
+    clientY += pointerEvents[i].clientY;
+  }
+  return [clientX / length, clientY / length];
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @return {boolean} Whether the event is a pointerdown, pointerdrag
+ *     or pointerup event.
+ * @private
+ */
+ol.interaction.Pointer.prototype.isPointerDraggingEvent_ =
+    function(mapBrowserEvent) {
+  var type = mapBrowserEvent.type;
+  return (
+      type === ol.MapBrowserEvent.EventType.POINTERDOWN ||
+      type === ol.MapBrowserEvent.EventType.POINTERDRAG ||
+      type === ol.MapBrowserEvent.EventType.POINTERUP);
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @private
+ */
+ol.interaction.Pointer.prototype.updateTrackedPointers_ =
+    function(mapBrowserEvent) {
+  if (this.isPointerDraggingEvent_(mapBrowserEvent)) {
+    var event = mapBrowserEvent.pointerEvent;
+
+    if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.POINTERUP) {
+      delete this.trackedPointers_[event.pointerId];
+    } else if (mapBrowserEvent.type ==
+        ol.MapBrowserEvent.EventType.POINTERDOWN) {
+      this.trackedPointers_[event.pointerId] = event;
+    } else if (event.pointerId in this.trackedPointers_) {
+      // update only when there was a pointerdown event for this pointer
+      this.trackedPointers_[event.pointerId] = event;
+    }
+    this.targetPointers = goog.object.getValues(this.trackedPointers_);
+  }
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @this {ol.interaction.Pointer}
+ */
+ol.interaction.Pointer.handleDragEvent = ol.nullFunction;
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @return {boolean} Capture dragging.
+ * @this {ol.interaction.Pointer}
+ */
+ol.interaction.Pointer.handleUpEvent = goog.functions.FALSE;
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @return {boolean} Capture dragging.
+ * @this {ol.interaction.Pointer}
+ */
+ol.interaction.Pointer.handleDownEvent = goog.functions.FALSE;
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @this {ol.interaction.Pointer}
+ */
+ol.interaction.Pointer.handleMoveEvent = ol.nullFunction;
+
+
+/**
+ * Handles the {@link ol.MapBrowserEvent map browser event} and may call into
+ * other functions, if event sequences like e.g. 'drag' or 'down-up' etc. are
+ * detected.
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} `false` to stop event propagation.
+ * @this {ol.interaction.Pointer}
+ * @api
+ */
+ol.interaction.Pointer.handleEvent = function(mapBrowserEvent) {
+  if (!(mapBrowserEvent instanceof ol.MapBrowserPointerEvent)) {
+    return true;
+  }
+
+  var stopEvent = false;
+  this.updateTrackedPointers_(mapBrowserEvent);
+  if (this.handlingDownUpSequence) {
+    if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.POINTERDRAG) {
+      this.handleDragEvent_(mapBrowserEvent);
+    } else if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.POINTERUP) {
+      this.handlingDownUpSequence = this.handleUpEvent_(mapBrowserEvent);
+    }
+  }
+  if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.POINTERDOWN) {
+    var handled = this.handleDownEvent_(mapBrowserEvent);
+    this.handlingDownUpSequence = handled;
+    stopEvent = this.shouldStopEvent(handled);
+  } else if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.POINTERMOVE) {
+    this.handleMoveEvent_(mapBrowserEvent);
+  }
+  return !stopEvent;
+};
+
+
+/**
+ * This method is used to determine if "down" events should be propagated to
+ * other interactions or should be stopped.
+ *
+ * The method receives the return code of the "handleDownEvent" function.
+ *
+ * By default this function is the "identity" function. It's overidden in
+ * child classes.
+ *
+ * @param {boolean} handled Was the event handled by the interaction?
+ * @return {boolean} Should the event be stopped?
+ * @protected
+ */
+ol.interaction.Pointer.prototype.shouldStopEvent = goog.functions.identity;
+
+goog.provide('ol.interaction.DragPan');
+
+goog.require('goog.asserts');
+goog.require('ol.Kinetic');
+goog.require('ol.Pixel');
+goog.require('ol.PreRenderFunction');
+goog.require('ol.ViewHint');
+goog.require('ol.coordinate');
+goog.require('ol.events.condition');
+goog.require('ol.interaction.Pointer');
+
+
+
+/**
+ * @classdesc
+ * Allows the user to pan the map by dragging the map.
+ *
+ * @constructor
+ * @extends {ol.interaction.Pointer}
+ * @param {olx.interaction.DragPanOptions=} opt_options Options.
+ * @api stable
+ */
+ol.interaction.DragPan = function(opt_options) {
+
+  goog.base(this, {
+    handleDownEvent: ol.interaction.DragPan.handleDownEvent_,
+    handleDragEvent: ol.interaction.DragPan.handleDragEvent_,
+    handleUpEvent: ol.interaction.DragPan.handleUpEvent_
+  });
+
+  var options = opt_options ? opt_options : {};
+
+  /**
+   * @private
+   * @type {ol.Kinetic|undefined}
+   */
+  this.kinetic_ = options.kinetic;
+
+  /**
+   * @private
+   * @type {?ol.PreRenderFunction}
+   */
+  this.kineticPreRenderFn_ = null;
+
+  /**
+   * @type {ol.Pixel}
+   */
+  this.lastCentroid = null;
+
+  /**
+   * @private
+   * @type {ol.events.ConditionType}
+   */
+  this.condition_ = options.condition ?
+      options.condition : ol.events.condition.noModifierKeys;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.noKinetic_ = false;
+
+};
+goog.inherits(ol.interaction.DragPan, ol.interaction.Pointer);
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @this {ol.interaction.DragPan}
+ * @private
+ */
+ol.interaction.DragPan.handleDragEvent_ = function(mapBrowserEvent) {
+  goog.asserts.assert(this.targetPointers.length >= 1,
+      'the length of this.targetPointers should be more than 1');
+  var centroid =
+      ol.interaction.Pointer.centroid(this.targetPointers);
+  if (this.kinetic_) {
+    this.kinetic_.update(centroid[0], centroid[1]);
+  }
+  if (this.lastCentroid) {
+    var deltaX = this.lastCentroid[0] - centroid[0];
+    var deltaY = centroid[1] - this.lastCentroid[1];
+    var map = mapBrowserEvent.map;
+    var view = map.getView();
+    var viewState = view.getState();
+    var center = [deltaX, deltaY];
+    ol.coordinate.scale(center, viewState.resolution);
+    ol.coordinate.rotate(center, viewState.rotation);
+    ol.coordinate.add(center, viewState.center);
+    center = view.constrainCenter(center);
+    map.render();
+    view.setCenter(center);
+  }
+  this.lastCentroid = centroid;
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @return {boolean} Stop drag sequence?
+ * @this {ol.interaction.DragPan}
+ * @private
+ */
+ol.interaction.DragPan.handleUpEvent_ = function(mapBrowserEvent) {
+  var map = mapBrowserEvent.map;
+  var view = map.getView();
+  if (this.targetPointers.length === 0) {
+    if (!this.noKinetic_ && this.kinetic_ && this.kinetic_.end()) {
+      var distance = this.kinetic_.getDistance();
+      var angle = this.kinetic_.getAngle();
+      var center = view.getCenter();
+      goog.asserts.assert(center !== undefined, 'center should be defined');
+      this.kineticPreRenderFn_ = this.kinetic_.pan(center);
+      map.beforeRender(this.kineticPreRenderFn_);
+      var centerpx = map.getPixelFromCoordinate(center);
+      var dest = map.getCoordinateFromPixel([
+        centerpx[0] - distance * Math.cos(angle),
+        centerpx[1] - distance * Math.sin(angle)
+      ]);
+      dest = view.constrainCenter(dest);
+      view.setCenter(dest);
+    }
+    view.setHint(ol.ViewHint.INTERACTING, -1);
+    map.render();
+    return false;
+  } else {
+    this.lastCentroid = null;
+    return true;
+  }
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @return {boolean} Start drag sequence?
+ * @this {ol.interaction.DragPan}
+ * @private
+ */
+ol.interaction.DragPan.handleDownEvent_ = function(mapBrowserEvent) {
+  if (this.targetPointers.length > 0 && this.condition_(mapBrowserEvent)) {
+    var map = mapBrowserEvent.map;
+    var view = map.getView();
+    this.lastCentroid = null;
+    if (!this.handlingDownUpSequence) {
+      view.setHint(ol.ViewHint.INTERACTING, 1);
+    }
+    map.render();
+    if (this.kineticPreRenderFn_ &&
+        map.removePreRenderFunction(this.kineticPreRenderFn_)) {
+      view.setCenter(mapBrowserEvent.frameState.viewState.center);
+      this.kineticPreRenderFn_ = null;
+    }
+    if (this.kinetic_) {
+      this.kinetic_.begin();
+    }
+    // No kinetic as soon as more than one pointer on the screen is
+    // detected. This is to prevent nasty pans after pinch.
+    this.noKinetic_ = this.targetPointers.length > 1;
+    return true;
+  } else {
+    return false;
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.interaction.DragPan.prototype.shouldStopEvent = goog.functions.FALSE;
+
+goog.provide('ol.interaction.DragRotate');
+
+goog.require('ol');
+goog.require('ol.ViewHint');
+goog.require('ol.events.ConditionType');
+goog.require('ol.events.condition');
+goog.require('ol.interaction.Interaction');
+goog.require('ol.interaction.Pointer');
+
+
+
+/**
+ * @classdesc
+ * Allows the user to rotate the map by clicking and dragging on the map,
+ * normally combined with an {@link ol.events.condition} that limits
+ * it to when the alt and shift keys are held down.
+ *
+ * This interaction is only supported for mouse devices.
+ *
+ * @constructor
+ * @extends {ol.interaction.Pointer}
+ * @param {olx.interaction.DragRotateOptions=} opt_options Options.
+ * @api stable
+ */
+ol.interaction.DragRotate = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  goog.base(this, {
+    handleDownEvent: ol.interaction.DragRotate.handleDownEvent_,
+    handleDragEvent: ol.interaction.DragRotate.handleDragEvent_,
+    handleUpEvent: ol.interaction.DragRotate.handleUpEvent_
+  });
+
+  /**
+   * @private
+   * @type {ol.events.ConditionType}
+   */
+  this.condition_ = options.condition ?
+      options.condition : ol.events.condition.altShiftKeysOnly;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.lastAngle_ = undefined;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.duration_ = options.duration !== undefined ? options.duration : 250;
+};
+goog.inherits(ol.interaction.DragRotate, ol.interaction.Pointer);
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @this {ol.interaction.DragRotate}
+ * @private
+ */
+ol.interaction.DragRotate.handleDragEvent_ = function(mapBrowserEvent) {
+  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
+    return;
+  }
+
+  var map = mapBrowserEvent.map;
+  var size = map.getSize();
+  var offset = mapBrowserEvent.pixel;
+  var theta =
+      Math.atan2(size[1] / 2 - offset[1], offset[0] - size[0] / 2);
+  if (this.lastAngle_ !== undefined) {
+    var delta = theta - this.lastAngle_;
+    var view = map.getView();
+    var rotation = view.getRotation();
+    map.render();
+    ol.interaction.Interaction.rotateWithoutConstraints(
+        map, view, rotation - delta);
+  }
+  this.lastAngle_ = theta;
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @return {boolean} Stop drag sequence?
+ * @this {ol.interaction.DragRotate}
+ * @private
+ */
+ol.interaction.DragRotate.handleUpEvent_ = function(mapBrowserEvent) {
+  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
+    return true;
+  }
+
+  var map = mapBrowserEvent.map;
+  var view = map.getView();
+  view.setHint(ol.ViewHint.INTERACTING, -1);
+  var rotation = view.getRotation();
+  ol.interaction.Interaction.rotate(map, view, rotation,
+      undefined, this.duration_);
+  return false;
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @return {boolean} Start drag sequence?
+ * @this {ol.interaction.DragRotate}
+ * @private
+ */
+ol.interaction.DragRotate.handleDownEvent_ = function(mapBrowserEvent) {
+  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
+    return false;
+  }
+
+  var browserEvent = mapBrowserEvent.browserEvent;
+  if (browserEvent.isMouseActionButton() && this.condition_(mapBrowserEvent)) {
+    var map = mapBrowserEvent.map;
+    map.getView().setHint(ol.ViewHint.INTERACTING, 1);
+    map.render();
+    this.lastAngle_ = undefined;
+    return true;
+  } else {
+    return false;
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.interaction.DragRotate.prototype.shouldStopEvent = goog.functions.FALSE;
+
+// FIXME add rotation
+
+goog.provide('ol.render.Box');
+
+goog.require('goog.Disposable');
+goog.require('goog.asserts');
+goog.require('ol.geom.Polygon');
+
+
+
+/**
+ * @constructor
+ * @extends {goog.Disposable}
+ * @param {string} className CSS class name.
+ */
+ol.render.Box = function(className) {
+
+  /**
+   * @type {ol.geom.Polygon}
+   * @private
+   */
+  this.geometry_ = null;
+
+  /**
+   * @type {HTMLDivElement}
+   * @private
+   */
+  this.element_ = /** @type {HTMLDivElement} */ (document.createElement('div'));
+  this.element_.style.position = 'absolute';
+  this.element_.className = 'ol-box ' + className;
+
+  /**
+   * @private
+   * @type {ol.Map}
+   */
+  this.map_ = null;
+
+  /**
+   * @private
+   * @type {ol.Pixel}
+   */
+  this.startPixel_ = null;
+
+  /**
+   * @private
+   * @type {ol.Pixel}
+   */
+  this.endPixel_ = null;
+
+};
+goog.inherits(ol.render.Box, goog.Disposable);
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.Box.prototype.disposeInternal = function() {
+  this.setMap(null);
+  goog.base(this, 'disposeInternal');
+};
+
+
+/**
+ * @private
+ */
+ol.render.Box.prototype.render_ = function() {
+  var startPixel = this.startPixel_;
+  var endPixel = this.endPixel_;
+  goog.asserts.assert(startPixel, 'this.startPixel_ must be truthy');
+  goog.asserts.assert(endPixel, 'this.endPixel_ must be truthy');
+  var px = 'px';
+  var style = this.element_.style;
+  style.left = Math.min(startPixel[0], endPixel[0]) + px;
+  style.top = Math.min(startPixel[1], endPixel[1]) + px;
+  style.width = Math.abs(endPixel[0] - startPixel[0]) + px;
+  style.height = Math.abs(endPixel[1] - startPixel[1]) + px;
+};
+
+
+/**
+ * @param {ol.Map} map Map.
+ */
+ol.render.Box.prototype.setMap = function(map) {
+  if (this.map_) {
+    this.map_.getOverlayContainer().removeChild(this.element_);
+    var style = this.element_.style;
+    style.left = style.top = style.width = style.height = 'inherit';
+  }
+  this.map_ = map;
+  if (this.map_) {
+    this.map_.getOverlayContainer().appendChild(this.element_);
+  }
+};
+
+
+/**
+ * @param {ol.Pixel} startPixel Start pixel.
+ * @param {ol.Pixel} endPixel End pixel.
+ */
+ol.render.Box.prototype.setPixels = function(startPixel, endPixel) {
+  this.startPixel_ = startPixel;
+  this.endPixel_ = endPixel;
+  this.createOrUpdateGeometry();
+  this.render_();
+};
+
+
+/**
+ * Creates or updates the cached geometry.
+ */
+ol.render.Box.prototype.createOrUpdateGeometry = function() {
+  goog.asserts.assert(this.startPixel_,
+      'this.startPixel_ must be truthy');
+  goog.asserts.assert(this.endPixel_,
+      'this.endPixel_ must be truthy');
+  goog.asserts.assert(this.map_, 'this.map_ must be truthy');
+  var startPixel = this.startPixel_;
+  var endPixel = this.endPixel_;
+  var pixels = [
+    startPixel,
+    [startPixel[0], endPixel[1]],
+    endPixel,
+    [endPixel[0], startPixel[1]]
+  ];
+  var coordinates = pixels.map(this.map_.getCoordinateFromPixel, this.map_);
+  // close the polygon
+  coordinates[4] = coordinates[0].slice();
+  if (!this.geometry_) {
+    this.geometry_ = new ol.geom.Polygon([coordinates]);
+  } else {
+    this.geometry_.setCoordinates([coordinates]);
+  }
+};
+
+
+/**
+ * @return {ol.geom.Polygon} Geometry.
+ */
+ol.render.Box.prototype.getGeometry = function() {
+  return this.geometry_;
+};
+
+// FIXME draw drag box
+goog.provide('ol.DragBoxEvent');
+goog.provide('ol.interaction.DragBox');
+
+goog.require('goog.events.Event');
+goog.require('ol');
+goog.require('ol.events.ConditionType');
+goog.require('ol.events.condition');
+goog.require('ol.interaction.Pointer');
+goog.require('ol.render.Box');
+
+
+/**
+ * @const
+ * @type {number}
+ */
+ol.DRAG_BOX_HYSTERESIS_PIXELS_SQUARED =
+    ol.DRAG_BOX_HYSTERESIS_PIXELS *
+    ol.DRAG_BOX_HYSTERESIS_PIXELS;
+
+
+/**
+ * @enum {string}
+ */
+ol.DragBoxEventType = {
+  /**
+   * Triggered upon drag box start.
+   * @event ol.DragBoxEvent#boxstart
+   * @api stable
+   */
+  BOXSTART: 'boxstart',
+  /**
+   * Triggered upon drag box end.
+   * @event ol.DragBoxEvent#boxend
+   * @api stable
+   */
+  BOXEND: 'boxend'
+};
+
+
+
+/**
+ * @classdesc
+ * Events emitted by {@link ol.interaction.DragBox} instances are instances of
+ * this type.
+ *
+ * @param {string} type The event type.
+ * @param {ol.Coordinate} coordinate The event coordinate.
+ * @extends {goog.events.Event}
+ * @constructor
+ * @implements {oli.DragBoxEvent}
+ */
+ol.DragBoxEvent = function(type, coordinate) {
+  goog.base(this, type);
+
+  /**
+   * The coordinate of the drag event.
+   * @const
+   * @type {ol.Coordinate}
+   * @api stable
+   */
+  this.coordinate = coordinate;
+
+};
+goog.inherits(ol.DragBoxEvent, goog.events.Event);
+
+
+
+/**
+ * @classdesc
+ * Allows the user to draw a vector box by clicking and dragging on the map,
+ * normally combined with an {@link ol.events.condition} that limits
+ * it to when the shift or other key is held down. This is used, for example,
+ * for zooming to a specific area of the map
+ * (see {@link ol.interaction.DragZoom} and
+ * {@link ol.interaction.DragRotateAndZoom}).
+ *
+ * This interaction is only supported for mouse devices.
+ *
+ * @constructor
+ * @extends {ol.interaction.Pointer}
+ * @fires ol.DragBoxEvent
+ * @param {olx.interaction.DragBoxOptions=} opt_options Options.
+ * @api stable
+ */
+ol.interaction.DragBox = function(opt_options) {
+
+  goog.base(this, {
+    handleDownEvent: ol.interaction.DragBox.handleDownEvent_,
+    handleDragEvent: ol.interaction.DragBox.handleDragEvent_,
+    handleUpEvent: ol.interaction.DragBox.handleUpEvent_
+  });
+
+  var options = opt_options ? opt_options : {};
+
+  /**
+   * @type {ol.render.Box}
+   * @private
+   */
+  this.box_ = new ol.render.Box(options.className || 'ol-dragbox');
+
+  /**
+   * @type {ol.Pixel}
+   * @private
+   */
+  this.startPixel_ = null;
+
+  /**
+   * @private
+   * @type {ol.events.ConditionType}
+   */
+  this.condition_ = options.condition ?
+      options.condition : ol.events.condition.always;
+
+};
+goog.inherits(ol.interaction.DragBox, ol.interaction.Pointer);
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @this {ol.interaction.DragBox}
+ * @private
+ */
+ol.interaction.DragBox.handleDragEvent_ = function(mapBrowserEvent) {
+  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
+    return;
+  }
+
+  this.box_.setPixels(this.startPixel_, mapBrowserEvent.pixel);
+};
+
+
+/**
+ * Returns geometry of last drawn box.
+ * @return {ol.geom.Polygon} Geometry.
+ * @api stable
+ */
+ol.interaction.DragBox.prototype.getGeometry = function() {
+  return this.box_.getGeometry();
+};
+
+
+/**
+ * To be overriden by child classes.
+ * FIXME: use constructor option instead of relying on overridding.
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @protected
+ */
+ol.interaction.DragBox.prototype.onBoxEnd = ol.nullFunction;
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @return {boolean} Stop drag sequence?
+ * @this {ol.interaction.DragBox}
+ * @private
+ */
+ol.interaction.DragBox.handleUpEvent_ = function(mapBrowserEvent) {
+  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
+    return true;
+  }
+
+  this.box_.setMap(null);
+
+  var deltaX = mapBrowserEvent.pixel[0] - this.startPixel_[0];
+  var deltaY = mapBrowserEvent.pixel[1] - this.startPixel_[1];
+
+  if (deltaX * deltaX + deltaY * deltaY >=
+      ol.DRAG_BOX_HYSTERESIS_PIXELS_SQUARED) {
+    this.onBoxEnd(mapBrowserEvent);
+    this.dispatchEvent(new ol.DragBoxEvent(ol.DragBoxEventType.BOXEND,
+        mapBrowserEvent.coordinate));
+  }
+  return false;
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @return {boolean} Start drag sequence?
+ * @this {ol.interaction.DragBox}
+ * @private
+ */
+ol.interaction.DragBox.handleDownEvent_ = function(mapBrowserEvent) {
+  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
+    return false;
+  }
+
+  var browserEvent = mapBrowserEvent.browserEvent;
+  if (browserEvent.isMouseActionButton() && this.condition_(mapBrowserEvent)) {
+    this.startPixel_ = mapBrowserEvent.pixel;
+    this.box_.setMap(mapBrowserEvent.map);
+    this.box_.setPixels(this.startPixel_, this.startPixel_);
+    this.dispatchEvent(new ol.DragBoxEvent(ol.DragBoxEventType.BOXSTART,
+        mapBrowserEvent.coordinate));
+    return true;
+  } else {
+    return false;
+  }
+};
+
+goog.provide('ol.interaction.DragZoom');
+
+goog.require('goog.asserts');
+goog.require('ol.animation');
+goog.require('ol.easing');
+goog.require('ol.events.condition');
+goog.require('ol.extent');
+goog.require('ol.interaction.DragBox');
+
+
+
+/**
+ * @classdesc
+ * Allows the user to zoom the map by clicking and dragging on the map,
+ * normally combined with an {@link ol.events.condition} that limits
+ * it to when a key, shift by default, is held down.
+ *
+ * To change the style of the box, use CSS and the `.ol-dragzoom` selector, or
+ * your custom one configured with `className`.
+ *
+ * @constructor
+ * @extends {ol.interaction.DragBox}
+ * @param {olx.interaction.DragZoomOptions=} opt_options Options.
+ * @api stable
+ */
+ol.interaction.DragZoom = function(opt_options) {
+  var options = opt_options ? opt_options : {};
+
+  var condition = options.condition ?
+      options.condition : ol.events.condition.shiftKeyOnly;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.duration_ = options.duration !== undefined ? options.duration : 200;
+
+  goog.base(this, {
+    condition: condition,
+    className: options.className || 'ol-dragzoom'
+  });
+
+};
+goog.inherits(ol.interaction.DragZoom, ol.interaction.DragBox);
+
+
+/**
+ * @inheritDoc
+ */
+ol.interaction.DragZoom.prototype.onBoxEnd = function() {
+  var map = this.getMap();
+
+  var view = map.getView();
+  goog.asserts.assert(view, 'map must have view');
+
+  var size = map.getSize();
+  goog.asserts.assert(size !== undefined, 'size should be defined');
+
+  var extent = this.getGeometry().getExtent();
+
+  var resolution = view.constrainResolution(
+      view.getResolutionForExtent(extent, size));
+
+  var currentResolution = view.getResolution();
+  goog.asserts.assert(currentResolution !== undefined, 'res should be defined');
+
+  var currentCenter = view.getCenter();
+  goog.asserts.assert(currentCenter !== undefined, 'center should be defined');
+
+  map.beforeRender(ol.animation.zoom({
+    resolution: currentResolution,
+    duration: this.duration_,
+    easing: ol.easing.easeOut
+  }));
+  map.beforeRender(ol.animation.pan({
+    source: currentCenter,
+    duration: this.duration_,
+    easing: ol.easing.easeOut
+  }));
+
+  view.setCenter(ol.extent.getCenter(extent));
+  view.setResolution(resolution);
+};
+
+goog.provide('ol.interaction.KeyboardPan');
+
+goog.require('goog.asserts');
+goog.require('goog.events.KeyCodes');
+goog.require('goog.events.KeyHandler.EventType');
+goog.require('goog.functions');
+goog.require('ol');
+goog.require('ol.coordinate');
+goog.require('ol.events.ConditionType');
+goog.require('ol.events.condition');
+goog.require('ol.interaction.Interaction');
+
+
+
+/**
+ * @classdesc
+ * Allows the user to pan the map using keyboard arrows.
+ * Note that, although this interaction is by default included in maps,
+ * the keys can only be used when browser focus is on the element to which
+ * the keyboard events are attached. By default, this is the map div,
+ * though you can change this with the `keyboardEventTarget` in
+ * {@link ol.Map}. `document` never loses focus but, for any other element,
+ * focus will have to be on, and returned to, this element if the keys are to
+ * function.
+ * See also {@link ol.interaction.KeyboardZoom}.
+ *
+ * @constructor
+ * @extends {ol.interaction.Interaction}
+ * @param {olx.interaction.KeyboardPanOptions=} opt_options Options.
+ * @api stable
+ */
+ol.interaction.KeyboardPan = function(opt_options) {
+
+  goog.base(this, {
+    handleEvent: ol.interaction.KeyboardPan.handleEvent
+  });
+
+  var options = opt_options || {};
+
+  /**
+   * @private
+   * @type {ol.events.ConditionType}
+   */
+  this.condition_ = options.condition !== undefined ?
+      options.condition :
+      goog.functions.and(ol.events.condition.noModifierKeys,
+          ol.events.condition.targetNotEditable);
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.duration_ = options.duration !== undefined ? options.duration : 100;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.pixelDelta_ = options.pixelDelta !== undefined ?
+      options.pixelDelta : 128;
+
+};
+goog.inherits(ol.interaction.KeyboardPan, ol.interaction.Interaction);
+
+
+/**
+ * Handles the {@link ol.MapBrowserEvent map browser event} if it was a
+ * `KeyEvent`, and decides the direction to pan to (if an arrow key was
+ * pressed).
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} `false` to stop event propagation.
+ * @this {ol.interaction.KeyboardPan}
+ * @api
+ */
+ol.interaction.KeyboardPan.handleEvent = function(mapBrowserEvent) {
+  var stopEvent = false;
+  if (mapBrowserEvent.type == goog.events.KeyHandler.EventType.KEY) {
+    var keyEvent = /** @type {goog.events.KeyEvent} */
+        (mapBrowserEvent.browserEvent);
+    var keyCode = keyEvent.keyCode;
+    if (this.condition_(mapBrowserEvent) &&
+        (keyCode == goog.events.KeyCodes.DOWN ||
+        keyCode == goog.events.KeyCodes.LEFT ||
+        keyCode == goog.events.KeyCodes.RIGHT ||
+        keyCode == goog.events.KeyCodes.UP)) {
+      var map = mapBrowserEvent.map;
+      var view = map.getView();
+      goog.asserts.assert(view, 'map must have view');
+      var mapUnitsDelta = view.getResolution() * this.pixelDelta_;
+      var deltaX = 0, deltaY = 0;
+      if (keyCode == goog.events.KeyCodes.DOWN) {
+        deltaY = -mapUnitsDelta;
+      } else if (keyCode == goog.events.KeyCodes.LEFT) {
+        deltaX = -mapUnitsDelta;
+      } else if (keyCode == goog.events.KeyCodes.RIGHT) {
+        deltaX = mapUnitsDelta;
+      } else {
+        deltaY = mapUnitsDelta;
+      }
+      var delta = [deltaX, deltaY];
+      ol.coordinate.rotate(delta, view.getRotation());
+      ol.interaction.Interaction.pan(map, view, delta, this.duration_);
+      mapBrowserEvent.preventDefault();
+      stopEvent = true;
+    }
+  }
+  return !stopEvent;
+};
+
+goog.provide('ol.interaction.KeyboardZoom');
+
+goog.require('goog.asserts');
+goog.require('goog.events.KeyHandler.EventType');
+goog.require('ol.events.ConditionType');
+goog.require('ol.events.condition');
+goog.require('ol.interaction.Interaction');
+
+
+
+/**
+ * @classdesc
+ * Allows the user to zoom the map using keyboard + and -.
+ * Note that, although this interaction is by default included in maps,
+ * the keys can only be used when browser focus is on the element to which
+ * the keyboard events are attached. By default, this is the map div,
+ * though you can change this with the `keyboardEventTarget` in
+ * {@link ol.Map}. `document` never loses focus but, for any other element,
+ * focus will have to be on, and returned to, this element if the keys are to
+ * function.
+ * See also {@link ol.interaction.KeyboardPan}.
+ *
+ * @constructor
+ * @param {olx.interaction.KeyboardZoomOptions=} opt_options Options.
+ * @extends {ol.interaction.Interaction}
+ * @api stable
+ */
+ol.interaction.KeyboardZoom = function(opt_options) {
+
+  goog.base(this, {
+    handleEvent: ol.interaction.KeyboardZoom.handleEvent
+  });
+
+  var options = opt_options ? opt_options : {};
+
+  /**
+   * @private
+   * @type {ol.events.ConditionType}
+   */
+  this.condition_ = options.condition ? options.condition :
+          ol.events.condition.targetNotEditable;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.delta_ = options.delta ? options.delta : 1;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.duration_ = options.duration !== undefined ? options.duration : 100;
+
+};
+goog.inherits(ol.interaction.KeyboardZoom, ol.interaction.Interaction);
+
+
+/**
+ * Handles the {@link ol.MapBrowserEvent map browser event} if it was a
+ * `KeyEvent`, and decides whether to zoom in or out (depending on whether the
+ * key pressed was '+' or '-').
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} `false` to stop event propagation.
+ * @this {ol.interaction.KeyboardZoom}
+ * @api
+ */
+ol.interaction.KeyboardZoom.handleEvent = function(mapBrowserEvent) {
+  var stopEvent = false;
+  if (mapBrowserEvent.type == goog.events.KeyHandler.EventType.KEY) {
+    var keyEvent = /** @type {goog.events.KeyEvent} */
+        (mapBrowserEvent.browserEvent);
+    var charCode = keyEvent.charCode;
+    if (this.condition_(mapBrowserEvent) &&
+        (charCode == '+'.charCodeAt(0) || charCode == '-'.charCodeAt(0))) {
+      var map = mapBrowserEvent.map;
+      var delta = (charCode == '+'.charCodeAt(0)) ? this.delta_ : -this.delta_;
+      map.render();
+      var view = map.getView();
+      goog.asserts.assert(view, 'map must have view');
+      ol.interaction.Interaction.zoomByDelta(
+          map, view, delta, undefined, this.duration_);
+      mapBrowserEvent.preventDefault();
+      stopEvent = true;
+    }
+  }
+  return !stopEvent;
+};
+
+goog.provide('ol.interaction.MouseWheelZoom');
+
+goog.require('goog.asserts');
+goog.require('goog.events.MouseWheelEvent');
+goog.require('goog.events.MouseWheelHandler.EventType');
+goog.require('ol');
+goog.require('ol.Coordinate');
+goog.require('ol.interaction.Interaction');
+goog.require('ol.math');
+
+
+
+/**
+ * @classdesc
+ * Allows the user to zoom the map by scrolling the mouse wheel.
+ *
+ * @constructor
+ * @extends {ol.interaction.Interaction}
+ * @param {olx.interaction.MouseWheelZoomOptions=} opt_options Options.
+ * @api stable
+ */
+ol.interaction.MouseWheelZoom = function(opt_options) {
+
+  goog.base(this, {
+    handleEvent: ol.interaction.MouseWheelZoom.handleEvent
+  });
+
+  var options = opt_options || {};
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.delta_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.duration_ = options.duration !== undefined ? options.duration : 250;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.useAnchor_ = options.useAnchor !== undefined ? options.useAnchor : true;
+
+  /**
+   * @private
+   * @type {?ol.Coordinate}
+   */
+  this.lastAnchor_ = null;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.startTime_ = undefined;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.timeoutId_ = undefined;
+
+};
+goog.inherits(ol.interaction.MouseWheelZoom, ol.interaction.Interaction);
+
+
+/**
+ * Handles the {@link ol.MapBrowserEvent map browser event} (if it was a
+ * mousewheel-event) and eventually zooms the map.
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} `false` to stop event propagation.
+ * @this {ol.interaction.MouseWheelZoom}
+ * @api
+ */
+ol.interaction.MouseWheelZoom.handleEvent = function(mapBrowserEvent) {
+  var stopEvent = false;
+  if (mapBrowserEvent.type ==
+      goog.events.MouseWheelHandler.EventType.MOUSEWHEEL) {
+    var map = mapBrowserEvent.map;
+    var mouseWheelEvent = mapBrowserEvent.browserEvent;
+    goog.asserts.assertInstanceof(mouseWheelEvent, goog.events.MouseWheelEvent,
+        'mouseWheelEvent should be of type MouseWheelEvent');
+
+    if (this.useAnchor_) {
+      this.lastAnchor_ = mapBrowserEvent.coordinate;
+    }
+
+    this.delta_ += mouseWheelEvent.deltaY;
+
+    if (this.startTime_ === undefined) {
+      this.startTime_ = Date.now();
+    }
+
+    var duration = ol.MOUSEWHEELZOOM_TIMEOUT_DURATION;
+    var timeLeft = Math.max(duration - (Date.now() - this.startTime_), 0);
+
+    goog.global.clearTimeout(this.timeoutId_);
+    this.timeoutId_ = goog.global.setTimeout(
+        goog.bind(this.doZoom_, this, map), timeLeft);
+
+    mapBrowserEvent.preventDefault();
+    stopEvent = true;
+  }
+  return !stopEvent;
+};
+
+
+/**
+ * @private
+ * @param {ol.Map} map Map.
+ */
+ol.interaction.MouseWheelZoom.prototype.doZoom_ = function(map) {
+  var maxDelta = ol.MOUSEWHEELZOOM_MAXDELTA;
+  var delta = ol.math.clamp(this.delta_, -maxDelta, maxDelta);
+
+  var view = map.getView();
+  goog.asserts.assert(view, 'map must have view');
+
+  map.render();
+  ol.interaction.Interaction.zoomByDelta(map, view, -delta, this.lastAnchor_,
+      this.duration_);
+
+  this.delta_ = 0;
+  this.lastAnchor_ = null;
+  this.startTime_ = undefined;
+  this.timeoutId_ = undefined;
+};
+
+
+/**
+ * Enable or disable using the mouse's location as an anchor when zooming
+ * @param {boolean} useAnchor true to zoom to the mouse's location, false
+ * to zoom to the center of the map
+ * @api
+ */
+ol.interaction.MouseWheelZoom.prototype.setMouseAnchor = function(useAnchor) {
+  this.useAnchor_ = useAnchor;
+  if (!useAnchor) {
+    this.lastAnchor_ = null;
+  }
+};
+
+goog.provide('ol.interaction.PinchRotate');
+
+goog.require('goog.asserts');
+goog.require('goog.functions');
+goog.require('goog.style');
+goog.require('ol');
+goog.require('ol.Coordinate');
+goog.require('ol.ViewHint');
+goog.require('ol.interaction.Interaction');
+goog.require('ol.interaction.Pointer');
+
+
+
+/**
+ * @classdesc
+ * Allows the user to rotate the map by twisting with two fingers
+ * on a touch screen.
+ *
+ * @constructor
+ * @extends {ol.interaction.Pointer}
+ * @param {olx.interaction.PinchRotateOptions=} opt_options Options.
+ * @api stable
+ */
+ol.interaction.PinchRotate = function(opt_options) {
+
+  goog.base(this, {
+    handleDownEvent: ol.interaction.PinchRotate.handleDownEvent_,
+    handleDragEvent: ol.interaction.PinchRotate.handleDragEvent_,
+    handleUpEvent: ol.interaction.PinchRotate.handleUpEvent_
+  });
+
+  var options = opt_options || {};
+
+  /**
+   * @private
+   * @type {ol.Coordinate}
+   */
+  this.anchor_ = null;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.lastAngle_ = undefined;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.rotating_ = false;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.rotationDelta_ = 0.0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.threshold_ = options.threshold !== undefined ? options.threshold : 0.3;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.duration_ = options.duration !== undefined ? options.duration : 250;
+
+};
+goog.inherits(ol.interaction.PinchRotate, ol.interaction.Pointer);
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @this {ol.interaction.PinchRotate}
+ * @private
+ */
+ol.interaction.PinchRotate.handleDragEvent_ = function(mapBrowserEvent) {
+  goog.asserts.assert(this.targetPointers.length >= 2,
+      'length of this.targetPointers should be greater than or equal to 2');
+  var rotationDelta = 0.0;
+
+  var touch0 = this.targetPointers[0];
+  var touch1 = this.targetPointers[1];
+
+  // angle between touches
+  var angle = Math.atan2(
+      touch1.clientY - touch0.clientY,
+      touch1.clientX - touch0.clientX);
+
+  if (this.lastAngle_ !== undefined) {
+    var delta = angle - this.lastAngle_;
+    this.rotationDelta_ += delta;
+    if (!this.rotating_ &&
+        Math.abs(this.rotationDelta_) > this.threshold_) {
+      this.rotating_ = true;
+    }
+    rotationDelta = delta;
+  }
+  this.lastAngle_ = angle;
+
+  var map = mapBrowserEvent.map;
+
+  // rotate anchor point.
+  // FIXME: should be the intersection point between the lines:
+  //     touch0,touch1 and previousTouch0,previousTouch1
+  var viewportPosition = goog.style.getClientPosition(map.getViewport());
+  var centroid =
+      ol.interaction.Pointer.centroid(this.targetPointers);
+  centroid[0] -= viewportPosition.x;
+  centroid[1] -= viewportPosition.y;
+  this.anchor_ = map.getCoordinateFromPixel(centroid);
+
+  // rotate
+  if (this.rotating_) {
+    var view = map.getView();
+    var rotation = view.getRotation();
+    map.render();
+    ol.interaction.Interaction.rotateWithoutConstraints(map, view,
+        rotation + rotationDelta, this.anchor_);
+  }
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @return {boolean} Stop drag sequence?
+ * @this {ol.interaction.PinchRotate}
+ * @private
+ */
+ol.interaction.PinchRotate.handleUpEvent_ = function(mapBrowserEvent) {
+  if (this.targetPointers.length < 2) {
+    var map = mapBrowserEvent.map;
+    var view = map.getView();
+    view.setHint(ol.ViewHint.INTERACTING, -1);
+    if (this.rotating_) {
+      var rotation = view.getRotation();
+      ol.interaction.Interaction.rotate(
+          map, view, rotation, this.anchor_, this.duration_);
+    }
+    return false;
+  } else {
+    return true;
+  }
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @return {boolean} Start drag sequence?
+ * @this {ol.interaction.PinchRotate}
+ * @private
+ */
+ol.interaction.PinchRotate.handleDownEvent_ = function(mapBrowserEvent) {
+  if (this.targetPointers.length >= 2) {
+    var map = mapBrowserEvent.map;
+    this.anchor_ = null;
+    this.lastAngle_ = undefined;
+    this.rotating_ = false;
+    this.rotationDelta_ = 0.0;
+    if (!this.handlingDownUpSequence) {
+      map.getView().setHint(ol.ViewHint.INTERACTING, 1);
+    }
+    map.render();
+    return true;
+  } else {
+    return false;
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.interaction.PinchRotate.prototype.shouldStopEvent = goog.functions.FALSE;
+
+goog.provide('ol.interaction.PinchZoom');
+
+goog.require('goog.asserts');
+goog.require('goog.functions');
+goog.require('goog.style');
+goog.require('ol');
+goog.require('ol.Coordinate');
+goog.require('ol.ViewHint');
+goog.require('ol.interaction.Interaction');
+goog.require('ol.interaction.Pointer');
+
+
+
+/**
+ * @classdesc
+ * Allows the user to zoom the map by pinching with two fingers
+ * on a touch screen.
+ *
+ * @constructor
+ * @extends {ol.interaction.Pointer}
+ * @param {olx.interaction.PinchZoomOptions=} opt_options Options.
+ * @api stable
+ */
+ol.interaction.PinchZoom = function(opt_options) {
+
+  goog.base(this, {
+    handleDownEvent: ol.interaction.PinchZoom.handleDownEvent_,
+    handleDragEvent: ol.interaction.PinchZoom.handleDragEvent_,
+    handleUpEvent: ol.interaction.PinchZoom.handleUpEvent_
+  });
+
+  var options = opt_options ? opt_options : {};
+
+  /**
+   * @private
+   * @type {ol.Coordinate}
+   */
+  this.anchor_ = null;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.duration_ = options.duration !== undefined ? options.duration : 400;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.lastDistance_ = undefined;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.lastScaleDelta_ = 1;
+
+};
+goog.inherits(ol.interaction.PinchZoom, ol.interaction.Pointer);
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @this {ol.interaction.PinchZoom}
+ * @private
+ */
+ol.interaction.PinchZoom.handleDragEvent_ = function(mapBrowserEvent) {
+  goog.asserts.assert(this.targetPointers.length >= 2,
+      'length of this.targetPointers should be 2 or more');
+  var scaleDelta = 1.0;
+
+  var touch0 = this.targetPointers[0];
+  var touch1 = this.targetPointers[1];
+  var dx = touch0.clientX - touch1.clientX;
+  var dy = touch0.clientY - touch1.clientY;
+
+  // distance between touches
+  var distance = Math.sqrt(dx * dx + dy * dy);
+
+  if (this.lastDistance_ !== undefined) {
+    scaleDelta = this.lastDistance_ / distance;
+  }
+  this.lastDistance_ = distance;
+  if (scaleDelta != 1.0) {
+    this.lastScaleDelta_ = scaleDelta;
+  }
+
+  var map = mapBrowserEvent.map;
+  var view = map.getView();
+  var resolution = view.getResolution();
+
+  // scale anchor point.
+  var viewportPosition = goog.style.getClientPosition(map.getViewport());
+  var centroid =
+      ol.interaction.Pointer.centroid(this.targetPointers);
+  centroid[0] -= viewportPosition.x;
+  centroid[1] -= viewportPosition.y;
+  this.anchor_ = map.getCoordinateFromPixel(centroid);
+
+  // scale, bypass the resolution constraint
+  map.render();
+  ol.interaction.Interaction.zoomWithoutConstraints(
+      map, view, resolution * scaleDelta, this.anchor_);
+
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @return {boolean} Stop drag sequence?
+ * @this {ol.interaction.PinchZoom}
+ * @private
+ */
+ol.interaction.PinchZoom.handleUpEvent_ = function(mapBrowserEvent) {
+  if (this.targetPointers.length < 2) {
+    var map = mapBrowserEvent.map;
+    var view = map.getView();
+    view.setHint(ol.ViewHint.INTERACTING, -1);
+    var resolution = view.getResolution();
+    // Zoom to final resolution, with an animation, and provide a
+    // direction not to zoom out/in if user was pinching in/out.
+    // Direction is > 0 if pinching out, and < 0 if pinching in.
+    var direction = this.lastScaleDelta_ - 1;
+    ol.interaction.Interaction.zoom(map, view, resolution,
+        this.anchor_, this.duration_, direction);
+    return false;
+  } else {
+    return true;
+  }
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @return {boolean} Start drag sequence?
+ * @this {ol.interaction.PinchZoom}
+ * @private
+ */
+ol.interaction.PinchZoom.handleDownEvent_ = function(mapBrowserEvent) {
+  if (this.targetPointers.length >= 2) {
+    var map = mapBrowserEvent.map;
+    this.anchor_ = null;
+    this.lastDistance_ = undefined;
+    this.lastScaleDelta_ = 1;
+    if (!this.handlingDownUpSequence) {
+      map.getView().setHint(ol.ViewHint.INTERACTING, 1);
+    }
+    map.render();
+    return true;
+  } else {
+    return false;
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.interaction.PinchZoom.prototype.shouldStopEvent = goog.functions.FALSE;
+
+goog.provide('ol.interaction');
+
+goog.require('ol');
+goog.require('ol.Collection');
+goog.require('ol.Kinetic');
+goog.require('ol.interaction.DoubleClickZoom');
+goog.require('ol.interaction.DragPan');
+goog.require('ol.interaction.DragRotate');
+goog.require('ol.interaction.DragZoom');
+goog.require('ol.interaction.KeyboardPan');
+goog.require('ol.interaction.KeyboardZoom');
+goog.require('ol.interaction.MouseWheelZoom');
+goog.require('ol.interaction.PinchRotate');
+goog.require('ol.interaction.PinchZoom');
+
+
+/**
+ * Set of interactions included in maps by default. Specific interactions can be
+ * excluded by setting the appropriate option to false in the constructor
+ * options, but the order of the interactions is fixed.  If you want to specify
+ * a different order for interactions, you will need to create your own
+ * {@link ol.interaction.Interaction} instances and insert them into a
+ * {@link ol.Collection} in the order you want before creating your
+ * {@link ol.Map} instance. The default set of interactions, in sequence, is:
+ * * {@link ol.interaction.DragRotate}
+ * * {@link ol.interaction.DoubleClickZoom}
+ * * {@link ol.interaction.DragPan}
+ * * {@link ol.interaction.PinchRotate}
+ * * {@link ol.interaction.PinchZoom}
+ * * {@link ol.interaction.KeyboardPan}
+ * * {@link ol.interaction.KeyboardZoom}
+ * * {@link ol.interaction.MouseWheelZoom}
+ * * {@link ol.interaction.DragZoom}
+ *
+ * @param {olx.interaction.DefaultsOptions=} opt_options Defaults options.
+ * @return {ol.Collection.<ol.interaction.Interaction>} A collection of
+ * interactions to be used with the ol.Map constructor's interactions option.
+ * @api stable
+ */
+ol.interaction.defaults = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  var interactions = new ol.Collection();
+
+  var kinetic = new ol.Kinetic(-0.005, 0.05, 100);
+
+  var altShiftDragRotate = options.altShiftDragRotate !== undefined ?
+      options.altShiftDragRotate : true;
+  if (altShiftDragRotate) {
+    interactions.push(new ol.interaction.DragRotate());
+  }
+
+  var doubleClickZoom = options.doubleClickZoom !== undefined ?
+      options.doubleClickZoom : true;
+  if (doubleClickZoom) {
+    interactions.push(new ol.interaction.DoubleClickZoom({
+      delta: options.zoomDelta,
+      duration: options.zoomDuration
+    }));
+  }
+
+  var dragPan = options.dragPan !== undefined ? options.dragPan : true;
+  if (dragPan) {
+    interactions.push(new ol.interaction.DragPan({
+      kinetic: kinetic
+    }));
+  }
+
+  var pinchRotate = options.pinchRotate !== undefined ? options.pinchRotate :
+      true;
+  if (pinchRotate) {
+    interactions.push(new ol.interaction.PinchRotate());
+  }
+
+  var pinchZoom = options.pinchZoom !== undefined ? options.pinchZoom : true;
+  if (pinchZoom) {
+    interactions.push(new ol.interaction.PinchZoom({
+      duration: options.zoomDuration
+    }));
+  }
+
+  var keyboard = options.keyboard !== undefined ? options.keyboard : true;
+  if (keyboard) {
+    interactions.push(new ol.interaction.KeyboardPan());
+    interactions.push(new ol.interaction.KeyboardZoom({
+      delta: options.zoomDelta,
+      duration: options.zoomDuration
+    }));
+  }
+
+  var mouseWheelZoom = options.mouseWheelZoom !== undefined ?
+      options.mouseWheelZoom : true;
+  if (mouseWheelZoom) {
+    interactions.push(new ol.interaction.MouseWheelZoom({
+      duration: options.zoomDuration
+    }));
+  }
+
+  var shiftDragZoom = options.shiftDragZoom !== undefined ?
+      options.shiftDragZoom : true;
+  if (shiftDragZoom) {
+    interactions.push(new ol.interaction.DragZoom({
+      duration: options.zoomDuration
+    }));
+  }
+
+  return interactions;
+
+};
+
+goog.provide('ol.layer.Group');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('goog.object');
+goog.require('ol.Collection');
+goog.require('ol.CollectionEvent');
+goog.require('ol.CollectionEventType');
+goog.require('ol.Object');
+goog.require('ol.ObjectEventType');
+goog.require('ol.extent');
+goog.require('ol.layer.Base');
+goog.require('ol.source.State');
+
+
+/**
+ * @enum {string}
+ */
+ol.layer.GroupProperty = {
+  LAYERS: 'layers'
+};
+
+
+
+/**
+ * @classdesc
+ * A {@link ol.Collection} of layers that are handled together.
+ *
+ * A generic `change` event is triggered when the group/Collection changes.
+ *
+ * @constructor
+ * @extends {ol.layer.Base}
+ * @param {olx.layer.GroupOptions=} opt_options Layer options.
+ * @api stable
+ */
+ol.layer.Group = function(opt_options) {
+
+  var options = opt_options || {};
+  var baseOptions = /** @type {olx.layer.GroupOptions} */
+      (goog.object.clone(options));
+  delete baseOptions.layers;
+
+  var layers = options.layers;
+
+  goog.base(this, baseOptions);
+
+  /**
+   * @private
+   * @type {Array.<goog.events.Key>}
+   */
+  this.layersListenerKeys_ = [];
+
+  /**
+   * @private
+   * @type {Object.<string, Array.<goog.events.Key>>}
+   */
+  this.listenerKeys_ = {};
+
+  goog.events.listen(this,
+      ol.Object.getChangeEventType(ol.layer.GroupProperty.LAYERS),
+      this.handleLayersChanged_, false, this);
+
+  if (layers) {
+    if (goog.isArray(layers)) {
+      layers = new ol.Collection(layers.slice());
+    } else {
+      goog.asserts.assertInstanceof(layers, ol.Collection,
+          'layers should be an ol.Collection');
+      layers = layers;
+    }
+  } else {
+    layers = new ol.Collection();
+  }
+
+  this.setLayers(layers);
+
+};
+goog.inherits(ol.layer.Group, ol.layer.Base);
+
+
+/**
+ * @private
+ */
+ol.layer.Group.prototype.handleLayerChange_ = function() {
+  if (this.getVisible()) {
+    this.changed();
+  }
+};
+
+
+/**
+ * @param {goog.events.Event} event Event.
+ * @private
+ */
+ol.layer.Group.prototype.handleLayersChanged_ = function(event) {
+  this.layersListenerKeys_.forEach(goog.events.unlistenByKey);
+  this.layersListenerKeys_.length = 0;
+
+  var layers = this.getLayers();
+  this.layersListenerKeys_.push(
+      goog.events.listen(layers, ol.CollectionEventType.ADD,
+          this.handleLayersAdd_, false, this),
+      goog.events.listen(layers, ol.CollectionEventType.REMOVE,
+          this.handleLayersRemove_, false, this));
+
+  goog.object.forEach(this.listenerKeys_, function(keys) {
+    keys.forEach(goog.events.unlistenByKey);
+  });
+  goog.object.clear(this.listenerKeys_);
+
+  var layersArray = layers.getArray();
+  var i, ii, layer;
+  for (i = 0, ii = layersArray.length; i < ii; i++) {
+    layer = layersArray[i];
+    this.listenerKeys_[goog.getUid(layer).toString()] = [
+      goog.events.listen(layer, ol.ObjectEventType.PROPERTYCHANGE,
+          this.handleLayerChange_, false, this),
+      goog.events.listen(layer, goog.events.EventType.CHANGE,
+          this.handleLayerChange_, false, this)
+    ];
+  }
+
+  this.changed();
+};
+
+
+/**
+ * @param {ol.CollectionEvent} collectionEvent Collection event.
+ * @private
+ */
+ol.layer.Group.prototype.handleLayersAdd_ = function(collectionEvent) {
+  var layer = /** @type {ol.layer.Base} */ (collectionEvent.element);
+  var key = goog.getUid(layer).toString();
+  goog.asserts.assert(!(key in this.listenerKeys_),
+      'listeners already registered');
+  this.listenerKeys_[key] = [
+    goog.events.listen(layer, ol.ObjectEventType.PROPERTYCHANGE,
+        this.handleLayerChange_, false, this),
+    goog.events.listen(layer, goog.events.EventType.CHANGE,
+        this.handleLayerChange_, false, this)
+  ];
+  this.changed();
+};
+
+
+/**
+ * @param {ol.CollectionEvent} collectionEvent Collection event.
+ * @private
+ */
+ol.layer.Group.prototype.handleLayersRemove_ = function(collectionEvent) {
+  var layer = /** @type {ol.layer.Base} */ (collectionEvent.element);
+  var key = goog.getUid(layer).toString();
+  goog.asserts.assert(key in this.listenerKeys_, 'no listeners to unregister');
+  this.listenerKeys_[key].forEach(goog.events.unlistenByKey);
+  delete this.listenerKeys_[key];
+  this.changed();
+};
+
+
+/**
+ * Returns the {@link ol.Collection collection} of {@link ol.layer.Layer layers}
+ * in this group.
+ * @return {!ol.Collection.<ol.layer.Base>} Collection of
+ *   {@link ol.layer.Base layers} that are part of this group.
+ * @observable
+ * @api stable
+ */
+ol.layer.Group.prototype.getLayers = function() {
+  return /** @type {!ol.Collection.<ol.layer.Base>} */ (this.get(
+      ol.layer.GroupProperty.LAYERS));
+};
+
+
+/**
+ * Set the {@link ol.Collection collection} of {@link ol.layer.Layer layers}
+ * in this group.
+ * @param {!ol.Collection.<ol.layer.Base>} layers Collection of
+ *   {@link ol.layer.Base layers} that are part of this group.
+ * @observable
+ * @api stable
+ */
+ol.layer.Group.prototype.setLayers = function(layers) {
+  this.set(ol.layer.GroupProperty.LAYERS, layers);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.layer.Group.prototype.getLayersArray = function(opt_array) {
+  var array = opt_array !== undefined ? opt_array : [];
+  this.getLayers().forEach(function(layer) {
+    layer.getLayersArray(array);
+  });
+  return array;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.layer.Group.prototype.getLayerStatesArray = function(opt_states) {
+  var states = opt_states !== undefined ? opt_states : [];
+
+  var pos = states.length;
+
+  this.getLayers().forEach(function(layer) {
+    layer.getLayerStatesArray(states);
+  });
+
+  var ownLayerState = this.getLayerState();
+  var i, ii, layerState;
+  for (i = pos, ii = states.length; i < ii; i++) {
+    layerState = states[i];
+    layerState.opacity *= ownLayerState.opacity;
+    layerState.visible = layerState.visible && ownLayerState.visible;
+    layerState.maxResolution = Math.min(
+        layerState.maxResolution, ownLayerState.maxResolution);
+    layerState.minResolution = Math.max(
+        layerState.minResolution, ownLayerState.minResolution);
+    if (ownLayerState.extent !== undefined) {
+      if (layerState.extent !== undefined) {
+        layerState.extent = ol.extent.getIntersection(
+            layerState.extent, ownLayerState.extent);
+      } else {
+        layerState.extent = ownLayerState.extent;
+      }
+    }
+  }
+
+  return states;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.layer.Group.prototype.getSourceState = function() {
+  return ol.source.State.READY;
+};
+
+goog.provide('ol.proj.EPSG3857');
+
+goog.require('goog.asserts');
+goog.require('ol.math');
+goog.require('ol.proj');
+goog.require('ol.proj.Projection');
+goog.require('ol.proj.Units');
+
+
+
+/**
+ * @classdesc
+ * Projection object for web/spherical Mercator (EPSG:3857).
+ *
+ * @constructor
+ * @extends {ol.proj.Projection}
+ * @param {string} code Code.
+ * @private
+ */
+ol.proj.EPSG3857_ = function(code) {
+  goog.base(this, {
+    code: code,
+    units: ol.proj.Units.METERS,
+    extent: ol.proj.EPSG3857.EXTENT,
+    global: true,
+    worldExtent: ol.proj.EPSG3857.WORLD_EXTENT
+  });
+};
+goog.inherits(ol.proj.EPSG3857_, ol.proj.Projection);
+
+
+/**
+ * @inheritDoc
+ */
+ol.proj.EPSG3857_.prototype.getPointResolution = function(resolution, point) {
+  return resolution / ol.math.cosh(point[1] / ol.proj.EPSG3857.RADIUS);
+};
+
+
+/**
+ * @const
+ * @type {number}
+ */
+ol.proj.EPSG3857.RADIUS = 6378137;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+ol.proj.EPSG3857.HALF_SIZE = Math.PI * ol.proj.EPSG3857.RADIUS;
+
+
+/**
+ * @const
+ * @type {ol.Extent}
+ */
+ol.proj.EPSG3857.EXTENT = [
+  -ol.proj.EPSG3857.HALF_SIZE, -ol.proj.EPSG3857.HALF_SIZE,
+  ol.proj.EPSG3857.HALF_SIZE, ol.proj.EPSG3857.HALF_SIZE
+];
+
+
+/**
+ * @const
+ * @type {ol.Extent}
+ */
+ol.proj.EPSG3857.WORLD_EXTENT = [-180, -85, 180, 85];
+
+
+/**
+ * Lists several projection codes with the same meaning as EPSG:3857.
+ *
+ * @type {Array.<string>}
+ */
+ol.proj.EPSG3857.CODES = [
+  'EPSG:3857',
+  'EPSG:102100',
+  'EPSG:102113',
+  'EPSG:900913',
+  'urn:ogc:def:crs:EPSG:6.18:3:3857',
+  'urn:ogc:def:crs:EPSG::3857',
+  'http://www.opengis.net/gml/srs/epsg.xml#3857'
+];
+
+
+/**
+ * Projections equal to EPSG:3857.
+ *
+ * @const
+ * @type {Array.<ol.proj.Projection>}
+ */
+ol.proj.EPSG3857.PROJECTIONS = ol.proj.EPSG3857.CODES.map(function(code) {
+  return new ol.proj.EPSG3857_(code);
+});
+
+
+/**
+ * Transformation from EPSG:4326 to EPSG:3857.
+ *
+ * @param {Array.<number>} input Input array of coordinate values.
+ * @param {Array.<number>=} opt_output Output array of coordinate values.
+ * @param {number=} opt_dimension Dimension (default is `2`).
+ * @return {Array.<number>} Output array of coordinate values.
+ */
+ol.proj.EPSG3857.fromEPSG4326 = function(input, opt_output, opt_dimension) {
+  var length = input.length,
+      dimension = opt_dimension > 1 ? opt_dimension : 2,
+      output = opt_output;
+  if (output === undefined) {
+    if (dimension > 2) {
+      // preserve values beyond second dimension
+      output = input.slice();
+    } else {
+      output = new Array(length);
+    }
+  }
+  goog.asserts.assert(output.length % dimension === 0,
+      'modulus of output.length with dimension should be 0');
+  for (var i = 0; i < length; i += dimension) {
+    output[i] = ol.proj.EPSG3857.RADIUS * Math.PI * input[i] / 180;
+    output[i + 1] = ol.proj.EPSG3857.RADIUS *
+        Math.log(Math.tan(Math.PI * (input[i + 1] + 90) / 360));
+  }
+  return output;
+};
+
+
+/**
+ * Transformation from EPSG:3857 to EPSG:4326.
+ *
+ * @param {Array.<number>} input Input array of coordinate values.
+ * @param {Array.<number>=} opt_output Output array of coordinate values.
+ * @param {number=} opt_dimension Dimension (default is `2`).
+ * @return {Array.<number>} Output array of coordinate values.
+ */
+ol.proj.EPSG3857.toEPSG4326 = function(input, opt_output, opt_dimension) {
+  var length = input.length,
+      dimension = opt_dimension > 1 ? opt_dimension : 2,
+      output = opt_output;
+  if (output === undefined) {
+    if (dimension > 2) {
+      // preserve values beyond second dimension
+      output = input.slice();
+    } else {
+      output = new Array(length);
+    }
+  }
+  goog.asserts.assert(output.length % dimension === 0,
+      'modulus of output.length with dimension should be 0');
+  for (var i = 0; i < length; i += dimension) {
+    output[i] = 180 * input[i] / (ol.proj.EPSG3857.RADIUS * Math.PI);
+    output[i + 1] = 360 * Math.atan(
+        Math.exp(input[i + 1] / ol.proj.EPSG3857.RADIUS)) / Math.PI - 90;
+  }
+  return output;
+};
+
+goog.provide('ol.proj.EPSG4326');
+
+goog.require('ol.proj');
+goog.require('ol.proj.Projection');
+goog.require('ol.proj.Units');
+
+
+
+/**
+ * @classdesc
+ * Projection object for WGS84 geographic coordinates (EPSG:4326).
+ *
+ * Note that OpenLayers does not strictly comply with the EPSG definition.
+ * The EPSG registry defines 4326 as a CRS for Latitude,Longitude (y,x).
+ * OpenLayers treats EPSG:4326 as a pseudo-projection, with x,y coordinates.
+ *
+ * @constructor
+ * @extends {ol.proj.Projection}
+ * @param {string} code Code.
+ * @param {string=} opt_axisOrientation Axis orientation.
+ * @private
+ */
+ol.proj.EPSG4326_ = function(code, opt_axisOrientation) {
+  goog.base(this, {
+    code: code,
+    units: ol.proj.Units.DEGREES,
+    extent: ol.proj.EPSG4326.EXTENT,
+    axisOrientation: opt_axisOrientation,
+    global: true,
+    worldExtent: ol.proj.EPSG4326.EXTENT
+  });
+};
+goog.inherits(ol.proj.EPSG4326_, ol.proj.Projection);
+
+
+/**
+ * @inheritDoc
+ */
+ol.proj.EPSG4326_.prototype.getPointResolution = function(resolution, point) {
+  return resolution;
+};
+
+
+/**
+ * Extent of the EPSG:4326 projection which is the whole world.
+ *
+ * @const
+ * @type {ol.Extent}
+ */
+ol.proj.EPSG4326.EXTENT = [-180, -90, 180, 90];
+
+
+/**
+ * Projections equal to EPSG:4326.
+ *
+ * @const
+ * @type {Array.<ol.proj.Projection>}
+ */
+ol.proj.EPSG4326.PROJECTIONS = [
+  new ol.proj.EPSG4326_('CRS:84'),
+  new ol.proj.EPSG4326_('EPSG:4326', 'neu'),
+  new ol.proj.EPSG4326_('urn:ogc:def:crs:EPSG::4326', 'neu'),
+  new ol.proj.EPSG4326_('urn:ogc:def:crs:EPSG:6.6:4326', 'neu'),
+  new ol.proj.EPSG4326_('urn:ogc:def:crs:OGC:1.3:CRS84'),
+  new ol.proj.EPSG4326_('urn:ogc:def:crs:OGC:2:84'),
+  new ol.proj.EPSG4326_('http://www.opengis.net/gml/srs/epsg.xml#4326', 'neu'),
+  new ol.proj.EPSG4326_('urn:x-ogc:def:crs:EPSG:4326', 'neu')
+];
+
+goog.provide('ol.proj.common');
+
+goog.require('ol.proj');
+goog.require('ol.proj.EPSG3857');
+goog.require('ol.proj.EPSG4326');
+
+
+/**
+ * FIXME empty description for jsdoc
+ * @api
+ */
+ol.proj.common.add = function() {
+  // Add transformations that don't alter coordinates to convert within set of
+  // projections with equal meaning.
+  ol.proj.addEquivalentProjections(ol.proj.EPSG3857.PROJECTIONS);
+  ol.proj.addEquivalentProjections(ol.proj.EPSG4326.PROJECTIONS);
+  // Add transformations to convert EPSG:4326 like coordinates to EPSG:3857 like
+  // coordinates and back.
+  ol.proj.addEquivalentTransforms(
+      ol.proj.EPSG4326.PROJECTIONS,
+      ol.proj.EPSG3857.PROJECTIONS,
+      ol.proj.EPSG3857.fromEPSG4326,
+      ol.proj.EPSG3857.toEPSG4326);
+};
+
+goog.provide('ol.layer.Image');
+
+goog.require('ol.layer.Layer');
+
+
+
+/**
+ * @classdesc
+ * Server-rendered images that are available for arbitrary extents and
+ * resolutions.
+ * Note that any property set in the options is set as a {@link ol.Object}
+ * property on the layer object; for example, setting `title: 'My Title'` in the
+ * options means that `title` is observable, and has get/set accessors.
+ *
+ * @constructor
+ * @extends {ol.layer.Layer}
+ * @fires ol.render.Event
+ * @param {olx.layer.ImageOptions=} opt_options Layer options.
+ * @api stable
+ */
+ol.layer.Image = function(opt_options) {
+  var options = opt_options ? opt_options : {};
+  goog.base(this,  /** @type {olx.layer.LayerOptions} */ (options));
+};
+goog.inherits(ol.layer.Image, ol.layer.Layer);
+
+
+/**
+ * Return the associated {@link ol.source.Image source} of the image layer.
+ * @function
+ * @return {ol.source.Image} Source.
+ * @api stable
+ */
+ol.layer.Image.prototype.getSource;
+
+goog.provide('ol.layer.Tile');
+
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.layer.Layer');
+
+
+/**
+ * @enum {string}
+ */
+ol.layer.TileProperty = {
+  PRELOAD: 'preload',
+  USE_INTERIM_TILES_ON_ERROR: 'useInterimTilesOnError'
+};
+
+
+
+/**
+ * @classdesc
+ * For layer sources that provide pre-rendered, tiled images in grids that are
+ * organized by zoom levels for specific resolutions.
+ * Note that any property set in the options is set as a {@link ol.Object}
+ * property on the layer object; for example, setting `title: 'My Title'` in the
+ * options means that `title` is observable, and has get/set accessors.
+ *
+ * @constructor
+ * @extends {ol.layer.Layer}
+ * @fires ol.render.Event
+ * @param {olx.layer.TileOptions=} opt_options Tile layer options.
+ * @api stable
+ */
+ol.layer.Tile = function(opt_options) {
+  var options = opt_options ? opt_options : {};
+
+  var baseOptions = goog.object.clone(options);
+
+  delete baseOptions.preload;
+  delete baseOptions.useInterimTilesOnError;
+  goog.base(this,  /** @type {olx.layer.LayerOptions} */ (baseOptions));
+
+  this.setPreload(options.preload !== undefined ? options.preload : 0);
+  this.setUseInterimTilesOnError(options.useInterimTilesOnError !== undefined ?
+      options.useInterimTilesOnError : true);
+};
+goog.inherits(ol.layer.Tile, ol.layer.Layer);
+
+
+/**
+ * Return the level as number to which we will preload tiles up to.
+ * @return {number} The level to preload tiles up to.
+ * @observable
+ * @api
+ */
+ol.layer.Tile.prototype.getPreload = function() {
+  return /** @type {number} */ (this.get(ol.layer.TileProperty.PRELOAD));
+};
+
+
+/**
+ * Return the associated {@link ol.source.Tile tilesource} of the layer.
+ * @function
+ * @return {ol.source.Tile} Source.
+ * @api stable
+ */
+ol.layer.Tile.prototype.getSource;
+
+
+/**
+ * Set the level as number to which we will preload tiles up to.
+ * @param {number} preload The level to preload tiles up to.
+ * @observable
+ * @api
+ */
+ol.layer.Tile.prototype.setPreload = function(preload) {
+  this.set(ol.layer.TileProperty.PRELOAD, preload);
+};
+
+
+/**
+ * Whether we use interim tiles on error.
+ * @return {boolean} Use interim tiles on error.
+ * @observable
+ * @api
+ */
+ol.layer.Tile.prototype.getUseInterimTilesOnError = function() {
+  return /** @type {boolean} */ (
+      this.get(ol.layer.TileProperty.USE_INTERIM_TILES_ON_ERROR));
+};
+
+
+/**
+ * Set whether we use interim tiles on error.
+ * @param {boolean} useInterimTilesOnError Use interim tiles on error.
+ * @observable
+ * @api
+ */
+ol.layer.Tile.prototype.setUseInterimTilesOnError =
+    function(useInterimTilesOnError) {
+  this.set(
+      ol.layer.TileProperty.USE_INTERIM_TILES_ON_ERROR, useInterimTilesOnError);
+};
+
+goog.provide('ol.render.canvas');
+
+
+/**
+ * @typedef {{fillStyle: string}}
+ */
+ol.render.canvas.FillState;
+
+
+/**
+ * @typedef {{lineCap: string,
+ *            lineDash: Array.<number>,
+ *            lineJoin: string,
+ *            lineWidth: number,
+ *            miterLimit: number,
+ *            strokeStyle: string}}
+ */
+ol.render.canvas.StrokeState;
+
+
+/**
+ * @typedef {{font: string,
+ *            textAlign: string,
+ *            textBaseline: string}}
+ */
+ol.render.canvas.TextState;
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.render.canvas.defaultFont = '10px sans-serif';
+
+
+/**
+ * @const
+ * @type {ol.Color}
+ */
+ol.render.canvas.defaultFillStyle = [0, 0, 0, 1];
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.render.canvas.defaultLineCap = 'round';
+
+
+/**
+ * @const
+ * @type {Array.<number>}
+ */
+ol.render.canvas.defaultLineDash = [];
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.render.canvas.defaultLineJoin = 'round';
+
+
+/**
+ * @const
+ * @type {number}
+ */
+ol.render.canvas.defaultMiterLimit = 10;
+
+
+/**
+ * @const
+ * @type {ol.Color}
+ */
+ol.render.canvas.defaultStrokeStyle = [0, 0, 0, 1];
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.render.canvas.defaultTextAlign = 'center';
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.render.canvas.defaultTextBaseline = 'middle';
+
+
+/**
+ * @const
+ * @type {number}
+ */
+ol.render.canvas.defaultLineWidth = 1;
+
+goog.provide('ol.structs.IHasChecksum');
+
+
+
+/**
+ * @interface
+ */
+ol.structs.IHasChecksum = function() {
+};
+
+
+/**
+ * @return {string} The checksum.
+ */
+ol.structs.IHasChecksum.prototype.getChecksum = function() {
+};
+
+goog.provide('ol.style.Fill');
+
+goog.require('ol.color');
+goog.require('ol.structs.IHasChecksum');
+
+
+
+/**
+ * @classdesc
+ * Set fill style for vector features.
+ *
+ * @constructor
+ * @param {olx.style.FillOptions=} opt_options Options.
+ * @implements {ol.structs.IHasChecksum}
+ * @api
+ */
+ol.style.Fill = function(opt_options) {
+
+  var options = opt_options || {};
+
+  /**
+   * @private
+   * @type {ol.Color|string}
+   */
+  this.color_ = options.color !== undefined ? options.color : null;
+
+  /**
+   * @private
+   * @type {string|undefined}
+   */
+  this.checksum_ = undefined;
+};
+
+
+/**
+ * Get the fill color.
+ * @return {ol.Color|string} Color.
+ * @api
+ */
+ol.style.Fill.prototype.getColor = function() {
+  return this.color_;
+};
+
+
+/**
+ * Set the color.
+ *
+ * @param {ol.Color|string} color Color.
+ * @api
+ */
+ol.style.Fill.prototype.setColor = function(color) {
+  this.color_ = color;
+  this.checksum_ = undefined;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Fill.prototype.getChecksum = function() {
+  if (this.checksum_ === undefined) {
+    this.checksum_ = 'f' + (this.color_ ?
+        ol.color.asString(this.color_) : '-');
+  }
+
+  return this.checksum_;
+};
+
+// Copyright 2008 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Namespace with crypto related helper functions.
+ */
+
+goog.provide('goog.crypt');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+
+
+/**
+ * Turns a string into an array of bytes; a "byte" being a JS number in the
+ * range 0-255.
+ * @param {string} str String value to arrify.
+ * @return {!Array<number>} Array of numbers corresponding to the
+ *     UCS character codes of each character in str.
+ */
+goog.crypt.stringToByteArray = function(str) {
+  var output = [], p = 0;
+  for (var i = 0; i < str.length; i++) {
+    var c = str.charCodeAt(i);
+    while (c > 0xff) {
+      output[p++] = c & 0xff;
+      c >>= 8;
+    }
+    output[p++] = c;
+  }
+  return output;
+};
+
+
+/**
+ * Turns an array of numbers into the string given by the concatenation of the
+ * characters to which the numbers correspond.
+ * @param {Array<number>} bytes Array of numbers representing characters.
+ * @return {string} Stringification of the array.
+ */
+goog.crypt.byteArrayToString = function(bytes) {
+  var CHUNK_SIZE = 8192;
+
+  // Special-case the simple case for speed's sake.
+  if (bytes.length <= CHUNK_SIZE) {
+    return String.fromCharCode.apply(null, bytes);
+  }
+
+  // The remaining logic splits conversion by chunks since
+  // Function#apply() has a maximum parameter count.
+  // See discussion: http://goo.gl/LrWmZ9
+
+  var str = '';
+  for (var i = 0; i < bytes.length; i += CHUNK_SIZE) {
+    var chunk = goog.array.slice(bytes, i, i + CHUNK_SIZE);
+    str += String.fromCharCode.apply(null, chunk);
+  }
+  return str;
+};
+
+
+/**
+ * Turns an array of numbers into the hex string given by the concatenation of
+ * the hex values to which the numbers correspond.
+ * @param {Uint8Array|Array<number>} array Array of numbers representing
+ *     characters.
+ * @return {string} Hex string.
+ */
+goog.crypt.byteArrayToHex = function(array) {
+  return goog.array.map(array, function(numByte) {
+    var hexByte = numByte.toString(16);
+    return hexByte.length > 1 ? hexByte : '0' + hexByte;
+  }).join('');
+};
+
+
+/**
+ * Converts a hex string into an integer array.
+ * @param {string} hexString Hex string of 16-bit integers (two characters
+ *     per integer).
+ * @return {!Array<number>} Array of {0,255} integers for the given string.
+ */
+goog.crypt.hexToByteArray = function(hexString) {
+  goog.asserts.assert(hexString.length % 2 == 0,
+                      'Key string length must be multiple of 2');
+  var arr = [];
+  for (var i = 0; i < hexString.length; i += 2) {
+    arr.push(parseInt(hexString.substring(i, i + 2), 16));
+  }
+  return arr;
+};
+
+
+/**
+ * Converts a JS string to a UTF-8 "byte" array.
+ * @param {string} str 16-bit unicode string.
+ * @return {!Array<number>} UTF-8 byte array.
+ */
+goog.crypt.stringToUtf8ByteArray = function(str) {
+  // TODO(user): Use native implementations if/when available
+  var out = [], p = 0;
+  for (var i = 0; i < str.length; i++) {
+    var c = str.charCodeAt(i);
+    if (c < 128) {
+      out[p++] = c;
+    } else if (c < 2048) {
+      out[p++] = (c >> 6) | 192;
+      out[p++] = (c & 63) | 128;
+    } else {
+      out[p++] = (c >> 12) | 224;
+      out[p++] = ((c >> 6) & 63) | 128;
+      out[p++] = (c & 63) | 128;
+    }
+  }
+  return out;
+};
+
+
+/**
+ * Converts a UTF-8 byte array to JavaScript's 16-bit Unicode.
+ * @param {Uint8Array|Array<number>} bytes UTF-8 byte array.
+ * @return {string} 16-bit Unicode string.
+ */
+goog.crypt.utf8ByteArrayToString = function(bytes) {
+  // TODO(user): Use native implementations if/when available
+  var out = [], pos = 0, c = 0;
+  while (pos < bytes.length) {
+    var c1 = bytes[pos++];
+    if (c1 < 128) {
+      out[c++] = String.fromCharCode(c1);
+    } else if (c1 > 191 && c1 < 224) {
+      var c2 = bytes[pos++];
+      out[c++] = String.fromCharCode((c1 & 31) << 6 | c2 & 63);
+    } else {
+      var c2 = bytes[pos++];
+      var c3 = bytes[pos++];
+      out[c++] = String.fromCharCode(
+          (c1 & 15) << 12 | (c2 & 63) << 6 | c3 & 63);
+    }
+  }
+  return out.join('');
+};
+
+
+/**
+ * XOR two byte arrays.
+ * @param {!ArrayBufferView|!Array<number>} bytes1 Byte array 1.
+ * @param {!ArrayBufferView|!Array<number>} bytes2 Byte array 2.
+ * @return {!Array<number>} Resulting XOR of the two byte arrays.
+ */
+goog.crypt.xorByteArray = function(bytes1, bytes2) {
+  goog.asserts.assert(
+      bytes1.length == bytes2.length,
+      'XOR array lengths must match');
+
+  var result = [];
+  for (var i = 0; i < bytes1.length; i++) {
+    result.push(bytes1[i] ^ bytes2[i]);
+  }
+  return result;
+};
+
+// Copyright 2011 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Abstract cryptographic hash interface.
+ *
+ * See goog.crypt.Sha1 and goog.crypt.Md5 for sample implementations.
+ *
+ */
+
+goog.provide('goog.crypt.Hash');
+
+
+
+/**
+ * Create a cryptographic hash instance.
+ *
+ * @constructor
+ * @struct
+ */
+goog.crypt.Hash = function() {
+  /**
+   * The block size for the hasher.
+   * @type {number}
+   */
+  this.blockSize = -1;
+};
+
+
+/**
+ * Resets the internal accumulator.
+ */
+goog.crypt.Hash.prototype.reset = goog.abstractMethod;
+
+
+/**
+ * Adds a byte array (array with values in [0-255] range) or a string (might
+ * only contain 8-bit, i.e., Latin1 characters) to the internal accumulator.
+ *
+ * Many hash functions operate on blocks of data and implement optimizations
+ * when a full chunk of data is readily available. Hence it is often preferable
+ * to provide large chunks of data (a kilobyte or more) than to repeatedly
+ * call the update method with few tens of bytes. If this is not possible, or
+ * not feasible, it might be good to provide data in multiplies of hash block
+ * size (often 64 bytes). Please see the implementation and performance tests
+ * of your favourite hash.
+ *
+ * @param {Array<number>|Uint8Array|string} bytes Data used for the update.
+ * @param {number=} opt_length Number of bytes to use.
+ */
+goog.crypt.Hash.prototype.update = goog.abstractMethod;
+
+
+/**
+ * @return {!Array<number>} The finalized hash computed
+ *     from the internal accumulator.
+ */
+goog.crypt.Hash.prototype.digest = goog.abstractMethod;
+
+// Copyright 2011 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview MD5 cryptographic hash.
+ * Implementation of http://tools.ietf.org/html/rfc1321 with common
+ * optimizations and tweaks (see http://en.wikipedia.org/wiki/MD5).
+ *
+ * Usage:
+ *   var md5 = new goog.crypt.Md5();
+ *   md5.update(bytes);
+ *   var hash = md5.digest();
+ *
+ * Performance:
+ *   Chrome 23              ~680 Mbit/s
+ *   Chrome 13 (in a VM)    ~250 Mbit/s
+ *   Firefox 6.0 (in a VM)  ~100 Mbit/s
+ *   IE9 (in a VM)           ~27 Mbit/s
+ *   Firefox 3.6             ~15 Mbit/s
+ *   IE8 (in a VM)           ~13 Mbit/s
+ *
+ */
+
+goog.provide('goog.crypt.Md5');
+
+goog.require('goog.crypt.Hash');
+
+
+
+/**
+ * MD5 cryptographic hash constructor.
+ * @constructor
+ * @extends {goog.crypt.Hash}
+ * @final
+ * @struct
+ */
+goog.crypt.Md5 = function() {
+  goog.crypt.Md5.base(this, 'constructor');
+
+  this.blockSize = 512 / 8;
+
+  /**
+   * Holds the current values of accumulated A-D variables (MD buffer).
+   * @type {!Array<number>}
+   * @private
+   */
+  this.chain_ = new Array(4);
+
+  /**
+   * A buffer holding the data until the whole block can be processed.
+   * @type {!Array<number>}
+   * @private
+   */
+  this.block_ = new Array(this.blockSize);
+
+  /**
+   * The length of yet-unprocessed data as collected in the block.
+   * @type {number}
+   * @private
+   */
+  this.blockLength_ = 0;
+
+  /**
+   * The total length of the message so far.
+   * @type {number}
+   * @private
+   */
+  this.totalLength_ = 0;
+
+  this.reset();
+};
+goog.inherits(goog.crypt.Md5, goog.crypt.Hash);
+
+
+/**
+ * Integer rotation constants used by the abbreviated implementation.
+ * They are hardcoded in the unrolled implementation, so it is left
+ * here commented out.
+ * @type {Array<number>}
+ * @private
+ *
+goog.crypt.Md5.S_ = [
+  7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
+  5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20,
+  4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
+  6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21
+];
+ */
+
+/**
+ * Sine function constants used by the abbreviated implementation.
+ * They are hardcoded in the unrolled implementation, so it is left
+ * here commented out.
+ * @type {Array<number>}
+ * @private
+ *
+goog.crypt.Md5.T_ = [
+  0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
+  0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
+  0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
+  0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
+  0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
+  0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
+  0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
+  0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
+  0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
+  0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
+  0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
+  0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
+  0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
+  0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
+  0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
+  0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
+];
+ */
+
+
+/** @override */
+goog.crypt.Md5.prototype.reset = function() {
+  this.chain_[0] = 0x67452301;
+  this.chain_[1] = 0xefcdab89;
+  this.chain_[2] = 0x98badcfe;
+  this.chain_[3] = 0x10325476;
+
+  this.blockLength_ = 0;
+  this.totalLength_ = 0;
+};
+
+
+/**
+ * Internal compress helper function. It takes a block of data (64 bytes)
+ * and updates the accumulator.
+ * @param {Array<number>|Uint8Array|string} buf The block to compress.
+ * @param {number=} opt_offset Offset of the block in the buffer.
+ * @private
+ */
+goog.crypt.Md5.prototype.compress_ = function(buf, opt_offset) {
+  if (!opt_offset) {
+    opt_offset = 0;
+  }
+
+  // We allocate the array every time, but it's cheap in practice.
+  var X = new Array(16);
+
+  // Get 16 little endian words. It is not worth unrolling this for Chrome 11.
+  if (goog.isString(buf)) {
+    for (var i = 0; i < 16; ++i) {
+      X[i] = (buf.charCodeAt(opt_offset++)) |
+             (buf.charCodeAt(opt_offset++) << 8) |
+             (buf.charCodeAt(opt_offset++) << 16) |
+             (buf.charCodeAt(opt_offset++) << 24);
+    }
+  } else {
+    for (var i = 0; i < 16; ++i) {
+      X[i] = (buf[opt_offset++]) |
+             (buf[opt_offset++] << 8) |
+             (buf[opt_offset++] << 16) |
+             (buf[opt_offset++] << 24);
+    }
+  }
+
+  var A = this.chain_[0];
+  var B = this.chain_[1];
+  var C = this.chain_[2];
+  var D = this.chain_[3];
+  var sum = 0;
+
+  /*
+   * This is an abbreviated implementation, it is left here commented out for
+   * reference purposes. See below for an unrolled version in use.
+   *
+  var f, n, tmp;
+  for (var i = 0; i < 64; ++i) {
+
+    if (i < 16) {
+      f = (D ^ (B & (C ^ D)));
+      n = i;
+    } else if (i < 32) {
+      f = (C ^ (D & (B ^ C)));
+      n = (5 * i + 1) % 16;
+    } else if (i < 48) {
+      f = (B ^ C ^ D);
+      n = (3 * i + 5) % 16;
+    } else {
+      f = (C ^ (B | (~D)));
+      n = (7 * i) % 16;
+    }
+
+    tmp = D;
+    D = C;
+    C = B;
+    sum = (A + f + goog.crypt.Md5.T_[i] + X[n]) & 0xffffffff;
+    B += ((sum << goog.crypt.Md5.S_[i]) & 0xffffffff) |
+         (sum >>> (32 - goog.crypt.Md5.S_[i]));
+    A = tmp;
+  }
+   */
+
+  /*
+   * This is an unrolled MD5 implementation, which gives ~30% speedup compared
+   * to the abbreviated implementation above, as measured on Chrome 11. It is
+   * important to keep 32-bit croppings to minimum and inline the integer
+   * rotation.
+   */
+  sum = (A + (D ^ (B & (C ^ D))) + X[0] + 0xd76aa478) & 0xffffffff;
+  A = B + (((sum << 7) & 0xffffffff) | (sum >>> 25));
+  sum = (D + (C ^ (A & (B ^ C))) + X[1] + 0xe8c7b756) & 0xffffffff;
+  D = A + (((sum << 12) & 0xffffffff) | (sum >>> 20));
+  sum = (C + (B ^ (D & (A ^ B))) + X[2] + 0x242070db) & 0xffffffff;
+  C = D + (((sum << 17) & 0xffffffff) | (sum >>> 15));
+  sum = (B + (A ^ (C & (D ^ A))) + X[3] + 0xc1bdceee) & 0xffffffff;
+  B = C + (((sum << 22) & 0xffffffff) | (sum >>> 10));
+  sum = (A + (D ^ (B & (C ^ D))) + X[4] + 0xf57c0faf) & 0xffffffff;
+  A = B + (((sum << 7) & 0xffffffff) | (sum >>> 25));
+  sum = (D + (C ^ (A & (B ^ C))) + X[5] + 0x4787c62a) & 0xffffffff;
+  D = A + (((sum << 12) & 0xffffffff) | (sum >>> 20));
+  sum = (C + (B ^ (D & (A ^ B))) + X[6] + 0xa8304613) & 0xffffffff;
+  C = D + (((sum << 17) & 0xffffffff) | (sum >>> 15));
+  sum = (B + (A ^ (C & (D ^ A))) + X[7] + 0xfd469501) & 0xffffffff;
+  B = C + (((sum << 22) & 0xffffffff) | (sum >>> 10));
+  sum = (A + (D ^ (B & (C ^ D))) + X[8] + 0x698098d8) & 0xffffffff;
+  A = B + (((sum << 7) & 0xffffffff) | (sum >>> 25));
+  sum = (D + (C ^ (A & (B ^ C))) + X[9] + 0x8b44f7af) & 0xffffffff;
+  D = A + (((sum << 12) & 0xffffffff) | (sum >>> 20));
+  sum = (C + (B ^ (D & (A ^ B))) + X[10] + 0xffff5bb1) & 0xffffffff;
+  C = D + (((sum << 17) & 0xffffffff) | (sum >>> 15));
+  sum = (B + (A ^ (C & (D ^ A))) + X[11] + 0x895cd7be) & 0xffffffff;
+  B = C + (((sum << 22) & 0xffffffff) | (sum >>> 10));
+  sum = (A + (D ^ (B & (C ^ D))) + X[12] + 0x6b901122) & 0xffffffff;
+  A = B + (((sum << 7) & 0xffffffff) | (sum >>> 25));
+  sum = (D + (C ^ (A & (B ^ C))) + X[13] + 0xfd987193) & 0xffffffff;
+  D = A + (((sum << 12) & 0xffffffff) | (sum >>> 20));
+  sum = (C + (B ^ (D & (A ^ B))) + X[14] + 0xa679438e) & 0xffffffff;
+  C = D + (((sum << 17) & 0xffffffff) | (sum >>> 15));
+  sum = (B + (A ^ (C & (D ^ A))) + X[15] + 0x49b40821) & 0xffffffff;
+  B = C + (((sum << 22) & 0xffffffff) | (sum >>> 10));
+  sum = (A + (C ^ (D & (B ^ C))) + X[1] + 0xf61e2562) & 0xffffffff;
+  A = B + (((sum << 5) & 0xffffffff) | (sum >>> 27));
+  sum = (D + (B ^ (C & (A ^ B))) + X[6] + 0xc040b340) & 0xffffffff;
+  D = A + (((sum << 9) & 0xffffffff) | (sum >>> 23));
+  sum = (C + (A ^ (B & (D ^ A))) + X[11] + 0x265e5a51) & 0xffffffff;
+  C = D + (((sum << 14) & 0xffffffff) | (sum >>> 18));
+  sum = (B + (D ^ (A & (C ^ D))) + X[0] + 0xe9b6c7aa) & 0xffffffff;
+  B = C + (((sum << 20) & 0xffffffff) | (sum >>> 12));
+  sum = (A + (C ^ (D & (B ^ C))) + X[5] + 0xd62f105d) & 0xffffffff;
+  A = B + (((sum << 5) & 0xffffffff) | (sum >>> 27));
+  sum = (D + (B ^ (C & (A ^ B))) + X[10] + 0x02441453) & 0xffffffff;
+  D = A + (((sum << 9) & 0xffffffff) | (sum >>> 23));
+  sum = (C + (A ^ (B & (D ^ A))) + X[15] + 0xd8a1e681) & 0xffffffff;
+  C = D + (((sum << 14) & 0xffffffff) | (sum >>> 18));
+  sum = (B + (D ^ (A & (C ^ D))) + X[4] + 0xe7d3fbc8) & 0xffffffff;
+  B = C + (((sum << 20) & 0xffffffff) | (sum >>> 12));
+  sum = (A + (C ^ (D & (B ^ C))) + X[9] + 0x21e1cde6) & 0xffffffff;
+  A = B + (((sum << 5) & 0xffffffff) | (sum >>> 27));
+  sum = (D + (B ^ (C & (A ^ B))) + X[14] + 0xc33707d6) & 0xffffffff;
+  D = A + (((sum << 9) & 0xffffffff) | (sum >>> 23));
+  sum = (C + (A ^ (B & (D ^ A))) + X[3] + 0xf4d50d87) & 0xffffffff;
+  C = D + (((sum << 14) & 0xffffffff) | (sum >>> 18));
+  sum = (B + (D ^ (A & (C ^ D))) + X[8] + 0x455a14ed) & 0xffffffff;
+  B = C + (((sum << 20) & 0xffffffff) | (sum >>> 12));
+  sum = (A + (C ^ (D & (B ^ C))) + X[13] + 0xa9e3e905) & 0xffffffff;
+  A = B + (((sum << 5) & 0xffffffff) | (sum >>> 27));
+  sum = (D + (B ^ (C & (A ^ B))) + X[2] + 0xfcefa3f8) & 0xffffffff;
+  D = A + (((sum << 9) & 0xffffffff) | (sum >>> 23));
+  sum = (C + (A ^ (B & (D ^ A))) + X[7] + 0x676f02d9) & 0xffffffff;
+  C = D + (((sum << 14) & 0xffffffff) | (sum >>> 18));
+  sum = (B + (D ^ (A & (C ^ D))) + X[12] + 0x8d2a4c8a) & 0xffffffff;
+  B = C + (((sum << 20) & 0xffffffff) | (sum >>> 12));
+  sum = (A + (B ^ C ^ D) + X[5] + 0xfffa3942) & 0xffffffff;
+  A = B + (((sum << 4) & 0xffffffff) | (sum >>> 28));
+  sum = (D + (A ^ B ^ C) + X[8] + 0x8771f681) & 0xffffffff;
+  D = A + (((sum << 11) & 0xffffffff) | (sum >>> 21));
+  sum = (C + (D ^ A ^ B) + X[11] + 0x6d9d6122) & 0xffffffff;
+  C = D + (((sum << 16) & 0xffffffff) | (sum >>> 16));
+  sum = (B + (C ^ D ^ A) + X[14] + 0xfde5380c) & 0xffffffff;
+  B = C + (((sum << 23) & 0xffffffff) | (sum >>> 9));
+  sum = (A + (B ^ C ^ D) + X[1] + 0xa4beea44) & 0xffffffff;
+  A = B + (((sum << 4) & 0xffffffff) | (sum >>> 28));
+  sum = (D + (A ^ B ^ C) + X[4] + 0x4bdecfa9) & 0xffffffff;
+  D = A + (((sum << 11) & 0xffffffff) | (sum >>> 21));
+  sum = (C + (D ^ A ^ B) + X[7] + 0xf6bb4b60) & 0xffffffff;
+  C = D + (((sum << 16) & 0xffffffff) | (sum >>> 16));
+  sum = (B + (C ^ D ^ A) + X[10] + 0xbebfbc70) & 0xffffffff;
+  B = C + (((sum << 23) & 0xffffffff) | (sum >>> 9));
+  sum = (A + (B ^ C ^ D) + X[13] + 0x289b7ec6) & 0xffffffff;
+  A = B + (((sum << 4) & 0xffffffff) | (sum >>> 28));
+  sum = (D + (A ^ B ^ C) + X[0] + 0xeaa127fa) & 0xffffffff;
+  D = A + (((sum << 11) & 0xffffffff) | (sum >>> 21));
+  sum = (C + (D ^ A ^ B) + X[3] + 0xd4ef3085) & 0xffffffff;
+  C = D + (((sum << 16) & 0xffffffff) | (sum >>> 16));
+  sum = (B + (C ^ D ^ A) + X[6] + 0x04881d05) & 0xffffffff;
+  B = C + (((sum << 23) & 0xffffffff) | (sum >>> 9));
+  sum = (A + (B ^ C ^ D) + X[9] + 0xd9d4d039) & 0xffffffff;
+  A = B + (((sum << 4) & 0xffffffff) | (sum >>> 28));
+  sum = (D + (A ^ B ^ C) + X[12] + 0xe6db99e5) & 0xffffffff;
+  D = A + (((sum << 11) & 0xffffffff) | (sum >>> 21));
+  sum = (C + (D ^ A ^ B) + X[15] + 0x1fa27cf8) & 0xffffffff;
+  C = D + (((sum << 16) & 0xffffffff) | (sum >>> 16));
+  sum = (B + (C ^ D ^ A) + X[2] + 0xc4ac5665) & 0xffffffff;
+  B = C + (((sum << 23) & 0xffffffff) | (sum >>> 9));
+  sum = (A + (C ^ (B | (~D))) + X[0] + 0xf4292244) & 0xffffffff;
+  A = B + (((sum << 6) & 0xffffffff) | (sum >>> 26));
+  sum = (D + (B ^ (A | (~C))) + X[7] + 0x432aff97) & 0xffffffff;
+  D = A + (((sum << 10) & 0xffffffff) | (sum >>> 22));
+  sum = (C + (A ^ (D | (~B))) + X[14] + 0xab9423a7) & 0xffffffff;
+  C = D + (((sum << 15) & 0xffffffff) | (sum >>> 17));
+  sum = (B + (D ^ (C | (~A))) + X[5] + 0xfc93a039) & 0xffffffff;
+  B = C + (((sum << 21) & 0xffffffff) | (sum >>> 11));
+  sum = (A + (C ^ (B | (~D))) + X[12] + 0x655b59c3) & 0xffffffff;
+  A = B + (((sum << 6) & 0xffffffff) | (sum >>> 26));
+  sum = (D + (B ^ (A | (~C))) + X[3] + 0x8f0ccc92) & 0xffffffff;
+  D = A + (((sum << 10) & 0xffffffff) | (sum >>> 22));
+  sum = (C + (A ^ (D | (~B))) + X[10] + 0xffeff47d) & 0xffffffff;
+  C = D + (((sum << 15) & 0xffffffff) | (sum >>> 17));
+  sum = (B + (D ^ (C | (~A))) + X[1] + 0x85845dd1) & 0xffffffff;
+  B = C + (((sum << 21) & 0xffffffff) | (sum >>> 11));
+  sum = (A + (C ^ (B | (~D))) + X[8] + 0x6fa87e4f) & 0xffffffff;
+  A = B + (((sum << 6) & 0xffffffff) | (sum >>> 26));
+  sum = (D + (B ^ (A | (~C))) + X[15] + 0xfe2ce6e0) & 0xffffffff;
+  D = A + (((sum << 10) & 0xffffffff) | (sum >>> 22));
+  sum = (C + (A ^ (D | (~B))) + X[6] + 0xa3014314) & 0xffffffff;
+  C = D + (((sum << 15) & 0xffffffff) | (sum >>> 17));
+  sum = (B + (D ^ (C | (~A))) + X[13] + 0x4e0811a1) & 0xffffffff;
+  B = C + (((sum << 21) & 0xffffffff) | (sum >>> 11));
+  sum = (A + (C ^ (B | (~D))) + X[4] + 0xf7537e82) & 0xffffffff;
+  A = B + (((sum << 6) & 0xffffffff) | (sum >>> 26));
+  sum = (D + (B ^ (A | (~C))) + X[11] + 0xbd3af235) & 0xffffffff;
+  D = A + (((sum << 10) & 0xffffffff) | (sum >>> 22));
+  sum = (C + (A ^ (D | (~B))) + X[2] + 0x2ad7d2bb) & 0xffffffff;
+  C = D + (((sum << 15) & 0xffffffff) | (sum >>> 17));
+  sum = (B + (D ^ (C | (~A))) + X[9] + 0xeb86d391) & 0xffffffff;
+  B = C + (((sum << 21) & 0xffffffff) | (sum >>> 11));
+
+  this.chain_[0] = (this.chain_[0] + A) & 0xffffffff;
+  this.chain_[1] = (this.chain_[1] + B) & 0xffffffff;
+  this.chain_[2] = (this.chain_[2] + C) & 0xffffffff;
+  this.chain_[3] = (this.chain_[3] + D) & 0xffffffff;
+};
+
+
+/** @override */
+goog.crypt.Md5.prototype.update = function(bytes, opt_length) {
+  if (!goog.isDef(opt_length)) {
+    opt_length = bytes.length;
+  }
+  var lengthMinusBlock = opt_length - this.blockSize;
+
+  // Copy some object properties to local variables in order to save on access
+  // time from inside the loop (~10% speedup was observed on Chrome 11).
+  var block = this.block_;
+  var blockLength = this.blockLength_;
+  var i = 0;
+
+  // The outer while loop should execute at most twice.
+  while (i < opt_length) {
+    // When we have no data in the block to top up, we can directly process the
+    // input buffer (assuming it contains sufficient data). This gives ~30%
+    // speedup on Chrome 14 and ~70% speedup on Firefox 6.0, but requires that
+    // the data is provided in large chunks (or in multiples of 64 bytes).
+    if (blockLength == 0) {
+      while (i <= lengthMinusBlock) {
+        this.compress_(bytes, i);
+        i += this.blockSize;
+      }
+    }
+
+    if (goog.isString(bytes)) {
+      while (i < opt_length) {
+        block[blockLength++] = bytes.charCodeAt(i++);
+        if (blockLength == this.blockSize) {
+          this.compress_(block);
+          blockLength = 0;
+          // Jump to the outer loop so we use the full-block optimization.
+          break;
+        }
+      }
+    } else {
+      while (i < opt_length) {
+        block[blockLength++] = bytes[i++];
+        if (blockLength == this.blockSize) {
+          this.compress_(block);
+          blockLength = 0;
+          // Jump to the outer loop so we use the full-block optimization.
+          break;
+        }
+      }
+    }
+  }
+
+  this.blockLength_ = blockLength;
+  this.totalLength_ += opt_length;
+};
+
+
+/** @override */
+goog.crypt.Md5.prototype.digest = function() {
+  // This must accommodate at least 1 padding byte (0x80), 8 bytes of
+  // total bitlength, and must end at a 64-byte boundary.
+  var pad = new Array((this.blockLength_ < 56 ?
+                       this.blockSize :
+                       this.blockSize * 2) - this.blockLength_);
+
+  // Add padding: 0x80 0x00*
+  pad[0] = 0x80;
+  for (var i = 1; i < pad.length - 8; ++i) {
+    pad[i] = 0;
+  }
+  // Add the total number of bits, little endian 64-bit integer.
+  var totalBits = this.totalLength_ * 8;
+  for (var i = pad.length - 8; i < pad.length; ++i) {
+    pad[i] = totalBits & 0xff;
+    totalBits /= 0x100; // Don't use bit-shifting here!
+  }
+  this.update(pad);
+
+  var digest = new Array(16);
+  var n = 0;
+  for (var i = 0; i < 4; ++i) {
+    for (var j = 0; j < 32; j += 8) {
+      digest[n++] = (this.chain_[i] >>> j) & 0xff;
+    }
+  }
+  return digest;
+};
+
+goog.provide('ol.style.Stroke');
+
+goog.require('goog.crypt');
+goog.require('goog.crypt.Md5');
+goog.require('ol.color');
+goog.require('ol.structs.IHasChecksum');
+
+
+
+/**
+ * @classdesc
+ * Set stroke style for vector features.
+ * Note that the defaults given are the Canvas defaults, which will be used if
+ * option is not defined. The `get` functions return whatever was entered in
+ * the options; they will not return the default.
+ *
+ * @constructor
+ * @param {olx.style.StrokeOptions=} opt_options Options.
+ * @implements {ol.structs.IHasChecksum}
+ * @api
+ */
+ol.style.Stroke = function(opt_options) {
+
+  var options = opt_options || {};
+
+  /**
+   * @private
+   * @type {ol.Color|string}
+   */
+  this.color_ = options.color !== undefined ? options.color : null;
+
+  /**
+   * @private
+   * @type {string|undefined}
+   */
+  this.lineCap_ = options.lineCap;
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.lineDash_ = options.lineDash !== undefined ? options.lineDash : null;
+
+  /**
+   * @private
+   * @type {string|undefined}
+   */
+  this.lineJoin_ = options.lineJoin;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.miterLimit_ = options.miterLimit;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.width_ = options.width;
+
+  /**
+   * @private
+   * @type {string|undefined}
+   */
+  this.checksum_ = undefined;
+};
+
+
+/**
+ * Get the stroke color.
+ * @return {ol.Color|string} Color.
+ * @api
+ */
+ol.style.Stroke.prototype.getColor = function() {
+  return this.color_;
+};
+
+
+/**
+ * Get the line cap type for the stroke.
+ * @return {string|undefined} Line cap.
+ * @api
+ */
+ol.style.Stroke.prototype.getLineCap = function() {
+  return this.lineCap_;
+};
+
+
+/**
+ * Get the line dash style for the stroke.
+ * @return {Array.<number>} Line dash.
+ * @api
+ */
+ol.style.Stroke.prototype.getLineDash = function() {
+  return this.lineDash_;
+};
+
+
+/**
+ * Get the line join type for the stroke.
+ * @return {string|undefined} Line join.
+ * @api
+ */
+ol.style.Stroke.prototype.getLineJoin = function() {
+  return this.lineJoin_;
+};
+
+
+/**
+ * Get the miter limit for the stroke.
+ * @return {number|undefined} Miter limit.
+ * @api
+ */
+ol.style.Stroke.prototype.getMiterLimit = function() {
+  return this.miterLimit_;
+};
+
+
+/**
+ * Get the stroke width.
+ * @return {number|undefined} Width.
+ * @api
+ */
+ol.style.Stroke.prototype.getWidth = function() {
+  return this.width_;
+};
+
+
+/**
+ * Set the color.
+ *
+ * @param {ol.Color|string} color Color.
+ * @api
+ */
+ol.style.Stroke.prototype.setColor = function(color) {
+  this.color_ = color;
+  this.checksum_ = undefined;
+};
+
+
+/**
+ * Set the line cap.
+ *
+ * @param {string|undefined} lineCap Line cap.
+ * @api
+ */
+ol.style.Stroke.prototype.setLineCap = function(lineCap) {
+  this.lineCap_ = lineCap;
+  this.checksum_ = undefined;
+};
+
+
+/**
+ * Set the line dash.
+ *
+ * @param {Array.<number>} lineDash Line dash.
+ * @api
+ */
+ol.style.Stroke.prototype.setLineDash = function(lineDash) {
+  this.lineDash_ = lineDash;
+  this.checksum_ = undefined;
+};
+
+
+/**
+ * Set the line join.
+ *
+ * @param {string|undefined} lineJoin Line join.
+ * @api
+ */
+ol.style.Stroke.prototype.setLineJoin = function(lineJoin) {
+  this.lineJoin_ = lineJoin;
+  this.checksum_ = undefined;
+};
+
+
+/**
+ * Set the miter limit.
+ *
+ * @param {number|undefined} miterLimit Miter limit.
+ * @api
+ */
+ol.style.Stroke.prototype.setMiterLimit = function(miterLimit) {
+  this.miterLimit_ = miterLimit;
+  this.checksum_ = undefined;
+};
+
+
+/**
+ * Set the width.
+ *
+ * @param {number|undefined} width Width.
+ * @api
+ */
+ol.style.Stroke.prototype.setWidth = function(width) {
+  this.width_ = width;
+  this.checksum_ = undefined;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Stroke.prototype.getChecksum = function() {
+  if (this.checksum_ === undefined) {
+    var raw = 's' +
+        (this.color_ ?
+            ol.color.asString(this.color_) : '-') + ',' +
+        (this.lineCap_ !== undefined ?
+            this.lineCap_.toString() : '-') + ',' +
+        (this.lineDash_ ?
+            this.lineDash_.toString() : '-') + ',' +
+        (this.lineJoin_ !== undefined ?
+            this.lineJoin_ : '-') + ',' +
+        (this.miterLimit_ !== undefined ?
+            this.miterLimit_.toString() : '-') + ',' +
+        (this.width_ !== undefined ?
+            this.width_.toString() : '-');
+
+    var md5 = new goog.crypt.Md5();
+    md5.update(raw);
+    this.checksum_ = goog.crypt.byteArrayToString(md5.digest());
+  }
+
+  return this.checksum_;
+};
+
+goog.provide('ol.style.Circle');
+
+goog.require('goog.asserts');
+goog.require('ol');
+goog.require('ol.color');
+goog.require('ol.has');
+goog.require('ol.render.canvas');
+goog.require('ol.structs.IHasChecksum');
+goog.require('ol.style.Fill');
+goog.require('ol.style.Image');
+goog.require('ol.style.ImageState');
+goog.require('ol.style.Stroke');
+
+
+
+/**
+ * @classdesc
+ * Set circle style for vector features.
+ *
+ * @constructor
+ * @param {olx.style.CircleOptions=} opt_options Options.
+ * @extends {ol.style.Image}
+ * @implements {ol.structs.IHasChecksum}
+ * @api
+ */
+ol.style.Circle = function(opt_options) {
+
+  var options = opt_options || {};
+
+  /**
+   * @private
+   * @type {Array.<string>}
+   */
+  this.checksums_ = null;
+
+  /**
+   * @private
+   * @type {HTMLCanvasElement}
+   */
+  this.canvas_ = null;
+
+  /**
+   * @private
+   * @type {HTMLCanvasElement}
+   */
+  this.hitDetectionCanvas_ = null;
+
+  /**
+   * @private
+   * @type {ol.style.Fill}
+   */
+  this.fill_ = options.fill !== undefined ? options.fill : null;
+
+  /**
+   * @private
+   * @type {ol.style.Stroke}
+   */
+  this.stroke_ = options.stroke !== undefined ? options.stroke : null;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.radius_ = options.radius;
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.origin_ = [0, 0];
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.anchor_ = null;
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.size_ = null;
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.imageSize_ = null;
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.hitDetectionImageSize_ = null;
+
+  this.render_(options.atlasManager);
+
+  /**
+   * @type {boolean}
+   */
+  var snapToPixel = options.snapToPixel !== undefined ?
+      options.snapToPixel : true;
+
+  goog.base(this, {
+    opacity: 1,
+    rotateWithView: false,
+    rotation: 0,
+    scale: 1,
+    snapToPixel: snapToPixel
+  });
+
+};
+goog.inherits(ol.style.Circle, ol.style.Image);
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Circle.prototype.getAnchor = function() {
+  return this.anchor_;
+};
+
+
+/**
+ * Get the fill style for the circle.
+ * @return {ol.style.Fill} Fill style.
+ * @api
+ */
+ol.style.Circle.prototype.getFill = function() {
+  return this.fill_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Circle.prototype.getHitDetectionImage = function(pixelRatio) {
+  return this.hitDetectionCanvas_;
+};
+
+
+/**
+ * Get the image used to render the circle.
+ * @param {number} pixelRatio Pixel ratio.
+ * @return {HTMLCanvasElement} Canvas element.
+ * @api
+ */
+ol.style.Circle.prototype.getImage = function(pixelRatio) {
+  return this.canvas_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Circle.prototype.getImageState = function() {
+  return ol.style.ImageState.LOADED;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Circle.prototype.getImageSize = function() {
+  return this.imageSize_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Circle.prototype.getHitDetectionImageSize = function() {
+  return this.hitDetectionImageSize_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Circle.prototype.getOrigin = function() {
+  return this.origin_;
+};
+
+
+/**
+ * Get the circle radius.
+ * @return {number} Radius.
+ * @api
+ */
+ol.style.Circle.prototype.getRadius = function() {
+  return this.radius_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Circle.prototype.getSize = function() {
+  return this.size_;
+};
+
+
+/**
+ * Get the stroke style for the circle.
+ * @return {ol.style.Stroke} Stroke style.
+ * @api
+ */
+ol.style.Circle.prototype.getStroke = function() {
+  return this.stroke_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Circle.prototype.listenImageChange = ol.nullFunction;
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Circle.prototype.load = ol.nullFunction;
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Circle.prototype.unlistenImageChange = ol.nullFunction;
+
+
+/**
+ * @typedef {{strokeStyle: (string|undefined), strokeWidth: number,
+ *   size: number, lineDash: Array.<number>}}
+ */
+ol.style.Circle.RenderOptions;
+
+
+/**
+ * @private
+ * @param {ol.style.AtlasManager|undefined} atlasManager
+ */
+ol.style.Circle.prototype.render_ = function(atlasManager) {
+  var imageSize;
+  var lineDash = null;
+  var strokeStyle;
+  var strokeWidth = 0;
+
+  if (this.stroke_) {
+    strokeStyle = ol.color.asString(this.stroke_.getColor());
+    strokeWidth = this.stroke_.getWidth();
+    if (strokeWidth === undefined) {
+      strokeWidth = ol.render.canvas.defaultLineWidth;
+    }
+    lineDash = this.stroke_.getLineDash();
+    if (!ol.has.CANVAS_LINE_DASH) {
+      lineDash = null;
+    }
+  }
+
+
+  var size = 2 * (this.radius_ + strokeWidth) + 1;
+
+  /** @type {ol.style.Circle.RenderOptions} */
+  var renderOptions = {
+    strokeStyle: strokeStyle,
+    strokeWidth: strokeWidth,
+    size: size,
+    lineDash: lineDash
+  };
+
+  if (atlasManager === undefined) {
+    // no atlas manager is used, create a new canvas
+    this.canvas_ = /** @type {HTMLCanvasElement} */
+        (document.createElement('CANVAS'));
+    this.canvas_.height = size;
+    this.canvas_.width = size;
+
+    // canvas.width and height are rounded to the closest integer
+    size = this.canvas_.width;
+    imageSize = size;
+
+    // draw the circle on the canvas
+    var context = /** @type {CanvasRenderingContext2D} */
+        (this.canvas_.getContext('2d'));
+    this.draw_(renderOptions, context, 0, 0);
+
+    this.createHitDetectionCanvas_(renderOptions);
+  } else {
+    // an atlas manager is used, add the symbol to an atlas
+    size = Math.round(size);
+
+    var hasCustomHitDetectionImage = !this.fill_;
+    var renderHitDetectionCallback;
+    if (hasCustomHitDetectionImage) {
+      // render the hit-detection image into a separate atlas image
+      renderHitDetectionCallback =
+          goog.bind(this.drawHitDetectionCanvas_, this, renderOptions);
+    }
+
+    var id = this.getChecksum();
+    var info = atlasManager.add(
+        id, size, size, goog.bind(this.draw_, this, renderOptions),
+        renderHitDetectionCallback);
+    goog.asserts.assert(info, 'circle radius is too large');
+
+    this.canvas_ = info.image;
+    this.origin_ = [info.offsetX, info.offsetY];
+    imageSize = info.image.width;
+
+    if (hasCustomHitDetectionImage) {
+      this.hitDetectionCanvas_ = info.hitImage;
+      this.hitDetectionImageSize_ =
+          [info.hitImage.width, info.hitImage.height];
+    } else {
+      this.hitDetectionCanvas_ = this.canvas_;
+      this.hitDetectionImageSize_ = [imageSize, imageSize];
+    }
+  }
+
+  this.anchor_ = [size / 2, size / 2];
+  this.size_ = [size, size];
+  this.imageSize_ = [imageSize, imageSize];
+};
+
+
+/**
+ * @private
+ * @param {ol.style.Circle.RenderOptions} renderOptions
+ * @param {CanvasRenderingContext2D} context
+ * @param {number} x The origin for the symbol (x).
+ * @param {number} y The origin for the symbol (y).
+ */
+ol.style.Circle.prototype.draw_ = function(renderOptions, context, x, y) {
+  // reset transform
+  context.setTransform(1, 0, 0, 1, 0, 0);
+
+  // then move to (x, y)
+  context.translate(x, y);
+
+  context.beginPath();
+  context.arc(
+      renderOptions.size / 2, renderOptions.size / 2,
+      this.radius_, 0, 2 * Math.PI, true);
+
+  if (this.fill_) {
+    context.fillStyle = ol.color.asString(this.fill_.getColor());
+    context.fill();
+  }
+  if (this.stroke_) {
+    context.strokeStyle = renderOptions.strokeStyle;
+    context.lineWidth = renderOptions.strokeWidth;
+    if (renderOptions.lineDash) {
+      context.setLineDash(renderOptions.lineDash);
+    }
+    context.stroke();
+  }
+  context.closePath();
+};
+
+
+/**
+ * @private
+ * @param {ol.style.Circle.RenderOptions} renderOptions
+ */
+ol.style.Circle.prototype.createHitDetectionCanvas_ = function(renderOptions) {
+  this.hitDetectionImageSize_ = [renderOptions.size, renderOptions.size];
+  if (this.fill_) {
+    this.hitDetectionCanvas_ = this.canvas_;
+    return;
+  }
+
+  // if no fill style is set, create an extra hit-detection image with a
+  // default fill style
+  this.hitDetectionCanvas_ = /** @type {HTMLCanvasElement} */
+      (document.createElement('CANVAS'));
+  var canvas = this.hitDetectionCanvas_;
+
+  canvas.height = renderOptions.size;
+  canvas.width = renderOptions.size;
+
+  var context = /** @type {CanvasRenderingContext2D} */
+      (canvas.getContext('2d'));
+  this.drawHitDetectionCanvas_(renderOptions, context, 0, 0);
+};
+
+
+/**
+ * @private
+ * @param {ol.style.Circle.RenderOptions} renderOptions
+ * @param {CanvasRenderingContext2D} context
+ * @param {number} x The origin for the symbol (x).
+ * @param {number} y The origin for the symbol (y).
+ */
+ol.style.Circle.prototype.drawHitDetectionCanvas_ =
+    function(renderOptions, context, x, y) {
+  // reset transform
+  context.setTransform(1, 0, 0, 1, 0, 0);
+
+  // then move to (x, y)
+  context.translate(x, y);
+
+  context.beginPath();
+  context.arc(
+      renderOptions.size / 2, renderOptions.size / 2,
+      this.radius_, 0, 2 * Math.PI, true);
+
+  context.fillStyle = ol.color.asString(ol.render.canvas.defaultFillStyle);
+  context.fill();
+  if (this.stroke_) {
+    context.strokeStyle = renderOptions.strokeStyle;
+    context.lineWidth = renderOptions.strokeWidth;
+    if (renderOptions.lineDash) {
+      context.setLineDash(renderOptions.lineDash);
+    }
+    context.stroke();
+  }
+  context.closePath();
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Circle.prototype.getChecksum = function() {
+  var strokeChecksum = this.stroke_ ?
+      this.stroke_.getChecksum() : '-';
+  var fillChecksum = this.fill_ ?
+      this.fill_.getChecksum() : '-';
+
+  var recalculate = !this.checksums_ ||
+      (strokeChecksum != this.checksums_[1] ||
+      fillChecksum != this.checksums_[2] ||
+      this.radius_ != this.checksums_[3]);
+
+  if (recalculate) {
+    var checksum = 'c' + strokeChecksum + fillChecksum +
+        (this.radius_ !== undefined ? this.radius_.toString() : '-');
+    this.checksums_ = [checksum, strokeChecksum, fillChecksum, this.radius_];
+  }
+
+  return this.checksums_[0];
+};
+
+goog.provide('ol.style.GeometryFunction');
+goog.provide('ol.style.Style');
+goog.provide('ol.style.StyleFunction');
+goog.provide('ol.style.defaultGeometryFunction');
+
+goog.require('goog.asserts');
+goog.require('ol.geom.Geometry');
+goog.require('ol.geom.GeometryType');
+goog.require('ol.style.Circle');
+goog.require('ol.style.Fill');
+goog.require('ol.style.Image');
+goog.require('ol.style.Stroke');
+
+
+
+/**
+ * @classdesc
+ * Container for vector feature rendering styles. Any changes made to the style
+ * or its children through `set*()` methods will not take effect until the
+ * feature or layer that uses the style is re-rendered.
+ *
+ * @constructor
+ * @param {olx.style.StyleOptions=} opt_options Style options.
+ * @api
+ */
+ol.style.Style = function(opt_options) {
+
+  var options = opt_options || {};
+
+  /**
+   * @private
+   * @type {string|ol.geom.Geometry|ol.style.GeometryFunction}
+   */
+  this.geometry_ = null;
+
+  /**
+   * @private
+   * @type {!ol.style.GeometryFunction}
+   */
+  this.geometryFunction_ = ol.style.defaultGeometryFunction;
+
+  if (options.geometry !== undefined) {
+    this.setGeometry(options.geometry);
+  }
+
+  /**
+   * @private
+   * @type {ol.style.Fill}
+   */
+  this.fill_ = options.fill !== undefined ? options.fill : null;
+
+  /**
+   * @private
+   * @type {ol.style.Image}
+   */
+  this.image_ = options.image !== undefined ? options.image : null;
+
+  /**
+   * @private
+   * @type {ol.style.Stroke}
+   */
+  this.stroke_ = options.stroke !== undefined ? options.stroke : null;
+
+  /**
+   * @private
+   * @type {ol.style.Text}
+   */
+  this.text_ = options.text !== undefined ? options.text : null;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.zIndex_ = options.zIndex;
+
+};
+
+
+/**
+ * Get the geometry to be rendered.
+ * @return {string|ol.geom.Geometry|ol.style.GeometryFunction}
+ * Feature property or geometry or function that returns the geometry that will
+ * be rendered with this style.
+ * @api
+ */
+ol.style.Style.prototype.getGeometry = function() {
+  return this.geometry_;
+};
+
+
+/**
+ * Get the function used to generate a geometry for rendering.
+ * @return {!ol.style.GeometryFunction} Function that is called with a feature
+ * and returns the geometry to render instead of the feature's geometry.
+ * @api
+ */
+ol.style.Style.prototype.getGeometryFunction = function() {
+  return this.geometryFunction_;
+};
+
+
+/**
+ * Get the fill style.
+ * @return {ol.style.Fill} Fill style.
+ * @api
+ */
+ol.style.Style.prototype.getFill = function() {
+  return this.fill_;
+};
+
+
+/**
+ * Get the image style.
+ * @return {ol.style.Image} Image style.
+ * @api
+ */
+ol.style.Style.prototype.getImage = function() {
+  return this.image_;
+};
+
+
+/**
+ * Get the stroke style.
+ * @return {ol.style.Stroke} Stroke style.
+ * @api
+ */
+ol.style.Style.prototype.getStroke = function() {
+  return this.stroke_;
+};
+
+
+/**
+ * Get the text style.
+ * @return {ol.style.Text} Text style.
+ * @api
+ */
+ol.style.Style.prototype.getText = function() {
+  return this.text_;
+};
+
+
+/**
+ * Get the z-index for the style.
+ * @return {number|undefined} ZIndex.
+ * @api
+ */
+ol.style.Style.prototype.getZIndex = function() {
+  return this.zIndex_;
+};
+
+
+/**
+ * Set a geometry that is rendered instead of the feature's geometry.
+ *
+ * @param {string|ol.geom.Geometry|ol.style.GeometryFunction} geometry
+ *     Feature property or geometry or function returning a geometry to render
+ *     for this style.
+ * @api
+ */
+ol.style.Style.prototype.setGeometry = function(geometry) {
+  if (goog.isFunction(geometry)) {
+    this.geometryFunction_ = geometry;
+  } else if (goog.isString(geometry)) {
+    this.geometryFunction_ = function(feature) {
+      var result = feature.get(geometry);
+      if (result) {
+        goog.asserts.assertInstanceof(result, ol.geom.Geometry,
+            'feature geometry must be an ol.geom.Geometry instance');
+      }
+      return result;
+    };
+  } else if (!geometry) {
+    this.geometryFunction_ = ol.style.defaultGeometryFunction;
+  } else if (geometry !== undefined) {
+    goog.asserts.assertInstanceof(geometry, ol.geom.Geometry,
+        'geometry must be an ol.geom.Geometry instance');
+    this.geometryFunction_ = function() {
+      return geometry;
+    };
+  }
+  this.geometry_ = geometry;
+};
+
+
+/**
+ * Set the z-index.
+ *
+ * @param {number|undefined} zIndex ZIndex.
+ * @api
+ */
+ol.style.Style.prototype.setZIndex = function(zIndex) {
+  this.zIndex_ = zIndex;
+};
+
+
+/**
+ * A function that takes an {@link ol.Feature} and a `{number}` representing
+ * the view's resolution. The function should return an array of
+ * {@link ol.style.Style}. This way e.g. a vector layer can be styled.
+ *
+ * @typedef {function((ol.Feature|ol.render.Feature), number):
+ *     (ol.style.Style|Array.<ol.style.Style>)}
+ * @api
+ */
+ol.style.StyleFunction;
+
+
+/**
+ * Convert the provided object into a style function.  Functions passed through
+ * unchanged.  Arrays of ol.style.Style or single style objects wrapped in a
+ * new style function.
+ * @param {ol.style.StyleFunction|Array.<ol.style.Style>|ol.style.Style} obj
+ *     A style function, a single style, or an array of styles.
+ * @return {ol.style.StyleFunction} A style function.
+ */
+ol.style.createStyleFunction = function(obj) {
+  var styleFunction;
+
+  if (goog.isFunction(obj)) {
+    styleFunction = obj;
+  } else {
+    /**
+     * @type {Array.<ol.style.Style>}
+     */
+    var styles;
+    if (goog.isArray(obj)) {
+      styles = obj;
+    } else {
+      goog.asserts.assertInstanceof(obj, ol.style.Style,
+          'obj geometry must be an ol.style.Style instance');
+      styles = [obj];
+    }
+    styleFunction = function() {
+      return styles;
+    };
+  }
+  return styleFunction;
+};
+
+
+/**
+ * @type {Array.<ol.style.Style>}
+ * @private
+ */
+ol.style.defaultStyle_ = null;
+
+
+/**
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ * @param {number} resolution Resolution.
+ * @return {Array.<ol.style.Style>} Style.
+ */
+ol.style.defaultStyleFunction = function(feature, resolution) {
+  // We don't use an immediately-invoked function
+  // and a closure so we don't get an error at script evaluation time in
+  // browsers that do not support Canvas. (ol.style.Circle does
+  // canvas.getContext('2d') at construction time, which will cause an.error
+  // in such browsers.)
+  if (!ol.style.defaultStyle_) {
+    var fill = new ol.style.Fill({
+      color: 'rgba(255,255,255,0.4)'
+    });
+    var stroke = new ol.style.Stroke({
+      color: '#3399CC',
+      width: 1.25
+    });
+    ol.style.defaultStyle_ = [
+      new ol.style.Style({
+        image: new ol.style.Circle({
+          fill: fill,
+          stroke: stroke,
+          radius: 5
+        }),
+        fill: fill,
+        stroke: stroke
+      })
+    ];
+  }
+  return ol.style.defaultStyle_;
+};
+
+
+/**
+ * Default styles for editing features.
+ * @return {Object.<ol.geom.GeometryType, Array.<ol.style.Style>>} Styles
+ */
+ol.style.createDefaultEditingStyles = function() {
+  /** @type {Object.<ol.geom.GeometryType, Array.<ol.style.Style>>} */
+  var styles = {};
+  var white = [255, 255, 255, 1];
+  var blue = [0, 153, 255, 1];
+  var width = 3;
+  styles[ol.geom.GeometryType.POLYGON] = [
+    new ol.style.Style({
+      fill: new ol.style.Fill({
+        color: [255, 255, 255, 0.5]
+      })
+    })
+  ];
+  styles[ol.geom.GeometryType.MULTI_POLYGON] =
+      styles[ol.geom.GeometryType.POLYGON];
+
+  styles[ol.geom.GeometryType.LINE_STRING] = [
+    new ol.style.Style({
+      stroke: new ol.style.Stroke({
+        color: white,
+        width: width + 2
+      })
+    }),
+    new ol.style.Style({
+      stroke: new ol.style.Stroke({
+        color: blue,
+        width: width
+      })
+    })
+  ];
+  styles[ol.geom.GeometryType.MULTI_LINE_STRING] =
+      styles[ol.geom.GeometryType.LINE_STRING];
+
+  styles[ol.geom.GeometryType.CIRCLE] =
+      styles[ol.geom.GeometryType.POLYGON].concat(
+          styles[ol.geom.GeometryType.LINE_STRING]
+      );
+
+
+  styles[ol.geom.GeometryType.POINT] = [
+    new ol.style.Style({
+      image: new ol.style.Circle({
+        radius: width * 2,
+        fill: new ol.style.Fill({
+          color: blue
+        }),
+        stroke: new ol.style.Stroke({
+          color: white,
+          width: width / 2
+        })
+      }),
+      zIndex: Infinity
+    })
+  ];
+  styles[ol.geom.GeometryType.MULTI_POINT] =
+      styles[ol.geom.GeometryType.POINT];
+
+  styles[ol.geom.GeometryType.GEOMETRY_COLLECTION] =
+      styles[ol.geom.GeometryType.POLYGON].concat(
+          styles[ol.geom.GeometryType.LINE_STRING],
+          styles[ol.geom.GeometryType.POINT]
+      );
+
+  return styles;
+};
+
+
+/**
+ * A function that takes an {@link ol.Feature} as argument and returns an
+ * {@link ol.geom.Geometry} that will be rendered and styled for the feature.
+ *
+ * @typedef {function((ol.Feature|ol.render.Feature)):
+ *     (ol.geom.Geometry|ol.render.Feature|undefined)}
+ * @api
+ */
+ol.style.GeometryFunction;
+
+
+/**
+ * Function that is called with a feature and returns its default geometry.
+ * @param {ol.Feature|ol.render.Feature} feature Feature to get the geometry
+ *     for.
+ * @return {ol.geom.Geometry|ol.render.Feature|undefined} Geometry to render.
+ */
+ol.style.defaultGeometryFunction = function(feature) {
+  goog.asserts.assert(feature, 'feature must not be null');
+  return feature.getGeometry();
+};
+
+goog.provide('ol.layer.Vector');
+
+goog.require('goog.asserts');
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.layer.Layer');
+goog.require('ol.style.Style');
+
+
+/**
+ * @enum {string}
+ */
+ol.layer.VectorProperty = {
+  RENDER_ORDER: 'renderOrder'
+};
+
+
+
+/**
+ * @classdesc
+ * Vector data that is rendered client-side.
+ * Note that any property set in the options is set as a {@link ol.Object}
+ * property on the layer object; for example, setting `title: 'My Title'` in the
+ * options means that `title` is observable, and has get/set accessors.
+ *
+ * @constructor
+ * @extends {ol.layer.Layer}
+ * @fires ol.render.Event
+ * @param {olx.layer.VectorOptions=} opt_options Options.
+ * @api stable
+ */
+ol.layer.Vector = function(opt_options) {
+
+  var options = opt_options ?
+      opt_options : /** @type {olx.layer.VectorOptions} */ ({});
+
+  goog.asserts.assert(
+      options.renderOrder === undefined || !options.renderOrder ||
+      goog.isFunction(options.renderOrder),
+      'renderOrder must be a comparator function');
+
+  var baseOptions = goog.object.clone(options);
+
+  delete baseOptions.style;
+  delete baseOptions.renderBuffer;
+  delete baseOptions.updateWhileAnimating;
+  delete baseOptions.updateWhileInteracting;
+  goog.base(this, /** @type {olx.layer.LayerOptions} */ (baseOptions));
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.renderBuffer_ = options.renderBuffer !== undefined ?
+      options.renderBuffer : 100;
+
+  /**
+   * User provided style.
+   * @type {ol.style.Style|Array.<ol.style.Style>|ol.style.StyleFunction}
+   * @private
+   */
+  this.style_ = null;
+
+  /**
+   * Style function for use within the library.
+   * @type {ol.style.StyleFunction|undefined}
+   * @private
+   */
+  this.styleFunction_ = undefined;
+
+  this.setStyle(options.style);
+
+  /**
+   * @type {boolean}
+   * @private
+   */
+  this.updateWhileAnimating_ = options.updateWhileAnimating !== undefined ?
+      options.updateWhileAnimating : false;
+
+  /**
+   * @type {boolean}
+   * @private
+   */
+  this.updateWhileInteracting_ = options.updateWhileInteracting !== undefined ?
+      options.updateWhileInteracting : false;
+
+};
+goog.inherits(ol.layer.Vector, ol.layer.Layer);
+
+
+/**
+ * @return {number|undefined} Render buffer.
+ */
+ol.layer.Vector.prototype.getRenderBuffer = function() {
+  return this.renderBuffer_;
+};
+
+
+/**
+ * @return {function(ol.Feature, ol.Feature): number|null|undefined} Render
+ *     order.
+ */
+ol.layer.Vector.prototype.getRenderOrder = function() {
+  return /** @type {function(ol.Feature, ol.Feature):number|null|undefined} */ (
+      this.get(ol.layer.VectorProperty.RENDER_ORDER));
+};
+
+
+/**
+ * Return the associated {@link ol.source.Vector vectorsource} of the layer.
+ * @function
+ * @return {ol.source.Vector} Source.
+ * @api stable
+ */
+ol.layer.Vector.prototype.getSource;
+
+
+/**
+ * Get the style for features.  This returns whatever was passed to the `style`
+ * option at construction or to the `setStyle` method.
+ * @return {ol.style.Style|Array.<ol.style.Style>|ol.style.StyleFunction}
+ *     Layer style.
+ * @api stable
+ */
+ol.layer.Vector.prototype.getStyle = function() {
+  return this.style_;
+};
+
+
+/**
+ * Get the style function.
+ * @return {ol.style.StyleFunction|undefined} Layer style function.
+ * @api stable
+ */
+ol.layer.Vector.prototype.getStyleFunction = function() {
+  return this.styleFunction_;
+};
+
+
+/**
+ * @return {boolean} Whether the rendered layer should be updated while
+ *     animating.
+ */
+ol.layer.Vector.prototype.getUpdateWhileAnimating = function() {
+  return this.updateWhileAnimating_;
+};
+
+
+/**
+ * @return {boolean} Whether the rendered layer should be updated while
+ *     interacting.
+ */
+ol.layer.Vector.prototype.getUpdateWhileInteracting = function() {
+  return this.updateWhileInteracting_;
+};
+
+
+/**
+ * @param {function(ol.Feature, ol.Feature):number|null|undefined} renderOrder
+ *     Render order.
+ */
+ol.layer.Vector.prototype.setRenderOrder = function(renderOrder) {
+  goog.asserts.assert(
+      renderOrder === undefined || !renderOrder ||
+      goog.isFunction(renderOrder),
+      'renderOrder must be a comparator function');
+  this.set(ol.layer.VectorProperty.RENDER_ORDER, renderOrder);
+};
+
+
+/**
+ * Set the style for features.  This can be a single style object, an array
+ * of styles, or a function that takes a feature and resolution and returns
+ * an array of styles. If it is `undefined` the default style is used. If
+ * it is `null` the layer has no style (a `null` style), so only features
+ * that have their own styles will be rendered in the layer. See
+ * {@link ol.style} for information on the default style.
+ * @param {ol.style.Style|Array.<ol.style.Style>|ol.style.StyleFunction|null|undefined}
+ *     style Layer style.
+ * @api stable
+ */
+ol.layer.Vector.prototype.setStyle = function(style) {
+  this.style_ = style !== undefined ? style : ol.style.defaultStyleFunction;
+  this.styleFunction_ = style === null ?
+      undefined : ol.style.createStyleFunction(this.style_);
+  this.changed();
+};
+
+goog.provide('ol.layer.VectorTile');
+
+goog.require('goog.object');
+goog.require('ol.layer.Vector');
+
+
+/**
+ * @enum {string}
+ */
+ol.layer.VectorTileProperty = {
+  PRELOAD: 'preload',
+  USE_INTERIM_TILES_ON_ERROR: 'useInterimTilesOnError'
+};
+
+
+
+/**
+ * @classdesc
+ * Layer for vector tile data that is rendered client-side.
+ * Note that any property set in the options is set as a {@link ol.Object}
+ * property on the layer object; for example, setting `title: 'My Title'` in the
+ * options means that `title` is observable, and has get/set accessors.
+ *
+ * @constructor
+ * @extends {ol.layer.Vector}
+ * @param {olx.layer.VectorTileOptions=} opt_options Options.
+ * @api
+ */
+ol.layer.VectorTile = function(opt_options) {
+  var options = opt_options ? opt_options : {};
+
+  var baseOptions = goog.object.clone(options);
+
+  delete baseOptions.preload;
+  delete baseOptions.useInterimTilesOnError;
+  goog.base(this,  /** @type {olx.layer.VectorOptions} */ (baseOptions));
+
+  this.setPreload(options.preload ? options.preload : 0);
+  this.setUseInterimTilesOnError(options.useInterimTilesOnError ?
+      options.useInterimTilesOnError : true);
+
+};
+goog.inherits(ol.layer.VectorTile, ol.layer.Vector);
+
+
+/**
+ * Return the level as number to which we will preload tiles up to.
+ * @return {number} The level to preload tiles up to.
+ * @observable
+ * @api
+ */
+ol.layer.VectorTile.prototype.getPreload = function() {
+  return /** @type {number} */ (this.get(ol.layer.VectorTileProperty.PRELOAD));
+};
+
+
+/**
+ * Return the associated {@link ol.source.VectorTile source} of the layer.
+ * @function
+ * @return {ol.source.VectorTile} Source.
+ * @api
+ */
+ol.layer.VectorTile.prototype.getSource;
+
+
+/**
+ * Whether we use interim tiles on error.
+ * @return {boolean} Use interim tiles on error.
+ * @observable
+ * @api
+ */
+ol.layer.VectorTile.prototype.getUseInterimTilesOnError = function() {
+  return /** @type {boolean} */ (
+      this.get(ol.layer.VectorTileProperty.USE_INTERIM_TILES_ON_ERROR));
+};
+
+
+/**
+ * Set the level as number to which we will preload tiles up to.
+ * @param {number} preload The level to preload tiles up to.
+ * @observable
+ * @api
+ */
+ol.layer.VectorTile.prototype.setPreload = function(preload) {
+  this.set(ol.layer.TileProperty.PRELOAD, preload);
+};
+
+
+/**
+ * Set whether we use interim tiles on error.
+ * @param {boolean} useInterimTilesOnError Use interim tiles on error.
+ * @observable
+ * @api
+ */
+ol.layer.VectorTile.prototype.setUseInterimTilesOnError =
+    function(useInterimTilesOnError) {
+  this.set(
+      ol.layer.TileProperty.USE_INTERIM_TILES_ON_ERROR, useInterimTilesOnError);
+};
+
+// FIXME test, especially polygons with holes and multipolygons
+// FIXME need to handle large thick features (where pixel size matters)
+// FIXME add offset and end to ol.geom.flat.transform.transform2D?
+
+goog.provide('ol.render.canvas.Immediate');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.vec.Mat4');
+goog.require('ol.array');
+goog.require('ol.color');
+goog.require('ol.extent');
+goog.require('ol.geom.flat.transform');
+goog.require('ol.has');
+goog.require('ol.render.VectorContext');
+goog.require('ol.render.canvas');
+goog.require('ol.vec.Mat4');
+
+
+
+/**
+ * @classdesc
+ * A concrete subclass of {@link ol.render.VectorContext} that implements
+ * direct rendering of features and geometries to an HTML5 Canvas context.
+ * Instances of this class are created internally by the library and
+ * provided to application code as vectorContext member of the
+ * {@link ol.render.Event} object associated with postcompose, precompose and
+ * render events emitted by layers and maps.
+ *
+ * @constructor
+ * @extends {ol.render.VectorContext}
+ * @param {CanvasRenderingContext2D} context Context.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.Extent} extent Extent.
+ * @param {goog.vec.Mat4.Number} transform Transform.
+ * @param {number} viewRotation View rotation.
+ * @struct
+ */
+ol.render.canvas.Immediate =
+    function(context, pixelRatio, extent, transform, viewRotation) {
+
+  /**
+   * @private
+   * @type {!Object.<string,
+   *        Array.<function(ol.render.canvas.Immediate)>>}
+   */
+  this.callbacksByZIndex_ = {};
+
+  /**
+   * @private
+   * @type {CanvasRenderingContext2D}
+   */
+  this.context_ = context;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.pixelRatio_ = pixelRatio;
+
+  /**
+   * @private
+   * @type {ol.Extent}
+   */
+  this.extent_ = extent;
+
+  /**
+   * @private
+   * @type {goog.vec.Mat4.Number}
+   */
+  this.transform_ = transform;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.viewRotation_ = viewRotation;
+
+  /**
+   * @private
+   * @type {?ol.render.canvas.FillState}
+   */
+  this.contextFillState_ = null;
+
+  /**
+   * @private
+   * @type {?ol.render.canvas.StrokeState}
+   */
+  this.contextStrokeState_ = null;
+
+  /**
+   * @private
+   * @type {?ol.render.canvas.TextState}
+   */
+  this.contextTextState_ = null;
+
+  /**
+   * @private
+   * @type {?ol.render.canvas.FillState}
+   */
+  this.fillState_ = null;
+
+  /**
+   * @private
+   * @type {?ol.render.canvas.StrokeState}
+   */
+  this.strokeState_ = null;
+
+  /**
+   * @private
+   * @type {HTMLCanvasElement|HTMLVideoElement|Image}
+   */
+  this.image_ = null;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.imageAnchorX_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.imageAnchorY_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.imageHeight_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.imageOpacity_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.imageOriginX_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.imageOriginY_ = 0;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.imageRotateWithView_ = false;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.imageRotation_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.imageScale_ = 0;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.imageSnapToPixel_ = false;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.imageWidth_ = 0;
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.text_ = '';
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.textOffsetX_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.textOffsetY_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.textRotation_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.textScale_ = 0;
+
+  /**
+   * @private
+   * @type {?ol.render.canvas.FillState}
+   */
+  this.textFillState_ = null;
+
+  /**
+   * @private
+   * @type {?ol.render.canvas.StrokeState}
+   */
+  this.textStrokeState_ = null;
+
+  /**
+   * @private
+   * @type {?ol.render.canvas.TextState}
+   */
+  this.textState_ = null;
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.pixelCoordinates_ = [];
+
+  /**
+   * @private
+   * @type {!goog.vec.Mat4.Number}
+   */
+  this.tmpLocalTransform_ = goog.vec.Mat4.createNumber();
+
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @private
+ */
+ol.render.canvas.Immediate.prototype.drawImages_ =
+    function(flatCoordinates, offset, end, stride) {
+  if (!this.image_) {
+    return;
+  }
+  goog.asserts.assert(offset === 0, 'offset should be 0');
+  goog.asserts.assert(end == flatCoordinates.length,
+      'end should be equal to the length of flatCoordinates');
+  var pixelCoordinates = ol.geom.flat.transform.transform2D(
+      flatCoordinates, offset, end, 2, this.transform_,
+      this.pixelCoordinates_);
+  var context = this.context_;
+  var localTransform = this.tmpLocalTransform_;
+  var alpha = context.globalAlpha;
+  if (this.imageOpacity_ != 1) {
+    context.globalAlpha = alpha * this.imageOpacity_;
+  }
+  var rotation = this.imageRotation_;
+  if (this.imageRotateWithView_) {
+    rotation += this.viewRotation_;
+  }
+  var i, ii;
+  for (i = 0, ii = pixelCoordinates.length; i < ii; i += 2) {
+    var x = pixelCoordinates[i] - this.imageAnchorX_;
+    var y = pixelCoordinates[i + 1] - this.imageAnchorY_;
+    if (this.imageSnapToPixel_) {
+      x = (x + 0.5) | 0;
+      y = (y + 0.5) | 0;
+    }
+    if (rotation !== 0 || this.imageScale_ != 1) {
+      var centerX = x + this.imageAnchorX_;
+      var centerY = y + this.imageAnchorY_;
+      ol.vec.Mat4.makeTransform2D(localTransform,
+          centerX, centerY, this.imageScale_, this.imageScale_,
+          rotation, -centerX, -centerY);
+      context.setTransform(
+          goog.vec.Mat4.getElement(localTransform, 0, 0),
+          goog.vec.Mat4.getElement(localTransform, 1, 0),
+          goog.vec.Mat4.getElement(localTransform, 0, 1),
+          goog.vec.Mat4.getElement(localTransform, 1, 1),
+          goog.vec.Mat4.getElement(localTransform, 0, 3),
+          goog.vec.Mat4.getElement(localTransform, 1, 3));
+    }
+    context.drawImage(this.image_, this.imageOriginX_, this.imageOriginY_,
+        this.imageWidth_, this.imageHeight_, x, y,
+        this.imageWidth_, this.imageHeight_);
+  }
+  if (rotation !== 0 || this.imageScale_ != 1) {
+    context.setTransform(1, 0, 0, 1, 0, 0);
+  }
+  if (this.imageOpacity_ != 1) {
+    context.globalAlpha = alpha;
+  }
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @private
+ */
+ol.render.canvas.Immediate.prototype.drawText_ =
+    function(flatCoordinates, offset, end, stride) {
+  if (!this.textState_ || this.text_ === '') {
+    return;
+  }
+  if (this.textFillState_) {
+    this.setContextFillState_(this.textFillState_);
+  }
+  if (this.textStrokeState_) {
+    this.setContextStrokeState_(this.textStrokeState_);
+  }
+  this.setContextTextState_(this.textState_);
+  goog.asserts.assert(offset === 0, 'offset should be 0');
+  goog.asserts.assert(end == flatCoordinates.length,
+      'end should be equal to the length of flatCoordinates');
+  var pixelCoordinates = ol.geom.flat.transform.transform2D(
+      flatCoordinates, offset, end, stride, this.transform_,
+      this.pixelCoordinates_);
+  var context = this.context_;
+  for (; offset < end; offset += stride) {
+    var x = pixelCoordinates[offset] + this.textOffsetX_;
+    var y = pixelCoordinates[offset + 1] + this.textOffsetY_;
+    if (this.textRotation_ !== 0 || this.textScale_ != 1) {
+      var localTransform = ol.vec.Mat4.makeTransform2D(this.tmpLocalTransform_,
+          x, y, this.textScale_, this.textScale_, this.textRotation_, -x, -y);
+      context.setTransform(
+          goog.vec.Mat4.getElement(localTransform, 0, 0),
+          goog.vec.Mat4.getElement(localTransform, 1, 0),
+          goog.vec.Mat4.getElement(localTransform, 0, 1),
+          goog.vec.Mat4.getElement(localTransform, 1, 1),
+          goog.vec.Mat4.getElement(localTransform, 0, 3),
+          goog.vec.Mat4.getElement(localTransform, 1, 3));
+    }
+    if (this.textStrokeState_) {
+      context.strokeText(this.text_, x, y);
+    }
+    if (this.textFillState_) {
+      context.fillText(this.text_, x, y);
+    }
+  }
+  if (this.textRotation_ !== 0 || this.textScale_ != 1) {
+    context.setTransform(1, 0, 0, 1, 0, 0);
+  }
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {boolean} close Close.
+ * @private
+ * @return {number} end End.
+ */
+ol.render.canvas.Immediate.prototype.moveToLineTo_ =
+    function(flatCoordinates, offset, end, stride, close) {
+  var context = this.context_;
+  var pixelCoordinates = ol.geom.flat.transform.transform2D(
+      flatCoordinates, offset, end, stride, this.transform_,
+      this.pixelCoordinates_);
+  context.moveTo(pixelCoordinates[0], pixelCoordinates[1]);
+  var i;
+  for (i = 2; i < pixelCoordinates.length; i += 2) {
+    context.lineTo(pixelCoordinates[i], pixelCoordinates[i + 1]);
+  }
+  if (close) {
+    context.lineTo(pixelCoordinates[0], pixelCoordinates[1]);
+  }
+  return end;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<number>} ends Ends.
+ * @param {number} stride Stride.
+ * @private
+ * @return {number} End.
+ */
+ol.render.canvas.Immediate.prototype.drawRings_ =
+    function(flatCoordinates, offset, ends, stride) {
+  var context = this.context_;
+  var i, ii;
+  for (i = 0, ii = ends.length; i < ii; ++i) {
+    offset = this.moveToLineTo_(
+        flatCoordinates, offset, ends[i], stride, true);
+    context.closePath(); // FIXME is this needed here?
+  }
+  return offset;
+};
+
+
+/**
+ * Register a function to be called for rendering at a given zIndex.  The
+ * function will be called asynchronously.  The callback will receive a
+ * reference to {@link ol.render.canvas.Immediate} context for drawing.
+ *
+ * @param {number} zIndex Z index.
+ * @param {function(ol.render.canvas.Immediate)} callback Callback.
+ * @api
+ */
+ol.render.canvas.Immediate.prototype.drawAsync = function(zIndex, callback) {
+  var zIndexKey = zIndex.toString();
+  var callbacks = this.callbacksByZIndex_[zIndexKey];
+  if (callbacks !== undefined) {
+    callbacks.push(callback);
+  } else {
+    this.callbacksByZIndex_[zIndexKey] = [callback];
+  }
+};
+
+
+/**
+ * Render a circle geometry into the canvas.  Rendering is immediate and uses
+ * the current fill and stroke styles.
+ *
+ * @param {ol.geom.Circle} circleGeometry Circle geometry.
+ * @api
+ */
+ol.render.canvas.Immediate.prototype.drawCircleGeometry =
+    function(circleGeometry) {
+  if (!ol.extent.intersects(this.extent_, circleGeometry.getExtent())) {
+    return;
+  }
+  if (this.fillState_ || this.strokeState_) {
+    if (this.fillState_) {
+      this.setContextFillState_(this.fillState_);
+    }
+    if (this.strokeState_) {
+      this.setContextStrokeState_(this.strokeState_);
+    }
+    var pixelCoordinates = ol.geom.transformSimpleGeometry2D(
+        circleGeometry, this.transform_, this.pixelCoordinates_);
+    var dx = pixelCoordinates[2] - pixelCoordinates[0];
+    var dy = pixelCoordinates[3] - pixelCoordinates[1];
+    var radius = Math.sqrt(dx * dx + dy * dy);
+    var context = this.context_;
+    context.beginPath();
+    context.arc(
+        pixelCoordinates[0], pixelCoordinates[1], radius, 0, 2 * Math.PI);
+    if (this.fillState_) {
+      context.fill();
+    }
+    if (this.strokeState_) {
+      context.stroke();
+    }
+  }
+  if (this.text_ !== '') {
+    this.drawText_(circleGeometry.getCenter(), 0, 2, 2);
+  }
+};
+
+
+/**
+ * Render a feature into the canvas.  In order to respect the zIndex of the
+ * style this method draws asynchronously and thus *after* calls to
+ * drawXxxxGeometry have been finished, effectively drawing the feature
+ * *on top* of everything else.  You probably should be using an
+ * {@link ol.layer.Vector} instead of calling this method directly.
+ *
+ * @param {ol.Feature} feature Feature.
+ * @param {ol.style.Style} style Style.
+ * @api
+ */
+ol.render.canvas.Immediate.prototype.drawFeature = function(feature, style) {
+  var geometry = style.getGeometryFunction()(feature);
+  if (!geometry ||
+      !ol.extent.intersects(this.extent_, geometry.getExtent())) {
+    return;
+  }
+  var zIndex = style.getZIndex();
+  if (zIndex === undefined) {
+    zIndex = 0;
+  }
+  this.drawAsync(zIndex, function(render) {
+    render.setFillStrokeStyle(style.getFill(), style.getStroke());
+    render.setImageStyle(style.getImage());
+    render.setTextStyle(style.getText());
+    var renderGeometry =
+        ol.render.canvas.Immediate.GEOMETRY_RENDERERS_[geometry.getType()];
+    goog.asserts.assert(renderGeometry !== undefined,
+        'renderGeometry should be defined');
+    renderGeometry.call(render, geometry, null);
+  });
+};
+
+
+/**
+ * Render a GeometryCollection to the canvas.  Rendering is immediate and
+ * uses the current styles appropriate for each geometry in the collection.
+ *
+ * @param {ol.geom.GeometryCollection} geometryCollectionGeometry Geometry
+ *     collection.
+ * @param {ol.Feature} feature Feature.
+ */
+ol.render.canvas.Immediate.prototype.drawGeometryCollectionGeometry =
+    function(geometryCollectionGeometry, feature) {
+  var geometries = geometryCollectionGeometry.getGeometriesArray();
+  var i, ii;
+  for (i = 0, ii = geometries.length; i < ii; ++i) {
+    var geometry = geometries[i];
+    var geometryRenderer =
+        ol.render.canvas.Immediate.GEOMETRY_RENDERERS_[geometry.getType()];
+    goog.asserts.assert(geometryRenderer !== undefined,
+        'geometryRenderer should be defined');
+    geometryRenderer.call(this, geometry, feature);
+  }
+};
+
+
+/**
+ * Render a Point geometry into the canvas.  Rendering is immediate and uses
+ * the current style.
+ *
+ * @param {ol.geom.Point|ol.render.Feature} pointGeometry Point geometry.
+ * @api
+ */
+ol.render.canvas.Immediate.prototype.drawPointGeometry =
+    function(pointGeometry) {
+  var flatCoordinates = pointGeometry.getFlatCoordinates();
+  var stride = pointGeometry.getStride();
+  if (this.image_) {
+    this.drawImages_(flatCoordinates, 0, flatCoordinates.length, stride);
+  }
+  if (this.text_ !== '') {
+    this.drawText_(flatCoordinates, 0, flatCoordinates.length, stride);
+  }
+};
+
+
+/**
+ * Render a MultiPoint geometry  into the canvas.  Rendering is immediate and
+ * uses the current style.
+ *
+ * @param {ol.geom.MultiPoint|ol.render.Feature} multiPointGeometry MultiPoint
+ *     geometry.
+ * @api
+ */
+ol.render.canvas.Immediate.prototype.drawMultiPointGeometry =
+    function(multiPointGeometry) {
+  var flatCoordinates = multiPointGeometry.getFlatCoordinates();
+  var stride = multiPointGeometry.getStride();
+  if (this.image_) {
+    this.drawImages_(flatCoordinates, 0, flatCoordinates.length, stride);
+  }
+  if (this.text_ !== '') {
+    this.drawText_(flatCoordinates, 0, flatCoordinates.length, stride);
+  }
+};
+
+
+/**
+ * Render a LineString into the canvas.  Rendering is immediate and uses
+ * the current style.
+ *
+ * @param {ol.geom.LineString|ol.render.Feature} lineStringGeometry Line
+ *     string geometry.
+ * @api
+ */
+ol.render.canvas.Immediate.prototype.drawLineStringGeometry =
+    function(lineStringGeometry) {
+  if (!ol.extent.intersects(this.extent_, lineStringGeometry.getExtent())) {
+    return;
+  }
+  if (this.strokeState_) {
+    this.setContextStrokeState_(this.strokeState_);
+    var context = this.context_;
+    var flatCoordinates = lineStringGeometry.getFlatCoordinates();
+    context.beginPath();
+    this.moveToLineTo_(flatCoordinates, 0, flatCoordinates.length,
+        lineStringGeometry.getStride(), false);
+    context.stroke();
+  }
+  if (this.text_ !== '') {
+    var flatMidpoint = lineStringGeometry.getFlatMidpoint();
+    this.drawText_(flatMidpoint, 0, 2, 2);
+  }
+};
+
+
+/**
+ * Render a MultiLineString geometry into the canvas.  Rendering is immediate
+ * and uses the current style.
+ *
+ * @param {ol.geom.MultiLineString|ol.render.Feature} multiLineStringGeometry
+ *     MultiLineString geometry.
+ * @api
+ */
+ol.render.canvas.Immediate.prototype.drawMultiLineStringGeometry =
+    function(multiLineStringGeometry) {
+  var geometryExtent = multiLineStringGeometry.getExtent();
+  if (!ol.extent.intersects(this.extent_, geometryExtent)) {
+    return;
+  }
+  if (this.strokeState_) {
+    this.setContextStrokeState_(this.strokeState_);
+    var context = this.context_;
+    var flatCoordinates = multiLineStringGeometry.getFlatCoordinates();
+    var offset = 0;
+    var ends = multiLineStringGeometry.getEnds();
+    var stride = multiLineStringGeometry.getStride();
+    context.beginPath();
+    var i, ii;
+    for (i = 0, ii = ends.length; i < ii; ++i) {
+      offset = this.moveToLineTo_(
+          flatCoordinates, offset, ends[i], stride, false);
+    }
+    context.stroke();
+  }
+  if (this.text_ !== '') {
+    var flatMidpoints = multiLineStringGeometry.getFlatMidpoints();
+    this.drawText_(flatMidpoints, 0, flatMidpoints.length, 2);
+  }
+};
+
+
+/**
+ * Render a Polygon geometry into the canvas.  Rendering is immediate and uses
+ * the current style.
+ *
+ * @param {ol.geom.Polygon|ol.render.Feature} polygonGeometry Polygon
+ *     geometry.
+ * @api
+ */
+ol.render.canvas.Immediate.prototype.drawPolygonGeometry =
+    function(polygonGeometry) {
+  if (!ol.extent.intersects(this.extent_, polygonGeometry.getExtent())) {
+    return;
+  }
+  if (this.strokeState_ || this.fillState_) {
+    if (this.fillState_) {
+      this.setContextFillState_(this.fillState_);
+    }
+    if (this.strokeState_) {
+      this.setContextStrokeState_(this.strokeState_);
+    }
+    var context = this.context_;
+    context.beginPath();
+    this.drawRings_(polygonGeometry.getOrientedFlatCoordinates(),
+        0, polygonGeometry.getEnds(), polygonGeometry.getStride());
+    if (this.fillState_) {
+      context.fill();
+    }
+    if (this.strokeState_) {
+      context.stroke();
+    }
+  }
+  if (this.text_ !== '') {
+    var flatInteriorPoint = polygonGeometry.getFlatInteriorPoint();
+    this.drawText_(flatInteriorPoint, 0, 2, 2);
+  }
+};
+
+
+/**
+ * Render MultiPolygon geometry into the canvas.  Rendering is immediate and
+ * uses the current style.
+ * @param {ol.geom.MultiPolygon} multiPolygonGeometry MultiPolygon geometry.
+ * @api
+ */
+ol.render.canvas.Immediate.prototype.drawMultiPolygonGeometry =
+    function(multiPolygonGeometry) {
+  if (!ol.extent.intersects(this.extent_, multiPolygonGeometry.getExtent())) {
+    return;
+  }
+  if (this.strokeState_ || this.fillState_) {
+    if (this.fillState_) {
+      this.setContextFillState_(this.fillState_);
+    }
+    if (this.strokeState_) {
+      this.setContextStrokeState_(this.strokeState_);
+    }
+    var context = this.context_;
+    var flatCoordinates = multiPolygonGeometry.getOrientedFlatCoordinates();
+    var offset = 0;
+    var endss = multiPolygonGeometry.getEndss();
+    var stride = multiPolygonGeometry.getStride();
+    var i, ii;
+    for (i = 0, ii = endss.length; i < ii; ++i) {
+      var ends = endss[i];
+      context.beginPath();
+      offset = this.drawRings_(flatCoordinates, offset, ends, stride);
+      if (this.fillState_) {
+        context.fill();
+      }
+      if (this.strokeState_) {
+        context.stroke();
+      }
+    }
+  }
+  if (this.text_ !== '') {
+    var flatInteriorPoints = multiPolygonGeometry.getFlatInteriorPoints();
+    this.drawText_(flatInteriorPoints, 0, flatInteriorPoints.length, 2);
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.Immediate.prototype.drawText = goog.abstractMethod;
+
+
+/**
+ * FIXME: empty description for jsdoc
+ */
+ol.render.canvas.Immediate.prototype.flush = function() {
+  /** @type {Array.<number>} */
+  var zs = Object.keys(this.callbacksByZIndex_).map(Number);
+  zs.sort(ol.array.numberSafeCompareFunction);
+  var i, ii, callbacks, j, jj;
+  for (i = 0, ii = zs.length; i < ii; ++i) {
+    callbacks = this.callbacksByZIndex_[zs[i].toString()];
+    for (j = 0, jj = callbacks.length; j < jj; ++j) {
+      callbacks[j](this);
+    }
+  }
+};
+
+
+/**
+ * @param {ol.render.canvas.FillState} fillState Fill state.
+ * @private
+ */
+ol.render.canvas.Immediate.prototype.setContextFillState_ =
+    function(fillState) {
+  var context = this.context_;
+  var contextFillState = this.contextFillState_;
+  if (!contextFillState) {
+    context.fillStyle = fillState.fillStyle;
+    this.contextFillState_ = {
+      fillStyle: fillState.fillStyle
+    };
+  } else {
+    if (contextFillState.fillStyle != fillState.fillStyle) {
+      contextFillState.fillStyle = context.fillStyle = fillState.fillStyle;
+    }
+  }
+};
+
+
+/**
+ * @param {ol.render.canvas.StrokeState} strokeState Stroke state.
+ * @private
+ */
+ol.render.canvas.Immediate.prototype.setContextStrokeState_ =
+    function(strokeState) {
+  var context = this.context_;
+  var contextStrokeState = this.contextStrokeState_;
+  if (!contextStrokeState) {
+    context.lineCap = strokeState.lineCap;
+    if (ol.has.CANVAS_LINE_DASH) {
+      context.setLineDash(strokeState.lineDash);
+    }
+    context.lineJoin = strokeState.lineJoin;
+    context.lineWidth = strokeState.lineWidth;
+    context.miterLimit = strokeState.miterLimit;
+    context.strokeStyle = strokeState.strokeStyle;
+    this.contextStrokeState_ = {
+      lineCap: strokeState.lineCap,
+      lineDash: strokeState.lineDash,
+      lineJoin: strokeState.lineJoin,
+      lineWidth: strokeState.lineWidth,
+      miterLimit: strokeState.miterLimit,
+      strokeStyle: strokeState.strokeStyle
+    };
+  } else {
+    if (contextStrokeState.lineCap != strokeState.lineCap) {
+      contextStrokeState.lineCap = context.lineCap = strokeState.lineCap;
+    }
+    if (ol.has.CANVAS_LINE_DASH) {
+      if (!goog.array.equals(
+          contextStrokeState.lineDash, strokeState.lineDash)) {
+        context.setLineDash(contextStrokeState.lineDash = strokeState.lineDash);
+      }
+    }
+    if (contextStrokeState.lineJoin != strokeState.lineJoin) {
+      contextStrokeState.lineJoin = context.lineJoin = strokeState.lineJoin;
+    }
+    if (contextStrokeState.lineWidth != strokeState.lineWidth) {
+      contextStrokeState.lineWidth = context.lineWidth = strokeState.lineWidth;
+    }
+    if (contextStrokeState.miterLimit != strokeState.miterLimit) {
+      contextStrokeState.miterLimit = context.miterLimit =
+          strokeState.miterLimit;
+    }
+    if (contextStrokeState.strokeStyle != strokeState.strokeStyle) {
+      contextStrokeState.strokeStyle = context.strokeStyle =
+          strokeState.strokeStyle;
+    }
+  }
+};
+
+
+/**
+ * @param {ol.render.canvas.TextState} textState Text state.
+ * @private
+ */
+ol.render.canvas.Immediate.prototype.setContextTextState_ =
+    function(textState) {
+  var context = this.context_;
+  var contextTextState = this.contextTextState_;
+  if (!contextTextState) {
+    context.font = textState.font;
+    context.textAlign = textState.textAlign;
+    context.textBaseline = textState.textBaseline;
+    this.contextTextState_ = {
+      font: textState.font,
+      textAlign: textState.textAlign,
+      textBaseline: textState.textBaseline
+    };
+  } else {
+    if (contextTextState.font != textState.font) {
+      contextTextState.font = context.font = textState.font;
+    }
+    if (contextTextState.textAlign != textState.textAlign) {
+      contextTextState.textAlign = context.textAlign = textState.textAlign;
+    }
+    if (contextTextState.textBaseline != textState.textBaseline) {
+      contextTextState.textBaseline = context.textBaseline =
+          textState.textBaseline;
+    }
+  }
+};
+
+
+/**
+ * Set the fill and stroke style for subsequent draw operations.  To clear
+ * either fill or stroke styles, pass null for the appropriate parameter.
+ *
+ * @param {ol.style.Fill} fillStyle Fill style.
+ * @param {ol.style.Stroke} strokeStyle Stroke style.
+ * @api
+ */
+ol.render.canvas.Immediate.prototype.setFillStrokeStyle =
+    function(fillStyle, strokeStyle) {
+  if (!fillStyle) {
+    this.fillState_ = null;
+  } else {
+    var fillStyleColor = fillStyle.getColor();
+    this.fillState_ = {
+      fillStyle: ol.color.asString(fillStyleColor ?
+          fillStyleColor : ol.render.canvas.defaultFillStyle)
+    };
+  }
+  if (!strokeStyle) {
+    this.strokeState_ = null;
+  } else {
+    var strokeStyleColor = strokeStyle.getColor();
+    var strokeStyleLineCap = strokeStyle.getLineCap();
+    var strokeStyleLineDash = strokeStyle.getLineDash();
+    var strokeStyleLineJoin = strokeStyle.getLineJoin();
+    var strokeStyleWidth = strokeStyle.getWidth();
+    var strokeStyleMiterLimit = strokeStyle.getMiterLimit();
+    this.strokeState_ = {
+      lineCap: strokeStyleLineCap !== undefined ?
+          strokeStyleLineCap : ol.render.canvas.defaultLineCap,
+      lineDash: strokeStyleLineDash ?
+          strokeStyleLineDash : ol.render.canvas.defaultLineDash,
+      lineJoin: strokeStyleLineJoin !== undefined ?
+          strokeStyleLineJoin : ol.render.canvas.defaultLineJoin,
+      lineWidth: this.pixelRatio_ * (strokeStyleWidth !== undefined ?
+          strokeStyleWidth : ol.render.canvas.defaultLineWidth),
+      miterLimit: strokeStyleMiterLimit !== undefined ?
+          strokeStyleMiterLimit : ol.render.canvas.defaultMiterLimit,
+      strokeStyle: ol.color.asString(strokeStyleColor ?
+          strokeStyleColor : ol.render.canvas.defaultStrokeStyle)
+    };
+  }
+};
+
+
+/**
+ * Set the image style for subsequent draw operations.  Pass null to remove
+ * the image style.
+ *
+ * @param {ol.style.Image} imageStyle Image style.
+ * @api
+ */
+ol.render.canvas.Immediate.prototype.setImageStyle = function(imageStyle) {
+  if (!imageStyle) {
+    this.image_ = null;
+  } else {
+    var imageAnchor = imageStyle.getAnchor();
+    // FIXME pixel ratio
+    var imageImage = imageStyle.getImage(1);
+    var imageOrigin = imageStyle.getOrigin();
+    var imageSize = imageStyle.getSize();
+    goog.asserts.assert(imageAnchor, 'imageAnchor must be truthy');
+    goog.asserts.assert(imageImage, 'imageImage must be truthy');
+    goog.asserts.assert(imageOrigin, 'imageOrigin must be truthy');
+    goog.asserts.assert(imageSize, 'imageSize must be truthy');
+    this.imageAnchorX_ = imageAnchor[0];
+    this.imageAnchorY_ = imageAnchor[1];
+    this.imageHeight_ = imageSize[1];
+    this.image_ = imageImage;
+    this.imageOpacity_ = imageStyle.getOpacity();
+    this.imageOriginX_ = imageOrigin[0];
+    this.imageOriginY_ = imageOrigin[1];
+    this.imageRotateWithView_ = imageStyle.getRotateWithView();
+    this.imageRotation_ = imageStyle.getRotation();
+    this.imageScale_ = imageStyle.getScale();
+    this.imageSnapToPixel_ = imageStyle.getSnapToPixel();
+    this.imageWidth_ = imageSize[0];
+  }
+};
+
+
+/**
+ * Set the text style for subsequent draw operations.  Pass null to
+ * remove the text style.
+ *
+ * @param {ol.style.Text} textStyle Text style.
+ * @api
+ */
+ol.render.canvas.Immediate.prototype.setTextStyle = function(textStyle) {
+  if (!textStyle) {
+    this.text_ = '';
+  } else {
+    var textFillStyle = textStyle.getFill();
+    if (!textFillStyle) {
+      this.textFillState_ = null;
+    } else {
+      var textFillStyleColor = textFillStyle.getColor();
+      this.textFillState_ = {
+        fillStyle: ol.color.asString(textFillStyleColor ?
+            textFillStyleColor : ol.render.canvas.defaultFillStyle)
+      };
+    }
+    var textStrokeStyle = textStyle.getStroke();
+    if (!textStrokeStyle) {
+      this.textStrokeState_ = null;
+    } else {
+      var textStrokeStyleColor = textStrokeStyle.getColor();
+      var textStrokeStyleLineCap = textStrokeStyle.getLineCap();
+      var textStrokeStyleLineDash = textStrokeStyle.getLineDash();
+      var textStrokeStyleLineJoin = textStrokeStyle.getLineJoin();
+      var textStrokeStyleWidth = textStrokeStyle.getWidth();
+      var textStrokeStyleMiterLimit = textStrokeStyle.getMiterLimit();
+      this.textStrokeState_ = {
+        lineCap: textStrokeStyleLineCap !== undefined ?
+            textStrokeStyleLineCap : ol.render.canvas.defaultLineCap,
+        lineDash: textStrokeStyleLineDash ?
+            textStrokeStyleLineDash : ol.render.canvas.defaultLineDash,
+        lineJoin: textStrokeStyleLineJoin !== undefined ?
+            textStrokeStyleLineJoin : ol.render.canvas.defaultLineJoin,
+        lineWidth: textStrokeStyleWidth !== undefined ?
+            textStrokeStyleWidth : ol.render.canvas.defaultLineWidth,
+        miterLimit: textStrokeStyleMiterLimit !== undefined ?
+            textStrokeStyleMiterLimit : ol.render.canvas.defaultMiterLimit,
+        strokeStyle: ol.color.asString(textStrokeStyleColor ?
+            textStrokeStyleColor : ol.render.canvas.defaultStrokeStyle)
+      };
+    }
+    var textFont = textStyle.getFont();
+    var textOffsetX = textStyle.getOffsetX();
+    var textOffsetY = textStyle.getOffsetY();
+    var textRotation = textStyle.getRotation();
+    var textScale = textStyle.getScale();
+    var textText = textStyle.getText();
+    var textTextAlign = textStyle.getTextAlign();
+    var textTextBaseline = textStyle.getTextBaseline();
+    this.textState_ = {
+      font: textFont !== undefined ?
+          textFont : ol.render.canvas.defaultFont,
+      textAlign: textTextAlign !== undefined ?
+          textTextAlign : ol.render.canvas.defaultTextAlign,
+      textBaseline: textTextBaseline !== undefined ?
+          textTextBaseline : ol.render.canvas.defaultTextBaseline
+    };
+    this.text_ = textText !== undefined ? textText : '';
+    this.textOffsetX_ =
+        textOffsetX !== undefined ? (this.pixelRatio_ * textOffsetX) : 0;
+    this.textOffsetY_ =
+        textOffsetY !== undefined ? (this.pixelRatio_ * textOffsetY) : 0;
+    this.textRotation_ = textRotation !== undefined ? textRotation : 0;
+    this.textScale_ = this.pixelRatio_ * (textScale !== undefined ?
+        textScale : 1);
+  }
+};
+
+
+/**
+ * @const
+ * @private
+ * @type {Object.<ol.geom.GeometryType,
+ *     function(this: ol.render.canvas.Immediate,
+ *         (ol.geom.Geometry|ol.render.Feature), Object)>}
+ */
+ol.render.canvas.Immediate.GEOMETRY_RENDERERS_ = {
+  'Point': ol.render.canvas.Immediate.prototype.drawPointGeometry,
+  'LineString': ol.render.canvas.Immediate.prototype.drawLineStringGeometry,
+  'Polygon': ol.render.canvas.Immediate.prototype.drawPolygonGeometry,
+  'MultiPoint': ol.render.canvas.Immediate.prototype.drawMultiPointGeometry,
+  'MultiLineString':
+      ol.render.canvas.Immediate.prototype.drawMultiLineStringGeometry,
+  'MultiPolygon': ol.render.canvas.Immediate.prototype.drawMultiPolygonGeometry,
+  'GeometryCollection':
+      ol.render.canvas.Immediate.prototype.drawGeometryCollectionGeometry,
+  'Circle': ol.render.canvas.Immediate.prototype.drawCircleGeometry
+};
+
+goog.provide('ol.renderer.canvas.Layer');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.vec.Mat4');
+goog.require('ol.dom');
+goog.require('ol.extent');
+goog.require('ol.layer.Layer');
+goog.require('ol.render.Event');
+goog.require('ol.render.EventType');
+goog.require('ol.render.canvas.Immediate');
+goog.require('ol.renderer.Layer');
+goog.require('ol.vec.Mat4');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.renderer.Layer}
+ * @param {ol.layer.Layer} layer Layer.
+ */
+ol.renderer.canvas.Layer = function(layer) {
+
+  goog.base(this, layer);
+
+  /**
+   * @private
+   * @type {!goog.vec.Mat4.Number}
+   */
+  this.transform_ = goog.vec.Mat4.createNumber();
+
+};
+goog.inherits(ol.renderer.canvas.Layer, ol.renderer.Layer);
+
+
+/**
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {ol.layer.LayerState} layerState Layer state.
+ * @param {CanvasRenderingContext2D} context Context.
+ */
+ol.renderer.canvas.Layer.prototype.composeFrame =
+    function(frameState, layerState, context) {
+
+  this.dispatchPreComposeEvent(context, frameState);
+
+  var image = this.getImage();
+  if (image) {
+
+    // clipped rendering if layer extent is set
+    var extent = layerState.extent;
+    var clipped = extent !== undefined;
+    if (clipped) {
+      goog.asserts.assert(extent !== undefined,
+          'layerState extent is defined');
+      var pixelRatio = frameState.pixelRatio;
+      var topLeft = ol.extent.getTopLeft(extent);
+      var topRight = ol.extent.getTopRight(extent);
+      var bottomRight = ol.extent.getBottomRight(extent);
+      var bottomLeft = ol.extent.getBottomLeft(extent);
+
+      ol.vec.Mat4.multVec2(frameState.coordinateToPixelMatrix,
+          topLeft, topLeft);
+      ol.vec.Mat4.multVec2(frameState.coordinateToPixelMatrix,
+          topRight, topRight);
+      ol.vec.Mat4.multVec2(frameState.coordinateToPixelMatrix,
+          bottomRight, bottomRight);
+      ol.vec.Mat4.multVec2(frameState.coordinateToPixelMatrix,
+          bottomLeft, bottomLeft);
+
+      context.save();
+      context.beginPath();
+      context.moveTo(topLeft[0] * pixelRatio, topLeft[1] * pixelRatio);
+      context.lineTo(topRight[0] * pixelRatio, topRight[1] * pixelRatio);
+      context.lineTo(bottomRight[0] * pixelRatio, bottomRight[1] * pixelRatio);
+      context.lineTo(bottomLeft[0] * pixelRatio, bottomLeft[1] * pixelRatio);
+      context.clip();
+    }
+
+    var imageTransform = this.getImageTransform();
+    // for performance reasons, context.save / context.restore is not used
+    // to save and restore the transformation matrix and the opacity.
+    // see http://jsperf.com/context-save-restore-versus-variable
+    var alpha = context.globalAlpha;
+    context.globalAlpha = layerState.opacity;
+
+    // for performance reasons, context.setTransform is only used
+    // when the view is rotated. see http://jsperf.com/canvas-transform
+    if (frameState.viewState.rotation === 0) {
+      var dx = goog.vec.Mat4.getElement(imageTransform, 0, 3);
+      var dy = goog.vec.Mat4.getElement(imageTransform, 1, 3);
+      var dw = image.width * goog.vec.Mat4.getElement(imageTransform, 0, 0);
+      var dh = image.height * goog.vec.Mat4.getElement(imageTransform, 1, 1);
+      context.drawImage(image, 0, 0, +image.width, +image.height,
+          Math.round(dx), Math.round(dy), Math.round(dw), Math.round(dh));
+    } else {
+      context.setTransform(
+          goog.vec.Mat4.getElement(imageTransform, 0, 0),
+          goog.vec.Mat4.getElement(imageTransform, 1, 0),
+          goog.vec.Mat4.getElement(imageTransform, 0, 1),
+          goog.vec.Mat4.getElement(imageTransform, 1, 1),
+          goog.vec.Mat4.getElement(imageTransform, 0, 3),
+          goog.vec.Mat4.getElement(imageTransform, 1, 3));
+      context.drawImage(image, 0, 0);
+      context.setTransform(1, 0, 0, 1, 0, 0);
+    }
+    context.globalAlpha = alpha;
+
+    if (clipped) {
+      context.restore();
+    }
+  }
+
+  this.dispatchPostComposeEvent(context, frameState);
+
+};
+
+
+/**
+ * @param {ol.render.EventType} type Event type.
+ * @param {CanvasRenderingContext2D} context Context.
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {goog.vec.Mat4.Number=} opt_transform Transform.
+ * @private
+ */
+ol.renderer.canvas.Layer.prototype.dispatchComposeEvent_ =
+    function(type, context, frameState, opt_transform) {
+  var layer = this.getLayer();
+  if (layer.hasListener(type)) {
+    var transform = opt_transform !== undefined ?
+        opt_transform : this.getTransform(frameState, 0);
+    var render = new ol.render.canvas.Immediate(
+        context, frameState.pixelRatio, frameState.extent, transform,
+        frameState.viewState.rotation);
+    var composeEvent = new ol.render.Event(type, layer, render, frameState,
+        context, null);
+    layer.dispatchEvent(composeEvent);
+    render.flush();
+  }
+};
+
+
+/**
+ * @param {CanvasRenderingContext2D} context Context.
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {goog.vec.Mat4.Number=} opt_transform Transform.
+ * @protected
+ */
+ol.renderer.canvas.Layer.prototype.dispatchPostComposeEvent =
+    function(context, frameState, opt_transform) {
+  this.dispatchComposeEvent_(ol.render.EventType.POSTCOMPOSE, context,
+      frameState, opt_transform);
+};
+
+
+/**
+ * @param {CanvasRenderingContext2D} context Context.
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {goog.vec.Mat4.Number=} opt_transform Transform.
+ * @protected
+ */
+ol.renderer.canvas.Layer.prototype.dispatchPreComposeEvent =
+    function(context, frameState, opt_transform) {
+  this.dispatchComposeEvent_(ol.render.EventType.PRECOMPOSE, context,
+      frameState, opt_transform);
+};
+
+
+/**
+ * @param {CanvasRenderingContext2D} context Context.
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {goog.vec.Mat4.Number=} opt_transform Transform.
+ * @protected
+ */
+ol.renderer.canvas.Layer.prototype.dispatchRenderEvent =
+    function(context, frameState, opt_transform) {
+  this.dispatchComposeEvent_(ol.render.EventType.RENDER, context,
+      frameState, opt_transform);
+};
+
+
+/**
+ * @return {HTMLCanvasElement|HTMLVideoElement|Image} Canvas.
+ */
+ol.renderer.canvas.Layer.prototype.getImage = goog.abstractMethod;
+
+
+/**
+ * @return {!goog.vec.Mat4.Number} Image transform.
+ */
+ol.renderer.canvas.Layer.prototype.getImageTransform = goog.abstractMethod;
+
+
+/**
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {number} offsetX Offset on the x-axis in view coordinates.
+ * @protected
+ * @return {!goog.vec.Mat4.Number} Transform.
+ */
+ol.renderer.canvas.Layer.prototype.getTransform =
+    function(frameState, offsetX) {
+  var viewState = frameState.viewState;
+  var pixelRatio = frameState.pixelRatio;
+  return ol.vec.Mat4.makeTransform2D(this.transform_,
+      pixelRatio * frameState.size[0] / 2,
+      pixelRatio * frameState.size[1] / 2,
+      pixelRatio / viewState.resolution,
+      -pixelRatio / viewState.resolution,
+      -viewState.rotation,
+      -viewState.center[0] + offsetX,
+      -viewState.center[1]);
+};
+
+
+/**
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {ol.layer.LayerState} layerState Layer state.
+ * @return {boolean} whether composeFrame should be called.
+ */
+ol.renderer.canvas.Layer.prototype.prepareFrame = goog.abstractMethod;
+
+
+/**
+ * @param {ol.Pixel} pixelOnMap Pixel.
+ * @param {goog.vec.Mat4.Number} imageTransformInv The transformation matrix
+ *        to convert from a map pixel to a canvas pixel.
+ * @return {ol.Pixel}
+ * @protected
+ */
+ol.renderer.canvas.Layer.prototype.getPixelOnCanvas =
+    function(pixelOnMap, imageTransformInv) {
+  var pixelOnCanvas = [0, 0];
+  ol.vec.Mat4.multVec2(imageTransformInv, pixelOnMap, pixelOnCanvas);
+  return pixelOnCanvas;
+};
+
+
+/**
+ * @param {ol.Size} size Size.
+ * @return {boolean} True when the canvas with the current size does not exceed
+ *     the maximum dimensions.
+ */
+ol.renderer.canvas.Layer.testCanvasSize = (function() {
+
+  /**
+   * @type {CanvasRenderingContext2D}
+   */
+  var context = null;
+
+  /**
+   * @type {ImageData}
+   */
+  var imageData = null;
+
+  return function(size) {
+    if (!context) {
+      context = ol.dom.createCanvasContext2D(1, 1);
+      imageData = context.createImageData(1, 1);
+      var data = imageData.data;
+      data[0] = 42;
+      data[1] = 84;
+      data[2] = 126;
+      data[3] = 255;
+    }
+    var canvas = context.canvas;
+    var good = size[0] <= canvas.width && size[1] <= canvas.height;
+    if (!good) {
+      canvas.width = size[0];
+      canvas.height = size[1];
+      var x = size[0] - 1;
+      var y = size[1] - 1;
+      context.putImageData(imageData, x, y);
+      var result = context.getImageData(x, y, 1, 1);
+      good = goog.array.equals(imageData.data, result.data);
+    }
+    return good;
+  };
+})();
+
+goog.provide('ol.render.IReplayGroup');
+
+goog.require('ol.render.VectorContext');
+
+
+/**
+ * @enum {string}
+ */
+ol.render.ReplayType = {
+  IMAGE: 'Image',
+  LINE_STRING: 'LineString',
+  POLYGON: 'Polygon',
+  TEXT: 'Text'
+};
+
+
+/**
+ * @const
+ * @type {Array.<ol.render.ReplayType>}
+ */
+ol.render.REPLAY_ORDER = [
+  ol.render.ReplayType.POLYGON,
+  ol.render.ReplayType.LINE_STRING,
+  ol.render.ReplayType.IMAGE,
+  ol.render.ReplayType.TEXT
+];
+
+
+
+/**
+ * @interface
+ */
+ol.render.IReplayGroup = function() {
+};
+
+
+/**
+ * @param {number|undefined} zIndex Z index.
+ * @param {ol.render.ReplayType} replayType Replay type.
+ * @return {ol.render.VectorContext} Replay.
+ */
+ol.render.IReplayGroup.prototype.getReplay = function(zIndex, replayType) {
+};
+
+
+/**
+ * @return {boolean} Is empty.
+ */
+ol.render.IReplayGroup.prototype.isEmpty = function() {
+};
+
+// FIXME add option to apply snapToPixel to all coordinates?
+// FIXME can eliminate empty set styles and strokes (when all geoms skipped)
+
+goog.provide('ol.render.canvas.ImageReplay');
+goog.provide('ol.render.canvas.LineStringReplay');
+goog.provide('ol.render.canvas.PolygonReplay');
+goog.provide('ol.render.canvas.Replay');
+goog.provide('ol.render.canvas.ReplayGroup');
+goog.provide('ol.render.canvas.TextReplay');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.object');
+goog.require('goog.vec.Mat4');
+goog.require('ol');
+goog.require('ol.array');
+goog.require('ol.color');
+goog.require('ol.dom');
+goog.require('ol.extent');
+goog.require('ol.extent.Relationship');
+goog.require('ol.geom.flat.simplify');
+goog.require('ol.geom.flat.transform');
+goog.require('ol.has');
+goog.require('ol.render.IReplayGroup');
+goog.require('ol.render.VectorContext');
+goog.require('ol.render.canvas');
+goog.require('ol.vec.Mat4');
+
+
+/**
+ * @enum {number}
+ */
+ol.render.canvas.Instruction = {
+  BEGIN_GEOMETRY: 0,
+  BEGIN_PATH: 1,
+  CIRCLE: 2,
+  CLOSE_PATH: 3,
+  DRAW_IMAGE: 4,
+  DRAW_TEXT: 5,
+  END_GEOMETRY: 6,
+  FILL: 7,
+  MOVE_TO_LINE_TO: 8,
+  SET_FILL_STYLE: 9,
+  SET_STROKE_STYLE: 10,
+  SET_TEXT_STYLE: 11,
+  STROKE: 12
+};
+
+
+
+/**
+ * @constructor
+ * @extends {ol.render.VectorContext}
+ * @param {number} tolerance Tolerance.
+ * @param {ol.Extent} maxExtent Maximum extent.
+ * @param {number} resolution Resolution.
+ * @protected
+ * @struct
+ */
+ol.render.canvas.Replay = function(tolerance, maxExtent, resolution) {
+  goog.base(this);
+
+  /**
+   * @protected
+   * @type {number}
+   */
+  this.tolerance = tolerance;
+
+  /**
+   * @protected
+   * @const
+   * @type {ol.Extent}
+   */
+  this.maxExtent = maxExtent;
+
+  /**
+   * @private
+   * @type {ol.Extent}
+   */
+  this.bufferedMaxExtent_ = null;
+
+  /**
+   * @protected
+   * @type {number}
+   */
+  this.maxLineWidth = 0;
+
+  /**
+   * @protected
+   * @const
+   * @type {number}
+   */
+  this.resolution = resolution;
+
+  /**
+   * @private
+   * @type {Array.<*>}
+   */
+  this.beginGeometryInstruction1_ = null;
+
+  /**
+   * @private
+   * @type {Array.<*>}
+   */
+  this.beginGeometryInstruction2_ = null;
+
+  /**
+   * @protected
+   * @type {Array.<*>}
+   */
+  this.instructions = [];
+
+  /**
+   * @protected
+   * @type {Array.<number>}
+   */
+  this.coordinates = [];
+
+  /**
+   * @private
+   * @type {goog.vec.Mat4.Number}
+   */
+  this.renderedTransform_ = goog.vec.Mat4.createNumber();
+
+  /**
+   * @protected
+   * @type {Array.<*>}
+   */
+  this.hitDetectionInstructions = [];
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.pixelCoordinates_ = [];
+
+  /**
+   * @private
+   * @type {!goog.vec.Mat4.Number}
+   */
+  this.tmpLocalTransform_ = goog.vec.Mat4.createNumber();
+};
+goog.inherits(ol.render.canvas.Replay, ol.render.VectorContext);
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {boolean} close Close.
+ * @protected
+ * @return {number} My end.
+ */
+ol.render.canvas.Replay.prototype.appendFlatCoordinates =
+    function(flatCoordinates, offset, end, stride, close) {
+
+  var myEnd = this.coordinates.length;
+  var extent = this.getBufferedMaxExtent();
+  var lastCoord = [flatCoordinates[offset], flatCoordinates[offset + 1]];
+  var nextCoord = [NaN, NaN];
+  var skipped = true;
+
+  var i, lastRel, nextRel;
+  for (i = offset + stride; i < end; i += stride) {
+    nextCoord[0] = flatCoordinates[i];
+    nextCoord[1] = flatCoordinates[i + 1];
+    nextRel = ol.extent.coordinateRelationship(extent, nextCoord);
+    if (nextRel !== lastRel) {
+      if (skipped) {
+        this.coordinates[myEnd++] = lastCoord[0];
+        this.coordinates[myEnd++] = lastCoord[1];
+      }
+      this.coordinates[myEnd++] = nextCoord[0];
+      this.coordinates[myEnd++] = nextCoord[1];
+      skipped = false;
+    } else if (nextRel === ol.extent.Relationship.INTERSECTING) {
+      this.coordinates[myEnd++] = nextCoord[0];
+      this.coordinates[myEnd++] = nextCoord[1];
+      skipped = false;
+    } else {
+      skipped = true;
+    }
+    lastCoord[0] = nextCoord[0];
+    lastCoord[1] = nextCoord[1];
+    lastRel = nextRel;
+  }
+
+  // handle case where there is only one point to append
+  if (i === offset + stride) {
+    this.coordinates[myEnd++] = lastCoord[0];
+    this.coordinates[myEnd++] = lastCoord[1];
+  }
+
+  if (close) {
+    this.coordinates[myEnd++] = flatCoordinates[offset];
+    this.coordinates[myEnd++] = flatCoordinates[offset + 1];
+  }
+  return myEnd;
+};
+
+
+/**
+ * @protected
+ * @param {ol.geom.Geometry|ol.render.Feature} geometry Geometry.
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ */
+ol.render.canvas.Replay.prototype.beginGeometry = function(geometry, feature) {
+  this.beginGeometryInstruction1_ =
+      [ol.render.canvas.Instruction.BEGIN_GEOMETRY, feature, 0];
+  this.instructions.push(this.beginGeometryInstruction1_);
+  this.beginGeometryInstruction2_ =
+      [ol.render.canvas.Instruction.BEGIN_GEOMETRY, feature, 0];
+  this.hitDetectionInstructions.push(this.beginGeometryInstruction2_);
+};
+
+
+/**
+ * @private
+ * @param {CanvasRenderingContext2D} context Context.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {goog.vec.Mat4.Number} transform Transform.
+ * @param {number} viewRotation View rotation.
+ * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
+ *     to skip.
+ * @param {Array.<*>} instructions Instructions array.
+ * @param {function((ol.Feature|ol.render.Feature)): T|undefined}
+ *     featureCallback Feature callback.
+ * @param {ol.Extent=} opt_hitExtent Only check features that intersect this
+ *     extent.
+ * @return {T|undefined} Callback result.
+ * @template T
+ */
+ol.render.canvas.Replay.prototype.replay_ = function(
+    context, pixelRatio, transform, viewRotation, skippedFeaturesHash,
+    instructions, featureCallback, opt_hitExtent) {
+  /** @type {Array.<number>} */
+  var pixelCoordinates;
+  if (ol.vec.Mat4.equals2D(transform, this.renderedTransform_)) {
+    pixelCoordinates = this.pixelCoordinates_;
+  } else {
+    pixelCoordinates = ol.geom.flat.transform.transform2D(
+        this.coordinates, 0, this.coordinates.length, 2,
+        transform, this.pixelCoordinates_);
+    goog.vec.Mat4.setFromArray(this.renderedTransform_, transform);
+    goog.asserts.assert(pixelCoordinates === this.pixelCoordinates_,
+        'pixelCoordinates should be the same as this.pixelCoordinates_');
+  }
+  var skipFeatures = !goog.object.isEmpty(skippedFeaturesHash);
+  var i = 0; // instruction index
+  var ii = instructions.length; // end of instructions
+  var d = 0; // data index
+  var dd; // end of per-instruction data
+  var localTransform = this.tmpLocalTransform_;
+  var prevX, prevY, roundX, roundY;
+  while (i < ii) {
+    var instruction = instructions[i];
+    var type = /** @type {ol.render.canvas.Instruction} */ (instruction[0]);
+    var feature, fill, stroke, text, x, y;
+    switch (type) {
+      case ol.render.canvas.Instruction.BEGIN_GEOMETRY:
+        feature = /** @type {ol.Feature|ol.render.Feature} */ (instruction[1]);
+        if ((skipFeatures &&
+            skippedFeaturesHash[goog.getUid(feature).toString()]) ||
+            !feature.getGeometry()) {
+          i = /** @type {number} */ (instruction[2]);
+        } else if (opt_hitExtent !== undefined && !ol.extent.intersects(
+            /** @type {Array<number>} */ (opt_hitExtent),
+            feature.getGeometry().getExtent())) {
+          i = /** @type {number} */ (instruction[2]);
+        } else {
+          ++i;
+        }
+        break;
+      case ol.render.canvas.Instruction.BEGIN_PATH:
+        context.beginPath();
+        ++i;
+        break;
+      case ol.render.canvas.Instruction.CIRCLE:
+        goog.asserts.assert(goog.isNumber(instruction[1]),
+            'second instruction should be a number');
+        d = /** @type {number} */ (instruction[1]);
+        var x1 = pixelCoordinates[d];
+        var y1 = pixelCoordinates[d + 1];
+        var x2 = pixelCoordinates[d + 2];
+        var y2 = pixelCoordinates[d + 3];
+        var dx = x2 - x1;
+        var dy = y2 - y1;
+        var r = Math.sqrt(dx * dx + dy * dy);
+        context.arc(x1, y1, r, 0, 2 * Math.PI, true);
+        ++i;
+        break;
+      case ol.render.canvas.Instruction.CLOSE_PATH:
+        context.closePath();
+        ++i;
+        break;
+      case ol.render.canvas.Instruction.DRAW_IMAGE:
+        goog.asserts.assert(goog.isNumber(instruction[1]),
+            'second instruction should be a number');
+        d = /** @type {number} */ (instruction[1]);
+        goog.asserts.assert(goog.isNumber(instruction[2]),
+            'third instruction should be a number');
+        dd = /** @type {number} */ (instruction[2]);
+        var image =  /** @type {HTMLCanvasElement|HTMLVideoElement|Image} */
+            (instruction[3]);
+        // Remaining arguments in DRAW_IMAGE are in alphabetical order
+        var anchorX = /** @type {number} */ (instruction[4]) * pixelRatio;
+        var anchorY = /** @type {number} */ (instruction[5]) * pixelRatio;
+        var height = /** @type {number} */ (instruction[6]);
+        var opacity = /** @type {number} */ (instruction[7]);
+        var originX = /** @type {number} */ (instruction[8]);
+        var originY = /** @type {number} */ (instruction[9]);
+        var rotateWithView = /** @type {boolean} */ (instruction[10]);
+        var rotation = /** @type {number} */ (instruction[11]);
+        var scale = /** @type {number} */ (instruction[12]);
+        var snapToPixel = /** @type {boolean} */ (instruction[13]);
+        var width = /** @type {number} */ (instruction[14]);
+        if (rotateWithView) {
+          rotation += viewRotation;
+        }
+        for (; d < dd; d += 2) {
+          x = pixelCoordinates[d] - anchorX;
+          y = pixelCoordinates[d + 1] - anchorY;
+          if (snapToPixel) {
+            x = (x + 0.5) | 0;
+            y = (y + 0.5) | 0;
+          }
+          if (scale != 1 || rotation !== 0) {
+            var centerX = x + anchorX;
+            var centerY = y + anchorY;
+            ol.vec.Mat4.makeTransform2D(
+                localTransform, centerX, centerY, scale, scale,
+                rotation, -centerX, -centerY);
+            context.setTransform(
+                goog.vec.Mat4.getElement(localTransform, 0, 0),
+                goog.vec.Mat4.getElement(localTransform, 1, 0),
+                goog.vec.Mat4.getElement(localTransform, 0, 1),
+                goog.vec.Mat4.getElement(localTransform, 1, 1),
+                goog.vec.Mat4.getElement(localTransform, 0, 3),
+                goog.vec.Mat4.getElement(localTransform, 1, 3));
+          }
+          var alpha = context.globalAlpha;
+          if (opacity != 1) {
+            context.globalAlpha = alpha * opacity;
+          }
+
+          context.drawImage(image, originX, originY, width, height,
+              x, y, width * pixelRatio, height * pixelRatio);
+
+          if (opacity != 1) {
+            context.globalAlpha = alpha;
+          }
+          if (scale != 1 || rotation !== 0) {
+            context.setTransform(1, 0, 0, 1, 0, 0);
+          }
+        }
+        ++i;
+        break;
+      case ol.render.canvas.Instruction.DRAW_TEXT:
+        goog.asserts.assert(goog.isNumber(instruction[1]),
+            '2nd instruction should be a number');
+        d = /** @type {number} */ (instruction[1]);
+        goog.asserts.assert(goog.isNumber(instruction[2]),
+            '3rd instruction should be a number');
+        dd = /** @type {number} */ (instruction[2]);
+        goog.asserts.assert(goog.isString(instruction[3]),
+            '4th instruction should be a string');
+        text = /** @type {string} */ (instruction[3]);
+        goog.asserts.assert(goog.isNumber(instruction[4]),
+            '5th instruction should be a number');
+        var offsetX = /** @type {number} */ (instruction[4]) * pixelRatio;
+        goog.asserts.assert(goog.isNumber(instruction[5]),
+            '6th instruction should be a number');
+        var offsetY = /** @type {number} */ (instruction[5]) * pixelRatio;
+        goog.asserts.assert(goog.isNumber(instruction[6]),
+            '7th instruction should be a number');
+        rotation = /** @type {number} */ (instruction[6]);
+        goog.asserts.assert(goog.isNumber(instruction[7]),
+            '8th instruction should be a number');
+        scale = /** @type {number} */ (instruction[7]) * pixelRatio;
+        goog.asserts.assert(goog.isBoolean(instruction[8]),
+            '9th instruction should be a boolean');
+        fill = /** @type {boolean} */ (instruction[8]);
+        goog.asserts.assert(goog.isBoolean(instruction[9]),
+            '10th instruction should be a boolean');
+        stroke = /** @type {boolean} */ (instruction[9]);
+        for (; d < dd; d += 2) {
+          x = pixelCoordinates[d] + offsetX;
+          y = pixelCoordinates[d + 1] + offsetY;
+          if (scale != 1 || rotation !== 0) {
+            ol.vec.Mat4.makeTransform2D(
+                localTransform, x, y, scale, scale, rotation, -x, -y);
+            context.setTransform(
+                goog.vec.Mat4.getElement(localTransform, 0, 0),
+                goog.vec.Mat4.getElement(localTransform, 1, 0),
+                goog.vec.Mat4.getElement(localTransform, 0, 1),
+                goog.vec.Mat4.getElement(localTransform, 1, 1),
+                goog.vec.Mat4.getElement(localTransform, 0, 3),
+                goog.vec.Mat4.getElement(localTransform, 1, 3));
+          }
+
+          // Support multiple lines separated by \n
+          var lines = text.split('\n');
+          var numLines = lines.length;
+          var fontSize, lineY;
+          if (numLines > 1) {
+            // Estimate line height using width of capital M, and add padding
+            fontSize = Math.round(context.measureText('M').width * 1.5);
+            lineY = y - (((numLines - 1) / 2) * fontSize);
+          } else {
+            // No need to calculate line height/offset for a single line
+            fontSize = 0;
+            lineY = y;
+          }
+
+          for (var lineIndex = 0; lineIndex < numLines; lineIndex++) {
+            var line = lines[lineIndex];
+            if (stroke) {
+              context.strokeText(line, x, lineY);
+            }
+            if (fill) {
+              context.fillText(line, x, lineY);
+            }
+
+            // Move next line down by fontSize px
+            lineY = lineY + fontSize;
+          }
+
+          if (scale != 1 || rotation !== 0) {
+            context.setTransform(1, 0, 0, 1, 0, 0);
+          }
+        }
+        ++i;
+        break;
+      case ol.render.canvas.Instruction.END_GEOMETRY:
+        if (featureCallback !== undefined) {
+          feature =
+              /** @type {ol.Feature|ol.render.Feature} */ (instruction[1]);
+          var result = featureCallback(feature);
+          if (result) {
+            return result;
+          }
+        }
+        ++i;
+        break;
+      case ol.render.canvas.Instruction.FILL:
+        context.fill();
+        ++i;
+        break;
+      case ol.render.canvas.Instruction.MOVE_TO_LINE_TO:
+        goog.asserts.assert(goog.isNumber(instruction[1]),
+            '2nd instruction should be a number');
+        d = /** @type {number} */ (instruction[1]);
+        goog.asserts.assert(goog.isNumber(instruction[2]),
+            '3rd instruction should be a number');
+        dd = /** @type {number} */ (instruction[2]);
+        x = pixelCoordinates[d];
+        y = pixelCoordinates[d + 1];
+        roundX = (x + 0.5) | 0;
+        roundY = (y + 0.5) | 0;
+        if (roundX !== prevX || roundY !== prevY) {
+          context.moveTo(x, y);
+          prevX = roundX;
+          prevY = roundY;
+        }
+        for (d += 2; d < dd; d += 2) {
+          x = pixelCoordinates[d];
+          y = pixelCoordinates[d + 1];
+          roundX = (x + 0.5) | 0;
+          roundY = (y + 0.5) | 0;
+          if (roundX !== prevX || roundY !== prevY) {
+            context.lineTo(x, y);
+            prevX = roundX;
+            prevY = roundY;
+          }
+        }
+        ++i;
+        break;
+      case ol.render.canvas.Instruction.SET_FILL_STYLE:
+        goog.asserts.assert(goog.isString(instruction[1]),
+            '2nd instruction should be a string');
+        context.fillStyle = /** @type {string} */ (instruction[1]);
+        ++i;
+        break;
+      case ol.render.canvas.Instruction.SET_STROKE_STYLE:
+        goog.asserts.assert(goog.isString(instruction[1]),
+            '2nd instruction should be a string');
+        goog.asserts.assert(goog.isNumber(instruction[2]),
+            '3rd instruction should be a number');
+        goog.asserts.assert(goog.isString(instruction[3]),
+            '4rd instruction should be a string');
+        goog.asserts.assert(goog.isString(instruction[4]),
+            '5th instruction should be a string');
+        goog.asserts.assert(goog.isNumber(instruction[5]),
+            '6th instruction should be a number');
+        goog.asserts.assert(instruction[6],
+            '7th instruction should not be null');
+        var usePixelRatio = instruction[7] !== undefined ?
+            instruction[7] : true;
+        var lineWidth = /** @type {number} */ (instruction[2]);
+        context.strokeStyle = /** @type {string} */ (instruction[1]);
+        context.lineWidth = usePixelRatio ? lineWidth * pixelRatio : lineWidth;
+        context.lineCap = /** @type {string} */ (instruction[3]);
+        context.lineJoin = /** @type {string} */ (instruction[4]);
+        context.miterLimit = /** @type {number} */ (instruction[5]);
+        if (ol.has.CANVAS_LINE_DASH) {
+          context.setLineDash(/** @type {Array.<number>} */ (instruction[6]));
+        }
+        prevX = NaN;
+        prevY = NaN;
+        ++i;
+        break;
+      case ol.render.canvas.Instruction.SET_TEXT_STYLE:
+        goog.asserts.assert(goog.isString(instruction[1]),
+            '2nd instruction should be a string');
+        goog.asserts.assert(goog.isString(instruction[2]),
+            '3rd instruction should be a string');
+        goog.asserts.assert(goog.isString(instruction[3]),
+            '4th instruction should be a string');
+        context.font = /** @type {string} */ (instruction[1]);
+        context.textAlign = /** @type {string} */ (instruction[2]);
+        context.textBaseline = /** @type {string} */ (instruction[3]);
+        ++i;
+        break;
+      case ol.render.canvas.Instruction.STROKE:
+        context.stroke();
+        ++i;
+        break;
+      default:
+        goog.asserts.fail('Unknown canvas render instruction');
+        ++i; // consume the instruction anyway, to avoid an infinite loop
+        break;
+    }
+  }
+  // assert that all instructions were consumed
+  goog.asserts.assert(i == instructions.length,
+      'all instructions should be consumed');
+  return undefined;
+};
+
+
+/**
+ * @param {CanvasRenderingContext2D} context Context.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {goog.vec.Mat4.Number} transform Transform.
+ * @param {number} viewRotation View rotation.
+ * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
+ *     to skip.
+ */
+ol.render.canvas.Replay.prototype.replay = function(
+    context, pixelRatio, transform, viewRotation, skippedFeaturesHash) {
+  var instructions = this.instructions;
+  this.replay_(context, pixelRatio, transform, viewRotation,
+      skippedFeaturesHash, instructions, undefined);
+};
+
+
+/**
+ * @param {CanvasRenderingContext2D} context Context.
+ * @param {goog.vec.Mat4.Number} transform Transform.
+ * @param {number} viewRotation View rotation.
+ * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
+ *     to skip.
+ * @param {function((ol.Feature|ol.render.Feature)): T=} opt_featureCallback
+ *     Feature callback.
+ * @param {ol.Extent=} opt_hitExtent Only check features that intersect this
+ *     extent.
+ * @return {T|undefined} Callback result.
+ * @template T
+ */
+ol.render.canvas.Replay.prototype.replayHitDetection = function(
+    context, transform, viewRotation, skippedFeaturesHash,
+    opt_featureCallback, opt_hitExtent) {
+  var instructions = this.hitDetectionInstructions;
+  return this.replay_(context, 1, transform, viewRotation,
+      skippedFeaturesHash, instructions, opt_featureCallback, opt_hitExtent);
+};
+
+
+/**
+ * @private
+ */
+ol.render.canvas.Replay.prototype.reverseHitDetectionInstructions_ =
+    function() {
+  var hitDetectionInstructions = this.hitDetectionInstructions;
+  // step 1 - reverse array
+  hitDetectionInstructions.reverse();
+  // step 2 - reverse instructions within geometry blocks
+  var i;
+  var n = hitDetectionInstructions.length;
+  var instruction;
+  var type;
+  var begin = -1;
+  for (i = 0; i < n; ++i) {
+    instruction = hitDetectionInstructions[i];
+    type = /** @type {ol.render.canvas.Instruction} */ (instruction[0]);
+    if (type == ol.render.canvas.Instruction.END_GEOMETRY) {
+      goog.asserts.assert(begin == -1, 'begin should be -1');
+      begin = i;
+    } else if (type == ol.render.canvas.Instruction.BEGIN_GEOMETRY) {
+      instruction[2] = i;
+      goog.asserts.assert(begin >= 0,
+          'begin should be larger than or equal to 0');
+      ol.array.reverseSubArray(this.hitDetectionInstructions, begin, i);
+      begin = -1;
+    }
+  }
+};
+
+
+/**
+ * @param {ol.geom.Geometry|ol.render.Feature} geometry Geometry.
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ */
+ol.render.canvas.Replay.prototype.endGeometry = function(geometry, feature) {
+  goog.asserts.assert(this.beginGeometryInstruction1_,
+      'this.beginGeometryInstruction1_ should not be null');
+  this.beginGeometryInstruction1_[2] = this.instructions.length;
+  this.beginGeometryInstruction1_ = null;
+  goog.asserts.assert(this.beginGeometryInstruction2_,
+      'this.beginGeometryInstruction2_ should not be null');
+  this.beginGeometryInstruction2_[2] = this.hitDetectionInstructions.length;
+  this.beginGeometryInstruction2_ = null;
+  var endGeometryInstruction =
+      [ol.render.canvas.Instruction.END_GEOMETRY, feature];
+  this.instructions.push(endGeometryInstruction);
+  this.hitDetectionInstructions.push(endGeometryInstruction);
+};
+
+
+/**
+ * FIXME empty description for jsdoc
+ */
+ol.render.canvas.Replay.prototype.finish = ol.nullFunction;
+
+
+/**
+ * Get the buffered rendering extent.  Rendering will be clipped to the extent
+ * provided to the constructor.  To account for symbolizers that may intersect
+ * this extent, we calculate a buffered extent (e.g. based on stroke width).
+ * @return {ol.Extent} The buffered rendering extent.
+ * @protected
+ */
+ol.render.canvas.Replay.prototype.getBufferedMaxExtent = function() {
+  return this.maxExtent;
+};
+
+
+
+/**
+ * @constructor
+ * @extends {ol.render.canvas.Replay}
+ * @param {number} tolerance Tolerance.
+ * @param {ol.Extent} maxExtent Maximum extent.
+ * @param {number} resolution Resolution.
+ * @protected
+ * @struct
+ */
+ol.render.canvas.ImageReplay = function(tolerance, maxExtent, resolution) {
+  goog.base(this, tolerance, maxExtent, resolution);
+
+  /**
+   * @private
+   * @type {HTMLCanvasElement|HTMLVideoElement|Image}
+   */
+  this.hitDetectionImage_ = null;
+
+  /**
+   * @private
+   * @type {HTMLCanvasElement|HTMLVideoElement|Image}
+   */
+  this.image_ = null;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.anchorX_ = undefined;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.anchorY_ = undefined;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.height_ = undefined;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.opacity_ = undefined;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.originX_ = undefined;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.originY_ = undefined;
+
+  /**
+   * @private
+   * @type {boolean|undefined}
+   */
+  this.rotateWithView_ = undefined;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.rotation_ = undefined;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.scale_ = undefined;
+
+  /**
+   * @private
+   * @type {boolean|undefined}
+   */
+  this.snapToPixel_ = undefined;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.width_ = undefined;
+
+};
+goog.inherits(ol.render.canvas.ImageReplay, ol.render.canvas.Replay);
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @private
+ * @return {number} My end.
+ */
+ol.render.canvas.ImageReplay.prototype.drawCoordinates_ =
+    function(flatCoordinates, offset, end, stride) {
+  return this.appendFlatCoordinates(
+      flatCoordinates, offset, end, stride, false);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.ImageReplay.prototype.drawPointGeometry =
+    function(pointGeometry, feature) {
+  if (!this.image_) {
+    return;
+  }
+  goog.asserts.assert(this.anchorX_ !== undefined,
+      'this.anchorX_ should be defined');
+  goog.asserts.assert(this.anchorY_ !== undefined,
+      'this.anchorY_ should be defined');
+  goog.asserts.assert(this.height_ !== undefined,
+      'this.height_ should be defined');
+  goog.asserts.assert(this.opacity_ !== undefined,
+      'this.opacity_ should be defined');
+  goog.asserts.assert(this.originX_ !== undefined,
+      'this.originX_ should be defined');
+  goog.asserts.assert(this.originY_ !== undefined,
+      'this.originY_ should be defined');
+  goog.asserts.assert(this.rotateWithView_ !== undefined,
+      'this.rotateWithView_ should be defined');
+  goog.asserts.assert(this.rotation_ !== undefined,
+      'this.rotation_ should be defined');
+  goog.asserts.assert(this.scale_ !== undefined,
+      'this.scale_ should be defined');
+  goog.asserts.assert(this.width_ !== undefined,
+      'this.width_ should be defined');
+  this.beginGeometry(pointGeometry, feature);
+  var flatCoordinates = pointGeometry.getFlatCoordinates();
+  var stride = pointGeometry.getStride();
+  var myBegin = this.coordinates.length;
+  var myEnd = this.drawCoordinates_(
+      flatCoordinates, 0, flatCoordinates.length, stride);
+  this.instructions.push([
+    ol.render.canvas.Instruction.DRAW_IMAGE, myBegin, myEnd, this.image_,
+    // Remaining arguments to DRAW_IMAGE are in alphabetical order
+    this.anchorX_, this.anchorY_, this.height_, this.opacity_,
+    this.originX_, this.originY_, this.rotateWithView_, this.rotation_,
+    this.scale_, this.snapToPixel_, this.width_
+  ]);
+  this.hitDetectionInstructions.push([
+    ol.render.canvas.Instruction.DRAW_IMAGE, myBegin, myEnd,
+    this.hitDetectionImage_,
+    // Remaining arguments to DRAW_IMAGE are in alphabetical order
+    this.anchorX_, this.anchorY_, this.height_, this.opacity_,
+    this.originX_, this.originY_, this.rotateWithView_, this.rotation_,
+    this.scale_, this.snapToPixel_, this.width_
+  ]);
+  this.endGeometry(pointGeometry, feature);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.ImageReplay.prototype.drawMultiPointGeometry =
+    function(multiPointGeometry, feature) {
+  if (!this.image_) {
+    return;
+  }
+  goog.asserts.assert(this.anchorX_ !== undefined,
+      'this.anchorX_ should be defined');
+  goog.asserts.assert(this.anchorY_ !== undefined,
+      'this.anchorY_ should be defined');
+  goog.asserts.assert(this.height_ !== undefined,
+      'this.height_ should be defined');
+  goog.asserts.assert(this.opacity_ !== undefined,
+      'this.opacity_ should be defined');
+  goog.asserts.assert(this.originX_ !== undefined,
+      'this.originX_ should be defined');
+  goog.asserts.assert(this.originY_ !== undefined,
+      'this.originY_ should be defined');
+  goog.asserts.assert(this.rotateWithView_ !== undefined,
+      'this.rotateWithView_ should be defined');
+  goog.asserts.assert(this.rotation_ !== undefined,
+      'this.rotation_ should be defined');
+  goog.asserts.assert(this.scale_ !== undefined,
+      'this.scale_ should be defined');
+  goog.asserts.assert(this.width_ !== undefined,
+      'this.width_ should be defined');
+  this.beginGeometry(multiPointGeometry, feature);
+  var flatCoordinates = multiPointGeometry.getFlatCoordinates();
+  var stride = multiPointGeometry.getStride();
+  var myBegin = this.coordinates.length;
+  var myEnd = this.drawCoordinates_(
+      flatCoordinates, 0, flatCoordinates.length, stride);
+  this.instructions.push([
+    ol.render.canvas.Instruction.DRAW_IMAGE, myBegin, myEnd, this.image_,
+    // Remaining arguments to DRAW_IMAGE are in alphabetical order
+    this.anchorX_, this.anchorY_, this.height_, this.opacity_,
+    this.originX_, this.originY_, this.rotateWithView_, this.rotation_,
+    this.scale_, this.snapToPixel_, this.width_
+  ]);
+  this.hitDetectionInstructions.push([
+    ol.render.canvas.Instruction.DRAW_IMAGE, myBegin, myEnd,
+    this.hitDetectionImage_,
+    // Remaining arguments to DRAW_IMAGE are in alphabetical order
+    this.anchorX_, this.anchorY_, this.height_, this.opacity_,
+    this.originX_, this.originY_, this.rotateWithView_, this.rotation_,
+    this.scale_, this.snapToPixel_, this.width_
+  ]);
+  this.endGeometry(multiPointGeometry, feature);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.ImageReplay.prototype.finish = function() {
+  this.reverseHitDetectionInstructions_();
+  // FIXME this doesn't really protect us against further calls to draw*Geometry
+  this.anchorX_ = undefined;
+  this.anchorY_ = undefined;
+  this.hitDetectionImage_ = null;
+  this.image_ = null;
+  this.height_ = undefined;
+  this.scale_ = undefined;
+  this.opacity_ = undefined;
+  this.originX_ = undefined;
+  this.originY_ = undefined;
+  this.rotateWithView_ = undefined;
+  this.rotation_ = undefined;
+  this.snapToPixel_ = undefined;
+  this.width_ = undefined;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.ImageReplay.prototype.setImageStyle = function(imageStyle) {
+  goog.asserts.assert(imageStyle, 'imageStyle should not be null');
+  var anchor = imageStyle.getAnchor();
+  goog.asserts.assert(anchor, 'anchor should not be null');
+  var size = imageStyle.getSize();
+  goog.asserts.assert(size, 'size should not be null');
+  var hitDetectionImage = imageStyle.getHitDetectionImage(1);
+  goog.asserts.assert(hitDetectionImage,
+      'hitDetectionImage should not be null');
+  var image = imageStyle.getImage(1);
+  goog.asserts.assert(image, 'image should not be null');
+  var origin = imageStyle.getOrigin();
+  goog.asserts.assert(origin, 'origin should not be null');
+  this.anchorX_ = anchor[0];
+  this.anchorY_ = anchor[1];
+  this.hitDetectionImage_ = hitDetectionImage;
+  this.image_ = image;
+  this.height_ = size[1];
+  this.opacity_ = imageStyle.getOpacity();
+  this.originX_ = origin[0];
+  this.originY_ = origin[1];
+  this.rotateWithView_ = imageStyle.getRotateWithView();
+  this.rotation_ = imageStyle.getRotation();
+  this.scale_ = imageStyle.getScale();
+  this.snapToPixel_ = imageStyle.getSnapToPixel();
+  this.width_ = size[0];
+};
+
+
+
+/**
+ * @constructor
+ * @extends {ol.render.canvas.Replay}
+ * @param {number} tolerance Tolerance.
+ * @param {ol.Extent} maxExtent Maximum extent.
+ * @param {number} resolution Resolution.
+ * @protected
+ * @struct
+ */
+ol.render.canvas.LineStringReplay = function(tolerance, maxExtent, resolution) {
+
+  goog.base(this, tolerance, maxExtent, resolution);
+
+  /**
+   * @private
+   * @type {{currentStrokeStyle: (string|undefined),
+   *         currentLineCap: (string|undefined),
+   *         currentLineDash: Array.<number>,
+   *         currentLineJoin: (string|undefined),
+   *         currentLineWidth: (number|undefined),
+   *         currentMiterLimit: (number|undefined),
+   *         lastStroke: number,
+   *         strokeStyle: (string|undefined),
+   *         lineCap: (string|undefined),
+   *         lineDash: Array.<number>,
+   *         lineJoin: (string|undefined),
+   *         lineWidth: (number|undefined),
+   *         miterLimit: (number|undefined)}|null}
+   */
+  this.state_ = {
+    currentStrokeStyle: undefined,
+    currentLineCap: undefined,
+    currentLineDash: null,
+    currentLineJoin: undefined,
+    currentLineWidth: undefined,
+    currentMiterLimit: undefined,
+    lastStroke: 0,
+    strokeStyle: undefined,
+    lineCap: undefined,
+    lineDash: null,
+    lineJoin: undefined,
+    lineWidth: undefined,
+    miterLimit: undefined
+  };
+
+};
+goog.inherits(ol.render.canvas.LineStringReplay, ol.render.canvas.Replay);
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @private
+ * @return {number} end.
+ */
+ol.render.canvas.LineStringReplay.prototype.drawFlatCoordinates_ =
+    function(flatCoordinates, offset, end, stride) {
+  var myBegin = this.coordinates.length;
+  var myEnd = this.appendFlatCoordinates(
+      flatCoordinates, offset, end, stride, false);
+  var moveToLineToInstruction =
+      [ol.render.canvas.Instruction.MOVE_TO_LINE_TO, myBegin, myEnd];
+  this.instructions.push(moveToLineToInstruction);
+  this.hitDetectionInstructions.push(moveToLineToInstruction);
+  return end;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.LineStringReplay.prototype.getBufferedMaxExtent = function() {
+  if (!this.bufferedMaxExtent_) {
+    this.bufferedMaxExtent_ = ol.extent.clone(this.maxExtent);
+    if (this.maxLineWidth > 0) {
+      var width = this.resolution * (this.maxLineWidth + 1) / 2;
+      ol.extent.buffer(this.bufferedMaxExtent_, width, this.bufferedMaxExtent_);
+    }
+  }
+  return this.bufferedMaxExtent_;
+};
+
+
+/**
+ * @private
+ */
+ol.render.canvas.LineStringReplay.prototype.setStrokeStyle_ = function() {
+  var state = this.state_;
+  var strokeStyle = state.strokeStyle;
+  var lineCap = state.lineCap;
+  var lineDash = state.lineDash;
+  var lineJoin = state.lineJoin;
+  var lineWidth = state.lineWidth;
+  var miterLimit = state.miterLimit;
+  goog.asserts.assert(strokeStyle !== undefined,
+      'strokeStyle should be defined');
+  goog.asserts.assert(lineCap !== undefined, 'lineCap should be defined');
+  goog.asserts.assert(lineDash, 'lineDash should not be null');
+  goog.asserts.assert(lineJoin !== undefined, 'lineJoin should be defined');
+  goog.asserts.assert(lineWidth !== undefined, 'lineWidth should be defined');
+  goog.asserts.assert(miterLimit !== undefined, 'miterLimit should be defined');
+  if (state.currentStrokeStyle != strokeStyle ||
+      state.currentLineCap != lineCap ||
+      !goog.array.equals(state.currentLineDash, lineDash) ||
+      state.currentLineJoin != lineJoin ||
+      state.currentLineWidth != lineWidth ||
+      state.currentMiterLimit != miterLimit) {
+    if (state.lastStroke != this.coordinates.length) {
+      this.instructions.push(
+          [ol.render.canvas.Instruction.STROKE]);
+      state.lastStroke = this.coordinates.length;
+    }
+    this.instructions.push(
+        [ol.render.canvas.Instruction.SET_STROKE_STYLE,
+         strokeStyle, lineWidth, lineCap, lineJoin, miterLimit, lineDash],
+        [ol.render.canvas.Instruction.BEGIN_PATH]);
+    state.currentStrokeStyle = strokeStyle;
+    state.currentLineCap = lineCap;
+    state.currentLineDash = lineDash;
+    state.currentLineJoin = lineJoin;
+    state.currentLineWidth = lineWidth;
+    state.currentMiterLimit = miterLimit;
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.LineStringReplay.prototype.drawLineStringGeometry =
+    function(lineStringGeometry, feature) {
+  var state = this.state_;
+  goog.asserts.assert(state, 'state should not be null');
+  var strokeStyle = state.strokeStyle;
+  var lineWidth = state.lineWidth;
+  if (strokeStyle === undefined || lineWidth === undefined) {
+    return;
+  }
+  this.setStrokeStyle_();
+  this.beginGeometry(lineStringGeometry, feature);
+  this.hitDetectionInstructions.push(
+      [ol.render.canvas.Instruction.SET_STROKE_STYLE,
+       state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,
+       state.miterLimit, state.lineDash],
+      [ol.render.canvas.Instruction.BEGIN_PATH]);
+  var flatCoordinates = lineStringGeometry.getFlatCoordinates();
+  var stride = lineStringGeometry.getStride();
+  this.drawFlatCoordinates_(
+      flatCoordinates, 0, flatCoordinates.length, stride);
+  this.hitDetectionInstructions.push([ol.render.canvas.Instruction.STROKE]);
+  this.endGeometry(lineStringGeometry, feature);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.LineStringReplay.prototype.drawMultiLineStringGeometry =
+    function(multiLineStringGeometry, feature) {
+  var state = this.state_;
+  goog.asserts.assert(state, 'state should not be null');
+  var strokeStyle = state.strokeStyle;
+  var lineWidth = state.lineWidth;
+  if (strokeStyle === undefined || lineWidth === undefined) {
+    return;
+  }
+  this.setStrokeStyle_();
+  this.beginGeometry(multiLineStringGeometry, feature);
+  this.hitDetectionInstructions.push(
+      [ol.render.canvas.Instruction.SET_STROKE_STYLE,
+       state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,
+       state.miterLimit, state.lineDash],
+      [ol.render.canvas.Instruction.BEGIN_PATH]);
+  var ends = multiLineStringGeometry.getEnds();
+  var flatCoordinates = multiLineStringGeometry.getFlatCoordinates();
+  var stride = multiLineStringGeometry.getStride();
+  var offset = 0;
+  var i, ii;
+  for (i = 0, ii = ends.length; i < ii; ++i) {
+    offset = this.drawFlatCoordinates_(
+        flatCoordinates, offset, ends[i], stride);
+  }
+  this.hitDetectionInstructions.push([ol.render.canvas.Instruction.STROKE]);
+  this.endGeometry(multiLineStringGeometry, feature);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.LineStringReplay.prototype.finish = function() {
+  var state = this.state_;
+  goog.asserts.assert(state, 'state should not be null');
+  if (state.lastStroke != this.coordinates.length) {
+    this.instructions.push([ol.render.canvas.Instruction.STROKE]);
+  }
+  this.reverseHitDetectionInstructions_();
+  this.state_ = null;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.LineStringReplay.prototype.setFillStrokeStyle =
+    function(fillStyle, strokeStyle) {
+  goog.asserts.assert(this.state_, 'this.state_ should not be null');
+  goog.asserts.assert(!fillStyle, 'fillStyle should be null');
+  goog.asserts.assert(strokeStyle, 'strokeStyle should not be null');
+  var strokeStyleColor = strokeStyle.getColor();
+  this.state_.strokeStyle = ol.color.asString(strokeStyleColor ?
+      strokeStyleColor : ol.render.canvas.defaultStrokeStyle);
+  var strokeStyleLineCap = strokeStyle.getLineCap();
+  this.state_.lineCap = strokeStyleLineCap !== undefined ?
+      strokeStyleLineCap : ol.render.canvas.defaultLineCap;
+  var strokeStyleLineDash = strokeStyle.getLineDash();
+  this.state_.lineDash = strokeStyleLineDash ?
+      strokeStyleLineDash : ol.render.canvas.defaultLineDash;
+  var strokeStyleLineJoin = strokeStyle.getLineJoin();
+  this.state_.lineJoin = strokeStyleLineJoin !== undefined ?
+      strokeStyleLineJoin : ol.render.canvas.defaultLineJoin;
+  var strokeStyleWidth = strokeStyle.getWidth();
+  this.state_.lineWidth = strokeStyleWidth !== undefined ?
+      strokeStyleWidth : ol.render.canvas.defaultLineWidth;
+  var strokeStyleMiterLimit = strokeStyle.getMiterLimit();
+  this.state_.miterLimit = strokeStyleMiterLimit !== undefined ?
+      strokeStyleMiterLimit : ol.render.canvas.defaultMiterLimit;
+
+  if (this.state_.lineWidth > this.maxLineWidth) {
+    this.maxLineWidth = this.state_.lineWidth;
+    // invalidate the buffered max extent cache
+    this.bufferedMaxExtent_ = null;
+  }
+};
+
+
+
+/**
+ * @constructor
+ * @extends {ol.render.canvas.Replay}
+ * @param {number} tolerance Tolerance.
+ * @param {ol.Extent} maxExtent Maximum extent.
+ * @param {number} resolution Resolution.
+ * @protected
+ * @struct
+ */
+ol.render.canvas.PolygonReplay = function(tolerance, maxExtent, resolution) {
+
+  goog.base(this, tolerance, maxExtent, resolution);
+
+  /**
+   * @private
+   * @type {{currentFillStyle: (string|undefined),
+   *         currentStrokeStyle: (string|undefined),
+   *         currentLineCap: (string|undefined),
+   *         currentLineDash: Array.<number>,
+   *         currentLineJoin: (string|undefined),
+   *         currentLineWidth: (number|undefined),
+   *         currentMiterLimit: (number|undefined),
+   *         fillStyle: (string|undefined),
+   *         strokeStyle: (string|undefined),
+   *         lineCap: (string|undefined),
+   *         lineDash: Array.<number>,
+   *         lineJoin: (string|undefined),
+   *         lineWidth: (number|undefined),
+   *         miterLimit: (number|undefined)}|null}
+   */
+  this.state_ = {
+    currentFillStyle: undefined,
+    currentStrokeStyle: undefined,
+    currentLineCap: undefined,
+    currentLineDash: null,
+    currentLineJoin: undefined,
+    currentLineWidth: undefined,
+    currentMiterLimit: undefined,
+    fillStyle: undefined,
+    strokeStyle: undefined,
+    lineCap: undefined,
+    lineDash: null,
+    lineJoin: undefined,
+    lineWidth: undefined,
+    miterLimit: undefined
+  };
+
+};
+goog.inherits(ol.render.canvas.PolygonReplay, ol.render.canvas.Replay);
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<number>} ends Ends.
+ * @param {number} stride Stride.
+ * @private
+ * @return {number} End.
+ */
+ol.render.canvas.PolygonReplay.prototype.drawFlatCoordinatess_ =
+    function(flatCoordinates, offset, ends, stride) {
+  var state = this.state_;
+  var beginPathInstruction = [ol.render.canvas.Instruction.BEGIN_PATH];
+  this.instructions.push(beginPathInstruction);
+  this.hitDetectionInstructions.push(beginPathInstruction);
+  var i, ii;
+  for (i = 0, ii = ends.length; i < ii; ++i) {
+    var end = ends[i];
+    var myBegin = this.coordinates.length;
+    var myEnd = this.appendFlatCoordinates(
+        flatCoordinates, offset, end, stride, true);
+    var moveToLineToInstruction =
+        [ol.render.canvas.Instruction.MOVE_TO_LINE_TO, myBegin, myEnd];
+    var closePathInstruction = [ol.render.canvas.Instruction.CLOSE_PATH];
+    this.instructions.push(moveToLineToInstruction, closePathInstruction);
+    this.hitDetectionInstructions.push(moveToLineToInstruction,
+        closePathInstruction);
+    offset = end;
+  }
+  // FIXME is it quicker to fill and stroke each polygon individually,
+  // FIXME or all polygons together?
+  var fillInstruction = [ol.render.canvas.Instruction.FILL];
+  this.hitDetectionInstructions.push(fillInstruction);
+  if (state.fillStyle !== undefined) {
+    this.instructions.push(fillInstruction);
+  }
+  if (state.strokeStyle !== undefined) {
+    goog.asserts.assert(state.lineWidth !== undefined,
+        'state.lineWidth should be defined');
+    var strokeInstruction = [ol.render.canvas.Instruction.STROKE];
+    this.instructions.push(strokeInstruction);
+    this.hitDetectionInstructions.push(strokeInstruction);
+  }
+  return offset;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.PolygonReplay.prototype.drawCircleGeometry =
+    function(circleGeometry, feature) {
+  var state = this.state_;
+  goog.asserts.assert(state, 'state should not be null');
+  var fillStyle = state.fillStyle;
+  var strokeStyle = state.strokeStyle;
+  if (fillStyle === undefined && strokeStyle === undefined) {
+    return;
+  }
+  if (strokeStyle !== undefined) {
+    goog.asserts.assert(state.lineWidth !== undefined,
+        'state.lineWidth should be defined');
+  }
+  this.setFillStrokeStyles_();
+  this.beginGeometry(circleGeometry, feature);
+  // always fill the circle for hit detection
+  this.hitDetectionInstructions.push(
+      [ol.render.canvas.Instruction.SET_FILL_STYLE,
+       ol.color.asString(ol.render.canvas.defaultFillStyle)]);
+  if (state.strokeStyle !== undefined) {
+    this.hitDetectionInstructions.push(
+        [ol.render.canvas.Instruction.SET_STROKE_STYLE,
+         state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,
+         state.miterLimit, state.lineDash]);
+  }
+  var flatCoordinates = circleGeometry.getFlatCoordinates();
+  var stride = circleGeometry.getStride();
+  var myBegin = this.coordinates.length;
+  this.appendFlatCoordinates(
+      flatCoordinates, 0, flatCoordinates.length, stride, false);
+  var beginPathInstruction = [ol.render.canvas.Instruction.BEGIN_PATH];
+  var circleInstruction = [ol.render.canvas.Instruction.CIRCLE, myBegin];
+  this.instructions.push(beginPathInstruction, circleInstruction);
+  this.hitDetectionInstructions.push(beginPathInstruction, circleInstruction);
+  var fillInstruction = [ol.render.canvas.Instruction.FILL];
+  this.hitDetectionInstructions.push(fillInstruction);
+  if (state.fillStyle !== undefined) {
+    this.instructions.push(fillInstruction);
+  }
+  if (state.strokeStyle !== undefined) {
+    goog.asserts.assert(state.lineWidth !== undefined,
+        'state.lineWidth should be defined');
+    var strokeInstruction = [ol.render.canvas.Instruction.STROKE];
+    this.instructions.push(strokeInstruction);
+    this.hitDetectionInstructions.push(strokeInstruction);
+  }
+  this.endGeometry(circleGeometry, feature);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.PolygonReplay.prototype.drawPolygonGeometry =
+    function(polygonGeometry, feature) {
+  var state = this.state_;
+  goog.asserts.assert(state, 'state should not be null');
+  var fillStyle = state.fillStyle;
+  var strokeStyle = state.strokeStyle;
+  if (fillStyle === undefined && strokeStyle === undefined) {
+    return;
+  }
+  if (strokeStyle !== undefined) {
+    goog.asserts.assert(state.lineWidth !== undefined,
+        'state.lineWidth should be defined');
+  }
+  this.setFillStrokeStyles_();
+  this.beginGeometry(polygonGeometry, feature);
+  // always fill the polygon for hit detection
+  this.hitDetectionInstructions.push(
+      [ol.render.canvas.Instruction.SET_FILL_STYLE,
+       ol.color.asString(ol.render.canvas.defaultFillStyle)]);
+  if (state.strokeStyle !== undefined) {
+    this.hitDetectionInstructions.push(
+        [ol.render.canvas.Instruction.SET_STROKE_STYLE,
+         state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,
+         state.miterLimit, state.lineDash]);
+  }
+  var ends = polygonGeometry.getEnds();
+  var flatCoordinates = polygonGeometry.getOrientedFlatCoordinates();
+  var stride = polygonGeometry.getStride();
+  this.drawFlatCoordinatess_(flatCoordinates, 0, ends, stride);
+  this.endGeometry(polygonGeometry, feature);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.PolygonReplay.prototype.drawMultiPolygonGeometry =
+    function(multiPolygonGeometry, feature) {
+  var state = this.state_;
+  goog.asserts.assert(state, 'state should not be null');
+  var fillStyle = state.fillStyle;
+  var strokeStyle = state.strokeStyle;
+  if (fillStyle === undefined && strokeStyle === undefined) {
+    return;
+  }
+  if (strokeStyle !== undefined) {
+    goog.asserts.assert(state.lineWidth !== undefined,
+        'state.lineWidth should be defined');
+  }
+  this.setFillStrokeStyles_();
+  this.beginGeometry(multiPolygonGeometry, feature);
+  // always fill the multi-polygon for hit detection
+  this.hitDetectionInstructions.push(
+      [ol.render.canvas.Instruction.SET_FILL_STYLE,
+       ol.color.asString(ol.render.canvas.defaultFillStyle)]);
+  if (state.strokeStyle !== undefined) {
+    this.hitDetectionInstructions.push(
+        [ol.render.canvas.Instruction.SET_STROKE_STYLE,
+         state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,
+         state.miterLimit, state.lineDash]);
+  }
+  var endss = multiPolygonGeometry.getEndss();
+  var flatCoordinates = multiPolygonGeometry.getOrientedFlatCoordinates();
+  var stride = multiPolygonGeometry.getStride();
+  var offset = 0;
+  var i, ii;
+  for (i = 0, ii = endss.length; i < ii; ++i) {
+    offset = this.drawFlatCoordinatess_(
+        flatCoordinates, offset, endss[i], stride);
+  }
+  this.endGeometry(multiPolygonGeometry, feature);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.PolygonReplay.prototype.finish = function() {
+  goog.asserts.assert(this.state_, 'this.state_ should not be null');
+  this.reverseHitDetectionInstructions_();
+  this.state_ = null;
+  // We want to preserve topology when drawing polygons.  Polygons are
+  // simplified using quantization and point elimination. However, we might
+  // have received a mix of quantized and non-quantized geometries, so ensure
+  // that all are quantized by quantizing all coordinates in the batch.
+  var tolerance = this.tolerance;
+  if (tolerance !== 0) {
+    var coordinates = this.coordinates;
+    var i, ii;
+    for (i = 0, ii = coordinates.length; i < ii; ++i) {
+      coordinates[i] = ol.geom.flat.simplify.snap(coordinates[i], tolerance);
+    }
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.PolygonReplay.prototype.getBufferedMaxExtent = function() {
+  if (!this.bufferedMaxExtent_) {
+    this.bufferedMaxExtent_ = ol.extent.clone(this.maxExtent);
+    if (this.maxLineWidth > 0) {
+      var width = this.resolution * (this.maxLineWidth + 1) / 2;
+      ol.extent.buffer(this.bufferedMaxExtent_, width, this.bufferedMaxExtent_);
+    }
+  }
+  return this.bufferedMaxExtent_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.PolygonReplay.prototype.setFillStrokeStyle =
+    function(fillStyle, strokeStyle) {
+  goog.asserts.assert(this.state_, 'this.state_ should not be null');
+  goog.asserts.assert(fillStyle || strokeStyle,
+      'fillStyle or strokeStyle should not be null');
+  var state = this.state_;
+  if (fillStyle) {
+    var fillStyleColor = fillStyle.getColor();
+    state.fillStyle = ol.color.asString(fillStyleColor ?
+        fillStyleColor : ol.render.canvas.defaultFillStyle);
+  } else {
+    state.fillStyle = undefined;
+  }
+  if (strokeStyle) {
+    var strokeStyleColor = strokeStyle.getColor();
+    state.strokeStyle = ol.color.asString(strokeStyleColor ?
+        strokeStyleColor : ol.render.canvas.defaultStrokeStyle);
+    var strokeStyleLineCap = strokeStyle.getLineCap();
+    state.lineCap = strokeStyleLineCap !== undefined ?
+        strokeStyleLineCap : ol.render.canvas.defaultLineCap;
+    var strokeStyleLineDash = strokeStyle.getLineDash();
+    state.lineDash = strokeStyleLineDash ?
+        strokeStyleLineDash.slice() : ol.render.canvas.defaultLineDash;
+    var strokeStyleLineJoin = strokeStyle.getLineJoin();
+    state.lineJoin = strokeStyleLineJoin !== undefined ?
+        strokeStyleLineJoin : ol.render.canvas.defaultLineJoin;
+    var strokeStyleWidth = strokeStyle.getWidth();
+    state.lineWidth = strokeStyleWidth !== undefined ?
+        strokeStyleWidth : ol.render.canvas.defaultLineWidth;
+    var strokeStyleMiterLimit = strokeStyle.getMiterLimit();
+    state.miterLimit = strokeStyleMiterLimit !== undefined ?
+        strokeStyleMiterLimit : ol.render.canvas.defaultMiterLimit;
+
+    if (state.lineWidth > this.maxLineWidth) {
+      this.maxLineWidth = state.lineWidth;
+      // invalidate the buffered max extent cache
+      this.bufferedMaxExtent_ = null;
+    }
+  } else {
+    state.strokeStyle = undefined;
+    state.lineCap = undefined;
+    state.lineDash = null;
+    state.lineJoin = undefined;
+    state.lineWidth = undefined;
+    state.miterLimit = undefined;
+  }
+};
+
+
+/**
+ * @private
+ */
+ol.render.canvas.PolygonReplay.prototype.setFillStrokeStyles_ = function() {
+  var state = this.state_;
+  var fillStyle = state.fillStyle;
+  var strokeStyle = state.strokeStyle;
+  var lineCap = state.lineCap;
+  var lineDash = state.lineDash;
+  var lineJoin = state.lineJoin;
+  var lineWidth = state.lineWidth;
+  var miterLimit = state.miterLimit;
+  if (fillStyle !== undefined && state.currentFillStyle != fillStyle) {
+    this.instructions.push(
+        [ol.render.canvas.Instruction.SET_FILL_STYLE, fillStyle]);
+    state.currentFillStyle = state.fillStyle;
+  }
+  if (strokeStyle !== undefined) {
+    goog.asserts.assert(lineCap !== undefined, 'lineCap should be defined');
+    goog.asserts.assert(lineDash, 'lineDash should not be null');
+    goog.asserts.assert(lineJoin !== undefined, 'lineJoin should be defined');
+    goog.asserts.assert(lineWidth !== undefined, 'lineWidth should be defined');
+    goog.asserts.assert(miterLimit !== undefined,
+        'miterLimit should be defined');
+    if (state.currentStrokeStyle != strokeStyle ||
+        state.currentLineCap != lineCap ||
+        state.currentLineDash != lineDash ||
+        state.currentLineJoin != lineJoin ||
+        state.currentLineWidth != lineWidth ||
+        state.currentMiterLimit != miterLimit) {
+      this.instructions.push(
+          [ol.render.canvas.Instruction.SET_STROKE_STYLE,
+           strokeStyle, lineWidth, lineCap, lineJoin, miterLimit, lineDash]);
+      state.currentStrokeStyle = strokeStyle;
+      state.currentLineCap = lineCap;
+      state.currentLineDash = lineDash;
+      state.currentLineJoin = lineJoin;
+      state.currentLineWidth = lineWidth;
+      state.currentMiterLimit = miterLimit;
+    }
+  }
+};
+
+
+
+/**
+ * @constructor
+ * @extends {ol.render.canvas.Replay}
+ * @param {number} tolerance Tolerance.
+ * @param {ol.Extent} maxExtent Maximum extent.
+ * @param {number} resolution Resolution.
+ * @protected
+ * @struct
+ */
+ol.render.canvas.TextReplay = function(tolerance, maxExtent, resolution) {
+
+  goog.base(this, tolerance, maxExtent, resolution);
+
+  /**
+   * @private
+   * @type {?ol.render.canvas.FillState}
+   */
+  this.replayFillState_ = null;
+
+  /**
+   * @private
+   * @type {?ol.render.canvas.StrokeState}
+   */
+  this.replayStrokeState_ = null;
+
+  /**
+   * @private
+   * @type {?ol.render.canvas.TextState}
+   */
+  this.replayTextState_ = null;
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.text_ = '';
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.textOffsetX_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.textOffsetY_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.textRotation_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.textScale_ = 0;
+
+  /**
+   * @private
+   * @type {?ol.render.canvas.FillState}
+   */
+  this.textFillState_ = null;
+
+  /**
+   * @private
+   * @type {?ol.render.canvas.StrokeState}
+   */
+  this.textStrokeState_ = null;
+
+  /**
+   * @private
+   * @type {?ol.render.canvas.TextState}
+   */
+  this.textState_ = null;
+
+};
+goog.inherits(ol.render.canvas.TextReplay, ol.render.canvas.Replay);
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.TextReplay.prototype.drawText =
+    function(flatCoordinates, offset, end, stride, geometry, feature) {
+  if (this.text_ === '' || !this.textState_ ||
+      (!this.textFillState_ && !this.textStrokeState_)) {
+    return;
+  }
+  if (this.textFillState_) {
+    this.setReplayFillState_(this.textFillState_);
+  }
+  if (this.textStrokeState_) {
+    this.setReplayStrokeState_(this.textStrokeState_);
+  }
+  this.setReplayTextState_(this.textState_);
+  this.beginGeometry(geometry, feature);
+  var myBegin = this.coordinates.length;
+  var myEnd =
+      this.appendFlatCoordinates(flatCoordinates, offset, end, stride, false);
+  var fill = !!this.textFillState_;
+  var stroke = !!this.textStrokeState_;
+  var drawTextInstruction = [
+    ol.render.canvas.Instruction.DRAW_TEXT, myBegin, myEnd, this.text_,
+    this.textOffsetX_, this.textOffsetY_, this.textRotation_, this.textScale_,
+    fill, stroke];
+  this.instructions.push(drawTextInstruction);
+  this.hitDetectionInstructions.push(drawTextInstruction);
+  this.endGeometry(geometry, feature);
+};
+
+
+/**
+ * @param {ol.render.canvas.FillState} fillState Fill state.
+ * @private
+ */
+ol.render.canvas.TextReplay.prototype.setReplayFillState_ =
+    function(fillState) {
+  var replayFillState = this.replayFillState_;
+  if (replayFillState &&
+      replayFillState.fillStyle == fillState.fillStyle) {
+    return;
+  }
+  var setFillStyleInstruction =
+      [ol.render.canvas.Instruction.SET_FILL_STYLE, fillState.fillStyle];
+  this.instructions.push(setFillStyleInstruction);
+  this.hitDetectionInstructions.push(setFillStyleInstruction);
+  if (!replayFillState) {
+    this.replayFillState_ = {
+      fillStyle: fillState.fillStyle
+    };
+  } else {
+    replayFillState.fillStyle = fillState.fillStyle;
+  }
+};
+
+
+/**
+ * @param {ol.render.canvas.StrokeState} strokeState Stroke state.
+ * @private
+ */
+ol.render.canvas.TextReplay.prototype.setReplayStrokeState_ =
+    function(strokeState) {
+  var replayStrokeState = this.replayStrokeState_;
+  if (replayStrokeState &&
+      replayStrokeState.lineCap == strokeState.lineCap &&
+      replayStrokeState.lineDash == strokeState.lineDash &&
+      replayStrokeState.lineJoin == strokeState.lineJoin &&
+      replayStrokeState.lineWidth == strokeState.lineWidth &&
+      replayStrokeState.miterLimit == strokeState.miterLimit &&
+      replayStrokeState.strokeStyle == strokeState.strokeStyle) {
+    return;
+  }
+  var setStrokeStyleInstruction = [
+    ol.render.canvas.Instruction.SET_STROKE_STYLE, strokeState.strokeStyle,
+    strokeState.lineWidth, strokeState.lineCap, strokeState.lineJoin,
+    strokeState.miterLimit, strokeState.lineDash, false
+  ];
+  this.instructions.push(setStrokeStyleInstruction);
+  this.hitDetectionInstructions.push(setStrokeStyleInstruction);
+  if (!replayStrokeState) {
+    this.replayStrokeState_ = {
+      lineCap: strokeState.lineCap,
+      lineDash: strokeState.lineDash,
+      lineJoin: strokeState.lineJoin,
+      lineWidth: strokeState.lineWidth,
+      miterLimit: strokeState.miterLimit,
+      strokeStyle: strokeState.strokeStyle
+    };
+  } else {
+    replayStrokeState.lineCap = strokeState.lineCap;
+    replayStrokeState.lineDash = strokeState.lineDash;
+    replayStrokeState.lineJoin = strokeState.lineJoin;
+    replayStrokeState.lineWidth = strokeState.lineWidth;
+    replayStrokeState.miterLimit = strokeState.miterLimit;
+    replayStrokeState.strokeStyle = strokeState.strokeStyle;
+  }
+};
+
+
+/**
+ * @param {ol.render.canvas.TextState} textState Text state.
+ * @private
+ */
+ol.render.canvas.TextReplay.prototype.setReplayTextState_ =
+    function(textState) {
+  var replayTextState = this.replayTextState_;
+  if (replayTextState &&
+      replayTextState.font == textState.font &&
+      replayTextState.textAlign == textState.textAlign &&
+      replayTextState.textBaseline == textState.textBaseline) {
+    return;
+  }
+  var setTextStyleInstruction = [ol.render.canvas.Instruction.SET_TEXT_STYLE,
+    textState.font, textState.textAlign, textState.textBaseline];
+  this.instructions.push(setTextStyleInstruction);
+  this.hitDetectionInstructions.push(setTextStyleInstruction);
+  if (!replayTextState) {
+    this.replayTextState_ = {
+      font: textState.font,
+      textAlign: textState.textAlign,
+      textBaseline: textState.textBaseline
+    };
+  } else {
+    replayTextState.font = textState.font;
+    replayTextState.textAlign = textState.textAlign;
+    replayTextState.textBaseline = textState.textBaseline;
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.TextReplay.prototype.setTextStyle = function(textStyle) {
+  if (!textStyle) {
+    this.text_ = '';
+  } else {
+    var textFillStyle = textStyle.getFill();
+    if (!textFillStyle) {
+      this.textFillState_ = null;
+    } else {
+      var textFillStyleColor = textFillStyle.getColor();
+      var fillStyle = ol.color.asString(textFillStyleColor ?
+          textFillStyleColor : ol.render.canvas.defaultFillStyle);
+      if (!this.textFillState_) {
+        this.textFillState_ = {
+          fillStyle: fillStyle
+        };
+      } else {
+        var textFillState = this.textFillState_;
+        textFillState.fillStyle = fillStyle;
+      }
+    }
+    var textStrokeStyle = textStyle.getStroke();
+    if (!textStrokeStyle) {
+      this.textStrokeState_ = null;
+    } else {
+      var textStrokeStyleColor = textStrokeStyle.getColor();
+      var textStrokeStyleLineCap = textStrokeStyle.getLineCap();
+      var textStrokeStyleLineDash = textStrokeStyle.getLineDash();
+      var textStrokeStyleLineJoin = textStrokeStyle.getLineJoin();
+      var textStrokeStyleWidth = textStrokeStyle.getWidth();
+      var textStrokeStyleMiterLimit = textStrokeStyle.getMiterLimit();
+      var lineCap = textStrokeStyleLineCap !== undefined ?
+          textStrokeStyleLineCap : ol.render.canvas.defaultLineCap;
+      var lineDash = textStrokeStyleLineDash ?
+          textStrokeStyleLineDash.slice() : ol.render.canvas.defaultLineDash;
+      var lineJoin = textStrokeStyleLineJoin !== undefined ?
+          textStrokeStyleLineJoin : ol.render.canvas.defaultLineJoin;
+      var lineWidth = textStrokeStyleWidth !== undefined ?
+          textStrokeStyleWidth : ol.render.canvas.defaultLineWidth;
+      var miterLimit = textStrokeStyleMiterLimit !== undefined ?
+          textStrokeStyleMiterLimit : ol.render.canvas.defaultMiterLimit;
+      var strokeStyle = ol.color.asString(textStrokeStyleColor ?
+          textStrokeStyleColor : ol.render.canvas.defaultStrokeStyle);
+      if (!this.textStrokeState_) {
+        this.textStrokeState_ = {
+          lineCap: lineCap,
+          lineDash: lineDash,
+          lineJoin: lineJoin,
+          lineWidth: lineWidth,
+          miterLimit: miterLimit,
+          strokeStyle: strokeStyle
+        };
+      } else {
+        var textStrokeState = this.textStrokeState_;
+        textStrokeState.lineCap = lineCap;
+        textStrokeState.lineDash = lineDash;
+        textStrokeState.lineJoin = lineJoin;
+        textStrokeState.lineWidth = lineWidth;
+        textStrokeState.miterLimit = miterLimit;
+        textStrokeState.strokeStyle = strokeStyle;
+      }
+    }
+    var textFont = textStyle.getFont();
+    var textOffsetX = textStyle.getOffsetX();
+    var textOffsetY = textStyle.getOffsetY();
+    var textRotation = textStyle.getRotation();
+    var textScale = textStyle.getScale();
+    var textText = textStyle.getText();
+    var textTextAlign = textStyle.getTextAlign();
+    var textTextBaseline = textStyle.getTextBaseline();
+    var font = textFont !== undefined ?
+        textFont : ol.render.canvas.defaultFont;
+    var textAlign = textTextAlign !== undefined ?
+        textTextAlign : ol.render.canvas.defaultTextAlign;
+    var textBaseline = textTextBaseline !== undefined ?
+        textTextBaseline : ol.render.canvas.defaultTextBaseline;
+    if (!this.textState_) {
+      this.textState_ = {
+        font: font,
+        textAlign: textAlign,
+        textBaseline: textBaseline
+      };
+    } else {
+      var textState = this.textState_;
+      textState.font = font;
+      textState.textAlign = textAlign;
+      textState.textBaseline = textBaseline;
+    }
+    this.text_ = textText !== undefined ? textText : '';
+    this.textOffsetX_ = textOffsetX !== undefined ? textOffsetX : 0;
+    this.textOffsetY_ = textOffsetY !== undefined ? textOffsetY : 0;
+    this.textRotation_ = textRotation !== undefined ? textRotation : 0;
+    this.textScale_ = textScale !== undefined ? textScale : 1;
+  }
+};
+
+
+
+/**
+ * @constructor
+ * @implements {ol.render.IReplayGroup}
+ * @param {number} tolerance Tolerance.
+ * @param {ol.Extent} maxExtent Max extent.
+ * @param {number} resolution Resolution.
+ * @param {number=} opt_renderBuffer Optional rendering buffer.
+ * @struct
+ */
+ol.render.canvas.ReplayGroup = function(
+    tolerance, maxExtent, resolution, opt_renderBuffer) {
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.tolerance_ = tolerance;
+
+  /**
+   * @private
+   * @type {ol.Extent}
+   */
+  this.maxExtent_ = maxExtent;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.resolution_ = resolution;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.renderBuffer_ = opt_renderBuffer;
+
+  /**
+   * @private
+   * @type {!Object.<string,
+   *        Object.<ol.render.ReplayType, ol.render.canvas.Replay>>}
+   */
+  this.replaysByZIndex_ = {};
+
+  /**
+   * @private
+   * @type {CanvasRenderingContext2D}
+   */
+  this.hitDetectionContext_ = ol.dom.createCanvasContext2D(1, 1);
+
+  /**
+   * @private
+   * @type {!goog.vec.Mat4.Number}
+   */
+  this.hitDetectionTransform_ = goog.vec.Mat4.createNumber();
+
+};
+
+
+/**
+ * FIXME empty description for jsdoc
+ */
+ol.render.canvas.ReplayGroup.prototype.finish = function() {
+  var zKey;
+  for (zKey in this.replaysByZIndex_) {
+    var replays = this.replaysByZIndex_[zKey];
+    var replayKey;
+    for (replayKey in replays) {
+      replays[replayKey].finish();
+    }
+  }
+};
+
+
+/**
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {number} resolution Resolution.
+ * @param {number} rotation Rotation.
+ * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
+ *     to skip.
+ * @param {function((ol.Feature|ol.render.Feature)): T} callback Feature
+ *     callback.
+ * @return {T|undefined} Callback result.
+ * @template T
+ */
+ol.render.canvas.ReplayGroup.prototype.forEachFeatureAtCoordinate = function(
+    coordinate, resolution, rotation, skippedFeaturesHash, callback) {
+
+  var transform = this.hitDetectionTransform_;
+  ol.vec.Mat4.makeTransform2D(transform, 0.5, 0.5,
+      1 / resolution, -1 / resolution, -rotation,
+      -coordinate[0], -coordinate[1]);
+
+  var context = this.hitDetectionContext_;
+  context.clearRect(0, 0, 1, 1);
+
+  /**
+   * @type {ol.Extent}
+   */
+  var hitExtent;
+  if (this.renderBuffer_ !== undefined) {
+    hitExtent = ol.extent.createEmpty();
+    ol.extent.extendCoordinate(hitExtent, coordinate);
+    ol.extent.buffer(hitExtent, resolution * this.renderBuffer_, hitExtent);
+  }
+
+  return this.replayHitDetection_(context, transform, rotation,
+      skippedFeaturesHash,
+      /**
+       * @param {ol.Feature|ol.render.Feature} feature Feature.
+       * @return {?} Callback result.
+       */
+      function(feature) {
+        var imageData = context.getImageData(0, 0, 1, 1).data;
+        if (imageData[3] > 0) {
+          var result = callback(feature);
+          if (result) {
+            return result;
+          }
+          context.clearRect(0, 0, 1, 1);
+        }
+      }, hitExtent);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.ReplayGroup.prototype.getReplay =
+    function(zIndex, replayType) {
+  var zIndexKey = zIndex !== undefined ? zIndex.toString() : '0';
+  var replays = this.replaysByZIndex_[zIndexKey];
+  if (replays === undefined) {
+    replays = {};
+    this.replaysByZIndex_[zIndexKey] = replays;
+  }
+  var replay = replays[replayType];
+  if (replay === undefined) {
+    var Constructor = ol.render.canvas.BATCH_CONSTRUCTORS_[replayType];
+    goog.asserts.assert(Constructor !== undefined,
+        replayType +
+        ' constructor missing from ol.render.canvas.BATCH_CONSTRUCTORS_');
+    replay = new Constructor(this.tolerance_, this.maxExtent_,
+        this.resolution_);
+    replays[replayType] = replay;
+  }
+  return replay;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.canvas.ReplayGroup.prototype.isEmpty = function() {
+  return goog.object.isEmpty(this.replaysByZIndex_);
+};
+
+
+/**
+ * @param {CanvasRenderingContext2D} context Context.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {goog.vec.Mat4.Number} transform Transform.
+ * @param {number} viewRotation View rotation.
+ * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
+ *     to skip.
+ */
+ol.render.canvas.ReplayGroup.prototype.replay = function(
+    context, pixelRatio, transform, viewRotation, skippedFeaturesHash) {
+
+  /** @type {Array.<number>} */
+  var zs = Object.keys(this.replaysByZIndex_).map(Number);
+  zs.sort(ol.array.numberSafeCompareFunction);
+
+  // setup clipping so that the parts of over-simplified geometries are not
+  // visible outside the current extent when panning
+  var maxExtent = this.maxExtent_;
+  var minX = maxExtent[0];
+  var minY = maxExtent[1];
+  var maxX = maxExtent[2];
+  var maxY = maxExtent[3];
+  var flatClipCoords = [minX, minY, minX, maxY, maxX, maxY, maxX, minY];
+  ol.geom.flat.transform.transform2D(
+      flatClipCoords, 0, 8, 2, transform, flatClipCoords);
+  context.save();
+  context.beginPath();
+  context.moveTo(flatClipCoords[0], flatClipCoords[1]);
+  context.lineTo(flatClipCoords[2], flatClipCoords[3]);
+  context.lineTo(flatClipCoords[4], flatClipCoords[5]);
+  context.lineTo(flatClipCoords[6], flatClipCoords[7]);
+  context.closePath();
+  context.clip();
+
+  var i, ii, j, jj, replays, replay;
+  for (i = 0, ii = zs.length; i < ii; ++i) {
+    replays = this.replaysByZIndex_[zs[i].toString()];
+    for (j = 0, jj = ol.render.REPLAY_ORDER.length; j < jj; ++j) {
+      replay = replays[ol.render.REPLAY_ORDER[j]];
+      if (replay !== undefined) {
+        replay.replay(context, pixelRatio, transform, viewRotation,
+            skippedFeaturesHash);
+      }
+    }
+  }
+
+  context.restore();
+};
+
+
+/**
+ * @private
+ * @param {CanvasRenderingContext2D} context Context.
+ * @param {goog.vec.Mat4.Number} transform Transform.
+ * @param {number} viewRotation View rotation.
+ * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
+ *     to skip.
+ * @param {function((ol.Feature|ol.render.Feature)): T} featureCallback
+ *     Feature callback.
+ * @param {ol.Extent=} opt_hitExtent Only check features that intersect this
+ *     extent.
+ * @return {T|undefined} Callback result.
+ * @template T
+ */
+ol.render.canvas.ReplayGroup.prototype.replayHitDetection_ = function(
+    context, transform, viewRotation, skippedFeaturesHash,
+    featureCallback, opt_hitExtent) {
+  /** @type {Array.<number>} */
+  var zs = Object.keys(this.replaysByZIndex_).map(Number);
+  zs.sort(function(a, b) { return b - a; });
+
+  var i, ii, j, replays, replay, result;
+  for (i = 0, ii = zs.length; i < ii; ++i) {
+    replays = this.replaysByZIndex_[zs[i].toString()];
+    for (j = ol.render.REPLAY_ORDER.length - 1; j >= 0; --j) {
+      replay = replays[ol.render.REPLAY_ORDER[j]];
+      if (replay !== undefined) {
+        result = replay.replayHitDetection(context, transform, viewRotation,
+            skippedFeaturesHash, featureCallback, opt_hitExtent);
+        if (result) {
+          return result;
+        }
+      }
+    }
+  }
+  return undefined;
+};
+
+
+/**
+ * @const
+ * @private
+ * @type {Object.<ol.render.ReplayType,
+ *                function(new: ol.render.canvas.Replay, number, ol.Extent,
+ *                number)>}
+ */
+ol.render.canvas.BATCH_CONSTRUCTORS_ = {
+  'Image': ol.render.canvas.ImageReplay,
+  'LineString': ol.render.canvas.LineStringReplay,
+  'Polygon': ol.render.canvas.PolygonReplay,
+  'Text': ol.render.canvas.TextReplay
+};
+
+goog.provide('ol.render.Feature');
+
+
+goog.require('goog.asserts');
+goog.require('ol.extent');
+goog.require('ol.geom.GeometryType');
+
+
+
+/**
+ * Lightweight, read-only, {@link ol.Feature} and {@link ol.geom.Geometry} like
+ * structure, optimized for rendering and styling. Geometry access through the
+ * API is limited to getting the type and extent of the geometry.
+ *
+ * @constructor
+ * @param {ol.geom.GeometryType} type Geometry type.
+ * @param {Array.<number>} flatCoordinates Flat coordinates. These always need
+ *     to be right-handed for polygons.
+ * @param {Array.<number>|Array.<Array.<number>>} ends Ends or Endss.
+ * @param {Object.<string, *>} properties Properties.
+ */
+ol.render.Feature = function(type, flatCoordinates, ends, properties) {
+
+  /**
+   * @private
+   * @type {ol.Extent|undefined}
+   */
+  this.extent_;
+
+  goog.asserts.assert(type === ol.geom.GeometryType.POINT ||
+      type === ol.geom.GeometryType.MULTI_POINT ||
+      type === ol.geom.GeometryType.LINE_STRING ||
+      type === ol.geom.GeometryType.MULTI_LINE_STRING ||
+      type === ol.geom.GeometryType.POLYGON,
+      'Need a Point, MultiPoint, LineString, MultiLineString or Polygon type');
+
+  /**
+   * @private
+   * @type {ol.geom.GeometryType}
+   */
+  this.type_ = type;
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.flatCoordinates_ = flatCoordinates;
+
+  /**
+   * @private
+   * @type {Array.<number>|Array.<Array.<number>>}
+   */
+  this.ends_ = ends;
+
+  /**
+   * @private
+   * @type {Object.<string, *>}
+   */
+  this.properties_ = properties;
+
+};
+
+
+/**
+ * Get a feature property by its key.
+ * @param {string} key Key
+ * @return {*} Value for the requested key.
+ * @api
+ */
+ol.render.Feature.prototype.get = function(key) {
+  return this.properties_[key];
+};
+
+
+/**
+ * @return {Array.<number>|Array.<Array.<number>>} Ends or endss.
+ */
+ol.render.Feature.prototype.getEnds = function() {
+  return this.ends_;
+};
+
+
+/**
+ * Get the extent of this feature's geometry.
+ * @return {ol.Extent} Extent.
+ * @api
+ */
+ol.render.Feature.prototype.getExtent = function() {
+  if (!this.extent_) {
+    this.extent_ = this.type_ === ol.geom.GeometryType.POINT ?
+        ol.extent.createOrUpdateFromCoordinate(this.flatCoordinates_) :
+        ol.extent.createOrUpdateFromFlatCoordinates(
+            this.flatCoordinates_, 0, this.flatCoordinates_.length, 2);
+
+  }
+  return this.extent_;
+};
+
+
+/**
+ * @return {Array.<number>} Flat coordinates.
+ */
+ol.render.Feature.prototype.getFlatCoordinates =
+    ol.render.Feature.prototype.getOrientedFlatCoordinates = function() {
+  return this.flatCoordinates_;
+};
+
+
+/**
+ * Get the feature for working with its geometry.
+ * @return {ol.render.Feature} Feature.
+ * @api
+ */
+ol.render.Feature.prototype.getGeometry = function() {
+  return this;
+};
+
+
+/**
+ * Get the feature properties.
+ * @return {Object.<string, *>} Feature properties.
+ * @api
+ */
+ol.render.Feature.prototype.getProperties = function() {
+  return this.properties_;
+};
+
+
+/**
+ * Get the feature for working with its geometry.
+ * @return {ol.render.Feature} Feature.
+ */
+ol.render.Feature.prototype.getSimplifiedGeometry =
+    ol.render.Feature.prototype.getGeometry;
+
+
+/**
+ * @return {number} Stride.
+ */
+ol.render.Feature.prototype.getStride = function() {
+  return 2;
+};
+
+
+/**
+ * @return {undefined}
+ */
+ol.render.Feature.prototype.getStyleFunction = ol.nullFunction;
+
+
+/**
+ * Get the type of this feature's geometry.
+ * @return {ol.geom.GeometryType} Geometry type.
+ * @api
+ */
+ol.render.Feature.prototype.getType = function() {
+  return this.type_;
+};
+
+goog.provide('ol.renderer.vector');
+
+goog.require('goog.asserts');
+goog.require('ol.render.Feature');
+goog.require('ol.render.IReplayGroup');
+goog.require('ol.style.ImageState');
+goog.require('ol.style.Style');
+
+
+/**
+ * @param {ol.Feature|ol.render.Feature} feature1 Feature 1.
+ * @param {ol.Feature|ol.render.Feature} feature2 Feature 2.
+ * @return {number} Order.
+ */
+ol.renderer.vector.defaultOrder = function(feature1, feature2) {
+  return goog.getUid(feature1) - goog.getUid(feature2);
+};
+
+
+/**
+ * @param {number} resolution Resolution.
+ * @param {number} pixelRatio Pixel ratio.
+ * @return {number} Squared pixel tolerance.
+ */
+ol.renderer.vector.getSquaredTolerance = function(resolution, pixelRatio) {
+  var tolerance = ol.renderer.vector.getTolerance(resolution, pixelRatio);
+  return tolerance * tolerance;
+};
+
+
+/**
+ * @param {number} resolution Resolution.
+ * @param {number} pixelRatio Pixel ratio.
+ * @return {number} Pixel tolerance.
+ */
+ol.renderer.vector.getTolerance = function(resolution, pixelRatio) {
+  return ol.SIMPLIFY_TOLERANCE * resolution / pixelRatio;
+};
+
+
+/**
+ * @param {ol.render.IReplayGroup} replayGroup Replay group.
+ * @param {ol.geom.Circle} geometry Geometry.
+ * @param {ol.style.Style} style Style.
+ * @param {ol.Feature} feature Feature.
+ * @private
+ */
+ol.renderer.vector.renderCircleGeometry_ =
+    function(replayGroup, geometry, style, feature) {
+  var fillStyle = style.getFill();
+  var strokeStyle = style.getStroke();
+  if (fillStyle || strokeStyle) {
+    var polygonReplay = replayGroup.getReplay(
+        style.getZIndex(), ol.render.ReplayType.POLYGON);
+    polygonReplay.setFillStrokeStyle(fillStyle, strokeStyle);
+    polygonReplay.drawCircleGeometry(geometry, feature);
+  }
+  var textStyle = style.getText();
+  if (textStyle) {
+    var textReplay = replayGroup.getReplay(
+        style.getZIndex(), ol.render.ReplayType.TEXT);
+    textReplay.setTextStyle(textStyle);
+    textReplay.drawText(geometry.getCenter(), 0, 2, 2, geometry, feature);
+  }
+};
+
+
+/**
+ * @param {ol.render.IReplayGroup} replayGroup Replay group.
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ * @param {ol.style.Style} style Style.
+ * @param {number} squaredTolerance Squared tolerance.
+ * @param {function(this: T, goog.events.Event)} listener Listener function.
+ * @param {T} thisArg Value to use as `this` when executing `listener`.
+ * @return {boolean} `true` if style is loading.
+ * @template T
+ */
+ol.renderer.vector.renderFeature = function(
+    replayGroup, feature, style, squaredTolerance, listener, thisArg) {
+  var loading = false;
+  var imageStyle, imageState;
+  imageStyle = style.getImage();
+  if (imageStyle) {
+    imageState = imageStyle.getImageState();
+    if (imageState == ol.style.ImageState.LOADED ||
+        imageState == ol.style.ImageState.ERROR) {
+      imageStyle.unlistenImageChange(listener, thisArg);
+    } else {
+      if (imageState == ol.style.ImageState.IDLE) {
+        imageStyle.load();
+      }
+      imageState = imageStyle.getImageState();
+      goog.asserts.assert(imageState == ol.style.ImageState.LOADING,
+          'imageState should be LOADING');
+      imageStyle.listenImageChange(listener, thisArg);
+      loading = true;
+    }
+  }
+  ol.renderer.vector.renderFeature_(replayGroup, feature, style,
+      squaredTolerance);
+  return loading;
+};
+
+
+/**
+ * @param {ol.render.IReplayGroup} replayGroup Replay group.
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ * @param {ol.style.Style} style Style.
+ * @param {number} squaredTolerance Squared tolerance.
+ * @private
+ */
+ol.renderer.vector.renderFeature_ = function(
+    replayGroup, feature, style, squaredTolerance) {
+  var geometry = style.getGeometryFunction()(feature);
+  if (!geometry) {
+    return;
+  }
+  var simplifiedGeometry = geometry.getSimplifiedGeometry(squaredTolerance);
+  var geometryRenderer =
+      ol.renderer.vector.GEOMETRY_RENDERERS_[simplifiedGeometry.getType()];
+  goog.asserts.assert(geometryRenderer !== undefined,
+      'geometryRenderer should be defined');
+  geometryRenderer(replayGroup, simplifiedGeometry, style, feature);
+};
+
+
+/**
+ * @param {ol.render.IReplayGroup} replayGroup Replay group.
+ * @param {ol.geom.GeometryCollection} geometry Geometry.
+ * @param {ol.style.Style} style Style.
+ * @param {ol.Feature} feature Feature.
+ * @private
+ */
+ol.renderer.vector.renderGeometryCollectionGeometry_ =
+    function(replayGroup, geometry, style, feature) {
+  var geometries = geometry.getGeometriesArray();
+  var i, ii;
+  for (i = 0, ii = geometries.length; i < ii; ++i) {
+    var geometryRenderer =
+        ol.renderer.vector.GEOMETRY_RENDERERS_[geometries[i].getType()];
+    goog.asserts.assert(geometryRenderer !== undefined,
+        'geometryRenderer should be defined');
+    geometryRenderer(replayGroup, geometries[i], style, feature);
+  }
+};
+
+
+/**
+ * @param {ol.render.IReplayGroup} replayGroup Replay group.
+ * @param {ol.geom.LineString|ol.render.Feature} geometry Geometry.
+ * @param {ol.style.Style} style Style.
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ * @private
+ */
+ol.renderer.vector.renderLineStringGeometry_ =
+    function(replayGroup, geometry, style, feature) {
+  var strokeStyle = style.getStroke();
+  if (strokeStyle) {
+    var lineStringReplay = replayGroup.getReplay(
+        style.getZIndex(), ol.render.ReplayType.LINE_STRING);
+    lineStringReplay.setFillStrokeStyle(null, strokeStyle);
+    lineStringReplay.drawLineStringGeometry(geometry, feature);
+  }
+  var textStyle = style.getText();
+  if (textStyle) {
+    var textReplay = replayGroup.getReplay(
+        style.getZIndex(), ol.render.ReplayType.TEXT);
+    textReplay.setTextStyle(textStyle);
+    textReplay.drawText(geometry.getFlatMidpoint(), 0, 2, 2, geometry, feature);
+  }
+};
+
+
+/**
+ * @param {ol.render.IReplayGroup} replayGroup Replay group.
+ * @param {ol.geom.MultiLineString|ol.render.Feature} geometry Geometry.
+ * @param {ol.style.Style} style Style.
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ * @private
+ */
+ol.renderer.vector.renderMultiLineStringGeometry_ =
+    function(replayGroup, geometry, style, feature) {
+  var strokeStyle = style.getStroke();
+  if (strokeStyle) {
+    var lineStringReplay = replayGroup.getReplay(
+        style.getZIndex(), ol.render.ReplayType.LINE_STRING);
+    lineStringReplay.setFillStrokeStyle(null, strokeStyle);
+    lineStringReplay.drawMultiLineStringGeometry(geometry, feature);
+  }
+  var textStyle = style.getText();
+  if (textStyle) {
+    var textReplay = replayGroup.getReplay(
+        style.getZIndex(), ol.render.ReplayType.TEXT);
+    textReplay.setTextStyle(textStyle);
+    var flatMidpointCoordinates = geometry.getFlatMidpoints();
+    textReplay.drawText(flatMidpointCoordinates, 0,
+        flatMidpointCoordinates.length, 2, geometry, feature);
+  }
+};
+
+
+/**
+ * @param {ol.render.IReplayGroup} replayGroup Replay group.
+ * @param {ol.geom.MultiPolygon} geometry Geometry.
+ * @param {ol.style.Style} style Style.
+ * @param {ol.Feature} feature Feature.
+ * @private
+ */
+ol.renderer.vector.renderMultiPolygonGeometry_ =
+    function(replayGroup, geometry, style, feature) {
+  var fillStyle = style.getFill();
+  var strokeStyle = style.getStroke();
+  if (strokeStyle || fillStyle) {
+    var polygonReplay = replayGroup.getReplay(
+        style.getZIndex(), ol.render.ReplayType.POLYGON);
+    polygonReplay.setFillStrokeStyle(fillStyle, strokeStyle);
+    polygonReplay.drawMultiPolygonGeometry(geometry, feature);
+  }
+  var textStyle = style.getText();
+  if (textStyle) {
+    var textReplay = replayGroup.getReplay(
+        style.getZIndex(), ol.render.ReplayType.TEXT);
+    textReplay.setTextStyle(textStyle);
+    var flatInteriorPointCoordinates = geometry.getFlatInteriorPoints();
+    textReplay.drawText(flatInteriorPointCoordinates, 0,
+        flatInteriorPointCoordinates.length, 2, geometry, feature);
+  }
+};
+
+
+/**
+ * @param {ol.render.IReplayGroup} replayGroup Replay group.
+ * @param {ol.geom.Point|ol.render.Feature} geometry Geometry.
+ * @param {ol.style.Style} style Style.
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ * @private
+ */
+ol.renderer.vector.renderPointGeometry_ =
+    function(replayGroup, geometry, style, feature) {
+  var imageStyle = style.getImage();
+  if (imageStyle) {
+    if (imageStyle.getImageState() != ol.style.ImageState.LOADED) {
+      return;
+    }
+    var imageReplay = replayGroup.getReplay(
+        style.getZIndex(), ol.render.ReplayType.IMAGE);
+    imageReplay.setImageStyle(imageStyle);
+    imageReplay.drawPointGeometry(geometry, feature);
+  }
+  var textStyle = style.getText();
+  if (textStyle) {
+    var textReplay = replayGroup.getReplay(
+        style.getZIndex(), ol.render.ReplayType.TEXT);
+    textReplay.setTextStyle(textStyle);
+    textReplay.drawText(geometry.getFlatCoordinates(), 0, 2, 2, geometry,
+        feature);
+  }
+};
+
+
+/**
+ * @param {ol.render.IReplayGroup} replayGroup Replay group.
+ * @param {ol.geom.MultiPoint|ol.render.Feature} geometry Geometry.
+ * @param {ol.style.Style} style Style.
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ * @private
+ */
+ol.renderer.vector.renderMultiPointGeometry_ =
+    function(replayGroup, geometry, style, feature) {
+  var imageStyle = style.getImage();
+  if (imageStyle) {
+    if (imageStyle.getImageState() != ol.style.ImageState.LOADED) {
+      return;
+    }
+    var imageReplay = replayGroup.getReplay(
+        style.getZIndex(), ol.render.ReplayType.IMAGE);
+    imageReplay.setImageStyle(imageStyle);
+    imageReplay.drawMultiPointGeometry(geometry, feature);
+  }
+  var textStyle = style.getText();
+  if (textStyle) {
+    var textReplay = replayGroup.getReplay(
+        style.getZIndex(), ol.render.ReplayType.TEXT);
+    textReplay.setTextStyle(textStyle);
+    var flatCoordinates = geometry.getFlatCoordinates();
+    textReplay.drawText(flatCoordinates, 0, flatCoordinates.length,
+        geometry.getStride(), geometry, feature);
+  }
+};
+
+
+/**
+ * @param {ol.render.IReplayGroup} replayGroup Replay group.
+ * @param {ol.geom.Polygon|ol.render.Feature} geometry Geometry.
+ * @param {ol.style.Style} style Style.
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ * @private
+ */
+ol.renderer.vector.renderPolygonGeometry_ =
+    function(replayGroup, geometry, style, feature) {
+  var fillStyle = style.getFill();
+  var strokeStyle = style.getStroke();
+  if (fillStyle || strokeStyle) {
+    var polygonReplay = replayGroup.getReplay(
+        style.getZIndex(), ol.render.ReplayType.POLYGON);
+    polygonReplay.setFillStrokeStyle(fillStyle, strokeStyle);
+    polygonReplay.drawPolygonGeometry(geometry, feature);
+  }
+  var textStyle = style.getText();
+  if (textStyle) {
+    var textReplay = replayGroup.getReplay(
+        style.getZIndex(), ol.render.ReplayType.TEXT);
+    textReplay.setTextStyle(textStyle);
+    textReplay.drawText(
+        geometry.getFlatInteriorPoint(), 0, 2, 2, geometry, feature);
+  }
+};
+
+
+/**
+ * @const
+ * @private
+ * @type {Object.<ol.geom.GeometryType,
+ *                function(ol.render.IReplayGroup, ol.geom.Geometry,
+ *                         ol.style.Style, Object)>}
+ */
+ol.renderer.vector.GEOMETRY_RENDERERS_ = {
+  'Point': ol.renderer.vector.renderPointGeometry_,
+  'LineString': ol.renderer.vector.renderLineStringGeometry_,
+  'Polygon': ol.renderer.vector.renderPolygonGeometry_,
+  'MultiPoint': ol.renderer.vector.renderMultiPointGeometry_,
+  'MultiLineString': ol.renderer.vector.renderMultiLineStringGeometry_,
+  'MultiPolygon': ol.renderer.vector.renderMultiPolygonGeometry_,
+  'GeometryCollection': ol.renderer.vector.renderGeometryCollectionGeometry_,
+  'Circle': ol.renderer.vector.renderCircleGeometry_
+};
+
+goog.provide('ol.ImageCanvas');
+
+goog.require('goog.asserts');
+goog.require('ol.ImageBase');
+goog.require('ol.ImageState');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.ImageBase}
+ * @param {ol.Extent} extent Extent.
+ * @param {number} resolution Resolution.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {Array.<ol.Attribution>} attributions Attributions.
+ * @param {HTMLCanvasElement} canvas Canvas.
+ * @param {ol.ImageCanvasLoader=} opt_loader Optional loader function to
+ *     support asynchronous canvas drawing.
+ */
+ol.ImageCanvas = function(extent, resolution, pixelRatio, attributions,
+    canvas, opt_loader) {
+
+  /**
+   * Optional canvas loader function.
+   * @type {?ol.ImageCanvasLoader}
+   * @private
+   */
+  this.loader_ = opt_loader !== undefined ? opt_loader : null;
+
+  var state = opt_loader !== undefined ?
+      ol.ImageState.IDLE : ol.ImageState.LOADED;
+
+  goog.base(this, extent, resolution, pixelRatio, state, attributions);
+
+  /**
+   * @private
+   * @type {HTMLCanvasElement}
+   */
+  this.canvas_ = canvas;
+
+  /**
+   * @private
+   * @type {Error}
+   */
+  this.error_ = null;
+
+};
+goog.inherits(ol.ImageCanvas, ol.ImageBase);
+
+
+/**
+ * Get any error associated with asynchronous rendering.
+ * @return {Error} Any error that occurred during rendering.
+ */
+ol.ImageCanvas.prototype.getError = function() {
+  return this.error_;
+};
+
+
+/**
+ * Handle async drawing complete.
+ * @param {Error} err Any error during drawing.
+ * @private
+ */
+ol.ImageCanvas.prototype.handleLoad_ = function(err) {
+  if (err) {
+    this.error_ = err;
+    this.state = ol.ImageState.ERROR;
+  } else {
+    this.state = ol.ImageState.LOADED;
+  }
+  this.changed();
+};
+
+
+/**
+ * Trigger drawing on canvas.
+ */
+ol.ImageCanvas.prototype.load = function() {
+  if (this.state == ol.ImageState.IDLE) {
+    goog.asserts.assert(this.loader_, 'this.loader_ must be set');
+    this.state = ol.ImageState.LOADING;
+    this.changed();
+    this.loader_(goog.bind(this.handleLoad_, this));
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.ImageCanvas.prototype.getImage = function(opt_context) {
+  return this.canvas_;
+};
+
+
+/**
+ * A function that is called to trigger asynchronous canvas drawing.  It is
+ * called with a "done" callback that should be called when drawing is done.
+ * If any error occurs during drawing, the "done" callback should be called with
+ * that error.
+ *
+ * @typedef {function(function(Error))}
+ */
+ol.ImageCanvasLoader;
+
+goog.provide('ol.reproj');
+
+goog.require('goog.labs.userAgent.browser');
+goog.require('goog.labs.userAgent.platform');
+goog.require('goog.math');
+goog.require('ol.dom');
+goog.require('ol.extent');
+goog.require('ol.math');
+goog.require('ol.proj');
+
+
+/**
+ * We need to employ more sophisticated solution
+ * if the web browser antialiases clipping edges on canvas.
+ *
+ * Currently only Chrome does not antialias the edges, but this is probably
+ * going to be "fixed" in the future: http://crbug.com/424291
+ *
+ * @type {boolean}
+ * @private
+ */
+ol.reproj.browserAntialiasesClip_ = !goog.labs.userAgent.browser.isChrome() ||
+                                    goog.labs.userAgent.platform.isIos();
+
+
+/**
+ * Calculates ideal resolution to use from the source in order to achieve
+ * pixel mapping as close as possible to 1:1 during reprojection.
+ * The resolution is calculated regardless of what resolutions
+ * are actually available in the dataset (TileGrid, Image, ...).
+ *
+ * @param {ol.proj.Projection} sourceProj Source projection.
+ * @param {ol.proj.Projection} targetProj Target projection.
+ * @param {ol.Coordinate} targetCenter Target center.
+ * @param {number} targetResolution Target resolution.
+ * @return {number} The best resolution to use. Can be +-Infinity, NaN or 0.
+ */
+ol.reproj.calculateSourceResolution = function(sourceProj, targetProj,
+    targetCenter, targetResolution) {
+
+  var sourceCenter = ol.proj.transform(targetCenter, targetProj, sourceProj);
+
+  // calculate the ideal resolution of the source data
+  var sourceResolution =
+      targetProj.getPointResolution(targetResolution, targetCenter);
+
+  var targetMetersPerUnit = targetProj.getMetersPerUnit();
+  if (targetMetersPerUnit !== undefined) {
+    sourceResolution *= targetMetersPerUnit;
+  }
+  var sourceMetersPerUnit = sourceProj.getMetersPerUnit();
+  if (sourceMetersPerUnit !== undefined) {
+    sourceResolution /= sourceMetersPerUnit;
+  }
+
+  // Based on the projection properties, the point resolution at the specified
+  // coordinates may be slightly different. We need to reverse-compensate this
+  // in order to achieve optimal results.
+
+  var compensationFactor =
+      sourceProj.getPointResolution(sourceResolution, sourceCenter) /
+      sourceResolution;
+
+  if (goog.math.isFiniteNumber(compensationFactor) && compensationFactor > 0) {
+    sourceResolution /= compensationFactor;
+  }
+
+  return sourceResolution;
+};
+
+
+/**
+ * Enlarge the clipping triangle point by 1 pixel to ensure the edges overlap
+ * in order to mask gaps caused by antialiasing.
+ *
+ * @param {number} centroidX Centroid of the triangle (x coordinate in pixels).
+ * @param {number} centroidY Centroid of the triangle (y coordinate in pixels).
+ * @param {number} x X coordinate of the point (in pixels).
+ * @param {number} y Y coordinate of the point (in pixels).
+ * @return {ol.Coordinate} New point 1 px farther from the centroid.
+ * @private
+ */
+ol.reproj.enlargeClipPoint_ = function(centroidX, centroidY, x, y) {
+  var dX = x - centroidX, dY = y - centroidY;
+  var distance = Math.sqrt(dX * dX + dY * dY);
+  return [Math.round(x + dX / distance), Math.round(y + dY / distance)];
+};
+
+
+/**
+ * Renders the source data into new canvas based on the triangulation.
+ *
+ * @param {number} width Width of the canvas.
+ * @param {number} height Height of the canvas.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {number} sourceResolution Source resolution.
+ * @param {ol.Extent} sourceExtent Extent of the data source.
+ * @param {number} targetResolution Target resolution.
+ * @param {ol.Extent} targetExtent Target extent.
+ * @param {ol.reproj.Triangulation} triangulation Calculated triangulation.
+ * @param {Array.<{extent: ol.Extent,
+ *                 image: (HTMLCanvasElement|Image|HTMLVideoElement)}>} sources
+ *             Array of sources.
+ * @param {boolean=} opt_renderEdges Render reprojection edges.
+ * @return {HTMLCanvasElement} Canvas with reprojected data.
+ */
+ol.reproj.render = function(width, height, pixelRatio,
+    sourceResolution, sourceExtent, targetResolution, targetExtent,
+    triangulation, sources, opt_renderEdges) {
+
+  var context = ol.dom.createCanvasContext2D(Math.round(pixelRatio * width),
+                                             Math.round(pixelRatio * height));
+
+  if (sources.length === 0) {
+    return context.canvas;
+  }
+
+  context.scale(pixelRatio, pixelRatio);
+
+  var sourceDataExtent = ol.extent.createEmpty();
+  sources.forEach(function(src, i, arr) {
+    ol.extent.extend(sourceDataExtent, src.extent);
+  });
+
+  var canvasWidthInUnits = ol.extent.getWidth(sourceDataExtent);
+  var canvasHeightInUnits = ol.extent.getHeight(sourceDataExtent);
+  var stitchContext = ol.dom.createCanvasContext2D(
+      Math.round(pixelRatio * canvasWidthInUnits / sourceResolution),
+      Math.round(pixelRatio * canvasHeightInUnits / sourceResolution));
+
+  stitchContext.scale(pixelRatio / sourceResolution,
+                      pixelRatio / sourceResolution);
+  stitchContext.translate(-sourceDataExtent[0], sourceDataExtent[3]);
+
+  sources.forEach(function(src, i, arr) {
+    var xPos = src.extent[0];
+    var yPos = -src.extent[3];
+    var srcWidth = ol.extent.getWidth(src.extent);
+    var srcHeight = ol.extent.getHeight(src.extent);
+
+    stitchContext.drawImage(src.image, xPos, yPos, srcWidth, srcHeight);
+  });
+
+  var targetTopLeft = ol.extent.getTopLeft(targetExtent);
+
+  triangulation.getTriangles().forEach(function(triangle, i, arr) {
+    /* Calculate affine transform (src -> dst)
+     * Resulting matrix can be used to transform coordinate
+     * from `sourceProjection` to destination pixels.
+     *
+     * To optimize number of context calls and increase numerical stability,
+     * we also do the following operations:
+     * trans(-topLeftExtentCorner), scale(1 / targetResolution), scale(1, -1)
+     * here before solving the linear system so [ui, vi] are pixel coordinates.
+     *
+     * Src points: xi, yi
+     * Dst points: ui, vi
+     * Affine coefficients: aij
+     *
+     * | x0 y0 1  0  0 0 |   |a00|   |u0|
+     * | x1 y1 1  0  0 0 |   |a01|   |u1|
+     * | x2 y2 1  0  0 0 | x |a02| = |u2|
+     * |  0  0 0 x0 y0 1 |   |a10|   |v0|
+     * |  0  0 0 x1 y1 1 |   |a11|   |v1|
+     * |  0  0 0 x2 y2 1 |   |a12|   |v2|
+     */
+    var source = triangle.source, target = triangle.target;
+    var x0 = source[0][0], y0 = source[0][1],
+        x1 = source[1][0], y1 = source[1][1],
+        x2 = source[2][0], y2 = source[2][1];
+    var u0 = (target[0][0] - targetTopLeft[0]) / targetResolution,
+        v0 = -(target[0][1] - targetTopLeft[1]) / targetResolution;
+    var u1 = (target[1][0] - targetTopLeft[0]) / targetResolution,
+        v1 = -(target[1][1] - targetTopLeft[1]) / targetResolution;
+    var u2 = (target[2][0] - targetTopLeft[0]) / targetResolution,
+        v2 = -(target[2][1] - targetTopLeft[1]) / targetResolution;
+
+    // Shift all the source points to improve numerical stability
+    // of all the subsequent calculations. The [x0, y0] is used here.
+    // This is also used to simplify the linear system.
+    var sourceNumericalShiftX = x0, sourceNumericalShiftY = y0;
+    x0 = 0;
+    y0 = 0;
+    x1 -= sourceNumericalShiftX;
+    y1 -= sourceNumericalShiftY;
+    x2 -= sourceNumericalShiftX;
+    y2 -= sourceNumericalShiftY;
+
+    var augmentedMatrix = [
+      [x1, y1, 0, 0, u1 - u0],
+      [x2, y2, 0, 0, u2 - u0],
+      [0, 0, x1, y1, v1 - v0],
+      [0, 0, x2, y2, v2 - v0]
+    ];
+    var affineCoefs = ol.math.solveLinearSystem(augmentedMatrix);
+    if (!affineCoefs) {
+      return;
+    }
+
+    context.save();
+    context.beginPath();
+    if (ol.reproj.browserAntialiasesClip_) {
+      var centroidX = (u0 + u1 + u2) / 3, centroidY = (v0 + v1 + v2) / 3;
+      var p0 = ol.reproj.enlargeClipPoint_(centroidX, centroidY, u0, v0);
+      var p1 = ol.reproj.enlargeClipPoint_(centroidX, centroidY, u1, v1);
+      var p2 = ol.reproj.enlargeClipPoint_(centroidX, centroidY, u2, v2);
+
+      context.moveTo(p0[0], p0[1]);
+      context.lineTo(p1[0], p1[1]);
+      context.lineTo(p2[0], p2[1]);
+    } else {
+      context.moveTo(u0, v0);
+      context.lineTo(u1, v1);
+      context.lineTo(u2, v2);
+    }
+    context.closePath();
+    context.clip();
+
+    context.transform(
+        affineCoefs[0], affineCoefs[2], affineCoefs[1], affineCoefs[3], u0, v0);
+
+    context.translate(sourceDataExtent[0] - sourceNumericalShiftX,
+                      sourceDataExtent[3] - sourceNumericalShiftY);
+
+    context.scale(sourceResolution / pixelRatio,
+                  -sourceResolution / pixelRatio);
+
+    context.drawImage(stitchContext.canvas, 0, 0);
+    context.restore();
+  });
+
+  if (opt_renderEdges) {
+    context.save();
+
+    context.strokeStyle = 'black';
+    context.lineWidth = 1;
+
+    triangulation.getTriangles().forEach(function(triangle, i, arr) {
+      var target = triangle.target;
+      var u0 = (target[0][0] - targetTopLeft[0]) / targetResolution,
+          v0 = -(target[0][1] - targetTopLeft[1]) / targetResolution;
+      var u1 = (target[1][0] - targetTopLeft[0]) / targetResolution,
+          v1 = -(target[1][1] - targetTopLeft[1]) / targetResolution;
+      var u2 = (target[2][0] - targetTopLeft[0]) / targetResolution,
+          v2 = -(target[2][1] - targetTopLeft[1]) / targetResolution;
+
+      context.beginPath();
+      context.moveTo(u0, v0);
+      context.lineTo(u1, v1);
+      context.lineTo(u2, v2);
+      context.closePath();
+      context.stroke();
+    });
+
+    context.restore();
+  }
+  return context.canvas;
+};
+
+goog.provide('ol.reproj.Triangulation');
+
+goog.require('goog.asserts');
+goog.require('goog.math');
+goog.require('ol.extent');
+goog.require('ol.proj');
+
+
+/**
+ * Single triangle; consists of 3 source points and 3 target points.
+ *
+ * @typedef {{source: Array.<ol.Coordinate>,
+ *            target: Array.<ol.Coordinate>}}
+ */
+ol.reproj.Triangle;
+
+
+
+/**
+ * @classdesc
+ * Class containing triangulation of the given target extent.
+ * Used for determining source data and the reprojection itself.
+ *
+ * @param {ol.proj.Projection} sourceProj Source projection.
+ * @param {ol.proj.Projection} targetProj Target projection.
+ * @param {ol.Extent} targetExtent Target extent to triangulate.
+ * @param {ol.Extent} maxSourceExtent Maximal source extent that can be used.
+ * @param {number} errorThreshold Acceptable error (in source units).
+ * @constructor
+ */
+ol.reproj.Triangulation = function(sourceProj, targetProj, targetExtent,
+    maxSourceExtent, errorThreshold) {
+
+  /**
+   * @type {ol.proj.Projection}
+   * @private
+   */
+  this.sourceProj_ = sourceProj;
+
+  /**
+   * @type {ol.proj.Projection}
+   * @private
+   */
+  this.targetProj_ = targetProj;
+
+  /** @type {!Object.<string, ol.Coordinate>} */
+  var transformInvCache = {};
+  var transformInv = ol.proj.getTransform(this.targetProj_, this.sourceProj_);
+
+  /**
+   * @param {ol.Coordinate} c
+   * @return {ol.Coordinate}
+   * @private
+   */
+  this.transformInv_ = function(c) {
+    var key = c[0] + '/' + c[1];
+    if (!transformInvCache[key]) {
+      transformInvCache[key] = transformInv(c);
+    }
+    return transformInvCache[key];
+  };
+
+  /**
+   * @type {ol.Extent}
+   * @private
+   */
+  this.maxSourceExtent_ = maxSourceExtent;
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.errorThresholdSquared_ = errorThreshold * errorThreshold;
+
+  /**
+   * @type {Array.<ol.reproj.Triangle>}
+   * @private
+   */
+  this.triangles_ = [];
+
+  /**
+   * Indicates that the triangulation crosses edge of the source projection.
+   * @type {boolean}
+   * @private
+   */
+  this.wrapsXInSource_ = false;
+
+  /**
+   * @type {boolean}
+   * @private
+   */
+  this.canWrapXInSource_ = this.sourceProj_.canWrapX() &&
+      !!maxSourceExtent &&
+      !!this.sourceProj_.getExtent() &&
+      (ol.extent.getWidth(maxSourceExtent) ==
+       ol.extent.getWidth(this.sourceProj_.getExtent()));
+
+  /**
+   * @type {?number}
+   * @private
+   */
+  this.sourceWorldWidth_ = this.sourceProj_.getExtent() ?
+      ol.extent.getWidth(this.sourceProj_.getExtent()) : null;
+
+  /**
+   * @type {?number}
+   * @private
+   */
+  this.targetWorldWidth_ = this.targetProj_.getExtent() ?
+      ol.extent.getWidth(this.targetProj_.getExtent()) : null;
+
+  var destinationTopLeft = ol.extent.getTopLeft(targetExtent);
+  var destinationTopRight = ol.extent.getTopRight(targetExtent);
+  var destinationBottomRight = ol.extent.getBottomRight(targetExtent);
+  var destinationBottomLeft = ol.extent.getBottomLeft(targetExtent);
+  var sourceTopLeft = this.transformInv_(destinationTopLeft);
+  var sourceTopRight = this.transformInv_(destinationTopRight);
+  var sourceBottomRight = this.transformInv_(destinationBottomRight);
+  var sourceBottomLeft = this.transformInv_(destinationBottomLeft);
+
+  this.addQuad_(
+      destinationTopLeft, destinationTopRight,
+      destinationBottomRight, destinationBottomLeft,
+      sourceTopLeft, sourceTopRight, sourceBottomRight, sourceBottomLeft,
+      ol.RASTER_REPROJECTION_MAX_SUBDIVISION);
+
+  if (this.wrapsXInSource_) {
+    // Fix coordinates (ol.proj returns wrapped coordinates, "unwrap" here).
+    // This significantly simplifies the rest of the reprojection process.
+
+    goog.asserts.assert(this.sourceWorldWidth_ !== null);
+    var leftBound = Infinity;
+    this.triangles_.forEach(function(triangle, i, arr) {
+      leftBound = Math.min(leftBound,
+          triangle.source[0][0], triangle.source[1][0], triangle.source[2][0]);
+    });
+
+    // Shift triangles to be as close to `leftBound` as possible
+    // (if the distance is more than `worldWidth / 2` it can be closer.
+    this.triangles_.forEach(function(triangle) {
+      if (Math.max(triangle.source[0][0], triangle.source[1][0],
+          triangle.source[2][0]) - leftBound > this.sourceWorldWidth_ / 2) {
+        var newTriangle = [[triangle.source[0][0], triangle.source[0][1]],
+                           [triangle.source[1][0], triangle.source[1][1]],
+                           [triangle.source[2][0], triangle.source[2][1]]];
+        if ((newTriangle[0][0] - leftBound) > this.sourceWorldWidth_ / 2) {
+          newTriangle[0][0] -= this.sourceWorldWidth_;
+        }
+        if ((newTriangle[1][0] - leftBound) > this.sourceWorldWidth_ / 2) {
+          newTriangle[1][0] -= this.sourceWorldWidth_;
+        }
+        if ((newTriangle[2][0] - leftBound) > this.sourceWorldWidth_ / 2) {
+          newTriangle[2][0] -= this.sourceWorldWidth_;
+        }
+
+        // Rarely (if the extent contains both the dateline and prime meridian)
+        // the shift can in turn break some triangles.
+        // Detect this here and don't shift in such cases.
+        var minX = Math.min(
+            newTriangle[0][0], newTriangle[1][0], newTriangle[2][0]);
+        var maxX = Math.max(
+            newTriangle[0][0], newTriangle[1][0], newTriangle[2][0]);
+        if ((maxX - minX) < this.sourceWorldWidth_ / 2) {
+          triangle.source = newTriangle;
+        }
+      }
+    }, this);
+  }
+
+  transformInvCache = {};
+};
+
+
+/**
+ * Adds triangle to the triangulation.
+ * @param {ol.Coordinate} a
+ * @param {ol.Coordinate} b
+ * @param {ol.Coordinate} c
+ * @param {ol.Coordinate} aSrc
+ * @param {ol.Coordinate} bSrc
+ * @param {ol.Coordinate} cSrc
+ * @private
+ */
+ol.reproj.Triangulation.prototype.addTriangle_ = function(a, b, c,
+    aSrc, bSrc, cSrc) {
+  this.triangles_.push({
+    source: [aSrc, bSrc, cSrc],
+    target: [a, b, c]
+  });
+};
+
+
+/**
+ * Adds quad (points in clock-wise order) to the triangulation
+ * (and reprojects the vertices) if valid.
+ * Performs quad subdivision if needed to increase precision.
+ *
+ * @param {ol.Coordinate} a
+ * @param {ol.Coordinate} b
+ * @param {ol.Coordinate} c
+ * @param {ol.Coordinate} d
+ * @param {ol.Coordinate} aSrc
+ * @param {ol.Coordinate} bSrc
+ * @param {ol.Coordinate} cSrc
+ * @param {ol.Coordinate} dSrc
+ * @param {number} maxSubdivision Maximal allowed subdivision of the quad.
+ * @private
+ */
+ol.reproj.Triangulation.prototype.addQuad_ = function(a, b, c, d,
+    aSrc, bSrc, cSrc, dSrc, maxSubdivision) {
+
+  var sourceQuadExtent = ol.extent.boundingExtent([aSrc, bSrc, cSrc, dSrc]);
+  var sourceCoverageX = this.sourceWorldWidth_ ?
+      ol.extent.getWidth(sourceQuadExtent) / this.sourceWorldWidth_ : null;
+
+  // when the quad is wrapped in the source projection
+  // it covers most of the projection extent, but not fully
+  var wrapsX = this.sourceProj_.canWrapX() &&
+               sourceCoverageX > 0.5 && sourceCoverageX < 1;
+
+  var needsSubdivision = false;
+
+  if (maxSubdivision > 0) {
+    if (this.targetProj_.isGlobal() && this.targetWorldWidth_) {
+      var targetQuadExtent = ol.extent.boundingExtent([a, b, c, d]);
+      var targetCoverageX =
+          ol.extent.getWidth(targetQuadExtent) / this.targetWorldWidth_;
+      needsSubdivision |=
+          targetCoverageX > ol.RASTER_REPROJECTION_MAX_TRIANGLE_WIDTH;
+    }
+    if (!wrapsX && this.sourceProj_.isGlobal() && sourceCoverageX) {
+      needsSubdivision |=
+          sourceCoverageX > ol.RASTER_REPROJECTION_MAX_TRIANGLE_WIDTH;
+    }
+  }
+
+  if (!needsSubdivision && this.maxSourceExtent_) {
+    if (!ol.extent.intersects(sourceQuadExtent, this.maxSourceExtent_)) {
+      // whole quad outside source projection extent -> ignore
+      return;
+    }
+  }
+
+  if (!needsSubdivision) {
+    if (!isFinite(aSrc[0]) || !isFinite(aSrc[1]) ||
+        !isFinite(bSrc[0]) || !isFinite(bSrc[1]) ||
+        !isFinite(cSrc[0]) || !isFinite(cSrc[1]) ||
+        !isFinite(dSrc[0]) || !isFinite(dSrc[1])) {
+      if (maxSubdivision > 0) {
+        needsSubdivision = true;
+      } else {
+        return;
+      }
+    }
+  }
+
+  if (maxSubdivision > 0) {
+    if (!needsSubdivision) {
+      var center = [(a[0] + c[0]) / 2, (a[1] + c[1]) / 2];
+      var centerSrc = this.transformInv_(center);
+
+      var dx;
+      if (wrapsX) {
+        goog.asserts.assert(this.sourceWorldWidth_);
+        var centerSrcEstimX =
+            (goog.math.modulo(aSrc[0], this.sourceWorldWidth_) +
+             goog.math.modulo(cSrc[0], this.sourceWorldWidth_)) / 2;
+        dx = centerSrcEstimX -
+            goog.math.modulo(centerSrc[0], this.sourceWorldWidth_);
+      } else {
+        dx = (aSrc[0] + cSrc[0]) / 2 - centerSrc[0];
+      }
+      var dy = (aSrc[1] + cSrc[1]) / 2 - centerSrc[1];
+      var centerSrcErrorSquared = dx * dx + dy * dy;
+      needsSubdivision = centerSrcErrorSquared > this.errorThresholdSquared_;
+    }
+    if (needsSubdivision) {
+      if (Math.abs(a[0] - c[0]) <= Math.abs(a[1] - c[1])) {
+        // split horizontally (top & bottom)
+        var bc = [(b[0] + c[0]) / 2, (b[1] + c[1]) / 2];
+        var bcSrc = this.transformInv_(bc);
+        var da = [(d[0] + a[0]) / 2, (d[1] + a[1]) / 2];
+        var daSrc = this.transformInv_(da);
+
+        this.addQuad_(
+            a, b, bc, da, aSrc, bSrc, bcSrc, daSrc, maxSubdivision - 1);
+        this.addQuad_(
+            da, bc, c, d, daSrc, bcSrc, cSrc, dSrc, maxSubdivision - 1);
+      } else {
+        // split vertically (left & right)
+        var ab = [(a[0] + b[0]) / 2, (a[1] + b[1]) / 2];
+        var abSrc = this.transformInv_(ab);
+        var cd = [(c[0] + d[0]) / 2, (c[1] + d[1]) / 2];
+        var cdSrc = this.transformInv_(cd);
+
+        this.addQuad_(
+            a, ab, cd, d, aSrc, abSrc, cdSrc, dSrc, maxSubdivision - 1);
+        this.addQuad_(
+            ab, b, c, cd, abSrc, bSrc, cSrc, cdSrc, maxSubdivision - 1);
+      }
+      return;
+    }
+  }
+
+  if (wrapsX) {
+    if (!this.canWrapXInSource_) {
+      return;
+    }
+    this.wrapsXInSource_ = true;
+  }
+
+  this.addTriangle_(a, c, d, aSrc, cSrc, dSrc);
+  this.addTriangle_(a, b, c, aSrc, bSrc, cSrc);
+};
+
+
+/**
+ * Calculates extent of the 'source' coordinates from all the triangles.
+ *
+ * @return {ol.Extent} Calculated extent.
+ */
+ol.reproj.Triangulation.prototype.calculateSourceExtent = function() {
+  var extent = ol.extent.createEmpty();
+
+  this.triangles_.forEach(function(triangle, i, arr) {
+    var src = triangle.source;
+    ol.extent.extendCoordinate(extent, src[0]);
+    ol.extent.extendCoordinate(extent, src[1]);
+    ol.extent.extendCoordinate(extent, src[2]);
+  });
+
+  return extent;
+};
+
+
+/**
+ * @return {Array.<ol.reproj.Triangle>} Array of the calculated triangles.
+ */
+ol.reproj.Triangulation.prototype.getTriangles = function() {
+  return this.triangles_;
+};
+
+goog.provide('ol.reproj.Image');
+goog.provide('ol.reproj.ImageFunctionType');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('ol.ImageBase');
+goog.require('ol.ImageState');
+goog.require('ol.extent');
+goog.require('ol.proj');
+goog.require('ol.reproj');
+goog.require('ol.reproj.Triangulation');
+
+
+/**
+ * @typedef {function(ol.Extent, number, number) : ol.ImageBase}
+ */
+ol.reproj.ImageFunctionType;
+
+
+
+/**
+ * @classdesc
+ * Class encapsulating single reprojected image.
+ * See {@link ol.source.Image}.
+ *
+ * @constructor
+ * @extends {ol.ImageBase}
+ * @param {ol.proj.Projection} sourceProj Source projection (of the data).
+ * @param {ol.proj.Projection} targetProj Target projection.
+ * @param {ol.Extent} targetExtent Target extent.
+ * @param {number} targetResolution Target resolution.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.reproj.ImageFunctionType} getImageFunction
+ *     Function returning source images (extent, resolution, pixelRatio).
+ */
+ol.reproj.Image = function(sourceProj, targetProj,
+    targetExtent, targetResolution, pixelRatio, getImageFunction) {
+
+  /**
+   * @private
+   * @type {ol.proj.Projection}
+   */
+  this.targetProj_ = targetProj;
+
+  /**
+   * @private
+   * @type {ol.Extent}
+   */
+  this.maxSourceExtent_ = sourceProj.getExtent();
+  var maxTargetExtent = targetProj.getExtent();
+
+  var limitedTargetExtent = maxTargetExtent ?
+      ol.extent.getIntersection(targetExtent, maxTargetExtent) : targetExtent;
+
+  var targetCenter = ol.extent.getCenter(limitedTargetExtent);
+  var sourceResolution = ol.reproj.calculateSourceResolution(
+      sourceProj, targetProj, targetCenter, targetResolution);
+
+  var errorThresholdInPixels = ol.DEFAULT_RASTER_REPROJECTION_ERROR_THRESHOLD;
+
+  /**
+   * @private
+   * @type {!ol.reproj.Triangulation}
+   */
+  this.triangulation_ = new ol.reproj.Triangulation(
+      sourceProj, targetProj, limitedTargetExtent, this.maxSourceExtent_,
+      sourceResolution * errorThresholdInPixels);
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.targetResolution_ = targetResolution;
+
+  /**
+   * @private
+   * @type {ol.Extent}
+   */
+  this.targetExtent_ = targetExtent;
+
+  var sourceExtent = this.triangulation_.calculateSourceExtent();
+
+  /**
+   * @private
+   * @type {ol.ImageBase}
+   */
+  this.sourceImage_ =
+      getImageFunction(sourceExtent, sourceResolution, pixelRatio);
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.sourcePixelRatio_ =
+      this.sourceImage_ ? this.sourceImage_.getPixelRatio() : 1;
+
+  /**
+   * @private
+   * @type {HTMLCanvasElement}
+   */
+  this.canvas_ = null;
+
+  /**
+   * @private
+   * @type {goog.events.Key}
+   */
+  this.sourceListenerKey_ = null;
+
+
+  var state = ol.ImageState.LOADED;
+  var attributions = [];
+
+  if (this.sourceImage_) {
+    state = ol.ImageState.IDLE;
+    attributions = this.sourceImage_.getAttributions();
+  }
+
+  goog.base(this, targetExtent, targetResolution, this.sourcePixelRatio_,
+            state, attributions);
+};
+goog.inherits(ol.reproj.Image, ol.ImageBase);
+
+
+/**
+ * @inheritDoc
+ */
+ol.reproj.Image.prototype.disposeInternal = function() {
+  if (this.state == ol.ImageState.LOADING) {
+    this.unlistenSource_();
+  }
+  goog.base(this, 'disposeInternal');
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.reproj.Image.prototype.getImage = function(opt_context) {
+  return this.canvas_;
+};
+
+
+/**
+ * @return {ol.proj.Projection} Projection.
+ */
+ol.reproj.Image.prototype.getProjection = function() {
+  return this.targetProj_;
+};
+
+
+/**
+ * @private
+ */
+ol.reproj.Image.prototype.reproject_ = function() {
+  var sourceState = this.sourceImage_.getState();
+  if (sourceState == ol.ImageState.LOADED) {
+    var width = ol.extent.getWidth(this.targetExtent_) / this.targetResolution_;
+    var height =
+        ol.extent.getHeight(this.targetExtent_) / this.targetResolution_;
+
+    this.canvas_ = ol.reproj.render(width, height, this.sourcePixelRatio_,
+        this.sourceImage_.getResolution(), this.maxSourceExtent_,
+        this.targetResolution_, this.targetExtent_, this.triangulation_, [{
+          extent: this.sourceImage_.getExtent(),
+          image: this.sourceImage_.getImage()
+        }]);
+  }
+  this.state = sourceState;
+  this.changed();
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.reproj.Image.prototype.load = function() {
+  if (this.state == ol.ImageState.IDLE) {
+    this.state = ol.ImageState.LOADING;
+    this.changed();
+
+    var sourceState = this.sourceImage_.getState();
+    if (sourceState == ol.ImageState.LOADED ||
+        sourceState == ol.ImageState.ERROR) {
+      this.reproject_();
+    } else {
+      this.sourceListenerKey_ = this.sourceImage_.listen(
+          goog.events.EventType.CHANGE, function(e) {
+            var sourceState = this.sourceImage_.getState();
+            if (sourceState == ol.ImageState.LOADED ||
+                sourceState == ol.ImageState.ERROR) {
+              this.unlistenSource_();
+              this.reproject_();
+            }
+          }, false, this);
+      this.sourceImage_.load();
+    }
+  }
+};
+
+
+/**
+ * @private
+ */
+ol.reproj.Image.prototype.unlistenSource_ = function() {
+  goog.asserts.assert(this.sourceListenerKey_,
+      'this.sourceListenerKey_ should not be null');
+  goog.events.unlistenByKey(this.sourceListenerKey_);
+  this.sourceListenerKey_ = null;
+};
+
+goog.provide('ol.source.Image');
+goog.provide('ol.source.ImageEvent');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.events.Event');
+goog.require('ol.Attribution');
+goog.require('ol.ImageState');
+goog.require('ol.array');
+goog.require('ol.extent');
+goog.require('ol.proj');
+goog.require('ol.reproj.Image');
+goog.require('ol.source.Source');
+
+
+/**
+ * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
+ *            extent: (null|ol.Extent|undefined),
+ *            logo: (string|olx.LogoOptions|undefined),
+ *            projection: ol.proj.ProjectionLike,
+ *            resolutions: (Array.<number>|undefined),
+ *            state: (ol.source.State|undefined)}}
+ */
+ol.source.ImageOptions;
+
+
+
+/**
+ * @classdesc
+ * Abstract base class; normally only used for creating subclasses and not
+ * instantiated in apps.
+ * Base class for sources providing a single image.
+ *
+ * @constructor
+ * @extends {ol.source.Source}
+ * @param {ol.source.ImageOptions} options Single image source options.
+ * @api
+ */
+ol.source.Image = function(options) {
+
+  goog.base(this, {
+    attributions: options.attributions,
+    extent: options.extent,
+    logo: options.logo,
+    projection: options.projection,
+    state: options.state
+  });
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.resolutions_ = options.resolutions !== undefined ?
+      options.resolutions : null;
+  goog.asserts.assert(!this.resolutions_ ||
+      goog.array.isSorted(this.resolutions_,
+          function(a, b) {
+            return b - a;
+          }, true), 'resolutions must be null or sorted in descending order');
+
+
+  /**
+   * @private
+   * @type {ol.reproj.Image}
+   */
+  this.reprojectedImage_ = null;
+
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.reprojectedRevision_ = 0;
+
+};
+goog.inherits(ol.source.Image, ol.source.Source);
+
+
+/**
+ * @return {Array.<number>} Resolutions.
+ */
+ol.source.Image.prototype.getResolutions = function() {
+  return this.resolutions_;
+};
+
+
+/**
+ * @protected
+ * @param {number} resolution Resolution.
+ * @return {number} Resolution.
+ */
+ol.source.Image.prototype.findNearestResolution =
+    function(resolution) {
+  if (this.resolutions_) {
+    var idx = ol.array.linearFindNearest(this.resolutions_, resolution, 0);
+    resolution = this.resolutions_[idx];
+  }
+  return resolution;
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {number} resolution Resolution.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {ol.ImageBase} Single image.
+ */
+ol.source.Image.prototype.getImage =
+    function(extent, resolution, pixelRatio, projection) {
+  var sourceProjection = this.getProjection();
+  if (!ol.ENABLE_RASTER_REPROJECTION ||
+      !sourceProjection ||
+      !projection ||
+      ol.proj.equivalent(sourceProjection, projection)) {
+    if (sourceProjection) {
+      projection = sourceProjection;
+    }
+    return this.getImageInternal(extent, resolution, pixelRatio, projection);
+  } else {
+    if (this.reprojectedImage_) {
+      if (this.reprojectedRevision_ == this.getRevision() &&
+          ol.proj.equivalent(
+              this.reprojectedImage_.getProjection(), projection) &&
+          this.reprojectedImage_.getResolution() == resolution &&
+          this.reprojectedImage_.getPixelRatio() == pixelRatio &&
+          ol.extent.equals(this.reprojectedImage_.getExtent(), extent)) {
+        return this.reprojectedImage_;
+      }
+      this.reprojectedImage_.dispose();
+      this.reprojectedImage_ = null;
+    }
+
+    this.reprojectedImage_ = new ol.reproj.Image(
+        sourceProjection, projection, extent, resolution, pixelRatio,
+        goog.bind(function(extent, resolution, pixelRatio) {
+          return this.getImageInternal(extent, resolution,
+              pixelRatio, sourceProjection);
+        }, this));
+    this.reprojectedRevision_ = this.getRevision();
+
+    return this.reprojectedImage_;
+  }
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {number} resolution Resolution.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {ol.ImageBase} Single image.
+ * @protected
+ */
+ol.source.Image.prototype.getImageInternal = goog.abstractMethod;
+
+
+/**
+ * Handle image change events.
+ * @param {goog.events.Event} event Event.
+ * @protected
+ */
+ol.source.Image.prototype.handleImageChange = function(event) {
+  var image = /** @type {ol.Image} */ (event.target);
+  switch (image.getState()) {
+    case ol.ImageState.LOADING:
+      this.dispatchEvent(
+          new ol.source.ImageEvent(ol.source.ImageEventType.IMAGELOADSTART,
+              image));
+      break;
+    case ol.ImageState.LOADED:
+      this.dispatchEvent(
+          new ol.source.ImageEvent(ol.source.ImageEventType.IMAGELOADEND,
+              image));
+      break;
+    case ol.ImageState.ERROR:
+      this.dispatchEvent(
+          new ol.source.ImageEvent(ol.source.ImageEventType.IMAGELOADERROR,
+              image));
+      break;
+  }
+};
+
+
+/**
+ * Default image load function for image sources that use ol.Image image
+ * instances.
+ * @param {ol.Image} image Image.
+ * @param {string} src Source.
+ */
+ol.source.Image.defaultImageLoadFunction = function(image, src) {
+  image.getImage().src = src;
+};
+
+
+
+/**
+ * @classdesc
+ * Events emitted by {@link ol.source.Image} instances are instances of this
+ * type.
+ *
+ * @constructor
+ * @extends {goog.events.Event}
+ * @implements {oli.source.ImageEvent}
+ * @param {string} type Type.
+ * @param {ol.Image} image The image.
+ */
+ol.source.ImageEvent = function(type, image) {
+
+  goog.base(this, type);
+
+  /**
+   * The image related to the event.
+   * @type {ol.Image}
+   * @api
+   */
+  this.image = image;
+
+};
+goog.inherits(ol.source.ImageEvent, goog.events.Event);
+
+
+/**
+ * @enum {string}
+ */
+ol.source.ImageEventType = {
+
+  /**
+   * Triggered when an image starts loading.
+   * @event ol.source.ImageEvent#imageloadstart
+   * @api
+   */
+  IMAGELOADSTART: 'imageloadstart',
+
+  /**
+   * Triggered when an image finishes loading.
+   * @event ol.source.ImageEvent#imageloadend
+   * @api
+   */
+  IMAGELOADEND: 'imageloadend',
+
+  /**
+   * Triggered if image loading results in an error.
+   * @event ol.source.ImageEvent#imageloaderror
+   * @api
+   */
+  IMAGELOADERROR: 'imageloaderror'
+
+};
+
+goog.provide('ol.source.ImageCanvas');
+
+goog.require('ol.CanvasFunctionType');
+goog.require('ol.ImageCanvas');
+goog.require('ol.extent');
+goog.require('ol.source.Image');
+
+
+
+/**
+ * @classdesc
+ * Base class for image sources where a canvas element is the image.
+ *
+ * @constructor
+ * @extends {ol.source.Image}
+ * @param {olx.source.ImageCanvasOptions} options
+ * @api
+ */
+ol.source.ImageCanvas = function(options) {
+
+  goog.base(this, {
+    attributions: options.attributions,
+    logo: options.logo,
+    projection: options.projection,
+    resolutions: options.resolutions,
+    state: options.state !== undefined ?
+        /** @type {ol.source.State} */ (options.state) : undefined
+  });
+
+  /**
+   * @private
+   * @type {ol.CanvasFunctionType}
+   */
+  this.canvasFunction_ = options.canvasFunction;
+
+  /**
+   * @private
+   * @type {ol.ImageCanvas}
+   */
+  this.canvas_ = null;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.renderedRevision_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.ratio_ = options.ratio !== undefined ?
+      options.ratio : 1.5;
+
+};
+goog.inherits(ol.source.ImageCanvas, ol.source.Image);
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.ImageCanvas.prototype.getImageInternal =
+    function(extent, resolution, pixelRatio, projection) {
+  resolution = this.findNearestResolution(resolution);
+
+  var canvas = this.canvas_;
+  if (canvas &&
+      this.renderedRevision_ == this.getRevision() &&
+      canvas.getResolution() == resolution &&
+      canvas.getPixelRatio() == pixelRatio &&
+      ol.extent.containsExtent(canvas.getExtent(), extent)) {
+    return canvas;
+  }
+
+  extent = extent.slice();
+  ol.extent.scaleFromCenter(extent, this.ratio_);
+  var width = ol.extent.getWidth(extent) / resolution;
+  var height = ol.extent.getHeight(extent) / resolution;
+  var size = [width * pixelRatio, height * pixelRatio];
+
+  var canvasElement = this.canvasFunction_(
+      extent, resolution, pixelRatio, size, projection);
+  if (canvasElement) {
+    canvas = new ol.ImageCanvas(extent, resolution, pixelRatio,
+        this.getAttributions(), canvasElement);
+  }
+  this.canvas_ = canvas;
+  this.renderedRevision_ = this.getRevision();
+
+  return canvas;
+};
+
+goog.provide('ol.Feature');
+goog.provide('ol.FeatureStyleFunction');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('ol');
+goog.require('ol.Object');
+goog.require('ol.geom.Geometry');
+goog.require('ol.style.Style');
+
+
+
+/**
+ * @classdesc
+ * A vector object for geographic features with a geometry and other
+ * attribute properties, similar to the features in vector file formats like
+ * GeoJSON.
+ *
+ * Features can be styled individually with `setStyle`; otherwise they use the
+ * style of their vector layer.
+ *
+ * Note that attribute properties are set as {@link ol.Object} properties on
+ * the feature object, so they are observable, and have get/set accessors.
+ *
+ * Typically, a feature has a single geometry property. You can set the
+ * geometry using the `setGeometry` method and get it with `getGeometry`.
+ * It is possible to store more than one geometry on a feature using attribute
+ * properties. By default, the geometry used for rendering is identified by
+ * the property name `geometry`. If you want to use another geometry property
+ * for rendering, use the `setGeometryName` method to change the attribute
+ * property associated with the geometry for the feature.  For example:
+ *
+ * ```js
+ * var feature = new ol.Feature({
+ *   geometry: new ol.geom.Polygon(polyCoords),
+ *   labelPoint: new ol.geom.Point(labelCoords),
+ *   name: 'My Polygon'
+ * });
+ *
+ * // get the polygon geometry
+ * var poly = feature.getGeometry();
+ *
+ * // Render the feature as a point using the coordinates from labelPoint
+ * feature.setGeometryName('labelPoint');
+ *
+ * // get the point geometry
+ * var point = feature.getGeometry();
+ * ```
+ *
+ * @constructor
+ * @extends {ol.Object}
+ * @param {ol.geom.Geometry|Object.<string, *>=} opt_geometryOrProperties
+ *     You may pass a Geometry object directly, or an object literal
+ *     containing properties.  If you pass an object literal, you may
+ *     include a Geometry associated with a `geometry` key.
+ * @api stable
+ */
+ol.Feature = function(opt_geometryOrProperties) {
+
+  goog.base(this);
+
+  /**
+   * @private
+   * @type {number|string|undefined}
+   */
+  this.id_ = undefined;
+
+  /**
+   * @type {string}
+   * @private
+   */
+  this.geometryName_ = 'geometry';
+
+  /**
+   * User provided style.
+   * @private
+   * @type {ol.style.Style|Array.<ol.style.Style>|
+   *     ol.FeatureStyleFunction}
+   */
+  this.style_ = null;
+
+  /**
+   * @private
+   * @type {ol.FeatureStyleFunction|undefined}
+   */
+  this.styleFunction_ = undefined;
+
+  /**
+   * @private
+   * @type {goog.events.Key}
+   */
+  this.geometryChangeKey_ = null;
+
+  goog.events.listen(
+      this, ol.Object.getChangeEventType(this.geometryName_),
+      this.handleGeometryChanged_, false, this);
+
+  if (opt_geometryOrProperties !== undefined) {
+    if (opt_geometryOrProperties instanceof ol.geom.Geometry ||
+        !opt_geometryOrProperties) {
+      var geometry = /** @type {ol.geom.Geometry} */ (opt_geometryOrProperties);
+      this.setGeometry(geometry);
+    } else {
+      goog.asserts.assert(goog.isObject(opt_geometryOrProperties),
+          'opt_geometryOrProperties should be an Object');
+      var properties = /** @type {Object.<string, *>} */
+          (opt_geometryOrProperties);
+      this.setProperties(properties);
+    }
+  }
+};
+goog.inherits(ol.Feature, ol.Object);
+
+
+/**
+ * Clone this feature. If the original feature has a geometry it
+ * is also cloned. The feature id is not set in the clone.
+ * @return {ol.Feature} The clone.
+ * @api stable
+ */
+ol.Feature.prototype.clone = function() {
+  var clone = new ol.Feature(this.getProperties());
+  clone.setGeometryName(this.getGeometryName());
+  var geometry = this.getGeometry();
+  if (geometry) {
+    clone.setGeometry(geometry.clone());
+  }
+  var style = this.getStyle();
+  if (style) {
+    clone.setStyle(style);
+  }
+  return clone;
+};
+
+
+/**
+ * Get the feature's default geometry.  A feature may have any number of named
+ * geometries.  The "default" geometry (the one that is rendered by default) is
+ * set when calling {@link ol.Feature#setGeometry}.
+ * @return {ol.geom.Geometry|undefined} The default geometry for the feature.
+ * @api stable
+ * @observable
+ */
+ol.Feature.prototype.getGeometry = function() {
+  return /** @type {ol.geom.Geometry|undefined} */ (
+      this.get(this.geometryName_));
+};
+
+
+/**
+ * Get the feature identifier.  This is a stable identifier for the feature and
+ * is either set when reading data from a remote source or set explicitly by
+ * calling {@link ol.Feature#setId}.
+ * @return {number|string|undefined} Id.
+ * @api stable
+ * @observable
+ */
+ol.Feature.prototype.getId = function() {
+  return this.id_;
+};
+
+
+/**
+ * Get the name of the feature's default geometry.  By default, the default
+ * geometry is named `geometry`.
+ * @return {string} Get the property name associated with the default geometry
+ *     for this feature.
+ * @api stable
+ */
+ol.Feature.prototype.getGeometryName = function() {
+  return this.geometryName_;
+};
+
+
+/**
+ * Get the feature's style.  This return for this method depends on what was
+ * provided to the {@link ol.Feature#setStyle} method.
+ * @return {ol.style.Style|Array.<ol.style.Style>|
+ *     ol.FeatureStyleFunction} The feature style.
+ * @api stable
+ * @observable
+ */
+ol.Feature.prototype.getStyle = function() {
+  return this.style_;
+};
+
+
+/**
+ * Get the feature's style function.
+ * @return {ol.FeatureStyleFunction|undefined} Return a function
+ * representing the current style of this feature.
+ * @api stable
+ */
+ol.Feature.prototype.getStyleFunction = function() {
+  return this.styleFunction_;
+};
+
+
+/**
+ * @private
+ */
+ol.Feature.prototype.handleGeometryChange_ = function() {
+  this.changed();
+};
+
+
+/**
+ * @private
+ */
+ol.Feature.prototype.handleGeometryChanged_ = function() {
+  if (this.geometryChangeKey_) {
+    goog.events.unlistenByKey(this.geometryChangeKey_);
+    this.geometryChangeKey_ = null;
+  }
+  var geometry = this.getGeometry();
+  if (geometry) {
+    this.geometryChangeKey_ = goog.events.listen(geometry,
+        goog.events.EventType.CHANGE, this.handleGeometryChange_, false, this);
+  }
+  this.changed();
+};
+
+
+/**
+ * Set the default geometry for the feature.  This will update the property
+ * with the name returned by {@link ol.Feature#getGeometryName}.
+ * @param {ol.geom.Geometry|undefined} geometry The new geometry.
+ * @api stable
+ * @observable
+ */
+ol.Feature.prototype.setGeometry = function(geometry) {
+  this.set(this.geometryName_, geometry);
+};
+
+
+/**
+ * Set the style for the feature.  This can be a single style object, an array
+ * of styles, or a function that takes a resolution and returns an array of
+ * styles. If it is `null` the feature has no style (a `null` style).
+ * @param {ol.style.Style|Array.<ol.style.Style>|
+ *     ol.FeatureStyleFunction} style Style for this feature.
+ * @api stable
+ * @observable
+ */
+ol.Feature.prototype.setStyle = function(style) {
+  this.style_ = style;
+  this.styleFunction_ = !style ?
+      undefined : ol.Feature.createStyleFunction(style);
+  this.changed();
+};
+
+
+/**
+ * Set the feature id.  The feature id is considered stable and may be used when
+ * requesting features or comparing identifiers returned from a remote source.
+ * The feature id can be used with the {@link ol.source.Vector#getFeatureById}
+ * method.
+ * @param {number|string|undefined} id The feature id.
+ * @api stable
+ * @observable
+ */
+ol.Feature.prototype.setId = function(id) {
+  this.id_ = id;
+  this.changed();
+};
+
+
+/**
+ * Set the property name to be used when getting the feature's default geometry.
+ * When calling {@link ol.Feature#getGeometry}, the value of the property with
+ * this name will be returned.
+ * @param {string} name The property name of the default geometry.
+ * @api stable
+ */
+ol.Feature.prototype.setGeometryName = function(name) {
+  goog.events.unlisten(
+      this, ol.Object.getChangeEventType(this.geometryName_),
+      this.handleGeometryChanged_, false, this);
+  this.geometryName_ = name;
+  goog.events.listen(
+      this, ol.Object.getChangeEventType(this.geometryName_),
+      this.handleGeometryChanged_, false, this);
+  this.handleGeometryChanged_();
+};
+
+
+/**
+ * A function that returns an array of {@link ol.style.Style styles} given a
+ * resolution. The `this` keyword inside the function references the
+ * {@link ol.Feature} to be styled.
+ *
+ * @typedef {function(this: ol.Feature, number):
+ *     (ol.style.Style|Array.<ol.style.Style>)}
+ * @api stable
+ */
+ol.FeatureStyleFunction;
+
+
+/**
+ * Convert the provided object into a feature style function.  Functions passed
+ * through unchanged.  Arrays of ol.style.Style or single style objects wrapped
+ * in a new feature style function.
+ * @param {ol.FeatureStyleFunction|!Array.<ol.style.Style>|!ol.style.Style} obj
+ *     A feature style function, a single style, or an array of styles.
+ * @return {ol.FeatureStyleFunction} A style function.
+ */
+ol.Feature.createStyleFunction = function(obj) {
+  var styleFunction;
+
+  if (goog.isFunction(obj)) {
+    styleFunction = obj;
+  } else {
+    /**
+     * @type {Array.<ol.style.Style>}
+     */
+    var styles;
+    if (goog.isArray(obj)) {
+      styles = obj;
+    } else {
+      goog.asserts.assertInstanceof(obj, ol.style.Style,
+          'obj should be an ol.style.Style');
+      styles = [obj];
+    }
+    styleFunction = function() {
+      return styles;
+    };
+  }
+  return styleFunction;
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Common events for the network classes.
+ */
+
+
+goog.provide('goog.net.EventType');
+
+
+/**
+ * Event names for network events
+ * @enum {string}
+ */
+goog.net.EventType = {
+  COMPLETE: 'complete',
+  SUCCESS: 'success',
+  ERROR: 'error',
+  ABORT: 'abort',
+  READY: 'ready',
+  READY_STATE_CHANGE: 'readystatechange',
+  TIMEOUT: 'timeout',
+  INCREMENTAL_DATA: 'incrementaldata',
+  PROGRESS: 'progress'
+};
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+goog.provide('goog.Thenable');
+
+
+
+/**
+ * Provides a more strict interface for Thenables in terms of
+ * http://promisesaplus.com for interop with {@see goog.Promise}.
+ *
+ * @interface
+ * @extends {IThenable<TYPE>}
+ * @template TYPE
+ */
+goog.Thenable = function() {};
+
+
+/**
+ * Adds callbacks that will operate on the result of the Thenable, returning a
+ * new child Promise.
+ *
+ * If the Thenable is fulfilled, the {@code onFulfilled} callback will be
+ * invoked with the fulfillment value as argument, and the child Promise will
+ * be fulfilled with the return value of the callback. If the callback throws
+ * an exception, the child Promise will be rejected with the thrown value
+ * instead.
+ *
+ * If the Thenable is rejected, the {@code onRejected} callback will be invoked
+ * with the rejection reason as argument, and the child Promise will be rejected
+ * with the return value of the callback or thrown value.
+ *
+ * @param {?(function(this:THIS, TYPE): VALUE)=} opt_onFulfilled A
+ *     function that will be invoked with the fulfillment value if the Promise
+ *     is fullfilled.
+ * @param {?(function(this:THIS, *): *)=} opt_onRejected A function that will
+ *     be invoked with the rejection reason if the Promise is rejected.
+ * @param {THIS=} opt_context An optional context object that will be the
+ *     execution context for the callbacks. By default, functions are executed
+ *     with the default this.
+ *
+ * @return {RESULT} A new Promise that will receive the result
+ *     of the fulfillment or rejection callback.
+ * @template VALUE
+ * @template THIS
+ *
+ * When a Promise (or thenable) is returned from the fulfilled callback,
+ * the result is the payload of that promise, not the promise itself.
+ *
+ * @template RESULT := type('goog.Promise',
+ *     cond(isUnknown(VALUE), unknown(),
+ *       mapunion(VALUE, (V) =>
+ *         cond(isTemplatized(V) && sub(rawTypeOf(V), 'IThenable'),
+ *           templateTypeOf(V, 0),
+ *           cond(sub(V, 'Thenable'),
+ *              unknown(),
+ *              V)))))
+ *  =:
+ *
+ */
+goog.Thenable.prototype.then = function(opt_onFulfilled, opt_onRejected,
+    opt_context) {};
+
+
+/**
+ * An expando property to indicate that an object implements
+ * {@code goog.Thenable}.
+ *
+ * {@see addImplementation}.
+ *
+ * @const
+ */
+goog.Thenable.IMPLEMENTED_BY_PROP = '$goog_Thenable';
+
+
+/**
+ * Marks a given class (constructor) as an implementation of Thenable, so
+ * that we can query that fact at runtime. The class must have already
+ * implemented the interface.
+ * Exports a 'then' method on the constructor prototype, so that the objects
+ * also implement the extern {@see goog.Thenable} interface for interop with
+ * other Promise implementations.
+ * @param {function(new:goog.Thenable,...?)} ctor The class constructor. The
+ *     corresponding class must have already implemented the interface.
+ */
+goog.Thenable.addImplementation = function(ctor) {
+  goog.exportProperty(ctor.prototype, 'then', ctor.prototype.then);
+  if (COMPILED) {
+    ctor.prototype[goog.Thenable.IMPLEMENTED_BY_PROP] = true;
+  } else {
+    // Avoids dictionary access in uncompiled mode.
+    ctor.prototype.$goog_Thenable = true;
+  }
+};
+
+
+/**
+ * @param {*} object
+ * @return {boolean} Whether a given instance implements {@code goog.Thenable}.
+ *     The class/superclass of the instance must call {@code addImplementation}.
+ */
+goog.Thenable.isImplementedBy = function(object) {
+  if (!object) {
+    return false;
+  }
+  try {
+    if (COMPILED) {
+      return !!object[goog.Thenable.IMPLEMENTED_BY_PROP];
+    }
+    return !!object.$goog_Thenable;
+  } catch (e) {
+    // Property access seems to be forbidden.
+    return false;
+  }
+};
+
+// Copyright 2015 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Simple freelist.
+ *
+ * An anterative to goog.structs.SimplePool, it imposes the requirement that the
+ * objects in the list contain a "next" property that can be used to maintain
+ * the pool.
+ */
+
+goog.provide('goog.async.FreeList');
+
+
+/**
+ * @template ITEM
+ */
+goog.async.FreeList = goog.defineClass(null, {
+  /**
+   * @param {function():ITEM} create
+   * @param {function(ITEM):void} reset
+   * @param {number} limit
+   */
+  constructor: function(create, reset, limit) {
+    /** @const {number} */
+    this.limit_ = limit;
+    /** @const {function()} */
+    this.create_ = create;
+    /** @const {function(ITEM):void} */
+    this.reset_ = reset;
+
+    /** @type {number} */
+    this.occupants_ = 0;
+    /** @type {ITEM} */
+    this.head_ = null;
+  },
+
+  /**
+   * @return {ITEM}
+   */
+  get: function() {
+    var item;
+    if (this.occupants_ > 0) {
+      this.occupants_--;
+      item = this.head_;
+      this.head_ = item.next;
+      item.next = null;
+    } else {
+      item = this.create_();
+    }
+    return item;
+  },
+
+  /**
+   * @param {ITEM} item An item available for possible future reuse.
+   */
+  put: function(item) {
+    this.reset_(item);
+    if (this.occupants_ < this.limit_) {
+      this.occupants_++;
+      item.next = this.head_;
+      this.head_ = item;
+    }
+  },
+
+  /**
+   * Visible for testing.
+   * @package
+   * @return {number}
+   */
+  occupants: function() {
+    return this.occupants_;
+  }
+});
+
+
+
+
+// Copyright 2015 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+goog.provide('goog.async.WorkItem');
+goog.provide('goog.async.WorkQueue');
+
+goog.require('goog.asserts');
+goog.require('goog.async.FreeList');
+
+
+// TODO(johnlenz): generalize the WorkQueue if this is used by more
+// than goog.async.run.
+
+
+
+/**
+ * A low GC workqueue. The key elements of this design:
+ *   - avoids the need for goog.bind or equivalent by carrying scope
+ *   - avoids the need for array reallocation by using a linked list
+ *   - minimizes work entry objects allocation by recycling objects
+ * @constructor
+ * @final
+ * @struct
+ */
+goog.async.WorkQueue = function() {
+  this.workHead_ = null;
+  this.workTail_ = null;
+};
+
+
+/** @define {number} The maximum number of entries to keep for recycling. */
+goog.define('goog.async.WorkQueue.DEFAULT_MAX_UNUSED', 100);
+
+
+/** @const @private {goog.async.FreeList<goog.async.WorkItem>} */
+goog.async.WorkQueue.freelist_ = new goog.async.FreeList(
+    function() {return new goog.async.WorkItem(); },
+    function(item) {item.reset()},
+    goog.async.WorkQueue.DEFAULT_MAX_UNUSED);
+
+
+/**
+ * @param {function()} fn
+ * @param {Object|null|undefined} scope
+ */
+goog.async.WorkQueue.prototype.add = function(fn, scope) {
+  var item = this.getUnusedItem_();
+  item.set(fn, scope);
+
+  if (this.workTail_) {
+    this.workTail_.next = item;
+    this.workTail_ = item;
+  } else {
+    goog.asserts.assert(!this.workHead_);
+    this.workHead_ = item;
+    this.workTail_ = item;
+  }
+};
+
+
+/**
+ * @return {goog.async.WorkItem}
+ */
+goog.async.WorkQueue.prototype.remove = function() {
+  var item = null;
+
+  if (this.workHead_) {
+    item = this.workHead_;
+    this.workHead_ = this.workHead_.next;
+    if (!this.workHead_) {
+      this.workTail_ = null;
+    }
+    item.next = null;
+  }
+  return item;
+};
+
+
+/**
+ * @param {goog.async.WorkItem} item
+ */
+goog.async.WorkQueue.prototype.returnUnused = function(item) {
+  goog.async.WorkQueue.freelist_.put(item);
+};
+
+
+/**
+ * @return {goog.async.WorkItem}
+ * @private
+ */
+goog.async.WorkQueue.prototype.getUnusedItem_ = function() {
+  return goog.async.WorkQueue.freelist_.get();
+};
+
+
+
+/**
+ * @constructor
+ * @final
+ * @struct
+ */
+goog.async.WorkItem = function() {
+  /** @type {?function()} */
+  this.fn = null;
+  /** @type {Object|null|undefined} */
+  this.scope = null;
+  /** @type {?goog.async.WorkItem} */
+  this.next = null;
+};
+
+
+/**
+ * @param {function()} fn
+ * @param {Object|null|undefined} scope
+ */
+goog.async.WorkItem.prototype.set = function(fn, scope) {
+  this.fn = fn;
+  this.scope = scope;
+  this.next = null;
+};
+
+
+/** Reset the work item so they don't prevent GC before reuse */
+goog.async.WorkItem.prototype.reset = function() {
+  this.fn = null;
+  this.scope = null;
+  this.next = null;
+};
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Simple notifiers for the Closure testing framework.
+ *
+ * @author johnlenz@google.com (John Lenz)
+ */
+
+goog.provide('goog.testing.watchers');
+
+
+/** @private {!Array<function()>} */
+goog.testing.watchers.resetWatchers_ = [];
+
+
+/**
+ * Fires clock reset watching functions.
+ */
+goog.testing.watchers.signalClockReset = function() {
+  var watchers = goog.testing.watchers.resetWatchers_;
+  for (var i = 0; i < watchers.length; i++) {
+    goog.testing.watchers.resetWatchers_[i]();
+  }
+};
+
+
+/**
+ * Enqueues a function to be called when the clock used for setTimeout is reset.
+ * @param {function()} fn
+ */
+goog.testing.watchers.watchClockReset = function(fn) {
+  goog.testing.watchers.resetWatchers_.push(fn);
+};
+
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+goog.provide('goog.async.run');
+
+goog.require('goog.async.WorkQueue');
+goog.require('goog.async.nextTick');
+goog.require('goog.async.throwException');
+goog.require('goog.testing.watchers');
+
+
+/**
+ * Fires the provided callback just before the current callstack unwinds, or as
+ * soon as possible after the current JS execution context.
+ * @param {function(this:THIS)} callback
+ * @param {THIS=} opt_context Object to use as the "this value" when calling
+ *     the provided function.
+ * @template THIS
+ */
+goog.async.run = function(callback, opt_context) {
+  if (!goog.async.run.schedule_) {
+    goog.async.run.initializeRunner_();
+  }
+  if (!goog.async.run.workQueueScheduled_) {
+    // Nothing is currently scheduled, schedule it now.
+    goog.async.run.schedule_();
+    goog.async.run.workQueueScheduled_ = true;
+  }
+
+  goog.async.run.workQueue_.add(callback, opt_context);
+};
+
+
+/**
+ * Initializes the function to use to process the work queue.
+ * @private
+ */
+goog.async.run.initializeRunner_ = function() {
+  // If native Promises are available in the browser, just schedule the callback
+  // on a fulfilled promise, which is specified to be async, but as fast as
+  // possible.
+  if (goog.global.Promise && goog.global.Promise.resolve) {
+    var promise = goog.global.Promise.resolve(undefined);
+    goog.async.run.schedule_ = function() {
+      promise.then(goog.async.run.processWorkQueue);
+    };
+  } else {
+    goog.async.run.schedule_ = function() {
+      goog.async.nextTick(goog.async.run.processWorkQueue);
+    };
+  }
+};
+
+
+/**
+ * Forces goog.async.run to use nextTick instead of Promise.
+ *
+ * This should only be done in unit tests. It's useful because MockClock
+ * replaces nextTick, but not the browser Promise implementation, so it allows
+ * Promise-based code to be tested with MockClock.
+ *
+ * However, we also want to run promises if the MockClock is no longer in
+ * control so we schedule a backup "setTimeout" to the unmocked timeout if
+ * provided.
+ *
+ * @param {function(function())=} opt_realSetTimeout
+ */
+goog.async.run.forceNextTick = function(opt_realSetTimeout) {
+  goog.async.run.schedule_ = function() {
+    goog.async.nextTick(goog.async.run.processWorkQueue);
+    if (opt_realSetTimeout) {
+      opt_realSetTimeout(goog.async.run.processWorkQueue);
+    }
+  };
+};
+
+
+/**
+ * The function used to schedule work asynchronousely.
+ * @private {function()}
+ */
+goog.async.run.schedule_;
+
+
+/** @private {boolean} */
+goog.async.run.workQueueScheduled_ = false;
+
+
+/** @private {!goog.async.WorkQueue} */
+goog.async.run.workQueue_ = new goog.async.WorkQueue();
+
+
+if (goog.DEBUG) {
+  /**
+   * Reset the work queue.
+   * @private
+   */
+  goog.async.run.resetQueue_ = function() {
+    goog.async.run.workQueueScheduled_ = false;
+    goog.async.run.workQueue_ = new goog.async.WorkQueue();
+  };
+
+  // If there is a clock implemenation in use for testing
+  // and it is reset, reset the queue.
+  goog.testing.watchers.watchClockReset(goog.async.run.resetQueue_);
+}
+
+
+/**
+ * Run any pending goog.async.run work items. This function is not intended
+ * for general use, but for use by entry point handlers to run items ahead of
+ * goog.async.nextTick.
+ */
+goog.async.run.processWorkQueue = function() {
+  // NOTE: additional work queue items may be added while processing.
+  var item = null;
+  while (item = goog.async.run.workQueue_.remove()) {
+    try {
+      item.fn.call(item.scope);
+    } catch (e) {
+      goog.async.throwException(e);
+    }
+    goog.async.run.workQueue_.returnUnused(item);
+  }
+
+  // There are no more work items, allow processing to be scheduled again.
+  goog.async.run.workQueueScheduled_ = false;
+};
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+goog.provide('goog.promise.Resolver');
+
+
+
+/**
+ * Resolver interface for promises. The resolver is a convenience interface that
+ * bundles the promise and its associated resolve and reject functions together,
+ * for cases where the resolver needs to be persisted internally.
+ *
+ * @interface
+ * @template TYPE
+ */
+goog.promise.Resolver = function() {};
+
+
+/**
+ * The promise that created this resolver.
+ * @type {!goog.Promise<TYPE>}
+ */
+goog.promise.Resolver.prototype.promise;
+
+
+/**
+ * Resolves this resolver with the specified value.
+ * @type {function((TYPE|goog.Promise<TYPE>|Thenable)=)}
+ */
+goog.promise.Resolver.prototype.resolve;
+
+
+/**
+ * Rejects this resolver with the specified reason.
+ * @type {function(*=): void}
+ */
+goog.promise.Resolver.prototype.reject;
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+goog.provide('goog.Promise');
+
+goog.require('goog.Thenable');
+goog.require('goog.asserts');
+goog.require('goog.async.FreeList');
+goog.require('goog.async.run');
+goog.require('goog.async.throwException');
+goog.require('goog.debug.Error');
+goog.require('goog.promise.Resolver');
+
+
+
+/**
+ * Promises provide a result that may be resolved asynchronously. A Promise may
+ * be resolved by being fulfilled with a fulfillment value, rejected with a
+ * rejection reason, or blocked by another Promise. A Promise is said to be
+ * settled if it is either fulfilled or rejected. Once settled, the Promise
+ * result is immutable.
+ *
+ * Promises may represent results of any type, including undefined. Rejection
+ * reasons are typically Errors, but may also be of any type. Closure Promises
+ * allow for optional type annotations that enforce that fulfillment values are
+ * of the appropriate types at compile time.
+ *
+ * The result of a Promise is accessible by calling {@code then} and registering
+ * {@code onFulfilled} and {@code onRejected} callbacks. Once the Promise
+ * is settled, the relevant callbacks are invoked with the fulfillment value or
+ * rejection reason as argument. Callbacks are always invoked in the order they
+ * were registered, even when additional {@code then} calls are made from inside
+ * another callback. A callback is always run asynchronously sometime after the
+ * scope containing the registering {@code then} invocation has returned.
+ *
+ * If a Promise is resolved with another Promise, the first Promise will block
+ * until the second is settled, and then assumes the same result as the second
+ * Promise. This allows Promises to depend on the results of other Promises,
+ * linking together multiple asynchronous operations.
+ *
+ * This implementation is compatible with the Promises/A+ specification and
+ * passes that specification's conformance test suite. A Closure Promise may be
+ * resolved with a Promise instance (or sufficiently compatible Promise-like
+ * object) created by other Promise implementations. From the specification,
+ * Promise-like objects are known as "Thenables".
+ *
+ * @see http://promisesaplus.com/
+ *
+ * @param {function(
+ *             this:RESOLVER_CONTEXT,
+ *             function((TYPE|IThenable<TYPE>|Thenable)=),
+ *             function(*=)): void} resolver
+ *     Initialization function that is invoked immediately with {@code resolve}
+ *     and {@code reject} functions as arguments. The Promise is resolved or
+ *     rejected with the first argument passed to either function.
+ * @param {RESOLVER_CONTEXT=} opt_context An optional context for executing the
+ *     resolver function. If unspecified, the resolver function will be executed
+ *     in the default scope.
+ * @constructor
+ * @struct
+ * @final
+ * @implements {goog.Thenable<TYPE>}
+ * @template TYPE,RESOLVER_CONTEXT
+ */
+goog.Promise = function(resolver, opt_context) {
+  /**
+   * The internal state of this Promise. Either PENDING, FULFILLED, REJECTED, or
+   * BLOCKED.
+   * @private {goog.Promise.State_}
+   */
+  this.state_ = goog.Promise.State_.PENDING;
+
+  /**
+   * The settled result of the Promise. Immutable once set with either a
+   * fulfillment value or rejection reason.
+   * @private {*}
+   */
+  this.result_ = undefined;
+
+  /**
+   * For Promises created by calling {@code then()}, the originating parent.
+   * @private {goog.Promise}
+   */
+  this.parent_ = null;
+
+  /**
+   * The linked list of {@code onFulfilled} and {@code onRejected} callbacks
+   * added to this Promise by calls to {@code then()}.
+   * @private {?goog.Promise.CallbackEntry_}
+   */
+  this.callbackEntries_ = null;
+
+  /**
+   * The tail of the linked list of {@code onFulfilled} and {@code onRejected}
+   * callbacks added to this Promise by calls to {@code then()}.
+   * @private {?goog.Promise.CallbackEntry_}
+   */
+  this.callbackEntriesTail_ = null;
+
+  /**
+   * Whether the Promise is in the queue of Promises to execute.
+   * @private {boolean}
+   */
+  this.executing_ = false;
+
+  if (goog.Promise.UNHANDLED_REJECTION_DELAY > 0) {
+    /**
+     * A timeout ID used when the {@code UNHANDLED_REJECTION_DELAY} is greater
+     * than 0 milliseconds. The ID is set when the Promise is rejected, and
+     * cleared only if an {@code onRejected} callback is invoked for the
+     * Promise (or one of its descendants) before the delay is exceeded.
+     *
+     * If the rejection is not handled before the timeout completes, the
+     * rejection reason is passed to the unhandled rejection handler.
+     * @private {number}
+     */
+    this.unhandledRejectionId_ = 0;
+  } else if (goog.Promise.UNHANDLED_REJECTION_DELAY == 0) {
+    /**
+     * When the {@code UNHANDLED_REJECTION_DELAY} is set to 0 milliseconds, a
+     * boolean that is set if the Promise is rejected, and reset to false if an
+     * {@code onRejected} callback is invoked for the Promise (or one of its
+     * descendants). If the rejection is not handled before the next timestep,
+     * the rejection reason is passed to the unhandled rejection handler.
+     * @private {boolean}
+     */
+    this.hadUnhandledRejection_ = false;
+  }
+
+  if (goog.Promise.LONG_STACK_TRACES) {
+    /**
+     * A list of stack trace frames pointing to the locations where this Promise
+     * was created or had callbacks added to it. Saved to add additional context
+     * to stack traces when an exception is thrown.
+     * @private {!Array<string>}
+     */
+    this.stack_ = [];
+    this.addStackTrace_(new Error('created'));
+
+    /**
+     * Index of the most recently executed stack frame entry.
+     * @private {number}
+     */
+    this.currentStep_ = 0;
+  }
+
+  // As an optimization, we can skip this if resolver is goog.nullFunction.
+  // This value is passed internally when creating a promise which will be
+  // resolved through a more optimized path.
+  if (resolver != goog.nullFunction) {
+    try {
+      var self = this;
+      resolver.call(
+          opt_context,
+          function(value) {
+            self.resolve_(goog.Promise.State_.FULFILLED, value);
+          },
+          function(reason) {
+            if (goog.DEBUG &&
+                !(reason instanceof goog.Promise.CancellationError)) {
+              try {
+                // Promise was rejected. Step up one call frame to see why.
+                if (reason instanceof Error) {
+                  throw reason;
+                } else {
+                  throw new Error('Promise rejected.');
+                }
+              } catch (e) {
+                // Only thrown so browser dev tools can catch rejections of
+                // promises when the option to break on caught exceptions is
+                // activated.
+              }
+            }
+            self.resolve_(goog.Promise.State_.REJECTED, reason);
+          });
+    } catch (e) {
+      this.resolve_(goog.Promise.State_.REJECTED, e);
+    }
+  }
+};
+
+
+/**
+ * @define {boolean} Whether traces of {@code then} calls should be included in
+ * exceptions thrown
+ */
+goog.define('goog.Promise.LONG_STACK_TRACES', false);
+
+
+/**
+ * @define {number} The delay in milliseconds before a rejected Promise's reason
+ * is passed to the rejection handler. By default, the rejection handler
+ * rethrows the rejection reason so that it appears in the developer console or
+ * {@code window.onerror} handler.
+ *
+ * Rejections are rethrown as quickly as possible by default. A negative value
+ * disables rejection handling entirely.
+ */
+goog.define('goog.Promise.UNHANDLED_REJECTION_DELAY', 0);
+
+
+/**
+ * The possible internal states for a Promise. These states are not directly
+ * observable to external callers.
+ * @enum {number}
+ * @private
+ */
+goog.Promise.State_ = {
+  /** The Promise is waiting for resolution. */
+  PENDING: 0,
+
+  /** The Promise is blocked waiting for the result of another Thenable. */
+  BLOCKED: 1,
+
+  /** The Promise has been resolved with a fulfillment value. */
+  FULFILLED: 2,
+
+  /** The Promise has been resolved with a rejection reason. */
+  REJECTED: 3
+};
+
+
+
+/**
+ * Entries in the callback chain. Each call to {@code then},
+ * {@code thenCatch}, or {@code thenAlways} creates an entry containing the
+ * functions that may be invoked once the Promise is settled.
+ *
+ * @private @final @struct @constructor
+ */
+goog.Promise.CallbackEntry_ = function() {
+  /** @type {?goog.Promise} */
+  this.child = null;
+  /** @type {Function} */
+  this.onFulfilled = null;
+  /** @type {Function} */
+  this.onRejected = null;
+  /** @type {?} */
+  this.context = null;
+  /** @type {?goog.Promise.CallbackEntry_} */
+  this.next = null;
+
+  /**
+   * A boolean value to indicate this is a "thenAlways" callback entry.
+   * Unlike a normal "then/thenVoid" a "thenAlways doesn't participate
+   * in "cancel" considerations but is simply an observer and requires
+   * special handling.
+   * @type {boolean}
+   */
+  this.always = false;
+};
+
+
+/** clear the object prior to reuse */
+goog.Promise.CallbackEntry_.prototype.reset = function() {
+  this.child = null;
+  this.onFulfilled = null;
+  this.onRejected = null;
+  this.context = null;
+  this.always = false;
+};
+
+
+/**
+ * @define {number} The number of currently unused objects to keep around for
+ *    reuse.
+ */
+goog.define('goog.Promise.DEFAULT_MAX_UNUSED', 100);
+
+
+/** @const @private {goog.async.FreeList<!goog.Promise.CallbackEntry_>} */
+goog.Promise.freelist_ = new goog.async.FreeList(
+    function() {
+      return new goog.Promise.CallbackEntry_();
+    },
+    function(item) {
+      item.reset();
+    },
+    goog.Promise.DEFAULT_MAX_UNUSED);
+
+
+/**
+ * @param {Function} onFulfilled
+ * @param {Function} onRejected
+ * @param {?} context
+ * @return {!goog.Promise.CallbackEntry_}
+ * @private
+ */
+goog.Promise.getCallbackEntry_ = function(onFulfilled, onRejected, context) {
+  var entry = goog.Promise.freelist_.get();
+  entry.onFulfilled = onFulfilled;
+  entry.onRejected = onRejected;
+  entry.context = context;
+  return entry;
+};
+
+
+/**
+ * @param {!goog.Promise.CallbackEntry_} entry
+ * @private
+ */
+goog.Promise.returnEntry_ = function(entry) {
+  goog.Promise.freelist_.put(entry);
+};
+
+
+// NOTE: this is the same template expression as is used for
+// goog.IThenable.prototype.then
+
+
+/**
+ * @param {VALUE=} opt_value
+ * @return {RESULT} A new Promise that is immediately resolved
+ *     with the given value. If the input value is already a goog.Promise, it
+ *     will be returned immediately without creating a new instance.
+ * @template VALUE
+ * @template RESULT := type('goog.Promise',
+ *     cond(isUnknown(VALUE), unknown(),
+ *       mapunion(VALUE, (V) =>
+ *         cond(isTemplatized(V) && sub(rawTypeOf(V), 'IThenable'),
+ *           templateTypeOf(V, 0),
+ *           cond(sub(V, 'Thenable'),
+ *              unknown(),
+ *              V)))))
+ * =:
+ */
+goog.Promise.resolve = function(opt_value) {
+  if (opt_value instanceof goog.Promise) {
+    // Avoid creating a new object if we already have a promise object
+    // of the correct type.
+    return opt_value;
+  }
+
+  // Passing goog.nullFunction will cause the constructor to take an optimized
+  // path that skips calling the resolver function.
+  var promise = new goog.Promise(goog.nullFunction);
+  promise.resolve_(goog.Promise.State_.FULFILLED, opt_value);
+  return promise;
+};
+
+
+/**
+ * @param {*=} opt_reason
+ * @return {!goog.Promise} A new Promise that is immediately rejected with the
+ *     given reason.
+ */
+goog.Promise.reject = function(opt_reason) {
+  return new goog.Promise(function(resolve, reject) {
+    reject(opt_reason);
+  });
+};
+
+
+/**
+ * This is identical to
+ * {@code goog.Promise.resolve(value).then(onFulfilled, onRejected)}, but it
+ * avoids creating an unnecessary wrapper Promise when {@code value} is already
+ * thenable.
+ *
+ * @param {?(goog.Thenable<TYPE>|Thenable|TYPE)} value
+ * @param {function(TYPE): ?} onFulfilled
+ * @param {function(*): *} onRejected
+ * @template TYPE
+ * @private
+ */
+goog.Promise.resolveThen_ = function(value, onFulfilled, onRejected) {
+  var isThenable = goog.Promise.maybeThen_(
+      value, onFulfilled, onRejected, null);
+  if (!isThenable) {
+    goog.async.run(goog.partial(onFulfilled, value));
+  }
+};
+
+
+/**
+ * @param {!Array<?(goog.Promise<TYPE>|goog.Thenable<TYPE>|Thenable|*)>}
+ *     promises
+ * @return {!goog.Promise<TYPE>} A Promise that receives the result of the
+ *     first Promise (or Promise-like) input to settle immediately after it
+ *     settles.
+ * @template TYPE
+ */
+goog.Promise.race = function(promises) {
+  return new goog.Promise(function(resolve, reject) {
+    if (!promises.length) {
+      resolve(undefined);
+    }
+    for (var i = 0, promise; i < promises.length; i++) {
+      promise = promises[i];
+      goog.Promise.resolveThen_(promise, resolve, reject);
+    }
+  });
+};
+
+
+/**
+ * @param {!Array<?(goog.Promise<TYPE>|goog.Thenable<TYPE>|Thenable|*)>}
+ *     promises
+ * @return {!goog.Promise<!Array<TYPE>>} A Promise that receives a list of
+ *     every fulfilled value once every input Promise (or Promise-like) is
+ *     successfully fulfilled, or is rejected with the first rejection reason
+ *     immediately after it is rejected.
+ * @template TYPE
+ */
+goog.Promise.all = function(promises) {
+  return new goog.Promise(function(resolve, reject) {
+    var toFulfill = promises.length;
+    var values = [];
+
+    if (!toFulfill) {
+      resolve(values);
+      return;
+    }
+
+    var onFulfill = function(index, value) {
+      toFulfill--;
+      values[index] = value;
+      if (toFulfill == 0) {
+        resolve(values);
+      }
+    };
+
+    var onReject = function(reason) {
+      reject(reason);
+    };
+
+    for (var i = 0, promise; i < promises.length; i++) {
+      promise = promises[i];
+      goog.Promise.resolveThen_(
+          promise, goog.partial(onFulfill, i), onReject);
+    }
+  });
+};
+
+
+/**
+ * @param {!Array<?(goog.Promise<TYPE>|goog.Thenable<TYPE>|Thenable|*)>}
+ *     promises
+ * @return {!goog.Promise<!Array<{
+ *     fulfilled: boolean,
+ *     value: (TYPE|undefined),
+ *     reason: (*|undefined)}>>} A Promise that resolves with a list of
+ *         result objects once all input Promises (or Promise-like) have
+ *         settled. Each result object contains a 'fulfilled' boolean indicating
+ *         whether an input Promise was fulfilled or rejected. For fulfilled
+ *         Promises, the resulting value is stored in the 'value' field. For
+ *         rejected Promises, the rejection reason is stored in the 'reason'
+ *         field.
+ * @template TYPE
+ */
+goog.Promise.allSettled = function(promises) {
+  return new goog.Promise(function(resolve, reject) {
+    var toSettle = promises.length;
+    var results = [];
+
+    if (!toSettle) {
+      resolve(results);
+      return;
+    }
+
+    var onSettled = function(index, fulfilled, result) {
+      toSettle--;
+      results[index] = fulfilled ?
+          {fulfilled: true, value: result} :
+          {fulfilled: false, reason: result};
+      if (toSettle == 0) {
+        resolve(results);
+      }
+    };
+
+    for (var i = 0, promise; i < promises.length; i++) {
+      promise = promises[i];
+      goog.Promise.resolveThen_(promise,
+          goog.partial(onSettled, i, true /* fulfilled */),
+          goog.partial(onSettled, i, false /* fulfilled */));
+    }
+  });
+};
+
+
+/**
+ * @param {!Array<?(goog.Promise<TYPE>|goog.Thenable<TYPE>|Thenable|*)>}
+ *     promises
+ * @return {!goog.Promise<TYPE>} A Promise that receives the value of the first
+ *     input to be fulfilled, or is rejected with a list of every rejection
+ *     reason if all inputs are rejected.
+ * @template TYPE
+ */
+goog.Promise.firstFulfilled = function(promises) {
+  return new goog.Promise(function(resolve, reject) {
+    var toReject = promises.length;
+    var reasons = [];
+
+    if (!toReject) {
+      resolve(undefined);
+      return;
+    }
+
+    var onFulfill = function(value) {
+      resolve(value);
+    };
+
+    var onReject = function(index, reason) {
+      toReject--;
+      reasons[index] = reason;
+      if (toReject == 0) {
+        reject(reasons);
+      }
+    };
+
+    for (var i = 0, promise; i < promises.length; i++) {
+      promise = promises[i];
+      goog.Promise.resolveThen_(
+          promise, onFulfill, goog.partial(onReject, i));
+    }
+  });
+};
+
+
+/**
+ * @return {!goog.promise.Resolver<TYPE>} Resolver wrapping the promise and its
+ *     resolve / reject functions. Resolving or rejecting the resolver
+ *     resolves or rejects the promise.
+ * @template TYPE
+ */
+goog.Promise.withResolver = function() {
+  var resolve, reject;
+  var promise = new goog.Promise(function(rs, rj) {
+    resolve = rs;
+    reject = rj;
+  });
+  return new goog.Promise.Resolver_(promise, resolve, reject);
+};
+
+
+/**
+ * Adds callbacks that will operate on the result of the Promise, returning a
+ * new child Promise.
+ *
+ * If the Promise is fulfilled, the {@code onFulfilled} callback will be invoked
+ * with the fulfillment value as argument, and the child Promise will be
+ * fulfilled with the return value of the callback. If the callback throws an
+ * exception, the child Promise will be rejected with the thrown value instead.
+ *
+ * If the Promise is rejected, the {@code onRejected} callback will be invoked
+ * with the rejection reason as argument, and the child Promise will be resolved
+ * with the return value or rejected with the thrown value of the callback.
+ *
+ * @override
+ */
+goog.Promise.prototype.then = function(
+    opt_onFulfilled, opt_onRejected, opt_context) {
+
+  if (opt_onFulfilled != null) {
+    goog.asserts.assertFunction(opt_onFulfilled,
+        'opt_onFulfilled should be a function.');
+  }
+  if (opt_onRejected != null) {
+    goog.asserts.assertFunction(opt_onRejected,
+        'opt_onRejected should be a function. Did you pass opt_context ' +
+        'as the second argument instead of the third?');
+  }
+
+  if (goog.Promise.LONG_STACK_TRACES) {
+    this.addStackTrace_(new Error('then'));
+  }
+
+  return this.addChildPromise_(
+      goog.isFunction(opt_onFulfilled) ? opt_onFulfilled : null,
+      goog.isFunction(opt_onRejected) ? opt_onRejected : null,
+      opt_context);
+};
+goog.Thenable.addImplementation(goog.Promise);
+
+
+/**
+ * Adds callbacks that will operate on the result of the Promise without
+ * returning a child Promise (unlike "then").
+ *
+ * If the Promise is fulfilled, the {@code onFulfilled} callback will be invoked
+ * with the fulfillment value as argument.
+ *
+ * If the Promise is rejected, the {@code onRejected} callback will be invoked
+ * with the rejection reason as argument.
+ *
+ * @param {?(function(this:THIS, TYPE):?)=} opt_onFulfilled A
+ *     function that will be invoked with the fulfillment value if the Promise
+ *     is fulfilled.
+ * @param {?(function(this:THIS, *): *)=} opt_onRejected A function that will
+ *     be invoked with the rejection reason if the Promise is rejected.
+ * @param {THIS=} opt_context An optional context object that will be the
+ *     execution context for the callbacks. By default, functions are executed
+ *     with the default this.
+ * @package
+ * @template THIS
+ */
+goog.Promise.prototype.thenVoid = function(
+    opt_onFulfilled, opt_onRejected, opt_context) {
+
+  if (opt_onFulfilled != null) {
+    goog.asserts.assertFunction(opt_onFulfilled,
+        'opt_onFulfilled should be a function.');
+  }
+  if (opt_onRejected != null) {
+    goog.asserts.assertFunction(opt_onRejected,
+        'opt_onRejected should be a function. Did you pass opt_context ' +
+        'as the second argument instead of the third?');
+  }
+
+  if (goog.Promise.LONG_STACK_TRACES) {
+    this.addStackTrace_(new Error('then'));
+  }
+
+  // Note: no default rejection handler is provided here as we need to
+  // distinguish unhandled rejections.
+  this.addCallbackEntry_(goog.Promise.getCallbackEntry_(
+      opt_onFulfilled || goog.nullFunction,
+      opt_onRejected || null,
+      opt_context));
+};
+
+
+/**
+ * Adds a callback that will be invoked when the Promise is settled (fulfilled
+ * or rejected). The callback receives no argument, and no new child Promise is
+ * created. This is useful for ensuring that cleanup takes place after certain
+ * asynchronous operations. Callbacks added with {@code thenAlways} will be
+ * executed in the same order with other calls to {@code then},
+ * {@code thenAlways}, or {@code thenCatch}.
+ *
+ * Since it does not produce a new child Promise, cancellation propagation is
+ * not prevented by adding callbacks with {@code thenAlways}. A Promise that has
+ * a cleanup handler added with {@code thenAlways} will be canceled if all of
+ * its children created by {@code then} (or {@code thenCatch}) are canceled.
+ * Additionally, since any rejections are not passed to the callback, it does
+ * not stop the unhandled rejection handler from running.
+ *
+ * @param {function(this:THIS): void} onSettled A function that will be invoked
+ *     when the Promise is settled (fulfilled or rejected).
+ * @param {THIS=} opt_context An optional context object that will be the
+ *     execution context for the callbacks. By default, functions are executed
+ *     in the global scope.
+ * @return {!goog.Promise<TYPE>} This Promise, for chaining additional calls.
+ * @template THIS
+ */
+goog.Promise.prototype.thenAlways = function(onSettled, opt_context) {
+  if (goog.Promise.LONG_STACK_TRACES) {
+    this.addStackTrace_(new Error('thenAlways'));
+  }
+
+  var entry = goog.Promise.getCallbackEntry_(onSettled, onSettled, opt_context);
+  entry.always = true;
+  this.addCallbackEntry_(entry);
+  return this;
+};
+
+
+/**
+ * Adds a callback that will be invoked only if the Promise is rejected. This
+ * is equivalent to {@code then(null, onRejected)}.
+ *
+ * @param {!function(this:THIS, *): *} onRejected A function that will be
+ *     invoked with the rejection reason if the Promise is rejected.
+ * @param {THIS=} opt_context An optional context object that will be the
+ *     execution context for the callbacks. By default, functions are executed
+ *     in the global scope.
+ * @return {!goog.Promise} A new Promise that will receive the result of the
+ *     callback.
+ * @template THIS
+ */
+goog.Promise.prototype.thenCatch = function(onRejected, opt_context) {
+  if (goog.Promise.LONG_STACK_TRACES) {
+    this.addStackTrace_(new Error('thenCatch'));
+  }
+  return this.addChildPromise_(null, onRejected, opt_context);
+};
+
+
+/**
+ * Cancels the Promise if it is still pending by rejecting it with a cancel
+ * Error. No action is performed if the Promise is already resolved.
+ *
+ * All child Promises of the canceled Promise will be rejected with the same
+ * cancel error, as with normal Promise rejection. If the Promise to be canceled
+ * is the only child of a pending Promise, the parent Promise will also be
+ * canceled. Cancellation may propagate upward through multiple generations.
+ *
+ * @param {string=} opt_message An optional debugging message for describing the
+ *     cancellation reason.
+ */
+goog.Promise.prototype.cancel = function(opt_message) {
+  if (this.state_ == goog.Promise.State_.PENDING) {
+    goog.async.run(function() {
+      var err = new goog.Promise.CancellationError(opt_message);
+      this.cancelInternal_(err);
+    }, this);
+  }
+};
+
+
+/**
+ * Cancels this Promise with the given error.
+ *
+ * @param {!Error} err The cancellation error.
+ * @private
+ */
+goog.Promise.prototype.cancelInternal_ = function(err) {
+  if (this.state_ == goog.Promise.State_.PENDING) {
+    if (this.parent_) {
+      // Cancel the Promise and remove it from the parent's child list.
+      this.parent_.cancelChild_(this, err);
+      this.parent_ = null;
+    } else {
+      this.resolve_(goog.Promise.State_.REJECTED, err);
+    }
+  }
+};
+
+
+/**
+ * Cancels a child Promise from the list of callback entries. If the Promise has
+ * not already been resolved, reject it with a cancel error. If there are no
+ * other children in the list of callback entries, propagate the cancellation
+ * by canceling this Promise as well.
+ *
+ * @param {!goog.Promise} childPromise The Promise to cancel.
+ * @param {!Error} err The cancel error to use for rejecting the Promise.
+ * @private
+ */
+goog.Promise.prototype.cancelChild_ = function(childPromise, err) {
+  if (!this.callbackEntries_) {
+    return;
+  }
+  var childCount = 0;
+  var childEntry = null;
+  var beforeChildEntry = null;
+
+  // Find the callback entry for the childPromise, and count whether there are
+  // additional child Promises.
+  for (var entry = this.callbackEntries_; entry; entry = entry.next) {
+    if (!entry.always) {
+      childCount++;
+      if (entry.child == childPromise) {
+        childEntry = entry;
+      }
+      if (childEntry && childCount > 1) {
+        break;
+      }
+    }
+    if (!childEntry) {
+      beforeChildEntry = entry;
+    }
+  }
+
+  // Can a child entry be missing?
+
+  // If the child Promise was the only child, cancel this Promise as well.
+  // Otherwise, reject only the child Promise with the cancel error.
+  if (childEntry) {
+    if (this.state_ == goog.Promise.State_.PENDING && childCount == 1) {
+      this.cancelInternal_(err);
+    } else {
+      if (beforeChildEntry) {
+        this.removeEntryAfter_(beforeChildEntry);
+      } else {
+        this.popEntry_();
+      }
+
+      this.executeCallback_(
+          childEntry, goog.Promise.State_.REJECTED, err);
+    }
+  }
+};
+
+
+/**
+ * Adds a callback entry to the current Promise, and schedules callback
+ * execution if the Promise has already been settled.
+ *
+ * @param {goog.Promise.CallbackEntry_} callbackEntry Record containing
+ *     {@code onFulfilled} and {@code onRejected} callbacks to execute after
+ *     the Promise is settled.
+ * @private
+ */
+goog.Promise.prototype.addCallbackEntry_ = function(callbackEntry) {
+  if (!this.hasEntry_() &&
+      (this.state_ == goog.Promise.State_.FULFILLED ||
+       this.state_ == goog.Promise.State_.REJECTED)) {
+    this.scheduleCallbacks_();
+  }
+  this.queueEntry_(callbackEntry);
+};
+
+
+/**
+ * Creates a child Promise and adds it to the callback entry list. The result of
+ * the child Promise is determined by the state of the parent Promise and the
+ * result of the {@code onFulfilled} or {@code onRejected} callbacks as
+ * specified in the Promise resolution procedure.
+ *
+ * @see http://promisesaplus.com/#the__method
+ *
+ * @param {?function(this:THIS, TYPE):
+ *          (RESULT|goog.Promise<RESULT>|Thenable)} onFulfilled A callback that
+ *     will be invoked if the Promise is fullfilled, or null.
+ * @param {?function(this:THIS, *): *} onRejected A callback that will be
+ *     invoked if the Promise is rejected, or null.
+ * @param {THIS=} opt_context An optional execution context for the callbacks.
+ *     in the default calling context.
+ * @return {!goog.Promise} The child Promise.
+ * @template RESULT,THIS
+ * @private
+ */
+goog.Promise.prototype.addChildPromise_ = function(
+    onFulfilled, onRejected, opt_context) {
+
+  /** @type {goog.Promise.CallbackEntry_} */
+  var callbackEntry = goog.Promise.getCallbackEntry_(null, null, null);
+
+  callbackEntry.child = new goog.Promise(function(resolve, reject) {
+    // Invoke onFulfilled, or resolve with the parent's value if absent.
+    callbackEntry.onFulfilled = onFulfilled ? function(value) {
+      try {
+        var result = onFulfilled.call(opt_context, value);
+        resolve(result);
+      } catch (err) {
+        reject(err);
+      }
+    } : resolve;
+
+    // Invoke onRejected, or reject with the parent's reason if absent.
+    callbackEntry.onRejected = onRejected ? function(reason) {
+      try {
+        var result = onRejected.call(opt_context, reason);
+        if (!goog.isDef(result) &&
+            reason instanceof goog.Promise.CancellationError) {
+          // Propagate cancellation to children if no other result is returned.
+          reject(reason);
+        } else {
+          resolve(result);
+        }
+      } catch (err) {
+        reject(err);
+      }
+    } : reject;
+  });
+
+  callbackEntry.child.parent_ = this;
+  this.addCallbackEntry_(callbackEntry);
+  return callbackEntry.child;
+};
+
+
+/**
+ * Unblocks the Promise and fulfills it with the given value.
+ *
+ * @param {TYPE} value
+ * @private
+ */
+goog.Promise.prototype.unblockAndFulfill_ = function(value) {
+  goog.asserts.assert(this.state_ == goog.Promise.State_.BLOCKED);
+  this.state_ = goog.Promise.State_.PENDING;
+  this.resolve_(goog.Promise.State_.FULFILLED, value);
+};
+
+
+/**
+ * Unblocks the Promise and rejects it with the given rejection reason.
+ *
+ * @param {*} reason
+ * @private
+ */
+goog.Promise.prototype.unblockAndReject_ = function(reason) {
+  goog.asserts.assert(this.state_ == goog.Promise.State_.BLOCKED);
+  this.state_ = goog.Promise.State_.PENDING;
+  this.resolve_(goog.Promise.State_.REJECTED, reason);
+};
+
+
+/**
+ * Attempts to resolve a Promise with a given resolution state and value. This
+ * is a no-op if the given Promise has already been resolved.
+ *
+ * If the given result is a Thenable (such as another Promise), the Promise will
+ * be settled with the same state and result as the Thenable once it is itself
+ * settled.
+ *
+ * If the given result is not a Thenable, the Promise will be settled (fulfilled
+ * or rejected) with that result based on the given state.
+ *
+ * @see http://promisesaplus.com/#the_promise_resolution_procedure
+ *
+ * @param {goog.Promise.State_} state
+ * @param {*} x The result to apply to the Promise.
+ * @private
+ */
+goog.Promise.prototype.resolve_ = function(state, x) {
+  if (this.state_ != goog.Promise.State_.PENDING) {
+    return;
+  }
+
+  if (this == x) {
+    state = goog.Promise.State_.REJECTED;
+    x = new TypeError('Promise cannot resolve to itself');
+  }
+
+  this.state_ = goog.Promise.State_.BLOCKED;
+  var isThenable = goog.Promise.maybeThen_(
+      x, this.unblockAndFulfill_, this.unblockAndReject_, this);
+  if (isThenable) {
+    return;
+  }
+
+  this.result_ = x;
+  this.state_ = state;
+  // Since we can no longer be canceled, remove link to parent, so that the
+  // child promise does not keep the parent promise alive.
+  this.parent_ = null;
+  this.scheduleCallbacks_();
+
+  if (state == goog.Promise.State_.REJECTED &&
+      !(x instanceof goog.Promise.CancellationError)) {
+    goog.Promise.addUnhandledRejection_(this, x);
+  }
+};
+
+
+/**
+ * Invokes the "then" method of an input value if that value is a Thenable. This
+ * is a no-op if the value is not thenable.
+ *
+ * @param {*} value A potentially thenable value.
+ * @param {!Function} onFulfilled
+ * @param {!Function} onRejected
+ * @param {*} context
+ * @return {boolean} Whether the input value was thenable.
+ * @private
+ */
+goog.Promise.maybeThen_ = function(value, onFulfilled, onRejected, context) {
+  if (value instanceof goog.Promise) {
+    value.thenVoid(onFulfilled, onRejected, context);
+    return true;
+  } else if (goog.Thenable.isImplementedBy(value)) {
+    value = /** @type {!goog.Thenable} */ (value);
+    value.then(onFulfilled, onRejected, context);
+    return true;
+  } else if (goog.isObject(value)) {
+    try {
+      var then = value['then'];
+      if (goog.isFunction(then)) {
+        goog.Promise.tryThen_(
+            value, then, onFulfilled, onRejected, context);
+        return true;
+      }
+    } catch (e) {
+      onRejected.call(context, e);
+      return true;
+    }
+  }
+
+  return false;
+};
+
+
+/**
+ * Attempts to call the {@code then} method on an object in the hopes that it is
+ * a Promise-compatible instance. This allows interoperation between different
+ * Promise implementations, however a non-compliant object may cause a Promise
+ * to hang indefinitely. If the {@code then} method throws an exception, the
+ * dependent Promise will be rejected with the thrown value.
+ *
+ * @see http://promisesaplus.com/#point-70
+ *
+ * @param {Thenable} thenable An object with a {@code then} method that may be
+ *     compatible with the Promise/A+ specification.
+ * @param {!Function} then The {@code then} method of the Thenable object.
+ * @param {!Function} onFulfilled
+ * @param {!Function} onRejected
+ * @param {*} context
+ * @private
+ */
+goog.Promise.tryThen_ = function(
+    thenable, then, onFulfilled, onRejected, context) {
+
+  var called = false;
+  var resolve = function(value) {
+    if (!called) {
+      called = true;
+      onFulfilled.call(context, value);
+    }
+  };
+
+  var reject = function(reason) {
+    if (!called) {
+      called = true;
+      onRejected.call(context, reason);
+    }
+  };
+
+  try {
+    then.call(thenable, resolve, reject);
+  } catch (e) {
+    reject(e);
+  }
+};
+
+
+/**
+ * Executes the pending callbacks of a settled Promise after a timeout.
+ *
+ * Section 2.2.4 of the Promises/A+ specification requires that Promise
+ * callbacks must only be invoked from a call stack that only contains Promise
+ * implementation code, which we accomplish by invoking callback execution after
+ * a timeout. If {@code startExecution_} is called multiple times for the same
+ * Promise, the callback chain will be evaluated only once. Additional callbacks
+ * may be added during the evaluation phase, and will be executed in the same
+ * event loop.
+ *
+ * All Promises added to the waiting list during the same browser event loop
+ * will be executed in one batch to avoid using a separate timeout per Promise.
+ *
+ * @private
+ */
+goog.Promise.prototype.scheduleCallbacks_ = function() {
+  if (!this.executing_) {
+    this.executing_ = true;
+    goog.async.run(this.executeCallbacks_, this);
+  }
+};
+
+
+/**
+ * @return {boolean} Whether there are any pending callbacks queued.
+ * @private
+ */
+goog.Promise.prototype.hasEntry_ = function() {
+  return !!this.callbackEntries_;
+};
+
+
+/**
+ * @param {goog.Promise.CallbackEntry_} entry
+ * @private
+ */
+goog.Promise.prototype.queueEntry_ = function(entry) {
+  goog.asserts.assert(entry.onFulfilled != null);
+
+  if (this.callbackEntriesTail_) {
+    this.callbackEntriesTail_.next = entry;
+    this.callbackEntriesTail_ = entry;
+  } else {
+    // It the work queue was empty set the head too.
+    this.callbackEntries_ = entry;
+    this.callbackEntriesTail_ = entry;
+  }
+};
+
+
+/**
+ * @return {goog.Promise.CallbackEntry_} entry
+ * @private
+ */
+goog.Promise.prototype.popEntry_ = function() {
+  var entry = null;
+  if (this.callbackEntries_) {
+    entry = this.callbackEntries_;
+    this.callbackEntries_ = entry.next;
+    entry.next = null;
+  }
+  // It the work queue is empty clear the tail too.
+  if (!this.callbackEntries_) {
+    this.callbackEntriesTail_ = null;
+  }
+
+  if (entry != null) {
+    goog.asserts.assert(entry.onFulfilled != null);
+  }
+  return entry;
+};
+
+
+/**
+ * @param {goog.Promise.CallbackEntry_} previous
+ * @private
+ */
+goog.Promise.prototype.removeEntryAfter_ = function(previous) {
+  goog.asserts.assert(this.callbackEntries_);
+  goog.asserts.assert(previous != null);
+  // If the last entry is being removed, update the tail
+  if (previous.next == this.callbackEntriesTail_) {
+    this.callbackEntriesTail_ = previous;
+  }
+
+  previous.next = previous.next.next;
+};
+
+
+/**
+ * Executes all pending callbacks for this Promise.
+ *
+ * @private
+ */
+goog.Promise.prototype.executeCallbacks_ = function() {
+  var entry = null;
+  while (entry = this.popEntry_()) {
+    if (goog.Promise.LONG_STACK_TRACES) {
+      this.currentStep_++;
+    }
+    this.executeCallback_(entry, this.state_, this.result_);
+  }
+  this.executing_ = false;
+};
+
+
+/**
+ * Executes a pending callback for this Promise. Invokes an {@code onFulfilled}
+ * or {@code onRejected} callback based on the settled state of the Promise.
+ *
+ * @param {!goog.Promise.CallbackEntry_} callbackEntry An entry containing the
+ *     onFulfilled and/or onRejected callbacks for this step.
+ * @param {goog.Promise.State_} state The resolution status of the Promise,
+ *     either FULFILLED or REJECTED.
+ * @param {*} result The settled result of the Promise.
+ * @private
+ */
+goog.Promise.prototype.executeCallback_ = function(
+    callbackEntry, state, result) {
+  // Cancel an unhandled rejection if the then/thenVoid call had an onRejected.
+  if (state == goog.Promise.State_.REJECTED &&
+      callbackEntry.onRejected && !callbackEntry.always) {
+    this.removeUnhandledRejection_();
+  }
+
+  if (callbackEntry.child) {
+    // When the parent is settled, the child no longer needs to hold on to it,
+    // as the parent can no longer be canceled.
+    callbackEntry.child.parent_ = null;
+    goog.Promise.invokeCallback_(callbackEntry, state, result);
+  } else {
+    // Callbacks created with thenAlways or thenVoid do not have the rejection
+    // handling code normally set up in the child Promise.
+    try {
+      callbackEntry.always ?
+          callbackEntry.onFulfilled.call(callbackEntry.context) :
+          goog.Promise.invokeCallback_(callbackEntry, state, result);
+    } catch (err) {
+      goog.Promise.handleRejection_.call(null, err);
+    }
+  }
+  goog.Promise.returnEntry_(callbackEntry);
+};
+
+
+/**
+ * Executes the onFulfilled or onRejected callback for a callbackEntry.
+ *
+ * @param {!goog.Promise.CallbackEntry_} callbackEntry
+ * @param {goog.Promise.State_} state
+ * @param {*} result
+ * @private
+ */
+goog.Promise.invokeCallback_ = function(callbackEntry, state, result) {
+  if (state == goog.Promise.State_.FULFILLED) {
+    callbackEntry.onFulfilled.call(callbackEntry.context, result);
+  } else if (callbackEntry.onRejected) {
+    callbackEntry.onRejected.call(callbackEntry.context, result);
+  }
+};
+
+
+/**
+ * Records a stack trace entry for functions that call {@code then} or the
+ * Promise constructor. May be disabled by unsetting {@code LONG_STACK_TRACES}.
+ *
+ * @param {!Error} err An Error object created by the calling function for
+ *     providing a stack trace.
+ * @private
+ */
+goog.Promise.prototype.addStackTrace_ = function(err) {
+  if (goog.Promise.LONG_STACK_TRACES && goog.isString(err.stack)) {
+    // Extract the third line of the stack trace, which is the entry for the
+    // user function that called into Promise code.
+    var trace = err.stack.split('\n', 4)[3];
+    var message = err.message;
+
+    // Pad the message to align the traces.
+    message += Array(11 - message.length).join(' ');
+    this.stack_.push(message + trace);
+  }
+};
+
+
+/**
+ * Adds extra stack trace information to an exception for the list of
+ * asynchronous {@code then} calls that have been run for this Promise. Stack
+ * trace information is recorded in {@see #addStackTrace_}, and appended to
+ * rethrown errors when {@code LONG_STACK_TRACES} is enabled.
+ *
+ * @param {*} err An unhandled exception captured during callback execution.
+ * @private
+ */
+goog.Promise.prototype.appendLongStack_ = function(err) {
+  if (goog.Promise.LONG_STACK_TRACES &&
+      err && goog.isString(err.stack) && this.stack_.length) {
+    var longTrace = ['Promise trace:'];
+
+    for (var promise = this; promise; promise = promise.parent_) {
+      for (var i = this.currentStep_; i >= 0; i--) {
+        longTrace.push(promise.stack_[i]);
+      }
+      longTrace.push('Value: ' +
+          '[' + (promise.state_ == goog.Promise.State_.REJECTED ?
+              'REJECTED' : 'FULFILLED') + '] ' +
+          '<' + String(promise.result_) + '>');
+    }
+    err.stack += '\n\n' + longTrace.join('\n');
+  }
+};
+
+
+/**
+ * Marks this rejected Promise as having being handled. Also marks any parent
+ * Promises in the rejected state as handled. The rejection handler will no
+ * longer be invoked for this Promise (if it has not been called already).
+ *
+ * @private
+ */
+goog.Promise.prototype.removeUnhandledRejection_ = function() {
+  if (goog.Promise.UNHANDLED_REJECTION_DELAY > 0) {
+    for (var p = this; p && p.unhandledRejectionId_; p = p.parent_) {
+      goog.global.clearTimeout(p.unhandledRejectionId_);
+      p.unhandledRejectionId_ = 0;
+    }
+  } else if (goog.Promise.UNHANDLED_REJECTION_DELAY == 0) {
+    for (var p = this; p && p.hadUnhandledRejection_; p = p.parent_) {
+      p.hadUnhandledRejection_ = false;
+    }
+  }
+};
+
+
+/**
+ * Marks this rejected Promise as unhandled. If no {@code onRejected} callback
+ * is called for this Promise before the {@code UNHANDLED_REJECTION_DELAY}
+ * expires, the reason will be passed to the unhandled rejection handler. The
+ * handler typically rethrows the rejection reason so that it becomes visible in
+ * the developer console.
+ *
+ * @param {!goog.Promise} promise The rejected Promise.
+ * @param {*} reason The Promise rejection reason.
+ * @private
+ */
+goog.Promise.addUnhandledRejection_ = function(promise, reason) {
+  if (goog.Promise.UNHANDLED_REJECTION_DELAY > 0) {
+    promise.unhandledRejectionId_ = goog.global.setTimeout(function() {
+      promise.appendLongStack_(reason);
+      goog.Promise.handleRejection_.call(null, reason);
+    }, goog.Promise.UNHANDLED_REJECTION_DELAY);
+
+  } else if (goog.Promise.UNHANDLED_REJECTION_DELAY == 0) {
+    promise.hadUnhandledRejection_ = true;
+    goog.async.run(function() {
+      if (promise.hadUnhandledRejection_) {
+        promise.appendLongStack_(reason);
+        goog.Promise.handleRejection_.call(null, reason);
+      }
+    });
+  }
+};
+
+
+/**
+ * A method that is invoked with the rejection reasons for Promises that are
+ * rejected but have no {@code onRejected} callbacks registered yet.
+ * @type {function(*)}
+ * @private
+ */
+goog.Promise.handleRejection_ = goog.async.throwException;
+
+
+/**
+ * Sets a handler that will be called with reasons from unhandled rejected
+ * Promises. If the rejected Promise (or one of its descendants) has an
+ * {@code onRejected} callback registered, the rejection will be considered
+ * handled, and the rejection handler will not be called.
+ *
+ * By default, unhandled rejections are rethrown so that the error may be
+ * captured by the developer console or a {@code window.onerror} handler.
+ *
+ * @param {function(*)} handler A function that will be called with reasons from
+ *     rejected Promises. Defaults to {@code goog.async.throwException}.
+ */
+goog.Promise.setUnhandledRejectionHandler = function(handler) {
+  goog.Promise.handleRejection_ = handler;
+};
+
+
+
+/**
+ * Error used as a rejection reason for canceled Promises.
+ *
+ * @param {string=} opt_message
+ * @constructor
+ * @extends {goog.debug.Error}
+ * @final
+ */
+goog.Promise.CancellationError = function(opt_message) {
+  goog.Promise.CancellationError.base(this, 'constructor', opt_message);
+};
+goog.inherits(goog.Promise.CancellationError, goog.debug.Error);
+
+
+/** @override */
+goog.Promise.CancellationError.prototype.name = 'cancel';
+
+
+
+/**
+ * Internal implementation of the resolver interface.
+ *
+ * @param {!goog.Promise<TYPE>} promise
+ * @param {function((TYPE|goog.Promise<TYPE>|Thenable)=)} resolve
+ * @param {function(*=): void} reject
+ * @implements {goog.promise.Resolver<TYPE>}
+ * @final @struct
+ * @constructor
+ * @private
+ * @template TYPE
+ */
+goog.Promise.Resolver_ = function(promise, resolve, reject) {
+  /** @const */
+  this.promise = promise;
+
+  /** @const */
+  this.resolve = resolve;
+
+  /** @const */
+  this.reject = reject;
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview A timer class to which other classes and objects can
+ * listen on.  This is only an abstraction above setInterval.
+ *
+ * @see ../demos/timers.html
+ */
+
+goog.provide('goog.Timer');
+
+goog.require('goog.Promise');
+goog.require('goog.events.EventTarget');
+
+
+
+/**
+ * Class for handling timing events.
+ *
+ * @param {number=} opt_interval Number of ms between ticks (Default: 1ms).
+ * @param {Object=} opt_timerObject  An object that has setTimeout, setInterval,
+ *     clearTimeout and clearInterval (eg Window).
+ * @constructor
+ * @extends {goog.events.EventTarget}
+ */
+goog.Timer = function(opt_interval, opt_timerObject) {
+  goog.events.EventTarget.call(this);
+
+  /**
+   * Number of ms between ticks
+   * @type {number}
+   * @private
+   */
+  this.interval_ = opt_interval || 1;
+
+  /**
+   * An object that implements setTimeout, setInterval, clearTimeout and
+   * clearInterval. We default to the window object. Changing this on
+   * goog.Timer.prototype changes the object for all timer instances which can
+   * be useful if your environment has some other implementation of timers than
+   * the window object.
+   * @type {Object}
+   * @private
+   */
+  this.timerObject_ = opt_timerObject || goog.Timer.defaultTimerObject;
+
+  /**
+   * Cached tick_ bound to the object for later use in the timer.
+   * @type {Function}
+   * @private
+   */
+  this.boundTick_ = goog.bind(this.tick_, this);
+
+  /**
+   * Firefox browser often fires the timer event sooner
+   * (sometimes MUCH sooner) than the requested timeout. So we
+   * compare the time to when the event was last fired, and
+   * reschedule if appropriate. See also goog.Timer.intervalScale
+   * @type {number}
+   * @private
+   */
+  this.last_ = goog.now();
+};
+goog.inherits(goog.Timer, goog.events.EventTarget);
+
+
+/**
+ * Maximum timeout value.
+ *
+ * Timeout values too big to fit into a signed 32-bit integer may cause
+ * overflow in FF, Safari, and Chrome, resulting in the timeout being
+ * scheduled immediately.  It makes more sense simply not to schedule these
+ * timeouts, since 24.8 days is beyond a reasonable expectation for the
+ * browser to stay open.
+ *
+ * @type {number}
+ * @private
+ */
+goog.Timer.MAX_TIMEOUT_ = 2147483647;
+
+
+/**
+ * A timer ID that cannot be returned by any known implmentation of
+ * Window.setTimeout.  Passing this value to window.clearTimeout should
+ * therefore be a no-op.
+ *
+ * @const {number}
+ * @private
+ */
+goog.Timer.INVALID_TIMEOUT_ID_ = -1;
+
+
+/**
+ * Whether this timer is enabled
+ * @type {boolean}
+ */
+goog.Timer.prototype.enabled = false;
+
+
+/**
+ * An object that implements setTimout, setInterval, clearTimeout and
+ * clearInterval. We default to the global object. Changing
+ * goog.Timer.defaultTimerObject changes the object for all timer instances
+ * which can be useful if your environment has some other implementation of
+ * timers you'd like to use.
+ * @type {Object}
+ */
+goog.Timer.defaultTimerObject = goog.global;
+
+
+/**
+ * A variable that controls the timer error correction. If the
+ * timer is called before the requested interval times
+ * intervalScale, which often happens on mozilla, the timer is
+ * rescheduled. See also this.last_
+ * @type {number}
+ */
+goog.Timer.intervalScale = 0.8;
+
+
+/**
+ * Variable for storing the result of setInterval
+ * @type {?number}
+ * @private
+ */
+goog.Timer.prototype.timer_ = null;
+
+
+/**
+ * Gets the interval of the timer.
+ * @return {number} interval Number of ms between ticks.
+ */
+goog.Timer.prototype.getInterval = function() {
+  return this.interval_;
+};
+
+
+/**
+ * Sets the interval of the timer.
+ * @param {number} interval Number of ms between ticks.
+ */
+goog.Timer.prototype.setInterval = function(interval) {
+  this.interval_ = interval;
+  if (this.timer_ && this.enabled) {
+    // Stop and then start the timer to reset the interval.
+    this.stop();
+    this.start();
+  } else if (this.timer_) {
+    this.stop();
+  }
+};
+
+
+/**
+ * Callback for the setTimeout used by the timer
+ * @private
+ */
+goog.Timer.prototype.tick_ = function() {
+  if (this.enabled) {
+    var elapsed = goog.now() - this.last_;
+    if (elapsed > 0 &&
+        elapsed < this.interval_ * goog.Timer.intervalScale) {
+      this.timer_ = this.timerObject_.setTimeout(this.boundTick_,
+          this.interval_ - elapsed);
+      return;
+    }
+
+    // Prevents setInterval from registering a duplicate timeout when called
+    // in the timer event handler.
+    if (this.timer_) {
+      this.timerObject_.clearTimeout(this.timer_);
+      this.timer_ = null;
+    }
+
+    this.dispatchTick();
+    // The timer could be stopped in the timer event handler.
+    if (this.enabled) {
+      this.timer_ = this.timerObject_.setTimeout(this.boundTick_,
+          this.interval_);
+      this.last_ = goog.now();
+    }
+  }
+};
+
+
+/**
+ * Dispatches the TICK event. This is its own method so subclasses can override.
+ */
+goog.Timer.prototype.dispatchTick = function() {
+  this.dispatchEvent(goog.Timer.TICK);
+};
+
+
+/**
+ * Starts the timer.
+ */
+goog.Timer.prototype.start = function() {
+  this.enabled = true;
+
+  // If there is no interval already registered, start it now
+  if (!this.timer_) {
+    // IMPORTANT!
+    // window.setInterval in FireFox has a bug - it fires based on
+    // absolute time, rather than on relative time. What this means
+    // is that if a computer is sleeping/hibernating for 24 hours
+    // and the timer interval was configured to fire every 1000ms,
+    // then after the PC wakes up the timer will fire, in rapid
+    // succession, 3600*24 times.
+    // This bug is described here and is already fixed, but it will
+    // take time to propagate, so for now I am switching this over
+    // to setTimeout logic.
+    //     https://bugzilla.mozilla.org/show_bug.cgi?id=376643
+    //
+    this.timer_ = this.timerObject_.setTimeout(this.boundTick_,
+        this.interval_);
+    this.last_ = goog.now();
+  }
+};
+
+
+/**
+ * Stops the timer.
+ */
+goog.Timer.prototype.stop = function() {
+  this.enabled = false;
+  if (this.timer_) {
+    this.timerObject_.clearTimeout(this.timer_);
+    this.timer_ = null;
+  }
+};
+
+
+/** @override */
+goog.Timer.prototype.disposeInternal = function() {
+  goog.Timer.superClass_.disposeInternal.call(this);
+  this.stop();
+  delete this.timerObject_;
+};
+
+
+/**
+ * Constant for the timer's event type
+ * @type {string}
+ */
+goog.Timer.TICK = 'tick';
+
+
+/**
+ * Calls the given function once, after the optional pause.
+ *
+ * The function is always called asynchronously, even if the delay is 0. This
+ * is a common trick to schedule a function to run after a batch of browser
+ * event processing.
+ *
+ * @param {function(this:SCOPE)|{handleEvent:function()}|null} listener Function
+ *     or object that has a handleEvent method.
+ * @param {number=} opt_delay Milliseconds to wait; default is 0.
+ * @param {SCOPE=} opt_handler Object in whose scope to call the listener.
+ * @return {number} A handle to the timer ID.
+ * @template SCOPE
+ */
+goog.Timer.callOnce = function(listener, opt_delay, opt_handler) {
+  if (goog.isFunction(listener)) {
+    if (opt_handler) {
+      listener = goog.bind(listener, opt_handler);
+    }
+  } else if (listener && typeof listener.handleEvent == 'function') {
+    // using typeof to prevent strict js warning
+    listener = goog.bind(listener.handleEvent, listener);
+  } else {
+    throw Error('Invalid listener argument');
+  }
+
+  if (opt_delay > goog.Timer.MAX_TIMEOUT_) {
+    // Timeouts greater than MAX_INT return immediately due to integer
+    // overflow in many browsers.  Since MAX_INT is 24.8 days, just don't
+    // schedule anything at all.
+    return goog.Timer.INVALID_TIMEOUT_ID_;
+  } else {
+    return goog.Timer.defaultTimerObject.setTimeout(
+        listener, opt_delay || 0);
+  }
+};
+
+
+/**
+ * Clears a timeout initiated by callOnce
+ * @param {?number} timerId a timer ID.
+ */
+goog.Timer.clear = function(timerId) {
+  goog.Timer.defaultTimerObject.clearTimeout(timerId);
+};
+
+
+/**
+ * @param {number} delay Milliseconds to wait.
+ * @param {(RESULT|goog.Thenable<RESULT>|Thenable)=} opt_result The value
+ *     with which the promise will be resolved.
+ * @return {!goog.Promise<RESULT>} A promise that will be resolved after
+ *     the specified delay, unless it is canceled first.
+ * @template RESULT
+ */
+goog.Timer.promise = function(delay, opt_result) {
+  var timerKey = null;
+  return new goog.Promise(function(resolve, reject) {
+    timerKey = goog.Timer.callOnce(function() {
+      resolve(opt_result);
+    }, delay);
+    if (timerKey == goog.Timer.INVALID_TIMEOUT_ID_) {
+      reject(new Error('Failed to schedule timer.'));
+    }
+  }).thenCatch(function(error) {
+    // Clear the timer. The most likely reason is "cancel" signal.
+    goog.Timer.clear(timerKey);
+    throw error;
+  });
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview JSON utility functions.
+ * @author arv@google.com (Erik Arvidsson)
+ */
+
+
+goog.provide('goog.json');
+goog.provide('goog.json.Replacer');
+goog.provide('goog.json.Reviver');
+goog.provide('goog.json.Serializer');
+
+
+/**
+ * @define {boolean} If true, use the native JSON parsing API.
+ * NOTE(ruilopes): EXPERIMENTAL, handle with care.  Setting this to true might
+ * break your code.  The default {@code goog.json.parse} implementation is able
+ * to handle invalid JSON, such as JSPB.
+ */
+goog.define('goog.json.USE_NATIVE_JSON', false);
+
+
+/**
+ * Tests if a string is an invalid JSON string. This only ensures that we are
+ * not using any invalid characters
+ * @param {string} s The string to test.
+ * @return {boolean} True if the input is a valid JSON string.
+ */
+goog.json.isValid = function(s) {
+  // All empty whitespace is not valid.
+  if (/^\s*$/.test(s)) {
+    return false;
+  }
+
+  // This is taken from http://www.json.org/json2.js which is released to the
+  // public domain.
+  // Changes: We dissallow \u2028 Line separator and \u2029 Paragraph separator
+  // inside strings.  We also treat \u2028 and \u2029 as whitespace which they
+  // are in the RFC but IE and Safari does not match \s to these so we need to
+  // include them in the reg exps in all places where whitespace is allowed.
+  // We allowed \x7f inside strings because some tools don't escape it,
+  // e.g. http://www.json.org/java/org/json/JSONObject.java
+
+  // Parsing happens in three stages. In the first stage, we run the text
+  // against regular expressions that look for non-JSON patterns. We are
+  // especially concerned with '()' and 'new' because they can cause invocation,
+  // and '=' because it can cause mutation. But just to be safe, we want to
+  // reject all unexpected forms.
+
+  // We split the first stage into 4 regexp operations in order to work around
+  // crippling inefficiencies in IE's and Safari's regexp engines. First we
+  // replace all backslash pairs with '@' (a non-JSON character). Second, we
+  // replace all simple value tokens with ']' characters. Third, we delete all
+  // open brackets that follow a colon or comma or that begin the text. Finally,
+  // we look to see that the remaining characters are only whitespace or ']' or
+  // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
+
+  // Don't make these static since they have the global flag.
+  var backslashesRe = /\\["\\\/bfnrtu]/g;
+  var simpleValuesRe =
+      /"[^"\\\n\r\u2028\u2029\x00-\x08\x0a-\x1f]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g;
+  var openBracketsRe = /(?:^|:|,)(?:[\s\u2028\u2029]*\[)+/g;
+  var remainderRe = /^[\],:{}\s\u2028\u2029]*$/;
+
+  return remainderRe.test(s.replace(backslashesRe, '@').
+      replace(simpleValuesRe, ']').
+      replace(openBracketsRe, ''));
+};
+
+
+/**
+ * Parses a JSON string and returns the result. This throws an exception if
+ * the string is an invalid JSON string.
+ *
+ * Note that this is very slow on large strings. If you trust the source of
+ * the string then you should use unsafeParse instead.
+ *
+ * @param {*} s The JSON string to parse.
+ * @throws Error if s is invalid JSON.
+ * @return {Object} The object generated from the JSON string, or null.
+ */
+goog.json.parse = goog.json.USE_NATIVE_JSON ?
+    /** @type {function(*):Object} */ (goog.global['JSON']['parse']) :
+    function(s) {
+      var o = String(s);
+      if (goog.json.isValid(o)) {
+        /** @preserveTry */
+        try {
+          return /** @type {Object} */ (eval('(' + o + ')'));
+        } catch (ex) {
+        }
+      }
+      throw Error('Invalid JSON string: ' + o);
+    };
+
+
+/**
+ * Parses a JSON string and returns the result. This uses eval so it is open
+ * to security issues and it should only be used if you trust the source.
+ *
+ * @param {string} s The JSON string to parse.
+ * @return {Object} The object generated from the JSON string.
+ */
+goog.json.unsafeParse = goog.json.USE_NATIVE_JSON ?
+    /** @type {function(string):Object} */ (goog.global['JSON']['parse']) :
+    function(s) {
+      return /** @type {Object} */ (eval('(' + s + ')'));
+    };
+
+
+/**
+ * JSON replacer, as defined in Section 15.12.3 of the ES5 spec.
+ * @see http://ecma-international.org/ecma-262/5.1/#sec-15.12.3
+ *
+ * TODO(nicksantos): Array should also be a valid replacer.
+ *
+ * @typedef {function(this:Object, string, *): *}
+ */
+goog.json.Replacer;
+
+
+/**
+ * JSON reviver, as defined in Section 15.12.2 of the ES5 spec.
+ * @see http://ecma-international.org/ecma-262/5.1/#sec-15.12.3
+ *
+ * @typedef {function(this:Object, string, *): *}
+ */
+goog.json.Reviver;
+
+
+/**
+ * Serializes an object or a value to a JSON string.
+ *
+ * @param {*} object The object to serialize.
+ * @param {?goog.json.Replacer=} opt_replacer A replacer function
+ *     called for each (key, value) pair that determines how the value
+ *     should be serialized. By defult, this just returns the value
+ *     and allows default serialization to kick in.
+ * @throws Error if there are loops in the object graph.
+ * @return {string} A JSON string representation of the input.
+ */
+goog.json.serialize = goog.json.USE_NATIVE_JSON ?
+    /** @type {function(*, ?goog.json.Replacer=):string} */
+    (goog.global['JSON']['stringify']) :
+    function(object, opt_replacer) {
+      // NOTE(nicksantos): Currently, we never use JSON.stringify.
+      //
+      // The last time I evaluated this, JSON.stringify had subtle bugs and
+      // behavior differences on all browsers, and the performance win was not
+      // large enough to justify all the issues. This may change in the future
+      // as browser implementations get better.
+      //
+      // assertSerialize in json_test contains if branches for the cases
+      // that fail.
+      return new goog.json.Serializer(opt_replacer).serialize(object);
+    };
+
+
+
+/**
+ * Class that is used to serialize JSON objects to a string.
+ * @param {?goog.json.Replacer=} opt_replacer Replacer.
+ * @constructor
+ */
+goog.json.Serializer = function(opt_replacer) {
+  /**
+   * @type {goog.json.Replacer|null|undefined}
+   * @private
+   */
+  this.replacer_ = opt_replacer;
+};
+
+
+/**
+ * Serializes an object or a value to a JSON string.
+ *
+ * @param {*} object The object to serialize.
+ * @throws Error if there are loops in the object graph.
+ * @return {string} A JSON string representation of the input.
+ */
+goog.json.Serializer.prototype.serialize = function(object) {
+  var sb = [];
+  this.serializeInternal(object, sb);
+  return sb.join('');
+};
+
+
+/**
+ * Serializes a generic value to a JSON string
+ * @protected
+ * @param {*} object The object to serialize.
+ * @param {Array<string>} sb Array used as a string builder.
+ * @throws Error if there are loops in the object graph.
+ */
+goog.json.Serializer.prototype.serializeInternal = function(object, sb) {
+  if (object == null) {
+    // undefined == null so this branch covers undefined as well as null
+    sb.push('null');
+    return;
+  }
+
+  if (typeof object == 'object') {
+    if (goog.isArray(object)) {
+      this.serializeArray(object, sb);
+      return;
+    } else if (object instanceof String ||
+               object instanceof Number ||
+               object instanceof Boolean) {
+      object = object.valueOf();
+      // Fall through to switch below.
+    } else {
+      this.serializeObject_(/** @type {Object} */ (object), sb);
+      return;
+    }
+  }
+
+  switch (typeof object) {
+    case 'string':
+      this.serializeString_(object, sb);
+      break;
+    case 'number':
+      this.serializeNumber_(object, sb);
+      break;
+    case 'boolean':
+      sb.push(object);
+      break;
+    case 'function':
+      sb.push('null');
+      break;
+    default:
+      throw Error('Unknown type: ' + typeof object);
+  }
+};
+
+
+/**
+ * Character mappings used internally for goog.string.quote
+ * @private
+ * @type {!Object}
+ */
+goog.json.Serializer.charToJsonCharCache_ = {
+  '\"': '\\"',
+  '\\': '\\\\',
+  '/': '\\/',
+  '\b': '\\b',
+  '\f': '\\f',
+  '\n': '\\n',
+  '\r': '\\r',
+  '\t': '\\t',
+
+  '\x0B': '\\u000b' // '\v' is not supported in JScript
+};
+
+
+/**
+ * Regular expression used to match characters that need to be replaced.
+ * The S60 browser has a bug where unicode characters are not matched by
+ * regular expressions. The condition below detects such behaviour and
+ * adjusts the regular expression accordingly.
+ * @private
+ * @type {!RegExp}
+ */
+goog.json.Serializer.charsToReplace_ = /\uffff/.test('\uffff') ?
+    /[\\\"\x00-\x1f\x7f-\uffff]/g : /[\\\"\x00-\x1f\x7f-\xff]/g;
+
+
+/**
+ * Serializes a string to a JSON string
+ * @private
+ * @param {string} s The string to serialize.
+ * @param {Array<string>} sb Array used as a string builder.
+ */
+goog.json.Serializer.prototype.serializeString_ = function(s, sb) {
+  // The official JSON implementation does not work with international
+  // characters.
+  sb.push('"', s.replace(goog.json.Serializer.charsToReplace_, function(c) {
+    // caching the result improves performance by a factor 2-3
+    var rv = goog.json.Serializer.charToJsonCharCache_[c];
+    if (!rv) {
+      rv = '\\u' + (c.charCodeAt(0) | 0x10000).toString(16).substr(1);
+      goog.json.Serializer.charToJsonCharCache_[c] = rv;
+    }
+    return rv;
+  }), '"');
+};
+
+
+/**
+ * Serializes a number to a JSON string
+ * @private
+ * @param {number} n The number to serialize.
+ * @param {Array<string>} sb Array used as a string builder.
+ */
+goog.json.Serializer.prototype.serializeNumber_ = function(n, sb) {
+  sb.push(isFinite(n) && !isNaN(n) ? n : 'null');
+};
+
+
+/**
+ * Serializes an array to a JSON string
+ * @param {Array<string>} arr The array to serialize.
+ * @param {Array<string>} sb Array used as a string builder.
+ * @protected
+ */
+goog.json.Serializer.prototype.serializeArray = function(arr, sb) {
+  var l = arr.length;
+  sb.push('[');
+  var sep = '';
+  for (var i = 0; i < l; i++) {
+    sb.push(sep);
+
+    var value = arr[i];
+    this.serializeInternal(
+        this.replacer_ ? this.replacer_.call(arr, String(i), value) : value,
+        sb);
+
+    sep = ',';
+  }
+  sb.push(']');
+};
+
+
+/**
+ * Serializes an object to a JSON string
+ * @private
+ * @param {Object} obj The object to serialize.
+ * @param {Array<string>} sb Array used as a string builder.
+ */
+goog.json.Serializer.prototype.serializeObject_ = function(obj, sb) {
+  sb.push('{');
+  var sep = '';
+  for (var key in obj) {
+    if (Object.prototype.hasOwnProperty.call(obj, key)) {
+      var value = obj[key];
+      // Skip functions.
+      if (typeof value != 'function') {
+        sb.push(sep);
+        this.serializeString_(key, sb);
+        sb.push(':');
+
+        this.serializeInternal(
+            this.replacer_ ? this.replacer_.call(obj, key, value) : value,
+            sb);
+
+        sep = ',';
+      }
+    }
+  }
+  sb.push('}');
+};
+
+// Copyright 2007 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Error codes shared between goog.net.IframeIo and
+ * goog.net.XhrIo.
+ */
+
+goog.provide('goog.net.ErrorCode');
+
+
+/**
+ * Error codes
+ * @enum {number}
+ */
+goog.net.ErrorCode = {
+
+  /**
+   * There is no error condition.
+   */
+  NO_ERROR: 0,
+
+  /**
+   * The most common error from iframeio, unfortunately, is that the browser
+   * responded with an error page that is classed as a different domain. The
+   * situations, are when a browser error page  is shown -- 404, access denied,
+   * DNS failure, connection reset etc.)
+   *
+   */
+  ACCESS_DENIED: 1,
+
+  /**
+   * Currently the only case where file not found will be caused is when the
+   * code is running on the local file system and a non-IE browser makes a
+   * request to a file that doesn't exist.
+   */
+  FILE_NOT_FOUND: 2,
+
+  /**
+   * If Firefox shows a browser error page, such as a connection reset by
+   * server or access denied, then it will fail silently without the error or
+   * load handlers firing.
+   */
+  FF_SILENT_ERROR: 3,
+
+  /**
+   * Custom error provided by the client through the error check hook.
+   */
+  CUSTOM_ERROR: 4,
+
+  /**
+   * Exception was thrown while processing the request.
+   */
+  EXCEPTION: 5,
+
+  /**
+   * The Http response returned a non-successful http status code.
+   */
+  HTTP_ERROR: 6,
+
+  /**
+   * The request was aborted.
+   */
+  ABORT: 7,
+
+  /**
+   * The request timed out.
+   */
+  TIMEOUT: 8,
+
+  /**
+   * The resource is not available offline.
+   */
+  OFFLINE: 9
+};
+
+
+/**
+ * Returns a friendly error message for an error code. These messages are for
+ * debugging and are not localized.
+ * @param {goog.net.ErrorCode} errorCode An error code.
+ * @return {string} A message for debugging.
+ */
+goog.net.ErrorCode.getDebugMessage = function(errorCode) {
+  switch (errorCode) {
+    case goog.net.ErrorCode.NO_ERROR:
+      return 'No Error';
+
+    case goog.net.ErrorCode.ACCESS_DENIED:
+      return 'Access denied to content document';
+
+    case goog.net.ErrorCode.FILE_NOT_FOUND:
+      return 'File not found';
+
+    case goog.net.ErrorCode.FF_SILENT_ERROR:
+      return 'Firefox silently errored';
+
+    case goog.net.ErrorCode.CUSTOM_ERROR:
+      return 'Application custom error';
+
+    case goog.net.ErrorCode.EXCEPTION:
+      return 'An exception occurred';
+
+    case goog.net.ErrorCode.HTTP_ERROR:
+      return 'Http response at 400 or 500 level';
+
+    case goog.net.ErrorCode.ABORT:
+      return 'Request was aborted';
+
+    case goog.net.ErrorCode.TIMEOUT:
+      return 'Request timed out';
+
+    case goog.net.ErrorCode.OFFLINE:
+      return 'The resource is not available offline';
+
+    default:
+      return 'Unrecognized error code';
+  }
+};
+
+// Copyright 2011 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Constants for HTTP status codes.
+ */
+
+goog.provide('goog.net.HttpStatus');
+
+
+/**
+ * HTTP Status Codes defined in RFC 2616 and RFC 6585.
+ * @see http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
+ * @see http://tools.ietf.org/html/rfc6585
+ * @enum {number}
+ */
+goog.net.HttpStatus = {
+  // Informational 1xx
+  CONTINUE: 100,
+  SWITCHING_PROTOCOLS: 101,
+
+  // Successful 2xx
+  OK: 200,
+  CREATED: 201,
+  ACCEPTED: 202,
+  NON_AUTHORITATIVE_INFORMATION: 203,
+  NO_CONTENT: 204,
+  RESET_CONTENT: 205,
+  PARTIAL_CONTENT: 206,
+
+  // Redirection 3xx
+  MULTIPLE_CHOICES: 300,
+  MOVED_PERMANENTLY: 301,
+  FOUND: 302,
+  SEE_OTHER: 303,
+  NOT_MODIFIED: 304,
+  USE_PROXY: 305,
+  TEMPORARY_REDIRECT: 307,
+
+  // Client Error 4xx
+  BAD_REQUEST: 400,
+  UNAUTHORIZED: 401,
+  PAYMENT_REQUIRED: 402,
+  FORBIDDEN: 403,
+  NOT_FOUND: 404,
+  METHOD_NOT_ALLOWED: 405,
+  NOT_ACCEPTABLE: 406,
+  PROXY_AUTHENTICATION_REQUIRED: 407,
+  REQUEST_TIMEOUT: 408,
+  CONFLICT: 409,
+  GONE: 410,
+  LENGTH_REQUIRED: 411,
+  PRECONDITION_FAILED: 412,
+  REQUEST_ENTITY_TOO_LARGE: 413,
+  REQUEST_URI_TOO_LONG: 414,
+  UNSUPPORTED_MEDIA_TYPE: 415,
+  REQUEST_RANGE_NOT_SATISFIABLE: 416,
+  EXPECTATION_FAILED: 417,
+  PRECONDITION_REQUIRED: 428,
+  TOO_MANY_REQUESTS: 429,
+  REQUEST_HEADER_FIELDS_TOO_LARGE: 431,
+
+  // Server Error 5xx
+  INTERNAL_SERVER_ERROR: 500,
+  NOT_IMPLEMENTED: 501,
+  BAD_GATEWAY: 502,
+  SERVICE_UNAVAILABLE: 503,
+  GATEWAY_TIMEOUT: 504,
+  HTTP_VERSION_NOT_SUPPORTED: 505,
+  NETWORK_AUTHENTICATION_REQUIRED: 511,
+
+  /*
+   * IE returns this code for 204 due to its use of URLMon, which returns this
+   * code for 'Operation Aborted'. The status text is 'Unknown', the response
+   * headers are ''. Known to occur on IE 6 on XP through IE9 on Win7.
+   */
+  QUIRK_IE_NO_CONTENT: 1223
+};
+
+
+/**
+ * Returns whether the given status should be considered successful.
+ *
+ * Successful codes are OK (200), CREATED (201), ACCEPTED (202),
+ * NO CONTENT (204), PARTIAL CONTENT (206), NOT MODIFIED (304),
+ * and IE's no content code (1223).
+ *
+ * @param {number} status The status code to test.
+ * @return {boolean} Whether the status code should be considered successful.
+ */
+goog.net.HttpStatus.isSuccess = function(status) {
+  switch (status) {
+    case goog.net.HttpStatus.OK:
+    case goog.net.HttpStatus.CREATED:
+    case goog.net.HttpStatus.ACCEPTED:
+    case goog.net.HttpStatus.NO_CONTENT:
+    case goog.net.HttpStatus.PARTIAL_CONTENT:
+    case goog.net.HttpStatus.NOT_MODIFIED:
+    case goog.net.HttpStatus.QUIRK_IE_NO_CONTENT:
+      return true;
+
+    default:
+      return false;
+  }
+};
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+goog.provide('goog.net.XhrLike');
+
+
+
+/**
+ * Interface for the common parts of XMLHttpRequest.
+ *
+ * Mostly copied from externs/w3c_xml.js.
+ *
+ * @interface
+ * @see http://www.w3.org/TR/XMLHttpRequest/
+ */
+goog.net.XhrLike = function() {};
+
+
+/**
+ * Typedef that refers to either native or custom-implemented XHR objects.
+ * @typedef {!goog.net.XhrLike|!XMLHttpRequest}
+ */
+goog.net.XhrLike.OrNative;
+
+
+/**
+ * @type {function()|null|undefined}
+ * @see http://www.w3.org/TR/XMLHttpRequest/#handler-xhr-onreadystatechange
+ */
+goog.net.XhrLike.prototype.onreadystatechange;
+
+
+/**
+ * @type {string}
+ * @see http://www.w3.org/TR/XMLHttpRequest/#the-responsetext-attribute
+ */
+goog.net.XhrLike.prototype.responseText;
+
+
+/**
+ * @type {Document}
+ * @see http://www.w3.org/TR/XMLHttpRequest/#the-responsexml-attribute
+ */
+goog.net.XhrLike.prototype.responseXML;
+
+
+/**
+ * @type {number}
+ * @see http://www.w3.org/TR/XMLHttpRequest/#readystate
+ */
+goog.net.XhrLike.prototype.readyState;
+
+
+/**
+ * @type {number}
+ * @see http://www.w3.org/TR/XMLHttpRequest/#status
+ */
+goog.net.XhrLike.prototype.status;
+
+
+/**
+ * @type {string}
+ * @see http://www.w3.org/TR/XMLHttpRequest/#statustext
+ */
+goog.net.XhrLike.prototype.statusText;
+
+
+/**
+ * @param {string} method
+ * @param {string} url
+ * @param {?boolean=} opt_async
+ * @param {?string=} opt_user
+ * @param {?string=} opt_password
+ * @see http://www.w3.org/TR/XMLHttpRequest/#the-open()-method
+ */
+goog.net.XhrLike.prototype.open = function(method, url, opt_async, opt_user,
+    opt_password) {};
+
+
+/**
+ * @param {ArrayBuffer|ArrayBufferView|Blob|Document|FormData|string=} opt_data
+ * @see http://www.w3.org/TR/XMLHttpRequest/#the-send()-method
+ */
+goog.net.XhrLike.prototype.send = function(opt_data) {};
+
+
+/**
+ * @see http://www.w3.org/TR/XMLHttpRequest/#the-abort()-method
+ */
+goog.net.XhrLike.prototype.abort = function() {};
+
+
+/**
+ * @param {string} header
+ * @param {string} value
+ * @see http://www.w3.org/TR/XMLHttpRequest/#the-setrequestheader()-method
+ */
+goog.net.XhrLike.prototype.setRequestHeader = function(header, value) {};
+
+
+/**
+ * @param {string} header
+ * @return {string}
+ * @see http://www.w3.org/TR/XMLHttpRequest/#the-getresponseheader()-method
+ */
+goog.net.XhrLike.prototype.getResponseHeader = function(header) {};
+
+
+/**
+ * @return {string}
+ * @see http://www.w3.org/TR/XMLHttpRequest/#the-getallresponseheaders()-method
+ */
+goog.net.XhrLike.prototype.getAllResponseHeaders = function() {};
+
+// Copyright 2010 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Interface for a factory for creating XMLHttpRequest objects
+ * and metadata about them.
+ * @author dbk@google.com (David Barrett-Kahn)
+ */
+
+goog.provide('goog.net.XmlHttpFactory');
+
+/** @suppress {extraRequire} Typedef. */
+goog.require('goog.net.XhrLike');
+
+
+
+/**
+ * Abstract base class for an XmlHttpRequest factory.
+ * @constructor
+ */
+goog.net.XmlHttpFactory = function() {
+};
+
+
+/**
+ * Cache of options - we only actually call internalGetOptions once.
+ * @type {Object}
+ * @private
+ */
+goog.net.XmlHttpFactory.prototype.cachedOptions_ = null;
+
+
+/**
+ * @return {!goog.net.XhrLike.OrNative} A new XhrLike instance.
+ */
+goog.net.XmlHttpFactory.prototype.createInstance = goog.abstractMethod;
+
+
+/**
+ * @return {Object} Options describing how xhr objects obtained from this
+ *     factory should be used.
+ */
+goog.net.XmlHttpFactory.prototype.getOptions = function() {
+  return this.cachedOptions_ ||
+      (this.cachedOptions_ = this.internalGetOptions());
+};
+
+
+/**
+ * Override this method in subclasses to preserve the caching offered by
+ * getOptions().
+ * @return {Object} Options describing how xhr objects obtained from this
+ *     factory should be used.
+ * @protected
+ */
+goog.net.XmlHttpFactory.prototype.internalGetOptions = goog.abstractMethod;
+
+// Copyright 2010 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Implementation of XmlHttpFactory which allows construction from
+ * simple factory methods.
+ * @author dbk@google.com (David Barrett-Kahn)
+ */
+
+goog.provide('goog.net.WrapperXmlHttpFactory');
+
+/** @suppress {extraRequire} Typedef. */
+goog.require('goog.net.XhrLike');
+goog.require('goog.net.XmlHttpFactory');
+
+
+
+/**
+ * An xhr factory subclass which can be constructed using two factory methods.
+ * This exists partly to allow the preservation of goog.net.XmlHttp.setFactory()
+ * with an unchanged signature.
+ * @param {function():!goog.net.XhrLike.OrNative} xhrFactory
+ *     A function which returns a new XHR object.
+ * @param {function():!Object} optionsFactory A function which returns the
+ *     options associated with xhr objects from this factory.
+ * @extends {goog.net.XmlHttpFactory}
+ * @constructor
+ * @final
+ */
+goog.net.WrapperXmlHttpFactory = function(xhrFactory, optionsFactory) {
+  goog.net.XmlHttpFactory.call(this);
+
+  /**
+   * XHR factory method.
+   * @type {function() : !goog.net.XhrLike.OrNative}
+   * @private
+   */
+  this.xhrFactory_ = xhrFactory;
+
+  /**
+   * Options factory method.
+   * @type {function() : !Object}
+   * @private
+   */
+  this.optionsFactory_ = optionsFactory;
+};
+goog.inherits(goog.net.WrapperXmlHttpFactory, goog.net.XmlHttpFactory);
+
+
+/** @override */
+goog.net.WrapperXmlHttpFactory.prototype.createInstance = function() {
+  return this.xhrFactory_();
+};
+
+
+/** @override */
+goog.net.WrapperXmlHttpFactory.prototype.getOptions = function() {
+  return this.optionsFactory_();
+};
+
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Low level handling of XMLHttpRequest.
+ * @author arv@google.com (Erik Arvidsson)
+ * @author dbk@google.com (David Barrett-Kahn)
+ */
+
+goog.provide('goog.net.DefaultXmlHttpFactory');
+goog.provide('goog.net.XmlHttp');
+goog.provide('goog.net.XmlHttp.OptionType');
+goog.provide('goog.net.XmlHttp.ReadyState');
+goog.provide('goog.net.XmlHttpDefines');
+
+goog.require('goog.asserts');
+goog.require('goog.net.WrapperXmlHttpFactory');
+goog.require('goog.net.XmlHttpFactory');
+
+
+/**
+ * Static class for creating XMLHttpRequest objects.
+ * @return {!goog.net.XhrLike.OrNative} A new XMLHttpRequest object.
+ */
+goog.net.XmlHttp = function() {
+  return goog.net.XmlHttp.factory_.createInstance();
+};
+
+
+/**
+ * @define {boolean} Whether to assume XMLHttpRequest exists. Setting this to
+ *     true bypasses the ActiveX probing code.
+ * NOTE(ruilopes): Due to the way JSCompiler works, this define *will not* strip
+ * out the ActiveX probing code from binaries.  To achieve this, use
+ * {@code goog.net.XmlHttpDefines.ASSUME_NATIVE_XHR} instead.
+ * TODO(ruilopes): Collapse both defines.
+ */
+goog.define('goog.net.XmlHttp.ASSUME_NATIVE_XHR', false);
+
+
+/** @const */
+goog.net.XmlHttpDefines = {};
+
+
+/**
+ * @define {boolean} Whether to assume XMLHttpRequest exists. Setting this to
+ *     true eliminates the ActiveX probing code.
+ */
+goog.define('goog.net.XmlHttpDefines.ASSUME_NATIVE_XHR', false);
+
+
+/**
+ * Gets the options to use with the XMLHttpRequest objects obtained using
+ * the static methods.
+ * @return {Object} The options.
+ */
+goog.net.XmlHttp.getOptions = function() {
+  return goog.net.XmlHttp.factory_.getOptions();
+};
+
+
+/**
+ * Type of options that an XmlHttp object can have.
+ * @enum {number}
+ */
+goog.net.XmlHttp.OptionType = {
+  /**
+   * Whether a goog.nullFunction should be used to clear the onreadystatechange
+   * handler instead of null.
+   */
+  USE_NULL_FUNCTION: 0,
+
+  /**
+   * NOTE(user): In IE if send() errors on a *local* request the readystate
+   * is still changed to COMPLETE.  We need to ignore it and allow the
+   * try/catch around send() to pick up the error.
+   */
+  LOCAL_REQUEST_ERROR: 1
+};
+
+
+/**
+ * Status constants for XMLHTTP, matches:
+ * http://msdn.microsoft.com/library/default.asp?url=/library/
+ *   en-us/xmlsdk/html/0e6a34e4-f90c-489d-acff-cb44242fafc6.asp
+ * @enum {number}
+ */
+goog.net.XmlHttp.ReadyState = {
+  /**
+   * Constant for when xmlhttprequest.readyState is uninitialized
+   */
+  UNINITIALIZED: 0,
+
+  /**
+   * Constant for when xmlhttprequest.readyState is loading.
+   */
+  LOADING: 1,
+
+  /**
+   * Constant for when xmlhttprequest.readyState is loaded.
+   */
+  LOADED: 2,
+
+  /**
+   * Constant for when xmlhttprequest.readyState is in an interactive state.
+   */
+  INTERACTIVE: 3,
+
+  /**
+   * Constant for when xmlhttprequest.readyState is completed
+   */
+  COMPLETE: 4
+};
+
+
+/**
+ * The global factory instance for creating XMLHttpRequest objects.
+ * @type {goog.net.XmlHttpFactory}
+ * @private
+ */
+goog.net.XmlHttp.factory_;
+
+
+/**
+ * Sets the factories for creating XMLHttpRequest objects and their options.
+ * @param {Function} factory The factory for XMLHttpRequest objects.
+ * @param {Function} optionsFactory The factory for options.
+ * @deprecated Use setGlobalFactory instead.
+ */
+goog.net.XmlHttp.setFactory = function(factory, optionsFactory) {
+  goog.net.XmlHttp.setGlobalFactory(new goog.net.WrapperXmlHttpFactory(
+      goog.asserts.assert(factory),
+      goog.asserts.assert(optionsFactory)));
+};
+
+
+/**
+ * Sets the global factory object.
+ * @param {!goog.net.XmlHttpFactory} factory New global factory object.
+ */
+goog.net.XmlHttp.setGlobalFactory = function(factory) {
+  goog.net.XmlHttp.factory_ = factory;
+};
+
+
+
+/**
+ * Default factory to use when creating xhr objects.  You probably shouldn't be
+ * instantiating this directly, but rather using it via goog.net.XmlHttp.
+ * @extends {goog.net.XmlHttpFactory}
+ * @constructor
+ */
+goog.net.DefaultXmlHttpFactory = function() {
+  goog.net.XmlHttpFactory.call(this);
+};
+goog.inherits(goog.net.DefaultXmlHttpFactory, goog.net.XmlHttpFactory);
+
+
+/** @override */
+goog.net.DefaultXmlHttpFactory.prototype.createInstance = function() {
+  var progId = this.getProgId_();
+  if (progId) {
+    return new ActiveXObject(progId);
+  } else {
+    return new XMLHttpRequest();
+  }
+};
+
+
+/** @override */
+goog.net.DefaultXmlHttpFactory.prototype.internalGetOptions = function() {
+  var progId = this.getProgId_();
+  var options = {};
+  if (progId) {
+    options[goog.net.XmlHttp.OptionType.USE_NULL_FUNCTION] = true;
+    options[goog.net.XmlHttp.OptionType.LOCAL_REQUEST_ERROR] = true;
+  }
+  return options;
+};
+
+
+/**
+ * The ActiveX PROG ID string to use to create xhr's in IE. Lazily initialized.
+ * @type {string|undefined}
+ * @private
+ */
+goog.net.DefaultXmlHttpFactory.prototype.ieProgId_;
+
+
+/**
+ * Initialize the private state used by other functions.
+ * @return {string} The ActiveX PROG ID string to use to create xhr's in IE.
+ * @private
+ */
+goog.net.DefaultXmlHttpFactory.prototype.getProgId_ = function() {
+  if (goog.net.XmlHttp.ASSUME_NATIVE_XHR ||
+      goog.net.XmlHttpDefines.ASSUME_NATIVE_XHR) {
+    return '';
+  }
+
+  // The following blog post describes what PROG IDs to use to create the
+  // XMLHTTP object in Internet Explorer:
+  // http://blogs.msdn.com/xmlteam/archive/2006/10/23/using-the-right-version-of-msxml-in-internet-explorer.aspx
+  // However we do not (yet) fully trust that this will be OK for old versions
+  // of IE on Win9x so we therefore keep the last 2.
+  if (!this.ieProgId_ && typeof XMLHttpRequest == 'undefined' &&
+      typeof ActiveXObject != 'undefined') {
+    // Candidate Active X types.
+    var ACTIVE_X_IDENTS = ['MSXML2.XMLHTTP.6.0', 'MSXML2.XMLHTTP.3.0',
+                           'MSXML2.XMLHTTP', 'Microsoft.XMLHTTP'];
+    for (var i = 0; i < ACTIVE_X_IDENTS.length; i++) {
+      var candidate = ACTIVE_X_IDENTS[i];
+      /** @preserveTry */
+      try {
+        new ActiveXObject(candidate);
+        // NOTE(user): cannot assign progid and return candidate in one line
+        // because JSCompiler complaings: BUG 658126
+        this.ieProgId_ = candidate;
+        return candidate;
+      } catch (e) {
+        // do nothing; try next choice
+      }
+    }
+
+    // couldn't find any matches
+    throw Error('Could not create ActiveXObject. ActiveX might be disabled,' +
+                ' or MSXML might not be installed');
+  }
+
+  return /** @type {string} */ (this.ieProgId_);
+};
+
+
+//Set the global factory to an instance of the default factory.
+goog.net.XmlHttp.setGlobalFactory(new goog.net.DefaultXmlHttpFactory());
+
+// Copyright 2008 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Simple utilities for dealing with URI strings.
+ *
+ * This is intended to be a lightweight alternative to constructing goog.Uri
+ * objects.  Whereas goog.Uri adds several kilobytes to the binary regardless
+ * of how much of its functionality you use, this is designed to be a set of
+ * mostly-independent utilities so that the compiler includes only what is
+ * necessary for the task.  Estimated savings of porting is 5k pre-gzip and
+ * 1.5k post-gzip.  To ensure the savings remain, future developers should
+ * avoid adding new functionality to existing functions, but instead create
+ * new ones and factor out shared code.
+ *
+ * Many of these utilities have limited functionality, tailored to common
+ * cases.  The query parameter utilities assume that the parameter keys are
+ * already encoded, since most keys are compile-time alphanumeric strings.  The
+ * query parameter mutation utilities also do not tolerate fragment identifiers.
+ *
+ * By design, these functions can be slower than goog.Uri equivalents.
+ * Repeated calls to some of functions may be quadratic in behavior for IE,
+ * although the effect is somewhat limited given the 2kb limit.
+ *
+ * One advantage of the limited functionality here is that this approach is
+ * less sensitive to differences in URI encodings than goog.Uri, since these
+ * functions operate on strings directly, rather than decoding them and
+ * then re-encoding.
+ *
+ * Uses features of RFC 3986 for parsing/formatting URIs:
+ *   http://www.ietf.org/rfc/rfc3986.txt
+ *
+ * @author gboyer@google.com (Garrett Boyer) - The "lightened" design.
+ */
+
+goog.provide('goog.uri.utils');
+goog.provide('goog.uri.utils.ComponentIndex');
+goog.provide('goog.uri.utils.QueryArray');
+goog.provide('goog.uri.utils.QueryValue');
+goog.provide('goog.uri.utils.StandardQueryParam');
+
+goog.require('goog.asserts');
+goog.require('goog.string');
+
+
+/**
+ * Character codes inlined to avoid object allocations due to charCode.
+ * @enum {number}
+ * @private
+ */
+goog.uri.utils.CharCode_ = {
+  AMPERSAND: 38,
+  EQUAL: 61,
+  HASH: 35,
+  QUESTION: 63
+};
+
+
+/**
+ * Builds a URI string from already-encoded parts.
+ *
+ * No encoding is performed.  Any component may be omitted as either null or
+ * undefined.
+ *
+ * @param {?string=} opt_scheme The scheme such as 'http'.
+ * @param {?string=} opt_userInfo The user name before the '@'.
+ * @param {?string=} opt_domain The domain such as 'www.google.com', already
+ *     URI-encoded.
+ * @param {(string|number|null)=} opt_port The port number.
+ * @param {?string=} opt_path The path, already URI-encoded.  If it is not
+ *     empty, it must begin with a slash.
+ * @param {?string=} opt_queryData The URI-encoded query data.
+ * @param {?string=} opt_fragment The URI-encoded fragment identifier.
+ * @return {string} The fully combined URI.
+ */
+goog.uri.utils.buildFromEncodedParts = function(opt_scheme, opt_userInfo,
+    opt_domain, opt_port, opt_path, opt_queryData, opt_fragment) {
+  var out = '';
+
+  if (opt_scheme) {
+    out += opt_scheme + ':';
+  }
+
+  if (opt_domain) {
+    out += '//';
+
+    if (opt_userInfo) {
+      out += opt_userInfo + '@';
+    }
+
+    out += opt_domain;
+
+    if (opt_port) {
+      out += ':' + opt_port;
+    }
+  }
+
+  if (opt_path) {
+    out += opt_path;
+  }
+
+  if (opt_queryData) {
+    out += '?' + opt_queryData;
+  }
+
+  if (opt_fragment) {
+    out += '#' + opt_fragment;
+  }
+
+  return out;
+};
+
+
+/**
+ * A regular expression for breaking a URI into its component parts.
+ *
+ * {@link http://www.ietf.org/rfc/rfc3986.txt} says in Appendix B
+ * As the "first-match-wins" algorithm is identical to the "greedy"
+ * disambiguation method used by POSIX regular expressions, it is natural and
+ * commonplace to use a regular expression for parsing the potential five
+ * components of a URI reference.
+ *
+ * The following line is the regular expression for breaking-down a
+ * well-formed URI reference into its components.
+ *
+ * <pre>
+ * ^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?
+ *  12            3  4          5       6  7        8 9
+ * </pre>
+ *
+ * The numbers in the second line above are only to assist readability; they
+ * indicate the reference points for each subexpression (i.e., each paired
+ * parenthesis). We refer to the value matched for subexpression <n> as $<n>.
+ * For example, matching the above expression to
+ * <pre>
+ *     http://www.ics.uci.edu/pub/ietf/uri/#Related
+ * </pre>
+ * results in the following subexpression matches:
+ * <pre>
+ *    $1 = http:
+ *    $2 = http
+ *    $3 = //www.ics.uci.edu
+ *    $4 = www.ics.uci.edu
+ *    $5 = /pub/ietf/uri/
+ *    $6 = <undefined>
+ *    $7 = <undefined>
+ *    $8 = #Related
+ *    $9 = Related
+ * </pre>
+ * where <undefined> indicates that the component is not present, as is the
+ * case for the query component in the above example. Therefore, we can
+ * determine the value of the five components as
+ * <pre>
+ *    scheme    = $2
+ *    authority = $4
+ *    path      = $5
+ *    query     = $7
+ *    fragment  = $9
+ * </pre>
+ *
+ * The regular expression has been modified slightly to expose the
+ * userInfo, domain, and port separately from the authority.
+ * The modified version yields
+ * <pre>
+ *    $1 = http              scheme
+ *    $2 = <undefined>       userInfo -\
+ *    $3 = www.ics.uci.edu   domain     | authority
+ *    $4 = <undefined>       port     -/
+ *    $5 = /pub/ietf/uri/    path
+ *    $6 = <undefined>       query without ?
+ *    $7 = Related           fragment without #
+ * </pre>
+ * @type {!RegExp}
+ * @private
+ */
+goog.uri.utils.splitRe_ = new RegExp(
+    '^' +
+    '(?:' +
+        '([^:/?#.]+)' +                  // scheme - ignore special characters
+                                         // used by other URL parts such as :,
+                                         // ?, /, #, and .
+    ':)?' +
+    '(?://' +
+        '(?:([^/?#]*)@)?' +              // userInfo
+        '([^/#?]*?)' +                   // domain
+        '(?::([0-9]+))?' +               // port
+        '(?=[/#?]|$)' +                  // authority-terminating character
+    ')?' +
+    '([^?#]+)?' +                        // path
+    '(?:\\?([^#]*))?' +                  // query
+    '(?:#(.*))?' +                       // fragment
+    '$');
+
+
+/**
+ * The index of each URI component in the return value of goog.uri.utils.split.
+ * @enum {number}
+ */
+goog.uri.utils.ComponentIndex = {
+  SCHEME: 1,
+  USER_INFO: 2,
+  DOMAIN: 3,
+  PORT: 4,
+  PATH: 5,
+  QUERY_DATA: 6,
+  FRAGMENT: 7
+};
+
+
+/**
+ * Splits a URI into its component parts.
+ *
+ * Each component can be accessed via the component indices; for example:
+ * <pre>
+ * goog.uri.utils.split(someStr)[goog.uri.utils.CompontentIndex.QUERY_DATA];
+ * </pre>
+ *
+ * @param {string} uri The URI string to examine.
+ * @return {!Array<string|undefined>} Each component still URI-encoded.
+ *     Each component that is present will contain the encoded value, whereas
+ *     components that are not present will be undefined or empty, depending
+ *     on the browser's regular expression implementation.  Never null, since
+ *     arbitrary strings may still look like path names.
+ */
+goog.uri.utils.split = function(uri) {
+  // See @return comment -- never null.
+  return /** @type {!Array<string|undefined>} */ (
+      uri.match(goog.uri.utils.splitRe_));
+};
+
+
+/**
+ * @param {?string} uri A possibly null string.
+ * @param {boolean=} opt_preserveReserved If true, percent-encoding of RFC-3986
+ *     reserved characters will not be removed.
+ * @return {?string} The string URI-decoded, or null if uri is null.
+ * @private
+ */
+goog.uri.utils.decodeIfPossible_ = function(uri, opt_preserveReserved) {
+  if (!uri) {
+    return uri;
+  }
+
+  return opt_preserveReserved ? decodeURI(uri) : decodeURIComponent(uri);
+};
+
+
+/**
+ * Gets a URI component by index.
+ *
+ * It is preferred to use the getPathEncoded() variety of functions ahead,
+ * since they are more readable.
+ *
+ * @param {goog.uri.utils.ComponentIndex} componentIndex The component index.
+ * @param {string} uri The URI to examine.
+ * @return {?string} The still-encoded component, or null if the component
+ *     is not present.
+ * @private
+ */
+goog.uri.utils.getComponentByIndex_ = function(componentIndex, uri) {
+  // Convert undefined, null, and empty string into null.
+  return goog.uri.utils.split(uri)[componentIndex] || null;
+};
+
+
+/**
+ * @param {string} uri The URI to examine.
+ * @return {?string} The protocol or scheme, or null if none.  Does not
+ *     include trailing colons or slashes.
+ */
+goog.uri.utils.getScheme = function(uri) {
+  return goog.uri.utils.getComponentByIndex_(
+      goog.uri.utils.ComponentIndex.SCHEME, uri);
+};
+
+
+/**
+ * Gets the effective scheme for the URL.  If the URL is relative then the
+ * scheme is derived from the page's location.
+ * @param {string} uri The URI to examine.
+ * @return {string} The protocol or scheme, always lower case.
+ */
+goog.uri.utils.getEffectiveScheme = function(uri) {
+  var scheme = goog.uri.utils.getScheme(uri);
+  if (!scheme && goog.global.self && goog.global.self.location) {
+    var protocol = goog.global.self.location.protocol;
+    scheme = protocol.substr(0, protocol.length - 1);
+  }
+  // NOTE: When called from a web worker in Firefox 3.5, location maybe null.
+  // All other browsers with web workers support self.location from the worker.
+  return scheme ? scheme.toLowerCase() : '';
+};
+
+
+/**
+ * @param {string} uri The URI to examine.
+ * @return {?string} The user name still encoded, or null if none.
+ */
+goog.uri.utils.getUserInfoEncoded = function(uri) {
+  return goog.uri.utils.getComponentByIndex_(
+      goog.uri.utils.ComponentIndex.USER_INFO, uri);
+};
+
+
+/**
+ * @param {string} uri The URI to examine.
+ * @return {?string} The decoded user info, or null if none.
+ */
+goog.uri.utils.getUserInfo = function(uri) {
+  return goog.uri.utils.decodeIfPossible_(
+      goog.uri.utils.getUserInfoEncoded(uri));
+};
+
+
+/**
+ * @param {string} uri The URI to examine.
+ * @return {?string} The domain name still encoded, or null if none.
+ */
+goog.uri.utils.getDomainEncoded = function(uri) {
+  return goog.uri.utils.getComponentByIndex_(
+      goog.uri.utils.ComponentIndex.DOMAIN, uri);
+};
+
+
+/**
+ * @param {string} uri The URI to examine.
+ * @return {?string} The decoded domain, or null if none.
+ */
+goog.uri.utils.getDomain = function(uri) {
+  return goog.uri.utils.decodeIfPossible_(
+      goog.uri.utils.getDomainEncoded(uri), true /* opt_preserveReserved */);
+};
+
+
+/**
+ * @param {string} uri The URI to examine.
+ * @return {?number} The port number, or null if none.
+ */
+goog.uri.utils.getPort = function(uri) {
+  // Coerce to a number.  If the result of getComponentByIndex_ is null or
+  // non-numeric, the number coersion yields NaN.  This will then return
+  // null for all non-numeric cases (though also zero, which isn't a relevant
+  // port number).
+  return Number(goog.uri.utils.getComponentByIndex_(
+      goog.uri.utils.ComponentIndex.PORT, uri)) || null;
+};
+
+
+/**
+ * @param {string} uri The URI to examine.
+ * @return {?string} The path still encoded, or null if none. Includes the
+ *     leading slash, if any.
+ */
+goog.uri.utils.getPathEncoded = function(uri) {
+  return goog.uri.utils.getComponentByIndex_(
+      goog.uri.utils.ComponentIndex.PATH, uri);
+};
+
+
+/**
+ * @param {string} uri The URI to examine.
+ * @return {?string} The decoded path, or null if none.  Includes the leading
+ *     slash, if any.
+ */
+goog.uri.utils.getPath = function(uri) {
+  return goog.uri.utils.decodeIfPossible_(
+      goog.uri.utils.getPathEncoded(uri), true /* opt_preserveReserved */);
+};
+
+
+/**
+ * @param {string} uri The URI to examine.
+ * @return {?string} The query data still encoded, or null if none.  Does not
+ *     include the question mark itself.
+ */
+goog.uri.utils.getQueryData = function(uri) {
+  return goog.uri.utils.getComponentByIndex_(
+      goog.uri.utils.ComponentIndex.QUERY_DATA, uri);
+};
+
+
+/**
+ * @param {string} uri The URI to examine.
+ * @return {?string} The fragment identifier, or null if none.  Does not
+ *     include the hash mark itself.
+ */
+goog.uri.utils.getFragmentEncoded = function(uri) {
+  // The hash mark may not appear in any other part of the URL.
+  var hashIndex = uri.indexOf('#');
+  return hashIndex < 0 ? null : uri.substr(hashIndex + 1);
+};
+
+
+/**
+ * @param {string} uri The URI to examine.
+ * @param {?string} fragment The encoded fragment identifier, or null if none.
+ *     Does not include the hash mark itself.
+ * @return {string} The URI with the fragment set.
+ */
+goog.uri.utils.setFragmentEncoded = function(uri, fragment) {
+  return goog.uri.utils.removeFragment(uri) + (fragment ? '#' + fragment : '');
+};
+
+
+/**
+ * @param {string} uri The URI to examine.
+ * @return {?string} The decoded fragment identifier, or null if none.  Does
+ *     not include the hash mark.
+ */
+goog.uri.utils.getFragment = function(uri) {
+  return goog.uri.utils.decodeIfPossible_(
+      goog.uri.utils.getFragmentEncoded(uri));
+};
+
+
+/**
+ * Extracts everything up to the port of the URI.
+ * @param {string} uri The URI string.
+ * @return {string} Everything up to and including the port.
+ */
+goog.uri.utils.getHost = function(uri) {
+  var pieces = goog.uri.utils.split(uri);
+  return goog.uri.utils.buildFromEncodedParts(
+      pieces[goog.uri.utils.ComponentIndex.SCHEME],
+      pieces[goog.uri.utils.ComponentIndex.USER_INFO],
+      pieces[goog.uri.utils.ComponentIndex.DOMAIN],
+      pieces[goog.uri.utils.ComponentIndex.PORT]);
+};
+
+
+/**
+ * Extracts the path of the URL and everything after.
+ * @param {string} uri The URI string.
+ * @return {string} The URI, starting at the path and including the query
+ *     parameters and fragment identifier.
+ */
+goog.uri.utils.getPathAndAfter = function(uri) {
+  var pieces = goog.uri.utils.split(uri);
+  return goog.uri.utils.buildFromEncodedParts(null, null, null, null,
+      pieces[goog.uri.utils.ComponentIndex.PATH],
+      pieces[goog.uri.utils.ComponentIndex.QUERY_DATA],
+      pieces[goog.uri.utils.ComponentIndex.FRAGMENT]);
+};
+
+
+/**
+ * Gets the URI with the fragment identifier removed.
+ * @param {string} uri The URI to examine.
+ * @return {string} Everything preceding the hash mark.
+ */
+goog.uri.utils.removeFragment = function(uri) {
+  // The hash mark may not appear in any other part of the URL.
+  var hashIndex = uri.indexOf('#');
+  return hashIndex < 0 ? uri : uri.substr(0, hashIndex);
+};
+
+
+/**
+ * Ensures that two URI's have the exact same domain, scheme, and port.
+ *
+ * Unlike the version in goog.Uri, this checks protocol, and therefore is
+ * suitable for checking against the browser's same-origin policy.
+ *
+ * @param {string} uri1 The first URI.
+ * @param {string} uri2 The second URI.
+ * @return {boolean} Whether they have the same scheme, domain and port.
+ */
+goog.uri.utils.haveSameDomain = function(uri1, uri2) {
+  var pieces1 = goog.uri.utils.split(uri1);
+  var pieces2 = goog.uri.utils.split(uri2);
+  return pieces1[goog.uri.utils.ComponentIndex.DOMAIN] ==
+             pieces2[goog.uri.utils.ComponentIndex.DOMAIN] &&
+         pieces1[goog.uri.utils.ComponentIndex.SCHEME] ==
+             pieces2[goog.uri.utils.ComponentIndex.SCHEME] &&
+         pieces1[goog.uri.utils.ComponentIndex.PORT] ==
+             pieces2[goog.uri.utils.ComponentIndex.PORT];
+};
+
+
+/**
+ * Asserts that there are no fragment or query identifiers, only in uncompiled
+ * mode.
+ * @param {string} uri The URI to examine.
+ * @private
+ */
+goog.uri.utils.assertNoFragmentsOrQueries_ = function(uri) {
+  // NOTE: would use goog.asserts here, but jscompiler doesn't know that
+  // indexOf has no side effects.
+  if (goog.DEBUG && (uri.indexOf('#') >= 0 || uri.indexOf('?') >= 0)) {
+    throw Error('goog.uri.utils: Fragment or query identifiers are not ' +
+        'supported: [' + uri + ']');
+  }
+};
+
+
+/**
+ * Supported query parameter values by the parameter serializing utilities.
+ *
+ * If a value is null or undefined, the key-value pair is skipped, as an easy
+ * way to omit parameters conditionally.  Non-array parameters are converted
+ * to a string and URI encoded.  Array values are expanded into multiple
+ * &key=value pairs, with each element stringized and URI-encoded.
+ *
+ * @typedef {*}
+ */
+goog.uri.utils.QueryValue;
+
+
+/**
+ * An array representing a set of query parameters with alternating keys
+ * and values.
+ *
+ * Keys are assumed to be URI encoded already and live at even indices.  See
+ * goog.uri.utils.QueryValue for details on how parameter values are encoded.
+ *
+ * Example:
+ * <pre>
+ * var data = [
+ *   // Simple param: ?name=BobBarker
+ *   'name', 'BobBarker',
+ *   // Conditional param -- may be omitted entirely.
+ *   'specialDietaryNeeds', hasDietaryNeeds() ? getDietaryNeeds() : null,
+ *   // Multi-valued param: &house=LosAngeles&house=NewYork&house=null
+ *   'house', ['LosAngeles', 'NewYork', null]
+ * ];
+ * </pre>
+ *
+ * @typedef {!Array<string|goog.uri.utils.QueryValue>}
+ */
+goog.uri.utils.QueryArray;
+
+
+/**
+ * Parses encoded query parameters and calls callback function for every
+ * parameter found in the string.
+ *
+ * Missing value of parameter (e.g. “…&key&…”) is treated as if the value was an
+ * empty string.  Keys may be empty strings (e.g. “…&=value&…”) which also means
+ * that “…&=&…” and “…&&…” will result in an empty key and value.
+ *
+ * @param {string} encodedQuery Encoded query string excluding question mark at
+ *     the beginning.
+ * @param {function(string, string)} callback Function called for every
+ *     parameter found in query string.  The first argument (name) will not be
+ *     urldecoded (so the function is consistent with buildQueryData), but the
+ *     second will.  If the parameter has no value (i.e. “=” was not present)
+ *     the second argument (value) will be an empty string.
+ */
+goog.uri.utils.parseQueryData = function(encodedQuery, callback) {
+  if (!encodedQuery) {
+    return;
+  }
+  var pairs = encodedQuery.split('&');
+  for (var i = 0; i < pairs.length; i++) {
+    var indexOfEquals = pairs[i].indexOf('=');
+    var name = null;
+    var value = null;
+    if (indexOfEquals >= 0) {
+      name = pairs[i].substring(0, indexOfEquals);
+      value = pairs[i].substring(indexOfEquals + 1);
+    } else {
+      name = pairs[i];
+    }
+    callback(name, value ? goog.string.urlDecode(value) : '');
+  }
+};
+
+
+/**
+ * Appends a URI and query data in a string buffer with special preconditions.
+ *
+ * Internal implementation utility, performing very few object allocations.
+ *
+ * @param {!Array<string|undefined>} buffer A string buffer.  The first element
+ *     must be the base URI, and may have a fragment identifier.  If the array
+ *     contains more than one element, the second element must be an ampersand,
+ *     and may be overwritten, depending on the base URI.  Undefined elements
+ *     are treated as empty-string.
+ * @return {string} The concatenated URI and query data.
+ * @private
+ */
+goog.uri.utils.appendQueryData_ = function(buffer) {
+  if (buffer[1]) {
+    // At least one query parameter was added.  We need to check the
+    // punctuation mark, which is currently an ampersand, and also make sure
+    // there aren't any interfering fragment identifiers.
+    var baseUri = /** @type {string} */ (buffer[0]);
+    var hashIndex = baseUri.indexOf('#');
+    if (hashIndex >= 0) {
+      // Move the fragment off the base part of the URI into the end.
+      buffer.push(baseUri.substr(hashIndex));
+      buffer[0] = baseUri = baseUri.substr(0, hashIndex);
+    }
+    var questionIndex = baseUri.indexOf('?');
+    if (questionIndex < 0) {
+      // No question mark, so we need a question mark instead of an ampersand.
+      buffer[1] = '?';
+    } else if (questionIndex == baseUri.length - 1) {
+      // Question mark is the very last character of the existing URI, so don't
+      // append an additional delimiter.
+      buffer[1] = undefined;
+    }
+  }
+
+  return buffer.join('');
+};
+
+
+/**
+ * Appends key=value pairs to an array, supporting multi-valued objects.
+ * @param {string} key The key prefix.
+ * @param {goog.uri.utils.QueryValue} value The value to serialize.
+ * @param {!Array<string>} pairs The array to which the 'key=value' strings
+ *     should be appended.
+ * @private
+ */
+goog.uri.utils.appendKeyValuePairs_ = function(key, value, pairs) {
+  if (goog.isArray(value)) {
+    // Convince the compiler it's an array.
+    goog.asserts.assertArray(value);
+    for (var j = 0; j < value.length; j++) {
+      // Convert to string explicitly, to short circuit the null and array
+      // logic in this function -- this ensures that null and undefined get
+      // written as literal 'null' and 'undefined', and arrays don't get
+      // expanded out but instead encoded in the default way.
+      goog.uri.utils.appendKeyValuePairs_(key, String(value[j]), pairs);
+    }
+  } else if (value != null) {
+    // Skip a top-level null or undefined entirely.
+    pairs.push('&', key,
+        // Check for empty string. Zero gets encoded into the url as literal
+        // strings.  For empty string, skip the equal sign, to be consistent
+        // with UriBuilder.java.
+        value === '' ? '' : '=',
+        goog.string.urlEncode(value));
+  }
+};
+
+
+/**
+ * Builds a buffer of query data from a sequence of alternating keys and values.
+ *
+ * @param {!Array<string|undefined>} buffer A string buffer to append to.  The
+ *     first element appended will be an '&', and may be replaced by the caller.
+ * @param {!goog.uri.utils.QueryArray|!Arguments} keysAndValues An array with
+ *     alternating keys and values -- see the typedef.
+ * @param {number=} opt_startIndex A start offset into the arary, defaults to 0.
+ * @return {!Array<string|undefined>} The buffer argument.
+ * @private
+ */
+goog.uri.utils.buildQueryDataBuffer_ = function(
+    buffer, keysAndValues, opt_startIndex) {
+  goog.asserts.assert(Math.max(keysAndValues.length - (opt_startIndex || 0),
+      0) % 2 == 0, 'goog.uri.utils: Key/value lists must be even in length.');
+
+  for (var i = opt_startIndex || 0; i < keysAndValues.length; i += 2) {
+    goog.uri.utils.appendKeyValuePairs_(
+        keysAndValues[i], keysAndValues[i + 1], buffer);
+  }
+
+  return buffer;
+};
+
+
+/**
+ * Builds a query data string from a sequence of alternating keys and values.
+ * Currently generates "&key&" for empty args.
+ *
+ * @param {goog.uri.utils.QueryArray} keysAndValues Alternating keys and
+ *     values.  See the typedef.
+ * @param {number=} opt_startIndex A start offset into the arary, defaults to 0.
+ * @return {string} The encoded query string, in the form 'a=1&b=2'.
+ */
+goog.uri.utils.buildQueryData = function(keysAndValues, opt_startIndex) {
+  var buffer = goog.uri.utils.buildQueryDataBuffer_(
+      [], keysAndValues, opt_startIndex);
+  buffer[0] = ''; // Remove the leading ampersand.
+  return buffer.join('');
+};
+
+
+/**
+ * Builds a buffer of query data from a map.
+ *
+ * @param {!Array<string|undefined>} buffer A string buffer to append to.  The
+ *     first element appended will be an '&', and may be replaced by the caller.
+ * @param {!Object<string, goog.uri.utils.QueryValue>} map An object where keys
+ *     are URI-encoded parameter keys, and the values conform to the contract
+ *     specified in the goog.uri.utils.QueryValue typedef.
+ * @return {!Array<string|undefined>} The buffer argument.
+ * @private
+ */
+goog.uri.utils.buildQueryDataBufferFromMap_ = function(buffer, map) {
+  for (var key in map) {
+    goog.uri.utils.appendKeyValuePairs_(key, map[key], buffer);
+  }
+
+  return buffer;
+};
+
+
+/**
+ * Builds a query data string from a map.
+ * Currently generates "&key&" for empty args.
+ *
+ * @param {!Object<string, goog.uri.utils.QueryValue>} map An object where keys
+ *     are URI-encoded parameter keys, and the values are arbitrary types
+ *     or arrays. Keys with a null value are dropped.
+ * @return {string} The encoded query string, in the form 'a=1&b=2'.
+ */
+goog.uri.utils.buildQueryDataFromMap = function(map) {
+  var buffer = goog.uri.utils.buildQueryDataBufferFromMap_([], map);
+  buffer[0] = '';
+  return buffer.join('');
+};
+
+
+/**
+ * Appends URI parameters to an existing URI.
+ *
+ * The variable arguments may contain alternating keys and values.  Keys are
+ * assumed to be already URI encoded.  The values should not be URI-encoded,
+ * and will instead be encoded by this function.
+ * <pre>
+ * appendParams('http://www.foo.com?existing=true',
+ *     'key1', 'value1',
+ *     'key2', 'value?willBeEncoded',
+ *     'key3', ['valueA', 'valueB', 'valueC'],
+ *     'key4', null);
+ * result: 'http://www.foo.com?existing=true&' +
+ *     'key1=value1&' +
+ *     'key2=value%3FwillBeEncoded&' +
+ *     'key3=valueA&key3=valueB&key3=valueC'
+ * </pre>
+ *
+ * A single call to this function will not exhibit quadratic behavior in IE,
+ * whereas multiple repeated calls may, although the effect is limited by
+ * fact that URL's generally can't exceed 2kb.
+ *
+ * @param {string} uri The original URI, which may already have query data.
+ * @param {...(goog.uri.utils.QueryArray|string|goog.uri.utils.QueryValue)} var_args
+ *     An array or argument list conforming to goog.uri.utils.QueryArray.
+ * @return {string} The URI with all query parameters added.
+ */
+goog.uri.utils.appendParams = function(uri, var_args) {
+  return goog.uri.utils.appendQueryData_(
+      arguments.length == 2 ?
+      goog.uri.utils.buildQueryDataBuffer_([uri], arguments[1], 0) :
+      goog.uri.utils.buildQueryDataBuffer_([uri], arguments, 1));
+};
+
+
+/**
+ * Appends query parameters from a map.
+ *
+ * @param {string} uri The original URI, which may already have query data.
+ * @param {!Object<goog.uri.utils.QueryValue>} map An object where keys are
+ *     URI-encoded parameter keys, and the values are arbitrary types or arrays.
+ *     Keys with a null value are dropped.
+ * @return {string} The new parameters.
+ */
+goog.uri.utils.appendParamsFromMap = function(uri, map) {
+  return goog.uri.utils.appendQueryData_(
+      goog.uri.utils.buildQueryDataBufferFromMap_([uri], map));
+};
+
+
+/**
+ * Appends a single URI parameter.
+ *
+ * Repeated calls to this can exhibit quadratic behavior in IE6 due to the
+ * way string append works, though it should be limited given the 2kb limit.
+ *
+ * @param {string} uri The original URI, which may already have query data.
+ * @param {string} key The key, which must already be URI encoded.
+ * @param {*=} opt_value The value, which will be stringized and encoded
+ *     (assumed not already to be encoded).  If omitted, undefined, or null, the
+ *     key will be added as a valueless parameter.
+ * @return {string} The URI with the query parameter added.
+ */
+goog.uri.utils.appendParam = function(uri, key, opt_value) {
+  var paramArr = [uri, '&', key];
+  if (goog.isDefAndNotNull(opt_value)) {
+    paramArr.push('=', goog.string.urlEncode(opt_value));
+  }
+  return goog.uri.utils.appendQueryData_(paramArr);
+};
+
+
+/**
+ * Finds the next instance of a query parameter with the specified name.
+ *
+ * Does not instantiate any objects.
+ *
+ * @param {string} uri The URI to search.  May contain a fragment identifier
+ *     if opt_hashIndex is specified.
+ * @param {number} startIndex The index to begin searching for the key at.  A
+ *     match may be found even if this is one character after the ampersand.
+ * @param {string} keyEncoded The URI-encoded key.
+ * @param {number} hashOrEndIndex Index to stop looking at.  If a hash
+ *     mark is present, it should be its index, otherwise it should be the
+ *     length of the string.
+ * @return {number} The position of the first character in the key's name,
+ *     immediately after either a question mark or a dot.
+ * @private
+ */
+goog.uri.utils.findParam_ = function(
+    uri, startIndex, keyEncoded, hashOrEndIndex) {
+  var index = startIndex;
+  var keyLength = keyEncoded.length;
+
+  // Search for the key itself and post-filter for surronuding punctuation,
+  // rather than expensively building a regexp.
+  while ((index = uri.indexOf(keyEncoded, index)) >= 0 &&
+      index < hashOrEndIndex) {
+    var precedingChar = uri.charCodeAt(index - 1);
+    // Ensure that the preceding character is '&' or '?'.
+    if (precedingChar == goog.uri.utils.CharCode_.AMPERSAND ||
+        precedingChar == goog.uri.utils.CharCode_.QUESTION) {
+      // Ensure the following character is '&', '=', '#', or NaN
+      // (end of string).
+      var followingChar = uri.charCodeAt(index + keyLength);
+      if (!followingChar ||
+          followingChar == goog.uri.utils.CharCode_.EQUAL ||
+          followingChar == goog.uri.utils.CharCode_.AMPERSAND ||
+          followingChar == goog.uri.utils.CharCode_.HASH) {
+        return index;
+      }
+    }
+    index += keyLength + 1;
+  }
+
+  return -1;
+};
+
+
+/**
+ * Regular expression for finding a hash mark or end of string.
+ * @type {RegExp}
+ * @private
+ */
+goog.uri.utils.hashOrEndRe_ = /#|$/;
+
+
+/**
+ * Determines if the URI contains a specific key.
+ *
+ * Performs no object instantiations.
+ *
+ * @param {string} uri The URI to process.  May contain a fragment
+ *     identifier.
+ * @param {string} keyEncoded The URI-encoded key.  Case-sensitive.
+ * @return {boolean} Whether the key is present.
+ */
+goog.uri.utils.hasParam = function(uri, keyEncoded) {
+  return goog.uri.utils.findParam_(uri, 0, keyEncoded,
+      uri.search(goog.uri.utils.hashOrEndRe_)) >= 0;
+};
+
+
+/**
+ * Gets the first value of a query parameter.
+ * @param {string} uri The URI to process.  May contain a fragment.
+ * @param {string} keyEncoded The URI-encoded key.  Case-sensitive.
+ * @return {?string} The first value of the parameter (URI-decoded), or null
+ *     if the parameter is not found.
+ */
+goog.uri.utils.getParamValue = function(uri, keyEncoded) {
+  var hashOrEndIndex = uri.search(goog.uri.utils.hashOrEndRe_);
+  var foundIndex = goog.uri.utils.findParam_(
+      uri, 0, keyEncoded, hashOrEndIndex);
+
+  if (foundIndex < 0) {
+    return null;
+  } else {
+    var endPosition = uri.indexOf('&', foundIndex);
+    if (endPosition < 0 || endPosition > hashOrEndIndex) {
+      endPosition = hashOrEndIndex;
+    }
+    // Progress forth to the end of the "key=" or "key&" substring.
+    foundIndex += keyEncoded.length + 1;
+    // Use substr, because it (unlike substring) will return empty string
+    // if foundIndex > endPosition.
+    return goog.string.urlDecode(
+        uri.substr(foundIndex, endPosition - foundIndex));
+  }
+};
+
+
+/**
+ * Gets all values of a query parameter.
+ * @param {string} uri The URI to process.  May contain a fragment.
+ * @param {string} keyEncoded The URI-encoded key.  Case-sensitive.
+ * @return {!Array<string>} All URI-decoded values with the given key.
+ *     If the key is not found, this will have length 0, but never be null.
+ */
+goog.uri.utils.getParamValues = function(uri, keyEncoded) {
+  var hashOrEndIndex = uri.search(goog.uri.utils.hashOrEndRe_);
+  var position = 0;
+  var foundIndex;
+  var result = [];
+
+  while ((foundIndex = goog.uri.utils.findParam_(
+      uri, position, keyEncoded, hashOrEndIndex)) >= 0) {
+    // Find where this parameter ends, either the '&' or the end of the
+    // query parameters.
+    position = uri.indexOf('&', foundIndex);
+    if (position < 0 || position > hashOrEndIndex) {
+      position = hashOrEndIndex;
+    }
+
+    // Progress forth to the end of the "key=" or "key&" substring.
+    foundIndex += keyEncoded.length + 1;
+    // Use substr, because it (unlike substring) will return empty string
+    // if foundIndex > position.
+    result.push(goog.string.urlDecode(uri.substr(
+        foundIndex, position - foundIndex)));
+  }
+
+  return result;
+};
+
+
+/**
+ * Regexp to find trailing question marks and ampersands.
+ * @type {RegExp}
+ * @private
+ */
+goog.uri.utils.trailingQueryPunctuationRe_ = /[?&]($|#)/;
+
+
+/**
+ * Removes all instances of a query parameter.
+ * @param {string} uri The URI to process.  Must not contain a fragment.
+ * @param {string} keyEncoded The URI-encoded key.
+ * @return {string} The URI with all instances of the parameter removed.
+ */
+goog.uri.utils.removeParam = function(uri, keyEncoded) {
+  var hashOrEndIndex = uri.search(goog.uri.utils.hashOrEndRe_);
+  var position = 0;
+  var foundIndex;
+  var buffer = [];
+
+  // Look for a query parameter.
+  while ((foundIndex = goog.uri.utils.findParam_(
+      uri, position, keyEncoded, hashOrEndIndex)) >= 0) {
+    // Get the portion of the query string up to, but not including, the ?
+    // or & starting the parameter.
+    buffer.push(uri.substring(position, foundIndex));
+    // Progress to immediately after the '&'.  If not found, go to the end.
+    // Avoid including the hash mark.
+    position = Math.min((uri.indexOf('&', foundIndex) + 1) || hashOrEndIndex,
+        hashOrEndIndex);
+  }
+
+  // Append everything that is remaining.
+  buffer.push(uri.substr(position));
+
+  // Join the buffer, and remove trailing punctuation that remains.
+  return buffer.join('').replace(
+      goog.uri.utils.trailingQueryPunctuationRe_, '$1');
+};
+
+
+/**
+ * Replaces all existing definitions of a parameter with a single definition.
+ *
+ * Repeated calls to this can exhibit quadratic behavior due to the need to
+ * find existing instances and reconstruct the string, though it should be
+ * limited given the 2kb limit.  Consider using appendParams to append multiple
+ * parameters in bulk.
+ *
+ * @param {string} uri The original URI, which may already have query data.
+ * @param {string} keyEncoded The key, which must already be URI encoded.
+ * @param {*} value The value, which will be stringized and encoded (assumed
+ *     not already to be encoded).
+ * @return {string} The URI with the query parameter added.
+ */
+goog.uri.utils.setParam = function(uri, keyEncoded, value) {
+  return goog.uri.utils.appendParam(
+      goog.uri.utils.removeParam(uri, keyEncoded), keyEncoded, value);
+};
+
+
+/**
+ * Generates a URI path using a given URI and a path with checks to
+ * prevent consecutive "//". The baseUri passed in must not contain
+ * query or fragment identifiers. The path to append may not contain query or
+ * fragment identifiers.
+ *
+ * @param {string} baseUri URI to use as the base.
+ * @param {string} path Path to append.
+ * @return {string} Updated URI.
+ */
+goog.uri.utils.appendPath = function(baseUri, path) {
+  goog.uri.utils.assertNoFragmentsOrQueries_(baseUri);
+
+  // Remove any trailing '/'
+  if (goog.string.endsWith(baseUri, '/')) {
+    baseUri = baseUri.substr(0, baseUri.length - 1);
+  }
+  // Remove any leading '/'
+  if (goog.string.startsWith(path, '/')) {
+    path = path.substr(1);
+  }
+  return goog.string.buildString(baseUri, '/', path);
+};
+
+
+/**
+ * Replaces the path.
+ * @param {string} uri URI to use as the base.
+ * @param {string} path New path.
+ * @return {string} Updated URI.
+ */
+goog.uri.utils.setPath = function(uri, path) {
+  // Add any missing '/'.
+  if (!goog.string.startsWith(path, '/')) {
+    path = '/' + path;
+  }
+  var parts = goog.uri.utils.split(uri);
+  return goog.uri.utils.buildFromEncodedParts(
+      parts[goog.uri.utils.ComponentIndex.SCHEME],
+      parts[goog.uri.utils.ComponentIndex.USER_INFO],
+      parts[goog.uri.utils.ComponentIndex.DOMAIN],
+      parts[goog.uri.utils.ComponentIndex.PORT],
+      path,
+      parts[goog.uri.utils.ComponentIndex.QUERY_DATA],
+      parts[goog.uri.utils.ComponentIndex.FRAGMENT]);
+};
+
+
+/**
+ * Standard supported query parameters.
+ * @enum {string}
+ */
+goog.uri.utils.StandardQueryParam = {
+
+  /** Unused parameter for unique-ifying. */
+  RANDOM: 'zx'
+};
+
+
+/**
+ * Sets the zx parameter of a URI to a random value.
+ * @param {string} uri Any URI.
+ * @return {string} That URI with the "zx" parameter added or replaced to
+ *     contain a random string.
+ */
+goog.uri.utils.makeUnique = function(uri) {
+  return goog.uri.utils.setParam(uri,
+      goog.uri.utils.StandardQueryParam.RANDOM, goog.string.getRandomString());
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Wrapper class for handling XmlHttpRequests.
+ *
+ * One off requests can be sent through goog.net.XhrIo.send() or an
+ * instance can be created to send multiple requests.  Each request uses its
+ * own XmlHttpRequest object and handles clearing of the event callback to
+ * ensure no leaks.
+ *
+ * XhrIo is event based, it dispatches events on success, failure, finishing,
+ * ready-state change, or progress.
+ *
+ * The ready-state or timeout event fires first, followed by
+ * a generic completed event. Then the abort, error, or success event
+ * is fired as appropriate. Progress events are fired as they are
+ * received. Lastly, the ready event will fire to indicate that the
+ * object may be used to make another request.
+ *
+ * The error event may also be called before completed and
+ * ready-state-change if the XmlHttpRequest.open() or .send() methods throw.
+ *
+ * This class does not support multiple requests, queuing, or prioritization.
+ *
+ * When progress events are supported by the browser, and progress is
+ * enabled via .setProgressEventsEnabled(true), the
+ * goog.net.EventType.PROGRESS event will be the re-dispatched browser
+ * progress event.
+ *
+ * Tested = IE6, FF1.5, Safari, Opera 8.5
+ *
+ * TODO(user): Error cases aren't playing nicely in Safari.
+ *
+ */
+
+
+goog.provide('goog.net.XhrIo');
+goog.provide('goog.net.XhrIo.ResponseType');
+
+goog.require('goog.Timer');
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.debug.entryPointRegistry');
+goog.require('goog.events.EventTarget');
+goog.require('goog.json');
+goog.require('goog.log');
+goog.require('goog.net.ErrorCode');
+goog.require('goog.net.EventType');
+goog.require('goog.net.HttpStatus');
+goog.require('goog.net.XmlHttp');
+goog.require('goog.object');
+goog.require('goog.string');
+goog.require('goog.structs');
+goog.require('goog.structs.Map');
+goog.require('goog.uri.utils');
+goog.require('goog.userAgent');
+
+goog.forwardDeclare('goog.Uri');
+
+
+
+/**
+ * Basic class for handling XMLHttpRequests.
+ * @param {goog.net.XmlHttpFactory=} opt_xmlHttpFactory Factory to use when
+ *     creating XMLHttpRequest objects.
+ * @constructor
+ * @extends {goog.events.EventTarget}
+ */
+goog.net.XhrIo = function(opt_xmlHttpFactory) {
+  goog.net.XhrIo.base(this, 'constructor');
+
+  /**
+   * Map of default headers to add to every request, use:
+   * XhrIo.headers.set(name, value)
+   * @type {!goog.structs.Map}
+   */
+  this.headers = new goog.structs.Map();
+
+  /**
+   * Optional XmlHttpFactory
+   * @private {goog.net.XmlHttpFactory}
+   */
+  this.xmlHttpFactory_ = opt_xmlHttpFactory || null;
+
+  /**
+   * Whether XMLHttpRequest is active.  A request is active from the time send()
+   * is called until onReadyStateChange() is complete, or error() or abort()
+   * is called.
+   * @private {boolean}
+   */
+  this.active_ = false;
+
+  /**
+   * The XMLHttpRequest object that is being used for the transfer.
+   * @private {?goog.net.XhrLike.OrNative}
+   */
+  this.xhr_ = null;
+
+  /**
+   * The options to use with the current XMLHttpRequest object.
+   * @private {Object}
+   */
+  this.xhrOptions_ = null;
+
+  /**
+   * Last URL that was requested.
+   * @private {string|goog.Uri}
+   */
+  this.lastUri_ = '';
+
+  /**
+   * Method for the last request.
+   * @private {string}
+   */
+  this.lastMethod_ = '';
+
+  /**
+   * Last error code.
+   * @private {!goog.net.ErrorCode}
+   */
+  this.lastErrorCode_ = goog.net.ErrorCode.NO_ERROR;
+
+  /**
+   * Last error message.
+   * @private {Error|string}
+   */
+  this.lastError_ = '';
+
+  /**
+   * Used to ensure that we don't dispatch an multiple ERROR events. This can
+   * happen in IE when it does a synchronous load and one error is handled in
+   * the ready statte change and one is handled due to send() throwing an
+   * exception.
+   * @private {boolean}
+   */
+  this.errorDispatched_ = false;
+
+  /**
+   * Used to make sure we don't fire the complete event from inside a send call.
+   * @private {boolean}
+   */
+  this.inSend_ = false;
+
+  /**
+   * Used in determining if a call to {@link #onReadyStateChange_} is from
+   * within a call to this.xhr_.open.
+   * @private {boolean}
+   */
+  this.inOpen_ = false;
+
+  /**
+   * Used in determining if a call to {@link #onReadyStateChange_} is from
+   * within a call to this.xhr_.abort.
+   * @private {boolean}
+   */
+  this.inAbort_ = false;
+
+  /**
+   * Number of milliseconds after which an incomplete request will be aborted
+   * and a {@link goog.net.EventType.TIMEOUT} event raised; 0 means no timeout
+   * is set.
+   * @private {number}
+   */
+  this.timeoutInterval_ = 0;
+
+  /**
+   * Timer to track request timeout.
+   * @private {?number}
+   */
+  this.timeoutId_ = null;
+
+  /**
+   * The requested type for the response. The empty string means use the default
+   * XHR behavior.
+   * @private {goog.net.XhrIo.ResponseType}
+   */
+  this.responseType_ = goog.net.XhrIo.ResponseType.DEFAULT;
+
+  /**
+   * Whether a "credentialed" request is to be sent (one that is aware of
+   * cookies and authentication). This is applicable only for cross-domain
+   * requests and more recent browsers that support this part of the HTTP Access
+   * Control standard.
+   *
+   * @see http://www.w3.org/TR/XMLHttpRequest/#the-withcredentials-attribute
+   *
+   * @private {boolean}
+   */
+  this.withCredentials_ = false;
+
+  /**
+   * Whether progress events are enabled for this request. This is
+   * disabled by default because setting a progress event handler
+   * causes pre-flight OPTIONS requests to be sent for CORS requests,
+   * even in cases where a pre-flight request would not otherwise be
+   * sent.
+   *
+   * @see http://xhr.spec.whatwg.org/#security-considerations
+   *
+   * Note that this can cause problems for Firefox 22 and below, as an
+   * older "LSProgressEvent" will be dispatched by the browser. That
+   * progress event is no longer supported, and can lead to failures,
+   * including throwing exceptions.
+   *
+   * @see http://bugzilla.mozilla.org/show_bug.cgi?id=845631
+   * @see b/23469793
+   *
+   * @private {boolean}
+   */
+  this.progressEventsEnabled_ = false;
+
+  /**
+   * True if we can use XMLHttpRequest's timeout directly.
+   * @private {boolean}
+   */
+  this.useXhr2Timeout_ = false;
+};
+goog.inherits(goog.net.XhrIo, goog.events.EventTarget);
+
+
+/**
+ * Response types that may be requested for XMLHttpRequests.
+ * @enum {string}
+ * @see http://www.w3.org/TR/XMLHttpRequest/#the-responsetype-attribute
+ */
+goog.net.XhrIo.ResponseType = {
+  DEFAULT: '',
+  TEXT: 'text',
+  DOCUMENT: 'document',
+  // Not supported as of Chrome 10.0.612.1 dev
+  BLOB: 'blob',
+  ARRAY_BUFFER: 'arraybuffer'
+};
+
+
+/**
+ * A reference to the XhrIo logger
+ * @private {goog.debug.Logger}
+ * @const
+ */
+goog.net.XhrIo.prototype.logger_ =
+    goog.log.getLogger('goog.net.XhrIo');
+
+
+/**
+ * The Content-Type HTTP header name
+ * @type {string}
+ */
+goog.net.XhrIo.CONTENT_TYPE_HEADER = 'Content-Type';
+
+
+/**
+ * The pattern matching the 'http' and 'https' URI schemes
+ * @type {!RegExp}
+ */
+goog.net.XhrIo.HTTP_SCHEME_PATTERN = /^https?$/i;
+
+
+/**
+ * The methods that typically come along with form data.  We set different
+ * headers depending on whether the HTTP action is one of these.
+ */
+goog.net.XhrIo.METHODS_WITH_FORM_DATA = ['POST', 'PUT'];
+
+
+/**
+ * The Content-Type HTTP header value for a url-encoded form
+ * @type {string}
+ */
+goog.net.XhrIo.FORM_CONTENT_TYPE =
+    'application/x-www-form-urlencoded;charset=utf-8';
+
+
+/**
+ * The XMLHttpRequest Level two timeout delay ms property name.
+ *
+ * @see http://www.w3.org/TR/XMLHttpRequest/#the-timeout-attribute
+ *
+ * @private {string}
+ * @const
+ */
+goog.net.XhrIo.XHR2_TIMEOUT_ = 'timeout';
+
+
+/**
+ * The XMLHttpRequest Level two ontimeout handler property name.
+ *
+ * @see http://www.w3.org/TR/XMLHttpRequest/#the-timeout-attribute
+ *
+ * @private {string}
+ * @const
+ */
+goog.net.XhrIo.XHR2_ON_TIMEOUT_ = 'ontimeout';
+
+
+/**
+ * All non-disposed instances of goog.net.XhrIo created
+ * by {@link goog.net.XhrIo.send} are in this Array.
+ * @see goog.net.XhrIo.cleanup
+ * @private {!Array<!goog.net.XhrIo>}
+ */
+goog.net.XhrIo.sendInstances_ = [];
+
+
+/**
+ * Static send that creates a short lived instance of XhrIo to send the
+ * request.
+ * @see goog.net.XhrIo.cleanup
+ * @param {string|goog.Uri} url Uri to make request to.
+ * @param {?function(this:goog.net.XhrIo, ?)=} opt_callback Callback function
+ *     for when request is complete.
+ * @param {string=} opt_method Send method, default: GET.
+ * @param {ArrayBuffer|ArrayBufferView|Blob|Document|FormData|string=}
+ *     opt_content Body data.
+ * @param {Object|goog.structs.Map=} opt_headers Map of headers to add to the
+ *     request.
+ * @param {number=} opt_timeoutInterval Number of milliseconds after which an
+ *     incomplete request will be aborted; 0 means no timeout is set.
+ * @param {boolean=} opt_withCredentials Whether to send credentials with the
+ *     request. Default to false. See {@link goog.net.XhrIo#setWithCredentials}.
+ * @return {!goog.net.XhrIo} The sent XhrIo.
+ */
+goog.net.XhrIo.send = function(url, opt_callback, opt_method, opt_content,
+                               opt_headers, opt_timeoutInterval,
+                               opt_withCredentials) {
+  var x = new goog.net.XhrIo();
+  goog.net.XhrIo.sendInstances_.push(x);
+  if (opt_callback) {
+    x.listen(goog.net.EventType.COMPLETE, opt_callback);
+  }
+  x.listenOnce(goog.net.EventType.READY, x.cleanupSend_);
+  if (opt_timeoutInterval) {
+    x.setTimeoutInterval(opt_timeoutInterval);
+  }
+  if (opt_withCredentials) {
+    x.setWithCredentials(opt_withCredentials);
+  }
+  x.send(url, opt_method, opt_content, opt_headers);
+  return x;
+};
+
+
+/**
+ * Disposes all non-disposed instances of goog.net.XhrIo created by
+ * {@link goog.net.XhrIo.send}.
+ * {@link goog.net.XhrIo.send} cleans up the goog.net.XhrIo instance
+ * it creates when the request completes or fails.  However, if
+ * the request never completes, then the goog.net.XhrIo is not disposed.
+ * This can occur if the window is unloaded before the request completes.
+ * We could have {@link goog.net.XhrIo.send} return the goog.net.XhrIo
+ * it creates and make the client of {@link goog.net.XhrIo.send} be
+ * responsible for disposing it in this case.  However, this makes things
+ * significantly more complicated for the client, and the whole point
+ * of {@link goog.net.XhrIo.send} is that it's simple and easy to use.
+ * Clients of {@link goog.net.XhrIo.send} should call
+ * {@link goog.net.XhrIo.cleanup} when doing final
+ * cleanup on window unload.
+ */
+goog.net.XhrIo.cleanup = function() {
+  var instances = goog.net.XhrIo.sendInstances_;
+  while (instances.length) {
+    instances.pop().dispose();
+  }
+};
+
+
+/**
+ * Installs exception protection for all entry point introduced by
+ * goog.net.XhrIo instances which are not protected by
+ * {@link goog.debug.ErrorHandler#protectWindowSetTimeout},
+ * {@link goog.debug.ErrorHandler#protectWindowSetInterval}, or
+ * {@link goog.events.protectBrowserEventEntryPoint}.
+ *
+ * @param {goog.debug.ErrorHandler} errorHandler Error handler with which to
+ *     protect the entry point(s).
+ */
+goog.net.XhrIo.protectEntryPoints = function(errorHandler) {
+  goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_ =
+      errorHandler.protectEntryPoint(
+          goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_);
+};
+
+
+/**
+ * Disposes of the specified goog.net.XhrIo created by
+ * {@link goog.net.XhrIo.send} and removes it from
+ * {@link goog.net.XhrIo.pendingStaticSendInstances_}.
+ * @private
+ */
+goog.net.XhrIo.prototype.cleanupSend_ = function() {
+  this.dispose();
+  goog.array.remove(goog.net.XhrIo.sendInstances_, this);
+};
+
+
+/**
+ * Returns the number of milliseconds after which an incomplete request will be
+ * aborted, or 0 if no timeout is set.
+ * @return {number} Timeout interval in milliseconds.
+ */
+goog.net.XhrIo.prototype.getTimeoutInterval = function() {
+  return this.timeoutInterval_;
+};
+
+
+/**
+ * Sets the number of milliseconds after which an incomplete request will be
+ * aborted and a {@link goog.net.EventType.TIMEOUT} event raised; 0 means no
+ * timeout is set.
+ * @param {number} ms Timeout interval in milliseconds; 0 means none.
+ */
+goog.net.XhrIo.prototype.setTimeoutInterval = function(ms) {
+  this.timeoutInterval_ = Math.max(0, ms);
+};
+
+
+/**
+ * Sets the desired type for the response. At time of writing, this is only
+ * supported in very recent versions of WebKit (10.0.612.1 dev and later).
+ *
+ * If this is used, the response may only be accessed via {@link #getResponse}.
+ *
+ * @param {goog.net.XhrIo.ResponseType} type The desired type for the response.
+ */
+goog.net.XhrIo.prototype.setResponseType = function(type) {
+  this.responseType_ = type;
+};
+
+
+/**
+ * Gets the desired type for the response.
+ * @return {goog.net.XhrIo.ResponseType} The desired type for the response.
+ */
+goog.net.XhrIo.prototype.getResponseType = function() {
+  return this.responseType_;
+};
+
+
+/**
+ * Sets whether a "credentialed" request that is aware of cookie and
+ * authentication information should be made. This option is only supported by
+ * browsers that support HTTP Access Control. As of this writing, this option
+ * is not supported in IE.
+ *
+ * @param {boolean} withCredentials Whether this should be a "credentialed"
+ *     request.
+ */
+goog.net.XhrIo.prototype.setWithCredentials = function(withCredentials) {
+  this.withCredentials_ = withCredentials;
+};
+
+
+/**
+ * Gets whether a "credentialed" request is to be sent.
+ * @return {boolean} The desired type for the response.
+ */
+goog.net.XhrIo.prototype.getWithCredentials = function() {
+  return this.withCredentials_;
+};
+
+
+/**
+ * Sets whether progress events are enabled for this request. Note
+ * that progress events require pre-flight OPTIONS request handling
+ * for CORS requests, and may cause trouble with older browsers. See
+ * progressEventsEnabled_ for details.
+ * @param {boolean} enabled Whether progress events should be enabled.
+ */
+goog.net.XhrIo.prototype.setProgressEventsEnabled = function(enabled) {
+  this.progressEventsEnabled_ = enabled;
+};
+
+
+/**
+ * Gets whether progress events are enabled.
+ * @return {boolean} Whether progress events are enabled for this request.
+ */
+goog.net.XhrIo.prototype.getProgressEventsEnabled = function() {
+  return this.progressEventsEnabled_;
+};
+
+
+/**
+ * Instance send that actually uses XMLHttpRequest to make a server call.
+ * @param {string|goog.Uri} url Uri to make request to.
+ * @param {string=} opt_method Send method, default: GET.
+ * @param {ArrayBuffer|ArrayBufferView|Blob|Document|FormData|string=}
+ *     opt_content Body data.
+ * @param {Object|goog.structs.Map=} opt_headers Map of headers to add to the
+ *     request.
+ */
+goog.net.XhrIo.prototype.send = function(url, opt_method, opt_content,
+                                         opt_headers) {
+  if (this.xhr_) {
+    throw Error('[goog.net.XhrIo] Object is active with another request=' +
+        this.lastUri_ + '; newUri=' + url);
+  }
+
+  var method = opt_method ? opt_method.toUpperCase() : 'GET';
+
+  this.lastUri_ = url;
+  this.lastError_ = '';
+  this.lastErrorCode_ = goog.net.ErrorCode.NO_ERROR;
+  this.lastMethod_ = method;
+  this.errorDispatched_ = false;
+  this.active_ = true;
+
+  // Use the factory to create the XHR object and options
+  this.xhr_ = this.createXhr();
+  this.xhrOptions_ = this.xmlHttpFactory_ ?
+      this.xmlHttpFactory_.getOptions() : goog.net.XmlHttp.getOptions();
+
+  // Set up the onreadystatechange callback
+  this.xhr_.onreadystatechange = goog.bind(this.onReadyStateChange_, this);
+
+  // Set up upload/download progress events, if progress events are supported.
+  if (this.getProgressEventsEnabled() && 'onprogress' in this.xhr_) {
+    this.xhr_.onprogress = goog.bind(this.onProgressHandler_, this);
+    if (this.xhr_.upload) {
+      this.xhr_.upload.onprogress = goog.bind(this.onProgressHandler_, this);
+    }
+  }
+
+  /**
+   * Try to open the XMLHttpRequest (always async), if an error occurs here it
+   * is generally permission denied
+   * @preserveTry
+   */
+  try {
+    goog.log.fine(this.logger_, this.formatMsg_('Opening Xhr'));
+    this.inOpen_ = true;
+    this.xhr_.open(method, String(url), true);  // Always async!
+    this.inOpen_ = false;
+  } catch (err) {
+    goog.log.fine(this.logger_,
+        this.formatMsg_('Error opening Xhr: ' + err.message));
+    this.error_(goog.net.ErrorCode.EXCEPTION, err);
+    return;
+  }
+
+  // We can't use null since this won't allow requests with form data to have a
+  // content length specified which will cause some proxies to return a 411
+  // error.
+  var content = opt_content || '';
+
+  var headers = this.headers.clone();
+
+  // Add headers specific to this request
+  if (opt_headers) {
+    goog.structs.forEach(opt_headers, function(value, key) {
+      headers.set(key, value);
+    });
+  }
+
+  // Find whether a content type header is set, ignoring case.
+  // HTTP header names are case-insensitive.  See:
+  // http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2
+  var contentTypeKey = goog.array.find(headers.getKeys(),
+      goog.net.XhrIo.isContentTypeHeader_);
+
+  var contentIsFormData = (goog.global['FormData'] &&
+      (content instanceof goog.global['FormData']));
+  if (goog.array.contains(goog.net.XhrIo.METHODS_WITH_FORM_DATA, method) &&
+      !contentTypeKey && !contentIsFormData) {
+    // For requests typically with form data, default to the url-encoded form
+    // content type unless this is a FormData request.  For FormData,
+    // the browser will automatically add a multipart/form-data content type
+    // with an appropriate multipart boundary.
+    headers.set(goog.net.XhrIo.CONTENT_TYPE_HEADER,
+                goog.net.XhrIo.FORM_CONTENT_TYPE);
+  }
+
+  // Add the headers to the Xhr object
+  headers.forEach(function(value, key) {
+    this.xhr_.setRequestHeader(key, value);
+  }, this);
+
+  if (this.responseType_) {
+    this.xhr_.responseType = this.responseType_;
+  }
+
+  if (goog.object.containsKey(this.xhr_, 'withCredentials')) {
+    this.xhr_.withCredentials = this.withCredentials_;
+  }
+
+  /**
+   * Try to send the request, or other wise report an error (404 not found).
+   * @preserveTry
+   */
+  try {
+    this.cleanUpTimeoutTimer_(); // Paranoid, should never be running.
+    if (this.timeoutInterval_ > 0) {
+      this.useXhr2Timeout_ = goog.net.XhrIo.shouldUseXhr2Timeout_(this.xhr_);
+      goog.log.fine(this.logger_, this.formatMsg_('Will abort after ' +
+          this.timeoutInterval_ + 'ms if incomplete, xhr2 ' +
+          this.useXhr2Timeout_));
+      if (this.useXhr2Timeout_) {
+        this.xhr_[goog.net.XhrIo.XHR2_TIMEOUT_] = this.timeoutInterval_;
+        this.xhr_[goog.net.XhrIo.XHR2_ON_TIMEOUT_] =
+            goog.bind(this.timeout_, this);
+      } else {
+        this.timeoutId_ = goog.Timer.callOnce(this.timeout_,
+            this.timeoutInterval_, this);
+      }
+    }
+    goog.log.fine(this.logger_, this.formatMsg_('Sending request'));
+    this.inSend_ = true;
+    this.xhr_.send(content);
+    this.inSend_ = false;
+
+  } catch (err) {
+    goog.log.fine(this.logger_, this.formatMsg_('Send error: ' + err.message));
+    this.error_(goog.net.ErrorCode.EXCEPTION, err);
+  }
+};
+
+
+/**
+ * Determines if the argument is an XMLHttpRequest that supports the level 2
+ * timeout value and event.
+ *
+ * Currently, FF 21.0 OS X has the fields but won't actually call the timeout
+ * handler.  Perhaps the confusion in the bug referenced below hasn't
+ * entirely been resolved.
+ *
+ * @see http://www.w3.org/TR/XMLHttpRequest/#the-timeout-attribute
+ * @see https://bugzilla.mozilla.org/show_bug.cgi?id=525816
+ *
+ * @param {!goog.net.XhrLike.OrNative} xhr The request.
+ * @return {boolean} True if the request supports level 2 timeout.
+ * @private
+ */
+goog.net.XhrIo.shouldUseXhr2Timeout_ = function(xhr) {
+  return goog.userAgent.IE &&
+      goog.userAgent.isVersionOrHigher(9) &&
+      goog.isNumber(xhr[goog.net.XhrIo.XHR2_TIMEOUT_]) &&
+      goog.isDef(xhr[goog.net.XhrIo.XHR2_ON_TIMEOUT_]);
+};
+
+
+/**
+ * @param {string} header An HTTP header key.
+ * @return {boolean} Whether the key is a content type header (ignoring
+ *     case.
+ * @private
+ */
+goog.net.XhrIo.isContentTypeHeader_ = function(header) {
+  return goog.string.caseInsensitiveEquals(
+      goog.net.XhrIo.CONTENT_TYPE_HEADER, header);
+};
+
+
+/**
+ * Creates a new XHR object.
+ * @return {!goog.net.XhrLike.OrNative} The newly created XHR object.
+ * @protected
+ */
+goog.net.XhrIo.prototype.createXhr = function() {
+  return this.xmlHttpFactory_ ?
+      this.xmlHttpFactory_.createInstance() : goog.net.XmlHttp();
+};
+
+
+/**
+ * The request didn't complete after {@link goog.net.XhrIo#timeoutInterval_}
+ * milliseconds; raises a {@link goog.net.EventType.TIMEOUT} event and aborts
+ * the request.
+ * @private
+ */
+goog.net.XhrIo.prototype.timeout_ = function() {
+  if (typeof goog == 'undefined') {
+    // If goog is undefined then the callback has occurred as the application
+    // is unloading and will error.  Thus we let it silently fail.
+  } else if (this.xhr_) {
+    this.lastError_ = 'Timed out after ' + this.timeoutInterval_ +
+                      'ms, aborting';
+    this.lastErrorCode_ = goog.net.ErrorCode.TIMEOUT;
+    goog.log.fine(this.logger_, this.formatMsg_(this.lastError_));
+    this.dispatchEvent(goog.net.EventType.TIMEOUT);
+    this.abort(goog.net.ErrorCode.TIMEOUT);
+  }
+};
+
+
+/**
+ * Something errorred, so inactivate, fire error callback and clean up
+ * @param {goog.net.ErrorCode} errorCode The error code.
+ * @param {Error} err The error object.
+ * @private
+ */
+goog.net.XhrIo.prototype.error_ = function(errorCode, err) {
+  this.active_ = false;
+  if (this.xhr_) {
+    this.inAbort_ = true;
+    this.xhr_.abort();  // Ensures XHR isn't hung (FF)
+    this.inAbort_ = false;
+  }
+  this.lastError_ = err;
+  this.lastErrorCode_ = errorCode;
+  this.dispatchErrors_();
+  this.cleanUpXhr_();
+};
+
+
+/**
+ * Dispatches COMPLETE and ERROR in case of an error. This ensures that we do
+ * not dispatch multiple error events.
+ * @private
+ */
+goog.net.XhrIo.prototype.dispatchErrors_ = function() {
+  if (!this.errorDispatched_) {
+    this.errorDispatched_ = true;
+    this.dispatchEvent(goog.net.EventType.COMPLETE);
+    this.dispatchEvent(goog.net.EventType.ERROR);
+  }
+};
+
+
+/**
+ * Abort the current XMLHttpRequest
+ * @param {goog.net.ErrorCode=} opt_failureCode Optional error code to use -
+ *     defaults to ABORT.
+ */
+goog.net.XhrIo.prototype.abort = function(opt_failureCode) {
+  if (this.xhr_ && this.active_) {
+    goog.log.fine(this.logger_, this.formatMsg_('Aborting'));
+    this.active_ = false;
+    this.inAbort_ = true;
+    this.xhr_.abort();
+    this.inAbort_ = false;
+    this.lastErrorCode_ = opt_failureCode || goog.net.ErrorCode.ABORT;
+    this.dispatchEvent(goog.net.EventType.COMPLETE);
+    this.dispatchEvent(goog.net.EventType.ABORT);
+    this.cleanUpXhr_();
+  }
+};
+
+
+/**
+ * Nullifies all callbacks to reduce risks of leaks.
+ * @override
+ * @protected
+ */
+goog.net.XhrIo.prototype.disposeInternal = function() {
+  if (this.xhr_) {
+    // We explicitly do not call xhr_.abort() unless active_ is still true.
+    // This is to avoid unnecessarily aborting a successful request when
+    // dispose() is called in a callback triggered by a complete response, but
+    // in which browser cleanup has not yet finished.
+    // (See http://b/issue?id=1684217.)
+    if (this.active_) {
+      this.active_ = false;
+      this.inAbort_ = true;
+      this.xhr_.abort();
+      this.inAbort_ = false;
+    }
+    this.cleanUpXhr_(true);
+  }
+
+  goog.net.XhrIo.base(this, 'disposeInternal');
+};
+
+
+/**
+ * Internal handler for the XHR object's readystatechange event.  This method
+ * checks the status and the readystate and fires the correct callbacks.
+ * If the request has ended, the handlers are cleaned up and the XHR object is
+ * nullified.
+ * @private
+ */
+goog.net.XhrIo.prototype.onReadyStateChange_ = function() {
+  if (this.isDisposed()) {
+    // This method is the target of an untracked goog.Timer.callOnce().
+    return;
+  }
+  if (!this.inOpen_ && !this.inSend_ && !this.inAbort_) {
+    // Were not being called from within a call to this.xhr_.send
+    // this.xhr_.abort, or this.xhr_.open, so this is an entry point
+    this.onReadyStateChangeEntryPoint_();
+  } else {
+    this.onReadyStateChangeHelper_();
+  }
+};
+
+
+/**
+ * Used to protect the onreadystatechange handler entry point.  Necessary
+ * as {#onReadyStateChange_} maybe called from within send or abort, this
+ * method is only called when {#onReadyStateChange_} is called as an
+ * entry point.
+ * {@see #protectEntryPoints}
+ * @private
+ */
+goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_ = function() {
+  this.onReadyStateChangeHelper_();
+};
+
+
+/**
+ * Helper for {@link #onReadyStateChange_}.  This is used so that
+ * entry point calls to {@link #onReadyStateChange_} can be routed through
+ * {@link #onReadyStateChangeEntryPoint_}.
+ * @private
+ */
+goog.net.XhrIo.prototype.onReadyStateChangeHelper_ = function() {
+  if (!this.active_) {
+    // can get called inside abort call
+    return;
+  }
+
+  if (typeof goog == 'undefined') {
+    // NOTE(user): If goog is undefined then the callback has occurred as the
+    // application is unloading and will error.  Thus we let it silently fail.
+
+  } else if (
+      this.xhrOptions_[goog.net.XmlHttp.OptionType.LOCAL_REQUEST_ERROR] &&
+      this.getReadyState() == goog.net.XmlHttp.ReadyState.COMPLETE &&
+      this.getStatus() == 2) {
+    // NOTE(user): In IE if send() errors on a *local* request the readystate
+    // is still changed to COMPLETE.  We need to ignore it and allow the
+    // try/catch around send() to pick up the error.
+    goog.log.fine(this.logger_, this.formatMsg_(
+        'Local request error detected and ignored'));
+
+  } else {
+
+    // In IE when the response has been cached we sometimes get the callback
+    // from inside the send call and this usually breaks code that assumes that
+    // XhrIo is asynchronous.  If that is the case we delay the callback
+    // using a timer.
+    if (this.inSend_ &&
+        this.getReadyState() == goog.net.XmlHttp.ReadyState.COMPLETE) {
+      goog.Timer.callOnce(this.onReadyStateChange_, 0, this);
+      return;
+    }
+
+    this.dispatchEvent(goog.net.EventType.READY_STATE_CHANGE);
+
+    // readyState indicates the transfer has finished
+    if (this.isComplete()) {
+      goog.log.fine(this.logger_, this.formatMsg_('Request complete'));
+
+      this.active_ = false;
+
+      try {
+        // Call the specific callbacks for success or failure. Only call the
+        // success if the status is 200 (HTTP_OK) or 304 (HTTP_CACHED)
+        if (this.isSuccess()) {
+          this.dispatchEvent(goog.net.EventType.COMPLETE);
+          this.dispatchEvent(goog.net.EventType.SUCCESS);
+        } else {
+          this.lastErrorCode_ = goog.net.ErrorCode.HTTP_ERROR;
+          this.lastError_ =
+              this.getStatusText() + ' [' + this.getStatus() + ']';
+          this.dispatchErrors_();
+        }
+      } finally {
+        this.cleanUpXhr_();
+      }
+    }
+  }
+};
+
+
+/**
+ * Internal handler for the XHR object's onprogress event.
+ * @param {!ProgressEvent} e XHR progress event.
+ * @private
+ */
+goog.net.XhrIo.prototype.onProgressHandler_ = function(e) {
+  goog.asserts.assert(e.type === goog.net.EventType.PROGRESS,
+      'goog.net.EventType.PROGRESS is of the same type as raw XHR progress.');
+  // Redispatch the progress event.
+  this.dispatchEvent(e);
+};
+
+
+/**
+ * Remove the listener to protect against leaks, and nullify the XMLHttpRequest
+ * object.
+ * @param {boolean=} opt_fromDispose If this is from the dispose (don't want to
+ *     fire any events).
+ * @private
+ */
+goog.net.XhrIo.prototype.cleanUpXhr_ = function(opt_fromDispose) {
+  if (this.xhr_) {
+    // Cancel any pending timeout event handler.
+    this.cleanUpTimeoutTimer_();
+
+    // Save reference so we can mark it as closed after the READY event.  The
+    // READY event may trigger another request, thus we must nullify this.xhr_
+    var xhr = this.xhr_;
+    var clearedOnReadyStateChange =
+        this.xhrOptions_[goog.net.XmlHttp.OptionType.USE_NULL_FUNCTION] ?
+            goog.nullFunction : null;
+    this.xhr_ = null;
+    this.xhrOptions_ = null;
+
+    if (!opt_fromDispose) {
+      this.dispatchEvent(goog.net.EventType.READY);
+    }
+
+    try {
+      // NOTE(user): Not nullifying in FireFox can still leak if the callbacks
+      // are defined in the same scope as the instance of XhrIo. But, IE doesn't
+      // allow you to set the onreadystatechange to NULL so nullFunction is
+      // used.
+      xhr.onreadystatechange = clearedOnReadyStateChange;
+    } catch (e) {
+      // This seems to occur with a Gears HTTP request. Delayed the setting of
+      // this onreadystatechange until after READY is sent out and catching the
+      // error to see if we can track down the problem.
+      goog.log.error(this.logger_,
+          'Problem encountered resetting onreadystatechange: ' + e.message);
+    }
+  }
+};
+
+
+/**
+ * Make sure the timeout timer isn't running.
+ * @private
+ */
+goog.net.XhrIo.prototype.cleanUpTimeoutTimer_ = function() {
+  if (this.xhr_ && this.useXhr2Timeout_) {
+    this.xhr_[goog.net.XhrIo.XHR2_ON_TIMEOUT_] = null;
+  }
+  if (goog.isNumber(this.timeoutId_)) {
+    goog.Timer.clear(this.timeoutId_);
+    this.timeoutId_ = null;
+  }
+};
+
+
+/**
+ * @return {boolean} Whether there is an active request.
+ */
+goog.net.XhrIo.prototype.isActive = function() {
+  return !!this.xhr_;
+};
+
+
+/**
+ * @return {boolean} Whether the request has completed.
+ */
+goog.net.XhrIo.prototype.isComplete = function() {
+  return this.getReadyState() == goog.net.XmlHttp.ReadyState.COMPLETE;
+};
+
+
+/**
+ * @return {boolean} Whether the request completed with a success.
+ */
+goog.net.XhrIo.prototype.isSuccess = function() {
+  var status = this.getStatus();
+  // A zero status code is considered successful for local files.
+  return goog.net.HttpStatus.isSuccess(status) ||
+      status === 0 && !this.isLastUriEffectiveSchemeHttp_();
+};
+
+
+/**
+ * @return {boolean} whether the effective scheme of the last URI that was
+ *     fetched was 'http' or 'https'.
+ * @private
+ */
+goog.net.XhrIo.prototype.isLastUriEffectiveSchemeHttp_ = function() {
+  var scheme = goog.uri.utils.getEffectiveScheme(String(this.lastUri_));
+  return goog.net.XhrIo.HTTP_SCHEME_PATTERN.test(scheme);
+};
+
+
+/**
+ * Get the readystate from the Xhr object
+ * Will only return correct result when called from the context of a callback
+ * @return {goog.net.XmlHttp.ReadyState} goog.net.XmlHttp.ReadyState.*.
+ */
+goog.net.XhrIo.prototype.getReadyState = function() {
+  return this.xhr_ ?
+      /** @type {goog.net.XmlHttp.ReadyState} */ (this.xhr_.readyState) :
+      goog.net.XmlHttp.ReadyState.UNINITIALIZED;
+};
+
+
+/**
+ * Get the status from the Xhr object
+ * Will only return correct result when called from the context of a callback
+ * @return {number} Http status.
+ */
+goog.net.XhrIo.prototype.getStatus = function() {
+  /**
+   * IE doesn't like you checking status until the readystate is greater than 2
+   * (i.e. it is receiving or complete).  The try/catch is used for when the
+   * page is unloading and an ERROR_NOT_AVAILABLE may occur when accessing xhr_.
+   * @preserveTry
+   */
+  try {
+    return this.getReadyState() > goog.net.XmlHttp.ReadyState.LOADED ?
+        this.xhr_.status : -1;
+  } catch (e) {
+    return -1;
+  }
+};
+
+
+/**
+ * Get the status text from the Xhr object
+ * Will only return correct result when called from the context of a callback
+ * @return {string} Status text.
+ */
+goog.net.XhrIo.prototype.getStatusText = function() {
+  /**
+   * IE doesn't like you checking status until the readystate is greater than 2
+   * (i.e. it is recieving or complete).  The try/catch is used for when the
+   * page is unloading and an ERROR_NOT_AVAILABLE may occur when accessing xhr_.
+   * @preserveTry
+   */
+  try {
+    return this.getReadyState() > goog.net.XmlHttp.ReadyState.LOADED ?
+        this.xhr_.statusText : '';
+  } catch (e) {
+    goog.log.fine(this.logger_, 'Can not get status: ' + e.message);
+    return '';
+  }
+};
+
+
+/**
+ * Get the last Uri that was requested
+ * @return {string} Last Uri.
+ */
+goog.net.XhrIo.prototype.getLastUri = function() {
+  return String(this.lastUri_);
+};
+
+
+/**
+ * Get the response text from the Xhr object
+ * Will only return correct result when called from the context of a callback.
+ * @return {string} Result from the server, or '' if no result available.
+ */
+goog.net.XhrIo.prototype.getResponseText = function() {
+  /** @preserveTry */
+  try {
+    return this.xhr_ ? this.xhr_.responseText : '';
+  } catch (e) {
+    // http://www.w3.org/TR/XMLHttpRequest/#the-responsetext-attribute
+    // states that responseText should return '' (and responseXML null)
+    // when the state is not LOADING or DONE. Instead, IE can
+    // throw unexpected exceptions, for example when a request is aborted
+    // or no data is available yet.
+    goog.log.fine(this.logger_, 'Can not get responseText: ' + e.message);
+    return '';
+  }
+};
+
+
+/**
+ * Get the response body from the Xhr object. This property is only available
+ * in IE since version 7 according to MSDN:
+ * http://msdn.microsoft.com/en-us/library/ie/ms534368(v=vs.85).aspx
+ * Will only return correct result when called from the context of a callback.
+ *
+ * One option is to construct a VBArray from the returned object and convert
+ * it to a JavaScript array using the toArray method:
+ * {@code (new window['VBArray'](xhrIo.getResponseBody())).toArray()}
+ * This will result in an array of numbers in the range of [0..255]
+ *
+ * Another option is to use the VBScript CStr method to convert it into a
+ * string as outlined in http://stackoverflow.com/questions/1919972
+ *
+ * @return {Object} Binary result from the server or null if not available.
+ */
+goog.net.XhrIo.prototype.getResponseBody = function() {
+  /** @preserveTry */
+  try {
+    if (this.xhr_ && 'responseBody' in this.xhr_) {
+      return this.xhr_['responseBody'];
+    }
+  } catch (e) {
+    // IE can throw unexpected exceptions, for example when a request is aborted
+    // or no data is yet available.
+    goog.log.fine(this.logger_, 'Can not get responseBody: ' + e.message);
+  }
+  return null;
+};
+
+
+/**
+ * Get the response XML from the Xhr object
+ * Will only return correct result when called from the context of a callback.
+ * @return {Document} The DOM Document representing the XML file, or null
+ * if no result available.
+ */
+goog.net.XhrIo.prototype.getResponseXml = function() {
+  /** @preserveTry */
+  try {
+    return this.xhr_ ? this.xhr_.responseXML : null;
+  } catch (e) {
+    goog.log.fine(this.logger_, 'Can not get responseXML: ' + e.message);
+    return null;
+  }
+};
+
+
+/**
+ * Get the response and evaluates it as JSON from the Xhr object
+ * Will only return correct result when called from the context of a callback
+ * @param {string=} opt_xssiPrefix Optional XSSI prefix string to use for
+ *     stripping of the response before parsing. This needs to be set only if
+ *     your backend server prepends the same prefix string to the JSON response.
+ * @return {Object|undefined} JavaScript object.
+ */
+goog.net.XhrIo.prototype.getResponseJson = function(opt_xssiPrefix) {
+  if (!this.xhr_) {
+    return undefined;
+  }
+
+  var responseText = this.xhr_.responseText;
+  if (opt_xssiPrefix && responseText.indexOf(opt_xssiPrefix) == 0) {
+    responseText = responseText.substring(opt_xssiPrefix.length);
+  }
+
+  return goog.json.parse(responseText);
+};
+
+
+/**
+ * Get the response as the type specificed by {@link #setResponseType}. At time
+ * of writing, this is only directly supported in very recent versions of WebKit
+ * (10.0.612.1 dev and later). If the field is not supported directly, we will
+ * try to emulate it.
+ *
+ * Emulating the response means following the rules laid out at
+ * http://www.w3.org/TR/XMLHttpRequest/#the-response-attribute
+ *
+ * On browsers with no support for this (Chrome < 10, Firefox < 4, etc), only
+ * response types of DEFAULT or TEXT may be used, and the response returned will
+ * be the text response.
+ *
+ * On browsers with Mozilla's draft support for array buffers (Firefox 4, 5),
+ * only response types of DEFAULT, TEXT, and ARRAY_BUFFER may be used, and the
+ * response returned will be either the text response or the Mozilla
+ * implementation of the array buffer response.
+ *
+ * On browsers will full support, any valid response type supported by the
+ * browser may be used, and the response provided by the browser will be
+ * returned.
+ *
+ * @return {*} The response.
+ */
+goog.net.XhrIo.prototype.getResponse = function() {
+  /** @preserveTry */
+  try {
+    if (!this.xhr_) {
+      return null;
+    }
+    if ('response' in this.xhr_) {
+      return this.xhr_.response;
+    }
+    switch (this.responseType_) {
+      case goog.net.XhrIo.ResponseType.DEFAULT:
+      case goog.net.XhrIo.ResponseType.TEXT:
+        return this.xhr_.responseText;
+        // DOCUMENT and BLOB don't need to be handled here because they are
+        // introduced in the same spec that adds the .response field, and would
+        // have been caught above.
+        // ARRAY_BUFFER needs an implementation for Firefox 4, where it was
+        // implemented using a draft spec rather than the final spec.
+      case goog.net.XhrIo.ResponseType.ARRAY_BUFFER:
+        if ('mozResponseArrayBuffer' in this.xhr_) {
+          return this.xhr_.mozResponseArrayBuffer;
+        }
+    }
+    // Fell through to a response type that is not supported on this browser.
+    goog.log.error(this.logger_,
+        'Response type ' + this.responseType_ + ' is not ' +
+        'supported on this browser');
+    return null;
+  } catch (e) {
+    goog.log.fine(this.logger_, 'Can not get response: ' + e.message);
+    return null;
+  }
+};
+
+
+/**
+ * Get the value of the response-header with the given name from the Xhr object
+ * Will only return correct result when called from the context of a callback
+ * and the request has completed
+ * @param {string} key The name of the response-header to retrieve.
+ * @return {string|undefined} The value of the response-header named key.
+ */
+goog.net.XhrIo.prototype.getResponseHeader = function(key) {
+  return this.xhr_ && this.isComplete() ?
+      this.xhr_.getResponseHeader(key) : undefined;
+};
+
+
+/**
+ * Gets the text of all the headers in the response.
+ * Will only return correct result when called from the context of a callback
+ * and the request has completed.
+ * @return {string} The value of the response headers or empty string.
+ */
+goog.net.XhrIo.prototype.getAllResponseHeaders = function() {
+  return this.xhr_ && this.isComplete() ?
+      this.xhr_.getAllResponseHeaders() : '';
+};
+
+
+/**
+ * Returns all response headers as a key-value map.
+ * Multiple values for the same header key can be combined into one,
+ * separated by a comma and a space.
+ * Note that the native getResponseHeader method for retrieving a single header
+ * does a case insensitive match on the header name. This method does not
+ * include any case normalization logic, it will just return a key-value
+ * representation of the headers.
+ * See: http://www.w3.org/TR/XMLHttpRequest/#the-getresponseheader()-method
+ * @return {!Object<string, string>} An object with the header keys as keys
+ *     and header values as values.
+ */
+goog.net.XhrIo.prototype.getResponseHeaders = function() {
+  var headersObject = {};
+  var headersArray = this.getAllResponseHeaders().split('\r\n');
+  for (var i = 0; i < headersArray.length; i++) {
+    if (goog.string.isEmptyOrWhitespace(headersArray[i])) {
+      continue;
+    }
+    var keyValue = goog.string.splitLimit(headersArray[i], ': ', 2);
+    if (headersObject[keyValue[0]]) {
+      headersObject[keyValue[0]] += ', ' + keyValue[1];
+    } else {
+      headersObject[keyValue[0]] = keyValue[1];
+    }
+  }
+  return headersObject;
+};
+
+
+/**
+ * Get the last error message
+ * @return {goog.net.ErrorCode} Last error code.
+ */
+goog.net.XhrIo.prototype.getLastErrorCode = function() {
+  return this.lastErrorCode_;
+};
+
+
+/**
+ * Get the last error message
+ * @return {string} Last error message.
+ */
+goog.net.XhrIo.prototype.getLastError = function() {
+  return goog.isString(this.lastError_) ? this.lastError_ :
+      String(this.lastError_);
+};
+
+
+/**
+ * Adds the last method, status and URI to the message.  This is used to add
+ * this information to the logging calls.
+ * @param {string} msg The message text that we want to add the extra text to.
+ * @return {string} The message with the extra text appended.
+ * @private
+ */
+goog.net.XhrIo.prototype.formatMsg_ = function(msg) {
+  return msg + ' [' + this.lastMethod_ + ' ' + this.lastUri_ + ' ' +
+      this.getStatus() + ']';
+};
+
+
+// Register the xhr handler as an entry point, so that
+// it can be monitored for exception handling, etc.
+goog.debug.entryPointRegistry.register(
+    /**
+     * @param {function(!Function): !Function} transformer The transforming
+     *     function.
+     */
+    function(transformer) {
+      goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_ =
+          transformer(goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_);
+    });
+
+goog.provide('ol.TileLoadFunctionType');
+goog.provide('ol.TileVectorLoadFunctionType');
+
+
+/**
+ * A function that takes an {@link ol.Tile} for the tile and a
+ * `{string}` for the url as arguments.
+ *
+ * @typedef {function(ol.Tile, string)}
+ * @api
+ */
+ol.TileLoadFunctionType;
+
+
+/**
+ * A function that is called with a tile url for the features to load and
+ * a callback that takes the loaded features as argument.
+ *
+ * @typedef {function(string, function(Array.<ol.Feature>))}
+ * @api
+ */
+ol.TileVectorLoadFunctionType;
+
+goog.provide('ol.VectorTile');
+
+goog.require('ol.Tile');
+goog.require('ol.TileCoord');
+goog.require('ol.TileLoadFunctionType');
+goog.require('ol.TileState');
+goog.require('ol.proj.Projection');
+
+
+/**
+ * @typedef {{
+ *     dirty: boolean,
+ *     renderedRenderOrder: (null|function(ol.Feature, ol.Feature):number),
+ *     renderedRevision: number,
+ *     replayGroup: ol.render.IReplayGroup}}
+ */
+ol.TileReplayState;
+
+
+
+/**
+ * @constructor
+ * @extends {ol.Tile}
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {ol.TileState} state State.
+ * @param {string} src Data source url.
+ * @param {ol.format.Feature} format Feature format.
+ * @param {ol.TileLoadFunctionType} tileLoadFunction Tile load function.
+ * @param {ol.proj.Projection} projection Feature projection.
+ */
+ol.VectorTile =
+    function(tileCoord, state, src, format, tileLoadFunction, projection) {
+
+  goog.base(this, tileCoord, state);
+
+  /**
+   * @private
+   * @type {ol.format.Feature}
+   */
+  this.format_ = format;
+
+  /**
+   * @private
+   * @type {Array.<ol.Feature>}
+   */
+  this.features_ = null;
+
+  /**
+   * @private
+   * @type {ol.FeatureLoader}
+   */
+  this.loader_;
+
+  /**
+   * @private
+   * @type {ol.proj.Projection}
+   */
+  this.projection_ = projection;
+
+  /**
+   * @private
+   * @type {ol.TileReplayState}
+   */
+  this.replayState_ = {
+    dirty: false,
+    renderedRenderOrder: null,
+    renderedRevision: -1,
+    replayGroup: null
+  };
+
+  /**
+   * @private
+   * @type {ol.TileLoadFunctionType}
+   */
+  this.tileLoadFunction_ = tileLoadFunction;
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.url_ = src;
+
+};
+goog.inherits(ol.VectorTile, ol.Tile);
+
+
+/**
+ * @inheritDoc
+ */
+ol.VectorTile.prototype.disposeInternal = function() {
+  goog.base(this, 'disposeInternal');
+};
+
+
+/**
+ * Get the feature format assigned for reading this tile's features.
+ * @return {ol.format.Feature} Feature format.
+ * @api
+ */
+ol.VectorTile.prototype.getFormat = function() {
+  return this.format_;
+};
+
+
+/**
+ * @return {Array.<ol.Feature>} Features.
+ */
+ol.VectorTile.prototype.getFeatures = function() {
+  return this.features_;
+};
+
+
+/**
+ * @return {ol.TileReplayState}
+ */
+ol.VectorTile.prototype.getReplayState = function() {
+  return this.replayState_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.VectorTile.prototype.getKey = function() {
+  return this.url_;
+};
+
+
+/**
+ * @return {ol.proj.Projection} Feature projection.
+ */
+ol.VectorTile.prototype.getProjection = function() {
+  return this.projection_;
+};
+
+
+/**
+ * Load the tile.
+ */
+ol.VectorTile.prototype.load = function() {
+  if (this.state == ol.TileState.IDLE) {
+    this.setState(ol.TileState.LOADING);
+    this.tileLoadFunction_(this, this.url_);
+    this.loader_(null, NaN, this.projection_);
+  }
+};
+
+
+/**
+ * @param {Array.<ol.Feature>} features Features.
+ */
+ol.VectorTile.prototype.setFeatures = function(features) {
+  this.features_ = features;
+  this.setState(ol.TileState.LOADED);
+};
+
+
+/**
+ * @param {ol.proj.Projection} projection Feature projection.
+ */
+ol.VectorTile.prototype.setProjection = function(projection) {
+  this.projection_ = projection;
+};
+
+
+/**
+ * @param {ol.TileState} tileState Tile state.
+ */
+ol.VectorTile.prototype.setState = function(tileState) {
+  this.state = tileState;
+  this.changed();
+};
+
+
+/**
+ * Set the feature loader for reading this tile's features.
+ * @param {ol.FeatureLoader} loader Feature loader.
+ * @api
+ */
+ol.VectorTile.prototype.setLoader = function(loader) {
+  this.loader_ = loader;
+};
+
+goog.provide('ol.format.FormatType');
+
+
+/**
+ * @enum {string}
+ */
+ol.format.FormatType = {
+  ARRAY_BUFFER: 'arraybuffer',
+  JSON: 'json',
+  TEXT: 'text',
+  XML: 'xml'
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview
+ * XML utilities.
+ *
+ */
+
+goog.provide('goog.dom.xml');
+
+goog.require('goog.dom');
+goog.require('goog.dom.NodeType');
+goog.require('goog.userAgent');
+
+
+/**
+ * Max XML size for MSXML2.  Used to prevent potential DoS attacks.
+ * @type {number}
+ */
+goog.dom.xml.MAX_XML_SIZE_KB = 2 * 1024;  // In kB
+
+
+/**
+ * Max XML size for MSXML2.  Used to prevent potential DoS attacks.
+ * @type {number}
+ */
+goog.dom.xml.MAX_ELEMENT_DEPTH = 256; // Same default as MSXML6.
+
+
+/**
+ * Check for ActiveXObject support by the browser.
+ * @return {boolean} true if browser has ActiveXObject support.
+ * @private
+ */
+goog.dom.xml.hasActiveXObjectSupport_ = function() {
+  if (!goog.userAgent.IE) {
+    // Avoid raising useless exception in case code is not compiled
+    // and browser is not MSIE.
+    return false;
+  }
+  try {
+    // Due to lot of changes in IE 9, 10 & 11 behaviour and ActiveX being
+    // totally disableable using MSIE's security level, trying to create the
+    // ActiveXOjbect is a lot more reliable than testing for the existance of
+    // window.ActiveXObject
+    new ActiveXObject('MSXML2.DOMDocument');
+    return true;
+  } catch (e) {
+    return false;
+  }
+};
+
+
+/**
+ * True if browser has ActiveXObject support.
+ * Possible override if this test become wrong in coming IE versions.
+ * @type {boolean}
+ */
+goog.dom.xml.ACTIVEX_SUPPORT =
+    goog.userAgent.IE && goog.dom.xml.hasActiveXObjectSupport_();
+
+
+/**
+ * Creates an XML document appropriate for the current JS runtime
+ * @param {string=} opt_rootTagName The root tag name.
+ * @param {string=} opt_namespaceUri Namespace URI of the document element.
+ * @param {boolean=} opt_preferActiveX Whether to default to ActiveXObject to
+ * create Document in IE. Use this if you need xpath support in IE (e.g.,
+ * selectSingleNode or selectNodes), but be aware that the ActiveXObject does
+ * not support various DOM-specific Document methods and attributes.
+ * @return {Document} The new document.
+ * @throws {Error} if browser does not support creating new documents or
+ * namespace is provided without a root tag name.
+ */
+goog.dom.xml.createDocument = function(opt_rootTagName, opt_namespaceUri,
+                                       opt_preferActiveX) {
+  if (opt_namespaceUri && !opt_rootTagName) {
+    throw Error("Can't create document with namespace and no root tag");
+  }
+  // If document.implementation.createDocument is available and they haven't
+  // explicitly opted to use ActiveXObject when possible.
+  if (document.implementation && document.implementation.createDocument &&
+      !(goog.dom.xml.ACTIVEX_SUPPORT && opt_preferActiveX)) {
+    return document.implementation.createDocument(opt_namespaceUri || '',
+                                                  opt_rootTagName || '', null);
+  } else if (goog.dom.xml.ACTIVEX_SUPPORT) {
+    var doc = goog.dom.xml.createMsXmlDocument_();
+    if (doc) {
+      if (opt_rootTagName) {
+        doc.appendChild(doc.createNode(goog.dom.NodeType.ELEMENT,
+                                       opt_rootTagName,
+                                       opt_namespaceUri || ''));
+      }
+      return doc;
+    }
+  }
+  throw Error('Your browser does not support creating new documents');
+};
+
+
+/**
+ * Creates an XML document from a string
+ * @param {string} xml The text.
+ * @param {boolean=} opt_preferActiveX Whether to default to ActiveXObject to
+ * create Document in IE. Use this if you need xpath support in IE (e.g.,
+ * selectSingleNode or selectNodes), but be aware that the ActiveXObject does
+ * not support various DOM-specific Document methods and attributes.
+ * @return {Document} XML document from the text.
+ * @throws {Error} if browser does not support loading XML documents.
+ */
+goog.dom.xml.loadXml = function(xml, opt_preferActiveX) {
+  if (typeof DOMParser != 'undefined' &&
+      !(goog.dom.xml.ACTIVEX_SUPPORT && opt_preferActiveX)) {
+    return new DOMParser().parseFromString(xml, 'application/xml');
+  } else if (goog.dom.xml.ACTIVEX_SUPPORT) {
+    var doc = goog.dom.xml.createMsXmlDocument_();
+    doc.loadXML(xml);
+    return doc;
+  }
+  throw Error('Your browser does not support loading xml documents');
+};
+
+
+/**
+ * Serializes an XML document or subtree to string.
+ * @param {Document|Element} xml The document or the root node of the subtree.
+ * @return {string} The serialized XML.
+ * @throws {Error} if browser does not support XML serialization.
+ */
+goog.dom.xml.serialize = function(xml) {
+  // Compatible with IE/ActiveXObject.
+  var text = xml.xml;
+  if (text) {
+    return text;
+  }
+  // Compatible with Firefox, Opera and WebKit.
+  if (typeof XMLSerializer != 'undefined') {
+    return new XMLSerializer().serializeToString(xml);
+  }
+  throw Error('Your browser does not support serializing XML documents');
+};
+
+
+/**
+ * Selects a single node using an Xpath expression and a root node
+ * @param {Node} node The root node.
+ * @param {string} path Xpath selector.
+ * @return {Node} The selected node, or null if no matching node.
+ */
+goog.dom.xml.selectSingleNode = function(node, path) {
+  if (typeof node.selectSingleNode != 'undefined') {
+    var doc = goog.dom.getOwnerDocument(node);
+    if (typeof doc.setProperty != 'undefined') {
+      doc.setProperty('SelectionLanguage', 'XPath');
+    }
+    return node.selectSingleNode(path);
+  } else if (document.implementation.hasFeature('XPath', '3.0')) {
+    var doc = goog.dom.getOwnerDocument(node);
+    var resolver = doc.createNSResolver(doc.documentElement);
+    var result = doc.evaluate(path, node, resolver,
+        XPathResult.FIRST_ORDERED_NODE_TYPE, null);
+    return result.singleNodeValue;
+  }
+  // This browser does not support xpath for the given node. If IE, ensure XML
+  // Document was created using ActiveXObject
+  // TODO(joeltine): This should throw instead of return null.
+  return null;
+};
+
+
+/**
+ * Selects multiple nodes using an Xpath expression and a root node
+ * @param {Node} node The root node.
+ * @param {string} path Xpath selector.
+ * @return {(NodeList|Array<Node>)} The selected nodes, or empty array if no
+ *     matching nodes.
+ */
+goog.dom.xml.selectNodes = function(node, path) {
+  if (typeof node.selectNodes != 'undefined') {
+    var doc = goog.dom.getOwnerDocument(node);
+    if (typeof doc.setProperty != 'undefined') {
+      doc.setProperty('SelectionLanguage', 'XPath');
+    }
+    return node.selectNodes(path);
+  } else if (document.implementation.hasFeature('XPath', '3.0')) {
+    var doc = goog.dom.getOwnerDocument(node);
+    var resolver = doc.createNSResolver(doc.documentElement);
+    var nodes = doc.evaluate(path, node, resolver,
+        XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
+    var results = [];
+    var count = nodes.snapshotLength;
+    for (var i = 0; i < count; i++) {
+      results.push(nodes.snapshotItem(i));
+    }
+    return results;
+  } else {
+    // This browser does not support xpath for the given node. If IE, ensure XML
+    // Document was created using ActiveXObject.
+    // TODO(joeltine): This should throw instead of return empty array.
+    return [];
+  }
+};
+
+
+/**
+ * Sets multiple attributes on an element. Differs from goog.dom.setProperties
+ * in that it exclusively uses the element's setAttributes method. Use this
+ * when you need to ensure that the exact property is available as an attribute
+ * and can be read later by the native getAttribute method.
+ * @param {!Element} element XML or DOM element to set attributes on.
+ * @param {!Object<string, string>} attributes Map of property:value pairs.
+ */
+goog.dom.xml.setAttributes = function(element, attributes) {
+  for (var key in attributes) {
+    if (attributes.hasOwnProperty(key)) {
+      element.setAttribute(key, attributes[key]);
+    }
+  }
+};
+
+
+/**
+ * Creates an instance of the MSXML2.DOMDocument.
+ * @return {Document} The new document.
+ * @private
+ */
+goog.dom.xml.createMsXmlDocument_ = function() {
+  var doc = new ActiveXObject('MSXML2.DOMDocument');
+  if (doc) {
+    // Prevent potential vulnerabilities exposed by MSXML2, see
+    // http://b/1707300 and http://wiki/Main/ISETeamXMLAttacks for details.
+    doc.resolveExternals = false;
+    doc.validateOnParse = false;
+    // Add a try catch block because accessing these properties will throw an
+    // error on unsupported MSXML versions. This affects Windows machines
+    // running IE6 or IE7 that are on XP SP2 or earlier without MSXML updates.
+    // See http://msdn.microsoft.com/en-us/library/ms766391(VS.85).aspx for
+    // specific details on which MSXML versions support these properties.
+    try {
+      doc.setProperty('ProhibitDTD', true);
+      doc.setProperty('MaxXMLSize', goog.dom.xml.MAX_XML_SIZE_KB);
+      doc.setProperty('MaxElementDepth', goog.dom.xml.MAX_ELEMENT_DEPTH);
+    } catch (e) {
+      // No-op.
+    }
+  }
+  return doc;
+};
+
+goog.provide('ol.xml');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.dom.NodeType');
+goog.require('goog.dom.xml');
+goog.require('goog.object');
+goog.require('goog.userAgent');
+
+
+/**
+ * When using {@link ol.xml.makeChildAppender} or
+ * {@link ol.xml.makeSimpleNodeFactory}, the top `objectStack` item needs to
+ * have this structure.
+ * @typedef {{node:Node}}
+ */
+ol.xml.NodeStackItem;
+
+
+/**
+ * @typedef {function(Node, Array.<*>)}
+ */
+ol.xml.Parser;
+
+
+/**
+ * @typedef {function(Node, *, Array.<*>)}
+ */
+ol.xml.Serializer;
+
+
+/**
+ * This document should be used when creating nodes for XML serializations. This
+ * document is also used by {@link ol.xml.createElementNS} and
+ * {@link ol.xml.setAttributeNS}
+ * @const
+ * @type {Document}
+ */
+ol.xml.DOCUMENT = goog.dom.xml.createDocument();
+
+
+/**
+ * @param {string} namespaceURI Namespace URI.
+ * @param {string} qualifiedName Qualified name.
+ * @return {Node} Node.
+ * @private
+ */
+ol.xml.createElementNS_ = function(namespaceURI, qualifiedName) {
+  return ol.xml.DOCUMENT.createElementNS(namespaceURI, qualifiedName);
+};
+
+
+/**
+ * @param {string} namespaceURI Namespace URI.
+ * @param {string} qualifiedName Qualified name.
+ * @return {Node} Node.
+ * @private
+ */
+ol.xml.createElementNSActiveX_ = function(namespaceURI, qualifiedName) {
+  if (!namespaceURI) {
+    namespaceURI = '';
+  }
+  return ol.xml.DOCUMENT.createNode(1, qualifiedName, namespaceURI);
+};
+
+
+/**
+ * @param {string} namespaceURI Namespace URI.
+ * @param {string} qualifiedName Qualified name.
+ * @return {Node} Node.
+ */
+ol.xml.createElementNS =
+    (document.implementation && document.implementation.createDocument) ?
+        ol.xml.createElementNS_ : ol.xml.createElementNSActiveX_;
+
+
+/**
+ * Recursively grab all text content of child nodes into a single string.
+ * @param {Node} node Node.
+ * @param {boolean} normalizeWhitespace Normalize whitespace: remove all line
+ * breaks.
+ * @return {string} All text content.
+ * @api
+ */
+ol.xml.getAllTextContent = function(node, normalizeWhitespace) {
+  return ol.xml.getAllTextContent_(node, normalizeWhitespace, []).join('');
+};
+
+
+/**
+ * Recursively grab all text content of child nodes into a single string.
+ * @param {Node} node Node.
+ * @param {boolean} normalizeWhitespace Normalize whitespace: remove all line
+ * breaks.
+ * @param {Array.<String|string>} accumulator Accumulator.
+ * @private
+ * @return {Array.<String|string>} Accumulator.
+ */
+ol.xml.getAllTextContent_ = function(node, normalizeWhitespace, accumulator) {
+  if (node.nodeType == goog.dom.NodeType.CDATA_SECTION ||
+      node.nodeType == goog.dom.NodeType.TEXT) {
+    if (normalizeWhitespace) {
+      // FIXME understand why goog.dom.getTextContent_ uses String here
+      accumulator.push(String(node.nodeValue).replace(/(\r\n|\r|\n)/g, ''));
+    } else {
+      accumulator.push(node.nodeValue);
+    }
+  } else {
+    var n;
+    for (n = node.firstChild; n; n = n.nextSibling) {
+      ol.xml.getAllTextContent_(n, normalizeWhitespace, accumulator);
+    }
+  }
+  return accumulator;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @private
+ * @return {string} Local name.
+ */
+ol.xml.getLocalName_ = function(node) {
+  return node.localName;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @private
+ * @return {string} Local name.
+ */
+ol.xml.getLocalNameIE_ = function(node) {
+  var localName = node.localName;
+  if (localName !== undefined) {
+    return localName;
+  }
+  var baseName = node.baseName;
+  goog.asserts.assert(baseName,
+      'Failed to get localName/baseName of node %s', node);
+  return baseName;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @return {string} Local name.
+ */
+ol.xml.getLocalName = goog.userAgent.IE ?
+    ol.xml.getLocalNameIE_ : ol.xml.getLocalName_;
+
+
+/**
+ * @param {?} value Value.
+ * @private
+ * @return {boolean} Is document.
+ */
+ol.xml.isDocument_ = function(value) {
+  return value instanceof Document;
+};
+
+
+/**
+ * @param {?} value Value.
+ * @private
+ * @return {boolean} Is document.
+ */
+ol.xml.isDocumentIE_ = function(value) {
+  return goog.isObject(value) && value.nodeType == goog.dom.NodeType.DOCUMENT;
+};
+
+
+/**
+ * @param {?} value Value.
+ * @return {boolean} Is document.
+ */
+ol.xml.isDocument = goog.userAgent.IE ?
+    ol.xml.isDocumentIE_ : ol.xml.isDocument_;
+
+
+/**
+ * @param {?} value Value.
+ * @private
+ * @return {boolean} Is node.
+ */
+ol.xml.isNode_ = function(value) {
+  return value instanceof Node;
+};
+
+
+/**
+ * @param {?} value Value.
+ * @private
+ * @return {boolean} Is node.
+ */
+ol.xml.isNodeIE_ = function(value) {
+  return goog.isObject(value) && value.nodeType !== undefined;
+};
+
+
+/**
+ * @param {?} value Value.
+ * @return {boolean} Is node.
+ */
+ol.xml.isNode = goog.userAgent.IE ? ol.xml.isNodeIE_ : ol.xml.isNode_;
+
+
+/**
+ * @param {Node} node Node.
+ * @param {?string} namespaceURI Namespace URI.
+ * @param {string} name Attribute name.
+ * @return {string} Value
+ * @private
+ */
+ol.xml.getAttributeNS_ = function(node, namespaceURI, name) {
+  return node.getAttributeNS(namespaceURI, name) || '';
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {?string} namespaceURI Namespace URI.
+ * @param {string} name Attribute name.
+ * @return {string} Value
+ * @private
+ */
+ol.xml.getAttributeNSActiveX_ = function(node, namespaceURI, name) {
+  var attributeValue = '';
+  var attributeNode = ol.xml.getAttributeNodeNS(node, namespaceURI, name);
+  if (attributeNode !== undefined) {
+    attributeValue = attributeNode.nodeValue;
+  }
+  return attributeValue;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {?string} namespaceURI Namespace URI.
+ * @param {string} name Attribute name.
+ * @return {string} Value
+ */
+ol.xml.getAttributeNS =
+    (document.implementation && document.implementation.createDocument) ?
+        ol.xml.getAttributeNS_ : ol.xml.getAttributeNSActiveX_;
+
+
+/**
+ * @param {Node} node Node.
+ * @param {?string} namespaceURI Namespace URI.
+ * @param {string} name Attribute name.
+ * @return {?Node} Attribute node or null if none found.
+ * @private
+ */
+ol.xml.getAttributeNodeNS_ = function(node, namespaceURI, name) {
+  return node.getAttributeNodeNS(namespaceURI, name);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {?string} namespaceURI Namespace URI.
+ * @param {string} name Attribute name.
+ * @return {?Node} Attribute node or null if none found.
+ * @private
+ */
+ol.xml.getAttributeNodeNSActiveX_ = function(node, namespaceURI, name) {
+  var attributeNode = null;
+  var attributes = node.attributes;
+  var potentialNode, fullName;
+  for (var i = 0, len = attributes.length; i < len; ++i) {
+    potentialNode = attributes[i];
+    if (potentialNode.namespaceURI == namespaceURI) {
+      fullName = (potentialNode.prefix) ?
+          (potentialNode.prefix + ':' + name) : name;
+      if (fullName == potentialNode.nodeName) {
+        attributeNode = potentialNode;
+        break;
+      }
+    }
+  }
+  return attributeNode;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {?string} namespaceURI Namespace URI.
+ * @param {string} name Attribute name.
+ * @return {?Node} Attribute node or null if none found.
+ */
+ol.xml.getAttributeNodeNS =
+    (document.implementation && document.implementation.createDocument) ?
+        ol.xml.getAttributeNodeNS_ : ol.xml.getAttributeNodeNSActiveX_;
+
+
+/**
+ * @param {Node} node Node.
+ * @param {?string} namespaceURI Namespace URI.
+ * @param {string} name Attribute name.
+ * @param {string|number} value Value.
+ * @private
+ */
+ol.xml.setAttributeNS_ = function(node, namespaceURI, name, value) {
+  node.setAttributeNS(namespaceURI, name, value);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {?string} namespaceURI Namespace URI.
+ * @param {string} name Attribute name.
+ * @param {string|number} value Value.
+ * @private
+ */
+ol.xml.setAttributeNSActiveX_ = function(node, namespaceURI, name, value) {
+  if (namespaceURI) {
+    var attribute = node.ownerDocument.createNode(2, name, namespaceURI);
+    attribute.nodeValue = value;
+    node.setAttributeNode(attribute);
+  } else {
+    node.setAttribute(name, value);
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {?string} namespaceURI Namespace URI.
+ * @param {string} name Attribute name.
+ * @param {string|number} value Value.
+ */
+ol.xml.setAttributeNS =
+    (document.implementation && document.implementation.createDocument) ?
+        ol.xml.setAttributeNS_ : ol.xml.setAttributeNSActiveX_;
+
+
+/**
+ * Parse an XML string to an XML Document.
+ * @param {string} xml XML.
+ * @return {Document} Document.
+ * @api
+ */
+ol.xml.parse = function(xml) {
+  return new DOMParser().parseFromString(xml, 'application/xml');
+};
+
+
+/**
+ * Make an array extender function for extending the array at the top of the
+ * object stack.
+ * @param {function(this: T, Node, Array.<*>): (Array.<*>|undefined)}
+ *     valueReader Value reader.
+ * @param {T=} opt_this The object to use as `this` in `valueReader`.
+ * @return {ol.xml.Parser} Parser.
+ * @template T
+ */
+ol.xml.makeArrayExtender = function(valueReader, opt_this) {
+  return (
+      /**
+       * @param {Node} node Node.
+       * @param {Array.<*>} objectStack Object stack.
+       */
+      function(node, objectStack) {
+        var value = valueReader.call(opt_this, node, objectStack);
+        if (value !== undefined) {
+          goog.asserts.assert(goog.isArray(value),
+              'valueReader function is expected to return an array of values');
+          var array = /** @type {Array.<*>} */
+              (objectStack[objectStack.length - 1]);
+          goog.asserts.assert(goog.isArray(array),
+              'objectStack is supposed to be an array of arrays');
+          goog.array.extend(array, value);
+        }
+      });
+};
+
+
+/**
+ * Make an array pusher function for pushing to the array at the top of the
+ * object stack.
+ * @param {function(this: T, Node, Array.<*>): *} valueReader Value reader.
+ * @param {T=} opt_this The object to use as `this` in `valueReader`.
+ * @return {ol.xml.Parser} Parser.
+ * @template T
+ */
+ol.xml.makeArrayPusher = function(valueReader, opt_this) {
+  return (
+      /**
+       * @param {Node} node Node.
+       * @param {Array.<*>} objectStack Object stack.
+       */
+      function(node, objectStack) {
+        var value = valueReader.call(opt_this !== undefined ? opt_this : this,
+            node, objectStack);
+        if (value !== undefined) {
+          var array = objectStack[objectStack.length - 1];
+          goog.asserts.assert(goog.isArray(array),
+              'objectStack is supposed to be an array of arrays');
+          array.push(value);
+        }
+      });
+};
+
+
+/**
+ * Make an object stack replacer function for replacing the object at the
+ * top of the stack.
+ * @param {function(this: T, Node, Array.<*>): *} valueReader Value reader.
+ * @param {T=} opt_this The object to use as `this` in `valueReader`.
+ * @return {ol.xml.Parser} Parser.
+ * @template T
+ */
+ol.xml.makeReplacer = function(valueReader, opt_this) {
+  return (
+      /**
+       * @param {Node} node Node.
+       * @param {Array.<*>} objectStack Object stack.
+       */
+      function(node, objectStack) {
+        var value = valueReader.call(opt_this !== undefined ? opt_this : this,
+            node, objectStack);
+        if (value !== undefined) {
+          objectStack[objectStack.length - 1] = value;
+        }
+      });
+};
+
+
+/**
+ * Make an object property pusher function for adding a property to the
+ * object at the top of the stack.
+ * @param {function(this: T, Node, Array.<*>): *} valueReader Value reader.
+ * @param {string=} opt_property Property.
+ * @param {T=} opt_this The object to use as `this` in `valueReader`.
+ * @return {ol.xml.Parser} Parser.
+ * @template T
+ */
+ol.xml.makeObjectPropertyPusher =
+    function(valueReader, opt_property, opt_this) {
+  goog.asserts.assert(valueReader !== undefined,
+      'undefined valueReader, expected function(this: T, Node, Array.<*>)');
+  return (
+      /**
+       * @param {Node} node Node.
+       * @param {Array.<*>} objectStack Object stack.
+       */
+      function(node, objectStack) {
+        var value = valueReader.call(opt_this !== undefined ? opt_this : this,
+            node, objectStack);
+        if (value !== undefined) {
+          var object = /** @type {Object} */
+              (objectStack[objectStack.length - 1]);
+          var property = opt_property !== undefined ?
+              opt_property : node.localName;
+          goog.asserts.assert(goog.isObject(object),
+              'entity from stack was not an object');
+          var array = goog.object.setIfUndefined(object, property, []);
+          array.push(value);
+        }
+      });
+};
+
+
+/**
+ * Make an object property setter function.
+ * @param {function(this: T, Node, Array.<*>): *} valueReader Value reader.
+ * @param {string=} opt_property Property.
+ * @param {T=} opt_this The object to use as `this` in `valueReader`.
+ * @return {ol.xml.Parser} Parser.
+ * @template T
+ */
+ol.xml.makeObjectPropertySetter =
+    function(valueReader, opt_property, opt_this) {
+  goog.asserts.assert(valueReader !== undefined,
+      'undefined valueReader, expected function(this: T, Node, Array.<*>)');
+  return (
+      /**
+       * @param {Node} node Node.
+       * @param {Array.<*>} objectStack Object stack.
+       */
+      function(node, objectStack) {
+        var value = valueReader.call(opt_this !== undefined ? opt_this : this,
+            node, objectStack);
+        if (value !== undefined) {
+          var object = /** @type {Object} */
+              (objectStack[objectStack.length - 1]);
+          var property = opt_property !== undefined ?
+              opt_property : node.localName;
+          goog.asserts.assert(goog.isObject(object),
+              'entity from stack was not an object');
+          object[property] = value;
+        }
+      });
+};
+
+
+/**
+ * Create a serializer that appends nodes written by its `nodeWriter` to its
+ * designated parent. The parent is the `node` of the
+ * {@link ol.xml.NodeStackItem} at the top of the `objectStack`.
+ * @param {function(this: T, Node, V, Array.<*>)}
+ *     nodeWriter Node writer.
+ * @param {T=} opt_this The object to use as `this` in `nodeWriter`.
+ * @return {ol.xml.Serializer} Serializer.
+ * @template T, V
+ */
+ol.xml.makeChildAppender = function(nodeWriter, opt_this) {
+  return function(node, value, objectStack) {
+    nodeWriter.call(opt_this !== undefined ? opt_this : this,
+        node, value, objectStack);
+    var parent = objectStack[objectStack.length - 1];
+    goog.asserts.assert(goog.isObject(parent),
+        'entity from stack was not an object');
+    var parentNode = parent.node;
+    goog.asserts.assert(ol.xml.isNode(parentNode) ||
+        ol.xml.isDocument(parentNode),
+        'expected parentNode %s to be a Node or a Document', parentNode);
+    parentNode.appendChild(node);
+  };
+};
+
+
+/**
+ * Create a serializer that calls the provided `nodeWriter` from
+ * {@link ol.xml.serialize}. This can be used by the parent writer to have the
+ * 'nodeWriter' called with an array of values when the `nodeWriter` was
+ * designed to serialize a single item. An example would be a LineString
+ * geometry writer, which could be reused for writing MultiLineString
+ * geometries.
+ * @param {function(this: T, Node, V, Array.<*>)}
+ *     nodeWriter Node writer.
+ * @param {T=} opt_this The object to use as `this` in `nodeWriter`.
+ * @return {ol.xml.Serializer} Serializer.
+ * @template T, V
+ */
+ol.xml.makeArraySerializer = function(nodeWriter, opt_this) {
+  var serializersNS, nodeFactory;
+  return function(node, value, objectStack) {
+    if (serializersNS === undefined) {
+      serializersNS = {};
+      var serializers = {};
+      serializers[node.localName] = nodeWriter;
+      serializersNS[node.namespaceURI] = serializers;
+      nodeFactory = ol.xml.makeSimpleNodeFactory(node.localName);
+    }
+    ol.xml.serialize(serializersNS, nodeFactory, value, objectStack);
+  };
+};
+
+
+/**
+ * Create a node factory which can use the `opt_keys` passed to
+ * {@link ol.xml.serialize} or {@link ol.xml.pushSerializeAndPop} as node names,
+ * or a fixed node name. The namespace of the created nodes can either be fixed,
+ * or the parent namespace will be used.
+ * @param {string=} opt_nodeName Fixed node name which will be used for all
+ *     created nodes. If not provided, the 3rd argument to the resulting node
+ *     factory needs to be provided and will be the nodeName.
+ * @param {string=} opt_namespaceURI Fixed namespace URI which will be used for
+ *     all created nodes. If not provided, the namespace of the parent node will
+ *     be used.
+ * @return {function(*, Array.<*>, string=): (Node|undefined)} Node factory.
+ */
+ol.xml.makeSimpleNodeFactory = function(opt_nodeName, opt_namespaceURI) {
+  var fixedNodeName = opt_nodeName;
+  return (
+      /**
+       * @param {*} value Value.
+       * @param {Array.<*>} objectStack Object stack.
+       * @param {string=} opt_nodeName Node name.
+       * @return {Node} Node.
+       */
+      function(value, objectStack, opt_nodeName) {
+        var context = objectStack[objectStack.length - 1];
+        var node = context.node;
+        goog.asserts.assert(ol.xml.isNode(node) || ol.xml.isDocument(node),
+            'expected node %s to be a Node or a Document', node);
+        var nodeName = fixedNodeName;
+        if (nodeName === undefined) {
+          nodeName = opt_nodeName;
+        }
+        var namespaceURI = opt_namespaceURI;
+        if (opt_namespaceURI === undefined) {
+          namespaceURI = node.namespaceURI;
+        }
+        goog.asserts.assert(nodeName !== undefined, 'nodeName was undefined');
+        return ol.xml.createElementNS(namespaceURI, nodeName);
+      }
+  );
+};
+
+
+/**
+ * A node factory that creates a node using the parent's `namespaceURI` and the
+ * `nodeName` passed by {@link ol.xml.serialize} or
+ * {@link ol.xml.pushSerializeAndPop} to the node factory.
+ * @const
+ * @type {function(*, Array.<*>, string=): (Node|undefined)}
+ */
+ol.xml.OBJECT_PROPERTY_NODE_FACTORY = ol.xml.makeSimpleNodeFactory();
+
+
+/**
+ * Create an array of `values` to be used with {@link ol.xml.serialize} or
+ * {@link ol.xml.pushSerializeAndPop}, where `orderedKeys` has to be provided as
+ * `opt_key` argument.
+ * @param {Object.<string, V>} object Key-value pairs for the sequence. Keys can
+ *     be a subset of the `orderedKeys`.
+ * @param {Array.<string>} orderedKeys Keys in the order of the sequence.
+ * @return {Array.<V>} Values in the order of the sequence. The resulting array
+ *     has the same length as the `orderedKeys` array. Values that are not
+ *     present in `object` will be `undefined` in the resulting array.
+ * @template V
+ */
+ol.xml.makeSequence = function(object, orderedKeys) {
+  var length = orderedKeys.length;
+  var sequence = new Array(length);
+  for (var i = 0; i < length; ++i) {
+    sequence[i] = object[orderedKeys[i]];
+  }
+  return sequence;
+};
+
+
+/**
+ * Create a namespaced structure, using the same values for each namespace.
+ * This can be used as a starting point for versioned parsers, when only a few
+ * values are version specific.
+ * @param {Array.<string>} namespaceURIs Namespace URIs.
+ * @param {T} structure Structure.
+ * @param {Object.<string, T>=} opt_structureNS Namespaced structure to add to.
+ * @return {Object.<string, T>} Namespaced structure.
+ * @template T
+ */
+ol.xml.makeStructureNS = function(namespaceURIs, structure, opt_structureNS) {
+  /**
+   * @type {Object.<string, *>}
+   */
+  var structureNS = opt_structureNS !== undefined ? opt_structureNS : {};
+  var i, ii;
+  for (i = 0, ii = namespaceURIs.length; i < ii; ++i) {
+    structureNS[namespaceURIs[i]] = structure;
+  }
+  return structureNS;
+};
+
+
+/**
+ * Parse a node using the parsers and object stack.
+ * @param {Object.<string, Object.<string, ol.xml.Parser>>} parsersNS
+ *     Parsers by namespace.
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @param {*=} opt_this The object to use as `this`.
+ */
+ol.xml.parseNode = function(parsersNS, node, objectStack, opt_this) {
+  var n;
+  for (n = node.firstElementChild; n; n = n.nextElementSibling) {
+    var parsers = parsersNS[n.namespaceURI];
+    if (parsers !== undefined) {
+      var parser = parsers[n.localName];
+      if (parser !== undefined) {
+        parser.call(opt_this, n, objectStack);
+      }
+    }
+  }
+};
+
+
+/**
+ * Push an object on top of the stack, parse and return the popped object.
+ * @param {T} object Object.
+ * @param {Object.<string, Object.<string, ol.xml.Parser>>} parsersNS
+ *     Parsers by namespace.
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @param {*=} opt_this The object to use as `this`.
+ * @return {T} Object.
+ * @template T
+ */
+ol.xml.pushParseAndPop = function(
+    object, parsersNS, node, objectStack, opt_this) {
+  objectStack.push(object);
+  ol.xml.parseNode(parsersNS, node, objectStack, opt_this);
+  return objectStack.pop();
+};
+
+
+/**
+ * Walk through an array of `values` and call a serializer for each value.
+ * @param {Object.<string, Object.<string, ol.xml.Serializer>>} serializersNS
+ *     Namespaced serializers.
+ * @param {function(this: T, *, Array.<*>, (string|undefined)): (Node|undefined)} nodeFactory
+ *     Node factory. The `nodeFactory` creates the node whose namespace and name
+ *     will be used to choose a node writer from `serializersNS`. This
+ *     separation allows us to decide what kind of node to create, depending on
+ *     the value we want to serialize. An example for this would be different
+ *     geometry writers based on the geometry type.
+ * @param {Array.<*>} values Values to serialize. An example would be an array
+ *     of {@link ol.Feature} instances.
+ * @param {Array.<*>} objectStack Node stack.
+ * @param {Array.<string>=} opt_keys Keys of the `values`. Will be passed to the
+ *     `nodeFactory`. This is used for serializing object literals where the
+ *     node name relates to the property key. The array length of `opt_keys` has
+ *     to match the length of `values`. For serializing a sequence, `opt_keys`
+ *     determines the order of the sequence.
+ * @param {T=} opt_this The object to use as `this` for the node factory and
+ *     serializers.
+ * @template T
+ */
+ol.xml.serialize = function(
+    serializersNS, nodeFactory, values, objectStack, opt_keys, opt_this) {
+  var length = (opt_keys !== undefined ? opt_keys : values).length;
+  var value, node;
+  for (var i = 0; i < length; ++i) {
+    value = values[i];
+    if (value !== undefined) {
+      node = nodeFactory.call(opt_this, value, objectStack,
+          opt_keys !== undefined ? opt_keys[i] : undefined);
+      if (node !== undefined) {
+        serializersNS[node.namespaceURI][node.localName]
+            .call(opt_this, node, value, objectStack);
+      }
+    }
+  }
+};
+
+
+/**
+ * @param {O} object Object.
+ * @param {Object.<string, Object.<string, ol.xml.Serializer>>} serializersNS
+ *     Namespaced serializers.
+ * @param {function(this: T, *, Array.<*>, (string|undefined)): (Node|undefined)} nodeFactory
+ *     Node factory. The `nodeFactory` creates the node whose namespace and name
+ *     will be used to choose a node writer from `serializersNS`. This
+ *     separation allows us to decide what kind of node to create, depending on
+ *     the value we want to serialize. An example for this would be different
+ *     geometry writers based on the geometry type.
+ * @param {Array.<*>} values Values to serialize. An example would be an array
+ *     of {@link ol.Feature} instances.
+ * @param {Array.<*>} objectStack Node stack.
+ * @param {Array.<string>=} opt_keys Keys of the `values`. Will be passed to the
+ *     `nodeFactory`. This is used for serializing object literals where the
+ *     node name relates to the property key. The array length of `opt_keys` has
+ *     to match the length of `values`. For serializing a sequence, `opt_keys`
+ *     determines the order of the sequence.
+ * @param {T=} opt_this The object to use as `this` for the node factory and
+ *     serializers.
+ * @return {O|undefined} Object.
+ * @template O, T
+ */
+ol.xml.pushSerializeAndPop = function(object,
+    serializersNS, nodeFactory, values, objectStack, opt_keys, opt_this) {
+  objectStack.push(object);
+  ol.xml.serialize(
+      serializersNS, nodeFactory, values, objectStack, opt_keys, opt_this);
+  return objectStack.pop();
+};
+
+goog.provide('ol.FeatureLoader');
+goog.provide('ol.FeatureUrlFunction');
+goog.provide('ol.featureloader');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.net.EventType');
+goog.require('goog.net.XhrIo');
+goog.require('goog.net.XhrIo.ResponseType');
+goog.require('ol.TileState');
+goog.require('ol.VectorTile');
+goog.require('ol.format.FormatType');
+goog.require('ol.proj');
+goog.require('ol.proj.Projection');
+goog.require('ol.proj.Units');
+goog.require('ol.xml');
+
+
+/**
+ * {@link ol.source.Vector} sources use a function of this type to load
+ * features.
+ *
+ * This function takes an {@link ol.Extent} representing the area to be loaded,
+ * a `{number}` representing the resolution (map units per pixel) and an
+ * {@link ol.proj.Projection} for the projection  as arguments. `this` within
+ * the function is bound to the {@link ol.source.Vector} it's called from.
+ *
+ * The function is responsible for loading the features and adding them to the
+ * source.
+ * @api
+ * @typedef {function(this:ol.source.Vector, ol.Extent, number,
+ *                    ol.proj.Projection)}
+ */
+ol.FeatureLoader;
+
+
+/**
+ * {@link ol.source.Vector} sources use a function of this type to get the url
+ * to load features from.
+ *
+ * This function takes an {@link ol.Extent} representing the area to be loaded,
+ * a `{number}` representing the resolution (map units per pixel) and an
+ * {@link ol.proj.Projection} for the projection  as arguments and returns a
+ * `{string}` representing the URL.
+ * @api
+ * @typedef {function(ol.Extent, number, ol.proj.Projection) : string}
+ */
+ol.FeatureUrlFunction;
+
+
+/**
+ * @param {string|ol.FeatureUrlFunction} url Feature URL service.
+ * @param {ol.format.Feature} format Feature format.
+ * @param {function(this:ol.VectorTile, Array.<ol.Feature>, ol.proj.Projection)|function(this:ol.source.Vector, Array.<ol.Feature>)} success
+ *     Function called with the loaded features and optionally with the data
+ *     projection. Called with the vector tile or source as `this`.
+ * @param {function(this:ol.VectorTile)|function(this:ol.source.Vector)} failure
+ *     Function called when loading failed. Called with the vector tile or
+ *     source as `this`.
+ * @return {ol.FeatureLoader} The feature loader.
+ */
+ol.featureloader.loadFeaturesXhr = function(url, format, success, failure) {
+  return (
+      /**
+       * @param {ol.Extent} extent Extent.
+       * @param {number} resolution Resolution.
+       * @param {ol.proj.Projection} projection Projection.
+       * @this {ol.source.Vector|ol.VectorTile}
+       */
+      function(extent, resolution, projection) {
+        var xhrIo = new goog.net.XhrIo();
+        xhrIo.setResponseType(
+            format.getType() == ol.format.FormatType.ARRAY_BUFFER ?
+                goog.net.XhrIo.ResponseType.ARRAY_BUFFER :
+                goog.net.XhrIo.ResponseType.TEXT);
+        goog.events.listen(xhrIo, goog.net.EventType.COMPLETE,
+            /**
+             * @param {Event} event Event.
+             * @private
+             * @this {ol.source.Vector}
+             */
+            function(event) {
+              var xhrIo = event.target;
+              goog.asserts.assertInstanceof(xhrIo, goog.net.XhrIo,
+                  'event.target/xhrIo is an instance of goog.net.XhrIo');
+              if (xhrIo.isSuccess()) {
+                var type = format.getType();
+                /** @type {Document|Node|Object|string|undefined} */
+                var source;
+                if (type == ol.format.FormatType.JSON) {
+                  source = xhrIo.getResponseText();
+                } else if (type == ol.format.FormatType.TEXT) {
+                  source = xhrIo.getResponseText();
+                } else if (type == ol.format.FormatType.XML) {
+                  if (!goog.userAgent.IE) {
+                    source = xhrIo.getResponseXml();
+                  }
+                  if (!source) {
+                    source = ol.xml.parse(xhrIo.getResponseText());
+                  }
+                } else if (type == ol.format.FormatType.ARRAY_BUFFER) {
+                  source = xhrIo.getResponse();
+                } else {
+                  goog.asserts.fail('unexpected format type');
+                }
+                if (source) {
+                  if (ol.ENABLE_VECTOR_TILE && this instanceof ol.VectorTile) {
+                    var dataUnits = format.readProjection(source).getUnits();
+                    if (dataUnits === ol.proj.Units.TILE_PIXELS) {
+                      projection = new ol.proj.Projection({
+                        code: this.getProjection().getCode(),
+                        units: dataUnits
+                      });
+                      this.setProjection(projection);
+                    }
+                  }
+                  success.call(this, format.readFeatures(source,
+                      {featureProjection: projection}));
+                } else {
+                  goog.asserts.fail('undefined or null source');
+                }
+              } else {
+                failure.call(this);
+              }
+              goog.dispose(xhrIo);
+            }, false, this);
+        if (goog.isFunction(url)) {
+          xhrIo.send(url(extent, resolution, projection));
+        } else {
+          xhrIo.send(url);
+        }
+
+      });
+};
+
+
+/**
+ * Create an XHR feature loader for a `url` and `format`. The feature loader
+ * loads features (with XHR), parses the features, and adds them to the
+ * vector tile.
+ * @param {string|ol.FeatureUrlFunction} url Feature URL service.
+ * @param {ol.format.Feature} format Feature format.
+ * @return {ol.FeatureLoader} The feature loader.
+ * @api
+ */
+ol.featureloader.tile = function(url, format) {
+  return ol.featureloader.loadFeaturesXhr(url, format,
+      /**
+       * @param {Array.<ol.Feature>} features The loaded features.
+       * @this {ol.VectorTile}
+       */
+      function(features) {
+        this.setFeatures(features);
+      },
+      /**
+       * @this {ol.VectorTile}
+       */
+      function() {
+        this.setState(ol.TileState.ERROR);
+      });
+};
+
+
+/**
+ * Create an XHR feature loader for a `url` and `format`. The feature loader
+ * loads features (with XHR), parses the features, and adds them to the
+ * vector source.
+ * @param {string|ol.FeatureUrlFunction} url Feature URL service.
+ * @param {ol.format.Feature} format Feature format.
+ * @return {ol.FeatureLoader} The feature loader.
+ * @api
+ */
+ol.featureloader.xhr = function(url, format) {
+  return ol.featureloader.loadFeaturesXhr(url, format,
+      /**
+       * @param {Array.<ol.Feature>} features The loaded features.
+       * @this {ol.source.Vector}
+       */
+      function(features) {
+        this.addFeatures(features);
+      }, /* FIXME handle error */ ol.nullFunction);
+};
+
+goog.provide('ol.LoadingStrategy');
+goog.provide('ol.loadingstrategy');
+
+goog.require('ol.TileCoord');
+
+
+/**
+ * @typedef {function(ol.Extent, number): Array.<ol.Extent>}
+ * @api
+ */
+ol.LoadingStrategy;
+
+
+/**
+ * Strategy function for loading all features with a single request.
+ * @param {ol.Extent} extent Extent.
+ * @param {number} resolution Resolution.
+ * @return {Array.<ol.Extent>} Extents.
+ * @api
+ */
+ol.loadingstrategy.all = function(extent, resolution) {
+  return [[-Infinity, -Infinity, Infinity, Infinity]];
+};
+
+
+/**
+ * Strategy function for loading features based on the view's extent and
+ * resolution.
+ * @param {ol.Extent} extent Extent.
+ * @param {number} resolution Resolution.
+ * @return {Array.<ol.Extent>} Extents.
+ * @api
+ */
+ol.loadingstrategy.bbox = function(extent, resolution) {
+  return [extent];
+};
+
+
+/**
+ * Creates a strategy function for loading features based on a tile grid.
+ * @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
+ * @return {function(ol.Extent, number): Array.<ol.Extent>} Loading strategy.
+ * @api
+ */
+ol.loadingstrategy.tile = function(tileGrid) {
+  return (
+      /**
+       * @param {ol.Extent} extent Extent.
+       * @param {number} resolution Resolution.
+       * @return {Array.<ol.Extent>} Extents.
+       */
+      function(extent, resolution) {
+        var z = tileGrid.getZForResolution(resolution);
+        var tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z);
+        /** @type {Array.<ol.Extent>} */
+        var extents = [];
+        /** @type {ol.TileCoord} */
+        var tileCoord = [z, 0, 0];
+        for (tileCoord[1] = tileRange.minX; tileCoord[1] <= tileRange.maxX;
+             ++tileCoord[1]) {
+          for (tileCoord[2] = tileRange.minY; tileCoord[2] <= tileRange.maxY;
+               ++tileCoord[2]) {
+            extents.push(tileGrid.getTileCoordExtent(tileCoord));
+          }
+        }
+        return extents;
+      });
+};
+
+goog.provide('ol.ext.rbush');
+/** @typedef {function(*)} */
+ol.ext.rbush;
+(function() {
+var exports = {};
+var module = {exports: exports};
+var define;
+/**
+ * @fileoverview
+ * @suppress {accessControls, ambiguousFunctionDecl, checkDebuggerStatement, checkRegExp, checkTypes, checkVars, const, constantProperty, deprecated, duplicate, es5Strict, fileoverviewTags, missingProperties, nonStandardJsDocs, strictModuleDepCheck, suspiciousCode, undefinedNames, undefinedVars, unknownDefines, uselessCode, visibility}
+ */
+/*
+ (c) 2015, Vladimir Agafonkin
+ RBush, a JavaScript library for high-performance 2D spatial indexing of points and rectangles.
+ https://github.com/mourner/rbush
+*/
+
+(function () { 'use strict';
+
+function rbush(maxEntries, format) {
+
+    // jshint newcap: false, validthis: true
+    if (!(this instanceof rbush)) return new rbush(maxEntries, format);
+
+    // max entries in a node is 9 by default; min node fill is 40% for best performance
+    this._maxEntries = Math.max(4, maxEntries || 9);
+    this._minEntries = Math.max(2, Math.ceil(this._maxEntries * 0.4));
+
+    if (format) {
+        this._initFormat(format);
+    }
+
+    this.clear();
+}
+
+rbush.prototype = {
+
+    all: function () {
+        return this._all(this.data, []);
+    },
+
+    search: function (bbox) {
+
+        var node = this.data,
+            result = [],
+            toBBox = this.toBBox;
+
+        if (!intersects(bbox, node.bbox)) return result;
+
+        var nodesToSearch = [],
+            i, len, child, childBBox;
+
+        while (node) {
+            for (i = 0, len = node.children.length; i < len; i++) {
+
+                child = node.children[i];
+                childBBox = node.leaf ? toBBox(child) : child.bbox;
+
+                if (intersects(bbox, childBBox)) {
+                    if (node.leaf) result.push(child);
+                    else if (contains(bbox, childBBox)) this._all(child, result);
+                    else nodesToSearch.push(child);
+                }
+            }
+            node = nodesToSearch.pop();
+        }
+
+        return result;
+    },
+
+    collides: function (bbox) {
+
+        var node = this.data,
+            toBBox = this.toBBox;
+
+        if (!intersects(bbox, node.bbox)) return false;
+
+        var nodesToSearch = [],
+            i, len, child, childBBox;
+
+        while (node) {
+            for (i = 0, len = node.children.length; i < len; i++) {
+
+                child = node.children[i];
+                childBBox = node.leaf ? toBBox(child) : child.bbox;
+
+                if (intersects(bbox, childBBox)) {
+                    if (node.leaf || contains(bbox, childBBox)) return true;
+                    nodesToSearch.push(child);
+                }
+            }
+            node = nodesToSearch.pop();
+        }
+
+        return false;
+    },
+
+    load: function (data) {
+        if (!(data && data.length)) return this;
+
+        if (data.length < this._minEntries) {
+            for (var i = 0, len = data.length; i < len; i++) {
+                this.insert(data[i]);
+            }
+            return this;
+        }
+
+        // recursively build the tree with the given data from stratch using OMT algorithm
+        var node = this._build(data.slice(), 0, data.length - 1, 0);
+
+        if (!this.data.children.length) {
+            // save as is if tree is empty
+            this.data = node;
+
+        } else if (this.data.height === node.height) {
+            // split root if trees have the same height
+            this._splitRoot(this.data, node);
+
+        } else {
+            if (this.data.height < node.height) {
+                // swap trees if inserted one is bigger
+                var tmpNode = this.data;
+                this.data = node;
+                node = tmpNode;
+            }
+
+            // insert the small tree into the large tree at appropriate level
+            this._insert(node, this.data.height - node.height - 1, true);
+        }
+
+        return this;
+    },
+
+    insert: function (item) {
+        if (item) this._insert(item, this.data.height - 1);
+        return this;
+    },
+
+    clear: function () {
+        this.data = {
+            children: [],
+            height: 1,
+            bbox: empty(),
+            leaf: true
+        };
+        return this;
+    },
+
+    remove: function (item) {
+        if (!item) return this;
+
+        var node = this.data,
+            bbox = this.toBBox(item),
+            path = [],
+            indexes = [],
+            i, parent, index, goingUp;
+
+        // depth-first iterative tree traversal
+        while (node || path.length) {
+
+            if (!node) { // go up
+                node = path.pop();
+                parent = path[path.length - 1];
+                i = indexes.pop();
+                goingUp = true;
+            }
+
+            if (node.leaf) { // check current node
+                index = node.children.indexOf(item);
+
+                if (index !== -1) {
+                    // item found, remove the item and condense tree upwards
+                    node.children.splice(index, 1);
+                    path.push(node);
+                    this._condense(path);
+                    return this;
+                }
+            }
+
+            if (!goingUp && !node.leaf && contains(node.bbox, bbox)) { // go down
+                path.push(node);
+                indexes.push(i);
+                i = 0;
+                parent = node;
+                node = node.children[0];
+
+            } else if (parent) { // go right
+                i++;
+                node = parent.children[i];
+                goingUp = false;
+
+            } else node = null; // nothing found
+        }
+
+        return this;
+    },
+
+    toBBox: function (item) { return item; },
+
+    compareMinX: function (a, b) { return a[0] - b[0]; },
+    compareMinY: function (a, b) { return a[1] - b[1]; },
+
+    toJSON: function () { return this.data; },
+
+    fromJSON: function (data) {
+        this.data = data;
+        return this;
+    },
+
+    _all: function (node, result) {
+        var nodesToSearch = [];
+        while (node) {
+            if (node.leaf) result.push.apply(result, node.children);
+            else nodesToSearch.push.apply(nodesToSearch, node.children);
+
+            node = nodesToSearch.pop();
+        }
+        return result;
+    },
+
+    _build: function (items, left, right, height) {
+
+        var N = right - left + 1,
+            M = this._maxEntries,
+            node;
+
+        if (N <= M) {
+            // reached leaf level; return leaf
+            node = {
+                children: items.slice(left, right + 1),
+                height: 1,
+                bbox: null,
+                leaf: true
+            };
+            calcBBox(node, this.toBBox);
+            return node;
+        }
+
+        if (!height) {
+            // target height of the bulk-loaded tree
+            height = Math.ceil(Math.log(N) / Math.log(M));
+
+            // target number of root entries to maximize storage utilization
+            M = Math.ceil(N / Math.pow(M, height - 1));
+        }
+
+        // TODO eliminate recursion?
+
+        node = {
+            children: [],
+            height: height,
+            bbox: null
+        };
+
+        // split the items into M mostly square tiles
+
+        var N2 = Math.ceil(N / M),
+            N1 = N2 * Math.ceil(Math.sqrt(M)),
+            i, j, right2, right3;
+
+        multiSelect(items, left, right, N1, this.compareMinX);
+
+        for (i = left; i <= right; i += N1) {
+
+            right2 = Math.min(i + N1 - 1, right);
+
+            multiSelect(items, i, right2, N2, this.compareMinY);
+
+            for (j = i; j <= right2; j += N2) {
+
+                right3 = Math.min(j + N2 - 1, right2);
+
+                // pack each entry recursively
+                node.children.push(this._build(items, j, right3, height - 1));
+            }
+        }
+
+        calcBBox(node, this.toBBox);
+
+        return node;
+    },
+
+    _chooseSubtree: function (bbox, node, level, path) {
+
+        var i, len, child, targetNode, area, enlargement, minArea, minEnlargement;
+
+        while (true) {
+            path.push(node);
+
+            if (node.leaf || path.length - 1 === level) break;
+
+            minArea = minEnlargement = Infinity;
+
+            for (i = 0, len = node.children.length; i < len; i++) {
+                child = node.children[i];
+                area = bboxArea(child.bbox);
+                enlargement = enlargedArea(bbox, child.bbox) - area;
+
+                // choose entry with the least area enlargement
+                if (enlargement < minEnlargement) {
+                    minEnlargement = enlargement;
+                    minArea = area < minArea ? area : minArea;
+                    targetNode = child;
+
+                } else if (enlargement === minEnlargement) {
+                    // otherwise choose one with the smallest area
+                    if (area < minArea) {
+                        minArea = area;
+                        targetNode = child;
+                    }
+                }
+            }
+
+            node = targetNode;
+        }
+
+        return node;
+    },
+
+    _insert: function (item, level, isNode) {
+
+        var toBBox = this.toBBox,
+            bbox = isNode ? item.bbox : toBBox(item),
+            insertPath = [];
+
+        // find the best node for accommodating the item, saving all nodes along the path too
+        var node = this._chooseSubtree(bbox, this.data, level, insertPath);
+
+        // put the item into the node
+        node.children.push(item);
+        extend(node.bbox, bbox);
+
+        // split on node overflow; propagate upwards if necessary
+        while (level >= 0) {
+            if (insertPath[level].children.length > this._maxEntries) {
+                this._split(insertPath, level);
+                level--;
+            } else break;
+        }
+
+        // adjust bboxes along the insertion path
+        this._adjustParentBBoxes(bbox, insertPath, level);
+    },
+
+    // split overflowed node into two
+    _split: function (insertPath, level) {
+
+        var node = insertPath[level],
+            M = node.children.length,
+            m = this._minEntries;
+
+        this._chooseSplitAxis(node, m, M);
+
+        var splitIndex = this._chooseSplitIndex(node, m, M);
+
+        var newNode = {
+            children: node.children.splice(splitIndex, node.children.length - splitIndex),
+            height: node.height
+        };
+
+        if (node.leaf) newNode.leaf = true;
+
+        calcBBox(node, this.toBBox);
+        calcBBox(newNode, this.toBBox);
+
+        if (level) insertPath[level - 1].children.push(newNode);
+        else this._splitRoot(node, newNode);
+    },
+
+    _splitRoot: function (node, newNode) {
+        // split root node
+        this.data = {
+            children: [node, newNode],
+            height: node.height + 1
+        };
+        calcBBox(this.data, this.toBBox);
+    },
+
+    _chooseSplitIndex: function (node, m, M) {
+
+        var i, bbox1, bbox2, overlap, area, minOverlap, minArea, index;
+
+        minOverlap = minArea = Infinity;
+
+        for (i = m; i <= M - m; i++) {
+            bbox1 = distBBox(node, 0, i, this.toBBox);
+            bbox2 = distBBox(node, i, M, this.toBBox);
+
+            overlap = intersectionArea(bbox1, bbox2);
+            area = bboxArea(bbox1) + bboxArea(bbox2);
+
+            // choose distribution with minimum overlap
+            if (overlap < minOverlap) {
+                minOverlap = overlap;
+                index = i;
+
+                minArea = area < minArea ? area : minArea;
+
+            } else if (overlap === minOverlap) {
+                // otherwise choose distribution with minimum area
+                if (area < minArea) {
+                    minArea = area;
+                    index = i;
+                }
+            }
+        }
+
+        return index;
+    },
+
+    // sorts node children by the best axis for split
+    _chooseSplitAxis: function (node, m, M) {
+
+        var compareMinX = node.leaf ? this.compareMinX : compareNodeMinX,
+            compareMinY = node.leaf ? this.compareMinY : compareNodeMinY,
+            xMargin = this._allDistMargin(node, m, M, compareMinX),
+            yMargin = this._allDistMargin(node, m, M, compareMinY);
+
+        // if total distributions margin value is minimal for x, sort by minX,
+        // otherwise it's already sorted by minY
+        if (xMargin < yMargin) node.children.sort(compareMinX);
+    },
+
+    // total margin of all possible split distributions where each node is at least m full
+    _allDistMargin: function (node, m, M, compare) {
+
+        node.children.sort(compare);
+
+        var toBBox = this.toBBox,
+            leftBBox = distBBox(node, 0, m, toBBox),
+            rightBBox = distBBox(node, M - m, M, toBBox),
+            margin = bboxMargin(leftBBox) + bboxMargin(rightBBox),
+            i, child;
+
+        for (i = m; i < M - m; i++) {
+            child = node.children[i];
+            extend(leftBBox, node.leaf ? toBBox(child) : child.bbox);
+            margin += bboxMargin(leftBBox);
+        }
+
+        for (i = M - m - 1; i >= m; i--) {
+            child = node.children[i];
+            extend(rightBBox, node.leaf ? toBBox(child) : child.bbox);
+            margin += bboxMargin(rightBBox);
+        }
+
+        return margin;
+    },
+
+    _adjustParentBBoxes: function (bbox, path, level) {
+        // adjust bboxes along the given tree path
+        for (var i = level; i >= 0; i--) {
+            extend(path[i].bbox, bbox);
+        }
+    },
+
+    _condense: function (path) {
+        // go through the path, removing empty nodes and updating bboxes
+        for (var i = path.length - 1, siblings; i >= 0; i--) {
+            if (path[i].children.length === 0) {
+                if (i > 0) {
+                    siblings = path[i - 1].children;
+                    siblings.splice(siblings.indexOf(path[i]), 1);
+
+                } else this.clear();
+
+            } else calcBBox(path[i], this.toBBox);
+        }
+    },
+
+    _initFormat: function (format) {
+        // data format (minX, minY, maxX, maxY accessors)
+
+        // uses eval-type function compilation instead of just accepting a toBBox function
+        // because the algorithms are very sensitive to sorting functions performance,
+        // so they should be dead simple and without inner calls
+
+        // jshint evil: true
+
+        var compareArr = ['return a', ' - b', ';'];
+
+        this.compareMinX = new Function('a', 'b', compareArr.join(format[0]));
+        this.compareMinY = new Function('a', 'b', compareArr.join(format[1]));
+
+        this.toBBox = new Function('a', 'return [a' + format.join(', a') + '];');
+    }
+};
+
+
+// calculate node's bbox from bboxes of its children
+function calcBBox(node, toBBox) {
+    node.bbox = distBBox(node, 0, node.children.length, toBBox);
+}
+
+// min bounding rectangle of node children from k to p-1
+function distBBox(node, k, p, toBBox) {
+    var bbox = empty();
+
+    for (var i = k, child; i < p; i++) {
+        child = node.children[i];
+        extend(bbox, node.leaf ? toBBox(child) : child.bbox);
+    }
+
+    return bbox;
+}
+
+function empty() { return [Infinity, Infinity, -Infinity, -Infinity]; }
+
+function extend(a, b) {
+    a[0] = Math.min(a[0], b[0]);
+    a[1] = Math.min(a[1], b[1]);
+    a[2] = Math.max(a[2], b[2]);
+    a[3] = Math.max(a[3], b[3]);
+    return a;
+}
+
+function compareNodeMinX(a, b) { return a.bbox[0] - b.bbox[0]; }
+function compareNodeMinY(a, b) { return a.bbox[1] - b.bbox[1]; }
+
+function bboxArea(a)   { return (a[2] - a[0]) * (a[3] - a[1]); }
+function bboxMargin(a) { return (a[2] - a[0]) + (a[3] - a[1]); }
+
+function enlargedArea(a, b) {
+    return (Math.max(b[2], a[2]) - Math.min(b[0], a[0])) *
+           (Math.max(b[3], a[3]) - Math.min(b[1], a[1]));
+}
+
+function intersectionArea(a, b) {
+    var minX = Math.max(a[0], b[0]),
+        minY = Math.max(a[1], b[1]),
+        maxX = Math.min(a[2], b[2]),
+        maxY = Math.min(a[3], b[3]);
+
+    return Math.max(0, maxX - minX) *
+           Math.max(0, maxY - minY);
+}
+
+function contains(a, b) {
+    return a[0] <= b[0] &&
+           a[1] <= b[1] &&
+           b[2] <= a[2] &&
+           b[3] <= a[3];
+}
+
+function intersects(a, b) {
+    return b[0] <= a[2] &&
+           b[1] <= a[3] &&
+           b[2] >= a[0] &&
+           b[3] >= a[1];
+}
+
+// sort an array so that items come in groups of n unsorted items, with groups sorted between each other;
+// combines selection algorithm with binary divide & conquer approach
+
+function multiSelect(arr, left, right, n, compare) {
+    var stack = [left, right],
+        mid;
+
+    while (stack.length) {
+        right = stack.pop();
+        left = stack.pop();
+
+        if (right - left <= n) continue;
+
+        mid = left + Math.ceil((right - left) / n / 2) * n;
+        select(arr, left, right, mid, compare);
+
+        stack.push(left, mid, mid, right);
+    }
+}
+
+// Floyd-Rivest selection algorithm:
+// sort an array between left and right (inclusive) so that the smallest k elements come first (unordered)
+function select(arr, left, right, k, compare) {
+    var n, i, z, s, sd, newLeft, newRight, t, j;
+
+    while (right > left) {
+        if (right - left > 600) {
+            n = right - left + 1;
+            i = k - left + 1;
+            z = Math.log(n);
+            s = 0.5 * Math.exp(2 * z / 3);
+            sd = 0.5 * Math.sqrt(z * s * (n - s) / n) * (i - n / 2 < 0 ? -1 : 1);
+            newLeft = Math.max(left, Math.floor(k - i * s / n + sd));
+            newRight = Math.min(right, Math.floor(k + (n - i) * s / n + sd));
+            select(arr, newLeft, newRight, k, compare);
+        }
+
+        t = arr[k];
+        i = left;
+        j = right;
+
+        swap(arr, left, k);
+        if (compare(arr[right], t) > 0) swap(arr, left, right);
+
+        while (i < j) {
+            swap(arr, i, j);
+            i++;
+            j--;
+            while (compare(arr[i], t) < 0) i++;
+            while (compare(arr[j], t) > 0) j--;
+        }
+
+        if (compare(arr[left], t) === 0) swap(arr, left, j);
+        else {
+            j++;
+            swap(arr, j, right);
+        }
+
+        if (j <= k) left = j + 1;
+        if (k <= j) right = j - 1;
+    }
+}
+
+function swap(arr, i, j) {
+    var tmp = arr[i];
+    arr[i] = arr[j];
+    arr[j] = tmp;
+}
+
+
+// export as AMD/CommonJS module or global variable
+if (typeof define === 'function' && define.amd) define('rbush', function() { return rbush; });
+else if (typeof module !== 'undefined') module.exports = rbush;
+else if (typeof self !== 'undefined') self.rbush = rbush;
+else window.rbush = rbush;
+
+})();
+
+ol.ext.rbush = module.exports;
+})();
+
+goog.provide('ol.structs.RBush');
+
+goog.require('goog.asserts');
+goog.require('goog.object');
+goog.require('ol.ext.rbush');
+goog.require('ol.extent');
+
+
+
+/**
+ * Wrapper around the RBush by Vladimir Agafonkin.
+ *
+ * @constructor
+ * @param {number=} opt_maxEntries Max entries.
+ * @see https://github.com/mourner/rbush
+ * @struct
+ * @template T
+ */
+ol.structs.RBush = function(opt_maxEntries) {
+
+  /**
+   * @private
+   */
+  this.rbush_ = ol.ext.rbush(opt_maxEntries);
+
+  /**
+   * A mapping between the objects added to this rbush wrapper
+   * and the objects that are actually added to the internal rbush.
+   * @private
+   * @type {Object.<number, Object>}
+   */
+  this.items_ = {};
+
+  if (goog.DEBUG) {
+    /**
+     * @private
+     * @type {number}
+     */
+    this.readers_ = 0;
+  }
+};
+
+
+/**
+ * Insert a value into the RBush.
+ * @param {ol.Extent} extent Extent.
+ * @param {T} value Value.
+ */
+ol.structs.RBush.prototype.insert = function(extent, value) {
+  if (goog.DEBUG && this.readers_) {
+    throw new Error('Can not insert value while reading');
+  }
+  var item = [
+    extent[0],
+    extent[1],
+    extent[2],
+    extent[3],
+    value
+  ];
+  this.rbush_.insert(item);
+  // remember the object that was added to the internal rbush
+  goog.asserts.assert(!(goog.getUid(value) in this.items_),
+      'uid (%s) of value (%s) already exists', goog.getUid(value), value);
+  this.items_[goog.getUid(value)] = item;
+};
+
+
+/**
+ * Bulk-insert values into the RBush.
+ * @param {Array.<ol.Extent>} extents Extents.
+ * @param {Array.<T>} values Values.
+ */
+ol.structs.RBush.prototype.load = function(extents, values) {
+  if (goog.DEBUG && this.readers_) {
+    throw new Error('Can not insert values while reading');
+  }
+  goog.asserts.assert(extents.length === values.length,
+      'extens and values must have same length (%s === %s)',
+      extents.length, values.length);
+
+  var items = new Array(values.length);
+  for (var i = 0, l = values.length; i < l; i++) {
+    var extent = extents[i];
+    var value = values[i];
+
+    var item = [
+      extent[0],
+      extent[1],
+      extent[2],
+      extent[3],
+      value
+    ];
+    items[i] = item;
+    goog.asserts.assert(!(goog.getUid(value) in this.items_),
+        'uid (%s) of value (%s) already exists', goog.getUid(value), value);
+    this.items_[goog.getUid(value)] = item;
+  }
+  this.rbush_.load(items);
+};
+
+
+/**
+ * Remove a value from the RBush.
+ * @param {T} value Value.
+ * @return {boolean} Removed.
+ */
+ol.structs.RBush.prototype.remove = function(value) {
+  if (goog.DEBUG && this.readers_) {
+    throw new Error('Can not remove value while reading');
+  }
+  var uid = goog.getUid(value);
+  goog.asserts.assert(uid in this.items_,
+      'uid (%s) of value (%s) does not exist', uid, value);
+
+  // get the object in which the value was wrapped when adding to the
+  // internal rbush. then use that object to do the removal.
+  var item = this.items_[uid];
+  delete this.items_[uid];
+  return this.rbush_.remove(item) !== null;
+};
+
+
+/**
+ * Update the extent of a value in the RBush.
+ * @param {ol.Extent} extent Extent.
+ * @param {T} value Value.
+ */
+ol.structs.RBush.prototype.update = function(extent, value) {
+  var uid = goog.getUid(value);
+  goog.asserts.assert(uid in this.items_,
+      'uid (%s) of value (%s) does not exist', uid, value);
+
+  var item = this.items_[uid];
+  if (!ol.extent.equals(item.slice(0, 4), extent)) {
+    if (goog.DEBUG && this.readers_) {
+      throw new Error('Can not update extent while reading');
+    }
+    this.remove(value);
+    this.insert(extent, value);
+  }
+};
+
+
+/**
+ * Return all values in the RBush.
+ * @return {Array.<T>} All.
+ */
+ol.structs.RBush.prototype.getAll = function() {
+  var items = this.rbush_.all();
+  return items.map(function(item) {
+    return item[4];
+  });
+};
+
+
+/**
+ * Return all values in the given extent.
+ * @param {ol.Extent} extent Extent.
+ * @return {Array.<T>} All in extent.
+ */
+ol.structs.RBush.prototype.getInExtent = function(extent) {
+  var items = this.rbush_.search(extent);
+  return items.map(function(item) {
+    return item[4];
+  });
+};
+
+
+/**
+ * Calls a callback function with each value in the tree.
+ * If the callback returns a truthy value, this value is returned without
+ * checking the rest of the tree.
+ * @param {function(this: S, T): *} callback Callback.
+ * @param {S=} opt_this The object to use as `this` in `callback`.
+ * @return {*} Callback return value.
+ * @template S
+ */
+ol.structs.RBush.prototype.forEach = function(callback, opt_this) {
+  if (goog.DEBUG) {
+    ++this.readers_;
+    try {
+      return this.forEach_(this.getAll(), callback, opt_this);
+    } finally {
+      --this.readers_;
+    }
+  } else {
+    return this.forEach_(this.getAll(), callback, opt_this);
+  }
+};
+
+
+/**
+ * Calls a callback function with each value in the provided extent.
+ * @param {ol.Extent} extent Extent.
+ * @param {function(this: S, T): *} callback Callback.
+ * @param {S=} opt_this The object to use as `this` in `callback`.
+ * @return {*} Callback return value.
+ * @template S
+ */
+ol.structs.RBush.prototype.forEachInExtent =
+    function(extent, callback, opt_this) {
+  if (goog.DEBUG) {
+    ++this.readers_;
+    try {
+      return this.forEach_(this.getInExtent(extent), callback, opt_this);
+    } finally {
+      --this.readers_;
+    }
+  } else {
+    return this.forEach_(this.getInExtent(extent), callback, opt_this);
+  }
+};
+
+
+/**
+ * @param {Array.<T>} values Values.
+ * @param {function(this: S, T): *} callback Callback.
+ * @param {S=} opt_this The object to use as `this` in `callback`.
+ * @private
+ * @return {*} Callback return value.
+ * @template S
+ */
+ol.structs.RBush.prototype.forEach_ = function(values, callback, opt_this) {
+  var result;
+  for (var i = 0, l = values.length; i < l; i++) {
+    result = callback.call(opt_this, values[i]);
+    if (result) {
+      return result;
+    }
+  }
+  return result;
+};
+
+
+/**
+ * @return {boolean} Is empty.
+ */
+ol.structs.RBush.prototype.isEmpty = function() {
+  return goog.object.isEmpty(this.items_);
+};
+
+
+/**
+ * Remove all values from the RBush.
+ */
+ol.structs.RBush.prototype.clear = function() {
+  this.rbush_.clear();
+  this.items_ = {};
+};
+
+
+/**
+ * @param {ol.Extent=} opt_extent Extent.
+ * @return {!ol.Extent} Extent.
+ */
+ol.structs.RBush.prototype.getExtent = function(opt_extent) {
+  // FIXME add getExtent() to rbush
+  return this.rbush_.data.bbox;
+};
+
+// FIXME bulk feature upload - suppress events
+// FIXME make change-detection more refined (notably, geometry hint)
+
+goog.provide('ol.source.Vector');
+goog.provide('ol.source.VectorEvent');
+goog.provide('ol.source.VectorEventType');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.Event');
+goog.require('goog.events.EventType');
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.Collection');
+goog.require('ol.CollectionEventType');
+goog.require('ol.Extent');
+goog.require('ol.Feature');
+goog.require('ol.FeatureLoader');
+goog.require('ol.LoadingStrategy');
+goog.require('ol.ObjectEventType');
+goog.require('ol.extent');
+goog.require('ol.featureloader');
+goog.require('ol.loadingstrategy');
+goog.require('ol.proj');
+goog.require('ol.source.Source');
+goog.require('ol.source.State');
+goog.require('ol.structs.RBush');
+
+
+/**
+ * @enum {string}
+ */
+ol.source.VectorEventType = {
+  /**
+   * Triggered when a feature is added to the source.
+   * @event ol.source.VectorEvent#addfeature
+   * @api stable
+   */
+  ADDFEATURE: 'addfeature',
+
+  /**
+   * Triggered when a feature is updated.
+   * @event ol.source.VectorEvent#changefeature
+   * @api
+   */
+  CHANGEFEATURE: 'changefeature',
+
+  /**
+   * Triggered when the clear method is called on the source.
+   * @event ol.source.VectorEvent#clear
+   * @api
+   */
+  CLEAR: 'clear',
+
+  /**
+   * Triggered when a feature is removed from the source.
+   * See {@link ol.source.Vector#clear source.clear()} for exceptions.
+   * @event ol.source.VectorEvent#removefeature
+   * @api stable
+   */
+  REMOVEFEATURE: 'removefeature'
+};
+
+
+
+/**
+ * @classdesc
+ * Provides a source of features for vector layers. Vector features provided
+ * by this source are suitable for editing. See {@link ol.source.VectorTile} for
+ * vector data that is optimized for rendering.
+ *
+ * @constructor
+ * @extends {ol.source.Source}
+ * @fires ol.source.VectorEvent
+ * @param {olx.source.VectorOptions=} opt_options Vector source options.
+ * @api stable
+ */
+ol.source.Vector = function(opt_options) {
+
+  var options = opt_options || {};
+
+  goog.base(this, {
+    attributions: options.attributions,
+    logo: options.logo,
+    projection: undefined,
+    state: ol.source.State.READY,
+    wrapX: options.wrapX !== undefined ? options.wrapX : true
+  });
+
+  /**
+   * @private
+   * @type {ol.FeatureLoader}
+   */
+  this.loader_ = ol.nullFunction;
+
+  if (options.loader !== undefined) {
+    this.loader_ = options.loader;
+  } else if (options.url !== undefined) {
+    goog.asserts.assert(options.format !== undefined,
+        'format must be set when url is set');
+    // create a XHR feature loader for "url" and "format"
+    this.loader_ = ol.featureloader.xhr(options.url, options.format);
+  }
+
+  /**
+   * @private
+   * @type {ol.LoadingStrategy}
+   */
+  this.strategy_ = options.strategy !== undefined ? options.strategy :
+      ol.loadingstrategy.all;
+
+  var useSpatialIndex =
+      options.useSpatialIndex !== undefined ? options.useSpatialIndex : true;
+
+  /**
+   * @private
+   * @type {ol.structs.RBush.<ol.Feature>}
+   */
+  this.featuresRtree_ = useSpatialIndex ? new ol.structs.RBush() : null;
+
+  /**
+   * @private
+   * @type {ol.structs.RBush.<{extent: ol.Extent}>}
+   */
+  this.loadedExtentsRtree_ = new ol.structs.RBush();
+
+  /**
+   * @private
+   * @type {Object.<string, ol.Feature>}
+   */
+  this.nullGeometryFeatures_ = {};
+
+  /**
+   * A lookup of features by id (the return from feature.getId()).
+   * @private
+   * @type {Object.<string, ol.Feature>}
+   */
+  this.idIndex_ = {};
+
+  /**
+   * A lookup of features without id (keyed by goog.getUid(feature)).
+   * @private
+   * @type {Object.<string, ol.Feature>}
+   */
+  this.undefIdIndex_ = {};
+
+  /**
+   * @private
+   * @type {Object.<string, Array.<goog.events.Key>>}
+   */
+  this.featureChangeKeys_ = {};
+
+  /**
+   * @private
+   * @type {ol.Collection.<ol.Feature>}
+   */
+  this.featuresCollection_ = null;
+
+  var collection, features;
+  if (options.features instanceof ol.Collection) {
+    collection = options.features;
+    features = collection.getArray();
+  } else if (goog.isArray(options.features)) {
+    features = options.features;
+  }
+  if (!useSpatialIndex && collection === undefined) {
+    collection = new ol.Collection(features);
+  }
+  if (features !== undefined) {
+    this.addFeaturesInternal(features);
+  }
+  if (collection !== undefined) {
+    this.bindFeaturesCollection_(collection);
+  }
+
+};
+goog.inherits(ol.source.Vector, ol.source.Source);
+
+
+/**
+ * Add a single feature to the source.  If you want to add a batch of features
+ * at once, call {@link ol.source.Vector#addFeatures source.addFeatures()}
+ * instead.
+ * @param {ol.Feature} feature Feature to add.
+ * @api stable
+ */
+ol.source.Vector.prototype.addFeature = function(feature) {
+  this.addFeatureInternal(feature);
+  this.changed();
+};
+
+
+/**
+ * Add a feature without firing a `change` event.
+ * @param {ol.Feature} feature Feature.
+ * @protected
+ */
+ol.source.Vector.prototype.addFeatureInternal = function(feature) {
+  var featureKey = goog.getUid(feature).toString();
+
+  if (!this.addToIndex_(featureKey, feature)) {
+    return;
+  }
+
+  this.setupChangeEvents_(featureKey, feature);
+
+  var geometry = feature.getGeometry();
+  if (geometry) {
+    var extent = geometry.getExtent();
+    if (this.featuresRtree_) {
+      this.featuresRtree_.insert(extent, feature);
+    }
+  } else {
+    this.nullGeometryFeatures_[featureKey] = feature;
+  }
+
+  this.dispatchEvent(
+      new ol.source.VectorEvent(ol.source.VectorEventType.ADDFEATURE, feature));
+};
+
+
+/**
+ * @param {string} featureKey
+ * @param {ol.Feature} feature
+ * @private
+ */
+ol.source.Vector.prototype.setupChangeEvents_ = function(featureKey, feature) {
+  goog.asserts.assert(!(featureKey in this.featureChangeKeys_),
+      'key (%s) not yet registered in featureChangeKey', featureKey);
+  this.featureChangeKeys_[featureKey] = [
+    goog.events.listen(feature,
+        goog.events.EventType.CHANGE,
+        this.handleFeatureChange_, false, this),
+    goog.events.listen(feature,
+        ol.ObjectEventType.PROPERTYCHANGE,
+        this.handleFeatureChange_, false, this)
+  ];
+};
+
+
+/**
+ * @param {string} featureKey
+ * @param {ol.Feature} feature
+ * @return {boolean} `true` if the feature is "valid", in the sense that it is
+ *     also a candidate for insertion into the Rtree, otherwise `false`.
+ * @private
+ */
+ol.source.Vector.prototype.addToIndex_ = function(featureKey, feature) {
+  var valid = true;
+  var id = feature.getId();
+  if (id !== undefined) {
+    if (!(id.toString() in this.idIndex_)) {
+      this.idIndex_[id.toString()] = feature;
+    } else {
+      valid = false;
+    }
+  } else {
+    goog.asserts.assert(!(featureKey in this.undefIdIndex_),
+        'Feature already added to the source');
+    this.undefIdIndex_[featureKey] = feature;
+  }
+  return valid;
+};
+
+
+/**
+ * Add a batch of features to the source.
+ * @param {Array.<ol.Feature>} features Features to add.
+ * @api stable
+ */
+ol.source.Vector.prototype.addFeatures = function(features) {
+  this.addFeaturesInternal(features);
+  this.changed();
+};
+
+
+/**
+ * Add features without firing a `change` event.
+ * @param {Array.<ol.Feature>} features Features.
+ * @protected
+ */
+ol.source.Vector.prototype.addFeaturesInternal = function(features) {
+  var featureKey, i, length, feature;
+
+  var extents = [];
+  var newFeatures = [];
+  var geometryFeatures = [];
+
+  for (i = 0, length = features.length; i < length; i++) {
+    feature = features[i];
+    featureKey = goog.getUid(feature).toString();
+    if (this.addToIndex_(featureKey, feature)) {
+      newFeatures.push(feature);
+    }
+  }
+
+  for (i = 0, length = newFeatures.length; i < length; i++) {
+    feature = newFeatures[i];
+    featureKey = goog.getUid(feature).toString();
+    this.setupChangeEvents_(featureKey, feature);
+
+    var geometry = feature.getGeometry();
+    if (geometry) {
+      var extent = geometry.getExtent();
+      extents.push(extent);
+      geometryFeatures.push(feature);
+    } else {
+      this.nullGeometryFeatures_[featureKey] = feature;
+    }
+  }
+  if (this.featuresRtree_) {
+    this.featuresRtree_.load(extents, geometryFeatures);
+  }
+
+  for (i = 0, length = newFeatures.length; i < length; i++) {
+    this.dispatchEvent(new ol.source.VectorEvent(
+        ol.source.VectorEventType.ADDFEATURE, newFeatures[i]));
+  }
+};
+
+
+/**
+ * @param {!ol.Collection.<ol.Feature>} collection Collection.
+ * @private
+ */
+ol.source.Vector.prototype.bindFeaturesCollection_ = function(collection) {
+  goog.asserts.assert(!this.featuresCollection_,
+      'bindFeaturesCollection can only be called once');
+  var modifyingCollection = false;
+  goog.events.listen(this, ol.source.VectorEventType.ADDFEATURE,
+      function(evt) {
+        if (!modifyingCollection) {
+          modifyingCollection = true;
+          collection.push(evt.feature);
+          modifyingCollection = false;
+        }
+      });
+  goog.events.listen(this, ol.source.VectorEventType.REMOVEFEATURE,
+      function(evt) {
+        if (!modifyingCollection) {
+          modifyingCollection = true;
+          collection.remove(evt.feature);
+          modifyingCollection = false;
+        }
+      });
+  goog.events.listen(collection, ol.CollectionEventType.ADD,
+      function(evt) {
+        if (!modifyingCollection) {
+          var feature = evt.element;
+          goog.asserts.assertInstanceof(feature, ol.Feature);
+          modifyingCollection = true;
+          this.addFeature(feature);
+          modifyingCollection = false;
+        }
+      }, false, this);
+  goog.events.listen(collection, ol.CollectionEventType.REMOVE,
+      function(evt) {
+        if (!modifyingCollection) {
+          var feature = evt.element;
+          goog.asserts.assertInstanceof(feature, ol.Feature);
+          modifyingCollection = true;
+          this.removeFeature(feature);
+          modifyingCollection = false;
+        }
+      }, false, this);
+  this.featuresCollection_ = collection;
+};
+
+
+/**
+ * Remove all features from the source.
+ * @param {boolean=} opt_fast Skip dispatching of {@link removefeature} events.
+ * @api stable
+ */
+ol.source.Vector.prototype.clear = function(opt_fast) {
+  if (opt_fast) {
+    for (var featureId in this.featureChangeKeys_) {
+      var keys = this.featureChangeKeys_[featureId];
+      keys.forEach(goog.events.unlistenByKey);
+    }
+    if (!this.featuresCollection_) {
+      this.featureChangeKeys_ = {};
+      this.idIndex_ = {};
+      this.undefIdIndex_ = {};
+    }
+  } else {
+    var rmFeatureInternal = this.removeFeatureInternal;
+    if (this.featuresRtree_) {
+      this.featuresRtree_.forEach(rmFeatureInternal, this);
+      goog.object.forEach(this.nullGeometryFeatures_, rmFeatureInternal, this);
+    }
+  }
+  if (this.featuresCollection_) {
+    this.featuresCollection_.clear();
+  }
+  goog.asserts.assert(goog.object.isEmpty(this.featureChangeKeys_),
+      'featureChangeKeys is an empty object now');
+  goog.asserts.assert(goog.object.isEmpty(this.idIndex_),
+      'idIndex is an empty object now');
+  goog.asserts.assert(goog.object.isEmpty(this.undefIdIndex_),
+      'undefIdIndex is an empty object now');
+
+  if (this.featuresRtree_) {
+    this.featuresRtree_.clear();
+  }
+  this.loadedExtentsRtree_.clear();
+  this.nullGeometryFeatures_ = {};
+
+  var clearEvent = new ol.source.VectorEvent(ol.source.VectorEventType.CLEAR);
+  this.dispatchEvent(clearEvent);
+  this.changed();
+};
+
+
+/**
+ * Iterate through all features on the source, calling the provided callback
+ * with each one.  If the callback returns any "truthy" value, iteration will
+ * stop and the function will return the same value.
+ *
+ * @param {function(this: T, ol.Feature): S} callback Called with each feature
+ *     on the source.  Return a truthy value to stop iteration.
+ * @param {T=} opt_this The object to use as `this` in the callback.
+ * @return {S|undefined} The return value from the last call to the callback.
+ * @template T,S
+ * @api stable
+ */
+ol.source.Vector.prototype.forEachFeature = function(callback, opt_this) {
+  if (this.featuresRtree_) {
+    return this.featuresRtree_.forEach(callback, opt_this);
+  } else if (this.featuresCollection_) {
+    return this.featuresCollection_.forEach(callback, opt_this);
+  }
+};
+
+
+/**
+ * Iterate through all features whose geometries contain the provided
+ * coordinate, calling the callback with each feature.  If the callback returns
+ * a "truthy" value, iteration will stop and the function will return the same
+ * value.
+ *
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {function(this: T, ol.Feature): S} callback Called with each feature
+ *     whose goemetry contains the provided coordinate.
+ * @param {T=} opt_this The object to use as `this` in the callback.
+ * @return {S|undefined} The return value from the last call to the callback.
+ * @template T,S
+ */
+ol.source.Vector.prototype.forEachFeatureAtCoordinateDirect =
+    function(coordinate, callback, opt_this) {
+  var extent = [coordinate[0], coordinate[1], coordinate[0], coordinate[1]];
+  return this.forEachFeatureInExtent(extent, function(feature) {
+    var geometry = feature.getGeometry();
+    goog.asserts.assert(geometry, 'feature geometry is defined and not null');
+    if (geometry.containsCoordinate(coordinate)) {
+      return callback.call(opt_this, feature);
+    } else {
+      return undefined;
+    }
+  });
+};
+
+
+/**
+ * Iterate through all features whose bounding box intersects the provided
+ * extent (note that the feature's geometry may not intersect the extent),
+ * calling the callback with each feature.  If the callback returns a "truthy"
+ * value, iteration will stop and the function will return the same value.
+ *
+ * If you are interested in features whose geometry intersects an extent, call
+ * the {@link ol.source.Vector#forEachFeatureIntersectingExtent
+ * source.forEachFeatureIntersectingExtent()} method instead.
+ *
+ * When `useSpatialIndex` is set to false, this method will loop through all
+ * features, equivalent to {@link ol.source.Vector#forEachFeature}.
+ *
+ * @param {ol.Extent} extent Extent.
+ * @param {function(this: T, ol.Feature): S} callback Called with each feature
+ *     whose bounding box intersects the provided extent.
+ * @param {T=} opt_this The object to use as `this` in the callback.
+ * @return {S|undefined} The return value from the last call to the callback.
+ * @template T,S
+ * @api
+ */
+ol.source.Vector.prototype.forEachFeatureInExtent =
+    function(extent, callback, opt_this) {
+  if (this.featuresRtree_) {
+    return this.featuresRtree_.forEachInExtent(extent, callback, opt_this);
+  } else if (this.featuresCollection_) {
+    return this.featuresCollection_.forEach(callback, opt_this);
+  }
+};
+
+
+/**
+ * Iterate through all features whose geometry intersects the provided extent,
+ * calling the callback with each feature.  If the callback returns a "truthy"
+ * value, iteration will stop and the function will return the same value.
+ *
+ * If you only want to test for bounding box intersection, call the
+ * {@link ol.source.Vector#forEachFeatureInExtent
+ * source.forEachFeatureInExtent()} method instead.
+ *
+ * @param {ol.Extent} extent Extent.
+ * @param {function(this: T, ol.Feature): S} callback Called with each feature
+ *     whose geometry intersects the provided extent.
+ * @param {T=} opt_this The object to use as `this` in the callback.
+ * @return {S|undefined} The return value from the last call to the callback.
+ * @template T,S
+ * @api
+ */
+ol.source.Vector.prototype.forEachFeatureIntersectingExtent =
+    function(extent, callback, opt_this) {
+  return this.forEachFeatureInExtent(extent,
+      /**
+       * @param {ol.Feature} feature Feature.
+       * @return {S|undefined}
+       * @template S
+       */
+      function(feature) {
+        var geometry = feature.getGeometry();
+        goog.asserts.assert(geometry,
+            'feature geometry is defined and not null');
+        if (geometry.intersectsExtent(extent)) {
+          var result = callback.call(opt_this, feature);
+          if (result) {
+            return result;
+          }
+        }
+      });
+};
+
+
+/**
+ * Get the features collection associated with this source. Will be `null`
+ * unless the source was configured with `useSpatialIndex` set to `false`, or
+ * with an {@link ol.Collection} as `features`.
+ * @return {ol.Collection.<ol.Feature>}
+ * @api
+ */
+ol.source.Vector.prototype.getFeaturesCollection = function() {
+  return this.featuresCollection_;
+};
+
+
+/**
+ * Get all features on the source.
+ * @return {Array.<ol.Feature>} Features.
+ * @api stable
+ */
+ol.source.Vector.prototype.getFeatures = function() {
+  var features;
+  if (this.featuresCollection_) {
+    features = this.featuresCollection_.getArray();
+  } else if (this.featuresRtree_) {
+    features = this.featuresRtree_.getAll();
+    if (!goog.object.isEmpty(this.nullGeometryFeatures_)) {
+      goog.array.extend(
+          features, goog.object.getValues(this.nullGeometryFeatures_));
+    }
+  }
+  goog.asserts.assert(features !== undefined,
+      'Neither featuresRtree_ nor featuresCollection_ are available');
+  return features;
+};
+
+
+/**
+ * Get all features whose geometry intersects the provided coordinate.
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @return {Array.<ol.Feature>} Features.
+ * @api stable
+ */
+ol.source.Vector.prototype.getFeaturesAtCoordinate = function(coordinate) {
+  var features = [];
+  this.forEachFeatureAtCoordinateDirect(coordinate, function(feature) {
+    features.push(feature);
+  });
+  return features;
+};
+
+
+/**
+ * Get all features in the provided extent.  Note that this returns all features
+ * whose bounding boxes intersect the given extent (so it may include features
+ * whose geometries do not intersect the extent).
+ *
+ * This method is not available when the source is configured with
+ * `useSpatialIndex` set to `false`.
+ * @param {ol.Extent} extent Extent.
+ * @return {Array.<ol.Feature>} Features.
+ * @api
+ */
+ol.source.Vector.prototype.getFeaturesInExtent = function(extent) {
+  goog.asserts.assert(this.featuresRtree_,
+      'getFeaturesInExtent does not work when useSpatialIndex is set to false');
+  return this.featuresRtree_.getInExtent(extent);
+};
+
+
+/**
+ * Get the closest feature to the provided coordinate.
+ *
+ * This method is not available when the source is configured with
+ * `useSpatialIndex` set to `false`.
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @return {ol.Feature} Closest feature.
+ * @api stable
+ */
+ol.source.Vector.prototype.getClosestFeatureToCoordinate =
+    function(coordinate) {
+  // Find the closest feature using branch and bound.  We start searching an
+  // infinite extent, and find the distance from the first feature found.  This
+  // becomes the closest feature.  We then compute a smaller extent which any
+  // closer feature must intersect.  We continue searching with this smaller
+  // extent, trying to find a closer feature.  Every time we find a closer
+  // feature, we update the extent being searched so that any even closer
+  // feature must intersect it.  We continue until we run out of features.
+  var x = coordinate[0];
+  var y = coordinate[1];
+  var closestFeature = null;
+  var closestPoint = [NaN, NaN];
+  var minSquaredDistance = Infinity;
+  var extent = [-Infinity, -Infinity, Infinity, Infinity];
+  goog.asserts.assert(this.featuresRtree_,
+      'getClosestFeatureToCoordinate does not work with useSpatialIndex set ' +
+      'to false');
+  this.featuresRtree_.forEachInExtent(extent,
+      /**
+       * @param {ol.Feature} feature Feature.
+       */
+      function(feature) {
+        var geometry = feature.getGeometry();
+        goog.asserts.assert(geometry,
+            'feature geometry is defined and not null');
+        var previousMinSquaredDistance = minSquaredDistance;
+        minSquaredDistance = geometry.closestPointXY(
+            x, y, closestPoint, minSquaredDistance);
+        if (minSquaredDistance < previousMinSquaredDistance) {
+          closestFeature = feature;
+          // This is sneaky.  Reduce the extent that it is currently being
+          // searched while the R-Tree traversal using this same extent object
+          // is still in progress.  This is safe because the new extent is
+          // strictly contained by the old extent.
+          var minDistance = Math.sqrt(minSquaredDistance);
+          extent[0] = x - minDistance;
+          extent[1] = y - minDistance;
+          extent[2] = x + minDistance;
+          extent[3] = y + minDistance;
+        }
+      });
+  return closestFeature;
+};
+
+
+/**
+ * Get the extent of the features currently in the source.
+ *
+ * This method is not available when the source is configured with
+ * `useSpatialIndex` set to `false`.
+ * @return {!ol.Extent} Extent.
+ * @api stable
+ */
+ol.source.Vector.prototype.getExtent = function() {
+  goog.asserts.assert(this.featuresRtree_,
+      'getExtent does not work when useSpatialIndex is set to false');
+  return this.featuresRtree_.getExtent();
+};
+
+
+/**
+ * Get a feature by its identifier (the value returned by feature.getId()).
+ * Note that the index treats string and numeric identifiers as the same.  So
+ * `source.getFeatureById(2)` will return a feature with id `'2'` or `2`.
+ *
+ * @param {string|number} id Feature identifier.
+ * @return {ol.Feature} The feature (or `null` if not found).
+ * @api stable
+ */
+ol.source.Vector.prototype.getFeatureById = function(id) {
+  var feature = this.idIndex_[id.toString()];
+  return feature !== undefined ? feature : null;
+};
+
+
+/**
+ * @param {goog.events.Event} event Event.
+ * @private
+ */
+ol.source.Vector.prototype.handleFeatureChange_ = function(event) {
+  var feature = /** @type {ol.Feature} */ (event.target);
+  var featureKey = goog.getUid(feature).toString();
+  var geometry = feature.getGeometry();
+  if (!geometry) {
+    if (!(featureKey in this.nullGeometryFeatures_)) {
+      if (this.featuresRtree_) {
+        this.featuresRtree_.remove(feature);
+      }
+      this.nullGeometryFeatures_[featureKey] = feature;
+    }
+  } else {
+    var extent = geometry.getExtent();
+    if (featureKey in this.nullGeometryFeatures_) {
+      delete this.nullGeometryFeatures_[featureKey];
+      if (this.featuresRtree_) {
+        this.featuresRtree_.insert(extent, feature);
+      }
+    } else {
+      if (this.featuresRtree_) {
+        this.featuresRtree_.update(extent, feature);
+      }
+    }
+  }
+  var id = feature.getId();
+  var removed;
+  if (id !== undefined) {
+    var sid = id.toString();
+    if (featureKey in this.undefIdIndex_) {
+      delete this.undefIdIndex_[featureKey];
+      this.idIndex_[sid] = feature;
+    } else {
+      if (this.idIndex_[sid] !== feature) {
+        removed = this.removeFromIdIndex_(feature);
+        goog.asserts.assert(removed,
+            'Expected feature to be removed from index');
+        this.idIndex_[sid] = feature;
+      }
+    }
+  } else {
+    if (!(featureKey in this.undefIdIndex_)) {
+      removed = this.removeFromIdIndex_(feature);
+      goog.asserts.assert(removed,
+          'Expected feature to be removed from index');
+      this.undefIdIndex_[featureKey] = feature;
+    } else {
+      goog.asserts.assert(this.undefIdIndex_[featureKey] === feature,
+          'feature keyed under %s in undefIdKeys', featureKey);
+    }
+  }
+  this.changed();
+  this.dispatchEvent(new ol.source.VectorEvent(
+      ol.source.VectorEventType.CHANGEFEATURE, feature));
+};
+
+
+/**
+ * @return {boolean} Is empty.
+ */
+ol.source.Vector.prototype.isEmpty = function() {
+  return this.featuresRtree_.isEmpty() &&
+      goog.object.isEmpty(this.nullGeometryFeatures_);
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {number} resolution Resolution.
+ * @param {ol.proj.Projection} projection Projection.
+ */
+ol.source.Vector.prototype.loadFeatures = function(
+    extent, resolution, projection) {
+  var loadedExtentsRtree = this.loadedExtentsRtree_;
+  var extentsToLoad = this.strategy_(extent, resolution);
+  var i, ii;
+  for (i = 0, ii = extentsToLoad.length; i < ii; ++i) {
+    var extentToLoad = extentsToLoad[i];
+    var alreadyLoaded = loadedExtentsRtree.forEachInExtent(extentToLoad,
+        /**
+         * @param {{extent: ol.Extent}} object Object.
+         * @return {boolean} Contains.
+         */
+        function(object) {
+          return ol.extent.containsExtent(object.extent, extentToLoad);
+        });
+    if (!alreadyLoaded) {
+      this.loader_.call(this, extentToLoad, resolution, projection);
+      loadedExtentsRtree.insert(extentToLoad, {extent: extentToLoad.slice()});
+    }
+  }
+};
+
+
+/**
+ * Remove a single feature from the source.  If you want to remove all features
+ * at once, use the {@link ol.source.Vector#clear source.clear()} method
+ * instead.
+ * @param {ol.Feature} feature Feature to remove.
+ * @api stable
+ */
+ol.source.Vector.prototype.removeFeature = function(feature) {
+  var featureKey = goog.getUid(feature).toString();
+  if (featureKey in this.nullGeometryFeatures_) {
+    delete this.nullGeometryFeatures_[featureKey];
+  } else {
+    if (this.featuresRtree_) {
+      this.featuresRtree_.remove(feature);
+    }
+  }
+  this.removeFeatureInternal(feature);
+  this.changed();
+};
+
+
+/**
+ * Remove feature without firing a `change` event.
+ * @param {ol.Feature} feature Feature.
+ * @protected
+ */
+ol.source.Vector.prototype.removeFeatureInternal = function(feature) {
+  var featureKey = goog.getUid(feature).toString();
+  goog.asserts.assert(featureKey in this.featureChangeKeys_,
+      'featureKey exists in featureChangeKeys');
+  this.featureChangeKeys_[featureKey].forEach(goog.events.unlistenByKey);
+  delete this.featureChangeKeys_[featureKey];
+  var id = feature.getId();
+  if (id !== undefined) {
+    delete this.idIndex_[id.toString()];
+  } else {
+    delete this.undefIdIndex_[featureKey];
+  }
+  this.dispatchEvent(new ol.source.VectorEvent(
+      ol.source.VectorEventType.REMOVEFEATURE, feature));
+};
+
+
+/**
+ * Remove a feature from the id index.  Called internally when the feature id
+ * may have changed.
+ * @param {ol.Feature} feature The feature.
+ * @return {boolean} Removed the feature from the index.
+ * @private
+ */
+ol.source.Vector.prototype.removeFromIdIndex_ = function(feature) {
+  var removed = false;
+  for (var id in this.idIndex_) {
+    if (this.idIndex_[id] === feature) {
+      delete this.idIndex_[id];
+      removed = true;
+      break;
+    }
+  }
+  return removed;
+};
+
+
+
+/**
+ * @classdesc
+ * Events emitted by {@link ol.source.Vector} instances are instances of this
+ * type.
+ *
+ * @constructor
+ * @extends {goog.events.Event}
+ * @implements {oli.source.VectorEvent}
+ * @param {string} type Type.
+ * @param {ol.Feature=} opt_feature Feature.
+ */
+ol.source.VectorEvent = function(type, opt_feature) {
+
+  goog.base(this, type);
+
+  /**
+   * The feature being added or removed.
+   * @type {ol.Feature|undefined}
+   * @api stable
+   */
+  this.feature = opt_feature;
+
+};
+goog.inherits(ol.source.VectorEvent, goog.events.Event);
+
+goog.provide('ol.source.ImageVector');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('goog.vec.Mat4');
+goog.require('ol.dom');
+goog.require('ol.extent');
+goog.require('ol.render.canvas.ReplayGroup');
+goog.require('ol.renderer.vector');
+goog.require('ol.source.ImageCanvas');
+goog.require('ol.source.Vector');
+goog.require('ol.style.Style');
+goog.require('ol.vec.Mat4');
+
+
+
+/**
+ * @classdesc
+ * An image source whose images are canvas elements into which vector features
+ * read from a vector source (`ol.source.Vector`) are drawn. An
+ * `ol.source.ImageVector` object is to be used as the `source` of an image
+ * layer (`ol.layer.Image`). Image layers are rotated, scaled, and translated,
+ * as opposed to being re-rendered, during animations and interactions. So, like
+ * any other image layer, an image layer configured with an
+ * `ol.source.ImageVector` will exhibit this behaviour. This is in contrast to a
+ * vector layer, where vector features are re-drawn during animations and
+ * interactions.
+ *
+ * @constructor
+ * @extends {ol.source.ImageCanvas}
+ * @param {olx.source.ImageVectorOptions} options Options.
+ * @api
+ */
+ol.source.ImageVector = function(options) {
+
+  /**
+   * @private
+   * @type {ol.source.Vector}
+   */
+  this.source_ = options.source;
+
+  /**
+   * @private
+   * @type {!goog.vec.Mat4.Number}
+   */
+  this.transform_ = goog.vec.Mat4.createNumber();
+
+  /**
+   * @private
+   * @type {CanvasRenderingContext2D}
+   */
+  this.canvasContext_ = ol.dom.createCanvasContext2D();
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.canvasSize_ = [0, 0];
+
+  /**
+   * @private
+   * @type {ol.render.canvas.ReplayGroup}
+   */
+  this.replayGroup_ = null;
+
+  goog.base(this, {
+    attributions: options.attributions,
+    canvasFunction: goog.bind(this.canvasFunctionInternal_, this),
+    logo: options.logo,
+    projection: options.projection,
+    ratio: options.ratio,
+    resolutions: options.resolutions,
+    state: this.source_.getState()
+  });
+
+  /**
+   * User provided style.
+   * @type {ol.style.Style|Array.<ol.style.Style>|ol.style.StyleFunction}
+   * @private
+   */
+  this.style_ = null;
+
+  /**
+   * Style function for use within the library.
+   * @type {ol.style.StyleFunction|undefined}
+   * @private
+   */
+  this.styleFunction_ = undefined;
+
+  this.setStyle(options.style);
+
+  goog.events.listen(this.source_, goog.events.EventType.CHANGE,
+      this.handleSourceChange_, undefined, this);
+
+};
+goog.inherits(ol.source.ImageVector, ol.source.ImageCanvas);
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {number} resolution Resolution.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.Size} size Size.
+ * @param {ol.proj.Projection} projection Projection;
+ * @return {HTMLCanvasElement} Canvas element.
+ * @private
+ */
+ol.source.ImageVector.prototype.canvasFunctionInternal_ =
+    function(extent, resolution, pixelRatio, size, projection) {
+
+  var replayGroup = new ol.render.canvas.ReplayGroup(
+      ol.renderer.vector.getTolerance(resolution, pixelRatio), extent,
+      resolution);
+
+  this.source_.loadFeatures(extent, resolution, projection);
+
+  var loading = false;
+  this.source_.forEachFeatureInExtent(extent,
+      /**
+       * @param {ol.Feature} feature Feature.
+       */
+      function(feature) {
+        loading = loading ||
+            this.renderFeature_(feature, resolution, pixelRatio, replayGroup);
+      }, this);
+  replayGroup.finish();
+
+  if (loading) {
+    return null;
+  }
+
+  if (this.canvasSize_[0] != size[0] || this.canvasSize_[1] != size[1]) {
+    this.canvasContext_.canvas.width = size[0];
+    this.canvasContext_.canvas.height = size[1];
+    this.canvasSize_[0] = size[0];
+    this.canvasSize_[1] = size[1];
+  } else {
+    this.canvasContext_.clearRect(0, 0, size[0], size[1]);
+  }
+
+  var transform = this.getTransform_(ol.extent.getCenter(extent),
+      resolution, pixelRatio, size);
+  replayGroup.replay(this.canvasContext_, pixelRatio, transform, 0, {});
+
+  this.replayGroup_ = replayGroup;
+
+  return this.canvasContext_.canvas;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.ImageVector.prototype.forEachFeatureAtCoordinate = function(
+    coordinate, resolution, rotation, skippedFeatureUids, callback) {
+  if (!this.replayGroup_) {
+    return undefined;
+  } else {
+    /** @type {Object.<string, boolean>} */
+    var features = {};
+    return this.replayGroup_.forEachFeatureAtCoordinate(
+        coordinate, resolution, 0, skippedFeatureUids,
+        /**
+         * @param {ol.Feature|ol.render.Feature} feature Feature.
+         * @return {?} Callback result.
+         */
+        function(feature) {
+          goog.asserts.assert(feature !== undefined, 'passed a feature');
+          var key = goog.getUid(feature).toString();
+          if (!(key in features)) {
+            features[key] = true;
+            return callback(feature);
+          }
+        });
+  }
+};
+
+
+/**
+ * Get a reference to the wrapped source.
+ * @return {ol.source.Vector} Source.
+ * @api
+ */
+ol.source.ImageVector.prototype.getSource = function() {
+  return this.source_;
+};
+
+
+/**
+ * Get the style for features.  This returns whatever was passed to the `style`
+ * option at construction or to the `setStyle` method.
+ * @return {ol.style.Style|Array.<ol.style.Style>|ol.style.StyleFunction}
+ *     Layer style.
+ * @api stable
+ */
+ol.source.ImageVector.prototype.getStyle = function() {
+  return this.style_;
+};
+
+
+/**
+ * Get the style function.
+ * @return {ol.style.StyleFunction|undefined} Layer style function.
+ * @api stable
+ */
+ol.source.ImageVector.prototype.getStyleFunction = function() {
+  return this.styleFunction_;
+};
+
+
+/**
+ * @param {ol.Coordinate} center Center.
+ * @param {number} resolution Resolution.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.Size} size Size.
+ * @return {!goog.vec.Mat4.Number} Transform.
+ * @private
+ */
+ol.source.ImageVector.prototype.getTransform_ =
+    function(center, resolution, pixelRatio, size) {
+  return ol.vec.Mat4.makeTransform2D(this.transform_,
+      size[0] / 2, size[1] / 2,
+      pixelRatio / resolution, -pixelRatio / resolution,
+      0,
+      -center[0], -center[1]);
+};
+
+
+/**
+ * Handle changes in image style state.
+ * @param {goog.events.Event} event Image style change event.
+ * @private
+ */
+ol.source.ImageVector.prototype.handleImageChange_ =
+    function(event) {
+  this.changed();
+};
+
+
+/**
+ * @private
+ */
+ol.source.ImageVector.prototype.handleSourceChange_ = function() {
+  // setState will trigger a CHANGE event, so we always rely
+  // change events by calling setState.
+  this.setState(this.source_.getState());
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature.
+ * @param {number} resolution Resolution.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.render.canvas.ReplayGroup} replayGroup Replay group.
+ * @return {boolean} `true` if an image is loading.
+ * @private
+ */
+ol.source.ImageVector.prototype.renderFeature_ =
+    function(feature, resolution, pixelRatio, replayGroup) {
+  var styles;
+  var styleFunction = feature.getStyleFunction();
+  if (styleFunction) {
+    styles = styleFunction.call(feature, resolution);
+  } else if (this.styleFunction_) {
+    styles = this.styleFunction_(feature, resolution);
+  }
+  if (!styles) {
+    return false;
+  }
+  var i, ii, loading = false;
+  for (i = 0, ii = styles.length; i < ii; ++i) {
+    loading = ol.renderer.vector.renderFeature(
+        replayGroup, feature, styles[i],
+        ol.renderer.vector.getSquaredTolerance(resolution, pixelRatio),
+        this.handleImageChange_, this) || loading;
+  }
+  return loading;
+};
+
+
+/**
+ * Set the style for features.  This can be a single style object, an array
+ * of styles, or a function that takes a feature and resolution and returns
+ * an array of styles. If it is `undefined` the default style is used. If
+ * it is `null` the layer has no style (a `null` style), so only features
+ * that have their own styles will be rendered in the layer. See
+ * {@link ol.style} for information on the default style.
+ * @param {ol.style.Style|Array.<ol.style.Style>|ol.style.StyleFunction|undefined}
+ *     style Layer style.
+ * @api stable
+ */
+ol.source.ImageVector.prototype.setStyle = function(style) {
+  this.style_ = style !== undefined ? style : ol.style.defaultStyleFunction;
+  this.styleFunction_ = !style ?
+      undefined : ol.style.createStyleFunction(this.style_);
+  this.changed();
+};
+
+goog.provide('ol.renderer.canvas.ImageLayer');
+
+goog.require('goog.asserts');
+goog.require('goog.functions');
+goog.require('goog.vec.Mat4');
+goog.require('ol.ImageBase');
+goog.require('ol.ViewHint');
+goog.require('ol.dom');
+goog.require('ol.extent');
+goog.require('ol.layer.Image');
+goog.require('ol.proj');
+goog.require('ol.renderer.canvas.Layer');
+goog.require('ol.source.ImageVector');
+goog.require('ol.vec.Mat4');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.renderer.canvas.Layer}
+ * @param {ol.layer.Image} imageLayer Single image layer.
+ */
+ol.renderer.canvas.ImageLayer = function(imageLayer) {
+
+  goog.base(this, imageLayer);
+
+  /**
+   * @private
+   * @type {?ol.ImageBase}
+   */
+  this.image_ = null;
+
+  /**
+   * @private
+   * @type {!goog.vec.Mat4.Number}
+   */
+  this.imageTransform_ = goog.vec.Mat4.createNumber();
+
+  /**
+   * @private
+   * @type {?goog.vec.Mat4.Number}
+   */
+  this.imageTransformInv_ = null;
+
+  /**
+   * @private
+   * @type {CanvasRenderingContext2D}
+   */
+  this.hitCanvasContext_ = null;
+
+};
+goog.inherits(ol.renderer.canvas.ImageLayer, ol.renderer.canvas.Layer);
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.ImageLayer.prototype.forEachFeatureAtCoordinate =
+    function(coordinate, frameState, callback, thisArg) {
+  var layer = this.getLayer();
+  var source = layer.getSource();
+  var resolution = frameState.viewState.resolution;
+  var rotation = frameState.viewState.rotation;
+  var skippedFeatureUids = frameState.skippedFeatureUids;
+  return source.forEachFeatureAtCoordinate(
+      coordinate, resolution, rotation, skippedFeatureUids,
+      /**
+       * @param {ol.Feature|ol.render.Feature} feature Feature.
+       * @return {?} Callback result.
+       */
+      function(feature) {
+        return callback.call(thisArg, feature, layer);
+      });
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.ImageLayer.prototype.forEachLayerAtPixel =
+    function(pixel, frameState, callback, thisArg) {
+  if (!this.getImage()) {
+    return undefined;
+  }
+
+  if (this.getLayer().getSource() instanceof ol.source.ImageVector) {
+    // for ImageVector sources use the original hit-detection logic,
+    // so that for example also transparent polygons are detected
+    var coordinate = pixel.slice();
+    ol.vec.Mat4.multVec2(
+        frameState.pixelToCoordinateMatrix, coordinate, coordinate);
+    var hasFeature = this.forEachFeatureAtCoordinate(
+        coordinate, frameState, goog.functions.TRUE, this);
+
+    if (hasFeature) {
+      return callback.call(thisArg, this.getLayer());
+    } else {
+      return undefined;
+    }
+  } else {
+    // for all other image sources directly check the image
+    if (!this.imageTransformInv_) {
+      this.imageTransformInv_ = goog.vec.Mat4.createNumber();
+      goog.vec.Mat4.invert(this.imageTransform_, this.imageTransformInv_);
+    }
+
+    var pixelOnCanvas =
+        this.getPixelOnCanvas(pixel, this.imageTransformInv_);
+
+    if (!this.hitCanvasContext_) {
+      this.hitCanvasContext_ = ol.dom.createCanvasContext2D(1, 1);
+    }
+
+    this.hitCanvasContext_.clearRect(0, 0, 1, 1);
+    this.hitCanvasContext_.drawImage(
+        this.getImage(), pixelOnCanvas[0], pixelOnCanvas[1], 1, 1, 0, 0, 1, 1);
+
+    var imageData = this.hitCanvasContext_.getImageData(0, 0, 1, 1).data;
+    if (imageData[3] > 0) {
+      return callback.call(thisArg, this.getLayer());
+    } else {
+      return undefined;
+    }
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.ImageLayer.prototype.getImage = function() {
+  return !this.image_ ? null : this.image_.getImage();
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.ImageLayer.prototype.getImageTransform = function() {
+  return this.imageTransform_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.ImageLayer.prototype.prepareFrame =
+    function(frameState, layerState) {
+
+  var pixelRatio = frameState.pixelRatio;
+  var viewState = frameState.viewState;
+  var viewCenter = viewState.center;
+  var viewResolution = viewState.resolution;
+  var viewRotation = viewState.rotation;
+
+  var image;
+  var imageLayer = this.getLayer();
+  goog.asserts.assertInstanceof(imageLayer, ol.layer.Image,
+      'layer is an instance of ol.layer.Image');
+  var imageSource = imageLayer.getSource();
+
+  var hints = frameState.viewHints;
+
+  var renderedExtent = frameState.extent;
+  if (layerState.extent !== undefined) {
+    renderedExtent = ol.extent.getIntersection(
+        renderedExtent, layerState.extent);
+  }
+
+  if (!hints[ol.ViewHint.ANIMATING] && !hints[ol.ViewHint.INTERACTING] &&
+      !ol.extent.isEmpty(renderedExtent)) {
+    var projection = viewState.projection;
+    if (!ol.ENABLE_RASTER_REPROJECTION) {
+      var sourceProjection = imageSource.getProjection();
+      if (sourceProjection) {
+        goog.asserts.assert(ol.proj.equivalent(projection, sourceProjection),
+            'projection and sourceProjection are equivalent');
+        projection = sourceProjection;
+      }
+    }
+    image = imageSource.getImage(
+        renderedExtent, viewResolution, pixelRatio, projection);
+    if (image) {
+      var loaded = this.loadImage(image);
+      if (loaded) {
+        this.image_ = image;
+      }
+    }
+  }
+
+  if (this.image_) {
+    image = this.image_;
+    var imageExtent = image.getExtent();
+    var imageResolution = image.getResolution();
+    var imagePixelRatio = image.getPixelRatio();
+    var scale = pixelRatio * imageResolution /
+        (viewResolution * imagePixelRatio);
+    ol.vec.Mat4.makeTransform2D(this.imageTransform_,
+        pixelRatio * frameState.size[0] / 2,
+        pixelRatio * frameState.size[1] / 2,
+        scale, scale,
+        viewRotation,
+        imagePixelRatio * (imageExtent[0] - viewCenter[0]) / imageResolution,
+        imagePixelRatio * (viewCenter[1] - imageExtent[3]) / imageResolution);
+    this.imageTransformInv_ = null;
+    this.updateAttributions(frameState.attributions, image.getAttributions());
+    this.updateLogos(frameState, imageSource);
+  }
+
+  return true;
+};
+
+// FIXME find correct globalCompositeOperation
+// FIXME optimize :-)
+
+goog.provide('ol.renderer.canvas.TileLayer');
+
+goog.require('goog.asserts');
+goog.require('goog.vec.Mat4');
+goog.require('ol.Size');
+goog.require('ol.TileRange');
+goog.require('ol.TileState');
+goog.require('ol.array');
+goog.require('ol.dom');
+goog.require('ol.extent');
+goog.require('ol.layer.Tile');
+goog.require('ol.renderer.canvas.Layer');
+goog.require('ol.size');
+goog.require('ol.tilecoord');
+goog.require('ol.vec.Mat4');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.renderer.canvas.Layer}
+ * @param {ol.layer.Tile} tileLayer Tile layer.
+ */
+ol.renderer.canvas.TileLayer = function(tileLayer) {
+
+  goog.base(this, tileLayer);
+
+  /**
+   * @private
+   * @type {HTMLCanvasElement}
+   */
+  this.canvas_ = null;
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.canvasSize_ = null;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.canvasTooBig_ = false;
+
+  /**
+   * @private
+   * @type {CanvasRenderingContext2D}
+   */
+  this.context_ = null;
+
+  /**
+   * @private
+   * @type {!goog.vec.Mat4.Number}
+   */
+  this.imageTransform_ = goog.vec.Mat4.createNumber();
+
+  /**
+   * @private
+   * @type {?goog.vec.Mat4.Number}
+   */
+  this.imageTransformInv_ = null;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.renderedCanvasZ_ = NaN;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.renderedTileWidth_ = NaN;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.renderedTileHeight_ = NaN;
+
+  /**
+   * @private
+   * @type {ol.TileRange}
+   */
+  this.renderedCanvasTileRange_ = null;
+
+  /**
+   * @private
+   * @type {Array.<ol.Tile|undefined>}
+   */
+  this.renderedTiles_ = null;
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.tmpSize_ = [0, 0];
+
+};
+goog.inherits(ol.renderer.canvas.TileLayer, ol.renderer.canvas.Layer);
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.TileLayer.prototype.getImage = function() {
+  return this.canvas_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.TileLayer.prototype.getImageTransform = function() {
+  return this.imageTransform_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.TileLayer.prototype.prepareFrame =
+    function(frameState, layerState) {
+
+  //
+  // Warning! You're entering a dangerous zone!
+  //
+  // The canvas tile layer renderering is highly optimized, hence
+  // the complexity of this function. For best performance we try
+  // to minimize the number of pixels to update on the canvas. This
+  // includes:
+  //
+  // - Only drawing pixels that will be visible.
+  // - Not re-drawing pixels/tiles that are already correct.
+  // - Minimizing calls to clearRect.
+  // - Never shrink the canvas. Just make it bigger when necessary.
+  //   Re-sizing the canvas also clears it, which further means
+  //   re-creating it (expensive).
+  //
+  // The various steps performed by this functions:
+  //
+  // - Create a canvas element if none has been created yet.
+  //
+  // - Make the canvas bigger if it's too small. Note that we never shrink
+  //   the canvas, we just make it bigger when necessary, when rotating for
+  //   example. Note also that the canvas always contains a whole number
+  //   of tiles.
+  //
+  // - Invalidate the canvas tile range (renderedCanvasTileRange_ = null)
+  //   if (1) the canvas has been enlarged, or (2) the zoom level changes,
+  //   or (3) the canvas tile range doesn't contain the required tile
+  //   range. This canvas tile range invalidation thing is related to
+  //   an optimization where we attempt to redraw as few pixels as
+  //   possible on each prepareFrame call.
+  //
+  // - If the canvas tile range has been invalidated we reset
+  //   renderedCanvasTileRange_ and reset the renderedTiles_ array.
+  //   The renderedTiles_ array is the structure used to determine
+  //   the canvas pixels that need not be redrawn from one prepareFrame
+  //   call to another. It records while tile has been rendered at
+  //   which position in the canvas.
+  //
+  // - We then determine the tiles to draw on the canvas. Tiles for
+  //   the target resolution may not be loaded yet. In that case we
+  //   use low-resolution/interim tiles if loaded already. And, if
+  //   for a non-yet-loaded tile we haven't found a corresponding
+  //   low-resolution tile we indicate that the pixels for that
+  //   tile must be cleared on the canvas. Note: determining the
+  //   interim tiles is based on tile extents instead of tile
+  //   coords, this is to be able to handler irregular tile grids.
+  //
+  // - We're now ready to render. We start by calling clearRect
+  //   for the tiles that aren't loaded yet and are not fully covered
+  //   by a low-resolution tile (if they're loaded, we'll draw them;
+  //   if they're fully covered by a low-resolution tile then there's
+  //   no need to clear). We then render the tiles "back to front",
+  //   i.e. starting with the low-resolution tiles.
+  //
+  // - After rendering some bookkeeping is performed (updateUsedTiles,
+  //   etc.). manageTilePyramid is what enqueue tiles in the tile
+  //   queue for loading.
+  //
+  // - The last step involves updating the image transform matrix,
+  //   which will be used by the map renderer for the final
+  //   composition and positioning.
+  //
+
+  var pixelRatio = frameState.pixelRatio;
+  var viewState = frameState.viewState;
+  var projection = viewState.projection;
+
+  var tileLayer = this.getLayer();
+  goog.asserts.assertInstanceof(tileLayer, ol.layer.Tile,
+      'layer is an instance of ol.layer.Tile');
+  var tileSource = tileLayer.getSource();
+  var tileGrid = tileSource.getTileGridForProjection(projection);
+  var tileGutter = tileSource.getGutter();
+  var z = tileGrid.getZForResolution(viewState.resolution);
+  var tilePixelSize =
+      tileSource.getTilePixelSize(z, frameState.pixelRatio, projection);
+  var tilePixelRatio = tilePixelSize[0] /
+      ol.size.toSize(tileGrid.getTileSize(z), this.tmpSize_)[0];
+  var tileResolution = tileGrid.getResolution(z);
+  var tilePixelResolution = tileResolution / tilePixelRatio;
+  var center = viewState.center;
+  var extent;
+  if (tileResolution == viewState.resolution) {
+    center = this.snapCenterToPixel(center, tileResolution, frameState.size);
+    extent = ol.extent.getForViewAndSize(
+        center, tileResolution, viewState.rotation, frameState.size);
+  } else {
+    extent = frameState.extent;
+  }
+
+  if (layerState.extent !== undefined) {
+    extent = ol.extent.getIntersection(extent, layerState.extent);
+  }
+  if (ol.extent.isEmpty(extent)) {
+    // Return false to prevent the rendering of the layer.
+    return false;
+  }
+
+  var tileRange = tileGrid.getTileRangeForExtentAndResolution(
+      extent, tileResolution);
+
+  var canvasWidth = tilePixelSize[0] * tileRange.getWidth();
+  var canvasHeight = tilePixelSize[1] * tileRange.getHeight();
+
+  var canvas, context;
+  if (!this.canvas_) {
+    goog.asserts.assert(!this.canvasSize_,
+        'canvasSize is null (because canvas is null)');
+    goog.asserts.assert(!this.context_,
+        'context is null (because canvas is null)');
+    goog.asserts.assert(!this.renderedCanvasTileRange_,
+        'renderedCanvasTileRange is null (because canvas is null)');
+    context = ol.dom.createCanvasContext2D(canvasWidth, canvasHeight);
+    this.canvas_ = context.canvas;
+    this.canvasSize_ = [canvasWidth, canvasHeight];
+    this.context_ = context;
+    this.canvasTooBig_ =
+        !ol.renderer.canvas.Layer.testCanvasSize(this.canvasSize_);
+  } else {
+    goog.asserts.assert(this.canvasSize_,
+        'non-null canvasSize (because canvas is not null)');
+    goog.asserts.assert(this.context_,
+        'non-null context (because canvas is not null)');
+    canvas = this.canvas_;
+    context = this.context_;
+    if (this.canvasSize_[0] < canvasWidth ||
+        this.canvasSize_[1] < canvasHeight ||
+        this.renderedTileWidth_ !== tilePixelSize[0] ||
+        this.renderedTileHeight_ !== tilePixelSize[1] ||
+        (this.canvasTooBig_ && (this.canvasSize_[0] > canvasWidth ||
+        this.canvasSize_[1] > canvasHeight))) {
+      // Canvas is too small or tileSize has changed, resize it.
+      // We never shrink the canvas, unless
+      // we know that the current canvas size exceeds the maximum size
+      canvas.width = canvasWidth;
+      canvas.height = canvasHeight;
+      this.canvasSize_ = [canvasWidth, canvasHeight];
+      this.canvasTooBig_ =
+          !ol.renderer.canvas.Layer.testCanvasSize(this.canvasSize_);
+      this.renderedCanvasTileRange_ = null;
+    } else {
+      canvasWidth = this.canvasSize_[0];
+      canvasHeight = this.canvasSize_[1];
+      if (z != this.renderedCanvasZ_ ||
+          !this.renderedCanvasTileRange_.containsTileRange(tileRange)) {
+        this.renderedCanvasTileRange_ = null;
+      }
+    }
+  }
+
+  var canvasTileRange, canvasTileRangeWidth, minX, minY;
+  if (!this.renderedCanvasTileRange_) {
+    canvasTileRangeWidth = canvasWidth / tilePixelSize[0];
+    var canvasTileRangeHeight = canvasHeight / tilePixelSize[1];
+    minX = tileRange.minX -
+        Math.floor((canvasTileRangeWidth - tileRange.getWidth()) / 2);
+    minY = tileRange.minY -
+        Math.floor((canvasTileRangeHeight - tileRange.getHeight()) / 2);
+    this.renderedCanvasZ_ = z;
+    this.renderedTileWidth_ = tilePixelSize[0];
+    this.renderedTileHeight_ = tilePixelSize[1];
+    this.renderedCanvasTileRange_ = new ol.TileRange(
+        minX, minX + canvasTileRangeWidth - 1,
+        minY, minY + canvasTileRangeHeight - 1);
+    this.renderedTiles_ =
+        new Array(canvasTileRangeWidth * canvasTileRangeHeight);
+    canvasTileRange = this.renderedCanvasTileRange_;
+  } else {
+    canvasTileRange = this.renderedCanvasTileRange_;
+    canvasTileRangeWidth = canvasTileRange.getWidth();
+  }
+
+  goog.asserts.assert(canvasTileRange.containsTileRange(tileRange),
+      'tileRange is contained in canvasTileRange');
+
+  /**
+   * @type {Object.<number, Object.<string, ol.Tile>>}
+   */
+  var tilesToDrawByZ = {};
+  tilesToDrawByZ[z] = {};
+  /** @type {Array.<ol.Tile>} */
+  var tilesToClear = [];
+
+  var findLoadedTiles = this.createLoadedTileFinder(
+      tileSource, projection, tilesToDrawByZ);
+
+  var useInterimTilesOnError = tileLayer.getUseInterimTilesOnError();
+
+  var tmpExtent = ol.extent.createEmpty();
+  var tmpTileRange = new ol.TileRange(0, 0, 0, 0);
+  var childTileRange, fullyLoaded, tile, x, y;
+  var drawableTile = (
+      /**
+       * @param {!ol.Tile} tile Tile.
+       * @return {boolean} Tile is selected.
+       */
+      function(tile) {
+        var tileState = tile.getState();
+        return tileState == ol.TileState.LOADED ||
+            tileState == ol.TileState.EMPTY ||
+            tileState == ol.TileState.ERROR && !useInterimTilesOnError;
+      });
+  for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
+    for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
+      tile = tileSource.getTile(z, x, y, pixelRatio, projection);
+      if (!drawableTile(tile) && tile.interimTile) {
+        tile = tile.interimTile;
+      }
+      goog.asserts.assert(tile);
+      if (drawableTile(tile)) {
+        tilesToDrawByZ[z][ol.tilecoord.toString(tile.tileCoord)] = tile;
+        continue;
+      }
+      fullyLoaded = tileGrid.forEachTileCoordParentTileRange(
+          tile.tileCoord, findLoadedTiles, null, tmpTileRange, tmpExtent);
+      if (!fullyLoaded) {
+        // FIXME we do not need to clear the tile if it is fully covered by its
+        //       children
+        tilesToClear.push(tile);
+        childTileRange = tileGrid.getTileCoordChildTileRange(
+            tile.tileCoord, tmpTileRange, tmpExtent);
+        if (childTileRange) {
+          findLoadedTiles(z + 1, childTileRange);
+        }
+      }
+
+    }
+  }
+
+  var i, ii;
+  for (i = 0, ii = tilesToClear.length; i < ii; ++i) {
+    tile = tilesToClear[i];
+    x = tilePixelSize[0] * (tile.tileCoord[1] - canvasTileRange.minX);
+    y = tilePixelSize[1] * (canvasTileRange.maxY - tile.tileCoord[2]);
+    context.clearRect(x, y, tilePixelSize[0], tilePixelSize[1]);
+  }
+
+  /** @type {Array.<number>} */
+  var zs = Object.keys(tilesToDrawByZ).map(Number);
+  zs.sort(ol.array.numberSafeCompareFunction);
+  var opaque = tileSource.getOpaque();
+  var origin = ol.extent.getTopLeft(tileGrid.getTileCoordExtent(
+      [z, canvasTileRange.minX, canvasTileRange.maxY],
+      tmpExtent));
+  var currentZ, index, scale, tileCoordKey, tileExtent, tileState, tilesToDraw;
+  var ix, iy, interimTileRange, maxX, maxY;
+  var height, width;
+  for (i = 0, ii = zs.length; i < ii; ++i) {
+    currentZ = zs[i];
+    tilePixelSize =
+        tileSource.getTilePixelSize(currentZ, pixelRatio, projection);
+    tilesToDraw = tilesToDrawByZ[currentZ];
+    if (currentZ == z) {
+      for (tileCoordKey in tilesToDraw) {
+        tile = tilesToDraw[tileCoordKey];
+        index =
+            (tile.tileCoord[2] - canvasTileRange.minY) * canvasTileRangeWidth +
+            (tile.tileCoord[1] - canvasTileRange.minX);
+        if (this.renderedTiles_[index] != tile) {
+          x = tilePixelSize[0] * (tile.tileCoord[1] - canvasTileRange.minX);
+          y = tilePixelSize[1] * (canvasTileRange.maxY - tile.tileCoord[2]);
+          tileState = tile.getState();
+          if (tileState == ol.TileState.EMPTY ||
+              (tileState == ol.TileState.ERROR && !useInterimTilesOnError) ||
+              !opaque) {
+            context.clearRect(x, y, tilePixelSize[0], tilePixelSize[1]);
+          }
+          if (tileState == ol.TileState.LOADED) {
+            context.drawImage(tile.getImage(),
+                tileGutter, tileGutter, tilePixelSize[0], tilePixelSize[1],
+                x, y, tilePixelSize[0], tilePixelSize[1]);
+          }
+          this.renderedTiles_[index] = tile;
+        }
+      }
+    } else {
+      scale = tileGrid.getResolution(currentZ) / tileResolution;
+      for (tileCoordKey in tilesToDraw) {
+        tile = tilesToDraw[tileCoordKey];
+        tileExtent = tileGrid.getTileCoordExtent(tile.tileCoord, tmpExtent);
+        x = (tileExtent[0] - origin[0]) / tilePixelResolution;
+        y = (origin[1] - tileExtent[3]) / tilePixelResolution;
+        width = scale * tilePixelSize[0];
+        height = scale * tilePixelSize[1];
+        tileState = tile.getState();
+        if (tileState == ol.TileState.EMPTY || !opaque) {
+          context.clearRect(x, y, width, height);
+        }
+        if (tileState == ol.TileState.LOADED) {
+          context.drawImage(tile.getImage(),
+              tileGutter, tileGutter, tilePixelSize[0], tilePixelSize[1],
+              x, y, width, height);
+        }
+        interimTileRange =
+            tileGrid.getTileRangeForExtentAndZ(tileExtent, z, tmpTileRange);
+        minX = Math.max(interimTileRange.minX, canvasTileRange.minX);
+        maxX = Math.min(interimTileRange.maxX, canvasTileRange.maxX);
+        minY = Math.max(interimTileRange.minY, canvasTileRange.minY);
+        maxY = Math.min(interimTileRange.maxY, canvasTileRange.maxY);
+        for (ix = minX; ix <= maxX; ++ix) {
+          for (iy = minY; iy <= maxY; ++iy) {
+            index = (iy - canvasTileRange.minY) * canvasTileRangeWidth +
+                    (ix - canvasTileRange.minX);
+            this.renderedTiles_[index] = undefined;
+          }
+        }
+      }
+    }
+  }
+
+  this.updateUsedTiles(frameState.usedTiles, tileSource, z, tileRange);
+  this.manageTilePyramid(frameState, tileSource, tileGrid, pixelRatio,
+      projection, extent, z, tileLayer.getPreload());
+  this.scheduleExpireCache(frameState, tileSource);
+  this.updateLogos(frameState, tileSource);
+
+  ol.vec.Mat4.makeTransform2D(this.imageTransform_,
+      pixelRatio * frameState.size[0] / 2,
+      pixelRatio * frameState.size[1] / 2,
+      pixelRatio * tilePixelResolution / viewState.resolution,
+      pixelRatio * tilePixelResolution / viewState.resolution,
+      viewState.rotation,
+      (origin[0] - center[0]) / tilePixelResolution,
+      (center[1] - origin[1]) / tilePixelResolution);
+  this.imageTransformInv_ = null;
+
+  return true;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.TileLayer.prototype.forEachLayerAtPixel =
+    function(pixel, frameState, callback, thisArg) {
+  if (!this.context_) {
+    return undefined;
+  }
+
+  if (!this.imageTransformInv_) {
+    this.imageTransformInv_ = goog.vec.Mat4.createNumber();
+    goog.vec.Mat4.invert(this.imageTransform_, this.imageTransformInv_);
+  }
+
+  var pixelOnCanvas =
+      this.getPixelOnCanvas(pixel, this.imageTransformInv_);
+
+  var imageData = this.context_.getImageData(
+      pixelOnCanvas[0], pixelOnCanvas[1], 1, 1).data;
+
+  if (imageData[3] > 0) {
+    return callback.call(thisArg, this.getLayer());
+  } else {
+    return undefined;
+  }
+};
+
+goog.provide('ol.renderer.canvas.VectorLayer');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('ol.ViewHint');
+goog.require('ol.dom');
+goog.require('ol.extent');
+goog.require('ol.layer.Vector');
+goog.require('ol.render.EventType');
+goog.require('ol.render.canvas.ReplayGroup');
+goog.require('ol.renderer.canvas.Layer');
+goog.require('ol.renderer.vector');
+goog.require('ol.source.Vector');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.renderer.canvas.Layer}
+ * @param {ol.layer.Vector} vectorLayer Vector layer.
+ */
+ol.renderer.canvas.VectorLayer = function(vectorLayer) {
+
+  goog.base(this, vectorLayer);
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.dirty_ = false;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.renderedRevision_ = -1;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.renderedResolution_ = NaN;
+
+  /**
+   * @private
+   * @type {ol.Extent}
+   */
+  this.renderedExtent_ = ol.extent.createEmpty();
+
+  /**
+   * @private
+   * @type {function(ol.Feature, ol.Feature): number|null}
+   */
+  this.renderedRenderOrder_ = null;
+
+  /**
+   * @private
+   * @type {ol.render.canvas.ReplayGroup}
+   */
+  this.replayGroup_ = null;
+
+  /**
+   * @private
+   * @type {CanvasRenderingContext2D}
+   */
+  this.context_ = ol.dom.createCanvasContext2D();
+
+};
+goog.inherits(ol.renderer.canvas.VectorLayer, ol.renderer.canvas.Layer);
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.VectorLayer.prototype.composeFrame =
+    function(frameState, layerState, context) {
+
+  var extent = frameState.extent;
+  var pixelRatio = frameState.pixelRatio;
+  var skippedFeatureUids = layerState.managed ?
+      frameState.skippedFeatureUids : {};
+  var viewState = frameState.viewState;
+  var projection = viewState.projection;
+  var rotation = viewState.rotation;
+  var projectionExtent = projection.getExtent();
+  var vectorSource = this.getLayer().getSource();
+  goog.asserts.assertInstanceof(vectorSource, ol.source.Vector);
+
+  var transform = this.getTransform(frameState, 0);
+
+  this.dispatchPreComposeEvent(context, frameState, transform);
+
+  var replayGroup = this.replayGroup_;
+  if (replayGroup && !replayGroup.isEmpty()) {
+    var layer = this.getLayer();
+    var replayContext;
+    if (layer.hasListener(ol.render.EventType.RENDER)) {
+      // resize and clear
+      this.context_.canvas.width = context.canvas.width;
+      this.context_.canvas.height = context.canvas.height;
+      replayContext = this.context_;
+    } else {
+      replayContext = context;
+    }
+    // for performance reasons, context.save / context.restore is not used
+    // to save and restore the transformation matrix and the opacity.
+    // see http://jsperf.com/context-save-restore-versus-variable
+    var alpha = replayContext.globalAlpha;
+    replayContext.globalAlpha = layerState.opacity;
+
+    replayGroup.replay(replayContext, pixelRatio, transform, rotation,
+        skippedFeatureUids);
+    if (vectorSource.getWrapX() && projection.canWrapX() &&
+        !ol.extent.containsExtent(projectionExtent, extent)) {
+      var startX = extent[0];
+      var worldWidth = ol.extent.getWidth(projectionExtent);
+      var world = 0;
+      var offsetX;
+      while (startX < projectionExtent[0]) {
+        --world;
+        offsetX = worldWidth * world;
+        transform = this.getTransform(frameState, offsetX);
+        replayGroup.replay(replayContext, pixelRatio, transform, rotation,
+            skippedFeatureUids);
+        startX += worldWidth;
+      }
+      world = 0;
+      startX = extent[2];
+      while (startX > projectionExtent[2]) {
+        ++world;
+        offsetX = worldWidth * world;
+        transform = this.getTransform(frameState, offsetX);
+        replayGroup.replay(replayContext, pixelRatio, transform, rotation,
+            skippedFeatureUids);
+        startX -= worldWidth;
+      }
+      // restore original transform for render and compose events
+      transform = this.getTransform(frameState, 0);
+    }
+
+    if (replayContext != context) {
+      this.dispatchRenderEvent(replayContext, frameState, transform);
+      context.drawImage(replayContext.canvas, 0, 0);
+    }
+    replayContext.globalAlpha = alpha;
+  }
+
+  this.dispatchPostComposeEvent(context, frameState, transform);
+
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.VectorLayer.prototype.forEachFeatureAtCoordinate =
+    function(coordinate, frameState, callback, thisArg) {
+  if (!this.replayGroup_) {
+    return undefined;
+  } else {
+    var resolution = frameState.viewState.resolution;
+    var rotation = frameState.viewState.rotation;
+    var layer = this.getLayer();
+    var layerState = frameState.layerStates[goog.getUid(layer)];
+    /** @type {Object.<string, boolean>} */
+    var features = {};
+    return this.replayGroup_.forEachFeatureAtCoordinate(coordinate, resolution,
+        rotation, layerState.managed ? frameState.skippedFeatureUids : {},
+        /**
+         * @param {ol.Feature|ol.render.Feature} feature Feature.
+         * @return {?} Callback result.
+         */
+        function(feature) {
+          goog.asserts.assert(feature !== undefined, 'received a feature');
+          var key = goog.getUid(feature).toString();
+          if (!(key in features)) {
+            features[key] = true;
+            return callback.call(thisArg, feature, layer);
+          }
+        });
+  }
+};
+
+
+/**
+ * Handle changes in image style state.
+ * @param {goog.events.Event} event Image style change event.
+ * @private
+ */
+ol.renderer.canvas.VectorLayer.prototype.handleStyleImageChange_ =
+    function(event) {
+  this.renderIfReadyAndVisible();
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.VectorLayer.prototype.prepareFrame =
+    function(frameState, layerState) {
+
+  var vectorLayer = /** @type {ol.layer.Vector} */ (this.getLayer());
+  goog.asserts.assertInstanceof(vectorLayer, ol.layer.Vector,
+      'layer is an instance of ol.layer.Vector');
+  var vectorSource = vectorLayer.getSource();
+
+  this.updateAttributions(
+      frameState.attributions, vectorSource.getAttributions());
+  this.updateLogos(frameState, vectorSource);
+
+  var animating = frameState.viewHints[ol.ViewHint.ANIMATING];
+  var interacting = frameState.viewHints[ol.ViewHint.INTERACTING];
+  var updateWhileAnimating = vectorLayer.getUpdateWhileAnimating();
+  var updateWhileInteracting = vectorLayer.getUpdateWhileInteracting();
+
+  if (!this.dirty_ && (!updateWhileAnimating && animating) ||
+      (!updateWhileInteracting && interacting)) {
+    return true;
+  }
+
+  var frameStateExtent = frameState.extent;
+  var viewState = frameState.viewState;
+  var projection = viewState.projection;
+  var resolution = viewState.resolution;
+  var pixelRatio = frameState.pixelRatio;
+  var vectorLayerRevision = vectorLayer.getRevision();
+  var vectorLayerRenderBuffer = vectorLayer.getRenderBuffer();
+  var vectorLayerRenderOrder = vectorLayer.getRenderOrder();
+
+  if (vectorLayerRenderOrder === undefined) {
+    vectorLayerRenderOrder = ol.renderer.vector.defaultOrder;
+  }
+
+  var extent = ol.extent.buffer(frameStateExtent,
+      vectorLayerRenderBuffer * resolution);
+  var projectionExtent = viewState.projection.getExtent();
+
+  if (vectorSource.getWrapX() && viewState.projection.canWrapX() &&
+      !ol.extent.containsExtent(projectionExtent, frameState.extent)) {
+    // For the replay group, we need an extent that intersects the real world
+    // (-180° to +180°). To support geometries in a coordinate range from -540°
+    // to +540°, we add at least 1 world width on each side of the projection
+    // extent. If the viewport is wider than the world, we need to add half of
+    // the viewport width to make sure we cover the whole viewport.
+    var worldWidth = ol.extent.getWidth(projectionExtent);
+    var buffer = Math.max(ol.extent.getWidth(extent) / 2, worldWidth);
+    extent[0] = projectionExtent[0] - buffer;
+    extent[2] = projectionExtent[2] + buffer;
+  }
+
+  if (!this.dirty_ &&
+      this.renderedResolution_ == resolution &&
+      this.renderedRevision_ == vectorLayerRevision &&
+      this.renderedRenderOrder_ == vectorLayerRenderOrder &&
+      ol.extent.containsExtent(this.renderedExtent_, extent)) {
+    return true;
+  }
+
+  // FIXME dispose of old replayGroup in post render
+  goog.dispose(this.replayGroup_);
+  this.replayGroup_ = null;
+
+  this.dirty_ = false;
+
+  var replayGroup =
+      new ol.render.canvas.ReplayGroup(
+          ol.renderer.vector.getTolerance(resolution, pixelRatio), extent,
+          resolution, vectorLayer.getRenderBuffer());
+  vectorSource.loadFeatures(extent, resolution, projection);
+  var renderFeature =
+      /**
+       * @param {ol.Feature} feature Feature.
+       * @this {ol.renderer.canvas.VectorLayer}
+       */
+      function(feature) {
+    var styles;
+    var styleFunction = feature.getStyleFunction();
+    if (styleFunction) {
+      styles = styleFunction.call(feature, resolution);
+    } else {
+      styleFunction = vectorLayer.getStyleFunction();
+      if (styleFunction) {
+        styles = styleFunction(feature, resolution);
+      }
+    }
+    if (styles) {
+      var dirty = this.renderFeature(
+          feature, resolution, pixelRatio, styles, replayGroup);
+      this.dirty_ = this.dirty_ || dirty;
+    }
+  };
+  if (vectorLayerRenderOrder) {
+    /** @type {Array.<ol.Feature>} */
+    var features = [];
+    vectorSource.forEachFeatureInExtent(extent,
+        /**
+         * @param {ol.Feature} feature Feature.
+         */
+        function(feature) {
+          features.push(feature);
+        }, this);
+    features.sort(vectorLayerRenderOrder);
+    features.forEach(renderFeature, this);
+  } else {
+    vectorSource.forEachFeatureInExtent(extent, renderFeature, this);
+  }
+  replayGroup.finish();
+
+  this.renderedResolution_ = resolution;
+  this.renderedRevision_ = vectorLayerRevision;
+  this.renderedRenderOrder_ = vectorLayerRenderOrder;
+  this.renderedExtent_ = extent;
+  this.replayGroup_ = replayGroup;
+
+  return true;
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature.
+ * @param {number} resolution Resolution.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {(ol.style.Style|Array.<ol.style.Style>)} styles The style or array of
+ *     styles.
+ * @param {ol.render.canvas.ReplayGroup} replayGroup Replay group.
+ * @return {boolean} `true` if an image is loading.
+ */
+ol.renderer.canvas.VectorLayer.prototype.renderFeature =
+    function(feature, resolution, pixelRatio, styles, replayGroup) {
+  if (!styles) {
+    return false;
+  }
+  var loading = false;
+  if (goog.isArray(styles)) {
+    for (var i = 0, ii = styles.length; i < ii; ++i) {
+      loading = ol.renderer.vector.renderFeature(
+          replayGroup, feature, styles[i],
+          ol.renderer.vector.getSquaredTolerance(resolution, pixelRatio),
+          this.handleStyleImageChange_, this) || loading;
+    }
+  } else {
+    loading = ol.renderer.vector.renderFeature(
+        replayGroup, feature, styles,
+        ol.renderer.vector.getSquaredTolerance(resolution, pixelRatio),
+        this.handleStyleImageChange_, this) || loading;
+  }
+  return loading;
+};
+
+goog.provide('ol.TileUrlFunction');
+goog.provide('ol.TileUrlFunctionType');
+
+goog.require('goog.asserts');
+goog.require('goog.math');
+goog.require('ol.TileCoord');
+goog.require('ol.tilecoord');
+
+
+/**
+ * {@link ol.source.Tile} sources use a function of this type to get the url
+ * that provides a tile for a given tile coordinate.
+ *
+ * This function takes an {@link ol.TileCoord} for the tile coordinate, a
+ * `{number}` representing the pixel ratio and an {@link ol.proj.Projection} for
+ * the projection  as arguments and returns a `{string}` representing the tile
+ * URL, or undefined if no tile should be requested for the passed tile
+ * coordinate.
+ *
+ * @typedef {function(ol.TileCoord, number,
+ *           ol.proj.Projection): (string|undefined)}
+ * @api
+ */
+ol.TileUrlFunctionType;
+
+
+/**
+ * @typedef {function(ol.TileCoord, ol.proj.Projection, ol.TileCoord=):
+ *     ol.TileCoord}
+ */
+ol.TileCoordTransformType;
+
+
+/**
+ * @param {string} template Template.
+ * @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
+ * @return {ol.TileUrlFunctionType} Tile URL function.
+ */
+ol.TileUrlFunction.createFromTemplate = function(template, tileGrid) {
+  var zRegEx = /\{z\}/g;
+  var xRegEx = /\{x\}/g;
+  var yRegEx = /\{y\}/g;
+  var dashYRegEx = /\{-y\}/g;
+  return (
+      /**
+       * @param {ol.TileCoord} tileCoord Tile Coordinate.
+       * @param {number} pixelRatio Pixel ratio.
+       * @param {ol.proj.Projection} projection Projection.
+       * @return {string|undefined} Tile URL.
+       */
+      function(tileCoord, pixelRatio, projection) {
+        if (!tileCoord) {
+          return undefined;
+        } else {
+          return template.replace(zRegEx, tileCoord[0].toString())
+              .replace(xRegEx, tileCoord[1].toString())
+              .replace(yRegEx, function() {
+                var y = -tileCoord[2] - 1;
+                return y.toString();
+              })
+              .replace(dashYRegEx, function() {
+                var z = tileCoord[0];
+                var range = tileGrid.getFullTileRange(z);
+                goog.asserts.assert(range,
+                    'The {-y} template requires a tile grid with extent');
+                var y = range.getHeight() + tileCoord[2];
+                return y.toString();
+              });
+        }
+      });
+};
+
+
+/**
+ * @param {Array.<string>} templates Templates.
+ * @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
+ * @return {ol.TileUrlFunctionType} Tile URL function.
+ */
+ol.TileUrlFunction.createFromTemplates = function(templates, tileGrid) {
+  var len = templates.length;
+  var tileUrlFunctions = new Array(len);
+  for (var i = 0; i < len; ++i) {
+    tileUrlFunctions[i] = ol.TileUrlFunction.createFromTemplate(
+        templates[i], tileGrid);
+  }
+  return ol.TileUrlFunction.createFromTileUrlFunctions(tileUrlFunctions);
+};
+
+
+/**
+ * @param {Array.<ol.TileUrlFunctionType>} tileUrlFunctions Tile URL Functions.
+ * @return {ol.TileUrlFunctionType} Tile URL function.
+ */
+ol.TileUrlFunction.createFromTileUrlFunctions = function(tileUrlFunctions) {
+  goog.asserts.assert(tileUrlFunctions.length > 0,
+      'Length of tile url functions should be greater than 0');
+  if (tileUrlFunctions.length === 1) {
+    return tileUrlFunctions[0];
+  }
+  return (
+      /**
+       * @param {ol.TileCoord} tileCoord Tile Coordinate.
+       * @param {number} pixelRatio Pixel ratio.
+       * @param {ol.proj.Projection} projection Projection.
+       * @return {string|undefined} Tile URL.
+       */
+      function(tileCoord, pixelRatio, projection) {
+        if (!tileCoord) {
+          return undefined;
+        } else {
+          var h = ol.tilecoord.hash(tileCoord);
+          var index = goog.math.modulo(h, tileUrlFunctions.length);
+          return tileUrlFunctions[index](tileCoord, pixelRatio, projection);
+        }
+      });
+};
+
+
+/**
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {string|undefined} Tile URL.
+ */
+ol.TileUrlFunction.nullTileUrlFunction =
+    function(tileCoord, pixelRatio, projection) {
+  return undefined;
+};
+
+
+/**
+ * @param {string} url URL.
+ * @return {Array.<string>} Array of urls.
+ */
+ol.TileUrlFunction.expandUrl = function(url) {
+  var urls = [];
+  var match = /\{(\d)-(\d)\}/.exec(url) || /\{([a-z])-([a-z])\}/.exec(url);
+  if (match) {
+    var startCharCode = match[1].charCodeAt(0);
+    var stopCharCode = match[2].charCodeAt(0);
+    var charCode;
+    for (charCode = startCharCode; charCode <= stopCharCode; ++charCode) {
+      urls.push(url.replace(match[0], String.fromCharCode(charCode)));
+    }
+  } else {
+    urls.push(url);
+  }
+  return urls;
+};
+
+goog.provide('ol.source.UrlTile');
+
+goog.require('goog.events');
+goog.require('ol.TileLoadFunctionType');
+goog.require('ol.TileState');
+goog.require('ol.TileUrlFunction');
+goog.require('ol.TileUrlFunctionType');
+goog.require('ol.proj');
+goog.require('ol.source.Tile');
+goog.require('ol.source.TileEvent');
+
+
+/**
+ * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
+ *            extent: (ol.Extent|undefined),
+ *            logo: (string|olx.LogoOptions|undefined),
+ *            opaque: (boolean|undefined),
+ *            projection: ol.proj.ProjectionLike,
+ *            state: (ol.source.State|string|undefined),
+ *            tileGrid: (ol.tilegrid.TileGrid|undefined),
+ *            tileLoadFunction: ol.TileLoadFunctionType,
+ *            tilePixelRatio: (number|undefined),
+ *            tileUrlFunction: (ol.TileUrlFunctionType|undefined),
+ *            url: (string|undefined),
+ *            urls: (Array.<string>|undefined),
+ *            wrapX: (boolean|undefined)}}
+ */
+ol.source.UrlTileOptions;
+
+
+
+/**
+ * @classdesc
+ * Base class for sources providing tiles divided into a tile grid over http.
+ *
+ * @constructor
+ * @fires ol.source.TileEvent
+ * @extends {ol.source.Tile}
+ * @param {ol.source.UrlTileOptions} options Image tile options.
+ */
+ol.source.UrlTile = function(options) {
+
+  goog.base(this, {
+    attributions: options.attributions,
+    cacheSize: options.cacheSize,
+    extent: options.extent,
+    logo: options.logo,
+    opaque: options.opaque,
+    projection: options.projection,
+    state: options.state ?
+        /** @type {ol.source.State} */ (options.state) : undefined,
+    tileGrid: options.tileGrid,
+    tilePixelRatio: options.tilePixelRatio,
+    wrapX: options.wrapX
+  });
+
+  /**
+   * @protected
+   * @type {ol.TileLoadFunctionType}
+   */
+  this.tileLoadFunction = options.tileLoadFunction;
+
+  /**
+   * @protected
+   * @type {ol.TileUrlFunctionType}
+   */
+  this.tileUrlFunction = options.tileUrlFunction ?
+      options.tileUrlFunction :
+      ol.TileUrlFunction.nullTileUrlFunction;
+
+  /**
+   * @protected
+   * @type {!Array.<string>|null}
+   */
+  this.urls = null;
+
+  if (options.urls) {
+    if (options.tileUrlFunction) {
+      this.urls = options.urls;
+    } else {
+      this.setUrls(options.urls);
+    }
+  } else if (options.url) {
+    this.setUrl(options.url);
+  }
+  if (options.tileUrlFunction) {
+    this.setTileUrlFunction(options.tileUrlFunction);
+  }
+
+};
+goog.inherits(ol.source.UrlTile, ol.source.Tile);
+
+
+/**
+ * Return the tile load function of the source.
+ * @return {ol.TileLoadFunctionType} TileLoadFunction
+ * @api
+ */
+ol.source.UrlTile.prototype.getTileLoadFunction = function() {
+  return this.tileLoadFunction;
+};
+
+
+/**
+ * Return the tile URL function of the source.
+ * @return {ol.TileUrlFunctionType} TileUrlFunction
+ * @api
+ */
+ol.source.UrlTile.prototype.getTileUrlFunction = function() {
+  return this.tileUrlFunction;
+};
+
+
+/**
+ * Return the URLs used for this source.
+ * When a tileUrlFunction is used instead of url or urls,
+ * null will be returned.
+ * @return {!Array.<string>|null} URLs.
+ * @api
+ */
+ol.source.UrlTile.prototype.getUrls = function() {
+  return this.urls;
+};
+
+
+/**
+ * Handle tile change events.
+ * @param {goog.events.Event} event Event.
+ * @protected
+ */
+ol.source.UrlTile.prototype.handleTileChange = function(event) {
+  var tile = /** @type {ol.Tile} */ (event.target);
+  switch (tile.getState()) {
+    case ol.TileState.LOADING:
+      this.dispatchEvent(
+          new ol.source.TileEvent(ol.source.TileEventType.TILELOADSTART, tile));
+      break;
+    case ol.TileState.LOADED:
+      this.dispatchEvent(
+          new ol.source.TileEvent(ol.source.TileEventType.TILELOADEND, tile));
+      break;
+    case ol.TileState.ERROR:
+      this.dispatchEvent(
+          new ol.source.TileEvent(ol.source.TileEventType.TILELOADERROR, tile));
+      break;
+  }
+};
+
+
+/**
+ * Set the tile load function of the source.
+ * @param {ol.TileLoadFunctionType} tileLoadFunction Tile load function.
+ * @api
+ */
+ol.source.UrlTile.prototype.setTileLoadFunction = function(tileLoadFunction) {
+  this.tileCache.clear();
+  this.tileLoadFunction = tileLoadFunction;
+  this.changed();
+};
+
+
+/**
+ * Set the tile URL function of the source.
+ * @param {ol.TileUrlFunctionType} tileUrlFunction Tile URL function.
+ * @api
+ */
+ol.source.UrlTile.prototype.setTileUrlFunction = function(tileUrlFunction) {
+  // FIXME It should be possible to be more intelligent and avoid clearing the
+  // FIXME cache.  The tile URL function would need to be incorporated into the
+  // FIXME cache key somehow.
+  this.tileCache.clear();
+  this.tileUrlFunction = tileUrlFunction;
+  this.changed();
+};
+
+
+/**
+ * Set the URL to use for requests.
+ * @param {string} url URL.
+ * @api stable
+ */
+ol.source.UrlTile.prototype.setUrl = function(url) {
+  this.setTileUrlFunction(ol.TileUrlFunction.createFromTemplates(
+      ol.TileUrlFunction.expandUrl(url), this.tileGrid));
+  this.urls = [url];
+};
+
+
+/**
+ * Set the URLs to use for requests.
+ * @param {Array.<string>} urls URLs.
+ * @api stable
+ */
+ol.source.UrlTile.prototype.setUrls = function(urls) {
+  this.setTileUrlFunction(ol.TileUrlFunction.createFromTemplates(
+      urls, this.tileGrid));
+  this.urls = urls;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.UrlTile.prototype.useTile = function(z, x, y) {
+  var tileCoordKey = this.getKeyZXY(z, x, y);
+  if (this.tileCache.containsKey(tileCoordKey)) {
+    this.tileCache.get(tileCoordKey);
+  }
+};
+
+goog.provide('ol.source.VectorTile');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('ol.TileState');
+goog.require('ol.VectorTile');
+goog.require('ol.featureloader');
+goog.require('ol.source.UrlTile');
+
+
+
+/**
+ * @classdesc
+ * Class for layer sources providing vector data divided into a tile grid, to be
+ * used with {@link ol.layer.VectorTile}. Although this source receives tiles
+ * with vector features from the server, it is not meant for feature editing.
+ * Features are optimized for rendering, their geometries are clipped at or near
+ * tile boundaries and simplified for a view resolution. See
+ * {@link ol.source.Vector} for vector sources that are suitable for feature
+ * editing.
+ *
+ * @constructor
+ * @fires ol.source.TileEvent
+ * @extends {ol.source.UrlTile}
+ * @param {olx.source.VectorTileOptions} options Vector tile options.
+ * @api
+ */
+ol.source.VectorTile = function(options) {
+
+  goog.base(this, {
+    attributions: options.attributions,
+    cacheSize: ol.DEFAULT_TILE_CACHE_HIGH_WATER_MARK / 16,
+    extent: options.extent,
+    logo: options.logo,
+    opaque: options.opaque,
+    projection: options.projection,
+    state: options.state ?
+        /** @type {ol.source.State} */ (options.state) : undefined,
+    tileGrid: options.tileGrid,
+    tileLoadFunction: options.tileLoadFunction ?
+        options.tileLoadFunction : ol.source.VectorTile.defaultTileLoadFunction,
+    tileUrlFunction: options.tileUrlFunction,
+    tilePixelRatio: options.tilePixelRatio,
+    url: options.url,
+    urls: options.urls,
+    wrapX: options.wrapX === undefined ? true : options.wrapX
+  });
+
+  /**
+   * @private
+   * @type {ol.format.Feature}
+   */
+  this.format_ = options.format ? options.format : null;
+
+  /**
+   * @protected
+   * @type {function(new: ol.VectorTile, ol.TileCoord, ol.TileState, string,
+   *        ol.format.Feature, ol.TileLoadFunctionType, ol.proj.Projection)}
+   */
+  this.tileClass = options.tileClass ? options.tileClass : ol.VectorTile;
+
+};
+goog.inherits(ol.source.VectorTile, ol.source.UrlTile);
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.VectorTile.prototype.getTile =
+    function(z, x, y, pixelRatio, projection) {
+  var tileCoordKey = this.getKeyZXY(z, x, y);
+  if (this.tileCache.containsKey(tileCoordKey)) {
+    return /** @type {!ol.Tile} */ (this.tileCache.get(tileCoordKey));
+  } else {
+    goog.asserts.assert(projection, 'argument projection is truthy');
+    var tileCoord = [z, x, y];
+    var urlTileCoord = this.getTileCoordForTileUrlFunction(
+        tileCoord, projection);
+    var tileUrl = urlTileCoord ?
+        this.tileUrlFunction(urlTileCoord, pixelRatio, projection) : undefined;
+    var tile = new this.tileClass(
+        tileCoord,
+        tileUrl !== undefined ? ol.TileState.IDLE : ol.TileState.EMPTY,
+        tileUrl !== undefined ? tileUrl : '',
+        this.format_, this.tileLoadFunction, projection);
+    goog.events.listen(tile, goog.events.EventType.CHANGE,
+        this.handleTileChange, false, this);
+
+    this.tileCache.set(tileCoordKey, tile);
+    return tile;
+  }
+};
+
+
+/**
+ * @param {ol.VectorTile} vectorTile Vector tile.
+ * @param {string} url URL.
+ */
+ol.source.VectorTile.defaultTileLoadFunction = function(vectorTile, url) {
+  vectorTile.setLoader(ol.featureloader.tile(url, vectorTile.getFormat()));
+};
+
+goog.provide('ol.renderer.canvas.VectorTileLayer');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.vec.Mat4');
+goog.require('ol.Feature');
+goog.require('ol.TileRange');
+goog.require('ol.TileState');
+goog.require('ol.VectorTile');
+goog.require('ol.ViewHint');
+goog.require('ol.array');
+goog.require('ol.dom');
+goog.require('ol.extent');
+goog.require('ol.layer.VectorTile');
+goog.require('ol.proj.Units');
+goog.require('ol.render.EventType');
+goog.require('ol.render.canvas.ReplayGroup');
+goog.require('ol.renderer.canvas.Layer');
+goog.require('ol.renderer.vector');
+goog.require('ol.size');
+goog.require('ol.source.VectorTile');
+goog.require('ol.tilecoord');
+goog.require('ol.vec.Mat4');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.renderer.canvas.Layer}
+ * @param {ol.layer.VectorTile} layer VectorTile layer.
+ */
+ol.renderer.canvas.VectorTileLayer = function(layer) {
+
+  goog.base(this, layer);
+
+  /**
+   * @private
+   * @type {CanvasRenderingContext2D}
+   */
+  this.context_ = ol.dom.createCanvasContext2D();
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.dirty_ = false;
+
+  /**
+   * @private
+   * @type {Array.<ol.VectorTile>}
+   */
+  this.renderedTiles_ = [];
+
+  /**
+   * @private
+   * @type {ol.Extent}
+   */
+  this.tmpExtent_ = ol.extent.createEmpty();
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.tmpSize_ = [NaN, NaN];
+
+  /**
+   * @private
+   * @type {!goog.vec.Mat4.Number}
+   */
+  this.tmpTransform_ = goog.vec.Mat4.createNumber();
+
+};
+goog.inherits(ol.renderer.canvas.VectorTileLayer, ol.renderer.canvas.Layer);
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.VectorTileLayer.prototype.composeFrame =
+    function(frameState, layerState, context) {
+
+  var pixelRatio = frameState.pixelRatio;
+  var skippedFeatureUids = layerState.managed ?
+      frameState.skippedFeatureUids : {};
+  var viewState = frameState.viewState;
+  var center = viewState.center;
+  var projection = viewState.projection;
+  var resolution = viewState.resolution;
+  var rotation = viewState.rotation;
+  var layer = this.getLayer();
+  var source = layer.getSource();
+  goog.asserts.assertInstanceof(source, ol.source.VectorTile,
+      'Source is an ol.source.VectorTile');
+
+  var transform = this.getTransform(frameState, 0);
+
+  this.dispatchPreComposeEvent(context, frameState, transform);
+
+  var replayContext;
+  if (layer.hasListener(ol.render.EventType.RENDER)) {
+    // resize and clear
+    this.context_.canvas.width = context.canvas.width;
+    this.context_.canvas.height = context.canvas.height;
+    replayContext = this.context_;
+  } else {
+    replayContext = context;
+  }
+  // for performance reasons, context.save / context.restore is not used
+  // to save and restore the transformation matrix and the opacity.
+  // see http://jsperf.com/context-save-restore-versus-variable
+  var alpha = replayContext.globalAlpha;
+  replayContext.globalAlpha = layerState.opacity;
+
+  var tilesToDraw = this.renderedTiles_;
+  var tileGrid = source.getTileGrid();
+
+  var currentZ, i, ii, origin, tile, tileSize;
+  var tilePixelRatio, tilePixelResolution, tilePixelSize, tileResolution;
+  for (i = 0, ii = tilesToDraw.length; i < ii; ++i) {
+    tile = tilesToDraw[i];
+    currentZ = tile.getTileCoord()[0];
+    tileSize = tileGrid.getTileSize(currentZ);
+    tilePixelSize = source.getTilePixelSize(currentZ, pixelRatio, projection);
+    tilePixelRatio = tilePixelSize[0] /
+        ol.size.toSize(tileSize, this.tmpSize_)[0];
+    tileResolution = tileGrid.getResolution(currentZ);
+    tilePixelResolution = tileResolution / tilePixelRatio;
+    if (tile.getProjection().getUnits() == ol.proj.Units.TILE_PIXELS) {
+      origin = ol.extent.getTopLeft(tileGrid.getTileCoordExtent(
+          tile.getTileCoord(), this.tmpExtent_));
+      transform = ol.vec.Mat4.makeTransform2D(this.tmpTransform_,
+          pixelRatio * frameState.size[0] / 2,
+          pixelRatio * frameState.size[1] / 2,
+          pixelRatio * tilePixelResolution / resolution,
+          pixelRatio * tilePixelResolution / resolution,
+          viewState.rotation,
+          (origin[0] - center[0]) / tilePixelResolution,
+          (center[1] - origin[1]) / tilePixelResolution);
+    }
+    tile.getReplayState().replayGroup.replay(replayContext, pixelRatio,
+        transform, rotation, skippedFeatureUids);
+  }
+
+  transform = this.getTransform(frameState, 0);
+
+  if (replayContext != context) {
+    this.dispatchRenderEvent(replayContext, frameState, transform);
+    context.drawImage(replayContext.canvas, 0, 0);
+  }
+  replayContext.globalAlpha = alpha;
+
+  this.dispatchPostComposeEvent(context, frameState, transform);
+};
+
+
+/**
+ * @param {ol.VectorTile} tile Tile.
+ * @param {ol.layer.VectorTile} layer Vector tile layer.
+ * @param {number} pixelRatio Pixel ratio.
+ */
+ol.renderer.canvas.VectorTileLayer.prototype.createReplayGroup = function(tile,
+    layer, pixelRatio) {
+  var revision = layer.getRevision();
+  var renderOrder = layer.getRenderOrder() || null;
+
+  var replayState = tile.getReplayState();
+  if (!replayState.dirty && replayState.renderedRevision == revision &&
+      replayState.renderedRenderOrder == renderOrder) {
+    return;
+  }
+
+  // FIXME dispose of old replayGroup in post render
+  goog.dispose(replayState.replayGroup);
+  replayState.replayGroup = null;
+  replayState.dirty = false;
+
+  var source = layer.getSource();
+  goog.asserts.assertInstanceof(source, ol.source.VectorTile,
+      'Source is an ol.source.VectorTile');
+  var tileGrid = source.getTileGrid();
+  var tileCoord = tile.getTileCoord();
+  var pixelSpace = tile.getProjection().getUnits() == ol.proj.Units.TILE_PIXELS;
+  var extent;
+  if (pixelSpace) {
+    var tilePixelSize = source.getTilePixelSize(tileCoord[0], pixelRatio,
+        tile.getProjection());
+    extent = [0, 0, tilePixelSize[0], tilePixelSize[1]];
+  } else {
+    extent = tileGrid.getTileCoordExtent(tileCoord);
+  }
+  var resolution = tileGrid.getResolution(tileCoord[0]);
+  var tileResolution = pixelSpace ? source.getTilePixelRatio() : resolution;
+  replayState.dirty = false;
+  var replayGroup = new ol.render.canvas.ReplayGroup(0, extent,
+      tileResolution, layer.getRenderBuffer());
+  var squaredTolerance = ol.renderer.vector.getSquaredTolerance(
+      tileResolution, pixelRatio);
+
+  /**
+   * @param {ol.Feature|ol.render.Feature} feature Feature.
+   * @this {ol.renderer.canvas.VectorTileLayer}
+   */
+  function renderFeature(feature) {
+    var styles;
+    var styleFunction = feature.getStyleFunction();
+    if (styleFunction) {
+      goog.asserts.assertInstanceof(feature, ol.Feature, 'Got an ol.Feature');
+      styles = styleFunction.call(feature, resolution);
+    } else {
+      styleFunction = layer.getStyleFunction();
+      if (styleFunction) {
+        styles = styleFunction(feature, resolution);
+      }
+    }
+    if (styles) {
+      if (!goog.isArray(styles)) {
+        styles = [styles];
+      }
+      var dirty = this.renderFeature(feature, squaredTolerance, styles,
+          replayGroup);
+      this.dirty_ = this.dirty_ || dirty;
+      replayState.dirty = replayState.dirty || dirty;
+    }
+  }
+
+  var features = tile.getFeatures();
+  if (renderOrder && renderOrder !== replayState.renderedRenderOrder) {
+    features.sort(renderOrder);
+  }
+  features.forEach(renderFeature, this);
+
+  replayGroup.finish();
+
+  replayState.renderedRevision = revision;
+  replayState.renderedRenderOrder = renderOrder;
+  replayState.replayGroup = replayGroup;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.VectorTileLayer.prototype.forEachFeatureAtCoordinate =
+    function(coordinate, frameState, callback, thisArg) {
+  var resolution = frameState.viewState.resolution;
+  var rotation = frameState.viewState.rotation;
+  var layer = this.getLayer();
+  var layerState = frameState.layerStates[goog.getUid(layer)];
+  /** @type {Object.<string, boolean>} */
+  var features = {};
+
+  var replayables = this.renderedTiles_;
+  var source = layer.getSource();
+  goog.asserts.assertInstanceof(source, ol.source.VectorTile,
+      'Source is an ol.source.VectorTile');
+  var tileGrid = source.getTileGrid();
+  var found, tileSpaceCoordinate;
+  var i, ii, origin, replayGroup;
+  var tile, tileCoord, tileExtent, tilePixelRatio, tileResolution;
+  for (i = 0, ii = replayables.length; i < ii; ++i) {
+    tile = replayables[i];
+    tileCoord = tile.getTileCoord();
+    tileExtent = source.getTileGrid().getTileCoordExtent(tileCoord,
+        this.tmpExtent_);
+    if (!ol.extent.containsCoordinate(tileExtent, coordinate)) {
+      continue;
+    }
+    if (tile.getProjection().getUnits() === ol.proj.Units.TILE_PIXELS) {
+      origin = ol.extent.getTopLeft(tileExtent);
+      tilePixelRatio = source.getTilePixelRatio();
+      tileResolution = tileGrid.getResolution(tileCoord[0]) / tilePixelRatio;
+      tileSpaceCoordinate = [
+        (coordinate[0] - origin[0]) / tileResolution,
+        (origin[1] - coordinate[1]) / tileResolution
+      ];
+      resolution = tilePixelRatio;
+    } else {
+      tileSpaceCoordinate = coordinate;
+    }
+    replayGroup = tile.getReplayState().replayGroup;
+    found = found || replayGroup.forEachFeatureAtCoordinate(
+        tileSpaceCoordinate, resolution, rotation,
+        layerState.managed ? frameState.skippedFeatureUids : {},
+        /**
+         * @param {ol.Feature|ol.render.Feature} feature Feature.
+         * @return {?} Callback result.
+         */
+        function(feature) {
+          goog.asserts.assert(feature, 'received a feature');
+          var key = goog.getUid(feature).toString();
+          if (!(key in features)) {
+            features[key] = true;
+            return callback.call(thisArg, feature, layer);
+          }
+        });
+  }
+  return found;
+};
+
+
+/**
+ * Handle changes in image style state.
+ * @param {goog.events.Event} event Image style change event.
+ * @private
+ */
+ol.renderer.canvas.VectorTileLayer.prototype.handleStyleImageChange_ =
+    function(event) {
+  this.renderIfReadyAndVisible();
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.VectorTileLayer.prototype.prepareFrame =
+    function(frameState, layerState) {
+  var layer = /** @type {ol.layer.Vector} */ (this.getLayer());
+  goog.asserts.assertInstanceof(layer, ol.layer.VectorTile,
+      'layer is an instance of ol.layer.VectorTile');
+  var source = layer.getSource();
+  goog.asserts.assertInstanceof(source, ol.source.VectorTile,
+      'Source is an ol.source.VectorTile');
+
+  this.updateAttributions(
+      frameState.attributions, source.getAttributions());
+  this.updateLogos(frameState, source);
+
+  var animating = frameState.viewHints[ol.ViewHint.ANIMATING];
+  var interacting = frameState.viewHints[ol.ViewHint.INTERACTING];
+  var updateWhileAnimating = layer.getUpdateWhileAnimating();
+  var updateWhileInteracting = layer.getUpdateWhileInteracting();
+
+  if (!this.dirty_ && (!updateWhileAnimating && animating) ||
+      (!updateWhileInteracting && interacting)) {
+    return true;
+  }
+
+  var extent = frameState.extent;
+  if (layerState.extent) {
+    extent = ol.extent.getIntersection(extent, layerState.extent);
+  }
+  if (ol.extent.isEmpty(extent)) {
+    // Return false to prevent the rendering of the layer.
+    return false;
+  }
+
+  var viewState = frameState.viewState;
+  var projection = viewState.projection;
+  var resolution = viewState.resolution;
+  var pixelRatio = frameState.pixelRatio;
+
+  var tileGrid = source.getTileGrid();
+  var resolutions = tileGrid.getResolutions();
+  var z = resolutions.length - 1;
+  while (z > 0 && resolutions[z] < resolution) {
+    --z;
+  }
+  var tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z);
+  this.updateUsedTiles(frameState.usedTiles, source, z, tileRange);
+  this.manageTilePyramid(frameState, source, tileGrid, pixelRatio,
+      projection, extent, z, layer.getPreload());
+  this.scheduleExpireCache(frameState, source);
+
+  /**
+   * @type {Object.<number, Object.<string, ol.VectorTile>>}
+   */
+  var tilesToDrawByZ = {};
+  tilesToDrawByZ[z] = {};
+
+  var findLoadedTiles = this.createLoadedTileFinder(source, projection,
+      tilesToDrawByZ);
+
+  var useInterimTilesOnError = layer.getUseInterimTilesOnError();
+
+  var tmpExtent = this.tmpExtent_;
+  var tmpTileRange = new ol.TileRange(0, 0, 0, 0);
+  var childTileRange, fullyLoaded, tile, tileState, x, y;
+  for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
+    for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
+
+      tile = source.getTile(z, x, y, pixelRatio, projection);
+      goog.asserts.assertInstanceof(tile, ol.VectorTile,
+          'Tile is an ol.VectorTile');
+      tileState = tile.getState();
+      if (tileState == ol.TileState.LOADED ||
+          tileState == ol.TileState.EMPTY ||
+          (tileState == ol.TileState.ERROR && !useInterimTilesOnError)) {
+        tilesToDrawByZ[z][ol.tilecoord.toString(tile.tileCoord)] = tile;
+        continue;
+      }
+
+      fullyLoaded = tileGrid.forEachTileCoordParentTileRange(
+          tile.tileCoord, findLoadedTiles, null, tmpTileRange, tmpExtent);
+      if (!fullyLoaded) {
+        childTileRange = tileGrid.getTileCoordChildTileRange(
+            tile.tileCoord, tmpTileRange, tmpExtent);
+        if (childTileRange) {
+          findLoadedTiles(z + 1, childTileRange);
+        }
+      }
+
+    }
+  }
+
+  this.dirty_ = false;
+
+  /** @type {Array.<number>} */
+  var zs = Object.keys(tilesToDrawByZ).map(Number);
+  zs.sort(ol.array.numberSafeCompareFunction);
+  var replayables = [];
+  var i, ii, currentZ, tileCoordKey, tilesToDraw;
+  for (i = 0, ii = zs.length; i < ii; ++i) {
+    currentZ = zs[i];
+    tilesToDraw = tilesToDrawByZ[currentZ];
+    for (tileCoordKey in tilesToDraw) {
+      tile = tilesToDraw[tileCoordKey];
+      if (tile.getState() == ol.TileState.LOADED) {
+        replayables.push(tile);
+        this.createReplayGroup(tile, layer, pixelRatio);
+      }
+    }
+  }
+
+  this.renderedTiles_ = replayables;
+
+  return true;
+};
+
+
+/**
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ * @param {number} squaredTolerance Squared tolerance.
+ * @param {(ol.style.Style|Array.<ol.style.Style>)} styles The style or array of
+ *     styles.
+ * @param {ol.render.canvas.ReplayGroup} replayGroup Replay group.
+ * @return {boolean} `true` if an image is loading.
+ */
+ol.renderer.canvas.VectorTileLayer.prototype.renderFeature =
+    function(feature, squaredTolerance, styles, replayGroup) {
+  if (!styles) {
+    return false;
+  }
+  var loading = false;
+  if (goog.isArray(styles)) {
+    for (var i = 0, ii = styles.length; i < ii; ++i) {
+      loading = ol.renderer.vector.renderFeature(
+          replayGroup, feature, styles[i], squaredTolerance,
+          this.handleStyleImageChange_, this) || loading;
+    }
+  } else {
+    loading = ol.renderer.vector.renderFeature(
+        replayGroup, feature, styles, squaredTolerance,
+        this.handleStyleImageChange_, this) || loading;
+  }
+  return loading;
+};
+
+// FIXME offset panning
+
+goog.provide('ol.renderer.canvas.Map');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.dom');
+goog.require('goog.style');
+goog.require('goog.vec.Mat4');
+goog.require('ol');
+goog.require('ol.RendererType');
+goog.require('ol.css');
+goog.require('ol.dom');
+goog.require('ol.layer.Image');
+goog.require('ol.layer.Layer');
+goog.require('ol.layer.Tile');
+goog.require('ol.layer.Vector');
+goog.require('ol.layer.VectorTile');
+goog.require('ol.render.Event');
+goog.require('ol.render.EventType');
+goog.require('ol.render.canvas.Immediate');
+goog.require('ol.renderer.Map');
+goog.require('ol.renderer.canvas.ImageLayer');
+goog.require('ol.renderer.canvas.Layer');
+goog.require('ol.renderer.canvas.TileLayer');
+goog.require('ol.renderer.canvas.VectorLayer');
+goog.require('ol.renderer.canvas.VectorTileLayer');
+goog.require('ol.source.State');
+goog.require('ol.vec.Mat4');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.renderer.Map}
+ * @param {Element} container Container.
+ * @param {ol.Map} map Map.
+ */
+ol.renderer.canvas.Map = function(container, map) {
+
+  goog.base(this, container, map);
+
+  /**
+   * @private
+   * @type {CanvasRenderingContext2D}
+   */
+  this.context_ = ol.dom.createCanvasContext2D();
+
+  /**
+   * @private
+   * @type {HTMLCanvasElement}
+   */
+  this.canvas_ = this.context_.canvas;
+
+  this.canvas_.style.width = '100%';
+  this.canvas_.style.height = '100%';
+  this.canvas_.className = ol.css.CLASS_UNSELECTABLE;
+  goog.dom.insertChildAt(container, this.canvas_, 0);
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.renderedVisible_ = true;
+
+  /**
+   * @private
+   * @type {!goog.vec.Mat4.Number}
+   */
+  this.transform_ = goog.vec.Mat4.createNumber();
+
+};
+goog.inherits(ol.renderer.canvas.Map, ol.renderer.Map);
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.Map.prototype.createLayerRenderer = function(layer) {
+  if (ol.ENABLE_IMAGE && layer instanceof ol.layer.Image) {
+    return new ol.renderer.canvas.ImageLayer(layer);
+  } else if (ol.ENABLE_TILE && layer instanceof ol.layer.Tile) {
+    return new ol.renderer.canvas.TileLayer(layer);
+  } else if (ol.ENABLE_VECTOR_TILE && layer instanceof ol.layer.VectorTile) {
+    return new ol.renderer.canvas.VectorTileLayer(layer);
+  } else if (ol.ENABLE_VECTOR && layer instanceof ol.layer.Vector) {
+    return new ol.renderer.canvas.VectorLayer(layer);
+  } else {
+    goog.asserts.fail('unexpected layer configuration');
+    return null;
+  }
+};
+
+
+/**
+ * @param {ol.render.EventType} type Event type.
+ * @param {olx.FrameState} frameState Frame state.
+ * @private
+ */
+ol.renderer.canvas.Map.prototype.dispatchComposeEvent_ =
+    function(type, frameState) {
+  var map = this.getMap();
+  var context = this.context_;
+  if (map.hasListener(type)) {
+    var extent = frameState.extent;
+    var pixelRatio = frameState.pixelRatio;
+    var viewState = frameState.viewState;
+    var rotation = viewState.rotation;
+
+    var transform = this.getTransform(frameState);
+
+    var vectorContext = new ol.render.canvas.Immediate(context, pixelRatio,
+        extent, transform, rotation);
+    var composeEvent = new ol.render.Event(type, map, vectorContext,
+        frameState, context, null);
+    map.dispatchEvent(composeEvent);
+
+    vectorContext.flush();
+  }
+};
+
+
+/**
+ * @param {olx.FrameState} frameState Frame state.
+ * @protected
+ * @return {!goog.vec.Mat4.Number} Transform.
+ */
+ol.renderer.canvas.Map.prototype.getTransform = function(frameState) {
+  var pixelRatio = frameState.pixelRatio;
+  var viewState = frameState.viewState;
+  var resolution = viewState.resolution;
+  return ol.vec.Mat4.makeTransform2D(this.transform_,
+      this.canvas_.width / 2, this.canvas_.height / 2,
+      pixelRatio / resolution, -pixelRatio / resolution,
+      -viewState.rotation,
+      -viewState.center[0], -viewState.center[1]);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.Map.prototype.getType = function() {
+  return ol.RendererType.CANVAS;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.canvas.Map.prototype.renderFrame = function(frameState) {
+
+  if (!frameState) {
+    if (this.renderedVisible_) {
+      goog.style.setElementShown(this.canvas_, false);
+      this.renderedVisible_ = false;
+    }
+    return;
+  }
+
+  var context = this.context_;
+  var width = frameState.size[0] * frameState.pixelRatio;
+  var height = frameState.size[1] * frameState.pixelRatio;
+  if (this.canvas_.width != width || this.canvas_.height != height) {
+    this.canvas_.width = width;
+    this.canvas_.height = height;
+  } else {
+    context.clearRect(0, 0, this.canvas_.width, this.canvas_.height);
+  }
+
+  this.calculateMatrices2D(frameState);
+
+  this.dispatchComposeEvent_(ol.render.EventType.PRECOMPOSE, frameState);
+
+  var layerStatesArray = frameState.layerStatesArray;
+  goog.array.stableSort(layerStatesArray, ol.renderer.Map.sortByZIndex);
+
+  var viewResolution = frameState.viewState.resolution;
+  var i, ii, layer, layerRenderer, layerState;
+  for (i = 0, ii = layerStatesArray.length; i < ii; ++i) {
+    layerState = layerStatesArray[i];
+    layer = layerState.layer;
+    layerRenderer = this.getLayerRenderer(layer);
+    goog.asserts.assertInstanceof(layerRenderer, ol.renderer.canvas.Layer,
+        'layerRenderer is an instance of ol.renderer.canvas.Layer');
+    if (!ol.layer.Layer.visibleAtResolution(layerState, viewResolution) ||
+        layerState.sourceState != ol.source.State.READY) {
+      continue;
+    }
+    if (layerRenderer.prepareFrame(frameState, layerState)) {
+      layerRenderer.composeFrame(frameState, layerState, context);
+    }
+  }
+
+  this.dispatchComposeEvent_(
+      ol.render.EventType.POSTCOMPOSE, frameState);
+
+  if (!this.renderedVisible_) {
+    goog.style.setElementShown(this.canvas_, true);
+    this.renderedVisible_ = true;
+  }
+
+  this.scheduleRemoveUnusedLayerRenderers(frameState);
+  this.scheduleExpireIconCache(frameState);
+};
+
+goog.provide('ol.renderer.dom.Layer');
+
+goog.require('ol');
+goog.require('ol.layer.Layer');
+goog.require('ol.renderer.Layer');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.renderer.Layer}
+ * @param {ol.layer.Layer} layer Layer.
+ * @param {!Element} target Target.
+ */
+ol.renderer.dom.Layer = function(layer, target) {
+
+  goog.base(this, layer);
+
+  /**
+   * @type {!Element}
+   * @protected
+   */
+  this.target = target;
+
+};
+goog.inherits(ol.renderer.dom.Layer, ol.renderer.Layer);
+
+
+/**
+ * Clear rendered elements.
+ */
+ol.renderer.dom.Layer.prototype.clearFrame = ol.nullFunction;
+
+
+/**
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {ol.layer.LayerState} layerState Layer state.
+ */
+ol.renderer.dom.Layer.prototype.composeFrame = ol.nullFunction;
+
+
+/**
+ * @return {!Element} Target.
+ */
+ol.renderer.dom.Layer.prototype.getTarget = function() {
+  return this.target;
+};
+
+
+/**
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {ol.layer.LayerState} layerState Layer state.
+ * @return {boolean} whether composeFrame should be called.
+ */
+ol.renderer.dom.Layer.prototype.prepareFrame = goog.abstractMethod;
+
+goog.provide('ol.renderer.dom.ImageLayer');
+
+goog.require('goog.asserts');
+goog.require('goog.dom');
+goog.require('goog.vec.Mat4');
+goog.require('ol.ImageBase');
+goog.require('ol.ViewHint');
+goog.require('ol.dom');
+goog.require('ol.extent');
+goog.require('ol.layer.Image');
+goog.require('ol.proj');
+goog.require('ol.renderer.dom.Layer');
+goog.require('ol.vec.Mat4');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.renderer.dom.Layer}
+ * @param {ol.layer.Image} imageLayer Image layer.
+ */
+ol.renderer.dom.ImageLayer = function(imageLayer) {
+  var target = document.createElement('DIV');
+  target.style.position = 'absolute';
+
+  goog.base(this, imageLayer, target);
+
+  /**
+   * The last rendered image.
+   * @private
+   * @type {?ol.ImageBase}
+   */
+  this.image_ = null;
+
+  /**
+   * @private
+   * @type {goog.vec.Mat4.Number}
+   */
+  this.transform_ = goog.vec.Mat4.createNumberIdentity();
+
+};
+goog.inherits(ol.renderer.dom.ImageLayer, ol.renderer.dom.Layer);
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.dom.ImageLayer.prototype.forEachFeatureAtCoordinate =
+    function(coordinate, frameState, callback, thisArg) {
+  var layer = this.getLayer();
+  var source = layer.getSource();
+  var resolution = frameState.viewState.resolution;
+  var rotation = frameState.viewState.rotation;
+  var skippedFeatureUids = frameState.skippedFeatureUids;
+  return source.forEachFeatureAtCoordinate(
+      coordinate, resolution, rotation, skippedFeatureUids,
+      /**
+       * @param {ol.Feature|ol.render.Feature} feature Feature.
+       * @return {?} Callback result.
+       */
+      function(feature) {
+        return callback.call(thisArg, feature, layer);
+      });
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.dom.ImageLayer.prototype.clearFrame = function() {
+  goog.dom.removeChildren(this.target);
+  this.image_ = null;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.dom.ImageLayer.prototype.prepareFrame =
+    function(frameState, layerState) {
+
+  var viewState = frameState.viewState;
+  var viewCenter = viewState.center;
+  var viewResolution = viewState.resolution;
+  var viewRotation = viewState.rotation;
+
+  var image = this.image_;
+  var imageLayer = this.getLayer();
+  goog.asserts.assertInstanceof(imageLayer, ol.layer.Image,
+      'layer is an instance of ol.layer.Image');
+  var imageSource = imageLayer.getSource();
+
+  var hints = frameState.viewHints;
+
+  var renderedExtent = frameState.extent;
+  if (layerState.extent !== undefined) {
+    renderedExtent = ol.extent.getIntersection(
+        renderedExtent, layerState.extent);
+  }
+
+  if (!hints[ol.ViewHint.ANIMATING] && !hints[ol.ViewHint.INTERACTING] &&
+      !ol.extent.isEmpty(renderedExtent)) {
+    var projection = viewState.projection;
+    if (!ol.ENABLE_RASTER_REPROJECTION) {
+      var sourceProjection = imageSource.getProjection();
+      if (sourceProjection) {
+        goog.asserts.assert(ol.proj.equivalent(projection, sourceProjection),
+            'projection and sourceProjection are equivalent');
+        projection = sourceProjection;
+      }
+    }
+    var image_ = imageSource.getImage(renderedExtent, viewResolution,
+        frameState.pixelRatio, projection);
+    if (image_) {
+      var loaded = this.loadImage(image_);
+      if (loaded) {
+        image = image_;
+      }
+    }
+  }
+
+  if (image) {
+    var imageExtent = image.getExtent();
+    var imageResolution = image.getResolution();
+    var transform = goog.vec.Mat4.createNumber();
+    ol.vec.Mat4.makeTransform2D(transform,
+        frameState.size[0] / 2, frameState.size[1] / 2,
+        imageResolution / viewResolution, imageResolution / viewResolution,
+        viewRotation,
+        (imageExtent[0] - viewCenter[0]) / imageResolution,
+        (viewCenter[1] - imageExtent[3]) / imageResolution);
+    if (image != this.image_) {
+      var imageElement = image.getImage(this);
+      // Bootstrap sets the style max-width: 100% for all images, which breaks
+      // prevents the image from being displayed in FireFox.  Workaround by
+      // overriding the max-width style.
+      imageElement.style.maxWidth = 'none';
+      imageElement.style.position = 'absolute';
+      goog.dom.removeChildren(this.target);
+      this.target.appendChild(imageElement);
+      this.image_ = image;
+    }
+    this.setTransform_(transform);
+    this.updateAttributions(frameState.attributions, image.getAttributions());
+    this.updateLogos(frameState, imageSource);
+  }
+
+  return true;
+};
+
+
+/**
+ * @param {goog.vec.Mat4.Number} transform Transform.
+ * @private
+ */
+ol.renderer.dom.ImageLayer.prototype.setTransform_ = function(transform) {
+  if (!ol.vec.Mat4.equals2D(transform, this.transform_)) {
+    ol.dom.transformElement2D(this.target, transform, 6);
+    goog.vec.Mat4.setFromArray(this.transform_, transform);
+  }
+};
+
+// FIXME probably need to reset TileLayerZ if offsets get too large
+// FIXME when zooming out, preserve higher Z divs to avoid white flash
+
+goog.provide('ol.renderer.dom.TileLayer');
+
+goog.require('goog.asserts');
+goog.require('goog.dom');
+goog.require('goog.style');
+goog.require('goog.vec.Mat4');
+goog.require('ol');
+goog.require('ol.Coordinate');
+goog.require('ol.TileCoord');
+goog.require('ol.TileRange');
+goog.require('ol.TileState');
+goog.require('ol.ViewHint');
+goog.require('ol.array');
+goog.require('ol.dom');
+goog.require('ol.extent');
+goog.require('ol.layer.Tile');
+goog.require('ol.renderer.dom.Layer');
+goog.require('ol.size');
+goog.require('ol.tilecoord');
+goog.require('ol.tilegrid.TileGrid');
+goog.require('ol.vec.Mat4');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.renderer.dom.Layer}
+ * @param {ol.layer.Tile} tileLayer Tile layer.
+ */
+ol.renderer.dom.TileLayer = function(tileLayer) {
+
+  var target = document.createElement('DIV');
+  target.style.position = 'absolute';
+
+  goog.base(this, tileLayer, target);
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.renderedVisible_ = true;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.renderedOpacity_ = 1;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.renderedRevision_ = 0;
+
+  /**
+   * @private
+   * @type {!Object.<number, ol.renderer.dom.TileLayerZ_>}
+   */
+  this.tileLayerZs_ = {};
+
+};
+goog.inherits(ol.renderer.dom.TileLayer, ol.renderer.dom.Layer);
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.dom.TileLayer.prototype.clearFrame = function() {
+  goog.dom.removeChildren(this.target);
+  this.renderedRevision_ = 0;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.dom.TileLayer.prototype.prepareFrame =
+    function(frameState, layerState) {
+
+  if (!layerState.visible) {
+    if (this.renderedVisible_) {
+      goog.style.setElementShown(this.target, false);
+      this.renderedVisible_ = false;
+    }
+    return true;
+  }
+
+  var pixelRatio = frameState.pixelRatio;
+  var viewState = frameState.viewState;
+  var projection = viewState.projection;
+
+  var tileLayer = this.getLayer();
+  goog.asserts.assertInstanceof(tileLayer, ol.layer.Tile,
+      'layer is an instance of ol.layer.Tile');
+  var tileSource = tileLayer.getSource();
+  var tileGrid = tileSource.getTileGridForProjection(projection);
+  var tileGutter = tileSource.getGutter();
+  var z = tileGrid.getZForResolution(viewState.resolution);
+  var tileResolution = tileGrid.getResolution(z);
+  var center = viewState.center;
+  var extent;
+  if (tileResolution == viewState.resolution) {
+    center = this.snapCenterToPixel(center, tileResolution, frameState.size);
+    extent = ol.extent.getForViewAndSize(
+        center, tileResolution, viewState.rotation, frameState.size);
+  } else {
+    extent = frameState.extent;
+  }
+
+  if (layerState.extent !== undefined) {
+    extent = ol.extent.getIntersection(extent, layerState.extent);
+  }
+
+  var tileRange = tileGrid.getTileRangeForExtentAndResolution(
+      extent, tileResolution);
+
+  /** @type {Object.<number, Object.<string, ol.Tile>>} */
+  var tilesToDrawByZ = {};
+  tilesToDrawByZ[z] = {};
+
+  var findLoadedTiles = this.createLoadedTileFinder(
+      tileSource, projection, tilesToDrawByZ);
+
+  var useInterimTilesOnError = tileLayer.getUseInterimTilesOnError();
+
+  var tmpExtent = ol.extent.createEmpty();
+  var tmpTileRange = new ol.TileRange(0, 0, 0, 0);
+  var childTileRange, drawable, fullyLoaded, tile, tileState, x, y;
+  for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
+    for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
+      tile = tileSource.getTile(z, x, y, pixelRatio, projection);
+      tileState = tile.getState();
+      drawable = tileState == ol.TileState.LOADED ||
+          tileState == ol.TileState.EMPTY ||
+          tileState == ol.TileState.ERROR && !useInterimTilesOnError;
+      if (!drawable && tile.interimTile) {
+        tile = tile.interimTile;
+      }
+      goog.asserts.assert(tile);
+      tileState = tile.getState();
+      if (tileState == ol.TileState.LOADED) {
+        tilesToDrawByZ[z][ol.tilecoord.toString(tile.tileCoord)] = tile;
+        continue;
+      } else if (tileState == ol.TileState.EMPTY ||
+                 (tileState == ol.TileState.ERROR &&
+                  !useInterimTilesOnError)) {
+        continue;
+      }
+      fullyLoaded = tileGrid.forEachTileCoordParentTileRange(
+          tile.tileCoord, findLoadedTiles, null, tmpTileRange, tmpExtent);
+      if (!fullyLoaded) {
+        childTileRange = tileGrid.getTileCoordChildTileRange(
+            tile.tileCoord, tmpTileRange, tmpExtent);
+        if (childTileRange) {
+          findLoadedTiles(z + 1, childTileRange);
+        }
+      }
+
+    }
+
+  }
+
+  // If the tile source revision changes, we destroy the existing DOM structure
+  // so that a new one will be created.  It would be more efficient to modify
+  // the existing structure.
+  var tileLayerZ, tileLayerZKey;
+  if (this.renderedRevision_ != tileSource.getRevision()) {
+    for (tileLayerZKey in this.tileLayerZs_) {
+      tileLayerZ = this.tileLayerZs_[+tileLayerZKey];
+      goog.dom.removeNode(tileLayerZ.target);
+    }
+    this.tileLayerZs_ = {};
+    this.renderedRevision_ = tileSource.getRevision();
+  }
+
+  /** @type {Array.<number>} */
+  var zs = Object.keys(tilesToDrawByZ).map(Number);
+  zs.sort(ol.array.numberSafeCompareFunction);
+
+  /** @type {Object.<number, boolean>} */
+  var newTileLayerZKeys = {};
+
+  var iz, iziz, tileCoordKey, tileCoordOrigin, tilesToDraw;
+  for (iz = 0, iziz = zs.length; iz < iziz; ++iz) {
+    tileLayerZKey = zs[iz];
+    if (tileLayerZKey in this.tileLayerZs_) {
+      tileLayerZ = this.tileLayerZs_[tileLayerZKey];
+    } else {
+      tileCoordOrigin =
+          tileGrid.getTileCoordForCoordAndZ(center, tileLayerZKey);
+      tileLayerZ = new ol.renderer.dom.TileLayerZ_(tileGrid, tileCoordOrigin);
+      newTileLayerZKeys[tileLayerZKey] = true;
+      this.tileLayerZs_[tileLayerZKey] = tileLayerZ;
+    }
+    tilesToDraw = tilesToDrawByZ[tileLayerZKey];
+    for (tileCoordKey in tilesToDraw) {
+      tileLayerZ.addTile(tilesToDraw[tileCoordKey], tileGutter);
+    }
+    tileLayerZ.finalizeAddTiles();
+  }
+
+  /** @type {Array.<number>} */
+  var tileLayerZKeys = Object.keys(this.tileLayerZs_).map(Number);
+  tileLayerZKeys.sort(ol.array.numberSafeCompareFunction);
+
+  var i, ii, j, origin, resolution;
+  var transform = goog.vec.Mat4.createNumber();
+  for (i = 0, ii = tileLayerZKeys.length; i < ii; ++i) {
+    tileLayerZKey = tileLayerZKeys[i];
+    tileLayerZ = this.tileLayerZs_[tileLayerZKey];
+    if (!(tileLayerZKey in tilesToDrawByZ)) {
+      goog.dom.removeNode(tileLayerZ.target);
+      delete this.tileLayerZs_[tileLayerZKey];
+      continue;
+    }
+    resolution = tileLayerZ.getResolution();
+    origin = tileLayerZ.getOrigin();
+    ol.vec.Mat4.makeTransform2D(transform,
+        frameState.size[0] / 2, frameState.size[1] / 2,
+        resolution / viewState.resolution,
+        resolution / viewState.resolution,
+        viewState.rotation,
+        (origin[0] - center[0]) / resolution,
+        (center[1] - origin[1]) / resolution);
+    tileLayerZ.setTransform(transform);
+    if (tileLayerZKey in newTileLayerZKeys) {
+      for (j = tileLayerZKey - 1; j >= 0; --j) {
+        if (j in this.tileLayerZs_) {
+          goog.dom.insertSiblingAfter(
+              tileLayerZ.target, this.tileLayerZs_[j].target);
+          break;
+        }
+      }
+      if (j < 0) {
+        goog.dom.insertChildAt(this.target, tileLayerZ.target, 0);
+      }
+    } else {
+      if (!frameState.viewHints[ol.ViewHint.ANIMATING] &&
+          !frameState.viewHints[ol.ViewHint.INTERACTING]) {
+        tileLayerZ.removeTilesOutsideExtent(extent, tmpTileRange);
+      }
+    }
+  }
+
+  if (layerState.opacity != this.renderedOpacity_) {
+    this.target.style.opacity = layerState.opacity;
+    this.renderedOpacity_ = layerState.opacity;
+  }
+
+  if (layerState.visible && !this.renderedVisible_) {
+    goog.style.setElementShown(this.target, true);
+    this.renderedVisible_ = true;
+  }
+
+  this.updateUsedTiles(frameState.usedTiles, tileSource, z, tileRange);
+  this.manageTilePyramid(frameState, tileSource, tileGrid, pixelRatio,
+      projection, extent, z, tileLayer.getPreload());
+  this.scheduleExpireCache(frameState, tileSource);
+  this.updateLogos(frameState, tileSource);
+
+  return true;
+};
+
+
+
+/**
+ * @constructor
+ * @private
+ * @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
+ * @param {ol.TileCoord} tileCoordOrigin Tile coord origin.
+ */
+ol.renderer.dom.TileLayerZ_ = function(tileGrid, tileCoordOrigin) {
+
+  /**
+   * @type {!Element}
+   */
+  this.target = document.createElement('DIV');
+  this.target.style.position = 'absolute';
+  this.target.style.width = '100%';
+  this.target.style.height = '100%';
+
+  /**
+   * @private
+   * @type {ol.tilegrid.TileGrid}
+   */
+  this.tileGrid_ = tileGrid;
+
+  /**
+   * @private
+   * @type {ol.TileCoord}
+   */
+  this.tileCoordOrigin_ = tileCoordOrigin;
+
+  /**
+   * @private
+   * @type {ol.Coordinate}
+   */
+  this.origin_ =
+      ol.extent.getTopLeft(tileGrid.getTileCoordExtent(tileCoordOrigin));
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.resolution_ = tileGrid.getResolution(tileCoordOrigin[0]);
+
+  /**
+   * @private
+   * @type {Object.<string, ol.Tile>}
+   */
+  this.tiles_ = {};
+
+  /**
+   * @private
+   * @type {DocumentFragment}
+   */
+  this.documentFragment_ = null;
+
+  /**
+   * @private
+   * @type {goog.vec.Mat4.Number}
+   */
+  this.transform_ = goog.vec.Mat4.createNumberIdentity();
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.tmpSize_ = [0, 0];
+
+};
+
+
+/**
+ * @param {ol.Tile} tile Tile.
+ * @param {number} tileGutter Tile gutter.
+ */
+ol.renderer.dom.TileLayerZ_.prototype.addTile = function(tile, tileGutter) {
+  var tileCoord = tile.tileCoord;
+  var tileCoordZ = tileCoord[0];
+  var tileCoordX = tileCoord[1];
+  var tileCoordY = tileCoord[2];
+  goog.asserts.assert(tileCoordZ == this.tileCoordOrigin_[0],
+      'tileCoordZ matches z of tileCoordOrigin');
+  var tileCoordKey = ol.tilecoord.toString(tileCoord);
+  if (tileCoordKey in this.tiles_) {
+    return;
+  }
+  var tileSize = ol.size.toSize(
+      this.tileGrid_.getTileSize(tileCoordZ), this.tmpSize_);
+  var image = tile.getImage(this);
+  var imageStyle = image.style;
+  // Bootstrap sets the style max-width: 100% for all images, which
+  // prevents the tile from being displayed in FireFox.  Workaround
+  // by overriding the max-width style.
+  imageStyle.maxWidth = 'none';
+  var tileElement;
+  var tileElementStyle;
+  if (tileGutter > 0) {
+    tileElement = document.createElement('DIV');
+    tileElementStyle = tileElement.style;
+    tileElementStyle.overflow = 'hidden';
+    tileElementStyle.width = tileSize[0] + 'px';
+    tileElementStyle.height = tileSize[1] + 'px';
+    imageStyle.position = 'absolute';
+    imageStyle.left = -tileGutter + 'px';
+    imageStyle.top = -tileGutter + 'px';
+    imageStyle.width = (tileSize[0] + 2 * tileGutter) + 'px';
+    imageStyle.height = (tileSize[1] + 2 * tileGutter) + 'px';
+    tileElement.appendChild(image);
+  } else {
+    imageStyle.width = tileSize[0] + 'px';
+    imageStyle.height = tileSize[1] + 'px';
+    tileElement = image;
+    tileElementStyle = imageStyle;
+  }
+  tileElementStyle.position = 'absolute';
+  tileElementStyle.left =
+      ((tileCoordX - this.tileCoordOrigin_[1]) * tileSize[0]) + 'px';
+  tileElementStyle.top =
+      ((this.tileCoordOrigin_[2] - tileCoordY) * tileSize[1]) + 'px';
+  if (!this.documentFragment_) {
+    this.documentFragment_ = document.createDocumentFragment();
+  }
+  this.documentFragment_.appendChild(tileElement);
+  this.tiles_[tileCoordKey] = tile;
+};
+
+
+/**
+ * FIXME empty description for jsdoc
+ */
+ol.renderer.dom.TileLayerZ_.prototype.finalizeAddTiles = function() {
+  if (this.documentFragment_) {
+    this.target.appendChild(this.documentFragment_);
+    this.documentFragment_ = null;
+  }
+};
+
+
+/**
+ * @return {ol.Coordinate} Origin.
+ */
+ol.renderer.dom.TileLayerZ_.prototype.getOrigin = function() {
+  return this.origin_;
+};
+
+
+/**
+ * @return {number} Resolution.
+ */
+ol.renderer.dom.TileLayerZ_.prototype.getResolution = function() {
+  return this.resolution_;
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {ol.TileRange=} opt_tileRange Temporary ol.TileRange object.
+ */
+ol.renderer.dom.TileLayerZ_.prototype.removeTilesOutsideExtent =
+    function(extent, opt_tileRange) {
+  var tileRange = this.tileGrid_.getTileRangeForExtentAndZ(
+      extent, this.tileCoordOrigin_[0], opt_tileRange);
+  /** @type {Array.<ol.Tile>} */
+  var tilesToRemove = [];
+  var tile, tileCoordKey;
+  for (tileCoordKey in this.tiles_) {
+    tile = this.tiles_[tileCoordKey];
+    if (!tileRange.contains(tile.tileCoord)) {
+      tilesToRemove.push(tile);
+    }
+  }
+  var i, ii;
+  for (i = 0, ii = tilesToRemove.length; i < ii; ++i) {
+    tile = tilesToRemove[i];
+    tileCoordKey = ol.tilecoord.toString(tile.tileCoord);
+    goog.dom.removeNode(tile.getImage(this));
+    delete this.tiles_[tileCoordKey];
+  }
+};
+
+
+/**
+ * @param {goog.vec.Mat4.Number} transform Transform.
+ */
+ol.renderer.dom.TileLayerZ_.prototype.setTransform = function(transform) {
+  if (!ol.vec.Mat4.equals2D(transform, this.transform_)) {
+    ol.dom.transformElement2D(this.target, transform, 6);
+    goog.vec.Mat4.setFromArray(this.transform_, transform);
+  }
+};
+
+goog.provide('ol.renderer.dom.VectorLayer');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.vec.Mat4');
+goog.require('ol.ViewHint');
+goog.require('ol.dom');
+goog.require('ol.extent');
+goog.require('ol.layer.Vector');
+goog.require('ol.render.Event');
+goog.require('ol.render.EventType');
+goog.require('ol.render.canvas.Immediate');
+goog.require('ol.render.canvas.ReplayGroup');
+goog.require('ol.renderer.dom.Layer');
+goog.require('ol.renderer.vector');
+goog.require('ol.vec.Mat4');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.renderer.dom.Layer}
+ * @param {ol.layer.Vector} vectorLayer Vector layer.
+ */
+ol.renderer.dom.VectorLayer = function(vectorLayer) {
+
+  /**
+   * @private
+   * @type {CanvasRenderingContext2D}
+   */
+  this.context_ = ol.dom.createCanvasContext2D();
+
+  var target = this.context_.canvas;
+  // Bootstrap sets the style max-width: 100% for all images, which breaks
+  // prevents the image from being displayed in FireFox.  Workaround by
+  // overriding the max-width style.
+  target.style.maxWidth = 'none';
+  target.style.position = 'absolute';
+
+  goog.base(this, vectorLayer, target);
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.dirty_ = false;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.renderedRevision_ = -1;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.renderedResolution_ = NaN;
+
+  /**
+   * @private
+   * @type {ol.Extent}
+   */
+  this.renderedExtent_ = ol.extent.createEmpty();
+
+  /**
+   * @private
+   * @type {function(ol.Feature, ol.Feature): number|null}
+   */
+  this.renderedRenderOrder_ = null;
+
+  /**
+   * @private
+   * @type {ol.render.canvas.ReplayGroup}
+   */
+  this.replayGroup_ = null;
+
+  /**
+   * @private
+   * @type {goog.vec.Mat4.Number}
+   */
+  this.transform_ = goog.vec.Mat4.createNumber();
+
+  /**
+   * @private
+   * @type {goog.vec.Mat4.Number}
+   */
+  this.elementTransform_ = goog.vec.Mat4.createNumber();
+
+};
+goog.inherits(ol.renderer.dom.VectorLayer, ol.renderer.dom.Layer);
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.dom.VectorLayer.prototype.composeFrame =
+    function(frameState, layerState) {
+
+  var vectorLayer = /** @type {ol.layer.Vector} */ (this.getLayer());
+  goog.asserts.assertInstanceof(vectorLayer, ol.layer.Vector,
+      'layer is an instance of ol.layer.Vector');
+
+  var viewState = frameState.viewState;
+  var viewCenter = viewState.center;
+  var viewRotation = viewState.rotation;
+  var viewResolution = viewState.resolution;
+  var pixelRatio = frameState.pixelRatio;
+  var viewWidth = frameState.size[0];
+  var viewHeight = frameState.size[1];
+  var imageWidth = viewWidth * pixelRatio;
+  var imageHeight = viewHeight * pixelRatio;
+
+  var transform = ol.vec.Mat4.makeTransform2D(this.transform_,
+      pixelRatio * viewWidth / 2,
+      pixelRatio * viewHeight / 2,
+      pixelRatio / viewResolution,
+      -pixelRatio / viewResolution,
+      -viewRotation,
+      -viewCenter[0], -viewCenter[1]);
+
+  var context = this.context_;
+
+  // Clear the canvas and set the correct size
+  context.canvas.width = imageWidth;
+  context.canvas.height = imageHeight;
+
+  var elementTransform = ol.vec.Mat4.makeTransform2D(this.elementTransform_,
+      0, 0,
+      1 / pixelRatio, 1 / pixelRatio,
+      0,
+      -(imageWidth - viewWidth) / 2 * pixelRatio,
+      -(imageHeight - viewHeight) / 2 * pixelRatio);
+  ol.dom.transformElement2D(context.canvas, elementTransform, 6);
+
+  this.dispatchEvent_(ol.render.EventType.PRECOMPOSE, frameState, transform);
+
+  var replayGroup = this.replayGroup_;
+
+  if (replayGroup && !replayGroup.isEmpty()) {
+
+    context.globalAlpha = layerState.opacity;
+    replayGroup.replay(context, pixelRatio, transform, viewRotation,
+        layerState.managed ? frameState.skippedFeatureUids : {});
+
+    this.dispatchEvent_(ol.render.EventType.RENDER, frameState, transform);
+  }
+
+  this.dispatchEvent_(ol.render.EventType.POSTCOMPOSE, frameState, transform);
+};
+
+
+/**
+ * @param {ol.render.EventType} type Event type.
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {goog.vec.Mat4.Number} transform Transform.
+ * @private
+ */
+ol.renderer.dom.VectorLayer.prototype.dispatchEvent_ =
+    function(type, frameState, transform) {
+  var context = this.context_;
+  var layer = this.getLayer();
+  if (layer.hasListener(type)) {
+    var render = new ol.render.canvas.Immediate(
+        context, frameState.pixelRatio, frameState.extent, transform,
+        frameState.viewState.rotation);
+    var event = new ol.render.Event(type, layer, render, frameState,
+        context, null);
+    layer.dispatchEvent(event);
+    render.flush();
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.dom.VectorLayer.prototype.forEachFeatureAtCoordinate =
+    function(coordinate, frameState, callback, thisArg) {
+  if (!this.replayGroup_) {
+    return undefined;
+  } else {
+    var resolution = frameState.viewState.resolution;
+    var rotation = frameState.viewState.rotation;
+    var layer = this.getLayer();
+    var layerState = frameState.layerStates[goog.getUid(layer)];
+    /** @type {Object.<string, boolean>} */
+    var features = {};
+    return this.replayGroup_.forEachFeatureAtCoordinate(coordinate, resolution,
+        rotation, layerState.managed ? frameState.skippedFeatureUids : {},
+        /**
+         * @param {ol.Feature|ol.render.Feature} feature Feature.
+         * @return {?} Callback result.
+         */
+        function(feature) {
+          goog.asserts.assert(feature !== undefined, 'received a feature');
+          var key = goog.getUid(feature).toString();
+          if (!(key in features)) {
+            features[key] = true;
+            return callback.call(thisArg, feature, layer);
+          }
+        });
+  }
+};
+
+
+/**
+ * Handle changes in image style state.
+ * @param {goog.events.Event} event Image style change event.
+ * @private
+ */
+ol.renderer.dom.VectorLayer.prototype.handleStyleImageChange_ =
+    function(event) {
+  this.renderIfReadyAndVisible();
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.dom.VectorLayer.prototype.prepareFrame =
+    function(frameState, layerState) {
+
+  var vectorLayer = /** @type {ol.layer.Vector} */ (this.getLayer());
+  goog.asserts.assertInstanceof(vectorLayer, ol.layer.Vector,
+      'layer is an instance of ol.layer.Vector');
+  var vectorSource = vectorLayer.getSource();
+
+  this.updateAttributions(
+      frameState.attributions, vectorSource.getAttributions());
+  this.updateLogos(frameState, vectorSource);
+
+  var animating = frameState.viewHints[ol.ViewHint.ANIMATING];
+  var interacting = frameState.viewHints[ol.ViewHint.INTERACTING];
+  var updateWhileAnimating = vectorLayer.getUpdateWhileAnimating();
+  var updateWhileInteracting = vectorLayer.getUpdateWhileInteracting();
+
+  if (!this.dirty_ && (!updateWhileAnimating && animating) ||
+      (!updateWhileInteracting && interacting)) {
+    return true;
+  }
+
+  var frameStateExtent = frameState.extent;
+  var viewState = frameState.viewState;
+  var projection = viewState.projection;
+  var resolution = viewState.resolution;
+  var pixelRatio = frameState.pixelRatio;
+  var vectorLayerRevision = vectorLayer.getRevision();
+  var vectorLayerRenderBuffer = vectorLayer.getRenderBuffer();
+  var vectorLayerRenderOrder = vectorLayer.getRenderOrder();
+
+  if (vectorLayerRenderOrder === undefined) {
+    vectorLayerRenderOrder = ol.renderer.vector.defaultOrder;
+  }
+
+  var extent = ol.extent.buffer(frameStateExtent,
+      vectorLayerRenderBuffer * resolution);
+
+  if (!this.dirty_ &&
+      this.renderedResolution_ == resolution &&
+      this.renderedRevision_ == vectorLayerRevision &&
+      this.renderedRenderOrder_ == vectorLayerRenderOrder &&
+      ol.extent.containsExtent(this.renderedExtent_, extent)) {
+    return true;
+  }
+
+  // FIXME dispose of old replayGroup in post render
+  goog.dispose(this.replayGroup_);
+  this.replayGroup_ = null;
+
+  this.dirty_ = false;
+
+  var replayGroup =
+      new ol.render.canvas.ReplayGroup(
+          ol.renderer.vector.getTolerance(resolution, pixelRatio), extent,
+          resolution, vectorLayer.getRenderBuffer());
+  vectorSource.loadFeatures(extent, resolution, projection);
+  var renderFeature =
+      /**
+       * @param {ol.Feature} feature Feature.
+       * @this {ol.renderer.dom.VectorLayer}
+       */
+      function(feature) {
+    var styles;
+    var styleFunction = feature.getStyleFunction();
+    if (styleFunction) {
+      styles = styleFunction.call(feature, resolution);
+    } else {
+      styleFunction = vectorLayer.getStyleFunction();
+      if (styleFunction) {
+        styles = styleFunction(feature, resolution);
+      }
+    }
+    if (styles) {
+      var dirty = this.renderFeature(
+          feature, resolution, pixelRatio, styles, replayGroup);
+      this.dirty_ = this.dirty_ || dirty;
+    }
+  };
+  if (vectorLayerRenderOrder) {
+    /** @type {Array.<ol.Feature>} */
+    var features = [];
+    vectorSource.forEachFeatureInExtent(extent,
+        /**
+         * @param {ol.Feature} feature Feature.
+         */
+        function(feature) {
+          features.push(feature);
+        }, this);
+    features.sort(vectorLayerRenderOrder);
+    features.forEach(renderFeature, this);
+  } else {
+    vectorSource.forEachFeatureInExtent(extent, renderFeature, this);
+  }
+  replayGroup.finish();
+
+  this.renderedResolution_ = resolution;
+  this.renderedRevision_ = vectorLayerRevision;
+  this.renderedRenderOrder_ = vectorLayerRenderOrder;
+  this.renderedExtent_ = extent;
+  this.replayGroup_ = replayGroup;
+
+  return true;
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature.
+ * @param {number} resolution Resolution.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {(ol.style.Style|Array.<ol.style.Style>)} styles The style or array of
+ *     styles.
+ * @param {ol.render.canvas.ReplayGroup} replayGroup Replay group.
+ * @return {boolean} `true` if an image is loading.
+ */
+ol.renderer.dom.VectorLayer.prototype.renderFeature =
+    function(feature, resolution, pixelRatio, styles, replayGroup) {
+  if (!styles) {
+    return false;
+  }
+  var loading = false;
+  if (goog.isArray(styles)) {
+    for (var i = 0, ii = styles.length; i < ii; ++i) {
+      loading = ol.renderer.vector.renderFeature(
+          replayGroup, feature, styles[i],
+          ol.renderer.vector.getSquaredTolerance(resolution, pixelRatio),
+          this.handleStyleImageChange_, this) || loading;
+    }
+  } else {
+    loading = ol.renderer.vector.renderFeature(
+        replayGroup, feature, styles,
+        ol.renderer.vector.getSquaredTolerance(resolution, pixelRatio),
+        this.handleStyleImageChange_, this) || loading;
+  }
+  return loading;
+};
+
+goog.provide('ol.renderer.dom.Map');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.dom');
+goog.require('goog.events');
+goog.require('goog.events.Event');
+goog.require('goog.events.EventType');
+goog.require('goog.style');
+goog.require('goog.vec.Mat4');
+goog.require('ol');
+goog.require('ol.RendererType');
+goog.require('ol.css');
+goog.require('ol.dom');
+goog.require('ol.layer.Image');
+goog.require('ol.layer.Layer');
+goog.require('ol.layer.Tile');
+goog.require('ol.layer.Vector');
+goog.require('ol.render.Event');
+goog.require('ol.render.EventType');
+goog.require('ol.render.canvas.Immediate');
+goog.require('ol.renderer.Map');
+goog.require('ol.renderer.dom.ImageLayer');
+goog.require('ol.renderer.dom.Layer');
+goog.require('ol.renderer.dom.TileLayer');
+goog.require('ol.renderer.dom.VectorLayer');
+goog.require('ol.source.State');
+goog.require('ol.vec.Mat4');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.renderer.Map}
+ * @param {Element} container Container.
+ * @param {ol.Map} map Map.
+ */
+ol.renderer.dom.Map = function(container, map) {
+
+  goog.base(this, container, map);
+
+  /**
+   * @private
+   * @type {CanvasRenderingContext2D}
+   */
+  this.context_ = ol.dom.createCanvasContext2D();
+  var canvas = this.context_.canvas;
+  canvas.style.position = 'absolute';
+  canvas.style.width = '100%';
+  canvas.style.height = '100%';
+  canvas.className = ol.css.CLASS_UNSELECTABLE;
+  goog.dom.insertChildAt(container, canvas, 0);
+
+  /**
+   * @private
+   * @type {!goog.vec.Mat4.Number}
+   */
+  this.transform_ = goog.vec.Mat4.createNumber();
+
+  /**
+   * @type {!Element}
+   * @private
+   */
+  this.layersPane_ = document.createElement('DIV');
+  this.layersPane_.className = ol.css.CLASS_UNSELECTABLE;
+  var style = this.layersPane_.style;
+  style.position = 'absolute';
+  style.width = '100%';
+  style.height = '100%';
+
+  // prevent the img context menu on mobile devices
+  goog.events.listen(this.layersPane_, goog.events.EventType.TOUCHSTART,
+      goog.events.Event.preventDefault);
+
+  goog.dom.insertChildAt(container, this.layersPane_, 0);
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.renderedVisible_ = true;
+
+};
+goog.inherits(ol.renderer.dom.Map, ol.renderer.Map);
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.dom.Map.prototype.disposeInternal = function() {
+  goog.dom.removeNode(this.layersPane_);
+  goog.base(this, 'disposeInternal');
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.dom.Map.prototype.createLayerRenderer = function(layer) {
+  var layerRenderer;
+  if (ol.ENABLE_IMAGE && layer instanceof ol.layer.Image) {
+    layerRenderer = new ol.renderer.dom.ImageLayer(layer);
+  } else if (ol.ENABLE_TILE && layer instanceof ol.layer.Tile) {
+    layerRenderer = new ol.renderer.dom.TileLayer(layer);
+  } else if (ol.ENABLE_VECTOR && layer instanceof ol.layer.Vector) {
+    layerRenderer = new ol.renderer.dom.VectorLayer(layer);
+  } else {
+    goog.asserts.fail('unexpected layer configuration');
+    return null;
+  }
+  return layerRenderer;
+};
+
+
+/**
+ * @param {ol.render.EventType} type Event type.
+ * @param {olx.FrameState} frameState Frame state.
+ * @private
+ */
+ol.renderer.dom.Map.prototype.dispatchComposeEvent_ =
+    function(type, frameState) {
+  var map = this.getMap();
+  if (map.hasListener(type)) {
+    var extent = frameState.extent;
+    var pixelRatio = frameState.pixelRatio;
+    var viewState = frameState.viewState;
+    var rotation = viewState.rotation;
+    var context = this.context_;
+    var canvas = context.canvas;
+
+    ol.vec.Mat4.makeTransform2D(this.transform_,
+        canvas.width / 2,
+        canvas.height / 2,
+        pixelRatio / viewState.resolution,
+        -pixelRatio / viewState.resolution,
+        -viewState.rotation,
+        -viewState.center[0], -viewState.center[1]);
+    var vectorContext = new ol.render.canvas.Immediate(context, pixelRatio,
+        extent, this.transform_, rotation);
+    var composeEvent = new ol.render.Event(type, map, vectorContext,
+        frameState, context, null);
+    map.dispatchEvent(composeEvent);
+    vectorContext.flush();
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.dom.Map.prototype.getType = function() {
+  return ol.RendererType.DOM;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.dom.Map.prototype.renderFrame = function(frameState) {
+
+  if (!frameState) {
+    if (this.renderedVisible_) {
+      goog.style.setElementShown(this.layersPane_, false);
+      this.renderedVisible_ = false;
+    }
+    return;
+  }
+
+  var map = this.getMap();
+  if (map.hasListener(ol.render.EventType.PRECOMPOSE) ||
+      map.hasListener(ol.render.EventType.POSTCOMPOSE)) {
+    var canvas = this.context_.canvas;
+    var pixelRatio = frameState.pixelRatio;
+    canvas.width = frameState.size[0] * pixelRatio;
+    canvas.height = frameState.size[1] * pixelRatio;
+  }
+
+  this.dispatchComposeEvent_(ol.render.EventType.PRECOMPOSE, frameState);
+
+  var layerStatesArray = frameState.layerStatesArray;
+  goog.array.stableSort(layerStatesArray, ol.renderer.Map.sortByZIndex);
+
+  var viewResolution = frameState.viewState.resolution;
+  var i, ii, layer, layerRenderer, layerState;
+  for (i = 0, ii = layerStatesArray.length; i < ii; ++i) {
+    layerState = layerStatesArray[i];
+    layer = layerState.layer;
+    layerRenderer = /** @type {ol.renderer.dom.Layer} */ (
+        this.getLayerRenderer(layer));
+    goog.asserts.assertInstanceof(layerRenderer, ol.renderer.dom.Layer,
+        'renderer is an instance of ol.renderer.dom.Layer');
+    goog.dom.insertChildAt(this.layersPane_, layerRenderer.getTarget(), i);
+    if (ol.layer.Layer.visibleAtResolution(layerState, viewResolution) &&
+        layerState.sourceState == ol.source.State.READY) {
+      if (layerRenderer.prepareFrame(frameState, layerState)) {
+        layerRenderer.composeFrame(frameState, layerState);
+      }
+    } else {
+      layerRenderer.clearFrame();
+    }
+  }
+
+  var layerStates = frameState.layerStates;
+  var layerKey;
+  for (layerKey in this.getLayerRenderers()) {
+    if (!(layerKey in layerStates)) {
+      layerRenderer = this.getLayerRendererByKey(layerKey);
+      goog.asserts.assertInstanceof(layerRenderer, ol.renderer.dom.Layer,
+          'renderer is an instance of ol.renderer.dom.Layer');
+      goog.dom.removeNode(layerRenderer.getTarget());
+    }
+  }
+
+  if (!this.renderedVisible_) {
+    goog.style.setElementShown(this.layersPane_, true);
+    this.renderedVisible_ = true;
+  }
+
+  this.calculateMatrices2D(frameState);
+  this.scheduleRemoveUnusedLayerRenderers(frameState);
+  this.scheduleExpireIconCache(frameState);
+
+  this.dispatchComposeEvent_(ol.render.EventType.POSTCOMPOSE, frameState);
+};
+
+// Copyright 2011 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+/**
+ * @fileoverview Constants used by the WebGL rendering, including all of the
+ * constants used from the WebGL context.  For example, instead of using
+ * context.ARRAY_BUFFER, your code can use
+ * goog.webgl.ARRAY_BUFFER. The benefits for doing this include allowing
+ * the compiler to optimize your code so that the compiled code does not have to
+ * contain large strings to reference these properties, and reducing runtime
+ * property access.
+ *
+ * Values are taken from the WebGL Spec:
+ * https://www.khronos.org/registry/webgl/specs/1.0/#WEBGLRENDERINGCONTEXT
+ */
+
+goog.provide('goog.webgl');
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DEPTH_BUFFER_BIT = 0x00000100;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_BUFFER_BIT = 0x00000400;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.COLOR_BUFFER_BIT = 0x00004000;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.POINTS = 0x0000;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.LINES = 0x0001;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.LINE_LOOP = 0x0002;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.LINE_STRIP = 0x0003;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TRIANGLES = 0x0004;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TRIANGLE_STRIP = 0x0005;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TRIANGLE_FAN = 0x0006;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ZERO = 0;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ONE = 1;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.SRC_COLOR = 0x0300;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ONE_MINUS_SRC_COLOR = 0x0301;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.SRC_ALPHA = 0x0302;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ONE_MINUS_SRC_ALPHA = 0x0303;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DST_ALPHA = 0x0304;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ONE_MINUS_DST_ALPHA = 0x0305;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DST_COLOR = 0x0306;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ONE_MINUS_DST_COLOR = 0x0307;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.SRC_ALPHA_SATURATE = 0x0308;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FUNC_ADD = 0x8006;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BLEND_EQUATION = 0x8009;
+
+
+/**
+ * Same as BLEND_EQUATION
+ * @const
+ * @type {number}
+ */
+goog.webgl.BLEND_EQUATION_RGB = 0x8009;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BLEND_EQUATION_ALPHA = 0x883D;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FUNC_SUBTRACT = 0x800A;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FUNC_REVERSE_SUBTRACT = 0x800B;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BLEND_DST_RGB = 0x80C8;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BLEND_SRC_RGB = 0x80C9;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BLEND_DST_ALPHA = 0x80CA;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BLEND_SRC_ALPHA = 0x80CB;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.CONSTANT_COLOR = 0x8001;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ONE_MINUS_CONSTANT_COLOR = 0x8002;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.CONSTANT_ALPHA = 0x8003;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ONE_MINUS_CONSTANT_ALPHA = 0x8004;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BLEND_COLOR = 0x8005;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ARRAY_BUFFER = 0x8892;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ELEMENT_ARRAY_BUFFER = 0x8893;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ARRAY_BUFFER_BINDING = 0x8894;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ELEMENT_ARRAY_BUFFER_BINDING = 0x8895;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STREAM_DRAW = 0x88E0;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STATIC_DRAW = 0x88E4;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DYNAMIC_DRAW = 0x88E8;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BUFFER_SIZE = 0x8764;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BUFFER_USAGE = 0x8765;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.CURRENT_VERTEX_ATTRIB = 0x8626;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FRONT = 0x0404;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BACK = 0x0405;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FRONT_AND_BACK = 0x0408;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.CULL_FACE = 0x0B44;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BLEND = 0x0BE2;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DITHER = 0x0BD0;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_TEST = 0x0B90;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DEPTH_TEST = 0x0B71;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.SCISSOR_TEST = 0x0C11;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.POLYGON_OFFSET_FILL = 0x8037;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.SAMPLE_ALPHA_TO_COVERAGE = 0x809E;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.SAMPLE_COVERAGE = 0x80A0;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.NO_ERROR = 0;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.INVALID_ENUM = 0x0500;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.INVALID_VALUE = 0x0501;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.INVALID_OPERATION = 0x0502;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.OUT_OF_MEMORY = 0x0505;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.CW = 0x0900;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.CCW = 0x0901;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.LINE_WIDTH = 0x0B21;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ALIASED_POINT_SIZE_RANGE = 0x846D;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ALIASED_LINE_WIDTH_RANGE = 0x846E;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.CULL_FACE_MODE = 0x0B45;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FRONT_FACE = 0x0B46;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DEPTH_RANGE = 0x0B70;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DEPTH_WRITEMASK = 0x0B72;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DEPTH_CLEAR_VALUE = 0x0B73;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DEPTH_FUNC = 0x0B74;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_CLEAR_VALUE = 0x0B91;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_FUNC = 0x0B92;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_FAIL = 0x0B94;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_PASS_DEPTH_FAIL = 0x0B95;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_PASS_DEPTH_PASS = 0x0B96;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_REF = 0x0B97;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_VALUE_MASK = 0x0B93;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_WRITEMASK = 0x0B98;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_BACK_FUNC = 0x8800;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_BACK_FAIL = 0x8801;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_BACK_PASS_DEPTH_FAIL = 0x8802;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_BACK_PASS_DEPTH_PASS = 0x8803;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_BACK_REF = 0x8CA3;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_BACK_VALUE_MASK = 0x8CA4;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_BACK_WRITEMASK = 0x8CA5;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.VIEWPORT = 0x0BA2;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.SCISSOR_BOX = 0x0C10;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.COLOR_CLEAR_VALUE = 0x0C22;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.COLOR_WRITEMASK = 0x0C23;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.UNPACK_ALIGNMENT = 0x0CF5;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.PACK_ALIGNMENT = 0x0D05;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.MAX_TEXTURE_SIZE = 0x0D33;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.MAX_VIEWPORT_DIMS = 0x0D3A;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.SUBPIXEL_BITS = 0x0D50;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RED_BITS = 0x0D52;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.GREEN_BITS = 0x0D53;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BLUE_BITS = 0x0D54;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ALPHA_BITS = 0x0D55;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DEPTH_BITS = 0x0D56;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_BITS = 0x0D57;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.POLYGON_OFFSET_UNITS = 0x2A00;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.POLYGON_OFFSET_FACTOR = 0x8038;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE_BINDING_2D = 0x8069;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.SAMPLE_BUFFERS = 0x80A8;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.SAMPLES = 0x80A9;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.SAMPLE_COVERAGE_VALUE = 0x80AA;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.SAMPLE_COVERAGE_INVERT = 0x80AB;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.COMPRESSED_TEXTURE_FORMATS = 0x86A3;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DONT_CARE = 0x1100;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FASTEST = 0x1101;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.NICEST = 0x1102;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.GENERATE_MIPMAP_HINT = 0x8192;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BYTE = 0x1400;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.UNSIGNED_BYTE = 0x1401;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.SHORT = 0x1402;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.UNSIGNED_SHORT = 0x1403;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.INT = 0x1404;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.UNSIGNED_INT = 0x1405;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FLOAT = 0x1406;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DEPTH_COMPONENT = 0x1902;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ALPHA = 0x1906;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RGB = 0x1907;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RGBA = 0x1908;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.LUMINANCE = 0x1909;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.LUMINANCE_ALPHA = 0x190A;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.UNSIGNED_SHORT_4_4_4_4 = 0x8033;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.UNSIGNED_SHORT_5_5_5_1 = 0x8034;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.UNSIGNED_SHORT_5_6_5 = 0x8363;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FRAGMENT_SHADER = 0x8B30;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.VERTEX_SHADER = 0x8B31;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.MAX_VERTEX_ATTRIBS = 0x8869;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.MAX_VERTEX_UNIFORM_VECTORS = 0x8DFB;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.MAX_VARYING_VECTORS = 0x8DFC;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.MAX_COMBINED_TEXTURE_IMAGE_UNITS = 0x8B4D;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.MAX_VERTEX_TEXTURE_IMAGE_UNITS = 0x8B4C;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.MAX_TEXTURE_IMAGE_UNITS = 0x8872;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.MAX_FRAGMENT_UNIFORM_VECTORS = 0x8DFD;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.SHADER_TYPE = 0x8B4F;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DELETE_STATUS = 0x8B80;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.LINK_STATUS = 0x8B82;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.VALIDATE_STATUS = 0x8B83;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ATTACHED_SHADERS = 0x8B85;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ACTIVE_UNIFORMS = 0x8B86;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ACTIVE_ATTRIBUTES = 0x8B89;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.SHADING_LANGUAGE_VERSION = 0x8B8C;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.CURRENT_PROGRAM = 0x8B8D;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.NEVER = 0x0200;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.LESS = 0x0201;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.EQUAL = 0x0202;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.LEQUAL = 0x0203;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.GREATER = 0x0204;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.NOTEQUAL = 0x0205;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.GEQUAL = 0x0206;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ALWAYS = 0x0207;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.KEEP = 0x1E00;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.REPLACE = 0x1E01;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.INCR = 0x1E02;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DECR = 0x1E03;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.INVERT = 0x150A;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.INCR_WRAP = 0x8507;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DECR_WRAP = 0x8508;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.VENDOR = 0x1F00;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RENDERER = 0x1F01;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.VERSION = 0x1F02;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.NEAREST = 0x2600;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.LINEAR = 0x2601;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.NEAREST_MIPMAP_NEAREST = 0x2700;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.LINEAR_MIPMAP_NEAREST = 0x2701;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.NEAREST_MIPMAP_LINEAR = 0x2702;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.LINEAR_MIPMAP_LINEAR = 0x2703;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE_MAG_FILTER = 0x2800;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE_MIN_FILTER = 0x2801;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE_WRAP_S = 0x2802;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE_WRAP_T = 0x2803;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE_2D = 0x0DE1;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE = 0x1702;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE_CUBE_MAP = 0x8513;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE_BINDING_CUBE_MAP = 0x8514;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE_CUBE_MAP_POSITIVE_X = 0x8515;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE_CUBE_MAP_NEGATIVE_X = 0x8516;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE_CUBE_MAP_POSITIVE_Y = 0x8517;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE_CUBE_MAP_NEGATIVE_Y = 0x8518;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE_CUBE_MAP_POSITIVE_Z = 0x8519;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE_CUBE_MAP_NEGATIVE_Z = 0x851A;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.MAX_CUBE_MAP_TEXTURE_SIZE = 0x851C;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE0 = 0x84C0;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE1 = 0x84C1;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE2 = 0x84C2;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE3 = 0x84C3;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE4 = 0x84C4;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE5 = 0x84C5;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE6 = 0x84C6;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE7 = 0x84C7;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE8 = 0x84C8;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE9 = 0x84C9;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE10 = 0x84CA;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE11 = 0x84CB;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE12 = 0x84CC;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE13 = 0x84CD;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE14 = 0x84CE;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE15 = 0x84CF;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE16 = 0x84D0;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE17 = 0x84D1;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE18 = 0x84D2;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE19 = 0x84D3;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE20 = 0x84D4;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE21 = 0x84D5;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE22 = 0x84D6;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE23 = 0x84D7;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE24 = 0x84D8;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE25 = 0x84D9;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE26 = 0x84DA;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE27 = 0x84DB;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE28 = 0x84DC;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE29 = 0x84DD;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE30 = 0x84DE;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE31 = 0x84DF;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.ACTIVE_TEXTURE = 0x84E0;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.REPEAT = 0x2901;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.CLAMP_TO_EDGE = 0x812F;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.MIRRORED_REPEAT = 0x8370;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FLOAT_VEC2 = 0x8B50;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FLOAT_VEC3 = 0x8B51;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FLOAT_VEC4 = 0x8B52;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.INT_VEC2 = 0x8B53;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.INT_VEC3 = 0x8B54;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.INT_VEC4 = 0x8B55;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BOOL = 0x8B56;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BOOL_VEC2 = 0x8B57;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BOOL_VEC3 = 0x8B58;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BOOL_VEC4 = 0x8B59;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FLOAT_MAT2 = 0x8B5A;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FLOAT_MAT3 = 0x8B5B;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FLOAT_MAT4 = 0x8B5C;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.SAMPLER_2D = 0x8B5E;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.SAMPLER_CUBE = 0x8B60;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.VERTEX_ATTRIB_ARRAY_ENABLED = 0x8622;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.VERTEX_ATTRIB_ARRAY_SIZE = 0x8623;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.VERTEX_ATTRIB_ARRAY_STRIDE = 0x8624;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.VERTEX_ATTRIB_ARRAY_TYPE = 0x8625;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.VERTEX_ATTRIB_ARRAY_NORMALIZED = 0x886A;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.VERTEX_ATTRIB_ARRAY_POINTER = 0x8645;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.VERTEX_ATTRIB_ARRAY_BUFFER_BINDING = 0x889F;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.COMPILE_STATUS = 0x8B81;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.LOW_FLOAT = 0x8DF0;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.MEDIUM_FLOAT = 0x8DF1;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.HIGH_FLOAT = 0x8DF2;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.LOW_INT = 0x8DF3;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.MEDIUM_INT = 0x8DF4;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.HIGH_INT = 0x8DF5;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FRAMEBUFFER = 0x8D40;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RENDERBUFFER = 0x8D41;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RGBA4 = 0x8056;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RGB5_A1 = 0x8057;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RGB565 = 0x8D62;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DEPTH_COMPONENT16 = 0x81A5;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_INDEX = 0x1901;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_INDEX8 = 0x8D48;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DEPTH_STENCIL = 0x84F9;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RENDERBUFFER_WIDTH = 0x8D42;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RENDERBUFFER_HEIGHT = 0x8D43;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RENDERBUFFER_INTERNAL_FORMAT = 0x8D44;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RENDERBUFFER_RED_SIZE = 0x8D50;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RENDERBUFFER_GREEN_SIZE = 0x8D51;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RENDERBUFFER_BLUE_SIZE = 0x8D52;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RENDERBUFFER_ALPHA_SIZE = 0x8D53;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RENDERBUFFER_DEPTH_SIZE = 0x8D54;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RENDERBUFFER_STENCIL_SIZE = 0x8D55;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = 0x8CD0;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FRAMEBUFFER_ATTACHMENT_OBJECT_NAME = 0x8CD1;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL = 0x8CD2;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE = 0x8CD3;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.COLOR_ATTACHMENT0 = 0x8CE0;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DEPTH_ATTACHMENT = 0x8D00;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.STENCIL_ATTACHMENT = 0x8D20;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.DEPTH_STENCIL_ATTACHMENT = 0x821A;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.NONE = 0;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FRAMEBUFFER_COMPLETE = 0x8CD5;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FRAMEBUFFER_INCOMPLETE_ATTACHMENT = 0x8CD6;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT = 0x8CD7;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FRAMEBUFFER_INCOMPLETE_DIMENSIONS = 0x8CD9;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FRAMEBUFFER_UNSUPPORTED = 0x8CDD;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.FRAMEBUFFER_BINDING = 0x8CA6;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.RENDERBUFFER_BINDING = 0x8CA7;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.MAX_RENDERBUFFER_SIZE = 0x84E8;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.INVALID_FRAMEBUFFER_OPERATION = 0x0506;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.UNPACK_FLIP_Y_WEBGL = 0x9240;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.UNPACK_PREMULTIPLY_ALPHA_WEBGL = 0x9241;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.CONTEXT_LOST_WEBGL = 0x9242;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.UNPACK_COLORSPACE_CONVERSION_WEBGL = 0x9243;
+
+
+/**
+ * @const
+ * @type {number}
+ */
+goog.webgl.BROWSER_DEFAULT_WEBGL = 0x9244;
+
+
+/**
+ * From the OES_texture_half_float extension.
+ * http://www.khronos.org/registry/webgl/extensions/OES_texture_half_float/
+ * @const
+ * @type {number}
+ */
+goog.webgl.HALF_FLOAT_OES = 0x8D61;
+
+
+/**
+ * From the OES_standard_derivatives extension.
+ * http://www.khronos.org/registry/webgl/extensions/OES_standard_derivatives/
+ * @const
+ * @type {number}
+ */
+goog.webgl.FRAGMENT_SHADER_DERIVATIVE_HINT_OES = 0x8B8B;
+
+
+/**
+ * From the OES_vertex_array_object extension.
+ * http://www.khronos.org/registry/webgl/extensions/OES_vertex_array_object/
+ * @const
+ * @type {number}
+ */
+goog.webgl.VERTEX_ARRAY_BINDING_OES = 0x85B5;
+
+
+/**
+ * From the WEBGL_debug_renderer_info extension.
+ * http://www.khronos.org/registry/webgl/extensions/WEBGL_debug_renderer_info/
+ * @const
+ * @type {number}
+ */
+goog.webgl.UNMASKED_VENDOR_WEBGL = 0x9245;
+
+
+/**
+ * From the WEBGL_debug_renderer_info extension.
+ * http://www.khronos.org/registry/webgl/extensions/WEBGL_debug_renderer_info/
+ * @const
+ * @type {number}
+ */
+goog.webgl.UNMASKED_RENDERER_WEBGL = 0x9246;
+
+
+/**
+ * From the WEBGL_compressed_texture_s3tc extension.
+ * http://www.khronos.org/registry/webgl/extensions/WEBGL_compressed_texture_s3tc/
+ * @const
+ * @type {number}
+ */
+goog.webgl.COMPRESSED_RGB_S3TC_DXT1_EXT = 0x83F0;
+
+
+/**
+ * From the WEBGL_compressed_texture_s3tc extension.
+ * http://www.khronos.org/registry/webgl/extensions/WEBGL_compressed_texture_s3tc/
+ * @const
+ * @type {number}
+ */
+goog.webgl.COMPRESSED_RGBA_S3TC_DXT1_EXT = 0x83F1;
+
+
+/**
+ * From the WEBGL_compressed_texture_s3tc extension.
+ * http://www.khronos.org/registry/webgl/extensions/WEBGL_compressed_texture_s3tc/
+ * @const
+ * @type {number}
+ */
+goog.webgl.COMPRESSED_RGBA_S3TC_DXT3_EXT = 0x83F2;
+
+
+/**
+ * From the WEBGL_compressed_texture_s3tc extension.
+ * http://www.khronos.org/registry/webgl/extensions/WEBGL_compressed_texture_s3tc/
+ * @const
+ * @type {number}
+ */
+goog.webgl.COMPRESSED_RGBA_S3TC_DXT5_EXT = 0x83F3;
+
+
+/**
+ * From the EXT_texture_filter_anisotropic extension.
+ * http://www.khronos.org/registry/webgl/extensions/EXT_texture_filter_anisotropic/
+ * @const
+ * @type {number}
+ */
+goog.webgl.TEXTURE_MAX_ANISOTROPY_EXT = 0x84FE;
+
+
+/**
+ * From the EXT_texture_filter_anisotropic extension.
+ * http://www.khronos.org/registry/webgl/extensions/EXT_texture_filter_anisotropic/
+ * @const
+ * @type {number}
+ */
+goog.webgl.MAX_TEXTURE_MAX_ANISOTROPY_EXT = 0x84FF;
+
+goog.provide('ol.webgl.Fragment');
+goog.provide('ol.webgl.Shader');
+goog.provide('ol.webgl.Vertex');
+goog.provide('ol.webgl.shader');
+
+goog.require('goog.functions');
+goog.require('goog.webgl');
+goog.require('ol.webgl');
+
+
+
+/**
+ * @constructor
+ * @param {string} source Source.
+ * @struct
+ */
+ol.webgl.Shader = function(source) {
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.source_ = source;
+
+};
+
+
+/**
+ * @return {number} Type.
+ */
+ol.webgl.Shader.prototype.getType = goog.abstractMethod;
+
+
+/**
+ * @return {string} Source.
+ */
+ol.webgl.Shader.prototype.getSource = function() {
+  return this.source_;
+};
+
+
+/**
+ * @return {boolean} Is animated?
+ */
+ol.webgl.Shader.prototype.isAnimated = goog.functions.FALSE;
+
+
+
+/**
+ * @constructor
+ * @extends {ol.webgl.Shader}
+ * @param {string} source Source.
+ * @struct
+ */
+ol.webgl.shader.Fragment = function(source) {
+  goog.base(this, source);
+};
+goog.inherits(ol.webgl.shader.Fragment, ol.webgl.Shader);
+
+
+/**
+ * @inheritDoc
+ */
+ol.webgl.shader.Fragment.prototype.getType = function() {
+  return goog.webgl.FRAGMENT_SHADER;
+};
+
+
+
+/**
+ * @constructor
+ * @extends {ol.webgl.Shader}
+ * @param {string} source Source.
+ * @struct
+ */
+ol.webgl.shader.Vertex = function(source) {
+  goog.base(this, source);
+};
+goog.inherits(ol.webgl.shader.Vertex, ol.webgl.Shader);
+
+
+/**
+ * @inheritDoc
+ */
+ol.webgl.shader.Vertex.prototype.getType = function() {
+  return goog.webgl.VERTEX_SHADER;
+};
+
+// This file is automatically generated, do not edit
+goog.provide('ol.render.webgl.imagereplay.shader.Default');
+goog.provide('ol.render.webgl.imagereplay.shader.Default.Locations');
+goog.provide('ol.render.webgl.imagereplay.shader.DefaultFragment');
+goog.provide('ol.render.webgl.imagereplay.shader.DefaultVertex');
+
+goog.require('ol.webgl.shader');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.webgl.shader.Fragment}
+ * @struct
+ */
+ol.render.webgl.imagereplay.shader.DefaultFragment = function() {
+  goog.base(this, ol.render.webgl.imagereplay.shader.DefaultFragment.SOURCE);
+};
+goog.inherits(ol.render.webgl.imagereplay.shader.DefaultFragment, ol.webgl.shader.Fragment);
+goog.addSingletonGetter(ol.render.webgl.imagereplay.shader.DefaultFragment);
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.render.webgl.imagereplay.shader.DefaultFragment.DEBUG_SOURCE = 'precision mediump float;\nvarying vec2 v_texCoord;\nvarying float v_opacity;\n\nuniform float u_opacity;\nuniform sampler2D u_image;\n\nvoid main(void) {\n  vec4 texColor = texture2D(u_image, v_texCoord);\n  gl_FragColor.rgb = texColor.rgb;\n  float alpha = texColor.a * v_opacity * u_opacity;\n  if (alpha == 0.0) {\n    discard;\n  }\n  gl_FragColor.a = alpha;\n}\n';
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.render.webgl.imagereplay.shader.DefaultFragment.OPTIMIZED_SOURCE = 'precision mediump float;varying vec2 a;varying float b;uniform float k;uniform sampler2D l;void main(void){vec4 texColor=texture2D(l,a);gl_FragColor.rgb=texColor.rgb;float alpha=texColor.a*b*k;if(alpha==0.0){discard;}gl_FragColor.a=alpha;}';
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.render.webgl.imagereplay.shader.DefaultFragment.SOURCE = goog.DEBUG ?
+    ol.render.webgl.imagereplay.shader.DefaultFragment.DEBUG_SOURCE :
+    ol.render.webgl.imagereplay.shader.DefaultFragment.OPTIMIZED_SOURCE;
+
+
+
+/**
+ * @constructor
+ * @extends {ol.webgl.shader.Vertex}
+ * @struct
+ */
+ol.render.webgl.imagereplay.shader.DefaultVertex = function() {
+  goog.base(this, ol.render.webgl.imagereplay.shader.DefaultVertex.SOURCE);
+};
+goog.inherits(ol.render.webgl.imagereplay.shader.DefaultVertex, ol.webgl.shader.Vertex);
+goog.addSingletonGetter(ol.render.webgl.imagereplay.shader.DefaultVertex);
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.render.webgl.imagereplay.shader.DefaultVertex.DEBUG_SOURCE = 'varying vec2 v_texCoord;\nvarying float v_opacity;\n\nattribute vec2 a_position;\nattribute vec2 a_texCoord;\nattribute vec2 a_offsets;\nattribute float a_opacity;\nattribute float a_rotateWithView;\n\nuniform mat4 u_projectionMatrix;\nuniform mat4 u_offsetScaleMatrix;\nuniform mat4 u_offsetRotateMatrix;\n\nvoid main(void) {\n  mat4 offsetMatrix = u_offsetScaleMatrix;\n  if (a_rotateWithView == 1.0) {\n    offsetMatrix = u_offsetScaleMatrix * u_offsetRotateMatrix;\n  }\n  vec4 offsets = offsetMatrix * vec4(a_offsets, 0., 0.);\n  gl_Position = u_projectionMatrix * vec4(a_position, 0., 1.) + offsets;\n  v_texCoord = a_texCoord;\n  v_opacity = a_opacity;\n}\n\n\n';
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.render.webgl.imagereplay.shader.DefaultVertex.OPTIMIZED_SOURCE = 'varying vec2 a;varying float b;attribute vec2 c;attribute vec2 d;attribute vec2 e;attribute float f;attribute float g;uniform mat4 h;uniform mat4 i;uniform mat4 j;void main(void){mat4 offsetMatrix=i;if(g==1.0){offsetMatrix=i*j;}vec4 offsets=offsetMatrix*vec4(e,0.,0.);gl_Position=h*vec4(c,0.,1.)+offsets;a=d;b=f;}';
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.render.webgl.imagereplay.shader.DefaultVertex.SOURCE = goog.DEBUG ?
+    ol.render.webgl.imagereplay.shader.DefaultVertex.DEBUG_SOURCE :
+    ol.render.webgl.imagereplay.shader.DefaultVertex.OPTIMIZED_SOURCE;
+
+
+
+/**
+ * @constructor
+ * @param {WebGLRenderingContext} gl GL.
+ * @param {WebGLProgram} program Program.
+ * @struct
+ */
+ol.render.webgl.imagereplay.shader.Default.Locations = function(gl, program) {
+
+  /**
+   * @type {WebGLUniformLocation}
+   */
+  this.u_image = gl.getUniformLocation(
+      program, goog.DEBUG ? 'u_image' : 'l');
+
+  /**
+   * @type {WebGLUniformLocation}
+   */
+  this.u_offsetRotateMatrix = gl.getUniformLocation(
+      program, goog.DEBUG ? 'u_offsetRotateMatrix' : 'j');
+
+  /**
+   * @type {WebGLUniformLocation}
+   */
+  this.u_offsetScaleMatrix = gl.getUniformLocation(
+      program, goog.DEBUG ? 'u_offsetScaleMatrix' : 'i');
+
+  /**
+   * @type {WebGLUniformLocation}
+   */
+  this.u_opacity = gl.getUniformLocation(
+      program, goog.DEBUG ? 'u_opacity' : 'k');
+
+  /**
+   * @type {WebGLUniformLocation}
+   */
+  this.u_projectionMatrix = gl.getUniformLocation(
+      program, goog.DEBUG ? 'u_projectionMatrix' : 'h');
+
+  /**
+   * @type {number}
+   */
+  this.a_offsets = gl.getAttribLocation(
+      program, goog.DEBUG ? 'a_offsets' : 'e');
+
+  /**
+   * @type {number}
+   */
+  this.a_opacity = gl.getAttribLocation(
+      program, goog.DEBUG ? 'a_opacity' : 'f');
+
+  /**
+   * @type {number}
+   */
+  this.a_position = gl.getAttribLocation(
+      program, goog.DEBUG ? 'a_position' : 'c');
+
+  /**
+   * @type {number}
+   */
+  this.a_rotateWithView = gl.getAttribLocation(
+      program, goog.DEBUG ? 'a_rotateWithView' : 'g');
+
+  /**
+   * @type {number}
+   */
+  this.a_texCoord = gl.getAttribLocation(
+      program, goog.DEBUG ? 'a_texCoord' : 'd');
+};
+
+goog.provide('ol.webgl.Buffer');
+
+goog.require('goog.webgl');
+goog.require('ol');
+
+
+/**
+ * @enum {number}
+ */
+ol.webgl.BufferUsage = {
+  STATIC_DRAW: goog.webgl.STATIC_DRAW,
+  STREAM_DRAW: goog.webgl.STREAM_DRAW,
+  DYNAMIC_DRAW: goog.webgl.DYNAMIC_DRAW
+};
+
+
+
+/**
+ * @constructor
+ * @param {Array.<number>=} opt_arr Array.
+ * @param {number=} opt_usage Usage.
+ * @struct
+ */
+ol.webgl.Buffer = function(opt_arr, opt_usage) {
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.arr_ = opt_arr !== undefined ? opt_arr : [];
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.usage_ = opt_usage !== undefined ?
+      opt_usage : ol.webgl.BufferUsage.STATIC_DRAW;
+
+};
+
+
+/**
+ * @return {Array.<number>} Array.
+ */
+ol.webgl.Buffer.prototype.getArray = function() {
+  return this.arr_;
+};
+
+
+/**
+ * @return {number} Usage.
+ */
+ol.webgl.Buffer.prototype.getUsage = function() {
+  return this.usage_;
+};
+
+goog.provide('ol.webgl.Context');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.log');
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.array');
+goog.require('ol.webgl.Buffer');
+goog.require('ol.webgl.WebGLContextEventType');
+
+
+/**
+ * @typedef {{buf: ol.webgl.Buffer,
+ *            buffer: WebGLBuffer}}
+ */
+ol.webgl.BufferCacheEntry;
+
+
+
+/**
+ * @classdesc
+ * A WebGL context for accessing low-level WebGL capabilities.
+ *
+ * @constructor
+ * @extends {goog.events.EventTarget}
+ * @param {HTMLCanvasElement} canvas Canvas.
+ * @param {WebGLRenderingContext} gl GL.
+ */
+ol.webgl.Context = function(canvas, gl) {
+
+  /**
+   * @private
+   * @type {HTMLCanvasElement}
+   */
+  this.canvas_ = canvas;
+
+  /**
+   * @private
+   * @type {WebGLRenderingContext}
+   */
+  this.gl_ = gl;
+
+  /**
+   * @private
+   * @type {Object.<number, ol.webgl.BufferCacheEntry>}
+   */
+  this.bufferCache_ = {};
+
+  /**
+   * @private
+   * @type {Object.<number, WebGLShader>}
+   */
+  this.shaderCache_ = {};
+
+  /**
+   * @private
+   * @type {Object.<string, WebGLProgram>}
+   */
+  this.programCache_ = {};
+
+  /**
+   * @private
+   * @type {WebGLProgram}
+   */
+  this.currentProgram_ = null;
+
+  /**
+   * @private
+   * @type {WebGLFramebuffer}
+   */
+  this.hitDetectionFramebuffer_ = null;
+
+  /**
+   * @private
+   * @type {WebGLTexture}
+   */
+  this.hitDetectionTexture_ = null;
+
+  /**
+   * @private
+   * @type {WebGLRenderbuffer}
+   */
+  this.hitDetectionRenderbuffer_ = null;
+
+  /**
+   * @type {boolean}
+   */
+  this.hasOESElementIndexUint = ol.array.includes(
+      ol.WEBGL_EXTENSIONS, 'OES_element_index_uint');
+
+  // use the OES_element_index_uint extension if available
+  if (this.hasOESElementIndexUint) {
+    var ext = gl.getExtension('OES_element_index_uint');
+    goog.asserts.assert(ext,
+        'Failed to get extension "OES_element_index_uint"');
+  }
+
+  goog.events.listen(this.canvas_, ol.webgl.WebGLContextEventType.LOST,
+      this.handleWebGLContextLost, false, this);
+  goog.events.listen(this.canvas_, ol.webgl.WebGLContextEventType.RESTORED,
+      this.handleWebGLContextRestored, false, this);
+
+};
+
+
+/**
+ * Just bind the buffer if it's in the cache. Otherwise create
+ * the WebGL buffer, bind it, populate it, and add an entry to
+ * the cache.
+ * @param {number} target Target.
+ * @param {ol.webgl.Buffer} buf Buffer.
+ */
+ol.webgl.Context.prototype.bindBuffer = function(target, buf) {
+  var gl = this.getGL();
+  var arr = buf.getArray();
+  var bufferKey = goog.getUid(buf);
+  if (bufferKey in this.bufferCache_) {
+    var bufferCacheEntry = this.bufferCache_[bufferKey];
+    gl.bindBuffer(target, bufferCacheEntry.buffer);
+  } else {
+    var buffer = gl.createBuffer();
+    gl.bindBuffer(target, buffer);
+    goog.asserts.assert(target == goog.webgl.ARRAY_BUFFER ||
+        target == goog.webgl.ELEMENT_ARRAY_BUFFER,
+        'target is supposed to be an ARRAY_BUFFER or ELEMENT_ARRAY_BUFFER');
+    var /** @type {ArrayBufferView} */ arrayBuffer;
+    if (target == goog.webgl.ARRAY_BUFFER) {
+      arrayBuffer = new Float32Array(arr);
+    } else if (target == goog.webgl.ELEMENT_ARRAY_BUFFER) {
+      arrayBuffer = this.hasOESElementIndexUint ?
+          new Uint32Array(arr) : new Uint16Array(arr);
+    } else {
+      goog.asserts.fail();
+    }
+    gl.bufferData(target, arrayBuffer, buf.getUsage());
+    this.bufferCache_[bufferKey] = {
+      buf: buf,
+      buffer: buffer
+    };
+  }
+};
+
+
+/**
+ * @param {ol.webgl.Buffer} buf Buffer.
+ */
+ol.webgl.Context.prototype.deleteBuffer = function(buf) {
+  var gl = this.getGL();
+  var bufferKey = goog.getUid(buf);
+  goog.asserts.assert(bufferKey in this.bufferCache_,
+      'attempted to delete uncached buffer');
+  var bufferCacheEntry = this.bufferCache_[bufferKey];
+  if (!gl.isContextLost()) {
+    gl.deleteBuffer(bufferCacheEntry.buffer);
+  }
+  delete this.bufferCache_[bufferKey];
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.webgl.Context.prototype.disposeInternal = function() {
+  var gl = this.getGL();
+  if (!gl.isContextLost()) {
+    goog.object.forEach(this.bufferCache_, function(bufferCacheEntry) {
+      gl.deleteBuffer(bufferCacheEntry.buffer);
+    });
+    goog.object.forEach(this.programCache_, function(program) {
+      gl.deleteProgram(program);
+    });
+    goog.object.forEach(this.shaderCache_, function(shader) {
+      gl.deleteShader(shader);
+    });
+    // delete objects for hit-detection
+    gl.deleteFramebuffer(this.hitDetectionFramebuffer_);
+    gl.deleteRenderbuffer(this.hitDetectionRenderbuffer_);
+    gl.deleteTexture(this.hitDetectionTexture_);
+  }
+};
+
+
+/**
+ * @return {HTMLCanvasElement} Canvas.
+ */
+ol.webgl.Context.prototype.getCanvas = function() {
+  return this.canvas_;
+};
+
+
+/**
+ * Get the WebGL rendering context
+ * @return {WebGLRenderingContext} The rendering context.
+ * @api
+ */
+ol.webgl.Context.prototype.getGL = function() {
+  return this.gl_;
+};
+
+
+/**
+ * Get the frame buffer for hit detection.
+ * @return {WebGLFramebuffer} The hit detection frame buffer.
+ */
+ol.webgl.Context.prototype.getHitDetectionFramebuffer = function() {
+  if (!this.hitDetectionFramebuffer_) {
+    this.initHitDetectionFramebuffer_();
+  }
+  return this.hitDetectionFramebuffer_;
+};
+
+
+/**
+ * Get shader from the cache if it's in the cache. Otherwise, create
+ * the WebGL shader, compile it, and add entry to cache.
+ * @param {ol.webgl.Shader} shaderObject Shader object.
+ * @return {WebGLShader} Shader.
+ */
+ol.webgl.Context.prototype.getShader = function(shaderObject) {
+  var shaderKey = goog.getUid(shaderObject);
+  if (shaderKey in this.shaderCache_) {
+    return this.shaderCache_[shaderKey];
+  } else {
+    var gl = this.getGL();
+    var shader = gl.createShader(shaderObject.getType());
+    gl.shaderSource(shader, shaderObject.getSource());
+    gl.compileShader(shader);
+    if (goog.DEBUG) {
+      if (!gl.getShaderParameter(shader, goog.webgl.COMPILE_STATUS) &&
+          !gl.isContextLost()) {
+        goog.log.error(this.logger_, gl.getShaderInfoLog(shader));
+      }
+    }
+    goog.asserts.assert(
+        gl.getShaderParameter(shader, goog.webgl.COMPILE_STATUS) ||
+        gl.isContextLost(),
+        'illegal state, shader not compiled or context lost');
+    this.shaderCache_[shaderKey] = shader;
+    return shader;
+  }
+};
+
+
+/**
+ * Get the program from the cache if it's in the cache. Otherwise create
+ * the WebGL program, attach the shaders to it, and add an entry to the
+ * cache.
+ * @param {ol.webgl.shader.Fragment} fragmentShaderObject Fragment shader.
+ * @param {ol.webgl.shader.Vertex} vertexShaderObject Vertex shader.
+ * @return {WebGLProgram} Program.
+ */
+ol.webgl.Context.prototype.getProgram = function(
+    fragmentShaderObject, vertexShaderObject) {
+  var programKey =
+      goog.getUid(fragmentShaderObject) + '/' + goog.getUid(vertexShaderObject);
+  if (programKey in this.programCache_) {
+    return this.programCache_[programKey];
+  } else {
+    var gl = this.getGL();
+    var program = gl.createProgram();
+    gl.attachShader(program, this.getShader(fragmentShaderObject));
+    gl.attachShader(program, this.getShader(vertexShaderObject));
+    gl.linkProgram(program);
+    if (goog.DEBUG) {
+      if (!gl.getProgramParameter(program, goog.webgl.LINK_STATUS) &&
+          !gl.isContextLost()) {
+        goog.log.error(this.logger_, gl.getProgramInfoLog(program));
+      }
+    }
+    goog.asserts.assert(
+        gl.getProgramParameter(program, goog.webgl.LINK_STATUS) ||
+        gl.isContextLost(),
+        'illegal state, shader not linked or context lost');
+    this.programCache_[programKey] = program;
+    return program;
+  }
+};
+
+
+/**
+ * FIXME empy description for jsdoc
+ */
+ol.webgl.Context.prototype.handleWebGLContextLost = function() {
+  goog.object.clear(this.bufferCache_);
+  goog.object.clear(this.shaderCache_);
+  goog.object.clear(this.programCache_);
+  this.currentProgram_ = null;
+  this.hitDetectionFramebuffer_ = null;
+  this.hitDetectionTexture_ = null;
+  this.hitDetectionRenderbuffer_ = null;
+};
+
+
+/**
+ * FIXME empy description for jsdoc
+ */
+ol.webgl.Context.prototype.handleWebGLContextRestored = function() {
+};
+
+
+/**
+ * Creates a 1x1 pixel framebuffer for the hit-detection.
+ * @private
+ */
+ol.webgl.Context.prototype.initHitDetectionFramebuffer_ = function() {
+  var gl = this.gl_;
+  var framebuffer = gl.createFramebuffer();
+  gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);
+
+  var texture = ol.webgl.Context.createEmptyTexture(gl, 1, 1);
+  var renderbuffer = gl.createRenderbuffer();
+  gl.bindRenderbuffer(gl.RENDERBUFFER, renderbuffer);
+  gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, 1, 1);
+  gl.framebufferTexture2D(
+      gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
+  gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT,
+      gl.RENDERBUFFER, renderbuffer);
+
+  gl.bindTexture(gl.TEXTURE_2D, null);
+  gl.bindRenderbuffer(gl.RENDERBUFFER, null);
+  gl.bindFramebuffer(gl.FRAMEBUFFER, null);
+
+  this.hitDetectionFramebuffer_ = framebuffer;
+  this.hitDetectionTexture_ = texture;
+  this.hitDetectionRenderbuffer_ = renderbuffer;
+};
+
+
+/**
+ * Use a program.  If the program is already in use, this will return `false`.
+ * @param {WebGLProgram} program Program.
+ * @return {boolean} Changed.
+ * @api
+ */
+ol.webgl.Context.prototype.useProgram = function(program) {
+  if (program == this.currentProgram_) {
+    return false;
+  } else {
+    var gl = this.getGL();
+    gl.useProgram(program);
+    this.currentProgram_ = program;
+    return true;
+  }
+};
+
+
+/**
+ * @private
+ * @type {goog.log.Logger}
+ */
+ol.webgl.Context.prototype.logger_ = goog.log.getLogger('ol.webgl.Context');
+
+
+/**
+ * @param {WebGLRenderingContext} gl WebGL rendering context.
+ * @param {number=} opt_wrapS wrapS.
+ * @param {number=} opt_wrapT wrapT.
+ * @return {WebGLTexture}
+ * @private
+ */
+ol.webgl.Context.createTexture_ = function(gl, opt_wrapS, opt_wrapT) {
+  var texture = gl.createTexture();
+  gl.bindTexture(gl.TEXTURE_2D, texture);
+  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
+  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
+
+  if (opt_wrapS !== undefined) {
+    gl.texParameteri(
+        goog.webgl.TEXTURE_2D, goog.webgl.TEXTURE_WRAP_S, opt_wrapS);
+  }
+  if (opt_wrapT !== undefined) {
+    gl.texParameteri(
+        goog.webgl.TEXTURE_2D, goog.webgl.TEXTURE_WRAP_T, opt_wrapT);
+  }
+
+  return texture;
+};
+
+
+/**
+ * @param {WebGLRenderingContext} gl WebGL rendering context.
+ * @param {number} width Width.
+ * @param {number} height Height.
+ * @param {number=} opt_wrapS wrapS.
+ * @param {number=} opt_wrapT wrapT.
+ * @return {WebGLTexture}
+ */
+ol.webgl.Context.createEmptyTexture = function(
+    gl, width, height, opt_wrapS, opt_wrapT) {
+  var texture = ol.webgl.Context.createTexture_(gl, opt_wrapS, opt_wrapT);
+  gl.texImage2D(
+      gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE,
+      null);
+
+  return texture;
+};
+
+
+/**
+ * @param {WebGLRenderingContext} gl WebGL rendering context.
+ * @param {HTMLCanvasElement|HTMLImageElement|HTMLVideoElement} image Image.
+ * @param {number=} opt_wrapS wrapS.
+ * @param {number=} opt_wrapT wrapT.
+ * @return {WebGLTexture}
+ */
+ol.webgl.Context.createTexture = function(gl, image, opt_wrapS, opt_wrapT) {
+  var texture = ol.webgl.Context.createTexture_(gl, opt_wrapS, opt_wrapT);
+  gl.texImage2D(
+      gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
+
+  return texture;
+};
+
+goog.provide('ol.render.webgl.ImageReplay');
+goog.provide('ol.render.webgl.ReplayGroup');
+
+goog.require('goog.asserts');
+goog.require('goog.functions');
+goog.require('goog.object');
+goog.require('goog.vec.Mat4');
+goog.require('ol.extent');
+goog.require('ol.render.IReplayGroup');
+goog.require('ol.render.VectorContext');
+goog.require('ol.render.webgl.imagereplay.shader.Default');
+goog.require('ol.render.webgl.imagereplay.shader.Default.Locations');
+goog.require('ol.render.webgl.imagereplay.shader.DefaultFragment');
+goog.require('ol.render.webgl.imagereplay.shader.DefaultVertex');
+goog.require('ol.vec.Mat4');
+goog.require('ol.webgl.Buffer');
+goog.require('ol.webgl.Context');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.render.VectorContext}
+ * @param {number} tolerance Tolerance.
+ * @param {ol.Extent} maxExtent Max extent.
+ * @protected
+ * @struct
+ */
+ol.render.webgl.ImageReplay = function(tolerance, maxExtent) {
+  goog.base(this);
+
+  /**
+   * @type {number|undefined}
+   * @private
+   */
+  this.anchorX_ = undefined;
+
+  /**
+   * @type {number|undefined}
+   * @private
+   */
+  this.anchorY_ = undefined;
+
+  /**
+   * The origin of the coordinate system for the point coordinates sent to
+   * the GPU. To eliminate jitter caused by precision problems in the GPU
+   * we use the "Rendering Relative to Eye" technique described in the "3D
+   * Engine Design for Virtual Globes" book.
+   * @private
+   * @type {ol.Coordinate}
+   */
+  this.origin_ = ol.extent.getCenter(maxExtent);
+
+  /**
+   * @type {Array.<number>}
+   * @private
+   */
+  this.groupIndices_ = [];
+
+  /**
+   * @type {Array.<number>}
+   * @private
+   */
+  this.hitDetectionGroupIndices_ = [];
+
+  /**
+   * @type {number|undefined}
+   * @private
+   */
+  this.height_ = undefined;
+
+  /**
+   * @type {Array.<HTMLCanvasElement|HTMLImageElement|HTMLVideoElement>}
+   * @private
+   */
+  this.images_ = [];
+
+  /**
+   * @type {Array.<HTMLCanvasElement|HTMLImageElement|HTMLVideoElement>}
+   * @private
+   */
+  this.hitDetectionImages_ = [];
+
+  /**
+   * @type {number|undefined}
+   * @private
+   */
+  this.imageHeight_ = undefined;
+
+  /**
+   * @type {number|undefined}
+   * @private
+   */
+  this.imageWidth_ = undefined;
+
+  /**
+   * @type {Array.<number>}
+   * @private
+   */
+  this.indices_ = [];
+
+  /**
+   * @type {ol.webgl.Buffer}
+   * @private
+   */
+  this.indicesBuffer_ = null;
+
+  /**
+   * @private
+   * @type {ol.render.webgl.imagereplay.shader.Default.Locations}
+   */
+  this.defaultLocations_ = null;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.opacity_ = undefined;
+
+  /**
+   * @type {!goog.vec.Mat4.Number}
+   * @private
+   */
+  this.offsetRotateMatrix_ = goog.vec.Mat4.createNumberIdentity();
+
+  /**
+   * @type {!goog.vec.Mat4.Number}
+   * @private
+   */
+  this.offsetScaleMatrix_ = goog.vec.Mat4.createNumberIdentity();
+
+  /**
+   * @type {number|undefined}
+   * @private
+   */
+  this.originX_ = undefined;
+
+  /**
+   * @type {number|undefined}
+   * @private
+   */
+  this.originY_ = undefined;
+
+  /**
+   * @type {!goog.vec.Mat4.Number}
+   * @private
+   */
+  this.projectionMatrix_ = goog.vec.Mat4.createNumberIdentity();
+
+  /**
+   * @private
+   * @type {boolean|undefined}
+   */
+  this.rotateWithView_ = undefined;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.rotation_ = undefined;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.scale_ = undefined;
+
+  /**
+   * @type {Array.<WebGLTexture>}
+   * @private
+   */
+  this.textures_ = [];
+
+  /**
+   * @type {Array.<WebGLTexture>}
+   * @private
+   */
+  this.hitDetectionTextures_ = [];
+
+  /**
+   * @type {Array.<number>}
+   * @private
+   */
+  this.vertices_ = [];
+
+  /**
+   * @type {ol.webgl.Buffer}
+   * @private
+   */
+  this.verticesBuffer_ = null;
+
+  /**
+   * Start index per feature (the index).
+   * @type {Array.<number>}
+   * @private
+   */
+  this.startIndices_ = [];
+
+  /**
+   * Start index per feature (the feature).
+   * @type {Array.<ol.Feature>}
+   * @private
+   */
+  this.startIndicesFeature_ = [];
+
+  /**
+   * @type {number|undefined}
+   * @private
+   */
+  this.width_ = undefined;
+};
+goog.inherits(ol.render.webgl.ImageReplay, ol.render.VectorContext);
+
+
+/**
+ * @param {ol.webgl.Context} context WebGL context.
+ * @return {function()} Delete resources function.
+ */
+ol.render.webgl.ImageReplay.prototype.getDeleteResourcesFunction =
+    function(context) {
+  // We only delete our stuff here. The shaders and the program may
+  // be used by other ImageReplay instances (for other layers). And
+  // they will be deleted when disposing of the ol.webgl.Context
+  // object.
+  goog.asserts.assert(this.verticesBuffer_,
+      'verticesBuffer must not be null');
+  goog.asserts.assert(this.indicesBuffer_,
+      'indicesBuffer must not be null');
+  var verticesBuffer = this.verticesBuffer_;
+  var indicesBuffer = this.indicesBuffer_;
+  var textures = this.textures_;
+  var hitDetectionTextures = this.hitDetectionTextures_;
+  var gl = context.getGL();
+  return function() {
+    if (!gl.isContextLost()) {
+      var i, ii;
+      for (i = 0, ii = textures.length; i < ii; ++i) {
+        gl.deleteTexture(textures[i]);
+      }
+      for (i = 0, ii = hitDetectionTextures.length; i < ii; ++i) {
+        gl.deleteTexture(hitDetectionTextures[i]);
+      }
+    }
+    context.deleteBuffer(verticesBuffer);
+    context.deleteBuffer(indicesBuffer);
+  };
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.webgl.ImageReplay.prototype.drawAsync = goog.abstractMethod;
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @return {number} My end.
+ * @private
+ */
+ol.render.webgl.ImageReplay.prototype.drawCoordinates_ =
+    function(flatCoordinates, offset, end, stride) {
+  goog.asserts.assert(this.anchorX_ !== undefined, 'anchorX is defined');
+  goog.asserts.assert(this.anchorY_ !== undefined, 'anchorY is defined');
+  goog.asserts.assert(this.height_ !== undefined, 'height is defined');
+  goog.asserts.assert(this.imageHeight_ !== undefined,
+      'imageHeight is defined');
+  goog.asserts.assert(this.imageWidth_ !== undefined, 'imageWidth is defined');
+  goog.asserts.assert(this.opacity_ !== undefined, 'opacity is defined');
+  goog.asserts.assert(this.originX_ !== undefined, 'originX is defined');
+  goog.asserts.assert(this.originY_ !== undefined, 'originY is defined');
+  goog.asserts.assert(this.rotateWithView_ !== undefined,
+      'rotateWithView is defined');
+  goog.asserts.assert(this.rotation_ !== undefined, 'rotation is defined');
+  goog.asserts.assert(this.scale_ !== undefined, 'scale is defined');
+  goog.asserts.assert(this.width_ !== undefined, 'width is defined');
+  var anchorX = this.anchorX_;
+  var anchorY = this.anchorY_;
+  var height = this.height_;
+  var imageHeight = this.imageHeight_;
+  var imageWidth = this.imageWidth_;
+  var opacity = this.opacity_;
+  var originX = this.originX_;
+  var originY = this.originY_;
+  var rotateWithView = this.rotateWithView_ ? 1.0 : 0.0;
+  var rotation = this.rotation_;
+  var scale = this.scale_;
+  var width = this.width_;
+  var cos = Math.cos(rotation);
+  var sin = Math.sin(rotation);
+  var numIndices = this.indices_.length;
+  var numVertices = this.vertices_.length;
+  var i, n, offsetX, offsetY, x, y;
+  for (i = offset; i < end; i += stride) {
+    x = flatCoordinates[i] - this.origin_[0];
+    y = flatCoordinates[i + 1] - this.origin_[1];
+
+    // There are 4 vertices per [x, y] point, one for each corner of the
+    // rectangle we're going to draw. We'd use 1 vertex per [x, y] point if
+    // WebGL supported Geometry Shaders (which can emit new vertices), but that
+    // is not currently the case.
+    //
+    // And each vertex includes 8 values: the x and y coordinates, the x and
+    // y offsets used to calculate the position of the corner, the u and
+    // v texture coordinates for the corner, the opacity, and whether the
+    // the image should be rotated with the view (rotateWithView).
+
+    n = numVertices / 8;
+
+    // bottom-left corner
+    offsetX = -scale * anchorX;
+    offsetY = -scale * (height - anchorY);
+    this.vertices_[numVertices++] = x;
+    this.vertices_[numVertices++] = y;
+    this.vertices_[numVertices++] = offsetX * cos - offsetY * sin;
+    this.vertices_[numVertices++] = offsetX * sin + offsetY * cos;
+    this.vertices_[numVertices++] = originX / imageWidth;
+    this.vertices_[numVertices++] = (originY + height) / imageHeight;
+    this.vertices_[numVertices++] = opacity;
+    this.vertices_[numVertices++] = rotateWithView;
+
+    // bottom-right corner
+    offsetX = scale * (width - anchorX);
+    offsetY = -scale * (height - anchorY);
+    this.vertices_[numVertices++] = x;
+    this.vertices_[numVertices++] = y;
+    this.vertices_[numVertices++] = offsetX * cos - offsetY * sin;
+    this.vertices_[numVertices++] = offsetX * sin + offsetY * cos;
+    this.vertices_[numVertices++] = (originX + width) / imageWidth;
+    this.vertices_[numVertices++] = (originY + height) / imageHeight;
+    this.vertices_[numVertices++] = opacity;
+    this.vertices_[numVertices++] = rotateWithView;
+
+    // top-right corner
+    offsetX = scale * (width - anchorX);
+    offsetY = scale * anchorY;
+    this.vertices_[numVertices++] = x;
+    this.vertices_[numVertices++] = y;
+    this.vertices_[numVertices++] = offsetX * cos - offsetY * sin;
+    this.vertices_[numVertices++] = offsetX * sin + offsetY * cos;
+    this.vertices_[numVertices++] = (originX + width) / imageWidth;
+    this.vertices_[numVertices++] = originY / imageHeight;
+    this.vertices_[numVertices++] = opacity;
+    this.vertices_[numVertices++] = rotateWithView;
+
+    // top-left corner
+    offsetX = -scale * anchorX;
+    offsetY = scale * anchorY;
+    this.vertices_[numVertices++] = x;
+    this.vertices_[numVertices++] = y;
+    this.vertices_[numVertices++] = offsetX * cos - offsetY * sin;
+    this.vertices_[numVertices++] = offsetX * sin + offsetY * cos;
+    this.vertices_[numVertices++] = originX / imageWidth;
+    this.vertices_[numVertices++] = originY / imageHeight;
+    this.vertices_[numVertices++] = opacity;
+    this.vertices_[numVertices++] = rotateWithView;
+
+    this.indices_[numIndices++] = n;
+    this.indices_[numIndices++] = n + 1;
+    this.indices_[numIndices++] = n + 2;
+    this.indices_[numIndices++] = n;
+    this.indices_[numIndices++] = n + 2;
+    this.indices_[numIndices++] = n + 3;
+  }
+
+  return numVertices;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.webgl.ImageReplay.prototype.drawMultiPointGeometry =
+    function(multiPointGeometry, feature) {
+  this.startIndices_.push(this.indices_.length);
+  this.startIndicesFeature_.push(feature);
+  var flatCoordinates = multiPointGeometry.getFlatCoordinates();
+  var stride = multiPointGeometry.getStride();
+  this.drawCoordinates_(
+      flatCoordinates, 0, flatCoordinates.length, stride);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.webgl.ImageReplay.prototype.drawPointGeometry =
+    function(pointGeometry, feature) {
+  this.startIndices_.push(this.indices_.length);
+  this.startIndicesFeature_.push(feature);
+  var flatCoordinates = pointGeometry.getFlatCoordinates();
+  var stride = pointGeometry.getStride();
+  this.drawCoordinates_(
+      flatCoordinates, 0, flatCoordinates.length, stride);
+};
+
+
+/**
+ * @param {ol.webgl.Context} context Context.
+ */
+ol.render.webgl.ImageReplay.prototype.finish = function(context) {
+  var gl = context.getGL();
+
+  this.groupIndices_.push(this.indices_.length);
+  goog.asserts.assert(this.images_.length === this.groupIndices_.length,
+      'number of images and groupIndices match');
+  this.hitDetectionGroupIndices_.push(this.indices_.length);
+  goog.asserts.assert(this.hitDetectionImages_.length ===
+      this.hitDetectionGroupIndices_.length,
+      'number of hitDetectionImages and hitDetectionGroupIndices match');
+
+  // create, bind, and populate the vertices buffer
+  this.verticesBuffer_ = new ol.webgl.Buffer(this.vertices_);
+  context.bindBuffer(goog.webgl.ARRAY_BUFFER, this.verticesBuffer_);
+
+  var indices = this.indices_;
+  var bits = context.hasOESElementIndexUint ? 32 : 16;
+  goog.asserts.assert(indices[indices.length - 1] < Math.pow(2, bits),
+      'Too large element index detected [%s] (OES_element_index_uint "%s")',
+      indices[indices.length - 1], context.hasOESElementIndexUint);
+
+  // create, bind, and populate the indices buffer
+  this.indicesBuffer_ = new ol.webgl.Buffer(indices);
+  context.bindBuffer(goog.webgl.ELEMENT_ARRAY_BUFFER, this.indicesBuffer_);
+
+  // create textures
+  /** @type {Object.<string, WebGLTexture>} */
+  var texturePerImage = {};
+
+  this.createTextures_(this.textures_, this.images_, texturePerImage, gl);
+  goog.asserts.assert(this.textures_.length === this.groupIndices_.length,
+      'number of textures and groupIndices match');
+
+  this.createTextures_(this.hitDetectionTextures_, this.hitDetectionImages_,
+      texturePerImage, gl);
+  goog.asserts.assert(this.hitDetectionTextures_.length ===
+      this.hitDetectionGroupIndices_.length,
+      'number of hitDetectionTextures and hitDetectionGroupIndices match');
+
+  this.anchorX_ = undefined;
+  this.anchorY_ = undefined;
+  this.height_ = undefined;
+  this.images_ = null;
+  this.hitDetectionImages_ = null;
+  this.imageHeight_ = undefined;
+  this.imageWidth_ = undefined;
+  this.indices_ = null;
+  this.opacity_ = undefined;
+  this.originX_ = undefined;
+  this.originY_ = undefined;
+  this.rotateWithView_ = undefined;
+  this.rotation_ = undefined;
+  this.scale_ = undefined;
+  this.vertices_ = null;
+  this.width_ = undefined;
+};
+
+
+/**
+ * @private
+ * @param {Array.<WebGLTexture>} textures Textures.
+ * @param {Array.<HTMLCanvasElement|HTMLImageElement|HTMLVideoElement>} images
+ *    Images.
+ * @param {Object.<string, WebGLTexture>} texturePerImage Texture cache.
+ * @param {WebGLRenderingContext} gl Gl.
+ */
+ol.render.webgl.ImageReplay.prototype.createTextures_ =
+    function(textures, images, texturePerImage, gl) {
+  goog.asserts.assert(textures.length === 0,
+      'upon creation, textures is empty');
+
+  var texture, image, uid, i;
+  var ii = images.length;
+  for (i = 0; i < ii; ++i) {
+    image = images[i];
+
+    uid = goog.getUid(image).toString();
+    if (uid in texturePerImage) {
+      texture = texturePerImage[uid];
+    } else {
+      texture = ol.webgl.Context.createTexture(
+          gl, image, goog.webgl.CLAMP_TO_EDGE, goog.webgl.CLAMP_TO_EDGE);
+      texturePerImage[uid] = texture;
+    }
+    textures[i] = texture;
+  }
+};
+
+
+/**
+ * @param {ol.webgl.Context} context Context.
+ * @param {ol.Coordinate} center Center.
+ * @param {number} resolution Resolution.
+ * @param {number} rotation Rotation.
+ * @param {ol.Size} size Size.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {number} opacity Global opacity.
+ * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
+ *  to skip.
+ * @param {function(ol.Feature): T|undefined} featureCallback Feature callback.
+ * @param {boolean} oneByOne Draw features one-by-one for the hit-detecion.
+ * @param {ol.Extent=} opt_hitExtent Hit extent: Only features intersecting
+ *  this extent are checked.
+ * @return {T|undefined} Callback result.
+ * @template T
+ */
+ol.render.webgl.ImageReplay.prototype.replay = function(context,
+    center, resolution, rotation, size, pixelRatio,
+    opacity, skippedFeaturesHash,
+    featureCallback, oneByOne, opt_hitExtent) {
+  var gl = context.getGL();
+
+  // bind the vertices buffer
+  goog.asserts.assert(this.verticesBuffer_,
+      'verticesBuffer must not be null');
+  context.bindBuffer(goog.webgl.ARRAY_BUFFER, this.verticesBuffer_);
+
+  // bind the indices buffer
+  goog.asserts.assert(this.indicesBuffer_,
+      'indecesBuffer must not be null');
+  context.bindBuffer(goog.webgl.ELEMENT_ARRAY_BUFFER, this.indicesBuffer_);
+
+  // get the program
+  var fragmentShader =
+      ol.render.webgl.imagereplay.shader.DefaultFragment.getInstance();
+  var vertexShader =
+      ol.render.webgl.imagereplay.shader.DefaultVertex.getInstance();
+  var program = context.getProgram(fragmentShader, vertexShader);
+
+  // get the locations
+  var locations;
+  if (!this.defaultLocations_) {
+    locations =
+        new ol.render.webgl.imagereplay.shader.Default.Locations(gl, program);
+    this.defaultLocations_ = locations;
+  } else {
+    locations = this.defaultLocations_;
+  }
+
+  // use the program (FIXME: use the return value)
+  context.useProgram(program);
+
+  // enable the vertex attrib arrays
+  gl.enableVertexAttribArray(locations.a_position);
+  gl.vertexAttribPointer(locations.a_position, 2, goog.webgl.FLOAT,
+      false, 32, 0);
+
+  gl.enableVertexAttribArray(locations.a_offsets);
+  gl.vertexAttribPointer(locations.a_offsets, 2, goog.webgl.FLOAT,
+      false, 32, 8);
+
+  gl.enableVertexAttribArray(locations.a_texCoord);
+  gl.vertexAttribPointer(locations.a_texCoord, 2, goog.webgl.FLOAT,
+      false, 32, 16);
+
+  gl.enableVertexAttribArray(locations.a_opacity);
+  gl.vertexAttribPointer(locations.a_opacity, 1, goog.webgl.FLOAT,
+      false, 32, 24);
+
+  gl.enableVertexAttribArray(locations.a_rotateWithView);
+  gl.vertexAttribPointer(locations.a_rotateWithView, 1, goog.webgl.FLOAT,
+      false, 32, 28);
+
+  // set the "uniform" values
+  var projectionMatrix = this.projectionMatrix_;
+  ol.vec.Mat4.makeTransform2D(projectionMatrix,
+      0.0, 0.0,
+      2 / (resolution * size[0]),
+      2 / (resolution * size[1]),
+      -rotation,
+      -(center[0] - this.origin_[0]), -(center[1] - this.origin_[1]));
+
+  var offsetScaleMatrix = this.offsetScaleMatrix_;
+  goog.vec.Mat4.makeScale(offsetScaleMatrix, 2 / size[0], 2 / size[1], 1);
+
+  var offsetRotateMatrix = this.offsetRotateMatrix_;
+  goog.vec.Mat4.makeIdentity(offsetRotateMatrix);
+  if (rotation !== 0) {
+    goog.vec.Mat4.rotateZ(offsetRotateMatrix, -rotation);
+  }
+
+  gl.uniformMatrix4fv(locations.u_projectionMatrix, false, projectionMatrix);
+  gl.uniformMatrix4fv(locations.u_offsetScaleMatrix, false, offsetScaleMatrix);
+  gl.uniformMatrix4fv(locations.u_offsetRotateMatrix, false,
+      offsetRotateMatrix);
+  gl.uniform1f(locations.u_opacity, opacity);
+
+  // draw!
+  var result;
+  if (featureCallback === undefined) {
+    this.drawReplay_(gl, context, skippedFeaturesHash,
+        this.textures_, this.groupIndices_);
+  } else {
+    // draw feature by feature for the hit-detection
+    result = this.drawHitDetectionReplay_(gl, context, skippedFeaturesHash,
+        featureCallback, oneByOne, opt_hitExtent);
+  }
+
+  // disable the vertex attrib arrays
+  gl.disableVertexAttribArray(locations.a_position);
+  gl.disableVertexAttribArray(locations.a_offsets);
+  gl.disableVertexAttribArray(locations.a_texCoord);
+  gl.disableVertexAttribArray(locations.a_opacity);
+  gl.disableVertexAttribArray(locations.a_rotateWithView);
+
+  return result;
+};
+
+
+/**
+ * @private
+ * @param {WebGLRenderingContext} gl gl.
+ * @param {ol.webgl.Context} context Context.
+ * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
+ *  to skip.
+ * @param {Array.<WebGLTexture>} textures Textures.
+ * @param {Array.<number>} groupIndices Texture group indices.
+ */
+ol.render.webgl.ImageReplay.prototype.drawReplay_ =
+    function(gl, context, skippedFeaturesHash, textures, groupIndices) {
+  goog.asserts.assert(textures.length === groupIndices.length,
+      'number of textures and groupIndeces match');
+  var elementType = context.hasOESElementIndexUint ?
+      goog.webgl.UNSIGNED_INT : goog.webgl.UNSIGNED_SHORT;
+  var elementSize = context.hasOESElementIndexUint ? 4 : 2;
+
+  if (!goog.object.isEmpty(skippedFeaturesHash)) {
+    this.drawReplaySkipping_(
+        gl, skippedFeaturesHash, textures, groupIndices,
+        elementType, elementSize);
+  } else {
+    var i, ii, start;
+    for (i = 0, ii = textures.length, start = 0; i < ii; ++i) {
+      gl.bindTexture(goog.webgl.TEXTURE_2D, textures[i]);
+      var end = groupIndices[i];
+      this.drawElements_(gl, start, end, elementType, elementSize);
+      start = end;
+    }
+  }
+};
+
+
+/**
+ * Draw the replay while paying attention to skipped features.
+ *
+ * This functions creates groups of features that can be drawn to together,
+ * so that the number of `drawElements` calls is minimized.
+ *
+ * For example given the following texture groups:
+ *
+ *    Group 1: A B C
+ *    Group 2: D [E] F G
+ *
+ * If feature E should be skipped, the following `drawElements` calls will be
+ * made:
+ *
+ *    drawElements with feature A, B and C
+ *    drawElements with feature D
+ *    drawElements with feature F and G
+ *
+ * @private
+ * @param {WebGLRenderingContext} gl gl.
+ * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
+ *  to skip.
+ * @param {Array.<WebGLTexture>} textures Textures.
+ * @param {Array.<number>} groupIndices Texture group indices.
+ * @param {number} elementType Element type.
+ * @param {number} elementSize Element Size.
+ */
+ol.render.webgl.ImageReplay.prototype.drawReplaySkipping_ =
+    function(gl, skippedFeaturesHash, textures, groupIndices,
+    elementType, elementSize) {
+  var featureIndex = 0;
+
+  var i, ii;
+  for (i = 0, ii = textures.length; i < ii; ++i) {
+    gl.bindTexture(goog.webgl.TEXTURE_2D, textures[i]);
+    var groupStart = (i > 0) ? groupIndices[i - 1] : 0;
+    var groupEnd = groupIndices[i];
+
+    var start = groupStart;
+    var end = groupStart;
+    while (featureIndex < this.startIndices_.length &&
+        this.startIndices_[featureIndex] <= groupEnd) {
+      var feature = this.startIndicesFeature_[featureIndex];
+
+      var featureUid = goog.getUid(feature).toString();
+      if (skippedFeaturesHash[featureUid] !== undefined) {
+        // feature should be skipped
+        if (start !== end) {
+          // draw the features so far
+          this.drawElements_(gl, start, end, elementType, elementSize);
+        }
+        // continue with the next feature
+        start = (featureIndex === this.startIndices_.length - 1) ?
+            groupEnd : this.startIndices_[featureIndex + 1];
+        end = start;
+      } else {
+        // the feature is not skipped, augment the end index
+        end = (featureIndex === this.startIndices_.length - 1) ?
+            groupEnd : this.startIndices_[featureIndex + 1];
+      }
+      featureIndex++;
+    }
+
+    if (start !== end) {
+      // draw the remaining features (in case there was no skipped feature
+      // in this texture group, all features of a group are drawn together)
+      this.drawElements_(gl, start, end, elementType, elementSize);
+    }
+  }
+};
+
+
+/**
+ * @private
+ * @param {WebGLRenderingContext} gl gl.
+ * @param {number} start Start index.
+ * @param {number} end End index.
+ * @param {number} elementType Element type.
+ * @param {number} elementSize Element Size.
+ */
+ol.render.webgl.ImageReplay.prototype.drawElements_ = function(
+    gl, start, end, elementType, elementSize) {
+  var numItems = end - start;
+  var offsetInBytes = start * elementSize;
+  gl.drawElements(goog.webgl.TRIANGLES, numItems, elementType, offsetInBytes);
+};
+
+
+/**
+ * @private
+ * @param {WebGLRenderingContext} gl gl.
+ * @param {ol.webgl.Context} context Context.
+ * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
+ *  to skip.
+ * @param {function(ol.Feature): T|undefined} featureCallback Feature callback.
+ * @param {boolean} oneByOne Draw features one-by-one for the hit-detecion.
+ * @param {ol.Extent=} opt_hitExtent Hit extent: Only features intersecting
+ *  this extent are checked.
+ * @return {T|undefined} Callback result.
+ * @template T
+ */
+ol.render.webgl.ImageReplay.prototype.drawHitDetectionReplay_ =
+    function(gl, context, skippedFeaturesHash, featureCallback, oneByOne,
+    opt_hitExtent) {
+  if (!oneByOne) {
+    // draw all hit-detection features in "once" (by texture group)
+    return this.drawHitDetectionReplayAll_(gl, context,
+        skippedFeaturesHash, featureCallback);
+  } else {
+    // draw hit-detection features one by one
+    return this.drawHitDetectionReplayOneByOne_(gl, context,
+        skippedFeaturesHash, featureCallback, opt_hitExtent);
+  }
+};
+
+
+/**
+ * @private
+ * @param {WebGLRenderingContext} gl gl.
+ * @param {ol.webgl.Context} context Context.
+ * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
+ *  to skip.
+ * @param {function(ol.Feature): T|undefined} featureCallback Feature callback.
+ * @return {T|undefined} Callback result.
+ * @template T
+ */
+ol.render.webgl.ImageReplay.prototype.drawHitDetectionReplayAll_ =
+    function(gl, context, skippedFeaturesHash, featureCallback) {
+  gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
+  this.drawReplay_(gl, context, skippedFeaturesHash,
+      this.hitDetectionTextures_, this.hitDetectionGroupIndices_);
+
+  var result = featureCallback(null);
+  if (result) {
+    return result;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @private
+ * @param {WebGLRenderingContext} gl gl.
+ * @param {ol.webgl.Context} context Context.
+ * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
+ *  to skip.
+ * @param {function(ol.Feature): T|undefined} featureCallback Feature callback.
+ * @param {ol.Extent=} opt_hitExtent Hit extent: Only features intersecting
+ *  this extent are checked.
+ * @return {T|undefined} Callback result.
+ * @template T
+ */
+ol.render.webgl.ImageReplay.prototype.drawHitDetectionReplayOneByOne_ =
+    function(gl, context, skippedFeaturesHash, featureCallback,
+    opt_hitExtent) {
+  goog.asserts.assert(this.hitDetectionTextures_.length ===
+      this.hitDetectionGroupIndices_.length,
+      'number of hitDetectionTextures and hitDetectionGroupIndices match');
+  var elementType = context.hasOESElementIndexUint ?
+      goog.webgl.UNSIGNED_INT : goog.webgl.UNSIGNED_SHORT;
+  var elementSize = context.hasOESElementIndexUint ? 4 : 2;
+
+  var i, groupStart, start, end, feature, featureUid;
+  var featureIndex = this.startIndices_.length - 1;
+  for (i = this.hitDetectionTextures_.length - 1; i >= 0; --i) {
+    gl.bindTexture(goog.webgl.TEXTURE_2D, this.hitDetectionTextures_[i]);
+    groupStart = (i > 0) ? this.hitDetectionGroupIndices_[i - 1] : 0;
+    end = this.hitDetectionGroupIndices_[i];
+
+    // draw all features for this texture group
+    while (featureIndex >= 0 &&
+        this.startIndices_[featureIndex] >= groupStart) {
+      start = this.startIndices_[featureIndex];
+      feature = this.startIndicesFeature_[featureIndex];
+      featureUid = goog.getUid(feature).toString();
+
+      if (skippedFeaturesHash[featureUid] === undefined &&
+          feature.getGeometry() &&
+          (opt_hitExtent === undefined || ol.extent.intersects(
+              /** @type {Array<number>} */ (opt_hitExtent),
+              feature.getGeometry().getExtent()))) {
+        gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
+        this.drawElements_(gl, start, end, elementType, elementSize);
+
+        var result = featureCallback(feature);
+        if (result) {
+          return result;
+        }
+      }
+
+      end = start;
+      featureIndex--;
+    }
+  }
+  return undefined;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.webgl.ImageReplay.prototype.setFillStrokeStyle = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.webgl.ImageReplay.prototype.setImageStyle = function(imageStyle) {
+  var anchor = imageStyle.getAnchor();
+  var image = imageStyle.getImage(1);
+  var imageSize = imageStyle.getImageSize();
+  var hitDetectionImage = imageStyle.getHitDetectionImage(1);
+  var hitDetectionImageSize = imageStyle.getHitDetectionImageSize();
+  var opacity = imageStyle.getOpacity();
+  var origin = imageStyle.getOrigin();
+  var rotateWithView = imageStyle.getRotateWithView();
+  var rotation = imageStyle.getRotation();
+  var size = imageStyle.getSize();
+  var scale = imageStyle.getScale();
+  goog.asserts.assert(anchor, 'imageStyle anchor is not null');
+  goog.asserts.assert(image, 'imageStyle image is not null');
+  goog.asserts.assert(imageSize,
+      'imageStyle imageSize is not null');
+  goog.asserts.assert(hitDetectionImage,
+      'imageStyle hitDetectionImage is not null');
+  goog.asserts.assert(hitDetectionImageSize,
+      'imageStyle hitDetectionImageSize is not null');
+  goog.asserts.assert(opacity !== undefined, 'imageStyle opacity is defined');
+  goog.asserts.assert(origin, 'imageStyle origin is not null');
+  goog.asserts.assert(rotateWithView !== undefined,
+      'imageStyle rotateWithView is defined');
+  goog.asserts.assert(rotation !== undefined, 'imageStyle rotation is defined');
+  goog.asserts.assert(size, 'imageStyle size is not null');
+  goog.asserts.assert(scale !== undefined, 'imageStyle scale is defined');
+
+  var currentImage;
+  if (this.images_.length === 0) {
+    this.images_.push(image);
+  } else {
+    currentImage = this.images_[this.images_.length - 1];
+    if (goog.getUid(currentImage) != goog.getUid(image)) {
+      this.groupIndices_.push(this.indices_.length);
+      goog.asserts.assert(this.groupIndices_.length === this.images_.length,
+          'number of groupIndices and images match');
+      this.images_.push(image);
+    }
+  }
+
+  if (this.hitDetectionImages_.length === 0) {
+    this.hitDetectionImages_.push(hitDetectionImage);
+  } else {
+    currentImage =
+        this.hitDetectionImages_[this.hitDetectionImages_.length - 1];
+    if (goog.getUid(currentImage) != goog.getUid(hitDetectionImage)) {
+      this.hitDetectionGroupIndices_.push(this.indices_.length);
+      goog.asserts.assert(this.hitDetectionGroupIndices_.length ===
+          this.hitDetectionImages_.length,
+          'number of hitDetectionGroupIndices and hitDetectionImages match');
+      this.hitDetectionImages_.push(hitDetectionImage);
+    }
+  }
+
+  this.anchorX_ = anchor[0];
+  this.anchorY_ = anchor[1];
+  this.height_ = size[1];
+  this.imageHeight_ = imageSize[1];
+  this.imageWidth_ = imageSize[0];
+  this.opacity_ = opacity;
+  this.originX_ = origin[0];
+  this.originY_ = origin[1];
+  this.rotation_ = rotation;
+  this.rotateWithView_ = rotateWithView;
+  this.scale_ = scale;
+  this.width_ = size[0];
+};
+
+
+
+/**
+ * @constructor
+ * @implements {ol.render.IReplayGroup}
+ * @param {number} tolerance Tolerance.
+ * @param {ol.Extent} maxExtent Max extent.
+ * @param {number=} opt_renderBuffer Render buffer.
+ * @struct
+ */
+ol.render.webgl.ReplayGroup = function(
+    tolerance, maxExtent, opt_renderBuffer) {
+
+  /**
+   * @type {ol.Extent}
+   * @private
+   */
+  this.maxExtent_ = maxExtent;
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.tolerance_ = tolerance;
+
+  /**
+   * @type {number|undefined}
+   * @private
+   */
+  this.renderBuffer_ = opt_renderBuffer;
+
+  /**
+   * ImageReplay only is supported at this point.
+   * @type {Object.<ol.render.ReplayType, ol.render.webgl.ImageReplay>}
+   * @private
+   */
+  this.replays_ = {};
+
+};
+
+
+/**
+ * @param {ol.webgl.Context} context WebGL context.
+ * @return {function()} Delete resources function.
+ */
+ol.render.webgl.ReplayGroup.prototype.getDeleteResourcesFunction =
+    function(context) {
+  var functions = [];
+  var replayKey;
+  for (replayKey in this.replays_) {
+    functions.push(
+        this.replays_[replayKey].getDeleteResourcesFunction(context));
+  }
+  return goog.functions.sequence.apply(null, functions);
+};
+
+
+/**
+ * @param {ol.webgl.Context} context Context.
+ */
+ol.render.webgl.ReplayGroup.prototype.finish = function(context) {
+  var replayKey;
+  for (replayKey in this.replays_) {
+    this.replays_[replayKey].finish(context);
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.webgl.ReplayGroup.prototype.getReplay =
+    function(zIndex, replayType) {
+  var replay = this.replays_[replayType];
+  if (replay === undefined) {
+    var constructor = ol.render.webgl.BATCH_CONSTRUCTORS_[replayType];
+    goog.asserts.assert(constructor !== undefined,
+        replayType +
+        ' constructor missing from ol.render.webgl.BATCH_CONSTRUCTORS_');
+    replay = new constructor(this.tolerance_, this.maxExtent_);
+    this.replays_[replayType] = replay;
+  }
+  return replay;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.render.webgl.ReplayGroup.prototype.isEmpty = function() {
+  return goog.object.isEmpty(this.replays_);
+};
+
+
+/**
+ * @param {ol.webgl.Context} context Context.
+ * @param {ol.Coordinate} center Center.
+ * @param {number} resolution Resolution.
+ * @param {number} rotation Rotation.
+ * @param {ol.Size} size Size.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {number} opacity Global opacity.
+ * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
+ *  to skip.
+ */
+ol.render.webgl.ReplayGroup.prototype.replay = function(context,
+    center, resolution, rotation, size, pixelRatio,
+    opacity, skippedFeaturesHash) {
+  var i, ii, replay;
+  for (i = 0, ii = ol.render.REPLAY_ORDER.length; i < ii; ++i) {
+    replay = this.replays_[ol.render.REPLAY_ORDER[i]];
+    if (replay !== undefined) {
+      replay.replay(context,
+          center, resolution, rotation, size, pixelRatio,
+          opacity, skippedFeaturesHash,
+          undefined, false);
+    }
+  }
+};
+
+
+/**
+ * @private
+ * @param {ol.webgl.Context} context Context.
+ * @param {ol.Coordinate} center Center.
+ * @param {number} resolution Resolution.
+ * @param {number} rotation Rotation.
+ * @param {ol.Size} size Size.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {number} opacity Global opacity.
+ * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
+ *  to skip.
+ * @param {function(ol.Feature): T|undefined} featureCallback Feature callback.
+ * @param {boolean} oneByOne Draw features one-by-one for the hit-detecion.
+ * @param {ol.Extent=} opt_hitExtent Hit extent: Only features intersecting
+ *  this extent are checked.
+ * @return {T|undefined} Callback result.
+ * @template T
+ */
+ol.render.webgl.ReplayGroup.prototype.replayHitDetection_ = function(context,
+    center, resolution, rotation, size, pixelRatio, opacity,
+    skippedFeaturesHash, featureCallback, oneByOne, opt_hitExtent) {
+  var i, replay, result;
+  for (i = ol.render.REPLAY_ORDER.length - 1; i >= 0; --i) {
+    replay = this.replays_[ol.render.REPLAY_ORDER[i]];
+    if (replay !== undefined) {
+      result = replay.replay(context,
+          center, resolution, rotation, size, pixelRatio, opacity,
+          skippedFeaturesHash, featureCallback, oneByOne, opt_hitExtent);
+      if (result) {
+        return result;
+      }
+    }
+  }
+  return undefined;
+};
+
+
+/**
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {ol.webgl.Context} context Context.
+ * @param {ol.Coordinate} center Center.
+ * @param {number} resolution Resolution.
+ * @param {number} rotation Rotation.
+ * @param {ol.Size} size Size.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {number} opacity Global opacity.
+ * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
+ *  to skip.
+ * @param {function(ol.Feature): T|undefined} callback Feature callback.
+ * @return {T|undefined} Callback result.
+ * @template T
+ */
+ol.render.webgl.ReplayGroup.prototype.forEachFeatureAtCoordinate = function(
+    coordinate, context, center, resolution, rotation, size, pixelRatio,
+    opacity, skippedFeaturesHash,
+    callback) {
+  var gl = context.getGL();
+  gl.bindFramebuffer(
+      gl.FRAMEBUFFER, context.getHitDetectionFramebuffer());
+
+
+  /**
+   * @type {ol.Extent}
+   */
+  var hitExtent;
+  if (this.renderBuffer_ !== undefined) {
+    // build an extent around the coordinate, so that only features that
+    // intersect this extent are checked
+    hitExtent = ol.extent.buffer(
+        ol.extent.createOrUpdateFromCoordinate(coordinate),
+        resolution * this.renderBuffer_);
+  }
+
+  return this.replayHitDetection_(context,
+      coordinate, resolution, rotation, ol.render.webgl.HIT_DETECTION_SIZE_,
+      pixelRatio, opacity, skippedFeaturesHash,
+      /**
+       * @param {ol.Feature} feature Feature.
+       * @return {?} Callback result.
+       */
+      function(feature) {
+        var imageData = new Uint8Array(4);
+        gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, imageData);
+
+        if (imageData[3] > 0) {
+          var result = callback(feature);
+          if (result) {
+            return result;
+          }
+        }
+      }, true, hitExtent);
+};
+
+
+/**
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {ol.webgl.Context} context Context.
+ * @param {ol.Coordinate} center Center.
+ * @param {number} resolution Resolution.
+ * @param {number} rotation Rotation.
+ * @param {ol.Size} size Size.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {number} opacity Global opacity.
+ * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
+ *  to skip.
+ * @return {boolean} Is there a feature at the given coordinate?
+ */
+ol.render.webgl.ReplayGroup.prototype.hasFeatureAtCoordinate = function(
+    coordinate, context, center, resolution, rotation, size, pixelRatio,
+    opacity, skippedFeaturesHash) {
+  var gl = context.getGL();
+  gl.bindFramebuffer(
+      gl.FRAMEBUFFER, context.getHitDetectionFramebuffer());
+
+  var hasFeature = this.replayHitDetection_(context,
+      coordinate, resolution, rotation, ol.render.webgl.HIT_DETECTION_SIZE_,
+      pixelRatio, opacity, skippedFeaturesHash,
+      /**
+       * @param {ol.Feature} feature Feature.
+       * @return {boolean} Is there a feature?
+       */
+      function(feature) {
+        var imageData = new Uint8Array(4);
+        gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, imageData);
+        return imageData[3] > 0;
+      }, false);
+
+  return hasFeature !== undefined;
+};
+
+
+/**
+ * @const
+ * @private
+ * @type {Object.<ol.render.ReplayType,
+ *                function(new: ol.render.webgl.ImageReplay, number,
+ *                ol.Extent)>}
+ */
+ol.render.webgl.BATCH_CONSTRUCTORS_ = {
+  'Image': ol.render.webgl.ImageReplay
+};
+
+
+/**
+ * @const
+ * @private
+ * @type {Array.<number>}
+ */
+ol.render.webgl.HIT_DETECTION_SIZE_ = [1, 1];
+
+goog.provide('ol.render.webgl.Immediate');
+goog.require('ol.array');
+goog.require('ol.extent');
+goog.require('ol.render.VectorContext');
+goog.require('ol.render.webgl.ImageReplay');
+goog.require('ol.render.webgl.ReplayGroup');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.render.VectorContext}
+ * @param {ol.webgl.Context} context Context.
+ * @param {ol.Coordinate} center Center.
+ * @param {number} resolution Resolution.
+ * @param {number} rotation Rotation.
+ * @param {ol.Size} size Size.
+ * @param {ol.Extent} extent Extent.
+ * @param {number} pixelRatio Pixel ratio.
+ * @struct
+ */
+ol.render.webgl.Immediate = function(context,
+    center, resolution, rotation, size, extent, pixelRatio) {
+  goog.base(this);
+
+  /**
+   * @private
+   */
+  this.context_ = context;
+
+  /**
+   * @private
+   */
+  this.center_ = center;
+
+  /**
+   * @private
+   */
+  this.extent_ = extent;
+
+  /**
+   * @private
+   */
+  this.pixelRatio_ = pixelRatio;
+
+  /**
+   * @private
+   */
+  this.size_ = size;
+
+  /**
+   * @private
+   */
+  this.rotation_ = rotation;
+
+  /**
+   * @private
+   */
+  this.resolution_ = resolution;
+
+  /**
+   * @private
+   * @type {ol.style.Image}
+   */
+  this.imageStyle_ = null;
+
+  /**
+   * @private
+   * @type {!Object.<string,
+   *        Array.<function(ol.render.webgl.Immediate)>>}
+   */
+  this.callbacksByZIndex_ = {};
+};
+goog.inherits(ol.render.webgl.Immediate, ol.render.VectorContext);
+
+
+/**
+ * FIXME: empty description for jsdoc
+ */
+ol.render.webgl.Immediate.prototype.flush = function() {
+  /** @type {Array.<number>} */
+  var zs = Object.keys(this.callbacksByZIndex_).map(Number);
+  zs.sort(ol.array.numberSafeCompareFunction);
+  var i, ii, callbacks, j, jj;
+  for (i = 0, ii = zs.length; i < ii; ++i) {
+    callbacks = this.callbacksByZIndex_[zs[i].toString()];
+    for (j = 0, jj = callbacks.length; j < jj; ++j) {
+      callbacks[j](this);
+    }
+  }
+};
+
+
+/**
+ * Register a function to be called for rendering at a given zIndex.  The
+ * function will be called asynchronously.  The callback will receive a
+ * reference to {@link ol.render.canvas.Immediate} context for drawing.
+ * @param {number} zIndex Z index.
+ * @param {function(ol.render.webgl.Immediate)} callback Callback.
+ * @api
+ */
+ol.render.webgl.Immediate.prototype.drawAsync = function(zIndex, callback) {
+  var zIndexKey = zIndex.toString();
+  var callbacks = this.callbacksByZIndex_[zIndexKey];
+  if (callbacks !== undefined) {
+    callbacks.push(callback);
+  } else {
+    this.callbacksByZIndex_[zIndexKey] = [callback];
+  }
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.render.webgl.Immediate.prototype.drawCircleGeometry =
+    function(circleGeometry, data) {
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.render.webgl.Immediate.prototype.drawFeature = function(feature, style) {
+  var geometry = style.getGeometryFunction()(feature);
+  if (!geometry ||
+      !ol.extent.intersects(this.extent_, geometry.getExtent())) {
+    return;
+  }
+  var zIndex = style.getZIndex();
+  if (zIndex === undefined) {
+    zIndex = 0;
+  }
+  this.drawAsync(zIndex, function(render) {
+    render.setFillStrokeStyle(style.getFill(), style.getStroke());
+    render.setImageStyle(style.getImage());
+    render.setTextStyle(style.getText());
+    var type = geometry.getType();
+    var renderGeometry = ol.render.webgl.Immediate.GEOMETRY_RENDERERS_[type];
+    // Do not assert since all kinds of geometries are not handled yet.
+    // In spite, render what we support.
+    if (renderGeometry) {
+      renderGeometry.call(render, geometry, null);
+    }
+  });
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.render.webgl.Immediate.prototype.drawGeometryCollectionGeometry =
+    function(geometryCollectionGeometry, data) {
+  var geometries = geometryCollectionGeometry.getGeometriesArray();
+  var renderers = ol.render.webgl.Immediate.GEOMETRY_RENDERERS_;
+  var i, ii;
+  for (i = 0, ii = geometries.length; i < ii; ++i) {
+    var geometry = geometries[i];
+    var geometryRenderer = renderers[geometry.getType()];
+    // Do not assert since all kinds of geometries are not handled yet.
+    // In order to support hierarchies, delegate instead what we can to
+    // valid renderers.
+    if (geometryRenderer) {
+      geometryRenderer.call(this, geometry, data);
+    }
+  }
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.render.webgl.Immediate.prototype.drawPointGeometry =
+    function(pointGeometry, data) {
+  var context = this.context_;
+  var replayGroup = new ol.render.webgl.ReplayGroup(1, this.extent_);
+  var replay = /** @type {ol.render.webgl.ImageReplay} */ (
+      replayGroup.getReplay(0, ol.render.ReplayType.IMAGE));
+  replay.setImageStyle(this.imageStyle_);
+  replay.drawPointGeometry(pointGeometry, data);
+  replay.finish(context);
+  // default colors
+  var opacity = 1;
+  var skippedFeatures = {};
+  var featureCallback;
+  var oneByOne = false;
+  replay.replay(this.context_, this.center_, this.resolution_, this.rotation_,
+      this.size_, this.pixelRatio_, opacity, skippedFeatures, featureCallback,
+      oneByOne);
+  replay.getDeleteResourcesFunction(context)();
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.render.webgl.Immediate.prototype.drawLineStringGeometry =
+    function(lineStringGeometry, data) {
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.render.webgl.Immediate.prototype.drawMultiLineStringGeometry =
+    function(multiLineStringGeometry, data) {
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.render.webgl.Immediate.prototype.drawMultiPointGeometry =
+    function(multiPointGeometry, data) {
+  var context = this.context_;
+  var replayGroup = new ol.render.webgl.ReplayGroup(1, this.extent_);
+  var replay = /** @type {ol.render.webgl.ImageReplay} */ (
+      replayGroup.getReplay(0, ol.render.ReplayType.IMAGE));
+  replay.setImageStyle(this.imageStyle_);
+  replay.drawMultiPointGeometry(multiPointGeometry, data);
+  replay.finish(context);
+  var opacity = 1;
+  var skippedFeatures = {};
+  var featureCallback;
+  var oneByOne = false;
+  replay.replay(this.context_, this.center_, this.resolution_, this.rotation_,
+      this.size_, this.pixelRatio_, opacity, skippedFeatures, featureCallback,
+      oneByOne);
+  replay.getDeleteResourcesFunction(context)();
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.render.webgl.Immediate.prototype.drawMultiPolygonGeometry =
+    function(multiPolygonGeometry, data) {
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.render.webgl.Immediate.prototype.drawPolygonGeometry =
+    function(polygonGeometry, data) {
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.render.webgl.Immediate.prototype.drawText =
+    function(flatCoordinates, offset, end, stride, geometry, data) {
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.render.webgl.Immediate.prototype.setFillStrokeStyle =
+    function(fillStyle, strokeStyle) {
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.render.webgl.Immediate.prototype.setImageStyle = function(imageStyle) {
+  this.imageStyle_ = imageStyle;
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.render.webgl.Immediate.prototype.setTextStyle = function(textStyle) {
+};
+
+
+/**
+ * @const
+ * @private
+ * @type {Object.<ol.geom.GeometryType,
+ *      function(this: ol.render.webgl.Immediate,
+ *          (ol.geom.Geometry|ol.render.Feature), Object)>}
+ */
+ol.render.webgl.Immediate.GEOMETRY_RENDERERS_ = {
+  'Point': ol.render.webgl.Immediate.prototype.drawPointGeometry,
+  'MultiPoint': ol.render.webgl.Immediate.prototype.drawMultiPointGeometry,
+  'GeometryCollection':
+      ol.render.webgl.Immediate.prototype.drawGeometryCollectionGeometry
+};
+
+// This file is automatically generated, do not edit
+goog.provide('ol.renderer.webgl.map.shader.Default');
+goog.provide('ol.renderer.webgl.map.shader.Default.Locations');
+goog.provide('ol.renderer.webgl.map.shader.DefaultFragment');
+goog.provide('ol.renderer.webgl.map.shader.DefaultVertex');
+
+goog.require('ol.webgl.shader');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.webgl.shader.Fragment}
+ * @struct
+ */
+ol.renderer.webgl.map.shader.DefaultFragment = function() {
+  goog.base(this, ol.renderer.webgl.map.shader.DefaultFragment.SOURCE);
+};
+goog.inherits(ol.renderer.webgl.map.shader.DefaultFragment, ol.webgl.shader.Fragment);
+goog.addSingletonGetter(ol.renderer.webgl.map.shader.DefaultFragment);
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.renderer.webgl.map.shader.DefaultFragment.DEBUG_SOURCE = 'precision mediump float;\nvarying vec2 v_texCoord;\n\n\nuniform float u_opacity;\nuniform sampler2D u_texture;\n\nvoid main(void) {\n  vec4 texColor = texture2D(u_texture, v_texCoord);\n  gl_FragColor.rgb = texColor.rgb;\n  gl_FragColor.a = texColor.a * u_opacity;\n}\n';
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.renderer.webgl.map.shader.DefaultFragment.OPTIMIZED_SOURCE = 'precision mediump float;varying vec2 a;uniform float f;uniform sampler2D g;void main(void){vec4 texColor=texture2D(g,a);gl_FragColor.rgb=texColor.rgb;gl_FragColor.a=texColor.a*f;}';
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.renderer.webgl.map.shader.DefaultFragment.SOURCE = goog.DEBUG ?
+    ol.renderer.webgl.map.shader.DefaultFragment.DEBUG_SOURCE :
+    ol.renderer.webgl.map.shader.DefaultFragment.OPTIMIZED_SOURCE;
+
+
+
+/**
+ * @constructor
+ * @extends {ol.webgl.shader.Vertex}
+ * @struct
+ */
+ol.renderer.webgl.map.shader.DefaultVertex = function() {
+  goog.base(this, ol.renderer.webgl.map.shader.DefaultVertex.SOURCE);
+};
+goog.inherits(ol.renderer.webgl.map.shader.DefaultVertex, ol.webgl.shader.Vertex);
+goog.addSingletonGetter(ol.renderer.webgl.map.shader.DefaultVertex);
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.renderer.webgl.map.shader.DefaultVertex.DEBUG_SOURCE = 'varying vec2 v_texCoord;\n\n\nattribute vec2 a_position;\nattribute vec2 a_texCoord;\n\nuniform mat4 u_texCoordMatrix;\nuniform mat4 u_projectionMatrix;\n\nvoid main(void) {\n  gl_Position = u_projectionMatrix * vec4(a_position, 0., 1.);\n  v_texCoord = (u_texCoordMatrix * vec4(a_texCoord, 0., 1.)).st;\n}\n\n\n';
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.renderer.webgl.map.shader.DefaultVertex.OPTIMIZED_SOURCE = 'varying vec2 a;attribute vec2 b;attribute vec2 c;uniform mat4 d;uniform mat4 e;void main(void){gl_Position=e*vec4(b,0.,1.);a=(d*vec4(c,0.,1.)).st;}';
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.renderer.webgl.map.shader.DefaultVertex.SOURCE = goog.DEBUG ?
+    ol.renderer.webgl.map.shader.DefaultVertex.DEBUG_SOURCE :
+    ol.renderer.webgl.map.shader.DefaultVertex.OPTIMIZED_SOURCE;
+
+
+
+/**
+ * @constructor
+ * @param {WebGLRenderingContext} gl GL.
+ * @param {WebGLProgram} program Program.
+ * @struct
+ */
+ol.renderer.webgl.map.shader.Default.Locations = function(gl, program) {
+
+  /**
+   * @type {WebGLUniformLocation}
+   */
+  this.u_opacity = gl.getUniformLocation(
+      program, goog.DEBUG ? 'u_opacity' : 'f');
+
+  /**
+   * @type {WebGLUniformLocation}
+   */
+  this.u_projectionMatrix = gl.getUniformLocation(
+      program, goog.DEBUG ? 'u_projectionMatrix' : 'e');
+
+  /**
+   * @type {WebGLUniformLocation}
+   */
+  this.u_texCoordMatrix = gl.getUniformLocation(
+      program, goog.DEBUG ? 'u_texCoordMatrix' : 'd');
+
+  /**
+   * @type {WebGLUniformLocation}
+   */
+  this.u_texture = gl.getUniformLocation(
+      program, goog.DEBUG ? 'u_texture' : 'g');
+
+  /**
+   * @type {number}
+   */
+  this.a_position = gl.getAttribLocation(
+      program, goog.DEBUG ? 'a_position' : 'b');
+
+  /**
+   * @type {number}
+   */
+  this.a_texCoord = gl.getAttribLocation(
+      program, goog.DEBUG ? 'a_texCoord' : 'c');
+};
+
+goog.provide('ol.renderer.webgl.Layer');
+
+goog.require('goog.vec.Mat4');
+goog.require('goog.webgl');
+goog.require('ol.layer.Layer');
+goog.require('ol.render.Event');
+goog.require('ol.render.EventType');
+goog.require('ol.render.webgl.Immediate');
+goog.require('ol.renderer.Layer');
+goog.require('ol.renderer.webgl.map.shader.Default');
+goog.require('ol.renderer.webgl.map.shader.Default.Locations');
+goog.require('ol.renderer.webgl.map.shader.DefaultFragment');
+goog.require('ol.renderer.webgl.map.shader.DefaultVertex');
+goog.require('ol.webgl.Buffer');
+goog.require('ol.webgl.Context');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.renderer.Layer}
+ * @param {ol.renderer.webgl.Map} mapRenderer Map renderer.
+ * @param {ol.layer.Layer} layer Layer.
+ */
+ol.renderer.webgl.Layer = function(mapRenderer, layer) {
+
+  goog.base(this, layer);
+
+  /**
+   * @protected
+   * @type {ol.renderer.webgl.Map}
+   */
+  this.mapRenderer = mapRenderer;
+
+  /**
+   * @private
+   * @type {ol.webgl.Buffer}
+   */
+  this.arrayBuffer_ = new ol.webgl.Buffer([
+    -1, -1, 0, 0,
+    1, -1, 1, 0,
+    -1, 1, 0, 1,
+    1, 1, 1, 1
+  ]);
+
+  /**
+   * @protected
+   * @type {WebGLTexture}
+   */
+  this.texture = null;
+
+  /**
+   * @protected
+   * @type {WebGLFramebuffer}
+   */
+  this.framebuffer = null;
+
+  /**
+   * @protected
+   * @type {number|undefined}
+   */
+  this.framebufferDimension = undefined;
+
+  /**
+   * @protected
+   * @type {!goog.vec.Mat4.Number}
+   */
+  this.texCoordMatrix = goog.vec.Mat4.createNumber();
+
+  /**
+   * @protected
+   * @type {!goog.vec.Mat4.Number}
+   */
+  this.projectionMatrix = goog.vec.Mat4.createNumberIdentity();
+
+  /**
+   * @private
+   * @type {ol.renderer.webgl.map.shader.Default.Locations}
+   */
+  this.defaultLocations_ = null;
+
+};
+goog.inherits(ol.renderer.webgl.Layer, ol.renderer.Layer);
+
+
+/**
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {number} framebufferDimension Framebuffer dimension.
+ * @protected
+ */
+ol.renderer.webgl.Layer.prototype.bindFramebuffer =
+    function(frameState, framebufferDimension) {
+
+  var gl = this.mapRenderer.getGL();
+
+  if (this.framebufferDimension === undefined ||
+      this.framebufferDimension != framebufferDimension) {
+
+    frameState.postRenderFunctions.push(
+        goog.partial(
+            /**
+             * @param {WebGLRenderingContext} gl GL.
+             * @param {WebGLFramebuffer} framebuffer Framebuffer.
+             * @param {WebGLTexture} texture Texture.
+             */
+            function(gl, framebuffer, texture) {
+              if (!gl.isContextLost()) {
+                gl.deleteFramebuffer(framebuffer);
+                gl.deleteTexture(texture);
+              }
+            }, gl, this.framebuffer, this.texture));
+
+    var texture = ol.webgl.Context.createEmptyTexture(
+        gl, framebufferDimension, framebufferDimension);
+
+    var framebuffer = gl.createFramebuffer();
+    gl.bindFramebuffer(goog.webgl.FRAMEBUFFER, framebuffer);
+    gl.framebufferTexture2D(goog.webgl.FRAMEBUFFER,
+        goog.webgl.COLOR_ATTACHMENT0, goog.webgl.TEXTURE_2D, texture, 0);
+
+    this.texture = texture;
+    this.framebuffer = framebuffer;
+    this.framebufferDimension = framebufferDimension;
+
+  } else {
+    gl.bindFramebuffer(goog.webgl.FRAMEBUFFER, this.framebuffer);
+  }
+
+};
+
+
+/**
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {ol.layer.LayerState} layerState Layer state.
+ * @param {ol.webgl.Context} context Context.
+ */
+ol.renderer.webgl.Layer.prototype.composeFrame =
+    function(frameState, layerState, context) {
+
+  this.dispatchComposeEvent_(
+      ol.render.EventType.PRECOMPOSE, context, frameState);
+
+  context.bindBuffer(goog.webgl.ARRAY_BUFFER, this.arrayBuffer_);
+
+  var gl = context.getGL();
+
+  var fragmentShader =
+      ol.renderer.webgl.map.shader.DefaultFragment.getInstance();
+  var vertexShader = ol.renderer.webgl.map.shader.DefaultVertex.getInstance();
+
+  var program = context.getProgram(fragmentShader, vertexShader);
+
+  var locations;
+  if (!this.defaultLocations_) {
+    locations =
+        new ol.renderer.webgl.map.shader.Default.Locations(gl, program);
+    this.defaultLocations_ = locations;
+  } else {
+    locations = this.defaultLocations_;
+  }
+
+  if (context.useProgram(program)) {
+    gl.enableVertexAttribArray(locations.a_position);
+    gl.vertexAttribPointer(
+        locations.a_position, 2, goog.webgl.FLOAT, false, 16, 0);
+    gl.enableVertexAttribArray(locations.a_texCoord);
+    gl.vertexAttribPointer(
+        locations.a_texCoord, 2, goog.webgl.FLOAT, false, 16, 8);
+    gl.uniform1i(locations.u_texture, 0);
+  }
+
+  gl.uniformMatrix4fv(
+      locations.u_texCoordMatrix, false, this.getTexCoordMatrix());
+  gl.uniformMatrix4fv(locations.u_projectionMatrix, false,
+      this.getProjectionMatrix());
+  gl.uniform1f(locations.u_opacity, layerState.opacity);
+  gl.bindTexture(goog.webgl.TEXTURE_2D, this.getTexture());
+  gl.drawArrays(goog.webgl.TRIANGLE_STRIP, 0, 4);
+
+  this.dispatchComposeEvent_(
+      ol.render.EventType.POSTCOMPOSE, context, frameState);
+
+};
+
+
+/**
+ * @param {ol.render.EventType} type Event type.
+ * @param {ol.webgl.Context} context WebGL context.
+ * @param {olx.FrameState} frameState Frame state.
+ * @private
+ */
+ol.renderer.webgl.Layer.prototype.dispatchComposeEvent_ =
+    function(type, context, frameState) {
+  var layer = this.getLayer();
+  if (layer.hasListener(type)) {
+    var viewState = frameState.viewState;
+    var resolution = viewState.resolution;
+    var pixelRatio = frameState.pixelRatio;
+    var extent = frameState.extent;
+    var center = viewState.center;
+    var rotation = viewState.rotation;
+    var size = frameState.size;
+
+    var render = new ol.render.webgl.Immediate(
+        context, center, resolution, rotation, size, extent, pixelRatio);
+    var composeEvent = new ol.render.Event(
+        type, layer, render, frameState, null, context);
+    layer.dispatchEvent(composeEvent);
+  }
+};
+
+
+/**
+ * @return {!goog.vec.Mat4.Number} Matrix.
+ */
+ol.renderer.webgl.Layer.prototype.getTexCoordMatrix = function() {
+  return this.texCoordMatrix;
+};
+
+
+/**
+ * @return {WebGLTexture} Texture.
+ */
+ol.renderer.webgl.Layer.prototype.getTexture = function() {
+  return this.texture;
+};
+
+
+/**
+ * @return {!goog.vec.Mat4.Number} Matrix.
+ */
+ol.renderer.webgl.Layer.prototype.getProjectionMatrix = function() {
+  return this.projectionMatrix;
+};
+
+
+/**
+ * Handle webglcontextlost.
+ */
+ol.renderer.webgl.Layer.prototype.handleWebGLContextLost = function() {
+  this.texture = null;
+  this.framebuffer = null;
+  this.framebufferDimension = undefined;
+};
+
+
+/**
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {ol.layer.LayerState} layerState Layer state.
+ * @param {ol.webgl.Context} context Context.
+ * @return {boolean} whether composeFrame should be called.
+ */
+ol.renderer.webgl.Layer.prototype.prepareFrame = goog.abstractMethod;
+
+goog.provide('ol.renderer.webgl.ImageLayer');
+
+goog.require('goog.asserts');
+goog.require('goog.functions');
+goog.require('goog.vec.Mat4');
+goog.require('goog.webgl');
+goog.require('ol.Coordinate');
+goog.require('ol.Extent');
+goog.require('ol.ImageBase');
+goog.require('ol.ViewHint');
+goog.require('ol.dom');
+goog.require('ol.extent');
+goog.require('ol.layer.Image');
+goog.require('ol.proj');
+goog.require('ol.renderer.webgl.Layer');
+goog.require('ol.source.ImageVector');
+goog.require('ol.vec.Mat4');
+goog.require('ol.webgl.Context');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.renderer.webgl.Layer}
+ * @param {ol.renderer.webgl.Map} mapRenderer Map renderer.
+ * @param {ol.layer.Image} imageLayer Tile layer.
+ */
+ol.renderer.webgl.ImageLayer = function(mapRenderer, imageLayer) {
+
+  goog.base(this, mapRenderer, imageLayer);
+
+  /**
+   * The last rendered image.
+   * @private
+   * @type {?ol.ImageBase}
+   */
+  this.image_ = null;
+
+  /**
+   * @private
+   * @type {CanvasRenderingContext2D}
+   */
+  this.hitCanvasContext_ = null;
+
+  /**
+   * @private
+   * @type {?goog.vec.Mat4.Number}
+   */
+  this.hitTransformationMatrix_ = null;
+
+};
+goog.inherits(ol.renderer.webgl.ImageLayer, ol.renderer.webgl.Layer);
+
+
+/**
+ * @param {ol.ImageBase} image Image.
+ * @private
+ * @return {WebGLTexture} Texture.
+ */
+ol.renderer.webgl.ImageLayer.prototype.createTexture_ = function(image) {
+
+  // We meet the conditions to work with non-power of two textures.
+  // http://www.khronos.org/webgl/wiki/WebGL_and_OpenGL_Differences#Non-Power_of_Two_Texture_Support
+  // http://learningwebgl.com/blog/?p=2101
+
+  var imageElement = image.getImage();
+  var gl = this.mapRenderer.getGL();
+
+  return ol.webgl.Context.createTexture(
+      gl, imageElement, goog.webgl.CLAMP_TO_EDGE, goog.webgl.CLAMP_TO_EDGE);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.ImageLayer.prototype.forEachFeatureAtCoordinate =
+    function(coordinate, frameState, callback, thisArg) {
+  var layer = this.getLayer();
+  var source = layer.getSource();
+  var resolution = frameState.viewState.resolution;
+  var rotation = frameState.viewState.rotation;
+  var skippedFeatureUids = frameState.skippedFeatureUids;
+  return source.forEachFeatureAtCoordinate(
+      coordinate, resolution, rotation, skippedFeatureUids,
+
+      /**
+       * @param {ol.Feature|ol.render.Feature} feature Feature.
+       * @return {?} Callback result.
+       */
+      function(feature) {
+        return callback.call(thisArg, feature, layer);
+      });
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.ImageLayer.prototype.prepareFrame =
+    function(frameState, layerState, context) {
+
+  var gl = this.mapRenderer.getGL();
+
+  var pixelRatio = frameState.pixelRatio;
+  var viewState = frameState.viewState;
+  var viewCenter = viewState.center;
+  var viewResolution = viewState.resolution;
+  var viewRotation = viewState.rotation;
+
+  var image = this.image_;
+  var texture = this.texture;
+  var imageLayer = this.getLayer();
+  goog.asserts.assertInstanceof(imageLayer, ol.layer.Image,
+      'layer is an instance of ol.layer.Image');
+  var imageSource = imageLayer.getSource();
+
+  var hints = frameState.viewHints;
+
+  var renderedExtent = frameState.extent;
+  if (layerState.extent !== undefined) {
+    renderedExtent = ol.extent.getIntersection(
+        renderedExtent, layerState.extent);
+  }
+  if (!hints[ol.ViewHint.ANIMATING] && !hints[ol.ViewHint.INTERACTING] &&
+      !ol.extent.isEmpty(renderedExtent)) {
+    var projection = viewState.projection;
+    if (!ol.ENABLE_RASTER_REPROJECTION) {
+      var sourceProjection = imageSource.getProjection();
+      if (sourceProjection) {
+        goog.asserts.assert(ol.proj.equivalent(projection, sourceProjection),
+            'projection and sourceProjection are equivalent');
+        projection = sourceProjection;
+      }
+    }
+    var image_ = imageSource.getImage(renderedExtent, viewResolution,
+        pixelRatio, projection);
+    if (image_) {
+      var loaded = this.loadImage(image_);
+      if (loaded) {
+        image = image_;
+        texture = this.createTexture_(image_);
+        if (this.texture) {
+          frameState.postRenderFunctions.push(
+              goog.partial(
+                  /**
+                   * @param {WebGLRenderingContext} gl GL.
+                   * @param {WebGLTexture} texture Texture.
+                   */
+                  function(gl, texture) {
+                    if (!gl.isContextLost()) {
+                      gl.deleteTexture(texture);
+                    }
+                  }, gl, this.texture));
+        }
+      }
+    }
+  }
+
+  if (image) {
+    goog.asserts.assert(texture, 'texture is truthy');
+
+    var canvas = this.mapRenderer.getContext().getCanvas();
+
+    this.updateProjectionMatrix_(canvas.width, canvas.height,
+        pixelRatio, viewCenter, viewResolution, viewRotation,
+        image.getExtent());
+    this.hitTransformationMatrix_ = null;
+
+    // Translate and scale to flip the Y coord.
+    var texCoordMatrix = this.texCoordMatrix;
+    goog.vec.Mat4.makeIdentity(texCoordMatrix);
+    goog.vec.Mat4.scale(texCoordMatrix, 1, -1, 1);
+    goog.vec.Mat4.translate(texCoordMatrix, 0, -1, 0);
+
+    this.image_ = image;
+    this.texture = texture;
+
+    this.updateAttributions(frameState.attributions, image.getAttributions());
+    this.updateLogos(frameState, imageSource);
+  }
+
+  return true;
+};
+
+
+/**
+ * @param {number} canvasWidth Canvas width.
+ * @param {number} canvasHeight Canvas height.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.Coordinate} viewCenter View center.
+ * @param {number} viewResolution View resolution.
+ * @param {number} viewRotation View rotation.
+ * @param {ol.Extent} imageExtent Image extent.
+ * @private
+ */
+ol.renderer.webgl.ImageLayer.prototype.updateProjectionMatrix_ =
+    function(canvasWidth, canvasHeight, pixelRatio,
+        viewCenter, viewResolution, viewRotation, imageExtent) {
+
+  var canvasExtentWidth = canvasWidth * viewResolution;
+  var canvasExtentHeight = canvasHeight * viewResolution;
+
+  var projectionMatrix = this.projectionMatrix;
+  goog.vec.Mat4.makeIdentity(projectionMatrix);
+  goog.vec.Mat4.scale(projectionMatrix,
+      pixelRatio * 2 / canvasExtentWidth,
+      pixelRatio * 2 / canvasExtentHeight, 1);
+  goog.vec.Mat4.rotateZ(projectionMatrix, -viewRotation);
+  goog.vec.Mat4.translate(projectionMatrix,
+      imageExtent[0] - viewCenter[0],
+      imageExtent[1] - viewCenter[1],
+      0);
+  goog.vec.Mat4.scale(projectionMatrix,
+      (imageExtent[2] - imageExtent[0]) / 2,
+      (imageExtent[3] - imageExtent[1]) / 2,
+      1);
+  goog.vec.Mat4.translate(projectionMatrix, 1, 1, 0);
+
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.ImageLayer.prototype.hasFeatureAtCoordinate =
+    function(coordinate, frameState) {
+  var hasFeature = this.forEachFeatureAtCoordinate(
+      coordinate, frameState, goog.functions.TRUE, this);
+  return hasFeature !== undefined;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.ImageLayer.prototype.forEachLayerAtPixel =
+    function(pixel, frameState, callback, thisArg) {
+  if (!this.image_ || !this.image_.getImage()) {
+    return undefined;
+  }
+
+  if (this.getLayer().getSource() instanceof ol.source.ImageVector) {
+    // for ImageVector sources use the original hit-detection logic,
+    // so that for example also transparent polygons are detected
+    var coordinate = pixel.slice();
+    ol.vec.Mat4.multVec2(
+        frameState.pixelToCoordinateMatrix, coordinate, coordinate);
+    var hasFeature = this.forEachFeatureAtCoordinate(
+        coordinate, frameState, goog.functions.TRUE, this);
+
+    if (hasFeature) {
+      return callback.call(thisArg, this.getLayer());
+    } else {
+      return undefined;
+    }
+  } else {
+    var imageSize =
+        [this.image_.getImage().width, this.image_.getImage().height];
+
+    if (!this.hitTransformationMatrix_) {
+      this.hitTransformationMatrix_ = this.getHitTransformationMatrix_(
+          frameState.size, imageSize);
+    }
+
+    var pixelOnFrameBuffer = [0, 0];
+    ol.vec.Mat4.multVec2(
+        this.hitTransformationMatrix_, pixel, pixelOnFrameBuffer);
+
+    if (pixelOnFrameBuffer[0] < 0 || pixelOnFrameBuffer[0] > imageSize[0] ||
+        pixelOnFrameBuffer[1] < 0 || pixelOnFrameBuffer[1] > imageSize[1]) {
+      // outside the image, no need to check
+      return undefined;
+    }
+
+    if (!this.hitCanvasContext_) {
+      this.hitCanvasContext_ = ol.dom.createCanvasContext2D(1, 1);
+    }
+
+    this.hitCanvasContext_.clearRect(0, 0, 1, 1);
+    this.hitCanvasContext_.drawImage(this.image_.getImage(),
+        pixelOnFrameBuffer[0], pixelOnFrameBuffer[1], 1, 1, 0, 0, 1, 1);
+
+    var imageData = this.hitCanvasContext_.getImageData(0, 0, 1, 1).data;
+    if (imageData[3] > 0) {
+      return callback.call(thisArg, this.getLayer());
+    } else {
+      return undefined;
+    }
+  }
+};
+
+
+/**
+ * The transformation matrix to get the pixel on the image for a
+ * pixel on the map.
+ * @param {ol.Size} mapSize
+ * @param {ol.Size} imageSize
+ * @return {goog.vec.Mat4.Number}
+ * @private
+ */
+ol.renderer.webgl.ImageLayer.prototype.getHitTransformationMatrix_ =
+    function(mapSize, imageSize) {
+  // the first matrix takes a map pixel, flips the y-axis and scales to
+  // a range between -1 ... 1
+  var mapCoordMatrix = goog.vec.Mat4.createNumber();
+  goog.vec.Mat4.makeIdentity(mapCoordMatrix);
+  goog.vec.Mat4.translate(mapCoordMatrix, -1, -1, 0);
+  goog.vec.Mat4.scale(mapCoordMatrix, 2 / mapSize[0], 2 / mapSize[1], 1);
+  goog.vec.Mat4.translate(mapCoordMatrix, 0, mapSize[1], 0);
+  goog.vec.Mat4.scale(mapCoordMatrix, 1, -1, 1);
+
+  // the second matrix is the inverse of the projection matrix used in the
+  // shader for drawing
+  var projectionMatrixInv = goog.vec.Mat4.createNumber();
+  goog.vec.Mat4.invert(this.projectionMatrix, projectionMatrixInv);
+
+  // the third matrix scales to the image dimensions and flips the y-axis again
+  var imageCoordMatrix = goog.vec.Mat4.createNumber();
+  goog.vec.Mat4.makeIdentity(imageCoordMatrix);
+  goog.vec.Mat4.translate(imageCoordMatrix, 0, imageSize[1], 0);
+  goog.vec.Mat4.scale(imageCoordMatrix, 1, -1, 1);
+  goog.vec.Mat4.scale(imageCoordMatrix, imageSize[0] / 2, imageSize[1] / 2, 1);
+  goog.vec.Mat4.translate(imageCoordMatrix, 1, 1, 0);
+
+  var transformMatrix = goog.vec.Mat4.createNumber();
+  goog.vec.Mat4.multMat(
+      imageCoordMatrix, projectionMatrixInv, transformMatrix);
+  goog.vec.Mat4.multMat(
+      transformMatrix, mapCoordMatrix, transformMatrix);
+
+  return transformMatrix;
+};
+
+// This file is automatically generated, do not edit
+goog.provide('ol.renderer.webgl.tilelayer.shader');
+goog.provide('ol.renderer.webgl.tilelayer.shader.Locations');
+goog.provide('ol.renderer.webgl.tilelayer.shader.Fragment');
+goog.provide('ol.renderer.webgl.tilelayer.shader.Vertex');
+
+goog.require('ol.webgl.shader');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.webgl.shader.Fragment}
+ * @struct
+ */
+ol.renderer.webgl.tilelayer.shader.Fragment = function() {
+  goog.base(this, ol.renderer.webgl.tilelayer.shader.Fragment.SOURCE);
+};
+goog.inherits(ol.renderer.webgl.tilelayer.shader.Fragment, ol.webgl.shader.Fragment);
+goog.addSingletonGetter(ol.renderer.webgl.tilelayer.shader.Fragment);
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.renderer.webgl.tilelayer.shader.Fragment.DEBUG_SOURCE = 'precision mediump float;\nvarying vec2 v_texCoord;\n\n\nuniform sampler2D u_texture;\n\nvoid main(void) {\n  gl_FragColor = texture2D(u_texture, v_texCoord);\n}\n';
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.renderer.webgl.tilelayer.shader.Fragment.OPTIMIZED_SOURCE = 'precision mediump float;varying vec2 a;uniform sampler2D e;void main(void){gl_FragColor=texture2D(e,a);}';
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.renderer.webgl.tilelayer.shader.Fragment.SOURCE = goog.DEBUG ?
+    ol.renderer.webgl.tilelayer.shader.Fragment.DEBUG_SOURCE :
+    ol.renderer.webgl.tilelayer.shader.Fragment.OPTIMIZED_SOURCE;
+
+
+
+/**
+ * @constructor
+ * @extends {ol.webgl.shader.Vertex}
+ * @struct
+ */
+ol.renderer.webgl.tilelayer.shader.Vertex = function() {
+  goog.base(this, ol.renderer.webgl.tilelayer.shader.Vertex.SOURCE);
+};
+goog.inherits(ol.renderer.webgl.tilelayer.shader.Vertex, ol.webgl.shader.Vertex);
+goog.addSingletonGetter(ol.renderer.webgl.tilelayer.shader.Vertex);
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.renderer.webgl.tilelayer.shader.Vertex.DEBUG_SOURCE = 'varying vec2 v_texCoord;\n\n\nattribute vec2 a_position;\nattribute vec2 a_texCoord;\nuniform vec4 u_tileOffset;\n\nvoid main(void) {\n  gl_Position = vec4(a_position * u_tileOffset.xy + u_tileOffset.zw, 0., 1.);\n  v_texCoord = a_texCoord;\n}\n\n\n';
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.renderer.webgl.tilelayer.shader.Vertex.OPTIMIZED_SOURCE = 'varying vec2 a;attribute vec2 b;attribute vec2 c;uniform vec4 d;void main(void){gl_Position=vec4(b*d.xy+d.zw,0.,1.);a=c;}';
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.renderer.webgl.tilelayer.shader.Vertex.SOURCE = goog.DEBUG ?
+    ol.renderer.webgl.tilelayer.shader.Vertex.DEBUG_SOURCE :
+    ol.renderer.webgl.tilelayer.shader.Vertex.OPTIMIZED_SOURCE;
+
+
+
+/**
+ * @constructor
+ * @param {WebGLRenderingContext} gl GL.
+ * @param {WebGLProgram} program Program.
+ * @struct
+ */
+ol.renderer.webgl.tilelayer.shader.Locations = function(gl, program) {
+
+  /**
+   * @type {WebGLUniformLocation}
+   */
+  this.u_texture = gl.getUniformLocation(
+      program, goog.DEBUG ? 'u_texture' : 'e');
+
+  /**
+   * @type {WebGLUniformLocation}
+   */
+  this.u_tileOffset = gl.getUniformLocation(
+      program, goog.DEBUG ? 'u_tileOffset' : 'd');
+
+  /**
+   * @type {number}
+   */
+  this.a_position = gl.getAttribLocation(
+      program, goog.DEBUG ? 'a_position' : 'b');
+
+  /**
+   * @type {number}
+   */
+  this.a_texCoord = gl.getAttribLocation(
+      program, goog.DEBUG ? 'a_texCoord' : 'c');
+};
+
+// FIXME large resolutions lead to too large framebuffers :-(
+// FIXME animated shaders! check in redraw
+
+goog.provide('ol.renderer.webgl.TileLayer');
+
+goog.require('goog.asserts');
+goog.require('goog.vec.Mat4');
+goog.require('goog.vec.Vec4');
+goog.require('goog.webgl');
+goog.require('ol.TileRange');
+goog.require('ol.TileState');
+goog.require('ol.array');
+goog.require('ol.extent');
+goog.require('ol.layer.Tile');
+goog.require('ol.math');
+goog.require('ol.renderer.webgl.Layer');
+goog.require('ol.renderer.webgl.tilelayer.shader.Fragment');
+goog.require('ol.renderer.webgl.tilelayer.shader.Locations');
+goog.require('ol.renderer.webgl.tilelayer.shader.Vertex');
+goog.require('ol.size');
+goog.require('ol.tilecoord');
+goog.require('ol.vec.Mat4');
+goog.require('ol.webgl.Buffer');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.renderer.webgl.Layer}
+ * @param {ol.renderer.webgl.Map} mapRenderer Map renderer.
+ * @param {ol.layer.Tile} tileLayer Tile layer.
+ */
+ol.renderer.webgl.TileLayer = function(mapRenderer, tileLayer) {
+
+  goog.base(this, mapRenderer, tileLayer);
+
+  /**
+   * @private
+   * @type {ol.webgl.shader.Fragment}
+   */
+  this.fragmentShader_ =
+      ol.renderer.webgl.tilelayer.shader.Fragment.getInstance();
+
+  /**
+   * @private
+   * @type {ol.webgl.shader.Vertex}
+   */
+  this.vertexShader_ = ol.renderer.webgl.tilelayer.shader.Vertex.getInstance();
+
+  /**
+   * @private
+   * @type {ol.renderer.webgl.tilelayer.shader.Locations}
+   */
+  this.locations_ = null;
+
+  /**
+   * @private
+   * @type {ol.webgl.Buffer}
+   */
+  this.renderArrayBuffer_ = new ol.webgl.Buffer([
+    0, 0, 0, 1,
+    1, 0, 1, 1,
+    0, 1, 0, 0,
+    1, 1, 1, 0
+  ]);
+
+  /**
+   * @private
+   * @type {ol.TileRange}
+   */
+  this.renderedTileRange_ = null;
+
+  /**
+   * @private
+   * @type {ol.Extent}
+   */
+  this.renderedFramebufferExtent_ = null;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.renderedRevision_ = -1;
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.tmpSize_ = [0, 0];
+
+};
+goog.inherits(ol.renderer.webgl.TileLayer, ol.renderer.webgl.Layer);
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.TileLayer.prototype.disposeInternal = function() {
+  var context = this.mapRenderer.getContext();
+  context.deleteBuffer(this.renderArrayBuffer_);
+  goog.base(this, 'disposeInternal');
+};
+
+
+/**
+ * Create a function that adds loaded tiles to the tile lookup.
+ * @param {ol.source.Tile} source Tile source.
+ * @param {ol.proj.Projection} projection Projection of the tiles.
+ * @param {Object.<number, Object.<string, ol.Tile>>} tiles Lookup of loaded
+ *     tiles by zoom level.
+ * @return {function(number, ol.TileRange):boolean} A function that can be
+ *     called with a zoom level and a tile range to add loaded tiles to the
+ *     lookup.
+ * @protected
+ */
+ol.renderer.webgl.TileLayer.prototype.createLoadedTileFinder =
+    function(source, projection, tiles) {
+  var mapRenderer = this.mapRenderer;
+
+  return (
+      /**
+       * @param {number} zoom Zoom level.
+       * @param {ol.TileRange} tileRange Tile range.
+       * @return {boolean} The tile range is fully loaded.
+       */
+      function(zoom, tileRange) {
+        return source.forEachLoadedTile(projection, zoom,
+                                        tileRange, function(tile) {
+              var loaded = mapRenderer.isTileTextureLoaded(tile);
+              if (loaded) {
+                if (!tiles[zoom]) {
+                  tiles[zoom] = {};
+                }
+                tiles[zoom][tile.tileCoord.toString()] = tile;
+              }
+              return loaded;
+            });
+      });
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.TileLayer.prototype.handleWebGLContextLost = function() {
+  goog.base(this, 'handleWebGLContextLost');
+  this.locations_ = null;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.TileLayer.prototype.prepareFrame =
+    function(frameState, layerState, context) {
+
+  var mapRenderer = this.mapRenderer;
+  var gl = context.getGL();
+
+  var viewState = frameState.viewState;
+  var projection = viewState.projection;
+
+  var tileLayer = this.getLayer();
+  goog.asserts.assertInstanceof(tileLayer, ol.layer.Tile,
+      'layer is an instance of ol.layer.Tile');
+  var tileSource = tileLayer.getSource();
+  var tileGrid = tileSource.getTileGridForProjection(projection);
+  var z = tileGrid.getZForResolution(viewState.resolution);
+  var tileResolution = tileGrid.getResolution(z);
+
+  var tilePixelSize =
+      tileSource.getTilePixelSize(z, frameState.pixelRatio, projection);
+  var pixelRatio = tilePixelSize[0] /
+      ol.size.toSize(tileGrid.getTileSize(z), this.tmpSize_)[0];
+  var tilePixelResolution = tileResolution / pixelRatio;
+  var tileGutter = tileSource.getGutter();
+
+  var center = viewState.center;
+  var extent;
+  if (tileResolution == viewState.resolution) {
+    center = this.snapCenterToPixel(center, tileResolution, frameState.size);
+    extent = ol.extent.getForViewAndSize(
+        center, tileResolution, viewState.rotation, frameState.size);
+  } else {
+    extent = frameState.extent;
+  }
+  var tileRange = tileGrid.getTileRangeForExtentAndResolution(
+      extent, tileResolution);
+
+  var framebufferExtent;
+  if (this.renderedTileRange_ &&
+      this.renderedTileRange_.equals(tileRange) &&
+      this.renderedRevision_ == tileSource.getRevision()) {
+    framebufferExtent = this.renderedFramebufferExtent_;
+  } else {
+
+    var tileRangeSize = tileRange.getSize();
+
+    var maxDimension = Math.max(
+        tileRangeSize[0] * tilePixelSize[0],
+        tileRangeSize[1] * tilePixelSize[1]);
+    var framebufferDimension = ol.math.roundUpToPowerOfTwo(maxDimension);
+    var framebufferExtentDimension = tilePixelResolution * framebufferDimension;
+    var origin = tileGrid.getOrigin(z);
+    var minX = origin[0] +
+        tileRange.minX * tilePixelSize[0] * tilePixelResolution;
+    var minY = origin[1] +
+        tileRange.minY * tilePixelSize[1] * tilePixelResolution;
+    framebufferExtent = [
+      minX, minY,
+      minX + framebufferExtentDimension, minY + framebufferExtentDimension
+    ];
+
+    this.bindFramebuffer(frameState, framebufferDimension);
+    gl.viewport(0, 0, framebufferDimension, framebufferDimension);
+
+    gl.clearColor(0, 0, 0, 0);
+    gl.clear(goog.webgl.COLOR_BUFFER_BIT);
+    gl.disable(goog.webgl.BLEND);
+
+    var program = context.getProgram(this.fragmentShader_, this.vertexShader_);
+    context.useProgram(program);
+    if (!this.locations_) {
+      this.locations_ =
+          new ol.renderer.webgl.tilelayer.shader.Locations(gl, program);
+    }
+
+    context.bindBuffer(goog.webgl.ARRAY_BUFFER, this.renderArrayBuffer_);
+    gl.enableVertexAttribArray(this.locations_.a_position);
+    gl.vertexAttribPointer(
+        this.locations_.a_position, 2, goog.webgl.FLOAT, false, 16, 0);
+    gl.enableVertexAttribArray(this.locations_.a_texCoord);
+    gl.vertexAttribPointer(
+        this.locations_.a_texCoord, 2, goog.webgl.FLOAT, false, 16, 8);
+    gl.uniform1i(this.locations_.u_texture, 0);
+
+    /**
+     * @type {Object.<number, Object.<string, ol.Tile>>}
+     */
+    var tilesToDrawByZ = {};
+    tilesToDrawByZ[z] = {};
+
+    var findLoadedTiles = this.createLoadedTileFinder(
+        tileSource, projection, tilesToDrawByZ);
+
+    var useInterimTilesOnError = tileLayer.getUseInterimTilesOnError();
+    var allTilesLoaded = true;
+    var tmpExtent = ol.extent.createEmpty();
+    var tmpTileRange = new ol.TileRange(0, 0, 0, 0);
+    var childTileRange, drawable, fullyLoaded, tile, tileState;
+    var x, y, tileExtent;
+    for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
+      for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
+
+        tile = tileSource.getTile(z, x, y, pixelRatio, projection);
+        if (layerState.extent !== undefined) {
+          // ignore tiles outside layer extent
+          tileExtent = tileGrid.getTileCoordExtent(tile.tileCoord, tmpExtent);
+          if (!ol.extent.intersects(tileExtent, layerState.extent)) {
+            continue;
+          }
+        }
+        tileState = tile.getState();
+        drawable = tileState == ol.TileState.LOADED ||
+            tileState == ol.TileState.EMPTY ||
+            tileState == ol.TileState.ERROR && !useInterimTilesOnError;
+        if (!drawable && tile.interimTile) {
+          tile = tile.interimTile;
+        }
+        goog.asserts.assert(tile);
+        tileState = tile.getState();
+        if (tileState == ol.TileState.LOADED) {
+          if (mapRenderer.isTileTextureLoaded(tile)) {
+            tilesToDrawByZ[z][ol.tilecoord.toString(tile.tileCoord)] = tile;
+            continue;
+          }
+        } else if (tileState == ol.TileState.EMPTY ||
+                   (tileState == ol.TileState.ERROR &&
+                    !useInterimTilesOnError)) {
+          continue;
+        }
+
+        allTilesLoaded = false;
+        fullyLoaded = tileGrid.forEachTileCoordParentTileRange(
+            tile.tileCoord, findLoadedTiles, null, tmpTileRange, tmpExtent);
+        if (!fullyLoaded) {
+          childTileRange = tileGrid.getTileCoordChildTileRange(
+              tile.tileCoord, tmpTileRange, tmpExtent);
+          if (childTileRange) {
+            findLoadedTiles(z + 1, childTileRange);
+          }
+        }
+
+      }
+
+    }
+
+    /** @type {Array.<number>} */
+    var zs = Object.keys(tilesToDrawByZ).map(Number);
+    zs.sort(ol.array.numberSafeCompareFunction);
+    var u_tileOffset = goog.vec.Vec4.createFloat32();
+    var i, ii, sx, sy, tileKey, tilesToDraw, tx, ty;
+    for (i = 0, ii = zs.length; i < ii; ++i) {
+      tilesToDraw = tilesToDrawByZ[zs[i]];
+      for (tileKey in tilesToDraw) {
+        tile = tilesToDraw[tileKey];
+        tileExtent = tileGrid.getTileCoordExtent(tile.tileCoord, tmpExtent);
+        sx = 2 * (tileExtent[2] - tileExtent[0]) /
+            framebufferExtentDimension;
+        sy = 2 * (tileExtent[3] - tileExtent[1]) /
+            framebufferExtentDimension;
+        tx = 2 * (tileExtent[0] - framebufferExtent[0]) /
+            framebufferExtentDimension - 1;
+        ty = 2 * (tileExtent[1] - framebufferExtent[1]) /
+            framebufferExtentDimension - 1;
+        goog.vec.Vec4.setFromValues(u_tileOffset, sx, sy, tx, ty);
+        gl.uniform4fv(this.locations_.u_tileOffset, u_tileOffset);
+        mapRenderer.bindTileTexture(tile, tilePixelSize,
+            tileGutter * pixelRatio, goog.webgl.LINEAR, goog.webgl.LINEAR);
+        gl.drawArrays(goog.webgl.TRIANGLE_STRIP, 0, 4);
+      }
+    }
+
+    if (allTilesLoaded) {
+      this.renderedTileRange_ = tileRange;
+      this.renderedFramebufferExtent_ = framebufferExtent;
+      this.renderedRevision_ = tileSource.getRevision();
+    } else {
+      this.renderedTileRange_ = null;
+      this.renderedFramebufferExtent_ = null;
+      this.renderedRevision_ = -1;
+      frameState.animate = true;
+    }
+
+  }
+
+  this.updateUsedTiles(frameState.usedTiles, tileSource, z, tileRange);
+  var tileTextureQueue = mapRenderer.getTileTextureQueue();
+  this.manageTilePyramid(
+      frameState, tileSource, tileGrid, pixelRatio, projection, extent, z,
+      tileLayer.getPreload(),
+      /**
+       * @param {ol.Tile} tile Tile.
+       */
+      function(tile) {
+        if (tile.getState() == ol.TileState.LOADED &&
+            !mapRenderer.isTileTextureLoaded(tile) &&
+            !tileTextureQueue.isKeyQueued(tile.getKey())) {
+          tileTextureQueue.enqueue([
+            tile,
+            tileGrid.getTileCoordCenter(tile.tileCoord),
+            tileGrid.getResolution(tile.tileCoord[0]),
+            tilePixelSize, tileGutter * pixelRatio
+          ]);
+        }
+      }, this);
+  this.scheduleExpireCache(frameState, tileSource);
+  this.updateLogos(frameState, tileSource);
+
+  var texCoordMatrix = this.texCoordMatrix;
+  goog.vec.Mat4.makeIdentity(texCoordMatrix);
+  goog.vec.Mat4.translate(texCoordMatrix,
+      (center[0] - framebufferExtent[0]) /
+          (framebufferExtent[2] - framebufferExtent[0]),
+      (center[1] - framebufferExtent[1]) /
+          (framebufferExtent[3] - framebufferExtent[1]),
+      0);
+  if (viewState.rotation !== 0) {
+    goog.vec.Mat4.rotateZ(texCoordMatrix, viewState.rotation);
+  }
+  goog.vec.Mat4.scale(texCoordMatrix,
+      frameState.size[0] * viewState.resolution /
+          (framebufferExtent[2] - framebufferExtent[0]),
+      frameState.size[1] * viewState.resolution /
+          (framebufferExtent[3] - framebufferExtent[1]),
+      1);
+  goog.vec.Mat4.translate(texCoordMatrix,
+      -0.5,
+      -0.5,
+      0);
+
+  return true;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.TileLayer.prototype.forEachLayerAtPixel =
+    function(pixel, frameState, callback, thisArg) {
+  if (!this.framebuffer) {
+    return undefined;
+  }
+
+  var pixelOnMapScaled = [
+    pixel[0] / frameState.size[0],
+    (frameState.size[1] - pixel[1]) / frameState.size[1]];
+
+  var pixelOnFrameBufferScaled = [0, 0];
+  ol.vec.Mat4.multVec2(
+      this.texCoordMatrix, pixelOnMapScaled, pixelOnFrameBufferScaled);
+  var pixelOnFrameBuffer = [
+    pixelOnFrameBufferScaled[0] * this.framebufferDimension,
+    pixelOnFrameBufferScaled[1] * this.framebufferDimension];
+
+  var gl = this.mapRenderer.getContext().getGL();
+  gl.bindFramebuffer(gl.FRAMEBUFFER, this.framebuffer);
+  var imageData = new Uint8Array(4);
+  gl.readPixels(pixelOnFrameBuffer[0], pixelOnFrameBuffer[1], 1, 1,
+      gl.RGBA, gl.UNSIGNED_BYTE, imageData);
+
+  if (imageData[3] > 0) {
+    return callback.call(thisArg, this.getLayer());
+  } else {
+    return undefined;
+  }
+};
+
+goog.provide('ol.renderer.webgl.VectorLayer');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('ol.ViewHint');
+goog.require('ol.extent');
+goog.require('ol.layer.Vector');
+goog.require('ol.render.webgl.ReplayGroup');
+goog.require('ol.renderer.vector');
+goog.require('ol.renderer.webgl.Layer');
+goog.require('ol.vec.Mat4');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.renderer.webgl.Layer}
+ * @param {ol.renderer.webgl.Map} mapRenderer Map renderer.
+ * @param {ol.layer.Vector} vectorLayer Vector layer.
+ */
+ol.renderer.webgl.VectorLayer = function(mapRenderer, vectorLayer) {
+
+  goog.base(this, mapRenderer, vectorLayer);
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.dirty_ = false;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.renderedRevision_ = -1;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.renderedResolution_ = NaN;
+
+  /**
+   * @private
+   * @type {ol.Extent}
+   */
+  this.renderedExtent_ = ol.extent.createEmpty();
+
+  /**
+   * @private
+   * @type {function(ol.Feature, ol.Feature): number|null}
+   */
+  this.renderedRenderOrder_ = null;
+
+  /**
+   * @private
+   * @type {ol.render.webgl.ReplayGroup}
+   */
+  this.replayGroup_ = null;
+
+  /**
+   * The last layer state.
+   * @private
+   * @type {?ol.layer.LayerState}
+   */
+  this.layerState_ = null;
+
+};
+goog.inherits(ol.renderer.webgl.VectorLayer, ol.renderer.webgl.Layer);
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.VectorLayer.prototype.composeFrame =
+    function(frameState, layerState, context) {
+  this.layerState_ = layerState;
+  var viewState = frameState.viewState;
+  var replayGroup = this.replayGroup_;
+  if (replayGroup && !replayGroup.isEmpty()) {
+    replayGroup.replay(context,
+        viewState.center, viewState.resolution, viewState.rotation,
+        frameState.size, frameState.pixelRatio, layerState.opacity,
+        layerState.managed ? frameState.skippedFeatureUids : {});
+  }
+
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.VectorLayer.prototype.disposeInternal = function() {
+  var replayGroup = this.replayGroup_;
+  if (replayGroup) {
+    var context = this.mapRenderer.getContext();
+    replayGroup.getDeleteResourcesFunction(context)();
+    this.replayGroup_ = null;
+  }
+  goog.base(this, 'disposeInternal');
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.VectorLayer.prototype.forEachFeatureAtCoordinate =
+    function(coordinate, frameState, callback, thisArg) {
+  if (!this.replayGroup_ || !this.layerState_) {
+    return undefined;
+  } else {
+    var context = this.mapRenderer.getContext();
+    var viewState = frameState.viewState;
+    var layer = this.getLayer();
+    var layerState = this.layerState_;
+    /** @type {Object.<string, boolean>} */
+    var features = {};
+    return this.replayGroup_.forEachFeatureAtCoordinate(coordinate,
+        context, viewState.center, viewState.resolution, viewState.rotation,
+        frameState.size, frameState.pixelRatio, layerState.opacity,
+        layerState.managed ? frameState.skippedFeatureUids : {},
+        /**
+         * @param {ol.Feature} feature Feature.
+         * @return {?} Callback result.
+         */
+        function(feature) {
+          goog.asserts.assert(feature !== undefined, 'received a feature');
+          var key = goog.getUid(feature).toString();
+          if (!(key in features)) {
+            features[key] = true;
+            return callback.call(thisArg, feature, layer);
+          }
+        });
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.VectorLayer.prototype.hasFeatureAtCoordinate =
+    function(coordinate, frameState) {
+  if (!this.replayGroup_ || !this.layerState_) {
+    return false;
+  } else {
+    var context = this.mapRenderer.getContext();
+    var viewState = frameState.viewState;
+    var layerState = this.layerState_;
+    return this.replayGroup_.hasFeatureAtCoordinate(coordinate,
+        context, viewState.center, viewState.resolution, viewState.rotation,
+        frameState.size, frameState.pixelRatio, layerState.opacity,
+        frameState.skippedFeatureUids);
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.VectorLayer.prototype.forEachLayerAtPixel =
+    function(pixel, frameState, callback, thisArg) {
+  var coordinate = pixel.slice();
+  ol.vec.Mat4.multVec2(
+      frameState.pixelToCoordinateMatrix, coordinate, coordinate);
+  var hasFeature = this.hasFeatureAtCoordinate(coordinate, frameState);
+
+  if (hasFeature) {
+    return callback.call(thisArg, this.getLayer());
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * Handle changes in image style state.
+ * @param {goog.events.Event} event Image style change event.
+ * @private
+ */
+ol.renderer.webgl.VectorLayer.prototype.handleStyleImageChange_ =
+    function(event) {
+  this.renderIfReadyAndVisible();
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.VectorLayer.prototype.prepareFrame =
+    function(frameState, layerState, context) {
+
+  var vectorLayer = /** @type {ol.layer.Vector} */ (this.getLayer());
+  goog.asserts.assertInstanceof(vectorLayer, ol.layer.Vector,
+      'layer is an instance of ol.layer.Vector');
+  var vectorSource = vectorLayer.getSource();
+
+  this.updateAttributions(
+      frameState.attributions, vectorSource.getAttributions());
+  this.updateLogos(frameState, vectorSource);
+
+  var animating = frameState.viewHints[ol.ViewHint.ANIMATING];
+  var interacting = frameState.viewHints[ol.ViewHint.INTERACTING];
+  var updateWhileAnimating = vectorLayer.getUpdateWhileAnimating();
+  var updateWhileInteracting = vectorLayer.getUpdateWhileInteracting();
+
+  if (!this.dirty_ && (!updateWhileAnimating && animating) ||
+      (!updateWhileInteracting && interacting)) {
+    return true;
+  }
+
+  var frameStateExtent = frameState.extent;
+  var viewState = frameState.viewState;
+  var projection = viewState.projection;
+  var resolution = viewState.resolution;
+  var pixelRatio = frameState.pixelRatio;
+  var vectorLayerRevision = vectorLayer.getRevision();
+  var vectorLayerRenderBuffer = vectorLayer.getRenderBuffer();
+  var vectorLayerRenderOrder = vectorLayer.getRenderOrder();
+
+  if (vectorLayerRenderOrder === undefined) {
+    vectorLayerRenderOrder = ol.renderer.vector.defaultOrder;
+  }
+
+  var extent = ol.extent.buffer(frameStateExtent,
+      vectorLayerRenderBuffer * resolution);
+
+  if (!this.dirty_ &&
+      this.renderedResolution_ == resolution &&
+      this.renderedRevision_ == vectorLayerRevision &&
+      this.renderedRenderOrder_ == vectorLayerRenderOrder &&
+      ol.extent.containsExtent(this.renderedExtent_, extent)) {
+    return true;
+  }
+
+  if (this.replayGroup_) {
+    frameState.postRenderFunctions.push(
+        this.replayGroup_.getDeleteResourcesFunction(context));
+  }
+
+  this.dirty_ = false;
+
+  var replayGroup = new ol.render.webgl.ReplayGroup(
+      ol.renderer.vector.getTolerance(resolution, pixelRatio),
+      extent, vectorLayer.getRenderBuffer());
+  vectorSource.loadFeatures(extent, resolution, projection);
+  var renderFeature =
+      /**
+       * @param {ol.Feature} feature Feature.
+       * @this {ol.renderer.webgl.VectorLayer}
+       */
+      function(feature) {
+    var styles;
+    var styleFunction = feature.getStyleFunction();
+    if (styleFunction) {
+      styles = styleFunction.call(feature, resolution);
+    } else {
+      styleFunction = vectorLayer.getStyleFunction();
+      if (styleFunction) {
+        styles = styleFunction(feature, resolution);
+      }
+    }
+    if (styles) {
+      var dirty = this.renderFeature(
+          feature, resolution, pixelRatio, styles, replayGroup);
+      this.dirty_ = this.dirty_ || dirty;
+    }
+  };
+  if (vectorLayerRenderOrder) {
+    /** @type {Array.<ol.Feature>} */
+    var features = [];
+    vectorSource.forEachFeatureInExtent(extent,
+        /**
+         * @param {ol.Feature} feature Feature.
+         */
+        function(feature) {
+          features.push(feature);
+        }, this);
+    features.sort(vectorLayerRenderOrder);
+    features.forEach(renderFeature, this);
+  } else {
+    vectorSource.forEachFeatureInExtent(extent, renderFeature, this);
+  }
+  replayGroup.finish(context);
+
+  this.renderedResolution_ = resolution;
+  this.renderedRevision_ = vectorLayerRevision;
+  this.renderedRenderOrder_ = vectorLayerRenderOrder;
+  this.renderedExtent_ = extent;
+  this.replayGroup_ = replayGroup;
+
+  return true;
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature.
+ * @param {number} resolution Resolution.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {(ol.style.Style|Array.<ol.style.Style>)} styles The style or array of
+ *     styles.
+ * @param {ol.render.webgl.ReplayGroup} replayGroup Replay group.
+ * @return {boolean} `true` if an image is loading.
+ */
+ol.renderer.webgl.VectorLayer.prototype.renderFeature =
+    function(feature, resolution, pixelRatio, styles, replayGroup) {
+  if (!styles) {
+    return false;
+  }
+  var loading = false;
+  if (goog.isArray(styles)) {
+    for (var i = 0, ii = styles.length; i < ii; ++i) {
+      loading = ol.renderer.vector.renderFeature(
+          replayGroup, feature, styles[i],
+          ol.renderer.vector.getSquaredTolerance(resolution, pixelRatio),
+          this.handleStyleImageChange_, this) || loading;
+    }
+  } else {
+    loading = ol.renderer.vector.renderFeature(
+        replayGroup, feature, styles,
+        ol.renderer.vector.getSquaredTolerance(resolution, pixelRatio),
+        this.handleStyleImageChange_, this) || loading;
+  }
+  return loading;
+};
+
+// FIXME check against gl.getParameter(webgl.MAX_TEXTURE_SIZE)
+
+goog.provide('ol.renderer.webgl.Map');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.dom');
+goog.require('goog.events');
+goog.require('goog.events.Event');
+goog.require('goog.log');
+goog.require('goog.log.Logger');
+goog.require('goog.object');
+goog.require('goog.style');
+goog.require('goog.webgl');
+goog.require('ol');
+goog.require('ol.RendererType');
+goog.require('ol.css');
+goog.require('ol.dom');
+goog.require('ol.layer.Image');
+goog.require('ol.layer.Layer');
+goog.require('ol.layer.Tile');
+goog.require('ol.layer.Vector');
+goog.require('ol.render.Event');
+goog.require('ol.render.EventType');
+goog.require('ol.render.webgl.Immediate');
+goog.require('ol.renderer.Map');
+goog.require('ol.renderer.webgl.ImageLayer');
+goog.require('ol.renderer.webgl.Layer');
+goog.require('ol.renderer.webgl.TileLayer');
+goog.require('ol.renderer.webgl.VectorLayer');
+goog.require('ol.source.State');
+goog.require('ol.structs.LRUCache');
+goog.require('ol.structs.PriorityQueue');
+goog.require('ol.webgl');
+goog.require('ol.webgl.Context');
+goog.require('ol.webgl.WebGLContextEventType');
+
+
+/**
+ * @typedef {{magFilter: number, minFilter: number, texture: WebGLTexture}}
+ */
+ol.renderer.webgl.TextureCacheEntry;
+
+
+
+/**
+ * @constructor
+ * @extends {ol.renderer.Map}
+ * @param {Element} container Container.
+ * @param {ol.Map} map Map.
+ */
+ol.renderer.webgl.Map = function(container, map) {
+
+  goog.base(this, container, map);
+
+  /**
+   * @private
+   * @type {HTMLCanvasElement}
+   */
+  this.canvas_ = /** @type {HTMLCanvasElement} */
+      (document.createElement('CANVAS'));
+  this.canvas_.style.width = '100%';
+  this.canvas_.style.height = '100%';
+  this.canvas_.className = ol.css.CLASS_UNSELECTABLE;
+  goog.dom.insertChildAt(container, this.canvas_, 0);
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.clipTileCanvasWidth_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.clipTileCanvasHeight_ = 0;
+
+  /**
+   * @private
+   * @type {CanvasRenderingContext2D}
+   */
+  this.clipTileContext_ = ol.dom.createCanvasContext2D();
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.renderedVisible_ = true;
+
+  /**
+   * @private
+   * @type {WebGLRenderingContext}
+   */
+  this.gl_ = ol.webgl.getContext(this.canvas_, {
+    antialias: true,
+    depth: false,
+    failIfMajorPerformanceCaveat: true,
+    preserveDrawingBuffer: false,
+    stencil: true
+  });
+  goog.asserts.assert(this.gl_, 'got a WebGLRenderingContext');
+
+  /**
+   * @private
+   * @type {ol.webgl.Context}
+   */
+  this.context_ = new ol.webgl.Context(this.canvas_, this.gl_);
+
+  goog.events.listen(this.canvas_, ol.webgl.WebGLContextEventType.LOST,
+      this.handleWebGLContextLost, false, this);
+  goog.events.listen(this.canvas_, ol.webgl.WebGLContextEventType.RESTORED,
+      this.handleWebGLContextRestored, false, this);
+
+  /**
+   * @private
+   * @type {ol.structs.LRUCache.<ol.renderer.webgl.TextureCacheEntry|null>}
+   */
+  this.textureCache_ = new ol.structs.LRUCache();
+
+  /**
+   * @private
+   * @type {ol.Coordinate}
+   */
+  this.focus_ = null;
+
+  /**
+   * @private
+   * @type {ol.structs.PriorityQueue.<Array>}
+   */
+  this.tileTextureQueue_ = new ol.structs.PriorityQueue(
+      goog.bind(
+          /**
+           * @param {Array.<*>} element Element.
+           * @return {number} Priority.
+           * @this {ol.renderer.webgl.Map}
+           */
+          function(element) {
+            var tileCenter = /** @type {ol.Coordinate} */ (element[1]);
+            var tileResolution = /** @type {number} */ (element[2]);
+            var deltaX = tileCenter[0] - this.focus_[0];
+            var deltaY = tileCenter[1] - this.focus_[1];
+            return 65536 * Math.log(tileResolution) +
+                Math.sqrt(deltaX * deltaX + deltaY * deltaY) / tileResolution;
+          }, this),
+      /**
+       * @param {Array.<*>} element Element.
+       * @return {string} Key.
+       */
+      function(element) {
+        return /** @type {ol.Tile} */ (element[0]).getKey();
+      });
+
+  /**
+   * @private
+   * @type {ol.PostRenderFunction}
+   */
+  this.loadNextTileTexture_ = goog.bind(
+      function(map, frameState) {
+        if (!this.tileTextureQueue_.isEmpty()) {
+          this.tileTextureQueue_.reprioritize();
+          var element = this.tileTextureQueue_.dequeue();
+          var tile = /** @type {ol.Tile} */ (element[0]);
+          var tileSize = /** @type {ol.Size} */ (element[3]);
+          var tileGutter = /** @type {number} */ (element[4]);
+          this.bindTileTexture(
+              tile, tileSize, tileGutter, goog.webgl.LINEAR, goog.webgl.LINEAR);
+        }
+      }, this);
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.textureCacheFrameMarkerCount_ = 0;
+
+  this.initializeGL_();
+
+};
+goog.inherits(ol.renderer.webgl.Map, ol.renderer.Map);
+
+
+/**
+ * @param {ol.Tile} tile Tile.
+ * @param {ol.Size} tileSize Tile size.
+ * @param {number} tileGutter Tile gutter.
+ * @param {number} magFilter Mag filter.
+ * @param {number} minFilter Min filter.
+ */
+ol.renderer.webgl.Map.prototype.bindTileTexture =
+    function(tile, tileSize, tileGutter, magFilter, minFilter) {
+  var gl = this.getGL();
+  var tileKey = tile.getKey();
+  if (this.textureCache_.containsKey(tileKey)) {
+    var textureCacheEntry = this.textureCache_.get(tileKey);
+    goog.asserts.assert(textureCacheEntry,
+        'a texture cache entry exists for key %s', tileKey);
+    gl.bindTexture(goog.webgl.TEXTURE_2D, textureCacheEntry.texture);
+    if (textureCacheEntry.magFilter != magFilter) {
+      gl.texParameteri(
+          goog.webgl.TEXTURE_2D, goog.webgl.TEXTURE_MAG_FILTER, magFilter);
+      textureCacheEntry.magFilter = magFilter;
+    }
+    if (textureCacheEntry.minFilter != minFilter) {
+      gl.texParameteri(
+          goog.webgl.TEXTURE_2D, goog.webgl.TEXTURE_MAG_FILTER, minFilter);
+      textureCacheEntry.minFilter = minFilter;
+    }
+  } else {
+    var texture = gl.createTexture();
+    gl.bindTexture(goog.webgl.TEXTURE_2D, texture);
+    if (tileGutter > 0) {
+      var clipTileCanvas = this.clipTileContext_.canvas;
+      var clipTileContext = this.clipTileContext_;
+      if (this.clipTileCanvasWidth_ !== tileSize[0] ||
+          this.clipTileCanvasHeight_ !== tileSize[1]) {
+        clipTileCanvas.width = tileSize[0];
+        clipTileCanvas.height = tileSize[1];
+        this.clipTileCanvasWidth_ = tileSize[0];
+        this.clipTileCanvasHeight_ = tileSize[1];
+      } else {
+        clipTileContext.clearRect(0, 0, tileSize[0], tileSize[1]);
+      }
+      clipTileContext.drawImage(tile.getImage(), tileGutter, tileGutter,
+          tileSize[0], tileSize[1], 0, 0, tileSize[0], tileSize[1]);
+      gl.texImage2D(goog.webgl.TEXTURE_2D, 0,
+          goog.webgl.RGBA, goog.webgl.RGBA,
+          goog.webgl.UNSIGNED_BYTE, clipTileCanvas);
+    } else {
+      gl.texImage2D(goog.webgl.TEXTURE_2D, 0,
+          goog.webgl.RGBA, goog.webgl.RGBA,
+          goog.webgl.UNSIGNED_BYTE, tile.getImage());
+    }
+    gl.texParameteri(
+        goog.webgl.TEXTURE_2D, goog.webgl.TEXTURE_MAG_FILTER, magFilter);
+    gl.texParameteri(
+        goog.webgl.TEXTURE_2D, goog.webgl.TEXTURE_MIN_FILTER, minFilter);
+    gl.texParameteri(goog.webgl.TEXTURE_2D, goog.webgl.TEXTURE_WRAP_S,
+        goog.webgl.CLAMP_TO_EDGE);
+    gl.texParameteri(goog.webgl.TEXTURE_2D, goog.webgl.TEXTURE_WRAP_T,
+        goog.webgl.CLAMP_TO_EDGE);
+    this.textureCache_.set(tileKey, {
+      texture: texture,
+      magFilter: magFilter,
+      minFilter: minFilter
+    });
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.Map.prototype.createLayerRenderer = function(layer) {
+  if (ol.ENABLE_IMAGE && layer instanceof ol.layer.Image) {
+    return new ol.renderer.webgl.ImageLayer(this, layer);
+  } else if (ol.ENABLE_TILE && layer instanceof ol.layer.Tile) {
+    return new ol.renderer.webgl.TileLayer(this, layer);
+  } else if (ol.ENABLE_VECTOR && layer instanceof ol.layer.Vector) {
+    return new ol.renderer.webgl.VectorLayer(this, layer);
+  } else {
+    goog.asserts.fail('unexpected layer configuration');
+    return null;
+  }
+};
+
+
+/**
+ * @param {ol.render.EventType} type Event type.
+ * @param {olx.FrameState} frameState Frame state.
+ * @private
+ */
+ol.renderer.webgl.Map.prototype.dispatchComposeEvent_ =
+    function(type, frameState) {
+  var map = this.getMap();
+  if (map.hasListener(type)) {
+    var context = this.context_;
+
+    var extent = frameState.extent;
+    var size = frameState.size;
+    var viewState = frameState.viewState;
+    var pixelRatio = frameState.pixelRatio;
+
+    var resolution = viewState.resolution;
+    var center = viewState.center;
+    var rotation = viewState.rotation;
+
+    var vectorContext = new ol.render.webgl.Immediate(context,
+        center, resolution, rotation, size, extent, pixelRatio);
+    var composeEvent = new ol.render.Event(type, map, vectorContext,
+        frameState, null, context);
+    map.dispatchEvent(composeEvent);
+
+    vectorContext.flush();
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.Map.prototype.disposeInternal = function() {
+  var gl = this.getGL();
+  if (!gl.isContextLost()) {
+    this.textureCache_.forEach(
+        /**
+         * @param {?ol.renderer.webgl.TextureCacheEntry} textureCacheEntry
+         *     Texture cache entry.
+         */
+        function(textureCacheEntry) {
+          if (textureCacheEntry) {
+            gl.deleteTexture(textureCacheEntry.texture);
+          }
+        });
+  }
+  goog.dispose(this.context_);
+  goog.base(this, 'disposeInternal');
+};
+
+
+/**
+ * @param {ol.Map} map Map.
+ * @param {olx.FrameState} frameState Frame state.
+ * @private
+ */
+ol.renderer.webgl.Map.prototype.expireCache_ = function(map, frameState) {
+  var gl = this.getGL();
+  var textureCacheEntry;
+  while (this.textureCache_.getCount() - this.textureCacheFrameMarkerCount_ >
+      ol.WEBGL_TEXTURE_CACHE_HIGH_WATER_MARK) {
+    textureCacheEntry = this.textureCache_.peekLast();
+    if (!textureCacheEntry) {
+      if (+this.textureCache_.peekLastKey() == frameState.index) {
+        break;
+      } else {
+        --this.textureCacheFrameMarkerCount_;
+      }
+    } else {
+      gl.deleteTexture(textureCacheEntry.texture);
+    }
+    this.textureCache_.pop();
+  }
+};
+
+
+/**
+ * @return {ol.webgl.Context}
+ */
+ol.renderer.webgl.Map.prototype.getContext = function() {
+  return this.context_;
+};
+
+
+/**
+ * @return {WebGLRenderingContext} GL.
+ */
+ol.renderer.webgl.Map.prototype.getGL = function() {
+  return this.gl_;
+};
+
+
+/**
+ * @return {ol.structs.PriorityQueue.<Array>} Tile texture queue.
+ */
+ol.renderer.webgl.Map.prototype.getTileTextureQueue = function() {
+  return this.tileTextureQueue_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.Map.prototype.getType = function() {
+  return ol.RendererType.WEBGL;
+};
+
+
+/**
+ * @param {goog.events.Event} event Event.
+ * @protected
+ */
+ol.renderer.webgl.Map.prototype.handleWebGLContextLost = function(event) {
+  event.preventDefault();
+  this.textureCache_.clear();
+  this.textureCacheFrameMarkerCount_ = 0;
+  goog.object.forEach(this.getLayerRenderers(),
+      /**
+       * @param {ol.renderer.Layer} layerRenderer Layer renderer.
+       * @param {string} key Key.
+       * @param {Object.<string, ol.renderer.Layer>} object Object.
+       */
+      function(layerRenderer, key, object) {
+        goog.asserts.assertInstanceof(layerRenderer, ol.renderer.webgl.Layer,
+            'renderer is an instance of ol.renderer.webgl.Layer');
+        layerRenderer.handleWebGLContextLost();
+      });
+};
+
+
+/**
+ * @protected
+ */
+ol.renderer.webgl.Map.prototype.handleWebGLContextRestored = function() {
+  this.initializeGL_();
+  this.getMap().render();
+};
+
+
+/**
+ * @private
+ */
+ol.renderer.webgl.Map.prototype.initializeGL_ = function() {
+  var gl = this.gl_;
+  gl.activeTexture(goog.webgl.TEXTURE0);
+  gl.blendFuncSeparate(
+      goog.webgl.SRC_ALPHA, goog.webgl.ONE_MINUS_SRC_ALPHA,
+      goog.webgl.ONE, goog.webgl.ONE_MINUS_SRC_ALPHA);
+  gl.disable(goog.webgl.CULL_FACE);
+  gl.disable(goog.webgl.DEPTH_TEST);
+  gl.disable(goog.webgl.SCISSOR_TEST);
+  gl.disable(goog.webgl.STENCIL_TEST);
+};
+
+
+/**
+ * @param {ol.Tile} tile Tile.
+ * @return {boolean} Is tile texture loaded.
+ */
+ol.renderer.webgl.Map.prototype.isTileTextureLoaded = function(tile) {
+  return this.textureCache_.containsKey(tile.getKey());
+};
+
+
+/**
+ * @private
+ * @type {goog.log.Logger}
+ */
+ol.renderer.webgl.Map.prototype.logger_ =
+    goog.log.getLogger('ol.renderer.webgl.Map');
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.Map.prototype.renderFrame = function(frameState) {
+
+  var context = this.getContext();
+  var gl = this.getGL();
+
+  if (gl.isContextLost()) {
+    return false;
+  }
+
+  if (!frameState) {
+    if (this.renderedVisible_) {
+      goog.style.setElementShown(this.canvas_, false);
+      this.renderedVisible_ = false;
+    }
+    return false;
+  }
+
+  this.focus_ = frameState.focus;
+
+  this.textureCache_.set((-frameState.index).toString(), null);
+  ++this.textureCacheFrameMarkerCount_;
+
+  this.dispatchComposeEvent_(ol.render.EventType.PRECOMPOSE, frameState);
+
+  /** @type {Array.<ol.layer.LayerState>} */
+  var layerStatesToDraw = [];
+  var layerStatesArray = frameState.layerStatesArray;
+  goog.array.stableSort(layerStatesArray, ol.renderer.Map.sortByZIndex);
+
+  var viewResolution = frameState.viewState.resolution;
+  var i, ii, layerRenderer, layerState;
+  for (i = 0, ii = layerStatesArray.length; i < ii; ++i) {
+    layerState = layerStatesArray[i];
+    if (ol.layer.Layer.visibleAtResolution(layerState, viewResolution) &&
+        layerState.sourceState == ol.source.State.READY) {
+      layerRenderer = this.getLayerRenderer(layerState.layer);
+      goog.asserts.assertInstanceof(layerRenderer, ol.renderer.webgl.Layer,
+          'renderer is an instance of ol.renderer.webgl.Layer');
+      if (layerRenderer.prepareFrame(frameState, layerState, context)) {
+        layerStatesToDraw.push(layerState);
+      }
+    }
+  }
+
+  var width = frameState.size[0] * frameState.pixelRatio;
+  var height = frameState.size[1] * frameState.pixelRatio;
+  if (this.canvas_.width != width || this.canvas_.height != height) {
+    this.canvas_.width = width;
+    this.canvas_.height = height;
+  }
+
+  gl.bindFramebuffer(goog.webgl.FRAMEBUFFER, null);
+
+  gl.clearColor(0, 0, 0, 0);
+  gl.clear(goog.webgl.COLOR_BUFFER_BIT);
+  gl.enable(goog.webgl.BLEND);
+  gl.viewport(0, 0, this.canvas_.width, this.canvas_.height);
+
+  for (i = 0, ii = layerStatesToDraw.length; i < ii; ++i) {
+    layerState = layerStatesToDraw[i];
+    layerRenderer = this.getLayerRenderer(layerState.layer);
+    goog.asserts.assertInstanceof(layerRenderer, ol.renderer.webgl.Layer,
+        'renderer is an instance of ol.renderer.webgl.Layer');
+    layerRenderer.composeFrame(frameState, layerState, context);
+  }
+
+  if (!this.renderedVisible_) {
+    goog.style.setElementShown(this.canvas_, true);
+    this.renderedVisible_ = true;
+  }
+
+  this.calculateMatrices2D(frameState);
+
+  if (this.textureCache_.getCount() - this.textureCacheFrameMarkerCount_ >
+      ol.WEBGL_TEXTURE_CACHE_HIGH_WATER_MARK) {
+    frameState.postRenderFunctions.push(goog.bind(this.expireCache_, this));
+  }
+
+  if (!this.tileTextureQueue_.isEmpty()) {
+    frameState.postRenderFunctions.push(this.loadNextTileTexture_);
+    frameState.animate = true;
+  }
+
+  this.dispatchComposeEvent_(ol.render.EventType.POSTCOMPOSE, frameState);
+
+  this.scheduleRemoveUnusedLayerRenderers(frameState);
+  this.scheduleExpireIconCache(frameState);
+
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.Map.prototype.forEachFeatureAtCoordinate =
+    function(coordinate, frameState, callback, thisArg,
+        layerFilter, thisArg2) {
+  var result;
+
+  if (this.getGL().isContextLost()) {
+    return false;
+  }
+
+  var viewState = frameState.viewState;
+
+  var layerStates = frameState.layerStatesArray;
+  var numLayers = layerStates.length;
+  var i;
+  for (i = numLayers - 1; i >= 0; --i) {
+    var layerState = layerStates[i];
+    var layer = layerState.layer;
+    if (ol.layer.Layer.visibleAtResolution(layerState, viewState.resolution) &&
+        layerFilter.call(thisArg2, layer)) {
+      var layerRenderer = this.getLayerRenderer(layer);
+      result = layerRenderer.forEachFeatureAtCoordinate(
+          coordinate, frameState, callback, thisArg);
+      if (result) {
+        return result;
+      }
+    }
+  }
+  return undefined;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.Map.prototype.hasFeatureAtCoordinate =
+    function(coordinate, frameState, layerFilter, thisArg) {
+  var hasFeature = false;
+
+  if (this.getGL().isContextLost()) {
+    return false;
+  }
+
+  var viewState = frameState.viewState;
+
+  var layerStates = frameState.layerStatesArray;
+  var numLayers = layerStates.length;
+  var i;
+  for (i = numLayers - 1; i >= 0; --i) {
+    var layerState = layerStates[i];
+    var layer = layerState.layer;
+    if (ol.layer.Layer.visibleAtResolution(layerState, viewState.resolution) &&
+        layerFilter.call(thisArg, layer)) {
+      var layerRenderer = this.getLayerRenderer(layer);
+      hasFeature =
+          layerRenderer.hasFeatureAtCoordinate(coordinate, frameState);
+      if (hasFeature) {
+        return true;
+      }
+    }
+  }
+  return hasFeature;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.Map.prototype.forEachLayerAtPixel =
+    function(pixel, frameState, callback, thisArg,
+        layerFilter, thisArg2) {
+  if (this.getGL().isContextLost()) {
+    return false;
+  }
+
+  var viewState = frameState.viewState;
+  var result;
+
+  var layerStates = frameState.layerStatesArray;
+  var numLayers = layerStates.length;
+  var i;
+  for (i = numLayers - 1; i >= 0; --i) {
+    var layerState = layerStates[i];
+    var layer = layerState.layer;
+    if (ol.layer.Layer.visibleAtResolution(layerState, viewState.resolution) &&
+        layerFilter.call(thisArg, layer)) {
+      var layerRenderer = this.getLayerRenderer(layer);
+      result = layerRenderer.forEachLayerAtPixel(
+          pixel, frameState, callback, thisArg);
+      if (result) {
+        return result;
+      }
+    }
+  }
+  return undefined;
+};
+
+// FIXME recheck layer/map projection compatibility when projection changes
+// FIXME layer renderers should skip when they can't reproject
+// FIXME add tilt and height?
+
+goog.provide('ol.Map');
+goog.provide('ol.MapProperty');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.async.AnimationDelay');
+goog.require('goog.async.nextTick');
+goog.require('goog.debug.Console');
+goog.require('goog.dom');
+goog.require('goog.dom.ViewportSizeMonitor');
+goog.require('goog.dom.classlist');
+goog.require('goog.events');
+goog.require('goog.events.BrowserEvent');
+goog.require('goog.events.Event');
+goog.require('goog.events.EventType');
+goog.require('goog.events.KeyHandler');
+goog.require('goog.events.KeyHandler.EventType');
+goog.require('goog.events.MouseWheelHandler');
+goog.require('goog.events.MouseWheelHandler.EventType');
+goog.require('goog.functions');
+goog.require('goog.log');
+goog.require('goog.log.Level');
+goog.require('goog.object');
+goog.require('goog.style');
+goog.require('goog.vec.Mat4');
+goog.require('ol.Collection');
+goog.require('ol.CollectionEventType');
+goog.require('ol.MapBrowserEvent');
+goog.require('ol.MapBrowserEvent.EventType');
+goog.require('ol.MapBrowserEventHandler');
+goog.require('ol.MapEvent');
+goog.require('ol.MapEventType');
+goog.require('ol.Object');
+goog.require('ol.ObjectEvent');
+goog.require('ol.ObjectEventType');
+goog.require('ol.Pixel');
+goog.require('ol.PostRenderFunction');
+goog.require('ol.PreRenderFunction');
+goog.require('ol.RendererType');
+goog.require('ol.Size');
+goog.require('ol.TileQueue');
+goog.require('ol.View');
+goog.require('ol.ViewHint');
+goog.require('ol.control');
+goog.require('ol.extent');
+goog.require('ol.has');
+goog.require('ol.interaction');
+goog.require('ol.layer.Base');
+goog.require('ol.layer.Group');
+goog.require('ol.proj');
+goog.require('ol.proj.common');
+goog.require('ol.renderer.Map');
+goog.require('ol.renderer.canvas.Map');
+goog.require('ol.renderer.dom.Map');
+goog.require('ol.renderer.webgl.Map');
+goog.require('ol.size');
+goog.require('ol.structs.PriorityQueue');
+goog.require('ol.tilecoord');
+goog.require('ol.vec.Mat4');
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.OL3_URL = 'http://openlayers.org/';
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.OL3_LOGO_URL = 'data:image/png;base64,' +
+    'iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAMAAABEpIrGAAAAA3NCSVQICAjb4U/gAAAACXBI' +
+    'WXMAAAHGAAABxgEXwfpGAAAAGXRFWHRTb2Z0d2FyZQB3d3cuaW5rc2NhcGUub3Jnm+48GgAA' +
+    'AhNQTFRF////AP//AICAgP//AFVVQECA////K1VVSbbbYL/fJ05idsTYJFtbbcjbJllmZszW' +
+    'WMTOIFhoHlNiZszTa9DdUcHNHlNlV8XRIVdiasrUHlZjIVZjaMnVH1RlIFRkH1RkH1ZlasvY' +
+    'asvXVsPQH1VkacnVa8vWIVZjIFRjVMPQa8rXIVVkXsXRsNveIFVkIFZlIVVj3eDeh6GmbMvX' +
+    'H1ZkIFRka8rWbMvXIFVkIFVjIFVkbMvWH1VjbMvWIFVlbcvWIFVla8vVIFVkbMvWbMvVH1Vk' +
+    'bMvWIFVlbcvWIFVkbcvVbMvWjNPbIFVkU8LPwMzNIFVkbczWIFVkbsvWbMvXIFVkRnB8bcvW' +
+    '2+TkW8XRIFVkIlZlJVloJlpoKlxrLl9tMmJwOWd0Omh1RXF8TneCT3iDUHiDU8LPVMLPVcLP' +
+    'VcPQVsPPVsPQV8PQWMTQWsTQW8TQXMXSXsXRX4SNX8bSYMfTYcfTYsfTY8jUZcfSZsnUaIqT' +
+    'acrVasrVa8jTa8rWbI2VbMvWbcvWdJObdcvUdszUd8vVeJaee87Yfc3WgJyjhqGnitDYjaar' +
+    'ldPZnrK2oNbborW5o9bbo9fbpLa6q9ndrL3ArtndscDDutzfu8fJwN7gwt7gxc/QyuHhy+Hi' +
+    'zeHi0NfX0+Pj19zb1+Tj2uXk29/e3uLg3+Lh3+bl4uXj4ufl4+fl5Ofl5ufl5ujm5+jmySDn' +
+    'BAAAAFp0Uk5TAAECAgMEBAYHCA0NDg4UGRogIiMmKSssLzU7PkJJT1JTVFliY2hrdHZ3foSF' +
+    'hYeJjY2QkpugqbG1tre5w8zQ09XY3uXn6+zx8vT09vf4+Pj5+fr6/P39/f3+gz7SsAAAAVVJ' +
+    'REFUOMtjYKA7EBDnwCPLrObS1BRiLoJLnte6CQy8FLHLCzs2QUG4FjZ5GbcmBDDjxJBXDWxC' +
+    'Brb8aM4zbkIDzpLYnAcE9VXlJSWlZRU13koIeW57mGx5XjoMZEUqwxWYQaQbSzLSkYGfKFSe' +
+    '0QMsX5WbjgY0YS4MBplemI4BdGBW+DQ11eZiymfqQuXZIjqwyadPNoSZ4L+0FVM6e+oGI6g8' +
+    'a9iKNT3o8kVzNkzRg5lgl7p4wyRUL9Yt2jAxVh6mQCogae6GmflI8p0r13VFWTHBQ0rWPW7a' +
+    'hgWVcPm+9cuLoyy4kCJDzCm6d8PSFoh0zvQNC5OjDJhQopPPJqph1doJBUD5tnkbZiUEqaCn' +
+    'B3bTqLTFG1bPn71kw4b+GFdpLElKIzRxxgYgWNYc5SCENVHKeUaltHdXx0dZ8uBI1hJ2UUDg' +
+    'q82CM2MwKeibqAvSO7MCABq0wXEPiqWEAAAAAElFTkSuQmCC';
+
+
+/**
+ * @type {Array.<ol.RendererType>}
+ * @const
+ */
+ol.DEFAULT_RENDERER_TYPES = [
+  ol.RendererType.CANVAS,
+  ol.RendererType.WEBGL,
+  ol.RendererType.DOM
+];
+
+
+/**
+ * @enum {string}
+ */
+ol.MapProperty = {
+  LAYERGROUP: 'layergroup',
+  SIZE: 'size',
+  TARGET: 'target',
+  VIEW: 'view'
+};
+
+
+
+/**
+ * @classdesc
+ * The map is the core component of OpenLayers. For a map to render, a view,
+ * one or more layers, and a target container are needed:
+ *
+ *     var map = new ol.Map({
+ *       view: new ol.View({
+ *         center: [0, 0],
+ *         zoom: 1
+ *       }),
+ *       layers: [
+ *         new ol.layer.Tile({
+ *           source: new ol.source.MapQuest({layer: 'osm'})
+ *         })
+ *       ],
+ *       target: 'map'
+ *     });
+ *
+ * The above snippet creates a map using a {@link ol.layer.Tile} to display
+ * {@link ol.source.MapQuest} OSM data and render it to a DOM element with the
+ * id `map`.
+ *
+ * The constructor places a viewport container (with CSS class name
+ * `ol-viewport`) in the target element (see `getViewport()`), and then two
+ * further elements within the viewport: one with CSS class name
+ * `ol-overlaycontainer-stopevent` for controls and some overlays, and one with
+ * CSS class name `ol-overlaycontainer` for other overlays (see the `stopEvent`
+ * option of {@link ol.Overlay} for the difference). The map itself is placed in
+ * a further element within the viewport, either DOM or Canvas, depending on the
+ * renderer.
+ *
+ * Layers are stored as a `ol.Collection` in layerGroups. A top-level group is
+ * provided by the library. This is what is accessed by `getLayerGroup` and
+ * `setLayerGroup`. Layers entered in the options are added to this group, and
+ * `addLayer` and `removeLayer` change the layer collection in the group.
+ * `getLayers` is a convenience function for `getLayerGroup().getLayers()`.
+ * Note that `ol.layer.Group` is a subclass of `ol.layer.Base`, so layers
+ * entered in the options or added with `addLayer` can be groups, which can
+ * contain further groups, and so on.
+ *
+ * @constructor
+ * @extends {ol.Object}
+ * @param {olx.MapOptions} options Map options.
+ * @fires ol.MapBrowserEvent
+ * @fires ol.MapEvent
+ * @fires ol.render.Event#postcompose
+ * @fires ol.render.Event#precompose
+ * @api stable
+ */
+ol.Map = function(options) {
+
+  goog.base(this);
+
+  var optionsInternal = ol.Map.createOptionsInternal(options);
+
+  /**
+   * @type {boolean}
+   * @private
+   */
+  this.loadTilesWhileAnimating_ =
+      options.loadTilesWhileAnimating !== undefined ?
+          options.loadTilesWhileAnimating : false;
+
+  /**
+   * @type {boolean}
+   * @private
+   */
+  this.loadTilesWhileInteracting_ =
+      options.loadTilesWhileInteracting !== undefined ?
+          options.loadTilesWhileInteracting : false;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.pixelRatio_ = options.pixelRatio !== undefined ?
+      options.pixelRatio : ol.has.DEVICE_PIXEL_RATIO;
+
+  /**
+   * @private
+   * @type {Object.<string, string>}
+   */
+  this.logos_ = optionsInternal.logos;
+
+  /**
+   * @private
+   * @type {goog.async.AnimationDelay}
+   */
+  this.animationDelay_ =
+      new goog.async.AnimationDelay(this.renderFrame_, undefined, this);
+  this.registerDisposable(this.animationDelay_);
+
+  /**
+   * @private
+   * @type {goog.vec.Mat4.Number}
+   */
+  this.coordinateToPixelMatrix_ = goog.vec.Mat4.createNumber();
+
+  /**
+   * @private
+   * @type {goog.vec.Mat4.Number}
+   */
+  this.pixelToCoordinateMatrix_ = goog.vec.Mat4.createNumber();
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.frameIndex_ = 0;
+
+  /**
+   * @private
+   * @type {?olx.FrameState}
+   */
+  this.frameState_ = null;
+
+  /**
+   * The extent at the previous 'moveend' event.
+   * @private
+   * @type {ol.Extent}
+   */
+  this.previousExtent_ = ol.extent.createEmpty();
+
+  /**
+   * @private
+   * @type {goog.events.Key}
+   */
+  this.viewPropertyListenerKey_ = null;
+
+  /**
+   * @private
+   * @type {Array.<goog.events.Key>}
+   */
+  this.layerGroupPropertyListenerKeys_ = null;
+
+  /**
+   * @private
+   * @type {Element}
+   */
+  this.viewport_ = document.createElement('DIV');
+  this.viewport_.className = 'ol-viewport';
+  this.viewport_.style.position = 'relative';
+  this.viewport_.style.overflow = 'hidden';
+  this.viewport_.style.width = '100%';
+  this.viewport_.style.height = '100%';
+  // prevent page zoom on IE >= 10 browsers
+  this.viewport_.style.msTouchAction = 'none';
+  this.viewport_.style.touchAction = 'none';
+  if (ol.has.TOUCH) {
+    goog.dom.classlist.add(this.viewport_, 'ol-touch');
+  }
+
+  /**
+   * @private
+   * @type {Element}
+   */
+  this.overlayContainer_ = document.createElement('DIV');
+  this.overlayContainer_.className = 'ol-overlaycontainer';
+  this.viewport_.appendChild(this.overlayContainer_);
+
+  /**
+   * @private
+   * @type {Element}
+   */
+  this.overlayContainerStopEvent_ = document.createElement('DIV');
+  this.overlayContainerStopEvent_.className = 'ol-overlaycontainer-stopevent';
+  goog.events.listen(this.overlayContainerStopEvent_, [
+    goog.events.EventType.CLICK,
+    goog.events.EventType.DBLCLICK,
+    goog.events.EventType.MOUSEDOWN,
+    goog.events.EventType.TOUCHSTART,
+    goog.events.EventType.MSPOINTERDOWN,
+    ol.MapBrowserEvent.EventType.POINTERDOWN,
+    goog.userAgent.GECKO ? 'DOMMouseScroll' : 'mousewheel'
+  ], goog.events.Event.stopPropagation);
+  this.viewport_.appendChild(this.overlayContainerStopEvent_);
+
+  var mapBrowserEventHandler = new ol.MapBrowserEventHandler(this);
+  goog.events.listen(mapBrowserEventHandler,
+      goog.object.getValues(ol.MapBrowserEvent.EventType),
+      this.handleMapBrowserEvent, false, this);
+  this.registerDisposable(mapBrowserEventHandler);
+
+  /**
+   * @private
+   * @type {Element|Document}
+   */
+  this.keyboardEventTarget_ = optionsInternal.keyboardEventTarget;
+
+  /**
+   * @private
+   * @type {goog.events.KeyHandler}
+   */
+  this.keyHandler_ = new goog.events.KeyHandler();
+  goog.events.listen(this.keyHandler_, goog.events.KeyHandler.EventType.KEY,
+      this.handleBrowserEvent, false, this);
+  this.registerDisposable(this.keyHandler_);
+
+  var mouseWheelHandler = new goog.events.MouseWheelHandler(this.viewport_);
+  goog.events.listen(mouseWheelHandler,
+      goog.events.MouseWheelHandler.EventType.MOUSEWHEEL,
+      this.handleBrowserEvent, false, this);
+  this.registerDisposable(mouseWheelHandler);
+
+  /**
+   * @type {ol.Collection.<ol.control.Control>}
+   * @private
+   */
+  this.controls_ = optionsInternal.controls;
+
+  /**
+   * @type {ol.Collection.<ol.interaction.Interaction>}
+   * @private
+   */
+  this.interactions_ = optionsInternal.interactions;
+
+  /**
+   * @type {ol.Collection.<ol.Overlay>}
+   * @private
+   */
+  this.overlays_ = optionsInternal.overlays;
+
+  /**
+   * A lookup of overlays by id.
+   * @private
+   * @type {Object.<string, ol.Overlay>}
+   */
+  this.overlayIdIndex_ = {};
+
+  /**
+   * @type {ol.renderer.Map}
+   * @private
+   */
+  this.renderer_ =
+      new optionsInternal.rendererConstructor(this.viewport_, this);
+  this.registerDisposable(this.renderer_);
+
+  /**
+   * @type {goog.dom.ViewportSizeMonitor}
+   * @private
+   */
+  this.viewportSizeMonitor_ = new goog.dom.ViewportSizeMonitor();
+  this.registerDisposable(this.viewportSizeMonitor_);
+
+  /**
+   * @type {goog.events.Key}
+   * @private
+   */
+  this.viewportResizeListenerKey_ = null;
+
+  /**
+   * @private
+   * @type {ol.Coordinate}
+   */
+  this.focus_ = null;
+
+  /**
+   * @private
+   * @type {Array.<ol.PreRenderFunction>}
+   */
+  this.preRenderFunctions_ = [];
+
+  /**
+   * @private
+   * @type {Array.<ol.PostRenderFunction>}
+   */
+  this.postRenderFunctions_ = [];
+
+  /**
+   * @private
+   * @type {ol.TileQueue}
+   */
+  this.tileQueue_ = new ol.TileQueue(
+      goog.bind(this.getTilePriority, this),
+      goog.bind(this.handleTileChange_, this));
+
+  /**
+   * Uids of features to skip at rendering time.
+   * @type {Object.<string, boolean>}
+   * @private
+   */
+  this.skippedFeatureUids_ = {};
+
+  goog.events.listen(
+      this, ol.Object.getChangeEventType(ol.MapProperty.LAYERGROUP),
+      this.handleLayerGroupChanged_, false, this);
+  goog.events.listen(this, ol.Object.getChangeEventType(ol.MapProperty.VIEW),
+      this.handleViewChanged_, false, this);
+  goog.events.listen(this, ol.Object.getChangeEventType(ol.MapProperty.SIZE),
+      this.handleSizeChanged_, false, this);
+  goog.events.listen(this, ol.Object.getChangeEventType(ol.MapProperty.TARGET),
+      this.handleTargetChanged_, false, this);
+
+  // setProperties will trigger the rendering of the map if the map
+  // is "defined" already.
+  this.setProperties(optionsInternal.values);
+
+  this.controls_.forEach(
+      /**
+       * @param {ol.control.Control} control Control.
+       * @this {ol.Map}
+       */
+      function(control) {
+        control.setMap(this);
+      }, this);
+
+  goog.events.listen(this.controls_, ol.CollectionEventType.ADD,
+      /**
+       * @param {ol.CollectionEvent} event Collection event.
+       */
+      function(event) {
+        event.element.setMap(this);
+      }, false, this);
+
+  goog.events.listen(this.controls_, ol.CollectionEventType.REMOVE,
+      /**
+       * @param {ol.CollectionEvent} event Collection event.
+       */
+      function(event) {
+        event.element.setMap(null);
+      }, false, this);
+
+  this.interactions_.forEach(
+      /**
+       * @param {ol.interaction.Interaction} interaction Interaction.
+       * @this {ol.Map}
+       */
+      function(interaction) {
+        interaction.setMap(this);
+      }, this);
+
+  goog.events.listen(this.interactions_, ol.CollectionEventType.ADD,
+      /**
+       * @param {ol.CollectionEvent} event Collection event.
+       */
+      function(event) {
+        event.element.setMap(this);
+      }, false, this);
+
+  goog.events.listen(this.interactions_, ol.CollectionEventType.REMOVE,
+      /**
+       * @param {ol.CollectionEvent} event Collection event.
+       */
+      function(event) {
+        event.element.setMap(null);
+      }, false, this);
+
+  this.overlays_.forEach(this.addOverlayInternal_, this);
+
+  goog.events.listen(this.overlays_, ol.CollectionEventType.ADD,
+      /**
+       * @param {ol.CollectionEvent} event Collection event.
+       */
+      function(event) {
+        this.addOverlayInternal_(/** @type {ol.Overlay} */ (event.element));
+      }, false, this);
+
+  goog.events.listen(this.overlays_, ol.CollectionEventType.REMOVE,
+      /**
+       * @param {ol.CollectionEvent} event Collection event.
+       */
+      function(event) {
+        var id = event.element.getId();
+        if (id !== undefined) {
+          delete this.overlayIdIndex_[id.toString()];
+        }
+        event.element.setMap(null);
+      }, false, this);
+
+};
+goog.inherits(ol.Map, ol.Object);
+
+
+/**
+ * Add the given control to the map.
+ * @param {ol.control.Control} control Control.
+ * @api stable
+ */
+ol.Map.prototype.addControl = function(control) {
+  var controls = this.getControls();
+  goog.asserts.assert(controls !== undefined, 'controls should be defined');
+  controls.push(control);
+};
+
+
+/**
+ * Add the given interaction to the map.
+ * @param {ol.interaction.Interaction} interaction Interaction to add.
+ * @api stable
+ */
+ol.Map.prototype.addInteraction = function(interaction) {
+  var interactions = this.getInteractions();
+  goog.asserts.assert(interactions !== undefined,
+      'interactions should be defined');
+  interactions.push(interaction);
+};
+
+
+/**
+ * Adds the given layer to the top of this map. If you want to add a layer
+ * elsewhere in the stack, use `getLayers()` and the methods available on
+ * {@link ol.Collection}.
+ * @param {ol.layer.Base} layer Layer.
+ * @api stable
+ */
+ol.Map.prototype.addLayer = function(layer) {
+  var layers = this.getLayerGroup().getLayers();
+  layers.push(layer);
+};
+
+
+/**
+ * Add the given overlay to the map.
+ * @param {ol.Overlay} overlay Overlay.
+ * @api stable
+ */
+ol.Map.prototype.addOverlay = function(overlay) {
+  var overlays = this.getOverlays();
+  goog.asserts.assert(overlays !== undefined, 'overlays should be defined');
+  overlays.push(overlay);
+};
+
+
+/**
+ * This deals with map's overlay collection changes.
+ * @param {ol.Overlay} overlay Overlay.
+ * @private
+ */
+ol.Map.prototype.addOverlayInternal_ = function(overlay) {
+  var id = overlay.getId();
+  if (id !== undefined) {
+    this.overlayIdIndex_[id.toString()] = overlay;
+  }
+  overlay.setMap(this);
+};
+
+
+/**
+ * Add functions to be called before rendering. This can be used for attaching
+ * animations before updating the map's view.  The {@link ol.animation}
+ * namespace provides several static methods for creating prerender functions.
+ * @param {...ol.PreRenderFunction} var_args Any number of pre-render functions.
+ * @api
+ */
+ol.Map.prototype.beforeRender = function(var_args) {
+  this.render();
+  Array.prototype.push.apply(this.preRenderFunctions_, arguments);
+};
+
+
+/**
+ * @param {ol.PreRenderFunction} preRenderFunction Pre-render function.
+ * @return {boolean} Whether the preRenderFunction has been found and removed.
+ */
+ol.Map.prototype.removePreRenderFunction = function(preRenderFunction) {
+  return goog.array.remove(this.preRenderFunctions_, preRenderFunction);
+};
+
+
+/**
+ *
+ * @inheritDoc
+ */
+ol.Map.prototype.disposeInternal = function() {
+  goog.dom.removeNode(this.viewport_);
+  goog.base(this, 'disposeInternal');
+};
+
+
+/**
+ * Detect features that intersect a pixel on the viewport, and execute a
+ * callback with each intersecting feature. Layers included in the detection can
+ * be configured through `opt_layerFilter`.
+ * @param {ol.Pixel} pixel Pixel.
+ * @param {function(this: S, (ol.Feature|ol.render.Feature),
+ *     ol.layer.Layer): T} callback Feature callback. The callback will be
+ *     called with two arguments. The first argument is one
+ *     {@link ol.Feature feature} or
+ *     {@link ol.render.Feature render feature} at the pixel, the second is
+ *     the {@link ol.layer.Layer layer} of the feature and will be null for
+ *     unmanaged layers. To stop detection, callback functions can return a
+ *     truthy value.
+ * @param {S=} opt_this Value to use as `this` when executing `callback`.
+ * @param {(function(this: U, ol.layer.Layer): boolean)=} opt_layerFilter Layer
+ *     filter function. The filter function will receive one argument, the
+ *     {@link ol.layer.Layer layer-candidate} and it should return a boolean
+ *     value. Only layers which are visible and for which this function returns
+ *     `true` will be tested for features. By default, all visible layers will
+ *     be tested.
+ * @param {U=} opt_this2 Value to use as `this` when executing `layerFilter`.
+ * @return {T|undefined} Callback result, i.e. the return value of last
+ * callback execution, or the first truthy callback return value.
+ * @template S,T,U
+ * @api stable
+ */
+ol.Map.prototype.forEachFeatureAtPixel =
+    function(pixel, callback, opt_this, opt_layerFilter, opt_this2) {
+  if (!this.frameState_) {
+    return;
+  }
+  var coordinate = this.getCoordinateFromPixel(pixel);
+  var thisArg = opt_this !== undefined ? opt_this : null;
+  var layerFilter = opt_layerFilter !== undefined ?
+      opt_layerFilter : goog.functions.TRUE;
+  var thisArg2 = opt_this2 !== undefined ? opt_this2 : null;
+  return this.renderer_.forEachFeatureAtCoordinate(
+      coordinate, this.frameState_, callback, thisArg,
+      layerFilter, thisArg2);
+};
+
+
+/**
+ * Detect layers that have a color value at a pixel on the viewport, and
+ * execute a callback with each matching layer. Layers included in the
+ * detection can be configured through `opt_layerFilter`.
+ * @param {ol.Pixel} pixel Pixel.
+ * @param {function(this: S, ol.layer.Layer): T} callback Layer
+ *     callback. Will receive one argument, the {@link ol.layer.Layer layer}
+ *     that contains the color pixel. To stop detection, callback functions can
+ *     return a truthy value.
+ * @param {S=} opt_this Value to use as `this` when executing `callback`.
+ * @param {(function(this: U, ol.layer.Layer): boolean)=} opt_layerFilter Layer
+ *     filter function. The filter function will receive one argument, the
+ *     {@link ol.layer.Layer layer-candidate} and it should return a boolean
+ *     value. Only layers which are visible and for which this function returns
+ *     `true` will be tested for features. By default, all visible layers will
+ *     be tested.
+ * @param {U=} opt_this2 Value to use as `this` when executing `layerFilter`.
+ * @return {T|undefined} Callback result, i.e. the return value of last
+ * callback execution, or the first truthy callback return value.
+ * @template S,T,U
+ * @api stable
+ */
+ol.Map.prototype.forEachLayerAtPixel =
+    function(pixel, callback, opt_this, opt_layerFilter, opt_this2) {
+  if (!this.frameState_) {
+    return;
+  }
+  var thisArg = opt_this !== undefined ? opt_this : null;
+  var layerFilter = opt_layerFilter !== undefined ?
+      opt_layerFilter : goog.functions.TRUE;
+  var thisArg2 = opt_this2 !== undefined ? opt_this2 : null;
+  return this.renderer_.forEachLayerAtPixel(
+      pixel, this.frameState_, callback, thisArg,
+      layerFilter, thisArg2);
+};
+
+
+/**
+ * Detect if features intersect a pixel on the viewport. Layers included in the
+ * detection can be configured through `opt_layerFilter`.
+ * @param {ol.Pixel} pixel Pixel.
+ * @param {(function(this: U, ol.layer.Layer): boolean)=} opt_layerFilter Layer
+ *     filter function. The filter function will receive one argument, the
+ *     {@link ol.layer.Layer layer-candidate} and it should return a boolean
+ *     value. Only layers which are visible and for which this function returns
+ *     `true` will be tested for features. By default, all visible layers will
+ *     be tested.
+ * @param {U=} opt_this Value to use as `this` when executing `layerFilter`.
+ * @return {boolean} Is there a feature at the given pixel?
+ * @template U
+ * @api
+ */
+ol.Map.prototype.hasFeatureAtPixel =
+    function(pixel, opt_layerFilter, opt_this) {
+  if (!this.frameState_) {
+    return false;
+  }
+  var coordinate = this.getCoordinateFromPixel(pixel);
+  var layerFilter = opt_layerFilter !== undefined ?
+      opt_layerFilter : goog.functions.TRUE;
+  var thisArg = opt_this !== undefined ? opt_this : null;
+  return this.renderer_.hasFeatureAtCoordinate(
+      coordinate, this.frameState_, layerFilter, thisArg);
+};
+
+
+/**
+ * Returns the geographical coordinate for a browser event.
+ * @param {Event} event Event.
+ * @return {ol.Coordinate} Coordinate.
+ * @api stable
+ */
+ol.Map.prototype.getEventCoordinate = function(event) {
+  return this.getCoordinateFromPixel(this.getEventPixel(event));
+};
+
+
+/**
+ * Returns the map pixel position for a browser event relative to the viewport.
+ * @param {Event} event Event.
+ * @return {ol.Pixel} Pixel.
+ * @api stable
+ */
+ol.Map.prototype.getEventPixel = function(event) {
+  var eventPosition = goog.style.getRelativePosition(event, this.viewport_);
+  return [eventPosition.x, eventPosition.y];
+};
+
+
+/**
+ * Get the target in which this map is rendered.
+ * Note that this returns what is entered as an option or in setTarget:
+ * if that was an element, it returns an element; if a string, it returns that.
+ * @return {Element|string|undefined} The Element or id of the Element that the
+ *     map is rendered in.
+ * @observable
+ * @api stable
+ */
+ol.Map.prototype.getTarget = function() {
+  return /** @type {Element|string|undefined} */ (
+      this.get(ol.MapProperty.TARGET));
+};
+
+
+/**
+ * Get the DOM element into which this map is rendered. In contrast to
+ * `getTarget` this method always return an `Element`, or `null` if the
+ * map has no target.
+ * @return {Element} The element that the map is rendered in.
+ * @api
+ */
+ol.Map.prototype.getTargetElement = function() {
+  var target = this.getTarget();
+  return target !== undefined ? goog.dom.getElement(target) : null;
+};
+
+
+/**
+ * Get the coordinate for a given pixel.  This returns a coordinate in the
+ * map view projection.
+ * @param {ol.Pixel} pixel Pixel position in the map viewport.
+ * @return {ol.Coordinate} The coordinate for the pixel position.
+ * @api stable
+ */
+ol.Map.prototype.getCoordinateFromPixel = function(pixel) {
+  var frameState = this.frameState_;
+  if (!frameState) {
+    return null;
+  } else {
+    var vec2 = pixel.slice();
+    return ol.vec.Mat4.multVec2(frameState.pixelToCoordinateMatrix, vec2, vec2);
+  }
+};
+
+
+/**
+ * Get the map controls. Modifying this collection changes the controls
+ * associated with the map.
+ * @return {ol.Collection.<ol.control.Control>} Controls.
+ * @api stable
+ */
+ol.Map.prototype.getControls = function() {
+  return this.controls_;
+};
+
+
+/**
+ * Get the map overlays. Modifying this collection changes the overlays
+ * associated with the map.
+ * @return {ol.Collection.<ol.Overlay>} Overlays.
+ * @api stable
+ */
+ol.Map.prototype.getOverlays = function() {
+  return this.overlays_;
+};
+
+
+/**
+ * Get an overlay by its identifier (the value returned by overlay.getId()).
+ * Note that the index treats string and numeric identifiers as the same. So
+ * `map.getOverlayById(2)` will return an overlay with id `'2'` or `2`.
+ * @param {string|number} id Overlay identifier.
+ * @return {ol.Overlay} Overlay.
+ * @api
+ */
+ol.Map.prototype.getOverlayById = function(id) {
+  var overlay = this.overlayIdIndex_[id.toString()];
+  return overlay !== undefined ? overlay : null;
+};
+
+
+/**
+ * Get the map interactions. Modifying this collection changes the interactions
+ * associated with the map.
+ *
+ * Interactions are used for e.g. pan, zoom and rotate.
+ * @return {ol.Collection.<ol.interaction.Interaction>} Interactions.
+ * @api stable
+ */
+ol.Map.prototype.getInteractions = function() {
+  return this.interactions_;
+};
+
+
+/**
+ * Get the layergroup associated with this map.
+ * @return {ol.layer.Group} A layer group containing the layers in this map.
+ * @observable
+ * @api stable
+ */
+ol.Map.prototype.getLayerGroup = function() {
+  return /** @type {ol.layer.Group} */ (this.get(ol.MapProperty.LAYERGROUP));
+};
+
+
+/**
+ * Get the collection of layers associated with this map.
+ * @return {!ol.Collection.<ol.layer.Base>} Layers.
+ * @api stable
+ */
+ol.Map.prototype.getLayers = function() {
+  var layers = this.getLayerGroup().getLayers();
+  return layers;
+};
+
+
+/**
+ * Get the pixel for a coordinate.  This takes a coordinate in the map view
+ * projection and returns the corresponding pixel.
+ * @param {ol.Coordinate} coordinate A map coordinate.
+ * @return {ol.Pixel} A pixel position in the map viewport.
+ * @api stable
+ */
+ol.Map.prototype.getPixelFromCoordinate = function(coordinate) {
+  var frameState = this.frameState_;
+  if (!frameState) {
+    return null;
+  } else {
+    var vec2 = coordinate.slice(0, 2);
+    return ol.vec.Mat4.multVec2(frameState.coordinateToPixelMatrix, vec2, vec2);
+  }
+};
+
+
+/**
+ * Get the map renderer.
+ * @return {ol.renderer.Map} Renderer
+ */
+ol.Map.prototype.getRenderer = function() {
+  return this.renderer_;
+};
+
+
+/**
+ * Get the size of this map.
+ * @return {ol.Size|undefined} The size in pixels of the map in the DOM.
+ * @observable
+ * @api stable
+ */
+ol.Map.prototype.getSize = function() {
+  return /** @type {ol.Size|undefined} */ (this.get(ol.MapProperty.SIZE));
+};
+
+
+/**
+ * Get the view associated with this map. A view manages properties such as
+ * center and resolution.
+ * @return {ol.View} The view that controls this map.
+ * @observable
+ * @api stable
+ */
+ol.Map.prototype.getView = function() {
+  return /** @type {ol.View} */ (this.get(ol.MapProperty.VIEW));
+};
+
+
+/**
+ * Get the element that serves as the map viewport.
+ * @return {Element} Viewport.
+ * @api stable
+ */
+ol.Map.prototype.getViewport = function() {
+  return this.viewport_;
+};
+
+
+/**
+ * Get the element that serves as the container for overlays.  Elements added to
+ * this container will let mousedown and touchstart events through to the map,
+ * so clicks and gestures on an overlay will trigger {@link ol.MapBrowserEvent}
+ * events.
+ * @return {Element} The map's overlay container.
+ */
+ol.Map.prototype.getOverlayContainer = function() {
+  return this.overlayContainer_;
+};
+
+
+/**
+ * Get the element that serves as a container for overlays that don't allow
+ * event propagation. Elements added to this container won't let mousedown and
+ * touchstart events through to the map, so clicks and gestures on an overlay
+ * don't trigger any {@link ol.MapBrowserEvent}.
+ * @return {Element} The map's overlay container that stops events.
+ */
+ol.Map.prototype.getOverlayContainerStopEvent = function() {
+  return this.overlayContainerStopEvent_;
+};
+
+
+/**
+ * @param {ol.Tile} tile Tile.
+ * @param {string} tileSourceKey Tile source key.
+ * @param {ol.Coordinate} tileCenter Tile center.
+ * @param {number} tileResolution Tile resolution.
+ * @return {number} Tile priority.
+ */
+ol.Map.prototype.getTilePriority =
+    function(tile, tileSourceKey, tileCenter, tileResolution) {
+  // Filter out tiles at higher zoom levels than the current zoom level, or that
+  // are outside the visible extent.
+  var frameState = this.frameState_;
+  if (!frameState || !(tileSourceKey in frameState.wantedTiles)) {
+    return ol.structs.PriorityQueue.DROP;
+  }
+  var coordKey = ol.tilecoord.toString(tile.tileCoord);
+  if (!frameState.wantedTiles[tileSourceKey][coordKey]) {
+    return ol.structs.PriorityQueue.DROP;
+  }
+  // Prioritize the highest zoom level tiles closest to the focus.
+  // Tiles at higher zoom levels are prioritized using Math.log(tileResolution).
+  // Within a zoom level, tiles are prioritized by the distance in pixels
+  // between the center of the tile and the focus.  The factor of 65536 means
+  // that the prioritization should behave as desired for tiles up to
+  // 65536 * Math.log(2) = 45426 pixels from the focus.
+  var deltaX = tileCenter[0] - frameState.focus[0];
+  var deltaY = tileCenter[1] - frameState.focus[1];
+  return 65536 * Math.log(tileResolution) +
+      Math.sqrt(deltaX * deltaX + deltaY * deltaY) / tileResolution;
+};
+
+
+/**
+ * @param {goog.events.BrowserEvent} browserEvent Browser event.
+ * @param {string=} opt_type Type.
+ */
+ol.Map.prototype.handleBrowserEvent = function(browserEvent, opt_type) {
+  var type = opt_type || browserEvent.type;
+  var mapBrowserEvent = new ol.MapBrowserEvent(type, this, browserEvent);
+  this.handleMapBrowserEvent(mapBrowserEvent);
+};
+
+
+/**
+ * @param {ol.MapBrowserEvent} mapBrowserEvent The event to handle.
+ */
+ol.Map.prototype.handleMapBrowserEvent = function(mapBrowserEvent) {
+  if (!this.frameState_) {
+    // With no view defined, we cannot translate pixels into geographical
+    // coordinates so interactions cannot be used.
+    return;
+  }
+  this.focus_ = mapBrowserEvent.coordinate;
+  mapBrowserEvent.frameState = this.frameState_;
+  var interactions = this.getInteractions();
+  goog.asserts.assert(interactions !== undefined,
+      'interactions should be defined');
+  var interactionsArray = interactions.getArray();
+  var i;
+  if (this.dispatchEvent(mapBrowserEvent) !== false) {
+    for (i = interactionsArray.length - 1; i >= 0; i--) {
+      var interaction = interactionsArray[i];
+      if (!interaction.getActive()) {
+        continue;
+      }
+      var cont = interaction.handleEvent(mapBrowserEvent);
+      if (!cont) {
+        break;
+      }
+    }
+  }
+};
+
+
+/**
+ * @protected
+ */
+ol.Map.prototype.handlePostRender = function() {
+
+  var frameState = this.frameState_;
+
+  // Manage the tile queue
+  // Image loads are expensive and a limited resource, so try to use them
+  // efficiently:
+  // * When the view is static we allow a large number of parallel tile loads
+  //   to complete the frame as quickly as possible.
+  // * When animating or interacting, image loads can cause janks, so we reduce
+  //   the maximum number of loads per frame and limit the number of parallel
+  //   tile loads to remain reactive to view changes and to reduce the chance of
+  //   loading tiles that will quickly disappear from view.
+  var tileQueue = this.tileQueue_;
+  if (!tileQueue.isEmpty()) {
+    var maxTotalLoading = 16;
+    var maxNewLoads = maxTotalLoading;
+    var tileSourceCount = 0;
+    if (frameState) {
+      var hints = frameState.viewHints;
+      if (hints[ol.ViewHint.ANIMATING]) {
+        maxTotalLoading = this.loadTilesWhileAnimating_ ? 8 : 0;
+        maxNewLoads = 2;
+      }
+      if (hints[ol.ViewHint.INTERACTING]) {
+        maxTotalLoading = this.loadTilesWhileInteracting_ ? 8 : 0;
+        maxNewLoads = 2;
+      }
+      tileSourceCount = goog.object.getCount(frameState.wantedTiles);
+    }
+    maxTotalLoading *= tileSourceCount;
+    maxNewLoads *= tileSourceCount;
+    if (tileQueue.getTilesLoading() < maxTotalLoading) {
+      tileQueue.reprioritize(); // FIXME only call if view has changed
+      tileQueue.loadMoreTiles(maxTotalLoading, maxNewLoads);
+    }
+  }
+
+  var postRenderFunctions = this.postRenderFunctions_;
+  var i, ii;
+  for (i = 0, ii = postRenderFunctions.length; i < ii; ++i) {
+    postRenderFunctions[i](this, frameState);
+  }
+  postRenderFunctions.length = 0;
+};
+
+
+/**
+ * @private
+ */
+ol.Map.prototype.handleSizeChanged_ = function() {
+  this.render();
+};
+
+
+/**
+ * @private
+ */
+ol.Map.prototype.handleTargetChanged_ = function() {
+  // target may be undefined, null, a string or an Element.
+  // If it's a string we convert it to an Element before proceeding.
+  // If it's not now an Element we remove the viewport from the DOM.
+  // If it's an Element we append the viewport element to it.
+
+  var targetElement = this.getTargetElement();
+
+  this.keyHandler_.detach();
+
+  if (!targetElement) {
+    goog.dom.removeNode(this.viewport_);
+    if (this.viewportResizeListenerKey_) {
+      goog.events.unlistenByKey(this.viewportResizeListenerKey_);
+      this.viewportResizeListenerKey_ = null;
+    }
+  } else {
+    targetElement.appendChild(this.viewport_);
+
+    var keyboardEventTarget = !this.keyboardEventTarget_ ?
+        targetElement : this.keyboardEventTarget_;
+    this.keyHandler_.attach(keyboardEventTarget);
+
+    if (!this.viewportResizeListenerKey_) {
+      this.viewportResizeListenerKey_ = goog.events.listen(
+          this.viewportSizeMonitor_, goog.events.EventType.RESIZE,
+          this.updateSize, false, this);
+    }
+  }
+
+  this.updateSize();
+  // updateSize calls setSize, so no need to call this.render
+  // ourselves here.
+};
+
+
+/**
+ * @private
+ */
+ol.Map.prototype.handleTileChange_ = function() {
+  this.render();
+};
+
+
+/**
+ * @private
+ */
+ol.Map.prototype.handleViewPropertyChanged_ = function() {
+  this.render();
+};
+
+
+/**
+ * @private
+ */
+ol.Map.prototype.handleViewChanged_ = function() {
+  if (this.viewPropertyListenerKey_) {
+    goog.events.unlistenByKey(this.viewPropertyListenerKey_);
+    this.viewPropertyListenerKey_ = null;
+  }
+  var view = this.getView();
+  if (view) {
+    this.viewPropertyListenerKey_ = goog.events.listen(
+        view, ol.ObjectEventType.PROPERTYCHANGE,
+        this.handleViewPropertyChanged_, false, this);
+  }
+  this.render();
+};
+
+
+/**
+ * @param {goog.events.Event} event Event.
+ * @private
+ */
+ol.Map.prototype.handleLayerGroupMemberChanged_ = function(event) {
+  goog.asserts.assertInstanceof(event, goog.events.Event,
+      'event should be an Event');
+  this.render();
+};
+
+
+/**
+ * @param {ol.ObjectEvent} event Event.
+ * @private
+ */
+ol.Map.prototype.handleLayerGroupPropertyChanged_ = function(event) {
+  goog.asserts.assertInstanceof(event, ol.ObjectEvent,
+      'event should be an ol.ObjectEvent');
+  this.render();
+};
+
+
+/**
+ * @private
+ */
+ol.Map.prototype.handleLayerGroupChanged_ = function() {
+  if (this.layerGroupPropertyListenerKeys_) {
+    this.layerGroupPropertyListenerKeys_.forEach(goog.events.unlistenByKey);
+    this.layerGroupPropertyListenerKeys_ = null;
+  }
+  var layerGroup = this.getLayerGroup();
+  if (layerGroup) {
+    this.layerGroupPropertyListenerKeys_ = [
+      goog.events.listen(
+          layerGroup, ol.ObjectEventType.PROPERTYCHANGE,
+          this.handleLayerGroupPropertyChanged_, false, this),
+      goog.events.listen(
+          layerGroup, goog.events.EventType.CHANGE,
+          this.handleLayerGroupMemberChanged_, false, this)
+    ];
+  }
+  this.render();
+};
+
+
+/**
+ * Returns `true` if the map is defined, `false` otherwise. The map is defined
+ * if it is contained in `document`, visible, has non-zero height and width, and
+ * has a defined view.
+ * @return {boolean} Is defined.
+ */
+ol.Map.prototype.isDef = function() {
+  if (!goog.dom.contains(document, this.viewport_)) {
+    return false;
+  }
+  if (!goog.style.isElementShown(this.viewport_)) {
+    return false;
+  }
+  var size = this.getSize();
+  if (!size || size[0] <= 0 || size[1] <= 0) {
+    return false;
+  }
+  var view = this.getView();
+  if (!view || !view.isDef()) {
+    return false;
+  }
+  return true;
+};
+
+
+/**
+ * @return {boolean} Is rendered.
+ */
+ol.Map.prototype.isRendered = function() {
+  return !!this.frameState_;
+};
+
+
+/**
+ * Requests an immediate render in a synchronous manner.
+ * @api stable
+ */
+ol.Map.prototype.renderSync = function() {
+  this.animationDelay_.fire();
+};
+
+
+/**
+ * Request a map rendering (at the next animation frame).
+ * @api stable
+ */
+ol.Map.prototype.render = function() {
+  if (!this.animationDelay_.isActive()) {
+    this.animationDelay_.start();
+  }
+};
+
+
+/**
+ * Remove the given control from the map.
+ * @param {ol.control.Control} control Control.
+ * @return {ol.control.Control|undefined} The removed control (or undefined
+ *     if the control was not found).
+ * @api stable
+ */
+ol.Map.prototype.removeControl = function(control) {
+  var controls = this.getControls();
+  goog.asserts.assert(controls !== undefined, 'controls should be defined');
+  return controls.remove(control);
+};
+
+
+/**
+ * Remove the given interaction from the map.
+ * @param {ol.interaction.Interaction} interaction Interaction to remove.
+ * @return {ol.interaction.Interaction|undefined} The removed interaction (or
+ *     undefined if the interaction was not found).
+ * @api stable
+ */
+ol.Map.prototype.removeInteraction = function(interaction) {
+  var interactions = this.getInteractions();
+  goog.asserts.assert(interactions !== undefined,
+      'interactions should be defined');
+  return interactions.remove(interaction);
+};
+
+
+/**
+ * Removes the given layer from the map.
+ * @param {ol.layer.Base} layer Layer.
+ * @return {ol.layer.Base|undefined} The removed layer (or undefined if the
+ *     layer was not found).
+ * @api stable
+ */
+ol.Map.prototype.removeLayer = function(layer) {
+  var layers = this.getLayerGroup().getLayers();
+  return layers.remove(layer);
+};
+
+
+/**
+ * Remove the given overlay from the map.
+ * @param {ol.Overlay} overlay Overlay.
+ * @return {ol.Overlay|undefined} The removed overlay (or undefined
+ *     if the overlay was not found).
+ * @api stable
+ */
+ol.Map.prototype.removeOverlay = function(overlay) {
+  var overlays = this.getOverlays();
+  goog.asserts.assert(overlays !== undefined, 'overlays should be defined');
+  return overlays.remove(overlay);
+};
+
+
+/**
+ * @param {number} time Time.
+ * @private
+ */
+ol.Map.prototype.renderFrame_ = function(time) {
+
+  var i, ii, viewState;
+
+  var size = this.getSize();
+  var view = this.getView();
+  /** @type {?olx.FrameState} */
+  var frameState = null;
+  if (size !== undefined && ol.size.hasArea(size) &&
+      view && view.isDef()) {
+    var viewHints = view.getHints();
+    var layerStatesArray = this.getLayerGroup().getLayerStatesArray();
+    var layerStates = {};
+    for (i = 0, ii = layerStatesArray.length; i < ii; ++i) {
+      layerStates[goog.getUid(layerStatesArray[i].layer)] = layerStatesArray[i];
+    }
+    viewState = view.getState();
+    frameState = /** @type {olx.FrameState} */ ({
+      animate: false,
+      attributions: {},
+      coordinateToPixelMatrix: this.coordinateToPixelMatrix_,
+      extent: null,
+      focus: !this.focus_ ? viewState.center : this.focus_,
+      index: this.frameIndex_++,
+      layerStates: layerStates,
+      layerStatesArray: layerStatesArray,
+      logos: goog.object.clone(this.logos_),
+      pixelRatio: this.pixelRatio_,
+      pixelToCoordinateMatrix: this.pixelToCoordinateMatrix_,
+      postRenderFunctions: [],
+      size: size,
+      skippedFeatureUids: this.skippedFeatureUids_,
+      tileQueue: this.tileQueue_,
+      time: time,
+      usedTiles: {},
+      viewState: viewState,
+      viewHints: viewHints,
+      wantedTiles: {}
+    });
+  }
+
+  if (frameState) {
+    var preRenderFunctions = this.preRenderFunctions_;
+    var n = 0, preRenderFunction;
+    for (i = 0, ii = preRenderFunctions.length; i < ii; ++i) {
+      preRenderFunction = preRenderFunctions[i];
+      if (preRenderFunction(this, frameState)) {
+        preRenderFunctions[n++] = preRenderFunction;
+      }
+    }
+    preRenderFunctions.length = n;
+
+    frameState.extent = ol.extent.getForViewAndSize(viewState.center,
+        viewState.resolution, viewState.rotation, frameState.size);
+  }
+
+  this.frameState_ = frameState;
+  this.renderer_.renderFrame(frameState);
+
+  if (frameState) {
+    if (frameState.animate) {
+      this.render();
+    }
+    Array.prototype.push.apply(
+        this.postRenderFunctions_, frameState.postRenderFunctions);
+
+    var idle = this.preRenderFunctions_.length === 0 &&
+        !frameState.viewHints[ol.ViewHint.ANIMATING] &&
+        !frameState.viewHints[ol.ViewHint.INTERACTING] &&
+        !ol.extent.equals(frameState.extent, this.previousExtent_);
+
+    if (idle) {
+      this.dispatchEvent(
+          new ol.MapEvent(ol.MapEventType.MOVEEND, this, frameState));
+      ol.extent.clone(frameState.extent, this.previousExtent_);
+    }
+  }
+
+  this.dispatchEvent(
+      new ol.MapEvent(ol.MapEventType.POSTRENDER, this, frameState));
+
+  goog.async.nextTick(this.handlePostRender, this);
+
+};
+
+
+/**
+ * Sets the layergroup of this map.
+ * @param {ol.layer.Group} layerGroup A layer group containing the layers in
+ *     this map.
+ * @observable
+ * @api stable
+ */
+ol.Map.prototype.setLayerGroup = function(layerGroup) {
+  this.set(ol.MapProperty.LAYERGROUP, layerGroup);
+};
+
+
+/**
+ * Set the size of this map.
+ * @param {ol.Size|undefined} size The size in pixels of the map in the DOM.
+ * @observable
+ * @api
+ */
+ol.Map.prototype.setSize = function(size) {
+  this.set(ol.MapProperty.SIZE, size);
+};
+
+
+/**
+ * Set the target element to render this map into.
+ * @param {Element|string|undefined} target The Element or id of the Element
+ *     that the map is rendered in.
+ * @observable
+ * @api stable
+ */
+ol.Map.prototype.setTarget = function(target) {
+  this.set(ol.MapProperty.TARGET, target);
+};
+
+
+/**
+ * Set the view for this map.
+ * @param {ol.View} view The view that controls this map.
+ * @observable
+ * @api stable
+ */
+ol.Map.prototype.setView = function(view) {
+  this.set(ol.MapProperty.VIEW, view);
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature.
+ */
+ol.Map.prototype.skipFeature = function(feature) {
+  var featureUid = goog.getUid(feature).toString();
+  this.skippedFeatureUids_[featureUid] = true;
+  this.render();
+};
+
+
+/**
+ * Force a recalculation of the map viewport size.  This should be called when
+ * third-party code changes the size of the map viewport.
+ * @api stable
+ */
+ol.Map.prototype.updateSize = function() {
+  var targetElement = this.getTargetElement();
+
+  if (!targetElement) {
+    this.setSize(undefined);
+  } else {
+    var size = goog.style.getContentBoxSize(targetElement);
+    this.setSize([size.width, size.height]);
+  }
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature.
+ */
+ol.Map.prototype.unskipFeature = function(feature) {
+  var featureUid = goog.getUid(feature).toString();
+  delete this.skippedFeatureUids_[featureUid];
+  this.render();
+};
+
+
+/**
+ * @typedef {{controls: ol.Collection.<ol.control.Control>,
+ *            interactions: ol.Collection.<ol.interaction.Interaction>,
+ *            keyboardEventTarget: (Element|Document),
+ *            logos: Object.<string, string>,
+ *            overlays: ol.Collection.<ol.Overlay>,
+ *            rendererConstructor:
+ *                function(new: ol.renderer.Map, Element, ol.Map),
+ *            values: Object.<string, *>}}
+ */
+ol.MapOptionsInternal;
+
+
+/**
+ * @param {olx.MapOptions} options Map options.
+ * @return {ol.MapOptionsInternal} Internal map options.
+ */
+ol.Map.createOptionsInternal = function(options) {
+
+  /**
+   * @type {Element|Document}
+   */
+  var keyboardEventTarget = null;
+  if (options.keyboardEventTarget !== undefined) {
+    // cannot use goog.dom.getElement because its argument cannot be
+    // of type Document
+    keyboardEventTarget = goog.isString(options.keyboardEventTarget) ?
+        document.getElementById(options.keyboardEventTarget) :
+        options.keyboardEventTarget;
+  }
+
+  /**
+   * @type {Object.<string, *>}
+   */
+  var values = {};
+
+  var logos = {};
+  if (options.logo === undefined ||
+      (goog.isBoolean(options.logo) && options.logo)) {
+    logos[ol.OL3_LOGO_URL] = ol.OL3_URL;
+  } else {
+    var logo = options.logo;
+    if (goog.isString(logo)) {
+      logos[logo] = '';
+    } else if (goog.isObject(logo)) {
+      goog.asserts.assertString(logo.href, 'logo.href should be a string');
+      goog.asserts.assertString(logo.src, 'logo.src should be a string');
+      logos[logo.src] = logo.href;
+    }
+  }
+
+  var layerGroup = (options.layers instanceof ol.layer.Group) ?
+      options.layers : new ol.layer.Group({layers: options.layers});
+  values[ol.MapProperty.LAYERGROUP] = layerGroup;
+
+  values[ol.MapProperty.TARGET] = options.target;
+
+  values[ol.MapProperty.VIEW] = options.view !== undefined ?
+      options.view : new ol.View();
+
+  /**
+   * @type {function(new: ol.renderer.Map, Element, ol.Map)}
+   */
+  var rendererConstructor = ol.renderer.Map;
+
+  /**
+   * @type {Array.<ol.RendererType>}
+   */
+  var rendererTypes;
+  if (options.renderer !== undefined) {
+    if (goog.isArray(options.renderer)) {
+      rendererTypes = options.renderer;
+    } else if (goog.isString(options.renderer)) {
+      rendererTypes = [options.renderer];
+    } else {
+      goog.asserts.fail('Incorrect format for renderer option');
+    }
+  } else {
+    rendererTypes = ol.DEFAULT_RENDERER_TYPES;
+  }
+
+  var i, ii;
+  for (i = 0, ii = rendererTypes.length; i < ii; ++i) {
+    /** @type {ol.RendererType} */
+    var rendererType = rendererTypes[i];
+    if (ol.ENABLE_CANVAS && rendererType == ol.RendererType.CANVAS) {
+      if (ol.has.CANVAS) {
+        rendererConstructor = ol.renderer.canvas.Map;
+        break;
+      }
+    } else if (ol.ENABLE_DOM && rendererType == ol.RendererType.DOM) {
+      if (ol.has.DOM) {
+        rendererConstructor = ol.renderer.dom.Map;
+        break;
+      }
+    } else if (ol.ENABLE_WEBGL && rendererType == ol.RendererType.WEBGL) {
+      if (ol.has.WEBGL) {
+        rendererConstructor = ol.renderer.webgl.Map;
+        break;
+      }
+    }
+  }
+
+  var controls;
+  if (options.controls !== undefined) {
+    if (goog.isArray(options.controls)) {
+      controls = new ol.Collection(options.controls.slice());
+    } else {
+      goog.asserts.assertInstanceof(options.controls, ol.Collection,
+          'options.controls should be an ol.Collection');
+      controls = options.controls;
+    }
+  } else {
+    controls = ol.control.defaults();
+  }
+
+  var interactions;
+  if (options.interactions !== undefined) {
+    if (goog.isArray(options.interactions)) {
+      interactions = new ol.Collection(options.interactions.slice());
+    } else {
+      goog.asserts.assertInstanceof(options.interactions, ol.Collection,
+          'options.interactions should be an ol.Collection');
+      interactions = options.interactions;
+    }
+  } else {
+    interactions = ol.interaction.defaults();
+  }
+
+  var overlays;
+  if (options.overlays !== undefined) {
+    if (goog.isArray(options.overlays)) {
+      overlays = new ol.Collection(options.overlays.slice());
+    } else {
+      goog.asserts.assertInstanceof(options.overlays, ol.Collection,
+          'options.overlays should be an ol.Collection');
+      overlays = options.overlays;
+    }
+  } else {
+    overlays = new ol.Collection();
+  }
+
+  return {
+    controls: controls,
+    interactions: interactions,
+    keyboardEventTarget: keyboardEventTarget,
+    logos: logos,
+    overlays: overlays,
+    rendererConstructor: rendererConstructor,
+    values: values
+  };
+
+};
+
+
+ol.proj.common.add();
+
+
+if (goog.DEBUG) {
+  (function() {
+    goog.debug.Console.autoInstall();
+    var logger = goog.log.getLogger('ol');
+    logger.setLevel(goog.log.Level.FINEST);
+  })();
+}
+
+goog.provide('ol.Overlay');
+goog.provide('ol.OverlayPositioning');
+goog.provide('ol.OverlayProperty');
+
+goog.require('goog.asserts');
+goog.require('goog.dom');
+goog.require('goog.events');
+goog.require('goog.style');
+goog.require('ol.Coordinate');
+goog.require('ol.Map');
+goog.require('ol.MapEventType');
+goog.require('ol.Object');
+goog.require('ol.animation');
+goog.require('ol.dom');
+goog.require('ol.extent');
+
+
+/**
+ * @enum {string}
+ */
+ol.OverlayProperty = {
+  ELEMENT: 'element',
+  MAP: 'map',
+  OFFSET: 'offset',
+  POSITION: 'position',
+  POSITIONING: 'positioning'
+};
+
+
+/**
+ * Overlay position: `'bottom-left'`, `'bottom-center'`,  `'bottom-right'`,
+ * `'center-left'`, `'center-center'`, `'center-right'`, `'top-left'`,
+ * `'top-center'`, `'top-right'`
+ * @enum {string}
+ * @api stable
+ */
+ol.OverlayPositioning = {
+  BOTTOM_LEFT: 'bottom-left',
+  BOTTOM_CENTER: 'bottom-center',
+  BOTTOM_RIGHT: 'bottom-right',
+  CENTER_LEFT: 'center-left',
+  CENTER_CENTER: 'center-center',
+  CENTER_RIGHT: 'center-right',
+  TOP_LEFT: 'top-left',
+  TOP_CENTER: 'top-center',
+  TOP_RIGHT: 'top-right'
+};
+
+
+
+/**
+ * @classdesc
+ * An element to be displayed over the map and attached to a single map
+ * location.  Like {@link ol.control.Control}, Overlays are visible widgets.
+ * Unlike Controls, they are not in a fixed position on the screen, but are tied
+ * to a geographical coordinate, so panning the map will move an Overlay but not
+ * a Control.
+ *
+ * Example:
+ *
+ *     var popup = new ol.Overlay({
+ *       element: document.getElementById('popup')
+ *     });
+ *     popup.setPosition(coordinate);
+ *     map.addOverlay(popup);
+ *
+ * @constructor
+ * @extends {ol.Object}
+ * @param {olx.OverlayOptions} options Overlay options.
+ * @api stable
+ */
+ol.Overlay = function(options) {
+
+  goog.base(this);
+
+  /**
+   * @private
+   * @type {number|string|undefined}
+   */
+  this.id_ = options.id;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.insertFirst_ = options.insertFirst !== undefined ?
+      options.insertFirst : true;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.stopEvent_ = options.stopEvent !== undefined ? options.stopEvent : true;
+
+  /**
+   * @private
+   * @type {Element}
+   */
+  this.element_ = document.createElement('DIV');
+  this.element_.className = 'ol-overlay-container';
+  this.element_.style.position = 'absolute';
+
+  /**
+   * @protected
+   * @type {boolean}
+   */
+  this.autoPan = options.autoPan !== undefined ? options.autoPan : false;
+
+  /**
+   * @private
+   * @type {olx.animation.PanOptions}
+   */
+  this.autoPanAnimation_ = options.autoPanAnimation !== undefined ?
+      options.autoPanAnimation : /** @type {olx.animation.PanOptions} */ ({});
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.autoPanMargin_ = options.autoPanMargin !== undefined ?
+      options.autoPanMargin : 20;
+
+  /**
+   * @private
+   * @type {{bottom_: string,
+   *         left_: string,
+   *         right_: string,
+   *         top_: string,
+   *         visible: boolean}}
+   */
+  this.rendered_ = {
+    bottom_: '',
+    left_: '',
+    right_: '',
+    top_: '',
+    visible: true
+  };
+
+  /**
+   * @private
+   * @type {goog.events.Key}
+   */
+  this.mapPostrenderListenerKey_ = null;
+
+  goog.events.listen(
+      this, ol.Object.getChangeEventType(ol.OverlayProperty.ELEMENT),
+      this.handleElementChanged, false, this);
+
+  goog.events.listen(
+      this, ol.Object.getChangeEventType(ol.OverlayProperty.MAP),
+      this.handleMapChanged, false, this);
+
+  goog.events.listen(
+      this, ol.Object.getChangeEventType(ol.OverlayProperty.OFFSET),
+      this.handleOffsetChanged, false, this);
+
+  goog.events.listen(
+      this, ol.Object.getChangeEventType(ol.OverlayProperty.POSITION),
+      this.handlePositionChanged, false, this);
+
+  goog.events.listen(
+      this, ol.Object.getChangeEventType(ol.OverlayProperty.POSITIONING),
+      this.handlePositioningChanged, false, this);
+
+  if (options.element !== undefined) {
+    this.setElement(options.element);
+  }
+
+  this.setOffset(options.offset !== undefined ? options.offset : [0, 0]);
+
+  this.setPositioning(options.positioning !== undefined ?
+      /** @type {ol.OverlayPositioning} */ (options.positioning) :
+      ol.OverlayPositioning.TOP_LEFT);
+
+  if (options.position !== undefined) {
+    this.setPosition(options.position);
+  }
+
+};
+goog.inherits(ol.Overlay, ol.Object);
+
+
+/**
+ * Get the DOM element of this overlay.
+ * @return {Element|undefined} The Element containing the overlay.
+ * @observable
+ * @api stable
+ */
+ol.Overlay.prototype.getElement = function() {
+  return /** @type {Element|undefined} */ (
+      this.get(ol.OverlayProperty.ELEMENT));
+};
+
+
+/**
+ * Get the overlay identifier which is set on constructor.
+ * @return {number|string|undefined} Id.
+ * @api
+ */
+ol.Overlay.prototype.getId = function() {
+  return this.id_;
+};
+
+
+/**
+ * Get the map associated with this overlay.
+ * @return {ol.Map|undefined} The map that the overlay is part of.
+ * @observable
+ * @api stable
+ */
+ol.Overlay.prototype.getMap = function() {
+  return /** @type {ol.Map|undefined} */ (
+      this.get(ol.OverlayProperty.MAP));
+};
+
+
+/**
+ * Get the offset of this overlay.
+ * @return {Array.<number>} The offset.
+ * @observable
+ * @api stable
+ */
+ol.Overlay.prototype.getOffset = function() {
+  return /** @type {Array.<number>} */ (
+      this.get(ol.OverlayProperty.OFFSET));
+};
+
+
+/**
+ * Get the current position of this overlay.
+ * @return {ol.Coordinate|undefined} The spatial point that the overlay is
+ *     anchored at.
+ * @observable
+ * @api stable
+ */
+ol.Overlay.prototype.getPosition = function() {
+  return /** @type {ol.Coordinate|undefined} */ (
+      this.get(ol.OverlayProperty.POSITION));
+};
+
+
+/**
+ * Get the current positioning of this overlay.
+ * @return {ol.OverlayPositioning} How the overlay is positioned
+ *     relative to its point on the map.
+ * @observable
+ * @api stable
+ */
+ol.Overlay.prototype.getPositioning = function() {
+  return /** @type {ol.OverlayPositioning} */ (
+      this.get(ol.OverlayProperty.POSITIONING));
+};
+
+
+/**
+ * @protected
+ */
+ol.Overlay.prototype.handleElementChanged = function() {
+  goog.dom.removeChildren(this.element_);
+  var element = this.getElement();
+  if (element) {
+    this.element_.appendChild(element);
+  }
+};
+
+
+/**
+ * @protected
+ */
+ol.Overlay.prototype.handleMapChanged = function() {
+  if (this.mapPostrenderListenerKey_) {
+    goog.dom.removeNode(this.element_);
+    goog.events.unlistenByKey(this.mapPostrenderListenerKey_);
+    this.mapPostrenderListenerKey_ = null;
+  }
+  var map = this.getMap();
+  if (map) {
+    this.mapPostrenderListenerKey_ = goog.events.listen(map,
+        ol.MapEventType.POSTRENDER, this.render, false, this);
+    this.updatePixelPosition();
+    var container = this.stopEvent_ ?
+        map.getOverlayContainerStopEvent() : map.getOverlayContainer();
+    if (this.insertFirst_) {
+      goog.dom.insertChildAt(/** @type {!Element} */ (
+          container), this.element_, 0);
+    } else {
+      container.appendChild(this.element_);
+    }
+  }
+};
+
+
+/**
+ * @protected
+ */
+ol.Overlay.prototype.render = function() {
+  this.updatePixelPosition();
+};
+
+
+/**
+ * @protected
+ */
+ol.Overlay.prototype.handleOffsetChanged = function() {
+  this.updatePixelPosition();
+};
+
+
+/**
+ * @protected
+ */
+ol.Overlay.prototype.handlePositionChanged = function() {
+  this.updatePixelPosition();
+  if (this.get(ol.OverlayProperty.POSITION) !== undefined && this.autoPan) {
+    this.panIntoView_();
+  }
+};
+
+
+/**
+ * @protected
+ */
+ol.Overlay.prototype.handlePositioningChanged = function() {
+  this.updatePixelPosition();
+};
+
+
+/**
+ * Set the DOM element to be associated with this overlay.
+ * @param {Element|undefined} element The Element containing the overlay.
+ * @observable
+ * @api stable
+ */
+ol.Overlay.prototype.setElement = function(element) {
+  this.set(ol.OverlayProperty.ELEMENT, element);
+};
+
+
+/**
+ * Set the map to be associated with this overlay.
+ * @param {ol.Map|undefined} map The map that the overlay is part of.
+ * @observable
+ * @api stable
+ */
+ol.Overlay.prototype.setMap = function(map) {
+  this.set(ol.OverlayProperty.MAP, map);
+};
+
+
+/**
+ * Set the offset for this overlay.
+ * @param {Array.<number>} offset Offset.
+ * @observable
+ * @api stable
+ */
+ol.Overlay.prototype.setOffset = function(offset) {
+  this.set(ol.OverlayProperty.OFFSET, offset);
+};
+
+
+/**
+ * Set the position for this overlay. If the position is `undefined` the
+ * overlay is hidden.
+ * @param {ol.Coordinate|undefined} position The spatial point that the overlay
+ *     is anchored at.
+ * @observable
+ * @api stable
+ */
+ol.Overlay.prototype.setPosition = function(position) {
+  this.set(ol.OverlayProperty.POSITION, position);
+};
+
+
+/**
+ * Pan the map so that the overlay is entirely visible in the current viewport
+ * (if necessary).
+ * @private
+ */
+ol.Overlay.prototype.panIntoView_ = function() {
+  goog.asserts.assert(this.autoPan, 'this.autoPan should be true');
+  var map = this.getMap();
+
+  if (map === undefined || !map.getTargetElement()) {
+    return;
+  }
+
+  var mapRect = this.getRect_(map.getTargetElement(), map.getSize());
+  var element = this.getElement();
+  goog.asserts.assert(element, 'element should be defined');
+  var overlayRect = this.getRect_(element,
+      [ol.dom.outerWidth(element), ol.dom.outerHeight(element)]);
+
+  var margin = this.autoPanMargin_;
+  if (!ol.extent.containsExtent(mapRect, overlayRect)) {
+    // the overlay is not completely inside the viewport, so pan the map
+    var offsetLeft = overlayRect[0] - mapRect[0];
+    var offsetRight = mapRect[2] - overlayRect[2];
+    var offsetTop = overlayRect[1] - mapRect[1];
+    var offsetBottom = mapRect[3] - overlayRect[3];
+
+    var delta = [0, 0];
+    if (offsetLeft < 0) {
+      // move map to the left
+      delta[0] = offsetLeft - margin;
+    } else if (offsetRight < 0) {
+      // move map to the right
+      delta[0] = Math.abs(offsetRight) + margin;
+    }
+    if (offsetTop < 0) {
+      // move map up
+      delta[1] = offsetTop - margin;
+    } else if (offsetBottom < 0) {
+      // move map down
+      delta[1] = Math.abs(offsetBottom) + margin;
+    }
+
+    if (delta[0] !== 0 || delta[1] !== 0) {
+      var center = map.getView().getCenter();
+      goog.asserts.assert(center !== undefined, 'center should be defined');
+      var centerPx = map.getPixelFromCoordinate(center);
+      var newCenterPx = [
+        centerPx[0] + delta[0],
+        centerPx[1] + delta[1]
+      ];
+
+      if (this.autoPanAnimation_) {
+        this.autoPanAnimation_.source = center;
+        map.beforeRender(ol.animation.pan(this.autoPanAnimation_));
+      }
+      map.getView().setCenter(map.getCoordinateFromPixel(newCenterPx));
+    }
+  }
+};
+
+
+/**
+ * Get the extent of an element relative to the document
+ * @param {Element|undefined} element The element.
+ * @param {ol.Size|undefined} size The size of the element.
+ * @return {ol.Extent}
+ * @private
+ */
+ol.Overlay.prototype.getRect_ = function(element, size) {
+  goog.asserts.assert(element, 'element should be defined');
+  goog.asserts.assert(size !== undefined, 'size should be defined');
+
+  var offset = goog.style.getPageOffset(element);
+  return [
+    offset.x,
+    offset.y,
+    offset.x + size[0],
+    offset.y + size[1]
+  ];
+};
+
+
+/**
+ * Set the positioning for this overlay.
+ * @param {ol.OverlayPositioning} positioning how the overlay is
+ *     positioned relative to its point on the map.
+ * @observable
+ * @api stable
+ */
+ol.Overlay.prototype.setPositioning = function(positioning) {
+  this.set(ol.OverlayProperty.POSITIONING, positioning);
+};
+
+
+/**
+ * Modify the visibility of the element.
+ * @param {boolean} visible
+ * @protected
+ */
+ol.Overlay.prototype.setVisible = function(visible) {
+  if (this.rendered_.visible !== visible) {
+    goog.style.setElementShown(this.element_, visible);
+    this.rendered_.visible = visible;
+  }
+};
+
+
+/**
+ * Update pixel position.
+ * @protected
+ */
+ol.Overlay.prototype.updatePixelPosition = function() {
+  var map = this.getMap();
+  var position = this.getPosition();
+  if (map === undefined || !map.isRendered() || position === undefined) {
+    this.setVisible(false);
+    return;
+  }
+
+  var pixel = map.getPixelFromCoordinate(position);
+  var mapSize = map.getSize();
+  this.updateRenderedPosition(pixel, mapSize);
+};
+
+
+/**
+ * @param {ol.Pixel} pixel
+ * @param {ol.Size|undefined} mapSize
+ * @protected
+ */
+ol.Overlay.prototype.updateRenderedPosition = function(pixel, mapSize) {
+  goog.asserts.assert(pixel, 'pixel should not be null');
+  goog.asserts.assert(mapSize !== undefined, 'mapSize should be defined');
+  var style = this.element_.style;
+  var offset = this.getOffset();
+  goog.asserts.assert(goog.isArray(offset), 'offset should be an array');
+
+  var positioning = this.getPositioning();
+  goog.asserts.assert(positioning !== undefined,
+      'positioning should be defined');
+
+  var offsetX = offset[0];
+  var offsetY = offset[1];
+  if (positioning == ol.OverlayPositioning.BOTTOM_RIGHT ||
+      positioning == ol.OverlayPositioning.CENTER_RIGHT ||
+      positioning == ol.OverlayPositioning.TOP_RIGHT) {
+    if (this.rendered_.left_ !== '') {
+      this.rendered_.left_ = style.left = '';
+    }
+    var right = Math.round(mapSize[0] - pixel[0] - offsetX) + 'px';
+    if (this.rendered_.right_ != right) {
+      this.rendered_.right_ = style.right = right;
+    }
+  } else {
+    if (this.rendered_.right_ !== '') {
+      this.rendered_.right_ = style.right = '';
+    }
+    if (positioning == ol.OverlayPositioning.BOTTOM_CENTER ||
+        positioning == ol.OverlayPositioning.CENTER_CENTER ||
+        positioning == ol.OverlayPositioning.TOP_CENTER) {
+      offsetX -= goog.style.getSize(this.element_).width / 2;
+    }
+    var left = Math.round(pixel[0] + offsetX) + 'px';
+    if (this.rendered_.left_ != left) {
+      this.rendered_.left_ = style.left = left;
+    }
+  }
+  if (positioning == ol.OverlayPositioning.BOTTOM_LEFT ||
+      positioning == ol.OverlayPositioning.BOTTOM_CENTER ||
+      positioning == ol.OverlayPositioning.BOTTOM_RIGHT) {
+    if (this.rendered_.top_ !== '') {
+      this.rendered_.top_ = style.top = '';
+    }
+    var bottom = Math.round(mapSize[1] - pixel[1] - offsetY) + 'px';
+    if (this.rendered_.bottom_ != bottom) {
+      this.rendered_.bottom_ = style.bottom = bottom;
+    }
+  } else {
+    if (this.rendered_.bottom_ !== '') {
+      this.rendered_.bottom_ = style.bottom = '';
+    }
+    if (positioning == ol.OverlayPositioning.CENTER_LEFT ||
+        positioning == ol.OverlayPositioning.CENTER_CENTER ||
+        positioning == ol.OverlayPositioning.CENTER_RIGHT) {
+      offsetY -= goog.style.getSize(this.element_).height / 2;
+    }
+    var top = Math.round(pixel[1] + offsetY) + 'px';
+    if (this.rendered_.top_ != top) {
+      this.rendered_.top_ = style.top = top;
+    }
+  }
+
+  this.setVisible(true);
+};
+
+goog.provide('ol.control.OverviewMap');
+
+goog.require('goog.asserts');
+goog.require('goog.dom');
+goog.require('goog.dom.classlist');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('goog.math.Size');
+goog.require('goog.style');
+goog.require('ol');
+goog.require('ol.Collection');
+goog.require('ol.Map');
+goog.require('ol.MapEventType');
+goog.require('ol.Object');
+goog.require('ol.ObjectEventType');
+goog.require('ol.Overlay');
+goog.require('ol.OverlayPositioning');
+goog.require('ol.View');
+goog.require('ol.ViewProperty');
+goog.require('ol.control.Control');
+goog.require('ol.coordinate');
+goog.require('ol.css');
+goog.require('ol.extent');
+
+
+
+/**
+ * Create a new control with a map acting as an overview map for an other
+ * defined map.
+ * @constructor
+ * @extends {ol.control.Control}
+ * @param {olx.control.OverviewMapOptions=} opt_options OverviewMap options.
+ * @api
+ */
+ol.control.OverviewMap = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  /**
+   * @type {boolean}
+   * @private
+   */
+  this.collapsed_ = options.collapsed !== undefined ? options.collapsed : true;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.collapsible_ = options.collapsible !== undefined ?
+      options.collapsible : true;
+
+  if (!this.collapsible_) {
+    this.collapsed_ = false;
+  }
+
+  var className = options.className ? options.className : 'ol-overviewmap';
+
+  var tipLabel = options.tipLabel ? options.tipLabel : 'Overview map';
+
+  var collapseLabel = options.collapseLabel ? options.collapseLabel : '\u00AB';
+
+  /**
+   * @private
+   * @type {Node}
+   */
+  this.collapseLabel_ = goog.isString(collapseLabel) ?
+      goog.dom.createDom('SPAN', {}, collapseLabel) :
+      collapseLabel;
+
+  var label = options.label ? options.label : '\u00BB';
+
+  /**
+   * @private
+   * @type {Node}
+   */
+  this.label_ = goog.isString(label) ?
+      goog.dom.createDom('SPAN', {}, label) :
+      label;
+
+  var activeLabel = (this.collapsible_ && !this.collapsed_) ?
+      this.collapseLabel_ : this.label_;
+  var button = goog.dom.createDom('BUTTON', {
+    'type': 'button',
+    'title': tipLabel
+  }, activeLabel);
+
+  goog.events.listen(button, goog.events.EventType.CLICK,
+      this.handleClick_, false, this);
+
+  var ovmapDiv = goog.dom.createDom('DIV', 'ol-overviewmap-map');
+
+  /**
+   * @type {ol.Map}
+   * @private
+   */
+  this.ovmap_ = new ol.Map({
+    controls: new ol.Collection(),
+    interactions: new ol.Collection(),
+    target: ovmapDiv,
+    view: options.view
+  });
+  var ovmap = this.ovmap_;
+
+  if (options.layers) {
+    options.layers.forEach(
+        /**
+       * @param {ol.layer.Layer} layer Layer.
+       */
+        function(layer) {
+          ovmap.addLayer(layer);
+        }, this);
+  }
+
+  var box = goog.dom.createDom('DIV', 'ol-overviewmap-box');
+
+  /**
+   * @type {ol.Overlay}
+   * @private
+   */
+  this.boxOverlay_ = new ol.Overlay({
+    position: [0, 0],
+    positioning: ol.OverlayPositioning.BOTTOM_LEFT,
+    element: box
+  });
+  this.ovmap_.addOverlay(this.boxOverlay_);
+
+  var cssClasses = className + ' ' + ol.css.CLASS_UNSELECTABLE + ' ' +
+      ol.css.CLASS_CONTROL +
+      (this.collapsed_ && this.collapsible_ ? ' ol-collapsed' : '') +
+      (this.collapsible_ ? '' : ' ol-uncollapsible');
+  var element = goog.dom.createDom('DIV',
+      cssClasses, ovmapDiv, button);
+
+  var render = options.render ? options.render : ol.control.OverviewMap.render;
+
+  goog.base(this, {
+    element: element,
+    render: render,
+    target: options.target
+  });
+};
+goog.inherits(ol.control.OverviewMap, ol.control.Control);
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.control.OverviewMap.prototype.setMap = function(map) {
+  var oldMap = this.getMap();
+  if (map === oldMap) {
+    return;
+  }
+  if (oldMap) {
+    var oldView = oldMap.getView();
+    if (oldView) {
+      this.unbindView_(oldView);
+    }
+  }
+  goog.base(this, 'setMap', map);
+
+  if (map) {
+    this.listenerKeys.push(goog.events.listen(
+        map, ol.ObjectEventType.PROPERTYCHANGE,
+        this.handleMapPropertyChange_, false, this));
+
+    // TODO: to really support map switching, this would need to be reworked
+    if (this.ovmap_.getLayers().getLength() === 0) {
+      this.ovmap_.setLayerGroup(map.getLayerGroup());
+    }
+
+    var view = map.getView();
+    if (view) {
+      this.bindView_(view);
+      if (view.isDef()) {
+        this.ovmap_.updateSize();
+        this.resetExtent_();
+      }
+    }
+  }
+};
+
+
+/**
+ * Handle map property changes.  This only deals with changes to the map's view.
+ * @param {ol.ObjectEvent} event The propertychange event.
+ * @private
+ */
+ol.control.OverviewMap.prototype.handleMapPropertyChange_ = function(event) {
+  if (event.key === ol.MapProperty.VIEW) {
+    var oldView = /** @type {ol.View} */ (event.oldValue);
+    if (oldView) {
+      this.unbindView_(oldView);
+    }
+    var newView = this.getMap().getView();
+    this.bindView_(newView);
+  }
+};
+
+
+/**
+ * Register listeners for view property changes.
+ * @param {ol.View} view The view.
+ * @private
+ */
+ol.control.OverviewMap.prototype.bindView_ = function(view) {
+  goog.events.listen(view,
+      ol.Object.getChangeEventType(ol.ViewProperty.ROTATION),
+      this.handleRotationChanged_, false, this);
+};
+
+
+/**
+ * Unregister listeners for view property changes.
+ * @param {ol.View} view The view.
+ * @private
+ */
+ol.control.OverviewMap.prototype.unbindView_ = function(view) {
+  goog.events.unlisten(view,
+      ol.Object.getChangeEventType(ol.ViewProperty.ROTATION),
+      this.handleRotationChanged_, false, this);
+};
+
+
+/**
+ * Handle rotation changes to the main map.
+ * TODO: This should rotate the extent rectrangle instead of the
+ * overview map's view.
+ * @private
+ */
+ol.control.OverviewMap.prototype.handleRotationChanged_ = function() {
+  this.ovmap_.getView().setRotation(this.getMap().getView().getRotation());
+};
+
+
+/**
+ * Update the overview map element.
+ * @param {ol.MapEvent} mapEvent Map event.
+ * @this {ol.control.OverviewMap}
+ * @api
+ */
+ol.control.OverviewMap.render = function(mapEvent) {
+  this.validateExtent_();
+  this.updateBox_();
+};
+
+
+/**
+ * Reset the overview map extent if the box size (width or
+ * height) is less than the size of the overview map size times minRatio
+ * or is greater than the size of the overview size times maxRatio.
+ *
+ * If the map extent was not reset, the box size can fits in the defined
+ * ratio sizes. This method then checks if is contained inside the overview
+ * map current extent. If not, recenter the overview map to the current
+ * main map center location.
+ * @private
+ */
+ol.control.OverviewMap.prototype.validateExtent_ = function() {
+  var map = this.getMap();
+  var ovmap = this.ovmap_;
+
+  if (!map.isRendered() || !ovmap.isRendered()) {
+    return;
+  }
+
+  var mapSize = map.getSize();
+  goog.asserts.assertArray(mapSize, 'mapSize should be an array');
+
+  var view = map.getView();
+  goog.asserts.assert(view, 'view should be defined');
+  var extent = view.calculateExtent(mapSize);
+
+  var ovmapSize = ovmap.getSize();
+  goog.asserts.assertArray(ovmapSize, 'ovmapSize should be an array');
+
+  var ovview = ovmap.getView();
+  goog.asserts.assert(ovview, 'ovview should be defined');
+  var ovextent = ovview.calculateExtent(ovmapSize);
+
+  var topLeftPixel =
+      ovmap.getPixelFromCoordinate(ol.extent.getTopLeft(extent));
+  var bottomRightPixel =
+      ovmap.getPixelFromCoordinate(ol.extent.getBottomRight(extent));
+  var boxSize = new goog.math.Size(
+      Math.abs(topLeftPixel[0] - bottomRightPixel[0]),
+      Math.abs(topLeftPixel[1] - bottomRightPixel[1]));
+
+  var ovmapWidth = ovmapSize[0];
+  var ovmapHeight = ovmapSize[1];
+
+  if (boxSize.width < ovmapWidth * ol.OVERVIEWMAP_MIN_RATIO ||
+      boxSize.height < ovmapHeight * ol.OVERVIEWMAP_MIN_RATIO ||
+      boxSize.width > ovmapWidth * ol.OVERVIEWMAP_MAX_RATIO ||
+      boxSize.height > ovmapHeight * ol.OVERVIEWMAP_MAX_RATIO) {
+    this.resetExtent_();
+  } else if (!ol.extent.containsExtent(ovextent, extent)) {
+    this.recenter_();
+  }
+};
+
+
+/**
+ * Reset the overview map extent to half calculated min and max ratio times
+ * the extent of the main map.
+ * @private
+ */
+ol.control.OverviewMap.prototype.resetExtent_ = function() {
+  if (ol.OVERVIEWMAP_MAX_RATIO === 0 || ol.OVERVIEWMAP_MIN_RATIO === 0) {
+    return;
+  }
+
+  var map = this.getMap();
+  var ovmap = this.ovmap_;
+
+  var mapSize = map.getSize();
+  goog.asserts.assertArray(mapSize, 'mapSize should be an array');
+
+  var view = map.getView();
+  goog.asserts.assert(view, 'view should be defined');
+  var extent = view.calculateExtent(mapSize);
+
+  var ovmapSize = ovmap.getSize();
+  goog.asserts.assertArray(ovmapSize, 'ovmapSize should be an array');
+
+  var ovview = ovmap.getView();
+  goog.asserts.assert(ovview, 'ovview should be defined');
+
+  // get how many times the current map overview could hold different
+  // box sizes using the min and max ratio, pick the step in the middle used
+  // to calculate the extent from the main map to set it to the overview map,
+  var steps = Math.log(
+      ol.OVERVIEWMAP_MAX_RATIO / ol.OVERVIEWMAP_MIN_RATIO) / Math.LN2;
+  var ratio = 1 / (Math.pow(2, steps / 2) * ol.OVERVIEWMAP_MIN_RATIO);
+  ol.extent.scaleFromCenter(extent, ratio);
+  ovview.fit(extent, ovmapSize);
+};
+
+
+/**
+ * Set the center of the overview map to the map center without changing its
+ * resolution.
+ * @private
+ */
+ol.control.OverviewMap.prototype.recenter_ = function() {
+  var map = this.getMap();
+  var ovmap = this.ovmap_;
+
+  var view = map.getView();
+  goog.asserts.assert(view, 'view should be defined');
+
+  var ovview = ovmap.getView();
+  goog.asserts.assert(ovview, 'ovview should be defined');
+
+  ovview.setCenter(view.getCenter());
+};
+
+
+/**
+ * Update the box using the main map extent
+ * @private
+ */
+ol.control.OverviewMap.prototype.updateBox_ = function() {
+  var map = this.getMap();
+  var ovmap = this.ovmap_;
+
+  if (!map.isRendered() || !ovmap.isRendered()) {
+    return;
+  }
+
+  var mapSize = map.getSize();
+  goog.asserts.assertArray(mapSize, 'mapSize should be an array');
+
+  var view = map.getView();
+  goog.asserts.assert(view, 'view should be defined');
+
+  var ovview = ovmap.getView();
+  goog.asserts.assert(ovview, 'ovview should be defined');
+
+  var ovmapSize = ovmap.getSize();
+  goog.asserts.assertArray(ovmapSize, 'ovmapSize should be an array');
+
+  var rotation = view.getRotation();
+  goog.asserts.assert(rotation !== undefined, 'rotation should be defined');
+
+  var overlay = this.boxOverlay_;
+  var box = this.boxOverlay_.getElement();
+  var extent = view.calculateExtent(mapSize);
+  var ovresolution = ovview.getResolution();
+  var bottomLeft = ol.extent.getBottomLeft(extent);
+  var topRight = ol.extent.getTopRight(extent);
+
+  // set position using bottom left coordinates
+  var rotateBottomLeft = this.calculateCoordinateRotate_(rotation, bottomLeft);
+  overlay.setPosition(rotateBottomLeft);
+
+  // set box size calculated from map extent size and overview map resolution
+  if (box) {
+    var boxWidth = Math.abs((bottomLeft[0] - topRight[0]) / ovresolution);
+    var boxHeight = Math.abs((topRight[1] - bottomLeft[1]) / ovresolution);
+    goog.style.setBorderBoxSize(box, new goog.math.Size(
+        boxWidth, boxHeight));
+  }
+};
+
+
+/**
+ * @param {number} rotation Target rotation.
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @return {ol.Coordinate|undefined} Coordinate for rotation and center anchor.
+ * @private
+ */
+ol.control.OverviewMap.prototype.calculateCoordinateRotate_ = function(
+    rotation, coordinate) {
+  var coordinateRotate;
+
+  var map = this.getMap();
+  var view = map.getView();
+  goog.asserts.assert(view, 'view should be defined');
+
+  var currentCenter = view.getCenter();
+
+  if (currentCenter) {
+    coordinateRotate = [
+      coordinate[0] - currentCenter[0],
+      coordinate[1] - currentCenter[1]
+    ];
+    ol.coordinate.rotate(coordinateRotate, rotation);
+    ol.coordinate.add(coordinateRotate, currentCenter);
+  }
+  return coordinateRotate;
+};
+
+
+/**
+ * @param {goog.events.BrowserEvent} event The event to handle
+ * @private
+ */
+ol.control.OverviewMap.prototype.handleClick_ = function(event) {
+  event.preventDefault();
+  this.handleToggle_();
+};
+
+
+/**
+ * @private
+ */
+ol.control.OverviewMap.prototype.handleToggle_ = function() {
+  goog.dom.classlist.toggle(this.element, 'ol-collapsed');
+  if (this.collapsed_) {
+    goog.dom.replaceNode(this.collapseLabel_, this.label_);
+  } else {
+    goog.dom.replaceNode(this.label_, this.collapseLabel_);
+  }
+  this.collapsed_ = !this.collapsed_;
+
+  // manage overview map if it had not been rendered before and control
+  // is expanded
+  var ovmap = this.ovmap_;
+  if (!this.collapsed_ && !ovmap.isRendered()) {
+    ovmap.updateSize();
+    this.resetExtent_();
+    goog.events.listenOnce(ovmap, ol.MapEventType.POSTRENDER,
+        function(event) {
+          this.updateBox_();
+        },
+        false, this);
+  }
+};
+
+
+/**
+ * Return `true` if the overview map is collapsible, `false` otherwise.
+ * @return {boolean} True if the widget is collapsible.
+ * @api stable
+ */
+ol.control.OverviewMap.prototype.getCollapsible = function() {
+  return this.collapsible_;
+};
+
+
+/**
+ * Set whether the overview map should be collapsible.
+ * @param {boolean} collapsible True if the widget is collapsible.
+ * @api stable
+ */
+ol.control.OverviewMap.prototype.setCollapsible = function(collapsible) {
+  if (this.collapsible_ === collapsible) {
+    return;
+  }
+  this.collapsible_ = collapsible;
+  goog.dom.classlist.toggle(this.element, 'ol-uncollapsible');
+  if (!collapsible && this.collapsed_) {
+    this.handleToggle_();
+  }
+};
+
+
+/**
+ * Collapse or expand the overview map according to the passed parameter. Will
+ * not do anything if the overview map isn't collapsible or if the current
+ * collapsed state is already the one requested.
+ * @param {boolean} collapsed True if the widget is collapsed.
+ * @api stable
+ */
+ol.control.OverviewMap.prototype.setCollapsed = function(collapsed) {
+  if (!this.collapsible_ || this.collapsed_ === collapsed) {
+    return;
+  }
+  this.handleToggle_();
+};
+
+
+/**
+ * Determine if the overview map is collapsed.
+ * @return {boolean} The overview map is collapsed.
+ * @api stable
+ */
+ol.control.OverviewMap.prototype.getCollapsed = function() {
+  return this.collapsed_;
+};
+
+
+/**
+ * Return the overview map.
+ * @return {ol.Map} Overview map.
+ * @api
+ */
+ol.control.OverviewMap.prototype.getOverviewMap = function() {
+  return this.ovmap_;
+};
+
+goog.provide('ol.control.ScaleLine');
+goog.provide('ol.control.ScaleLineProperty');
+goog.provide('ol.control.ScaleLineUnits');
+
+goog.require('goog.asserts');
+goog.require('goog.dom');
+goog.require('goog.events');
+goog.require('goog.style');
+goog.require('ol');
+goog.require('ol.Object');
+goog.require('ol.TransformFunction');
+goog.require('ol.control.Control');
+goog.require('ol.css');
+goog.require('ol.math');
+goog.require('ol.proj');
+goog.require('ol.proj.METERS_PER_UNIT');
+goog.require('ol.proj.Units');
+goog.require('ol.sphere.NORMAL');
+
+
+/**
+ * @enum {string}
+ */
+ol.control.ScaleLineProperty = {
+  UNITS: 'units'
+};
+
+
+/**
+ * Units for the scale line. Supported values are `'degrees'`, `'imperial'`,
+ * `'nautical'`, `'metric'`, `'us'`.
+ * @enum {string}
+ * @api stable
+ */
+ol.control.ScaleLineUnits = {
+  DEGREES: 'degrees',
+  IMPERIAL: 'imperial',
+  NAUTICAL: 'nautical',
+  METRIC: 'metric',
+  US: 'us'
+};
+
+
+
+/**
+ * @classdesc
+ * A control displaying rough x-axis distances, calculated for the center of the
+ * viewport.
+ * No scale line will be shown when the x-axis distance cannot be calculated in
+ * the view projection (e.g. at or beyond the poles in EPSG:4326).
+ * By default the scale line will show in the bottom left portion of the map,
+ * but this can be changed by using the css selector `.ol-scale-line`.
+ *
+ * @constructor
+ * @extends {ol.control.Control}
+ * @param {olx.control.ScaleLineOptions=} opt_options Scale line options.
+ * @api stable
+ */
+ol.control.ScaleLine = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  var className = options.className ? options.className : 'ol-scale-line';
+
+  /**
+   * @private
+   * @type {Element}
+   */
+  this.innerElement_ = goog.dom.createDom('DIV',
+      className + '-inner');
+
+  /**
+   * @private
+   * @type {Element}
+   */
+  this.element_ = goog.dom.createDom('DIV',
+      className + ' ' + ol.css.CLASS_UNSELECTABLE, this.innerElement_);
+
+  /**
+   * @private
+   * @type {?olx.ViewState}
+   */
+  this.viewState_ = null;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.minWidth_ = options.minWidth !== undefined ? options.minWidth : 64;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.renderedVisible_ = false;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.renderedWidth_ = undefined;
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.renderedHTML_ = '';
+
+  /**
+   * @private
+   * @type {?ol.TransformFunction}
+   */
+  this.toEPSG4326_ = null;
+
+  var render = options.render ? options.render : ol.control.ScaleLine.render;
+
+  goog.base(this, {
+    element: this.element_,
+    render: render,
+    target: options.target
+  });
+
+  goog.events.listen(
+      this, ol.Object.getChangeEventType(ol.control.ScaleLineProperty.UNITS),
+      this.handleUnitsChanged_, false, this);
+
+  this.setUnits(/** @type {ol.control.ScaleLineUnits} */ (options.units) ||
+      ol.control.ScaleLineUnits.METRIC);
+
+};
+goog.inherits(ol.control.ScaleLine, ol.control.Control);
+
+
+/**
+ * @const
+ * @type {Array.<number>}
+ */
+ol.control.ScaleLine.LEADING_DIGITS = [1, 2, 5];
+
+
+/**
+ * Return the units to use in the scale line.
+ * @return {ol.control.ScaleLineUnits|undefined} The units to use in the scale
+ *     line.
+ * @observable
+ * @api stable
+ */
+ol.control.ScaleLine.prototype.getUnits = function() {
+  return /** @type {ol.control.ScaleLineUnits|undefined} */ (
+      this.get(ol.control.ScaleLineProperty.UNITS));
+};
+
+
+/**
+ * Update the scale line element.
+ * @param {ol.MapEvent} mapEvent Map event.
+ * @this {ol.control.ScaleLine}
+ * @api
+ */
+ol.control.ScaleLine.render = function(mapEvent) {
+  var frameState = mapEvent.frameState;
+  if (!frameState) {
+    this.viewState_ = null;
+  } else {
+    this.viewState_ = frameState.viewState;
+  }
+  this.updateElement_();
+};
+
+
+/**
+ * @private
+ */
+ol.control.ScaleLine.prototype.handleUnitsChanged_ = function() {
+  this.updateElement_();
+};
+
+
+/**
+ * Set the units to use in the scale line.
+ * @param {ol.control.ScaleLineUnits} units The units to use in the scale line.
+ * @observable
+ * @api stable
+ */
+ol.control.ScaleLine.prototype.setUnits = function(units) {
+  this.set(ol.control.ScaleLineProperty.UNITS, units);
+};
+
+
+/**
+ * @private
+ */
+ol.control.ScaleLine.prototype.updateElement_ = function() {
+  var viewState = this.viewState_;
+
+  if (!viewState) {
+    if (this.renderedVisible_) {
+      goog.style.setElementShown(this.element_, false);
+      this.renderedVisible_ = false;
+    }
+    return;
+  }
+
+  var center = viewState.center;
+  var projection = viewState.projection;
+  var pointResolution =
+      projection.getPointResolution(viewState.resolution, center);
+  var projectionUnits = projection.getUnits();
+
+  var cosLatitude;
+  var units = this.getUnits();
+  if (projectionUnits == ol.proj.Units.DEGREES &&
+      (units == ol.control.ScaleLineUnits.METRIC ||
+       units == ol.control.ScaleLineUnits.IMPERIAL ||
+       units == ol.control.ScaleLineUnits.US ||
+       units == ol.control.ScaleLineUnits.NAUTICAL)) {
+
+    // Convert pointResolution from degrees to meters
+    this.toEPSG4326_ = null;
+    cosLatitude = Math.cos(ol.math.toRadians(center[1]));
+    pointResolution *= Math.PI * cosLatitude * ol.sphere.NORMAL.radius / 180;
+    projectionUnits = ol.proj.Units.METERS;
+
+  } else if (projectionUnits != ol.proj.Units.DEGREES &&
+      units == ol.control.ScaleLineUnits.DEGREES) {
+
+    // Convert pointResolution from other units to degrees
+    if (!this.toEPSG4326_) {
+      this.toEPSG4326_ = ol.proj.getTransformFromProjections(
+          projection, ol.proj.get('EPSG:4326'));
+    }
+    cosLatitude = Math.cos(ol.math.toRadians(this.toEPSG4326_(center)[1]));
+    var radius = ol.sphere.NORMAL.radius;
+    goog.asserts.assert(ol.proj.METERS_PER_UNIT[projectionUnits],
+        'Meters per unit should be defined for the projection unit');
+    radius /= ol.proj.METERS_PER_UNIT[projectionUnits];
+    pointResolution *= 180 / (Math.PI * cosLatitude * radius);
+    projectionUnits = ol.proj.Units.DEGREES;
+
+  } else {
+    this.toEPSG4326_ = null;
+  }
+
+  goog.asserts.assert(
+      ((units == ol.control.ScaleLineUnits.METRIC ||
+        units == ol.control.ScaleLineUnits.IMPERIAL ||
+        units == ol.control.ScaleLineUnits.US ||
+        units == ol.control.ScaleLineUnits.NAUTICAL) &&
+       projectionUnits == ol.proj.Units.METERS) ||
+      (units == ol.control.ScaleLineUnits.DEGREES &&
+       projectionUnits == ol.proj.Units.DEGREES),
+      'Scale line units and projection units should match');
+
+  var nominalCount = this.minWidth_ * pointResolution;
+  var suffix = '';
+  if (units == ol.control.ScaleLineUnits.DEGREES) {
+    if (nominalCount < 1 / 60) {
+      suffix = '\u2033'; // seconds
+      pointResolution *= 3600;
+    } else if (nominalCount < 1) {
+      suffix = '\u2032'; // minutes
+      pointResolution *= 60;
+    } else {
+      suffix = '\u00b0'; // degrees
+    }
+  } else if (units == ol.control.ScaleLineUnits.IMPERIAL) {
+    if (nominalCount < 0.9144) {
+      suffix = 'in';
+      pointResolution /= 0.0254;
+    } else if (nominalCount < 1609.344) {
+      suffix = 'ft';
+      pointResolution /= 0.3048;
+    } else {
+      suffix = 'mi';
+      pointResolution /= 1609.344;
+    }
+  } else if (units == ol.control.ScaleLineUnits.NAUTICAL) {
+    pointResolution /= 1852;
+    suffix = 'nm';
+  } else if (units == ol.control.ScaleLineUnits.METRIC) {
+    if (nominalCount < 1) {
+      suffix = 'mm';
+      pointResolution *= 1000;
+    } else if (nominalCount < 1000) {
+      suffix = 'm';
+    } else {
+      suffix = 'km';
+      pointResolution /= 1000;
+    }
+  } else if (units == ol.control.ScaleLineUnits.US) {
+    if (nominalCount < 0.9144) {
+      suffix = 'in';
+      pointResolution *= 39.37;
+    } else if (nominalCount < 1609.344) {
+      suffix = 'ft';
+      pointResolution /= 0.30480061;
+    } else {
+      suffix = 'mi';
+      pointResolution /= 1609.3472;
+    }
+  } else {
+    goog.asserts.fail('Scale line element cannot be updated');
+  }
+
+  var i = 3 * Math.floor(
+      Math.log(this.minWidth_ * pointResolution) / Math.log(10));
+  var count, width;
+  while (true) {
+    count = ol.control.ScaleLine.LEADING_DIGITS[i % 3] *
+        Math.pow(10, Math.floor(i / 3));
+    width = Math.round(count / pointResolution);
+    if (isNaN(width)) {
+      goog.style.setElementShown(this.element_, false);
+      this.renderedVisible_ = false;
+      return;
+    } else if (width >= this.minWidth_) {
+      break;
+    }
+    ++i;
+  }
+
+  var html = count + ' ' + suffix;
+  if (this.renderedHTML_ != html) {
+    this.innerElement_.innerHTML = html;
+    this.renderedHTML_ = html;
+  }
+
+  if (this.renderedWidth_ != width) {
+    this.innerElement_.style.width = width + 'px';
+    this.renderedWidth_ = width;
+  }
+
+  if (!this.renderedVisible_) {
+    goog.style.setElementShown(this.element_, true);
+    this.renderedVisible_ = true;
+  }
+
+};
+
+// Copyright 2005 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Class to create objects which want to handle multiple events
+ * and have their listeners easily cleaned up via a dispose method.
+ *
+ * Example:
+ * <pre>
+ * function Something() {
+ *   Something.base(this);
+ *
+ *   ... set up object ...
+ *
+ *   // Add event listeners
+ *   this.listen(this.starEl, goog.events.EventType.CLICK, this.handleStar);
+ *   this.listen(this.headerEl, goog.events.EventType.CLICK, this.expand);
+ *   this.listen(this.collapseEl, goog.events.EventType.CLICK, this.collapse);
+ *   this.listen(this.infoEl, goog.events.EventType.MOUSEOVER, this.showHover);
+ *   this.listen(this.infoEl, goog.events.EventType.MOUSEOUT, this.hideHover);
+ * }
+ * goog.inherits(Something, goog.events.EventHandler);
+ *
+ * Something.prototype.disposeInternal = function() {
+ *   Something.base(this, 'disposeInternal');
+ *   goog.dom.removeNode(this.container);
+ * };
+ *
+ *
+ * // Then elsewhere:
+ *
+ * var activeSomething = null;
+ * function openSomething() {
+ *   activeSomething = new Something();
+ * }
+ *
+ * function closeSomething() {
+ *   if (activeSomething) {
+ *     activeSomething.dispose();  // Remove event listeners
+ *     activeSomething = null;
+ *   }
+ * }
+ * </pre>
+ *
+ */
+
+goog.provide('goog.events.EventHandler');
+
+goog.require('goog.Disposable');
+goog.require('goog.events');
+goog.require('goog.object');
+
+goog.forwardDeclare('goog.events.EventWrapper');
+
+
+
+/**
+ * Super class for objects that want to easily manage a number of event
+ * listeners.  It allows a short cut to listen and also provides a quick way
+ * to remove all events listeners belonging to this object.
+ * @param {SCOPE=} opt_scope Object in whose scope to call the listeners.
+ * @constructor
+ * @extends {goog.Disposable}
+ * @template SCOPE
+ */
+goog.events.EventHandler = function(opt_scope) {
+  goog.Disposable.call(this);
+  // TODO(mknichel): Rename this to this.scope_ and fix the classes in google3
+  // that access this private variable. :(
+  this.handler_ = opt_scope;
+
+  /**
+   * Keys for events that are being listened to.
+   * @type {!Object<!goog.events.Key>}
+   * @private
+   */
+  this.keys_ = {};
+};
+goog.inherits(goog.events.EventHandler, goog.Disposable);
+
+
+/**
+ * Utility array used to unify the cases of listening for an array of types
+ * and listening for a single event, without using recursion or allocating
+ * an array each time.
+ * @type {!Array<string>}
+ * @const
+ * @private
+ */
+goog.events.EventHandler.typeArray_ = [];
+
+
+/**
+ * Listen to an event on a Listenable.  If the function is omitted then the
+ * EventHandler's handleEvent method will be used.
+ * @param {goog.events.ListenableType} src Event source.
+ * @param {string|Array<string>|
+ *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}
+ *     type Event type to listen for or array of event types.
+ * @param {function(this:SCOPE, EVENTOBJ):?|{handleEvent:function(?):?}|null=}
+ *     opt_fn Optional callback function to be used as the listener or an object
+ *     with handleEvent function.
+ * @param {boolean=} opt_capture Optional whether to use capture phase.
+ * @return {!goog.events.EventHandler<SCOPE>} This object, allowing for
+ *     chaining of calls.
+ * @template EVENTOBJ
+ */
+goog.events.EventHandler.prototype.listen = function(
+    src, type, opt_fn, opt_capture) {
+  return this.listen_(src, type, opt_fn, opt_capture);
+};
+
+
+/**
+ * Listen to an event on a Listenable.  If the function is omitted then the
+ * EventHandler's handleEvent method will be used.
+ * @param {goog.events.ListenableType} src Event source.
+ * @param {string|Array<string>|
+ *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}
+ *     type Event type to listen for or array of event types.
+ * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(this:T, ?):?}|
+ *     null|undefined} fn Optional callback function to be used as the
+ *     listener or an object with handleEvent function.
+ * @param {boolean|undefined} capture Optional whether to use capture phase.
+ * @param {T} scope Object in whose scope to call the listener.
+ * @return {!goog.events.EventHandler<SCOPE>} This object, allowing for
+ *     chaining of calls.
+ * @template T,EVENTOBJ
+ */
+goog.events.EventHandler.prototype.listenWithScope = function(
+    src, type, fn, capture, scope) {
+  // TODO(mknichel): Deprecate this function.
+  return this.listen_(src, type, fn, capture, scope);
+};
+
+
+/**
+ * Listen to an event on a Listenable.  If the function is omitted then the
+ * EventHandler's handleEvent method will be used.
+ * @param {goog.events.ListenableType} src Event source.
+ * @param {string|Array<string>|
+ *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}
+ *     type Event type to listen for or array of event types.
+ * @param {function(EVENTOBJ):?|{handleEvent:function(?):?}|null=} opt_fn
+ *     Optional callback function to be used as the listener or an object with
+ *     handleEvent function.
+ * @param {boolean=} opt_capture Optional whether to use capture phase.
+ * @param {Object=} opt_scope Object in whose scope to call the listener.
+ * @return {!goog.events.EventHandler<SCOPE>} This object, allowing for
+ *     chaining of calls.
+ * @template EVENTOBJ
+ * @private
+ */
+goog.events.EventHandler.prototype.listen_ = function(src, type, opt_fn,
+                                                      opt_capture,
+                                                      opt_scope) {
+  if (!goog.isArray(type)) {
+    if (type) {
+      goog.events.EventHandler.typeArray_[0] = type.toString();
+    }
+    type = goog.events.EventHandler.typeArray_;
+  }
+  for (var i = 0; i < type.length; i++) {
+    var listenerObj = goog.events.listen(
+        src, type[i], opt_fn || this.handleEvent,
+        opt_capture || false,
+        opt_scope || this.handler_ || this);
+
+    if (!listenerObj) {
+      // When goog.events.listen run on OFF_AND_FAIL or OFF_AND_SILENT
+      // (goog.events.CaptureSimulationMode) in IE8-, it will return null
+      // value.
+      return this;
+    }
+
+    var key = listenerObj.key;
+    this.keys_[key] = listenerObj;
+  }
+
+  return this;
+};
+
+
+/**
+ * Listen to an event on a Listenable.  If the function is omitted, then the
+ * EventHandler's handleEvent method will be used. After the event has fired the
+ * event listener is removed from the target. If an array of event types is
+ * provided, each event type will be listened to once.
+ * @param {goog.events.ListenableType} src Event source.
+ * @param {string|Array<string>|
+ *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}
+ *     type Event type to listen for or array of event types.
+ * @param {function(this:SCOPE, EVENTOBJ):?|{handleEvent:function(?):?}|null=} opt_fn
+ *    Optional callback function to be used as the listener or an object with
+ *    handleEvent function.
+ * @param {boolean=} opt_capture Optional whether to use capture phase.
+ * @return {!goog.events.EventHandler<SCOPE>} This object, allowing for
+ *     chaining of calls.
+ * @template EVENTOBJ
+ */
+goog.events.EventHandler.prototype.listenOnce = function(
+    src, type, opt_fn, opt_capture) {
+  return this.listenOnce_(src, type, opt_fn, opt_capture);
+};
+
+
+/**
+ * Listen to an event on a Listenable.  If the function is omitted, then the
+ * EventHandler's handleEvent method will be used. After the event has fired the
+ * event listener is removed from the target. If an array of event types is
+ * provided, each event type will be listened to once.
+ * @param {goog.events.ListenableType} src Event source.
+ * @param {string|Array<string>|
+ *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}
+ *     type Event type to listen for or array of event types.
+ * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(this:T, ?):?}|
+ *     null|undefined} fn Optional callback function to be used as the
+ *     listener or an object with handleEvent function.
+ * @param {boolean|undefined} capture Optional whether to use capture phase.
+ * @param {T} scope Object in whose scope to call the listener.
+ * @return {!goog.events.EventHandler<SCOPE>} This object, allowing for
+ *     chaining of calls.
+ * @template T,EVENTOBJ
+ */
+goog.events.EventHandler.prototype.listenOnceWithScope = function(
+    src, type, fn, capture, scope) {
+  // TODO(mknichel): Deprecate this function.
+  return this.listenOnce_(src, type, fn, capture, scope);
+};
+
+
+/**
+ * Listen to an event on a Listenable.  If the function is omitted, then the
+ * EventHandler's handleEvent method will be used. After the event has fired
+ * the event listener is removed from the target. If an array of event types is
+ * provided, each event type will be listened to once.
+ * @param {goog.events.ListenableType} src Event source.
+ * @param {string|Array<string>|
+ *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}
+ *     type Event type to listen for or array of event types.
+ * @param {function(EVENTOBJ):?|{handleEvent:function(?):?}|null=} opt_fn
+ *    Optional callback function to be used as the listener or an object with
+ *    handleEvent function.
+ * @param {boolean=} opt_capture Optional whether to use capture phase.
+ * @param {Object=} opt_scope Object in whose scope to call the listener.
+ * @return {!goog.events.EventHandler<SCOPE>} This object, allowing for
+ *     chaining of calls.
+ * @template EVENTOBJ
+ * @private
+ */
+goog.events.EventHandler.prototype.listenOnce_ = function(
+    src, type, opt_fn, opt_capture, opt_scope) {
+  if (goog.isArray(type)) {
+    for (var i = 0; i < type.length; i++) {
+      this.listenOnce_(src, type[i], opt_fn, opt_capture, opt_scope);
+    }
+  } else {
+    var listenerObj = goog.events.listenOnce(
+        src, type, opt_fn || this.handleEvent, opt_capture,
+        opt_scope || this.handler_ || this);
+    if (!listenerObj) {
+      // When goog.events.listen run on OFF_AND_FAIL or OFF_AND_SILENT
+      // (goog.events.CaptureSimulationMode) in IE8-, it will return null
+      // value.
+      return this;
+    }
+
+    var key = listenerObj.key;
+    this.keys_[key] = listenerObj;
+  }
+
+  return this;
+};
+
+
+/**
+ * Adds an event listener with a specific event wrapper on a DOM Node or an
+ * object that has implemented {@link goog.events.EventTarget}. A listener can
+ * only be added once to an object.
+ *
+ * @param {EventTarget|goog.events.EventTarget} src The node to listen to
+ *     events on.
+ * @param {goog.events.EventWrapper} wrapper Event wrapper to use.
+ * @param {function(this:SCOPE, ?):?|{handleEvent:function(?):?}|null} listener
+ *     Callback method, or an object with a handleEvent function.
+ * @param {boolean=} opt_capt Whether to fire in capture phase (defaults to
+ *     false).
+ * @return {!goog.events.EventHandler<SCOPE>} This object, allowing for
+ *     chaining of calls.
+ */
+goog.events.EventHandler.prototype.listenWithWrapper = function(
+    src, wrapper, listener, opt_capt) {
+  // TODO(mknichel): Remove the opt_scope from this function and then
+  // templatize it.
+  return this.listenWithWrapper_(src, wrapper, listener, opt_capt);
+};
+
+
+/**
+ * Adds an event listener with a specific event wrapper on a DOM Node or an
+ * object that has implemented {@link goog.events.EventTarget}. A listener can
+ * only be added once to an object.
+ *
+ * @param {EventTarget|goog.events.EventTarget} src The node to listen to
+ *     events on.
+ * @param {goog.events.EventWrapper} wrapper Event wrapper to use.
+ * @param {function(this:T, ?):?|{handleEvent:function(this:T, ?):?}|null}
+ *     listener Optional callback function to be used as the
+ *     listener or an object with handleEvent function.
+ * @param {boolean|undefined} capture Optional whether to use capture phase.
+ * @param {T} scope Object in whose scope to call the listener.
+ * @return {!goog.events.EventHandler<SCOPE>} This object, allowing for
+ *     chaining of calls.
+ * @template T
+ */
+goog.events.EventHandler.prototype.listenWithWrapperAndScope = function(
+    src, wrapper, listener, capture, scope) {
+  // TODO(mknichel): Deprecate this function.
+  return this.listenWithWrapper_(src, wrapper, listener, capture, scope);
+};
+
+
+/**
+ * Adds an event listener with a specific event wrapper on a DOM Node or an
+ * object that has implemented {@link goog.events.EventTarget}. A listener can
+ * only be added once to an object.
+ *
+ * @param {EventTarget|goog.events.EventTarget} src The node to listen to
+ *     events on.
+ * @param {goog.events.EventWrapper} wrapper Event wrapper to use.
+ * @param {function(?):?|{handleEvent:function(?):?}|null} listener Callback
+ *     method, or an object with a handleEvent function.
+ * @param {boolean=} opt_capt Whether to fire in capture phase (defaults to
+ *     false).
+ * @param {Object=} opt_scope Element in whose scope to call the listener.
+ * @return {!goog.events.EventHandler<SCOPE>} This object, allowing for
+ *     chaining of calls.
+ * @private
+ */
+goog.events.EventHandler.prototype.listenWithWrapper_ = function(
+    src, wrapper, listener, opt_capt, opt_scope) {
+  wrapper.listen(src, listener, opt_capt, opt_scope || this.handler_ || this,
+                 this);
+  return this;
+};
+
+
+/**
+ * @return {number} Number of listeners registered by this handler.
+ */
+goog.events.EventHandler.prototype.getListenerCount = function() {
+  var count = 0;
+  for (var key in this.keys_) {
+    if (Object.prototype.hasOwnProperty.call(this.keys_, key)) {
+      count++;
+    }
+  }
+  return count;
+};
+
+
+/**
+ * Unlistens on an event.
+ * @param {goog.events.ListenableType} src Event source.
+ * @param {string|Array<string>|
+ *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}
+ *     type Event type or array of event types to unlisten to.
+ * @param {function(EVENTOBJ):?|{handleEvent:function(?):?}|null=} opt_fn
+ *     Optional callback function to be used as the listener or an object with
+ *     handleEvent function.
+ * @param {boolean=} opt_capture Optional whether to use capture phase.
+ * @param {Object=} opt_scope Object in whose scope to call the listener.
+ * @return {!goog.events.EventHandler} This object, allowing for chaining of
+ *     calls.
+ * @template EVENTOBJ
+ */
+goog.events.EventHandler.prototype.unlisten = function(src, type, opt_fn,
+                                                       opt_capture,
+                                                       opt_scope) {
+  if (goog.isArray(type)) {
+    for (var i = 0; i < type.length; i++) {
+      this.unlisten(src, type[i], opt_fn, opt_capture, opt_scope);
+    }
+  } else {
+    var listener = goog.events.getListener(src, type,
+        opt_fn || this.handleEvent,
+        opt_capture, opt_scope || this.handler_ || this);
+
+    if (listener) {
+      goog.events.unlistenByKey(listener);
+      delete this.keys_[listener.key];
+    }
+  }
+
+  return this;
+};
+
+
+/**
+ * Removes an event listener which was added with listenWithWrapper().
+ *
+ * @param {EventTarget|goog.events.EventTarget} src The target to stop
+ *     listening to events on.
+ * @param {goog.events.EventWrapper} wrapper Event wrapper to use.
+ * @param {function(?):?|{handleEvent:function(?):?}|null} listener The
+ *     listener function to remove.
+ * @param {boolean=} opt_capt In DOM-compliant browsers, this determines
+ *     whether the listener is fired during the capture or bubble phase of the
+ *     event.
+ * @param {Object=} opt_scope Element in whose scope to call the listener.
+ * @return {!goog.events.EventHandler} This object, allowing for chaining of
+ *     calls.
+ */
+goog.events.EventHandler.prototype.unlistenWithWrapper = function(src, wrapper,
+    listener, opt_capt, opt_scope) {
+  wrapper.unlisten(src, listener, opt_capt,
+                   opt_scope || this.handler_ || this, this);
+  return this;
+};
+
+
+/**
+ * Unlistens to all events.
+ */
+goog.events.EventHandler.prototype.removeAll = function() {
+  goog.object.forEach(this.keys_, function(listenerObj, key) {
+    if (this.keys_.hasOwnProperty(key)) {
+      goog.events.unlistenByKey(listenerObj);
+    }
+  }, this);
+
+  this.keys_ = {};
+};
+
+
+/**
+ * Disposes of this EventHandler and removes all listeners that it registered.
+ * @override
+ * @protected
+ */
+goog.events.EventHandler.prototype.disposeInternal = function() {
+  goog.events.EventHandler.superClass_.disposeInternal.call(this);
+  this.removeAll();
+};
+
+
+/**
+ * Default event handler
+ * @param {goog.events.Event} e Event object.
+ */
+goog.events.EventHandler.prototype.handleEvent = function(e) {
+  throw Error('EventHandler.handleEvent not implemented');
+};
+
+// Copyright 2012 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Bidi utility functions.
+ *
+ */
+
+goog.provide('goog.style.bidi');
+
+goog.require('goog.dom');
+goog.require('goog.style');
+goog.require('goog.userAgent');
+
+
+/**
+ * Returns the normalized scrollLeft position for a scrolled element.
+ * @param {Element} element The scrolled element.
+ * @return {number} The number of pixels the element is scrolled. 0 indicates
+ *     that the element is not scrolled at all (which, in general, is the
+ *     left-most position in ltr and the right-most position in rtl).
+ */
+goog.style.bidi.getScrollLeft = function(element) {
+  var isRtl = goog.style.isRightToLeft(element);
+  if (isRtl && goog.userAgent.GECKO) {
+    // ScrollLeft starts at 0 and then goes negative as the element is scrolled
+    // towards the left.
+    return -element.scrollLeft;
+  } else if (isRtl &&
+             !(goog.userAgent.IE && goog.userAgent.isVersionOrHigher('8'))) {
+    // ScrollLeft starts at the maximum positive value and decreases towards
+    // 0 as the element is scrolled towards the left. However, for overflow
+    // visible, there is no scrollLeft and the value always stays correctly at 0
+    var overflowX = goog.style.getComputedOverflowX(element);
+    if (overflowX == 'visible') {
+      return element.scrollLeft;
+    } else {
+      return element.scrollWidth - element.clientWidth - element.scrollLeft;
+    }
+  }
+  // ScrollLeft behavior is identical in rtl and ltr, it starts at 0 and
+  // increases as the element is scrolled away from the start.
+  return element.scrollLeft;
+};
+
+
+/**
+ * Returns the "offsetStart" of an element, analagous to offsetLeft but
+ * normalized for right-to-left environments and various browser
+ * inconsistencies. This value returned can always be passed to setScrollOffset
+ * to scroll to an element's left edge in a left-to-right offsetParent or
+ * right edge in a right-to-left offsetParent.
+ *
+ * For example, here offsetStart is 10px in an LTR environment and 5px in RTL:
+ *
+ * <pre>
+ * |          xxxxxxxxxx     |
+ *  ^^^^^^^^^^   ^^^^   ^^^^^
+ *     10px      elem    5px
+ * </pre>
+ *
+ * If an element is positioned before the start of its offsetParent, the
+ * startOffset may be negative.  This can be used with setScrollOffset to
+ * reliably scroll to an element:
+ *
+ * <pre>
+ * var scrollOffset = goog.style.bidi.getOffsetStart(element);
+ * goog.style.bidi.setScrollOffset(element.offsetParent, scrollOffset);
+ * </pre>
+ *
+ * @see setScrollOffset
+ *
+ * @param {Element} element The element for which we need to determine the
+ *     offsetStart position.
+ * @return {number} The offsetStart for that element.
+ */
+goog.style.bidi.getOffsetStart = function(element) {
+  element = /** @type {!HTMLElement} */ (element);
+  var offsetLeftForReal = element.offsetLeft;
+
+  // The element might not have an offsetParent.
+  // For example, the node might not be attached to the DOM tree,
+  // and position:fixed children do not have an offset parent.
+  // Just try to do the best we can with what we have.
+  var bestParent = element.offsetParent;
+
+  if (!bestParent && goog.style.getComputedPosition(element) == 'fixed') {
+    bestParent = goog.dom.getOwnerDocument(element).documentElement;
+  }
+
+  // Just give up in this case.
+  if (!bestParent) {
+    return offsetLeftForReal;
+  }
+
+  if (goog.userAgent.GECKO) {
+    // When calculating an element's offsetLeft, Firefox erroneously subtracts
+    // the border width from the actual distance.  So we need to add it back.
+    var borderWidths = goog.style.getBorderBox(bestParent);
+    offsetLeftForReal += borderWidths.left;
+  } else if (goog.userAgent.isDocumentModeOrHigher(8) &&
+             !goog.userAgent.isDocumentModeOrHigher(9)) {
+    // When calculating an element's offsetLeft, IE8/9-Standards Mode
+    // erroneously adds the border width to the actual distance.  So we need to
+    // subtract it.
+    var borderWidths = goog.style.getBorderBox(bestParent);
+    offsetLeftForReal -= borderWidths.left;
+  }
+
+  if (goog.style.isRightToLeft(bestParent)) {
+    // Right edge of the element relative to the left edge of its parent.
+    var elementRightOffset = offsetLeftForReal + element.offsetWidth;
+
+    // Distance from the parent's right edge to the element's right edge.
+    return bestParent.clientWidth - elementRightOffset;
+  }
+
+  return offsetLeftForReal;
+};
+
+
+/**
+ * Sets the element's scrollLeft attribute so it is correctly scrolled by
+ * offsetStart pixels.  This takes into account whether the element is RTL and
+ * the nuances of different browsers.  To scroll to the "beginning" of an
+ * element use getOffsetStart to obtain the element's offsetStart value and then
+ * pass the value to setScrollOffset.
+ * @see getOffsetStart
+ * @param {Element} element The element to set scrollLeft on.
+ * @param {number} offsetStart The number of pixels to scroll the element.
+ *     If this value is < 0, 0 is used.
+ */
+goog.style.bidi.setScrollOffset = function(element, offsetStart) {
+  offsetStart = Math.max(offsetStart, 0);
+  // In LTR and in "mirrored" browser RTL (such as IE), we set scrollLeft to
+  // the number of pixels to scroll.
+  // Otherwise, in RTL, we need to account for different browser behavior.
+  if (!goog.style.isRightToLeft(element)) {
+    element.scrollLeft = offsetStart;
+  } else if (goog.userAgent.GECKO) {
+    // Negative scroll-left positions in RTL.
+    element.scrollLeft = -offsetStart;
+  } else if (!(goog.userAgent.IE && goog.userAgent.isVersionOrHigher('8'))) {
+    // Take the current scrollLeft value and move to the right by the
+    // offsetStart to get to the left edge of the element, and then by
+    // the clientWidth of the element to get to the right edge.
+    element.scrollLeft =
+        element.scrollWidth - offsetStart - element.clientWidth;
+  } else {
+    element.scrollLeft = offsetStart;
+  }
+};
+
+
+/**
+ * Sets the element's left style attribute in LTR or right style attribute in
+ * RTL.  Also clears the left attribute in RTL and the right attribute in LTR.
+ * @param {Element} elem The element to position.
+ * @param {number} left The left position in LTR; will be set as right in RTL.
+ * @param {?number} top The top position.  If null only the left/right is set.
+ * @param {boolean} isRtl Whether we are in RTL mode.
+ */
+goog.style.bidi.setPosition = function(elem, left, top, isRtl) {
+  if (!goog.isNull(top)) {
+    elem.style.top = top + 'px';
+  }
+  if (isRtl) {
+    elem.style.right = left + 'px';
+    elem.style.left = '';
+  } else {
+    elem.style.left = left + 'px';
+    elem.style.right = '';
+  }
+};
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Drag Utilities.
+ *
+ * Provides extensible functionality for drag & drop behaviour.
+ *
+ * @see ../demos/drag.html
+ * @see ../demos/dragger.html
+ */
+
+
+goog.provide('goog.fx.DragEvent');
+goog.provide('goog.fx.Dragger');
+goog.provide('goog.fx.Dragger.EventType');
+
+goog.require('goog.dom');
+goog.require('goog.dom.TagName');
+goog.require('goog.events');
+goog.require('goog.events.Event');
+goog.require('goog.events.EventHandler');
+goog.require('goog.events.EventTarget');
+goog.require('goog.events.EventType');
+goog.require('goog.math.Coordinate');
+goog.require('goog.math.Rect');
+goog.require('goog.style');
+goog.require('goog.style.bidi');
+goog.require('goog.userAgent');
+
+
+
+/**
+ * A class that allows mouse or touch-based dragging (moving) of an element
+ *
+ * @param {Element} target The element that will be dragged.
+ * @param {Element=} opt_handle An optional handle to control the drag, if null
+ *     the target is used.
+ * @param {goog.math.Rect=} opt_limits Object containing left, top, width,
+ *     and height.
+ *
+ * @extends {goog.events.EventTarget}
+ * @constructor
+ * @struct
+ */
+goog.fx.Dragger = function(target, opt_handle, opt_limits) {
+  goog.fx.Dragger.base(this, 'constructor');
+
+  /**
+   * Reference to drag target element.
+   * @type {?Element}
+   */
+  this.target = target;
+
+  /**
+   * Reference to the handler that initiates the drag.
+   * @type {?Element}
+   */
+  this.handle = opt_handle || target;
+
+  /**
+   * Object representing the limits of the drag region.
+   * @type {goog.math.Rect}
+   */
+  this.limits = opt_limits || new goog.math.Rect(NaN, NaN, NaN, NaN);
+
+  /**
+   * Reference to a document object to use for the events.
+   * @private {Document}
+   */
+  this.document_ = goog.dom.getOwnerDocument(target);
+
+  /** @private {!goog.events.EventHandler} */
+  this.eventHandler_ = new goog.events.EventHandler(this);
+  this.registerDisposable(this.eventHandler_);
+
+  /**
+   * Whether the element is rendered right-to-left. We initialize this lazily.
+   * @private {boolean|undefined}}
+   */
+  this.rightToLeft_;
+
+  /**
+   * Current x position of mouse or touch relative to viewport.
+   * @type {number}
+   */
+  this.clientX = 0;
+
+  /**
+   * Current y position of mouse or touch relative to viewport.
+   * @type {number}
+   */
+  this.clientY = 0;
+
+  /**
+   * Current x position of mouse or touch relative to screen. Deprecated because
+   * it doesn't take into affect zoom level or pixel density.
+   * @type {number}
+   * @deprecated Consider switching to clientX instead.
+   */
+  this.screenX = 0;
+
+  /**
+   * Current y position of mouse or touch relative to screen. Deprecated because
+   * it doesn't take into affect zoom level or pixel density.
+   * @type {number}
+   * @deprecated Consider switching to clientY instead.
+   */
+  this.screenY = 0;
+
+  /**
+   * The x position where the first mousedown or touchstart occurred.
+   * @type {number}
+   */
+  this.startX = 0;
+
+  /**
+   * The y position where the first mousedown or touchstart occurred.
+   * @type {number}
+   */
+  this.startY = 0;
+
+  /**
+   * Current x position of drag relative to target's parent.
+   * @type {number}
+   */
+  this.deltaX = 0;
+
+  /**
+   * Current y position of drag relative to target's parent.
+   * @type {number}
+   */
+  this.deltaY = 0;
+
+  /**
+   * The current page scroll value.
+   * @type {?goog.math.Coordinate}
+   */
+  this.pageScroll;
+
+  /**
+   * Whether dragging is currently enabled.
+   * @private {boolean}
+   */
+  this.enabled_ = true;
+
+  /**
+   * Whether object is currently being dragged.
+   * @private {boolean}
+   */
+  this.dragging_ = false;
+
+  /**
+   * Whether mousedown should be default prevented.
+   * @private {boolean}
+   **/
+  this.preventMouseDown_ = true;
+
+  /**
+   * The amount of distance, in pixels, after which a mousedown or touchstart is
+   * considered a drag.
+   * @private {number}
+   */
+  this.hysteresisDistanceSquared_ = 0;
+
+  /**
+   * The SCROLL event target used to make drag element follow scrolling.
+   * @private {?EventTarget}
+   */
+  this.scrollTarget_;
+
+  /**
+   * Whether IE drag events cancelling is on.
+   * @private {boolean}
+   */
+  this.ieDragStartCancellingOn_ = false;
+
+  /**
+   * Whether the dragger implements the changes described in http://b/6324964,
+   * making it truly RTL.  This is a temporary flag to allow clients to
+   * transition to the new behavior at their convenience.  At some point it will
+   * be the default.
+   * @private {boolean}
+   */
+  this.useRightPositioningForRtl_ = false;
+
+  // Add listener. Do not use the event handler here since the event handler is
+  // used for listeners added and removed during the drag operation.
+  goog.events.listen(this.handle,
+      [goog.events.EventType.TOUCHSTART, goog.events.EventType.MOUSEDOWN],
+      this.startDrag, false, this);
+};
+goog.inherits(goog.fx.Dragger, goog.events.EventTarget);
+// Dragger is meant to be extended, but defines most properties on its
+// prototype, thus making it unsuitable for sealing.
+goog.tagUnsealableClass(goog.fx.Dragger);
+
+
+/**
+ * Whether setCapture is supported by the browser.
+ * @type {boolean}
+ * @private
+ */
+goog.fx.Dragger.HAS_SET_CAPTURE_ =
+    // IE and Gecko after 1.9.3 has setCapture
+    // WebKit does not yet: https://bugs.webkit.org/show_bug.cgi?id=27330
+    goog.userAgent.IE ||
+    goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9.3');
+
+
+/**
+ * Creates copy of node being dragged.  This is a utility function to be used
+ * wherever it is inappropriate for the original source to follow the mouse
+ * cursor itself.
+ *
+ * @param {Element} sourceEl Element to copy.
+ * @return {!Element} The clone of {@code sourceEl}.
+ */
+goog.fx.Dragger.cloneNode = function(sourceEl) {
+  var clonedEl = /** @type {Element} */ (sourceEl.cloneNode(true)),
+      origTexts = sourceEl.getElementsByTagName(goog.dom.TagName.TEXTAREA),
+      dragTexts = clonedEl.getElementsByTagName(goog.dom.TagName.TEXTAREA);
+  // Cloning does not copy the current value of textarea elements, so correct
+  // this manually.
+  for (var i = 0; i < origTexts.length; i++) {
+    dragTexts[i].value = origTexts[i].value;
+  }
+  switch (sourceEl.tagName) {
+    case goog.dom.TagName.TR:
+      return goog.dom.createDom(goog.dom.TagName.TABLE, null,
+                                goog.dom.createDom(goog.dom.TagName.TBODY,
+                                                   null, clonedEl));
+    case goog.dom.TagName.TD:
+    case goog.dom.TagName.TH:
+      return goog.dom.createDom(
+          goog.dom.TagName.TABLE, null, goog.dom.createDom(
+              goog.dom.TagName.TBODY, null, goog.dom.createDom(
+                  goog.dom.TagName.TR, null, clonedEl)));
+    case goog.dom.TagName.TEXTAREA:
+      clonedEl.value = sourceEl.value;
+    default:
+      return clonedEl;
+  }
+};
+
+
+/**
+ * Constants for event names.
+ * @enum {string}
+ */
+goog.fx.Dragger.EventType = {
+  // The drag action was canceled before the START event. Possible reasons:
+  // disabled dragger, dragging with the right mouse button or releasing the
+  // button before reaching the hysteresis distance.
+  EARLY_CANCEL: 'earlycancel',
+  START: 'start',
+  BEFOREDRAG: 'beforedrag',
+  DRAG: 'drag',
+  END: 'end'
+};
+
+
+/**
+ * Turns on/off true RTL behavior.  This should be called immediately after
+ * construction.  This is a temporary flag to allow clients to transition
+ * to the new component at their convenience.  At some point true will be the
+ * default.
+ * @param {boolean} useRightPositioningForRtl True if "right" should be used for
+ *     positioning, false if "left" should be used for positioning.
+ */
+goog.fx.Dragger.prototype.enableRightPositioningForRtl =
+    function(useRightPositioningForRtl) {
+  this.useRightPositioningForRtl_ = useRightPositioningForRtl;
+};
+
+
+/**
+ * Returns the event handler, intended for subclass use.
+ * @return {!goog.events.EventHandler<T>} The event handler.
+ * @this {T}
+ * @template T
+ */
+goog.fx.Dragger.prototype.getHandler = function() {
+  // TODO(user): templated "this" values currently result in "this" being
+  // "unknown" in the body of the function.
+  var self = /** @type {goog.fx.Dragger} */ (this);
+  return self.eventHandler_;
+};
+
+
+/**
+ * Sets (or reset) the Drag limits after a Dragger is created.
+ * @param {goog.math.Rect?} limits Object containing left, top, width,
+ *     height for new Dragger limits. If target is right-to-left and
+ *     enableRightPositioningForRtl(true) is called, then rect is interpreted as
+ *     right, top, width, and height.
+ */
+goog.fx.Dragger.prototype.setLimits = function(limits) {
+  this.limits = limits || new goog.math.Rect(NaN, NaN, NaN, NaN);
+};
+
+
+/**
+ * Sets the distance the user has to drag the element before a drag operation is
+ * started.
+ * @param {number} distance The number of pixels after which a mousedown and
+ *     move is considered a drag.
+ */
+goog.fx.Dragger.prototype.setHysteresis = function(distance) {
+  this.hysteresisDistanceSquared_ = Math.pow(distance, 2);
+};
+
+
+/**
+ * Gets the distance the user has to drag the element before a drag operation is
+ * started.
+ * @return {number} distance The number of pixels after which a mousedown and
+ *     move is considered a drag.
+ */
+goog.fx.Dragger.prototype.getHysteresis = function() {
+  return Math.sqrt(this.hysteresisDistanceSquared_);
+};
+
+
+/**
+ * Sets the SCROLL event target to make drag element follow scrolling.
+ *
+ * @param {EventTarget} scrollTarget The event target that dispatches SCROLL
+ *     events.
+ */
+goog.fx.Dragger.prototype.setScrollTarget = function(scrollTarget) {
+  this.scrollTarget_ = scrollTarget;
+};
+
+
+/**
+ * Enables cancelling of built-in IE drag events.
+ * @param {boolean} cancelIeDragStart Whether to enable cancelling of IE
+ *     dragstart event.
+ */
+goog.fx.Dragger.prototype.setCancelIeDragStart = function(cancelIeDragStart) {
+  this.ieDragStartCancellingOn_ = cancelIeDragStart;
+};
+
+
+/**
+ * @return {boolean} Whether the dragger is enabled.
+ */
+goog.fx.Dragger.prototype.getEnabled = function() {
+  return this.enabled_;
+};
+
+
+/**
+ * Set whether dragger is enabled
+ * @param {boolean} enabled Whether dragger is enabled.
+ */
+goog.fx.Dragger.prototype.setEnabled = function(enabled) {
+  this.enabled_ = enabled;
+};
+
+
+/**
+ * Set whether mousedown should be default prevented.
+ * @param {boolean} preventMouseDown Whether mousedown should be default
+ *     prevented.
+ */
+goog.fx.Dragger.prototype.setPreventMouseDown = function(preventMouseDown) {
+  this.preventMouseDown_ = preventMouseDown;
+};
+
+
+/** @override */
+goog.fx.Dragger.prototype.disposeInternal = function() {
+  goog.fx.Dragger.superClass_.disposeInternal.call(this);
+  goog.events.unlisten(this.handle,
+      [goog.events.EventType.TOUCHSTART, goog.events.EventType.MOUSEDOWN],
+      this.startDrag, false, this);
+  this.cleanUpAfterDragging_();
+
+  this.target = null;
+  this.handle = null;
+};
+
+
+/**
+ * Whether the DOM element being manipulated is rendered right-to-left.
+ * @return {boolean} True if the DOM element is rendered right-to-left, false
+ *     otherwise.
+ * @private
+ */
+goog.fx.Dragger.prototype.isRightToLeft_ = function() {
+  if (!goog.isDef(this.rightToLeft_)) {
+    this.rightToLeft_ = goog.style.isRightToLeft(this.target);
+  }
+  return this.rightToLeft_;
+};
+
+
+/**
+ * Event handler that is used to start the drag
+ * @param {goog.events.BrowserEvent} e Event object.
+ */
+goog.fx.Dragger.prototype.startDrag = function(e) {
+  var isMouseDown = e.type == goog.events.EventType.MOUSEDOWN;
+
+  // Dragger.startDrag() can be called by AbstractDragDrop with a mousemove
+  // event and IE does not report pressed mouse buttons on mousemove. Also,
+  // it does not make sense to check for the button if the user is already
+  // dragging.
+
+  if (this.enabled_ && !this.dragging_ &&
+      (!isMouseDown || e.isMouseActionButton())) {
+    if (this.hysteresisDistanceSquared_ == 0) {
+      if (this.fireDragStart_(e)) {
+        this.dragging_ = true;
+        if (this.preventMouseDown_) {
+          e.preventDefault();
+        }
+      } else {
+        // If the start drag is cancelled, don't setup for a drag.
+        return;
+      }
+    } else if (this.preventMouseDown_) {
+      // Need to preventDefault for hysteresis to prevent page getting selected.
+      e.preventDefault();
+    }
+    this.setupDragHandlers();
+
+    this.clientX = this.startX = e.clientX;
+    this.clientY = this.startY = e.clientY;
+    this.screenX = e.screenX;
+    this.screenY = e.screenY;
+    this.computeInitialPosition();
+    this.pageScroll = goog.dom.getDomHelper(this.document_).getDocumentScroll();
+  } else {
+    this.dispatchEvent(goog.fx.Dragger.EventType.EARLY_CANCEL);
+  }
+};
+
+
+/**
+ * Sets up event handlers when dragging starts.
+ * @protected
+ */
+goog.fx.Dragger.prototype.setupDragHandlers = function() {
+  var doc = this.document_;
+  var docEl = doc.documentElement;
+  // Use bubbling when we have setCapture since we got reports that IE has
+  // problems with the capturing events in combination with setCapture.
+  var useCapture = !goog.fx.Dragger.HAS_SET_CAPTURE_;
+
+  this.eventHandler_.listen(doc,
+      [goog.events.EventType.TOUCHMOVE, goog.events.EventType.MOUSEMOVE],
+      this.handleMove_, useCapture);
+  this.eventHandler_.listen(doc,
+      [goog.events.EventType.TOUCHEND, goog.events.EventType.MOUSEUP],
+      this.endDrag, useCapture);
+
+  if (goog.fx.Dragger.HAS_SET_CAPTURE_) {
+    docEl.setCapture(false);
+    this.eventHandler_.listen(docEl,
+                              goog.events.EventType.LOSECAPTURE,
+                              this.endDrag);
+  } else {
+    // Make sure we stop the dragging if the window loses focus.
+    // Don't use capture in this listener because we only want to end the drag
+    // if the actual window loses focus. Since blur events do not bubble we use
+    // a bubbling listener on the window.
+    this.eventHandler_.listen(goog.dom.getWindow(doc),
+                              goog.events.EventType.BLUR,
+                              this.endDrag);
+  }
+
+  if (goog.userAgent.IE && this.ieDragStartCancellingOn_) {
+    // Cancel IE's 'ondragstart' event.
+    this.eventHandler_.listen(doc, goog.events.EventType.DRAGSTART,
+                              goog.events.Event.preventDefault);
+  }
+
+  if (this.scrollTarget_) {
+    this.eventHandler_.listen(this.scrollTarget_, goog.events.EventType.SCROLL,
+                              this.onScroll_, useCapture);
+  }
+};
+
+
+/**
+ * Fires a goog.fx.Dragger.EventType.START event.
+ * @param {goog.events.BrowserEvent} e Browser event that triggered the drag.
+ * @return {boolean} False iff preventDefault was called on the DragEvent.
+ * @private
+ */
+goog.fx.Dragger.prototype.fireDragStart_ = function(e) {
+  return this.dispatchEvent(new goog.fx.DragEvent(
+      goog.fx.Dragger.EventType.START, this, e.clientX, e.clientY, e));
+};
+
+
+/**
+ * Unregisters the event handlers that are only active during dragging, and
+ * releases mouse capture.
+ * @private
+ */
+goog.fx.Dragger.prototype.cleanUpAfterDragging_ = function() {
+  this.eventHandler_.removeAll();
+  if (goog.fx.Dragger.HAS_SET_CAPTURE_) {
+    this.document_.releaseCapture();
+  }
+};
+
+
+/**
+ * Event handler that is used to end the drag.
+ * @param {goog.events.BrowserEvent} e Event object.
+ * @param {boolean=} opt_dragCanceled Whether the drag has been canceled.
+ */
+goog.fx.Dragger.prototype.endDrag = function(e, opt_dragCanceled) {
+  this.cleanUpAfterDragging_();
+
+  if (this.dragging_) {
+    this.dragging_ = false;
+
+    var x = this.limitX(this.deltaX);
+    var y = this.limitY(this.deltaY);
+    var dragCanceled = opt_dragCanceled ||
+        e.type == goog.events.EventType.TOUCHCANCEL;
+    this.dispatchEvent(new goog.fx.DragEvent(
+        goog.fx.Dragger.EventType.END, this, e.clientX, e.clientY, e, x, y,
+        dragCanceled));
+  } else {
+    this.dispatchEvent(goog.fx.Dragger.EventType.EARLY_CANCEL);
+  }
+};
+
+
+/**
+ * Event handler that is used to end the drag by cancelling it.
+ * @param {goog.events.BrowserEvent} e Event object.
+ */
+goog.fx.Dragger.prototype.endDragCancel = function(e) {
+  this.endDrag(e, true);
+};
+
+
+/**
+ * Event handler that is used on mouse / touch move to update the drag
+ * @param {goog.events.BrowserEvent} e Event object.
+ * @private
+ */
+goog.fx.Dragger.prototype.handleMove_ = function(e) {
+  if (this.enabled_) {
+    // dx in right-to-left cases is relative to the right.
+    var sign = this.useRightPositioningForRtl_ &&
+        this.isRightToLeft_() ? -1 : 1;
+    var dx = sign * (e.clientX - this.clientX);
+    var dy = e.clientY - this.clientY;
+    this.clientX = e.clientX;
+    this.clientY = e.clientY;
+    this.screenX = e.screenX;
+    this.screenY = e.screenY;
+
+    if (!this.dragging_) {
+      var diffX = this.startX - this.clientX;
+      var diffY = this.startY - this.clientY;
+      var distance = diffX * diffX + diffY * diffY;
+      if (distance > this.hysteresisDistanceSquared_) {
+        if (this.fireDragStart_(e)) {
+          this.dragging_ = true;
+        } else {
+          // DragListGroup disposes of the dragger if BEFOREDRAGSTART is
+          // canceled.
+          if (!this.isDisposed()) {
+            this.endDrag(e);
+          }
+          return;
+        }
+      }
+    }
+
+    var pos = this.calculatePosition_(dx, dy);
+    var x = pos.x;
+    var y = pos.y;
+
+    if (this.dragging_) {
+
+      var rv = this.dispatchEvent(new goog.fx.DragEvent(
+          goog.fx.Dragger.EventType.BEFOREDRAG, this, e.clientX, e.clientY,
+          e, x, y));
+
+      // Only do the defaultAction and dispatch drag event if predrag didn't
+      // prevent default
+      if (rv) {
+        this.doDrag(e, x, y, false);
+        e.preventDefault();
+      }
+    }
+  }
+};
+
+
+/**
+ * Calculates the drag position.
+ *
+ * @param {number} dx The horizontal movement delta.
+ * @param {number} dy The vertical movement delta.
+ * @return {!goog.math.Coordinate} The newly calculated drag element position.
+ * @private
+ */
+goog.fx.Dragger.prototype.calculatePosition_ = function(dx, dy) {
+  // Update the position for any change in body scrolling
+  var pageScroll = goog.dom.getDomHelper(this.document_).getDocumentScroll();
+  dx += pageScroll.x - this.pageScroll.x;
+  dy += pageScroll.y - this.pageScroll.y;
+  this.pageScroll = pageScroll;
+
+  this.deltaX += dx;
+  this.deltaY += dy;
+
+  var x = this.limitX(this.deltaX);
+  var y = this.limitY(this.deltaY);
+  return new goog.math.Coordinate(x, y);
+};
+
+
+/**
+ * Event handler for scroll target scrolling.
+ * @param {goog.events.BrowserEvent} e The event.
+ * @private
+ */
+goog.fx.Dragger.prototype.onScroll_ = function(e) {
+  var pos = this.calculatePosition_(0, 0);
+  e.clientX = this.clientX;
+  e.clientY = this.clientY;
+  this.doDrag(e, pos.x, pos.y, true);
+};
+
+
+/**
+ * @param {goog.events.BrowserEvent} e The closure object
+ *     representing the browser event that caused a drag event.
+ * @param {number} x The new horizontal position for the drag element.
+ * @param {number} y The new vertical position for the drag element.
+ * @param {boolean} dragFromScroll Whether dragging was caused by scrolling
+ *     the associated scroll target.
+ * @protected
+ */
+goog.fx.Dragger.prototype.doDrag = function(e, x, y, dragFromScroll) {
+  this.defaultAction(x, y);
+  this.dispatchEvent(new goog.fx.DragEvent(
+      goog.fx.Dragger.EventType.DRAG, this, e.clientX, e.clientY, e, x, y));
+};
+
+
+/**
+ * Returns the 'real' x after limits are applied (allows for some
+ * limits to be undefined).
+ * @param {number} x X-coordinate to limit.
+ * @return {number} The 'real' X-coordinate after limits are applied.
+ */
+goog.fx.Dragger.prototype.limitX = function(x) {
+  var rect = this.limits;
+  var left = !isNaN(rect.left) ? rect.left : null;
+  var width = !isNaN(rect.width) ? rect.width : 0;
+  var maxX = left != null ? left + width : Infinity;
+  var minX = left != null ? left : -Infinity;
+  return Math.min(maxX, Math.max(minX, x));
+};
+
+
+/**
+ * Returns the 'real' y after limits are applied (allows for some
+ * limits to be undefined).
+ * @param {number} y Y-coordinate to limit.
+ * @return {number} The 'real' Y-coordinate after limits are applied.
+ */
+goog.fx.Dragger.prototype.limitY = function(y) {
+  var rect = this.limits;
+  var top = !isNaN(rect.top) ? rect.top : null;
+  var height = !isNaN(rect.height) ? rect.height : 0;
+  var maxY = top != null ? top + height : Infinity;
+  var minY = top != null ? top : -Infinity;
+  return Math.min(maxY, Math.max(minY, y));
+};
+
+
+/**
+ * Overridable function for computing the initial position of the target
+ * before dragging begins.
+ * @protected
+ */
+goog.fx.Dragger.prototype.computeInitialPosition = function() {
+  this.deltaX = this.useRightPositioningForRtl_ ?
+      goog.style.bidi.getOffsetStart(this.target) :
+      /** @type {!HTMLElement} */ (this.target).offsetLeft;
+  this.deltaY = /** @type {!HTMLElement} */ (this.target).offsetTop;
+};
+
+
+/**
+ * Overridable function for handling the default action of the drag behaviour.
+ * Normally this is simply moving the element to x,y though in some cases it
+ * might be used to resize the layer.  This is basically a shortcut to
+ * implementing a default ondrag event handler.
+ * @param {number} x X-coordinate for target element. In right-to-left, x this
+ *     is the number of pixels the target should be moved to from the right.
+ * @param {number} y Y-coordinate for target element.
+ */
+goog.fx.Dragger.prototype.defaultAction = function(x, y) {
+  if (this.useRightPositioningForRtl_ && this.isRightToLeft_()) {
+    this.target.style.right = x + 'px';
+  } else {
+    this.target.style.left = x + 'px';
+  }
+  this.target.style.top = y + 'px';
+};
+
+
+/**
+ * @return {boolean} Whether the dragger is currently in the midst of a drag.
+ */
+goog.fx.Dragger.prototype.isDragging = function() {
+  return this.dragging_;
+};
+
+
+
+/**
+ * Object representing a drag event
+ * @param {string} type Event type.
+ * @param {goog.fx.Dragger} dragobj Drag object initiating event.
+ * @param {number} clientX X-coordinate relative to the viewport.
+ * @param {number} clientY Y-coordinate relative to the viewport.
+ * @param {goog.events.BrowserEvent} browserEvent The closure object
+ *   representing the browser event that caused this drag event.
+ * @param {number=} opt_actX Optional actual x for drag if it has been limited.
+ * @param {number=} opt_actY Optional actual y for drag if it has been limited.
+ * @param {boolean=} opt_dragCanceled Whether the drag has been canceled.
+ * @constructor
+ * @struct
+ * @extends {goog.events.Event}
+ */
+goog.fx.DragEvent = function(type, dragobj, clientX, clientY, browserEvent,
+                             opt_actX, opt_actY, opt_dragCanceled) {
+  goog.events.Event.call(this, type);
+
+  /**
+   * X-coordinate relative to the viewport
+   * @type {number}
+   */
+  this.clientX = clientX;
+
+  /**
+   * Y-coordinate relative to the viewport
+   * @type {number}
+   */
+  this.clientY = clientY;
+
+  /**
+   * The closure object representing the browser event that caused this drag
+   * event.
+   * @type {goog.events.BrowserEvent}
+   */
+  this.browserEvent = browserEvent;
+
+  /**
+   * The real x-position of the drag if it has been limited
+   * @type {number}
+   */
+  this.left = goog.isDef(opt_actX) ? opt_actX : dragobj.deltaX;
+
+  /**
+   * The real y-position of the drag if it has been limited
+   * @type {number}
+   */
+  this.top = goog.isDef(opt_actY) ? opt_actY : dragobj.deltaY;
+
+  /**
+   * Reference to the drag object for this event
+   * @type {goog.fx.Dragger}
+   */
+  this.dragger = dragobj;
+
+  /**
+   * Whether drag was canceled with this event. Used to differentiate between
+   * a legitimate drag END that can result in an action and a drag END which is
+   * a result of a drag cancelation. For now it can happen 1) with drag END
+   * event on FireFox when user drags the mouse out of the window, 2) with
+   * drag END event on IE7 which is generated on MOUSEMOVE event when user
+   * moves the mouse into the document after the mouse button has been
+   * released, 3) when TOUCHCANCEL is raised instead of TOUCHEND (on touch
+   * events).
+   * @type {boolean}
+   */
+  this.dragCanceled = !!opt_dragCanceled;
+};
+goog.inherits(goog.fx.DragEvent, goog.events.Event);
+
+// FIXME should possibly show tooltip when dragging?
+
+goog.provide('ol.control.ZoomSlider');
+
+goog.require('goog.asserts');
+goog.require('goog.dom');
+goog.require('goog.events');
+goog.require('goog.events.Event');
+goog.require('goog.events.EventType');
+goog.require('goog.fx.DragEvent');
+goog.require('goog.fx.Dragger');
+goog.require('goog.fx.Dragger.EventType');
+goog.require('goog.math.Rect');
+goog.require('goog.style');
+goog.require('ol.Size');
+goog.require('ol.ViewHint');
+goog.require('ol.animation');
+goog.require('ol.control.Control');
+goog.require('ol.css');
+goog.require('ol.easing');
+goog.require('ol.math');
+
+
+
+/**
+ * @classdesc
+ * A slider type of control for zooming.
+ *
+ * Example:
+ *
+ *     map.addControl(new ol.control.ZoomSlider());
+ *
+ * @constructor
+ * @extends {ol.control.Control}
+ * @param {olx.control.ZoomSliderOptions=} opt_options Zoom slider options.
+ * @api stable
+ */
+ol.control.ZoomSlider = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  /**
+   * Will hold the current resolution of the view.
+   *
+   * @type {number|undefined}
+   * @private
+   */
+  this.currentResolution_ = undefined;
+
+  /**
+   * The direction of the slider. Will be determined from actual display of the
+   * container and defaults to ol.control.ZoomSlider.direction.VERTICAL.
+   *
+   * @type {ol.control.ZoomSlider.direction}
+   * @private
+   */
+  this.direction_ = ol.control.ZoomSlider.direction.VERTICAL;
+
+  /**
+   * The calculated thumb size (border box plus margins).  Set when initSlider_
+   * is called.
+   * @type {ol.Size}
+   * @private
+   */
+  this.thumbSize_ = null;
+
+  /**
+   * Whether the slider is initialized.
+   * @type {boolean}
+   * @private
+   */
+  this.sliderInitialized_ = false;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.duration_ = options.duration !== undefined ? options.duration : 200;
+
+  var className = options.className ? options.className : 'ol-zoomslider';
+  var thumbElement = goog.dom.createDom('BUTTON', {
+    'type': 'button',
+    'class': className + '-thumb ' + ol.css.CLASS_UNSELECTABLE
+  });
+  var containerElement = goog.dom.createDom('DIV',
+      [className, ol.css.CLASS_UNSELECTABLE, ol.css.CLASS_CONTROL],
+      thumbElement);
+
+  /**
+   * @type {goog.fx.Dragger}
+   * @private
+   */
+  this.dragger_ = new goog.fx.Dragger(thumbElement);
+  this.registerDisposable(this.dragger_);
+
+  goog.events.listen(this.dragger_, goog.fx.Dragger.EventType.START,
+      this.handleDraggerStart_, false, this);
+  goog.events.listen(this.dragger_, goog.fx.Dragger.EventType.DRAG,
+      this.handleDraggerDrag_, false, this);
+  goog.events.listen(this.dragger_, goog.fx.Dragger.EventType.END,
+      this.handleDraggerEnd_, false, this);
+
+  goog.events.listen(containerElement, goog.events.EventType.CLICK,
+      this.handleContainerClick_, false, this);
+  goog.events.listen(thumbElement, goog.events.EventType.CLICK,
+      goog.events.Event.stopPropagation);
+
+  var render = options.render ? options.render : ol.control.ZoomSlider.render;
+
+  goog.base(this, {
+    element: containerElement,
+    render: render
+  });
+};
+goog.inherits(ol.control.ZoomSlider, ol.control.Control);
+
+
+/**
+ * The enum for available directions.
+ *
+ * @enum {number}
+ */
+ol.control.ZoomSlider.direction = {
+  VERTICAL: 0,
+  HORIZONTAL: 1
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.control.ZoomSlider.prototype.setMap = function(map) {
+  goog.base(this, 'setMap', map);
+  if (map) {
+    map.render();
+  }
+};
+
+
+/**
+ * Initializes the slider element. This will determine and set this controls
+ * direction_ and also constrain the dragging of the thumb to always be within
+ * the bounds of the container.
+ *
+ * @private
+ */
+ol.control.ZoomSlider.prototype.initSlider_ = function() {
+  var container = this.element;
+  var containerSize = goog.style.getSize(container);
+
+  var thumb = goog.dom.getFirstElementChild(container);
+  var thumbMargins = goog.style.getMarginBox(thumb);
+  var thumbBorderBoxSize = goog.style.getBorderBoxSize(thumb);
+  var thumbWidth = thumbBorderBoxSize.width +
+      thumbMargins.right + thumbMargins.left;
+  var thumbHeight = thumbBorderBoxSize.height +
+      thumbMargins.top + thumbMargins.bottom;
+  this.thumbSize_ = [thumbWidth, thumbHeight];
+
+  var width = containerSize.width - thumbWidth;
+  var height = containerSize.height - thumbHeight;
+
+  var limits;
+  if (containerSize.width > containerSize.height) {
+    this.direction_ = ol.control.ZoomSlider.direction.HORIZONTAL;
+    limits = new goog.math.Rect(0, 0, width, 0);
+  } else {
+    this.direction_ = ol.control.ZoomSlider.direction.VERTICAL;
+    limits = new goog.math.Rect(0, 0, 0, height);
+  }
+  this.dragger_.setLimits(limits);
+  this.sliderInitialized_ = true;
+};
+
+
+/**
+ * Update the zoomslider element.
+ * @param {ol.MapEvent} mapEvent Map event.
+ * @this {ol.control.ZoomSlider}
+ * @api
+ */
+ol.control.ZoomSlider.render = function(mapEvent) {
+  if (!mapEvent.frameState) {
+    return;
+  }
+  goog.asserts.assert(mapEvent.frameState.viewState,
+      'viewState should be defined');
+  if (!this.sliderInitialized_) {
+    this.initSlider_();
+  }
+  var res = mapEvent.frameState.viewState.resolution;
+  if (res !== this.currentResolution_) {
+    this.currentResolution_ = res;
+    this.setThumbPosition_(res);
+  }
+};
+
+
+/**
+ * @param {goog.events.BrowserEvent} browserEvent The browser event to handle.
+ * @private
+ */
+ol.control.ZoomSlider.prototype.handleContainerClick_ = function(browserEvent) {
+  var map = this.getMap();
+  var view = map.getView();
+  var currentResolution = view.getResolution();
+  goog.asserts.assert(currentResolution,
+      'currentResolution should be defined');
+  map.beforeRender(ol.animation.zoom({
+    resolution: currentResolution,
+    duration: this.duration_,
+    easing: ol.easing.easeOut
+  }));
+  var relativePosition = this.getRelativePosition_(
+      browserEvent.offsetX - this.thumbSize_[0] / 2,
+      browserEvent.offsetY - this.thumbSize_[1] / 2);
+  var resolution = this.getResolutionForPosition_(relativePosition);
+  view.setResolution(view.constrainResolution(resolution));
+};
+
+
+/**
+ * Handle dragger start events.
+ * @param {goog.fx.DragEvent} event The drag event.
+ * @private
+ */
+ol.control.ZoomSlider.prototype.handleDraggerStart_ = function(event) {
+  this.getMap().getView().setHint(ol.ViewHint.INTERACTING, 1);
+};
+
+
+/**
+ * Handle dragger drag events.
+ *
+ * @param {goog.fx.DragEvent} event The drag event.
+ * @private
+ */
+ol.control.ZoomSlider.prototype.handleDraggerDrag_ = function(event) {
+  var relativePosition = this.getRelativePosition_(event.left, event.top);
+  this.currentResolution_ = this.getResolutionForPosition_(relativePosition);
+  this.getMap().getView().setResolution(this.currentResolution_);
+};
+
+
+/**
+ * Handle dragger end events.
+ * @param {goog.fx.DragEvent} event The drag event.
+ * @private
+ */
+ol.control.ZoomSlider.prototype.handleDraggerEnd_ = function(event) {
+  var map = this.getMap();
+  var view = map.getView();
+  view.setHint(ol.ViewHint.INTERACTING, -1);
+  goog.asserts.assert(this.currentResolution_,
+      'this.currentResolution_ should be defined');
+  map.beforeRender(ol.animation.zoom({
+    resolution: this.currentResolution_,
+    duration: this.duration_,
+    easing: ol.easing.easeOut
+  }));
+  var resolution = view.constrainResolution(this.currentResolution_);
+  view.setResolution(resolution);
+};
+
+
+/**
+ * Positions the thumb inside its container according to the given resolution.
+ *
+ * @param {number} res The res.
+ * @private
+ */
+ol.control.ZoomSlider.prototype.setThumbPosition_ = function(res) {
+  var position = this.getPositionForResolution_(res);
+  var dragger = this.dragger_;
+  var thumb = goog.dom.getFirstElementChild(this.element);
+
+  if (this.direction_ == ol.control.ZoomSlider.direction.HORIZONTAL) {
+    var left = dragger.limits.left + dragger.limits.width * position;
+    goog.style.setPosition(thumb, left);
+  } else {
+    var top = dragger.limits.top + dragger.limits.height * position;
+    goog.style.setPosition(thumb, dragger.limits.left, top);
+  }
+};
+
+
+/**
+ * Calculates the relative position of the thumb given x and y offsets.  The
+ * relative position scales from 0 to 1.  The x and y offsets are assumed to be
+ * in pixel units within the dragger limits.
+ *
+ * @param {number} x Pixel position relative to the left of the slider.
+ * @param {number} y Pixel position relative to the top of the slider.
+ * @return {number} The relative position of the thumb.
+ * @private
+ */
+ol.control.ZoomSlider.prototype.getRelativePosition_ = function(x, y) {
+  var draggerLimits = this.dragger_.limits;
+  var amount;
+  if (this.direction_ === ol.control.ZoomSlider.direction.HORIZONTAL) {
+    amount = (x - draggerLimits.left) / draggerLimits.width;
+  } else {
+    amount = (y - draggerLimits.top) / draggerLimits.height;
+  }
+  return ol.math.clamp(amount, 0, 1);
+};
+
+
+/**
+ * Calculates the corresponding resolution of the thumb given its relative
+ * position (where 0 is the minimum and 1 is the maximum).
+ *
+ * @param {number} position The relative position of the thumb.
+ * @return {number} The corresponding resolution.
+ * @private
+ */
+ol.control.ZoomSlider.prototype.getResolutionForPosition_ = function(position) {
+  var fn = this.getMap().getView().getResolutionForValueFunction();
+  return fn(1 - position);
+};
+
+
+/**
+ * Determines the relative position of the slider for the given resolution.  A
+ * relative position of 0 corresponds to the minimum view resolution.  A
+ * relative position of 1 corresponds to the maximum view resolution.
+ *
+ * @param {number} res The resolution.
+ * @return {number} The relative position value (between 0 and 1).
+ * @private
+ */
+ol.control.ZoomSlider.prototype.getPositionForResolution_ = function(res) {
+  var fn = this.getMap().getView().getValueForResolutionFunction();
+  return 1 - fn(res);
+};
+
+goog.provide('ol.control.ZoomToExtent');
+
+goog.require('goog.asserts');
+goog.require('goog.dom');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('ol.control.Control');
+goog.require('ol.css');
+
+
+
+/**
+ * @classdesc
+ * A button control which, when pressed, changes the map view to a specific
+ * extent. To style this control use the css selector `.ol-zoom-extent`.
+ *
+ * @constructor
+ * @extends {ol.control.Control}
+ * @param {olx.control.ZoomToExtentOptions=} opt_options Options.
+ * @api stable
+ */
+ol.control.ZoomToExtent = function(opt_options) {
+  var options = opt_options ? opt_options : {};
+
+  /**
+   * @type {ol.Extent}
+   * @private
+   */
+  this.extent_ = options.extent ? options.extent : null;
+
+  var className = options.className ? options.className :
+      'ol-zoom-extent';
+
+  var label = options.label ? options.label : 'E';
+  var tipLabel = options.tipLabel ?
+      options.tipLabel : 'Fit to extent';
+  var button = goog.dom.createDom('BUTTON', {
+    'type': 'button',
+    'title': tipLabel
+  }, label);
+
+  goog.events.listen(button, goog.events.EventType.CLICK,
+      this.handleClick_, false, this);
+
+  var cssClasses = className + ' ' + ol.css.CLASS_UNSELECTABLE + ' ' +
+      ol.css.CLASS_CONTROL;
+  var element = goog.dom.createDom('DIV', cssClasses, button);
+
+  goog.base(this, {
+    element: element,
+    target: options.target
+  });
+};
+goog.inherits(ol.control.ZoomToExtent, ol.control.Control);
+
+
+/**
+ * @param {goog.events.BrowserEvent} event The event to handle
+ * @private
+ */
+ol.control.ZoomToExtent.prototype.handleClick_ = function(event) {
+  event.preventDefault();
+  this.handleZoomToExtent_();
+};
+
+
+/**
+ * @private
+ */
+ol.control.ZoomToExtent.prototype.handleZoomToExtent_ = function() {
+  var map = this.getMap();
+  var view = map.getView();
+  var extent = !this.extent_ ?
+      view.getProjection().getExtent() : this.extent_;
+  var size = map.getSize();
+  goog.asserts.assert(size, 'size should be defined');
+  view.fit(extent, size);
+};
+
+goog.provide('ol.DeviceOrientation');
+goog.provide('ol.DeviceOrientationProperty');
+
+goog.require('goog.events');
+goog.require('ol');
+goog.require('ol.Object');
+goog.require('ol.has');
+goog.require('ol.math');
+
+
+/**
+ * @enum {string}
+ */
+ol.DeviceOrientationProperty = {
+  ALPHA: 'alpha',
+  BETA: 'beta',
+  GAMMA: 'gamma',
+  HEADING: 'heading',
+  TRACKING: 'tracking'
+};
+
+
+
+/**
+ * @classdesc
+ * The ol.DeviceOrientation class provides access to information from
+ * DeviceOrientation events.  See the [HTML 5 DeviceOrientation Specification](
+ * http://www.w3.org/TR/orientation-event/) for more details.
+ *
+ * Many new computers, and especially mobile phones
+ * and tablets, provide hardware support for device orientation. Web
+ * developers targeting mobile devices will be especially interested in this
+ * class.
+ *
+ * Device orientation data are relative to a common starting point. For mobile
+ * devices, the starting point is to lay your phone face up on a table with the
+ * top of the phone pointing north. This represents the zero state. All
+ * angles are then relative to this state. For computers, it is the same except
+ * the screen is open at 90 degrees.
+ *
+ * Device orientation is reported as three angles - `alpha`, `beta`, and
+ * `gamma` - relative to the starting position along the three planar axes X, Y
+ * and Z. The X axis runs from the left edge to the right edge through the
+ * middle of the device. Similarly, the Y axis runs from the bottom to the top
+ * of the device through the middle. The Z axis runs from the back to the front
+ * through the middle. In the starting position, the X axis points to the
+ * right, the Y axis points away from you and the Z axis points straight up
+ * from the device lying flat.
+ *
+ * The three angles representing the device orientation are relative to the
+ * three axes. `alpha` indicates how much the device has been rotated around the
+ * Z axis, which is commonly interpreted as the compass heading (see note
+ * below). `beta` indicates how much the device has been rotated around the X
+ * axis, or how much it is tilted from front to back.  `gamma` indicates how
+ * much the device has been rotated around the Y axis, or how much it is tilted
+ * from left to right.
+ *
+ * For most browsers, the `alpha` value returns the compass heading so if the
+ * device points north, it will be 0.  With Safari on iOS, the 0 value of
+ * `alpha` is calculated from when device orientation was first requested.
+ * ol.DeviceOrientation provides the `heading` property which normalizes this
+ * behavior across all browsers for you.
+ *
+ * It is important to note that the HTML 5 DeviceOrientation specification
+ * indicates that `alpha`, `beta` and `gamma` are in degrees while the
+ * equivalent properties in ol.DeviceOrientation are in radians for consistency
+ * with all other uses of angles throughout OpenLayers.
+ *
+ * @see http://www.w3.org/TR/orientation-event/
+ *
+ * To get notified of device orientation changes, register a listener for the
+ * generic `change` event on your `ol.DeviceOrientation` instance.
+ *
+ * @constructor
+ * @extends {ol.Object}
+ * @param {olx.DeviceOrientationOptions=} opt_options Options.
+ * @api
+ */
+ol.DeviceOrientation = function(opt_options) {
+
+  goog.base(this);
+
+  var options = opt_options ? opt_options : {};
+
+  /**
+   * @private
+   * @type {goog.events.Key}
+   */
+  this.listenerKey_ = null;
+
+  goog.events.listen(this,
+      ol.Object.getChangeEventType(ol.DeviceOrientationProperty.TRACKING),
+      this.handleTrackingChanged_, false, this);
+
+  this.setTracking(options.tracking !== undefined ? options.tracking : false);
+
+};
+goog.inherits(ol.DeviceOrientation, ol.Object);
+
+
+/**
+ * @inheritDoc
+ */
+ol.DeviceOrientation.prototype.disposeInternal = function() {
+  this.setTracking(false);
+  goog.base(this, 'disposeInternal');
+};
+
+
+/**
+ * @private
+ * @param {goog.events.BrowserEvent} browserEvent Event.
+ */
+ol.DeviceOrientation.prototype.orientationChange_ = function(browserEvent) {
+  var event = /** @type {DeviceOrientationEvent} */
+      (browserEvent.getBrowserEvent());
+  if (event.alpha !== null) {
+    var alpha = ol.math.toRadians(event.alpha);
+    this.set(ol.DeviceOrientationProperty.ALPHA, alpha);
+    // event.absolute is undefined in iOS.
+    if (goog.isBoolean(event.absolute) && event.absolute) {
+      this.set(ol.DeviceOrientationProperty.HEADING, alpha);
+    } else if (goog.isNumber(event.webkitCompassHeading) &&
+               event.webkitCompassAccuracy != -1) {
+      var heading = ol.math.toRadians(event.webkitCompassHeading);
+      this.set(ol.DeviceOrientationProperty.HEADING, heading);
+    }
+  }
+  if (event.beta !== null) {
+    this.set(ol.DeviceOrientationProperty.BETA,
+        ol.math.toRadians(event.beta));
+  }
+  if (event.gamma !== null) {
+    this.set(ol.DeviceOrientationProperty.GAMMA,
+        ol.math.toRadians(event.gamma));
+  }
+  this.changed();
+};
+
+
+/**
+ * Rotation around the device z-axis (in radians).
+ * @return {number|undefined} The euler angle in radians of the device from the
+ *     standard Z axis.
+ * @observable
+ * @api
+ */
+ol.DeviceOrientation.prototype.getAlpha = function() {
+  return /** @type {number|undefined} */ (
+      this.get(ol.DeviceOrientationProperty.ALPHA));
+};
+
+
+/**
+ * Rotation around the device x-axis (in radians).
+ * @return {number|undefined} The euler angle in radians of the device from the
+ *     planar X axis.
+ * @observable
+ * @api
+ */
+ol.DeviceOrientation.prototype.getBeta = function() {
+  return /** @type {number|undefined} */ (
+      this.get(ol.DeviceOrientationProperty.BETA));
+};
+
+
+/**
+ * Rotation around the device y-axis (in radians).
+ * @return {number|undefined} The euler angle in radians of the device from the
+ *     planar Y axis.
+ * @observable
+ * @api
+ */
+ol.DeviceOrientation.prototype.getGamma = function() {
+  return /** @type {number|undefined} */ (
+      this.get(ol.DeviceOrientationProperty.GAMMA));
+};
+
+
+/**
+ * The heading of the device relative to north (in radians).
+ * @return {number|undefined} The heading of the device relative to north, in
+ *     radians, normalizing for different browser behavior.
+ * @observable
+ * @api
+ */
+ol.DeviceOrientation.prototype.getHeading = function() {
+  return /** @type {number|undefined} */ (
+      this.get(ol.DeviceOrientationProperty.HEADING));
+};
+
+
+/**
+ * Determine if orientation is being tracked.
+ * @return {boolean} Changes in device orientation are being tracked.
+ * @observable
+ * @api
+ */
+ol.DeviceOrientation.prototype.getTracking = function() {
+  return /** @type {boolean} */ (
+      this.get(ol.DeviceOrientationProperty.TRACKING));
+};
+
+
+/**
+ * @private
+ */
+ol.DeviceOrientation.prototype.handleTrackingChanged_ = function() {
+  if (ol.has.DEVICE_ORIENTATION) {
+    var tracking = this.getTracking();
+    if (tracking && !this.listenerKey_) {
+      this.listenerKey_ = goog.events.listen(goog.global, 'deviceorientation',
+          this.orientationChange_, false, this);
+    } else if (!tracking && this.listenerKey_) {
+      goog.events.unlistenByKey(this.listenerKey_);
+      this.listenerKey_ = null;
+    }
+  }
+};
+
+
+/**
+ * Enable or disable tracking of device orientation events.
+ * @param {boolean} tracking The status of tracking changes to alpha, beta and
+ *     gamma. If true, changes are tracked and reported immediately.
+ * @observable
+ * @api
+ */
+ol.DeviceOrientation.prototype.setTracking = function(tracking) {
+  this.set(ol.DeviceOrientationProperty.TRACKING, tracking);
+};
+
+goog.provide('ol.format.Feature');
+
+goog.require('ol.geom.Geometry');
+goog.require('ol.proj');
+
+
+
+/**
+ * @classdesc
+ * Abstract base class; normally only used for creating subclasses and not
+ * instantiated in apps.
+ * Base class for feature formats.
+ * {ol.format.Feature} subclasses provide the ability to decode and encode
+ * {@link ol.Feature} objects from a variety of commonly used geospatial
+ * file formats.  See the documentation for each format for more details.
+ *
+ * @constructor
+ * @api stable
+ */
+ol.format.Feature = function() {
+
+  /**
+   * @protected
+   * @type {ol.proj.Projection}
+   */
+  this.defaultDataProjection = null;
+
+};
+
+
+/**
+ * @return {Array.<string>} Extensions.
+ */
+ol.format.Feature.prototype.getExtensions = goog.abstractMethod;
+
+
+/**
+ * Adds the data projection to the read options.
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Options.
+ * @return {olx.format.ReadOptions|undefined} Options.
+ * @protected
+ */
+ol.format.Feature.prototype.getReadOptions = function(source, opt_options) {
+  var options;
+  if (opt_options) {
+    options = {
+      dataProjection: opt_options.dataProjection ?
+          opt_options.dataProjection : this.readProjection(source),
+      featureProjection: opt_options.featureProjection
+    };
+  }
+  return this.adaptOptions(options);
+};
+
+
+/**
+ * Sets the `defaultDataProjection` on the options, if no `dataProjection`
+ * is set.
+ * @param {olx.format.WriteOptions|olx.format.ReadOptions|undefined} options
+ *     Options.
+ * @protected
+ * @return {olx.format.WriteOptions|olx.format.ReadOptions|undefined}
+ *     Updated options.
+ */
+ol.format.Feature.prototype.adaptOptions = function(options) {
+  var updatedOptions;
+  if (options) {
+    updatedOptions = {
+      featureProjection: options.featureProjection,
+      dataProjection: options.dataProjection ?
+          options.dataProjection : this.defaultDataProjection,
+      rightHanded: options.rightHanded
+    };
+  }
+  return updatedOptions;
+};
+
+
+/**
+ * @return {ol.format.FormatType} Format.
+ */
+ol.format.Feature.prototype.getType = goog.abstractMethod;
+
+
+/**
+ * Read a single feature from a source.
+ *
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {ol.Feature} Feature.
+ */
+ol.format.Feature.prototype.readFeature = goog.abstractMethod;
+
+
+/**
+ * Read all features from a source.
+ *
+ * @param {Document|Node|ArrayBuffer|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {Array.<ol.Feature>} Features.
+ */
+ol.format.Feature.prototype.readFeatures = goog.abstractMethod;
+
+
+/**
+ * Read a single geometry from a source.
+ *
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {ol.geom.Geometry} Geometry.
+ */
+ol.format.Feature.prototype.readGeometry = goog.abstractMethod;
+
+
+/**
+ * Read the projection from a source.
+ *
+ * @param {Document|Node|Object|string} source Source.
+ * @return {ol.proj.Projection} Projection.
+ */
+ol.format.Feature.prototype.readProjection = goog.abstractMethod;
+
+
+/**
+ * Encode a feature in this format.
+ *
+ * @param {ol.Feature} feature Feature.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {string} Result.
+ */
+ol.format.Feature.prototype.writeFeature = goog.abstractMethod;
+
+
+/**
+ * Encode an array of features in this format.
+ *
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {string} Result.
+ */
+ol.format.Feature.prototype.writeFeatures = goog.abstractMethod;
+
+
+/**
+ * Write a single geometry in this format.
+ *
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {string} Result.
+ */
+ol.format.Feature.prototype.writeGeometry = goog.abstractMethod;
+
+
+/**
+ * @param {ol.geom.Geometry|ol.Extent} geometry Geometry.
+ * @param {boolean} write Set to true for writing, false for reading.
+ * @param {(olx.format.WriteOptions|olx.format.ReadOptions)=} opt_options
+ *     Options.
+ * @return {ol.geom.Geometry|ol.Extent} Transformed geometry.
+ * @protected
+ */
+ol.format.Feature.transformWithOptions = function(
+    geometry, write, opt_options) {
+  var featureProjection = opt_options ?
+      ol.proj.get(opt_options.featureProjection) : null;
+  var dataProjection = opt_options ?
+      ol.proj.get(opt_options.dataProjection) : null;
+  if (featureProjection && dataProjection &&
+      !ol.proj.equivalent(featureProjection, dataProjection)) {
+    if (geometry instanceof ol.geom.Geometry) {
+      return (write ? geometry.clone() : geometry).transform(
+          write ? featureProjection : dataProjection,
+          write ? dataProjection : featureProjection);
+    } else {
+      // FIXME this is necessary because ol.format.GML treats extents
+      // as geometries
+      return ol.proj.transformExtent(
+          write ? geometry.slice() : geometry,
+          write ? featureProjection : dataProjection,
+          write ? dataProjection : featureProjection);
+    }
+  } else {
+    return geometry;
+  }
+};
+
+goog.provide('ol.format.JSONFeature');
+
+goog.require('goog.asserts');
+goog.require('goog.json');
+goog.require('ol.format.Feature');
+goog.require('ol.format.FormatType');
+
+
+
+/**
+ * @classdesc
+ * Abstract base class; normally only used for creating subclasses and not
+ * instantiated in apps.
+ * Base class for JSON feature formats.
+ *
+ * @constructor
+ * @extends {ol.format.Feature}
+ */
+ol.format.JSONFeature = function() {
+  goog.base(this);
+};
+goog.inherits(ol.format.JSONFeature, ol.format.Feature);
+
+
+/**
+ * @param {Document|Node|Object|string} source Source.
+ * @private
+ * @return {Object} Object.
+ */
+ol.format.JSONFeature.prototype.getObject_ = function(source) {
+  if (goog.isObject(source)) {
+    return source;
+  } else if (goog.isString(source)) {
+    var object = goog.json.parse(source);
+    return object ? object : null;
+  } else {
+    goog.asserts.fail();
+    return null;
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.JSONFeature.prototype.getType = function() {
+  return ol.format.FormatType.JSON;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.JSONFeature.prototype.readFeature = function(source, opt_options) {
+  return this.readFeatureFromObject(
+      this.getObject_(source), this.getReadOptions(source, opt_options));
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.JSONFeature.prototype.readFeatures = function(source, opt_options) {
+  return this.readFeaturesFromObject(
+      this.getObject_(source), this.getReadOptions(source, opt_options));
+};
+
+
+/**
+ * @param {Object} object Object.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @protected
+ * @return {ol.Feature} Feature.
+ */
+ol.format.JSONFeature.prototype.readFeatureFromObject = goog.abstractMethod;
+
+
+/**
+ * @param {Object} object Object.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @protected
+ * @return {Array.<ol.Feature>} Features.
+ */
+ol.format.JSONFeature.prototype.readFeaturesFromObject = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.JSONFeature.prototype.readGeometry = function(source, opt_options) {
+  return this.readGeometryFromObject(
+      this.getObject_(source), this.getReadOptions(source, opt_options));
+};
+
+
+/**
+ * @param {Object} object Object.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @protected
+ * @return {ol.geom.Geometry} Geometry.
+ */
+ol.format.JSONFeature.prototype.readGeometryFromObject = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.JSONFeature.prototype.readProjection = function(source) {
+  return this.readProjectionFromObject(this.getObject_(source));
+};
+
+
+/**
+ * @param {Object} object Object.
+ * @protected
+ * @return {ol.proj.Projection} Projection.
+ */
+ol.format.JSONFeature.prototype.readProjectionFromObject = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.JSONFeature.prototype.writeFeature = function(feature, opt_options) {
+  return goog.json.serialize(this.writeFeatureObject(feature, opt_options));
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {Object} Object.
+ */
+ol.format.JSONFeature.prototype.writeFeatureObject = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.JSONFeature.prototype.writeFeatures = function(
+    features, opt_options) {
+  return goog.json.serialize(this.writeFeaturesObject(features, opt_options));
+};
+
+
+/**
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {Object} Object.
+ */
+ol.format.JSONFeature.prototype.writeFeaturesObject = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.JSONFeature.prototype.writeGeometry = function(
+    geometry, opt_options) {
+  return goog.json.serialize(this.writeGeometryObject(geometry, opt_options));
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {Object} Object.
+ */
+ol.format.JSONFeature.prototype.writeGeometryObject = goog.abstractMethod;
+
+goog.provide('ol.geom.flat.interpolate');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.math');
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {number} fraction Fraction.
+ * @param {Array.<number>=} opt_dest Destination.
+ * @return {Array.<number>} Destination.
+ */
+ol.geom.flat.interpolate.lineString =
+    function(flatCoordinates, offset, end, stride, fraction, opt_dest) {
+  // FIXME interpolate extra dimensions
+  goog.asserts.assert(0 <= fraction && fraction <= 1,
+      'fraction should be in between 0 and 1');
+  var pointX = NaN;
+  var pointY = NaN;
+  var n = (end - offset) / stride;
+  if (n === 0) {
+    goog.asserts.fail('n cannot be 0');
+  } else if (n == 1) {
+    pointX = flatCoordinates[offset];
+    pointY = flatCoordinates[offset + 1];
+  } else if (n == 2) {
+    pointX = (1 - fraction) * flatCoordinates[offset] +
+        fraction * flatCoordinates[offset + stride];
+    pointY = (1 - fraction) * flatCoordinates[offset + 1] +
+        fraction * flatCoordinates[offset + stride + 1];
+  } else {
+    var x1 = flatCoordinates[offset];
+    var y1 = flatCoordinates[offset + 1];
+    var length = 0;
+    var cumulativeLengths = [0];
+    var i;
+    for (i = offset + stride; i < end; i += stride) {
+      var x2 = flatCoordinates[i];
+      var y2 = flatCoordinates[i + 1];
+      length += Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
+      cumulativeLengths.push(length);
+      x1 = x2;
+      y1 = y2;
+    }
+    var target = fraction * length;
+    var index = goog.array.binarySearch(cumulativeLengths, target);
+    if (index < 0) {
+      var t = (target - cumulativeLengths[-index - 2]) /
+          (cumulativeLengths[-index - 1] - cumulativeLengths[-index - 2]);
+      var o = offset + (-index - 2) * stride;
+      pointX = goog.math.lerp(
+          flatCoordinates[o], flatCoordinates[o + stride], t);
+      pointY = goog.math.lerp(
+          flatCoordinates[o + 1], flatCoordinates[o + stride + 1], t);
+    } else {
+      pointX = flatCoordinates[offset + index * stride];
+      pointY = flatCoordinates[offset + index * stride + 1];
+    }
+  }
+  if (opt_dest) {
+    opt_dest[0] = pointX;
+    opt_dest[1] = pointY;
+    return opt_dest;
+  } else {
+    return [pointX, pointY];
+  }
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {number} m M.
+ * @param {boolean} extrapolate Extrapolate.
+ * @return {ol.Coordinate} Coordinate.
+ */
+ol.geom.flat.lineStringCoordinateAtM =
+    function(flatCoordinates, offset, end, stride, m, extrapolate) {
+  if (end == offset) {
+    return null;
+  }
+  var coordinate;
+  if (m < flatCoordinates[offset + stride - 1]) {
+    if (extrapolate) {
+      coordinate = flatCoordinates.slice(offset, offset + stride);
+      coordinate[stride - 1] = m;
+      return coordinate;
+    } else {
+      return null;
+    }
+  } else if (flatCoordinates[end - 1] < m) {
+    if (extrapolate) {
+      coordinate = flatCoordinates.slice(end - stride, end);
+      coordinate[stride - 1] = m;
+      return coordinate;
+    } else {
+      return null;
+    }
+  }
+  // FIXME use O(1) search
+  if (m == flatCoordinates[offset + stride - 1]) {
+    return flatCoordinates.slice(offset, offset + stride);
+  }
+  var lo = offset / stride;
+  var hi = end / stride;
+  while (lo < hi) {
+    var mid = (lo + hi) >> 1;
+    if (m < flatCoordinates[(mid + 1) * stride - 1]) {
+      hi = mid;
+    } else {
+      lo = mid + 1;
+    }
+  }
+  var m0 = flatCoordinates[lo * stride - 1];
+  if (m == m0) {
+    return flatCoordinates.slice((lo - 1) * stride, (lo - 1) * stride + stride);
+  }
+  var m1 = flatCoordinates[(lo + 1) * stride - 1];
+  goog.asserts.assert(m0 < m, 'm0 should be less than m');
+  goog.asserts.assert(m <= m1, 'm should be less than or equal to m1');
+  var t = (m - m0) / (m1 - m0);
+  coordinate = [];
+  var i;
+  for (i = 0; i < stride - 1; ++i) {
+    coordinate.push(goog.math.lerp(flatCoordinates[(lo - 1) * stride + i],
+        flatCoordinates[lo * stride + i], t));
+  }
+  coordinate.push(m);
+  goog.asserts.assert(coordinate.length == stride,
+      'length of coordinate array should match stride');
+  return coordinate;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<number>} ends Ends.
+ * @param {number} stride Stride.
+ * @param {number} m M.
+ * @param {boolean} extrapolate Extrapolate.
+ * @param {boolean} interpolate Interpolate.
+ * @return {ol.Coordinate} Coordinate.
+ */
+ol.geom.flat.lineStringsCoordinateAtM = function(
+    flatCoordinates, offset, ends, stride, m, extrapolate, interpolate) {
+  if (interpolate) {
+    return ol.geom.flat.lineStringCoordinateAtM(
+        flatCoordinates, offset, ends[ends.length - 1], stride, m, extrapolate);
+  }
+  var coordinate;
+  if (m < flatCoordinates[stride - 1]) {
+    if (extrapolate) {
+      coordinate = flatCoordinates.slice(0, stride);
+      coordinate[stride - 1] = m;
+      return coordinate;
+    } else {
+      return null;
+    }
+  }
+  if (flatCoordinates[flatCoordinates.length - 1] < m) {
+    if (extrapolate) {
+      coordinate = flatCoordinates.slice(flatCoordinates.length - stride);
+      coordinate[stride - 1] = m;
+      return coordinate;
+    } else {
+      return null;
+    }
+  }
+  var i, ii;
+  for (i = 0, ii = ends.length; i < ii; ++i) {
+    var end = ends[i];
+    if (offset == end) {
+      continue;
+    }
+    if (m < flatCoordinates[offset + stride - 1]) {
+      return null;
+    } else if (m <= flatCoordinates[end - 1]) {
+      return ol.geom.flat.lineStringCoordinateAtM(
+          flatCoordinates, offset, end, stride, m, false);
+    }
+    offset = end;
+  }
+  goog.asserts.fail(
+      'ol.geom.flat.lineStringsCoordinateAtM should have returned');
+  return null;
+};
+
+goog.provide('ol.geom.flat.length');
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @return {number} Length.
+ */
+ol.geom.flat.length.lineString =
+    function(flatCoordinates, offset, end, stride) {
+  var x1 = flatCoordinates[offset];
+  var y1 = flatCoordinates[offset + 1];
+  var length = 0;
+  var i;
+  for (i = offset + stride; i < end; i += stride) {
+    var x2 = flatCoordinates[i];
+    var y2 = flatCoordinates[i + 1];
+    length += Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
+    x1 = x2;
+    y1 = y2;
+  }
+  return length;
+};
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @return {number} Perimeter.
+ */
+ol.geom.flat.length.linearRing =
+    function(flatCoordinates, offset, end, stride) {
+  var perimeter =
+      ol.geom.flat.length.lineString(flatCoordinates, offset, end, stride);
+  var dx = flatCoordinates[end - stride] - flatCoordinates[offset];
+  var dy = flatCoordinates[end - stride + 1] - flatCoordinates[offset + 1];
+  perimeter += Math.sqrt(dx * dx + dy * dy);
+  return perimeter;
+};
+
+goog.provide('ol.geom.LineString');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('ol');
+goog.require('ol.extent');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.GeometryType');
+goog.require('ol.geom.SimpleGeometry');
+goog.require('ol.geom.flat.closest');
+goog.require('ol.geom.flat.deflate');
+goog.require('ol.geom.flat.inflate');
+goog.require('ol.geom.flat.interpolate');
+goog.require('ol.geom.flat.intersectsextent');
+goog.require('ol.geom.flat.length');
+goog.require('ol.geom.flat.segments');
+goog.require('ol.geom.flat.simplify');
+
+
+
+/**
+ * @classdesc
+ * Linestring geometry.
+ *
+ * @constructor
+ * @extends {ol.geom.SimpleGeometry}
+ * @param {Array.<ol.Coordinate>} coordinates Coordinates.
+ * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @api stable
+ */
+ol.geom.LineString = function(coordinates, opt_layout) {
+
+  goog.base(this);
+
+  /**
+   * @private
+   * @type {ol.Coordinate}
+   */
+  this.flatMidpoint_ = null;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.flatMidpointRevision_ = -1;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.maxDelta_ = -1;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.maxDeltaRevision_ = -1;
+
+  this.setCoordinates(coordinates, opt_layout);
+
+};
+goog.inherits(ol.geom.LineString, ol.geom.SimpleGeometry);
+
+
+/**
+ * Append the passed coordinate to the coordinates of the linestring.
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @api stable
+ */
+ol.geom.LineString.prototype.appendCoordinate = function(coordinate) {
+  goog.asserts.assert(coordinate.length == this.stride,
+      'length of coordinate array should match stride');
+  if (!this.flatCoordinates) {
+    this.flatCoordinates = coordinate.slice();
+  } else {
+    goog.array.extend(this.flatCoordinates, coordinate);
+  }
+  this.changed();
+};
+
+
+/**
+ * Make a complete copy of the geometry.
+ * @return {!ol.geom.LineString} Clone.
+ * @api stable
+ */
+ol.geom.LineString.prototype.clone = function() {
+  var lineString = new ol.geom.LineString(null);
+  lineString.setFlatCoordinates(this.layout, this.flatCoordinates.slice());
+  return lineString;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.LineString.prototype.closestPointXY =
+    function(x, y, closestPoint, minSquaredDistance) {
+  if (minSquaredDistance <
+      ol.extent.closestSquaredDistanceXY(this.getExtent(), x, y)) {
+    return minSquaredDistance;
+  }
+  if (this.maxDeltaRevision_ != this.getRevision()) {
+    this.maxDelta_ = Math.sqrt(ol.geom.flat.closest.getMaxSquaredDelta(
+        this.flatCoordinates, 0, this.flatCoordinates.length, this.stride, 0));
+    this.maxDeltaRevision_ = this.getRevision();
+  }
+  return ol.geom.flat.closest.getClosestPoint(
+      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
+      this.maxDelta_, false, x, y, closestPoint, minSquaredDistance);
+};
+
+
+/**
+ * Iterate over each segment, calling the provided callback.
+ * If the callback returns a truthy value the function returns that
+ * value immediately. Otherwise the function returns `false`.
+ *
+ * @param {function(this: S, ol.Coordinate, ol.Coordinate): T} callback Function
+ *     called for each segment.
+ * @param {S=} opt_this The object to be used as the value of 'this'
+ *     within callback.
+ * @return {T|boolean} Value.
+ * @template T,S
+ * @api
+ */
+ol.geom.LineString.prototype.forEachSegment = function(callback, opt_this) {
+  return ol.geom.flat.segments.forEach(this.flatCoordinates, 0,
+      this.flatCoordinates.length, this.stride, callback, opt_this);
+};
+
+
+/**
+ * Returns the coordinate at `m` using linear interpolation, or `null` if no
+ * such coordinate exists.
+ *
+ * `opt_extrapolate` controls extrapolation beyond the range of Ms in the
+ * MultiLineString. If `opt_extrapolate` is `true` then Ms less than the first
+ * M will return the first coordinate and Ms greater than the last M will
+ * return the last coordinate.
+ *
+ * @param {number} m M.
+ * @param {boolean=} opt_extrapolate Extrapolate. Default is `false`.
+ * @return {ol.Coordinate} Coordinate.
+ * @api stable
+ */
+ol.geom.LineString.prototype.getCoordinateAtM = function(m, opt_extrapolate) {
+  if (this.layout != ol.geom.GeometryLayout.XYM &&
+      this.layout != ol.geom.GeometryLayout.XYZM) {
+    return null;
+  }
+  var extrapolate = opt_extrapolate !== undefined ? opt_extrapolate : false;
+  return ol.geom.flat.lineStringCoordinateAtM(this.flatCoordinates, 0,
+      this.flatCoordinates.length, this.stride, m, extrapolate);
+};
+
+
+/**
+ * Return the coordinates of the linestring.
+ * @return {Array.<ol.Coordinate>} Coordinates.
+ * @api stable
+ */
+ol.geom.LineString.prototype.getCoordinates = function() {
+  return ol.geom.flat.inflate.coordinates(
+      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);
+};
+
+
+/**
+ * Return the length of the linestring on projected plane.
+ * @return {number} Length (on projected plane).
+ * @api stable
+ */
+ol.geom.LineString.prototype.getLength = function() {
+  return ol.geom.flat.length.lineString(
+      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);
+};
+
+
+/**
+ * @return {Array.<number>} Flat midpoint.
+ */
+ol.geom.LineString.prototype.getFlatMidpoint = function() {
+  if (this.flatMidpointRevision_ != this.getRevision()) {
+    this.flatMidpoint_ = ol.geom.flat.interpolate.lineString(
+        this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
+        0.5, this.flatMidpoint_);
+    this.flatMidpointRevision_ = this.getRevision();
+  }
+  return this.flatMidpoint_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.LineString.prototype.getSimplifiedGeometryInternal =
+    function(squaredTolerance) {
+  var simplifiedFlatCoordinates = [];
+  simplifiedFlatCoordinates.length = ol.geom.flat.simplify.douglasPeucker(
+      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
+      squaredTolerance, simplifiedFlatCoordinates, 0);
+  var simplifiedLineString = new ol.geom.LineString(null);
+  simplifiedLineString.setFlatCoordinates(
+      ol.geom.GeometryLayout.XY, simplifiedFlatCoordinates);
+  return simplifiedLineString;
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.LineString.prototype.getType = function() {
+  return ol.geom.GeometryType.LINE_STRING;
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.LineString.prototype.intersectsExtent = function(extent) {
+  return ol.geom.flat.intersectsextent.lineString(
+      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
+      extent);
+};
+
+
+/**
+ * Set the coordinates of the linestring.
+ * @param {Array.<ol.Coordinate>} coordinates Coordinates.
+ * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @api stable
+ */
+ol.geom.LineString.prototype.setCoordinates =
+    function(coordinates, opt_layout) {
+  if (!coordinates) {
+    this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null);
+  } else {
+    this.setLayout(opt_layout, coordinates, 1);
+    if (!this.flatCoordinates) {
+      this.flatCoordinates = [];
+    }
+    this.flatCoordinates.length = ol.geom.flat.deflate.coordinates(
+        this.flatCoordinates, 0, coordinates, this.stride);
+    this.changed();
+  }
+};
+
+
+/**
+ * @param {ol.geom.GeometryLayout} layout Layout.
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ */
+ol.geom.LineString.prototype.setFlatCoordinates =
+    function(layout, flatCoordinates) {
+  this.setFlatCoordinatesInternal(layout, flatCoordinates);
+  this.changed();
+};
+
+goog.provide('ol.geom.MultiLineString');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('ol');
+goog.require('ol.extent');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.GeometryType');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.SimpleGeometry');
+goog.require('ol.geom.flat.closest');
+goog.require('ol.geom.flat.deflate');
+goog.require('ol.geom.flat.inflate');
+goog.require('ol.geom.flat.interpolate');
+goog.require('ol.geom.flat.intersectsextent');
+goog.require('ol.geom.flat.simplify');
+
+
+
+/**
+ * @classdesc
+ * Multi-linestring geometry.
+ *
+ * @constructor
+ * @extends {ol.geom.SimpleGeometry}
+ * @param {Array.<Array.<ol.Coordinate>>} coordinates Coordinates.
+ * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @api stable
+ */
+ol.geom.MultiLineString = function(coordinates, opt_layout) {
+
+  goog.base(this);
+
+  /**
+   * @type {Array.<number>}
+   * @private
+   */
+  this.ends_ = [];
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.maxDelta_ = -1;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.maxDeltaRevision_ = -1;
+
+  this.setCoordinates(coordinates, opt_layout);
+
+};
+goog.inherits(ol.geom.MultiLineString, ol.geom.SimpleGeometry);
+
+
+/**
+ * Append the passed linestring to the multilinestring.
+ * @param {ol.geom.LineString} lineString LineString.
+ * @api stable
+ */
+ol.geom.MultiLineString.prototype.appendLineString = function(lineString) {
+  goog.asserts.assert(lineString.getLayout() == this.layout,
+      'layout of lineString should match the layout');
+  if (!this.flatCoordinates) {
+    this.flatCoordinates = lineString.getFlatCoordinates().slice();
+  } else {
+    goog.array.extend(
+        this.flatCoordinates, lineString.getFlatCoordinates().slice());
+  }
+  this.ends_.push(this.flatCoordinates.length);
+  this.changed();
+};
+
+
+/**
+ * Make a complete copy of the geometry.
+ * @return {!ol.geom.MultiLineString} Clone.
+ * @api stable
+ */
+ol.geom.MultiLineString.prototype.clone = function() {
+  var multiLineString = new ol.geom.MultiLineString(null);
+  multiLineString.setFlatCoordinates(
+      this.layout, this.flatCoordinates.slice(), this.ends_.slice());
+  return multiLineString;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.MultiLineString.prototype.closestPointXY =
+    function(x, y, closestPoint, minSquaredDistance) {
+  if (minSquaredDistance <
+      ol.extent.closestSquaredDistanceXY(this.getExtent(), x, y)) {
+    return minSquaredDistance;
+  }
+  if (this.maxDeltaRevision_ != this.getRevision()) {
+    this.maxDelta_ = Math.sqrt(ol.geom.flat.closest.getsMaxSquaredDelta(
+        this.flatCoordinates, 0, this.ends_, this.stride, 0));
+    this.maxDeltaRevision_ = this.getRevision();
+  }
+  return ol.geom.flat.closest.getsClosestPoint(
+      this.flatCoordinates, 0, this.ends_, this.stride,
+      this.maxDelta_, false, x, y, closestPoint, minSquaredDistance);
+};
+
+
+/**
+ * Returns the coordinate at `m` using linear interpolation, or `null` if no
+ * such coordinate exists.
+ *
+ * `opt_extrapolate` controls extrapolation beyond the range of Ms in the
+ * MultiLineString. If `opt_extrapolate` is `true` then Ms less than the first
+ * M will return the first coordinate and Ms greater than the last M will
+ * return the last coordinate.
+ *
+ * `opt_interpolate` controls interpolation between consecutive LineStrings
+ * within the MultiLineString. If `opt_interpolate` is `true` the coordinates
+ * will be linearly interpolated between the last coordinate of one LineString
+ * and the first coordinate of the next LineString.  If `opt_interpolate` is
+ * `false` then the function will return `null` for Ms falling between
+ * LineStrings.
+ *
+ * @param {number} m M.
+ * @param {boolean=} opt_extrapolate Extrapolate. Default is `false`.
+ * @param {boolean=} opt_interpolate Interpolate. Default is `false`.
+ * @return {ol.Coordinate} Coordinate.
+ * @api stable
+ */
+ol.geom.MultiLineString.prototype.getCoordinateAtM =
+    function(m, opt_extrapolate, opt_interpolate) {
+  if ((this.layout != ol.geom.GeometryLayout.XYM &&
+       this.layout != ol.geom.GeometryLayout.XYZM) ||
+      this.flatCoordinates.length === 0) {
+    return null;
+  }
+  var extrapolate = opt_extrapolate !== undefined ? opt_extrapolate : false;
+  var interpolate = opt_interpolate !== undefined ? opt_interpolate : false;
+  return ol.geom.flat.lineStringsCoordinateAtM(this.flatCoordinates, 0,
+      this.ends_, this.stride, m, extrapolate, interpolate);
+};
+
+
+/**
+ * Return the coordinates of the multilinestring.
+ * @return {Array.<Array.<ol.Coordinate>>} Coordinates.
+ * @api stable
+ */
+ol.geom.MultiLineString.prototype.getCoordinates = function() {
+  return ol.geom.flat.inflate.coordinatess(
+      this.flatCoordinates, 0, this.ends_, this.stride);
+};
+
+
+/**
+ * @return {Array.<number>} Ends.
+ */
+ol.geom.MultiLineString.prototype.getEnds = function() {
+  return this.ends_;
+};
+
+
+/**
+ * Return the linestring at the specified index.
+ * @param {number} index Index.
+ * @return {ol.geom.LineString} LineString.
+ * @api stable
+ */
+ol.geom.MultiLineString.prototype.getLineString = function(index) {
+  goog.asserts.assert(0 <= index && index < this.ends_.length,
+      'index should be in between 0 and length of the this.ends_ array');
+  if (index < 0 || this.ends_.length <= index) {
+    return null;
+  }
+  var lineString = new ol.geom.LineString(null);
+  lineString.setFlatCoordinates(this.layout, this.flatCoordinates.slice(
+      index === 0 ? 0 : this.ends_[index - 1], this.ends_[index]));
+  return lineString;
+};
+
+
+/**
+ * Return the linestrings of this multilinestring.
+ * @return {Array.<ol.geom.LineString>} LineStrings.
+ * @api stable
+ */
+ol.geom.MultiLineString.prototype.getLineStrings = function() {
+  var flatCoordinates = this.flatCoordinates;
+  var ends = this.ends_;
+  var layout = this.layout;
+  /** @type {Array.<ol.geom.LineString>} */
+  var lineStrings = [];
+  var offset = 0;
+  var i, ii;
+  for (i = 0, ii = ends.length; i < ii; ++i) {
+    var end = ends[i];
+    var lineString = new ol.geom.LineString(null);
+    lineString.setFlatCoordinates(layout, flatCoordinates.slice(offset, end));
+    lineStrings.push(lineString);
+    offset = end;
+  }
+  return lineStrings;
+};
+
+
+/**
+ * @return {Array.<number>} Flat midpoints.
+ */
+ol.geom.MultiLineString.prototype.getFlatMidpoints = function() {
+  var midpoints = [];
+  var flatCoordinates = this.flatCoordinates;
+  var offset = 0;
+  var ends = this.ends_;
+  var stride = this.stride;
+  var i, ii;
+  for (i = 0, ii = ends.length; i < ii; ++i) {
+    var end = ends[i];
+    var midpoint = ol.geom.flat.interpolate.lineString(
+        flatCoordinates, offset, end, stride, 0.5);
+    goog.array.extend(midpoints, midpoint);
+    offset = end;
+  }
+  return midpoints;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.MultiLineString.prototype.getSimplifiedGeometryInternal =
+    function(squaredTolerance) {
+  var simplifiedFlatCoordinates = [];
+  var simplifiedEnds = [];
+  simplifiedFlatCoordinates.length = ol.geom.flat.simplify.douglasPeuckers(
+      this.flatCoordinates, 0, this.ends_, this.stride, squaredTolerance,
+      simplifiedFlatCoordinates, 0, simplifiedEnds);
+  var simplifiedMultiLineString = new ol.geom.MultiLineString(null);
+  simplifiedMultiLineString.setFlatCoordinates(
+      ol.geom.GeometryLayout.XY, simplifiedFlatCoordinates, simplifiedEnds);
+  return simplifiedMultiLineString;
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.MultiLineString.prototype.getType = function() {
+  return ol.geom.GeometryType.MULTI_LINE_STRING;
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.MultiLineString.prototype.intersectsExtent = function(extent) {
+  return ol.geom.flat.intersectsextent.lineStrings(
+      this.flatCoordinates, 0, this.ends_, this.stride, extent);
+};
+
+
+/**
+ * Set the coordinates of the multilinestring.
+ * @param {Array.<Array.<ol.Coordinate>>} coordinates Coordinates.
+ * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @api stable
+ */
+ol.geom.MultiLineString.prototype.setCoordinates =
+    function(coordinates, opt_layout) {
+  if (!coordinates) {
+    this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null, this.ends_);
+  } else {
+    this.setLayout(opt_layout, coordinates, 2);
+    if (!this.flatCoordinates) {
+      this.flatCoordinates = [];
+    }
+    var ends = ol.geom.flat.deflate.coordinatess(
+        this.flatCoordinates, 0, coordinates, this.stride, this.ends_);
+    this.flatCoordinates.length = ends.length === 0 ? 0 : ends[ends.length - 1];
+    this.changed();
+  }
+};
+
+
+/**
+ * @param {ol.geom.GeometryLayout} layout Layout.
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {Array.<number>} ends Ends.
+ */
+ol.geom.MultiLineString.prototype.setFlatCoordinates =
+    function(layout, flatCoordinates, ends) {
+  if (!flatCoordinates) {
+    goog.asserts.assert(ends && ends.length === 0,
+        'ends must be truthy and ends.length should be 0');
+  } else if (ends.length === 0) {
+    goog.asserts.assert(flatCoordinates.length === 0,
+        'flatCoordinates should be an empty array');
+  } else {
+    goog.asserts.assert(flatCoordinates.length == ends[ends.length - 1],
+        'length of flatCoordinates array should match the last value of ends');
+  }
+  this.setFlatCoordinatesInternal(layout, flatCoordinates);
+  this.ends_ = ends;
+  this.changed();
+};
+
+
+/**
+ * @param {Array.<ol.geom.LineString>} lineStrings LineStrings.
+ */
+ol.geom.MultiLineString.prototype.setLineStrings = function(lineStrings) {
+  var layout = this.getLayout();
+  var flatCoordinates = [];
+  var ends = [];
+  var i, ii;
+  for (i = 0, ii = lineStrings.length; i < ii; ++i) {
+    var lineString = lineStrings[i];
+    if (i === 0) {
+      layout = lineString.getLayout();
+    } else {
+      // FIXME better handle the case of non-matching layouts
+      goog.asserts.assert(lineString.getLayout() == layout,
+          'layout of lineString should match layout');
+    }
+    goog.array.extend(flatCoordinates, lineString.getFlatCoordinates());
+    ends.push(flatCoordinates.length);
+  }
+  this.setFlatCoordinates(layout, flatCoordinates, ends);
+};
+
+goog.provide('ol.geom.MultiPoint');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('ol.extent');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.GeometryType');
+goog.require('ol.geom.Point');
+goog.require('ol.geom.SimpleGeometry');
+goog.require('ol.geom.flat.deflate');
+goog.require('ol.geom.flat.inflate');
+goog.require('ol.math');
+
+
+
+/**
+ * @classdesc
+ * Multi-point geometry.
+ *
+ * @constructor
+ * @extends {ol.geom.SimpleGeometry}
+ * @param {Array.<ol.Coordinate>} coordinates Coordinates.
+ * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @api stable
+ */
+ol.geom.MultiPoint = function(coordinates, opt_layout) {
+  goog.base(this);
+  this.setCoordinates(coordinates, opt_layout);
+};
+goog.inherits(ol.geom.MultiPoint, ol.geom.SimpleGeometry);
+
+
+/**
+ * Append the passed point to this multipoint.
+ * @param {ol.geom.Point} point Point.
+ * @api stable
+ */
+ol.geom.MultiPoint.prototype.appendPoint = function(point) {
+  goog.asserts.assert(point.getLayout() == this.layout,
+      'the layout of point should match layout');
+  if (!this.flatCoordinates) {
+    this.flatCoordinates = point.getFlatCoordinates().slice();
+  } else {
+    goog.array.extend(this.flatCoordinates, point.getFlatCoordinates());
+  }
+  this.changed();
+};
+
+
+/**
+ * Make a complete copy of the geometry.
+ * @return {!ol.geom.MultiPoint} Clone.
+ * @api stable
+ */
+ol.geom.MultiPoint.prototype.clone = function() {
+  var multiPoint = new ol.geom.MultiPoint(null);
+  multiPoint.setFlatCoordinates(this.layout, this.flatCoordinates.slice());
+  return multiPoint;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.MultiPoint.prototype.closestPointXY =
+    function(x, y, closestPoint, minSquaredDistance) {
+  if (minSquaredDistance <
+      ol.extent.closestSquaredDistanceXY(this.getExtent(), x, y)) {
+    return minSquaredDistance;
+  }
+  var flatCoordinates = this.flatCoordinates;
+  var stride = this.stride;
+  var i, ii, j;
+  for (i = 0, ii = flatCoordinates.length; i < ii; i += stride) {
+    var squaredDistance = ol.math.squaredDistance(
+        x, y, flatCoordinates[i], flatCoordinates[i + 1]);
+    if (squaredDistance < minSquaredDistance) {
+      minSquaredDistance = squaredDistance;
+      for (j = 0; j < stride; ++j) {
+        closestPoint[j] = flatCoordinates[i + j];
+      }
+      closestPoint.length = stride;
+    }
+  }
+  return minSquaredDistance;
+};
+
+
+/**
+ * Return the coordinates of the multipoint.
+ * @return {Array.<ol.Coordinate>} Coordinates.
+ * @api stable
+ */
+ol.geom.MultiPoint.prototype.getCoordinates = function() {
+  return ol.geom.flat.inflate.coordinates(
+      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);
+};
+
+
+/**
+ * Return the point at the specified index.
+ * @param {number} index Index.
+ * @return {ol.geom.Point} Point.
+ * @api stable
+ */
+ol.geom.MultiPoint.prototype.getPoint = function(index) {
+  var n = !this.flatCoordinates ?
+      0 : this.flatCoordinates.length / this.stride;
+  goog.asserts.assert(0 <= index && index < n,
+      'index should be in between 0 and n');
+  if (index < 0 || n <= index) {
+    return null;
+  }
+  var point = new ol.geom.Point(null);
+  point.setFlatCoordinates(this.layout, this.flatCoordinates.slice(
+      index * this.stride, (index + 1) * this.stride));
+  return point;
+};
+
+
+/**
+ * Return the points of this multipoint.
+ * @return {Array.<ol.geom.Point>} Points.
+ * @api stable
+ */
+ol.geom.MultiPoint.prototype.getPoints = function() {
+  var flatCoordinates = this.flatCoordinates;
+  var layout = this.layout;
+  var stride = this.stride;
+  /** @type {Array.<ol.geom.Point>} */
+  var points = [];
+  var i, ii;
+  for (i = 0, ii = flatCoordinates.length; i < ii; i += stride) {
+    var point = new ol.geom.Point(null);
+    point.setFlatCoordinates(layout, flatCoordinates.slice(i, i + stride));
+    points.push(point);
+  }
+  return points;
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.MultiPoint.prototype.getType = function() {
+  return ol.geom.GeometryType.MULTI_POINT;
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.MultiPoint.prototype.intersectsExtent = function(extent) {
+  var flatCoordinates = this.flatCoordinates;
+  var stride = this.stride;
+  var i, ii, x, y;
+  for (i = 0, ii = flatCoordinates.length; i < ii; i += stride) {
+    x = flatCoordinates[i];
+    y = flatCoordinates[i + 1];
+    if (ol.extent.containsXY(extent, x, y)) {
+      return true;
+    }
+  }
+  return false;
+};
+
+
+/**
+ * Set the coordinates of the multipoint.
+ * @param {Array.<ol.Coordinate>} coordinates Coordinates.
+ * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @api stable
+ */
+ol.geom.MultiPoint.prototype.setCoordinates =
+    function(coordinates, opt_layout) {
+  if (!coordinates) {
+    this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null);
+  } else {
+    this.setLayout(opt_layout, coordinates, 1);
+    if (!this.flatCoordinates) {
+      this.flatCoordinates = [];
+    }
+    this.flatCoordinates.length = ol.geom.flat.deflate.coordinates(
+        this.flatCoordinates, 0, coordinates, this.stride);
+    this.changed();
+  }
+};
+
+
+/**
+ * @param {ol.geom.GeometryLayout} layout Layout.
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ */
+ol.geom.MultiPoint.prototype.setFlatCoordinates =
+    function(layout, flatCoordinates) {
+  this.setFlatCoordinatesInternal(layout, flatCoordinates);
+  this.changed();
+};
+
+goog.provide('ol.geom.flat.center');
+
+goog.require('ol.extent');
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<Array.<number>>} endss Endss.
+ * @param {number} stride Stride.
+ * @return {Array.<number>} Flat centers.
+ */
+ol.geom.flat.center.linearRingss =
+    function(flatCoordinates, offset, endss, stride) {
+  var flatCenters = [];
+  var i, ii;
+  var extent = ol.extent.createEmpty();
+  for (i = 0, ii = endss.length; i < ii; ++i) {
+    var ends = endss[i];
+    extent = ol.extent.createOrUpdateFromFlatCoordinates(
+        flatCoordinates, offset, ends[0], stride);
+    flatCenters.push((extent[0] + extent[2]) / 2, (extent[1] + extent[3]) / 2);
+    offset = ends[ends.length - 1];
+  }
+  return flatCenters;
+};
+
+goog.provide('ol.geom.MultiPolygon');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.extent');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.GeometryType');
+goog.require('ol.geom.MultiPoint');
+goog.require('ol.geom.Polygon');
+goog.require('ol.geom.SimpleGeometry');
+goog.require('ol.geom.flat.area');
+goog.require('ol.geom.flat.center');
+goog.require('ol.geom.flat.closest');
+goog.require('ol.geom.flat.contains');
+goog.require('ol.geom.flat.deflate');
+goog.require('ol.geom.flat.inflate');
+goog.require('ol.geom.flat.interiorpoint');
+goog.require('ol.geom.flat.intersectsextent');
+goog.require('ol.geom.flat.orient');
+goog.require('ol.geom.flat.simplify');
+
+
+
+/**
+ * @classdesc
+ * Multi-polygon geometry.
+ *
+ * @constructor
+ * @extends {ol.geom.SimpleGeometry}
+ * @param {Array.<Array.<Array.<ol.Coordinate>>>} coordinates Coordinates.
+ * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @api stable
+ */
+ol.geom.MultiPolygon = function(coordinates, opt_layout) {
+
+  goog.base(this);
+
+  /**
+   * @type {Array.<Array.<number>>}
+   * @private
+   */
+  this.endss_ = [];
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.flatInteriorPointsRevision_ = -1;
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.flatInteriorPoints_ = null;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.maxDelta_ = -1;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.maxDeltaRevision_ = -1;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.orientedRevision_ = -1;
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.orientedFlatCoordinates_ = null;
+
+  this.setCoordinates(coordinates, opt_layout);
+
+};
+goog.inherits(ol.geom.MultiPolygon, ol.geom.SimpleGeometry);
+
+
+/**
+ * Append the passed polygon to this multipolygon.
+ * @param {ol.geom.Polygon} polygon Polygon.
+ * @api stable
+ */
+ol.geom.MultiPolygon.prototype.appendPolygon = function(polygon) {
+  goog.asserts.assert(polygon.getLayout() == this.layout,
+      'layout of polygon should match layout');
+  /** @type {Array.<number>} */
+  var ends;
+  if (!this.flatCoordinates) {
+    this.flatCoordinates = polygon.getFlatCoordinates().slice();
+    ends = polygon.getEnds().slice();
+    this.endss_.push();
+  } else {
+    var offset = this.flatCoordinates.length;
+    goog.array.extend(this.flatCoordinates, polygon.getFlatCoordinates());
+    ends = polygon.getEnds().slice();
+    var i, ii;
+    for (i = 0, ii = ends.length; i < ii; ++i) {
+      ends[i] += offset;
+    }
+  }
+  this.endss_.push(ends);
+  this.changed();
+};
+
+
+/**
+ * Make a complete copy of the geometry.
+ * @return {!ol.geom.MultiPolygon} Clone.
+ * @api stable
+ */
+ol.geom.MultiPolygon.prototype.clone = function() {
+  var multiPolygon = new ol.geom.MultiPolygon(null);
+  var newEndss = /** @type {Array.<Array.<number>>} */
+      (goog.object.unsafeClone(this.endss_));
+  multiPolygon.setFlatCoordinates(
+      this.layout, this.flatCoordinates.slice(), newEndss);
+  return multiPolygon;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.MultiPolygon.prototype.closestPointXY =
+    function(x, y, closestPoint, minSquaredDistance) {
+  if (minSquaredDistance <
+      ol.extent.closestSquaredDistanceXY(this.getExtent(), x, y)) {
+    return minSquaredDistance;
+  }
+  if (this.maxDeltaRevision_ != this.getRevision()) {
+    this.maxDelta_ = Math.sqrt(ol.geom.flat.closest.getssMaxSquaredDelta(
+        this.flatCoordinates, 0, this.endss_, this.stride, 0));
+    this.maxDeltaRevision_ = this.getRevision();
+  }
+  return ol.geom.flat.closest.getssClosestPoint(
+      this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride,
+      this.maxDelta_, true, x, y, closestPoint, minSquaredDistance);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.MultiPolygon.prototype.containsXY = function(x, y) {
+  return ol.geom.flat.contains.linearRingssContainsXY(
+      this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride, x, y);
+};
+
+
+/**
+ * Return the area of the multipolygon on projected plane.
+ * @return {number} Area (on projected plane).
+ * @api stable
+ */
+ol.geom.MultiPolygon.prototype.getArea = function() {
+  return ol.geom.flat.area.linearRingss(
+      this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride);
+};
+
+
+/**
+ * Get the coordinate array for this geometry.  This array has the structure
+ * of a GeoJSON coordinate array for multi-polygons.
+ *
+ * @param {boolean=} opt_right Orient coordinates according to the right-hand
+ *     rule (counter-clockwise for exterior and clockwise for interior rings).
+ *     If `false`, coordinates will be oriented according to the left-hand rule
+ *     (clockwise for exterior and counter-clockwise for interior rings).
+ *     By default, coordinate orientation will depend on how the geometry was
+ *     constructed.
+ * @return {Array.<Array.<Array.<ol.Coordinate>>>} Coordinates.
+ * @api stable
+ */
+ol.geom.MultiPolygon.prototype.getCoordinates = function(opt_right) {
+  var flatCoordinates;
+  if (opt_right !== undefined) {
+    flatCoordinates = this.getOrientedFlatCoordinates().slice();
+    ol.geom.flat.orient.orientLinearRingss(
+        flatCoordinates, 0, this.endss_, this.stride, opt_right);
+  } else {
+    flatCoordinates = this.flatCoordinates;
+  }
+
+  return ol.geom.flat.inflate.coordinatesss(
+      flatCoordinates, 0, this.endss_, this.stride);
+};
+
+
+/**
+ * @return {Array.<Array.<number>>} Endss.
+ */
+ol.geom.MultiPolygon.prototype.getEndss = function() {
+  return this.endss_;
+};
+
+
+/**
+ * @return {Array.<number>} Flat interior points.
+ */
+ol.geom.MultiPolygon.prototype.getFlatInteriorPoints = function() {
+  if (this.flatInteriorPointsRevision_ != this.getRevision()) {
+    var flatCenters = ol.geom.flat.center.linearRingss(
+        this.flatCoordinates, 0, this.endss_, this.stride);
+    this.flatInteriorPoints_ = ol.geom.flat.interiorpoint.linearRingss(
+        this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride,
+        flatCenters);
+    this.flatInteriorPointsRevision_ = this.getRevision();
+  }
+  return this.flatInteriorPoints_;
+};
+
+
+/**
+ * Return the interior points as {@link ol.geom.MultiPoint multipoint}.
+ * @return {ol.geom.MultiPoint} Interior points.
+ * @api stable
+ */
+ol.geom.MultiPolygon.prototype.getInteriorPoints = function() {
+  var interiorPoints = new ol.geom.MultiPoint(null);
+  interiorPoints.setFlatCoordinates(ol.geom.GeometryLayout.XY,
+      this.getFlatInteriorPoints().slice());
+  return interiorPoints;
+};
+
+
+/**
+ * @return {Array.<number>} Oriented flat coordinates.
+ */
+ol.geom.MultiPolygon.prototype.getOrientedFlatCoordinates = function() {
+  if (this.orientedRevision_ != this.getRevision()) {
+    var flatCoordinates = this.flatCoordinates;
+    if (ol.geom.flat.orient.linearRingssAreOriented(
+        flatCoordinates, 0, this.endss_, this.stride)) {
+      this.orientedFlatCoordinates_ = flatCoordinates;
+    } else {
+      this.orientedFlatCoordinates_ = flatCoordinates.slice();
+      this.orientedFlatCoordinates_.length =
+          ol.geom.flat.orient.orientLinearRingss(
+              this.orientedFlatCoordinates_, 0, this.endss_, this.stride);
+    }
+    this.orientedRevision_ = this.getRevision();
+  }
+  return this.orientedFlatCoordinates_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.MultiPolygon.prototype.getSimplifiedGeometryInternal =
+    function(squaredTolerance) {
+  var simplifiedFlatCoordinates = [];
+  var simplifiedEndss = [];
+  simplifiedFlatCoordinates.length = ol.geom.flat.simplify.quantizess(
+      this.flatCoordinates, 0, this.endss_, this.stride,
+      Math.sqrt(squaredTolerance),
+      simplifiedFlatCoordinates, 0, simplifiedEndss);
+  var simplifiedMultiPolygon = new ol.geom.MultiPolygon(null);
+  simplifiedMultiPolygon.setFlatCoordinates(
+      ol.geom.GeometryLayout.XY, simplifiedFlatCoordinates, simplifiedEndss);
+  return simplifiedMultiPolygon;
+};
+
+
+/**
+ * Return the polygon at the specified index.
+ * @param {number} index Index.
+ * @return {ol.geom.Polygon} Polygon.
+ * @api stable
+ */
+ol.geom.MultiPolygon.prototype.getPolygon = function(index) {
+  goog.asserts.assert(0 <= index && index < this.endss_.length,
+      'index should be in between 0 and the length of this.endss_');
+  if (index < 0 || this.endss_.length <= index) {
+    return null;
+  }
+  var offset;
+  if (index === 0) {
+    offset = 0;
+  } else {
+    var prevEnds = this.endss_[index - 1];
+    offset = prevEnds[prevEnds.length - 1];
+  }
+  var ends = this.endss_[index].slice();
+  var end = ends[ends.length - 1];
+  if (offset !== 0) {
+    var i, ii;
+    for (i = 0, ii = ends.length; i < ii; ++i) {
+      ends[i] -= offset;
+    }
+  }
+  var polygon = new ol.geom.Polygon(null);
+  polygon.setFlatCoordinates(
+      this.layout, this.flatCoordinates.slice(offset, end), ends);
+  return polygon;
+};
+
+
+/**
+ * Return the polygons of this multipolygon.
+ * @return {Array.<ol.geom.Polygon>} Polygons.
+ * @api stable
+ */
+ol.geom.MultiPolygon.prototype.getPolygons = function() {
+  var layout = this.layout;
+  var flatCoordinates = this.flatCoordinates;
+  var endss = this.endss_;
+  var polygons = [];
+  var offset = 0;
+  var i, ii, j, jj;
+  for (i = 0, ii = endss.length; i < ii; ++i) {
+    var ends = endss[i].slice();
+    var end = ends[ends.length - 1];
+    if (offset !== 0) {
+      for (j = 0, jj = ends.length; j < jj; ++j) {
+        ends[j] -= offset;
+      }
+    }
+    var polygon = new ol.geom.Polygon(null);
+    polygon.setFlatCoordinates(
+        layout, flatCoordinates.slice(offset, end), ends);
+    polygons.push(polygon);
+    offset = end;
+  }
+  return polygons;
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.MultiPolygon.prototype.getType = function() {
+  return ol.geom.GeometryType.MULTI_POLYGON;
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.MultiPolygon.prototype.intersectsExtent = function(extent) {
+  return ol.geom.flat.intersectsextent.linearRingss(
+      this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride, extent);
+};
+
+
+/**
+ * Set the coordinates of the multipolygon.
+ * @param {Array.<Array.<Array.<ol.Coordinate>>>} coordinates Coordinates.
+ * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @api stable
+ */
+ol.geom.MultiPolygon.prototype.setCoordinates =
+    function(coordinates, opt_layout) {
+  if (!coordinates) {
+    this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null, this.endss_);
+  } else {
+    this.setLayout(opt_layout, coordinates, 3);
+    if (!this.flatCoordinates) {
+      this.flatCoordinates = [];
+    }
+    var endss = ol.geom.flat.deflate.coordinatesss(
+        this.flatCoordinates, 0, coordinates, this.stride, this.endss_);
+    if (endss.length === 0) {
+      this.flatCoordinates.length = 0;
+    } else {
+      var lastEnds = endss[endss.length - 1];
+      this.flatCoordinates.length = lastEnds.length === 0 ?
+          0 : lastEnds[lastEnds.length - 1];
+    }
+    this.changed();
+  }
+};
+
+
+/**
+ * @param {ol.geom.GeometryLayout} layout Layout.
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {Array.<Array.<number>>} endss Endss.
+ */
+ol.geom.MultiPolygon.prototype.setFlatCoordinates =
+    function(layout, flatCoordinates, endss) {
+  goog.asserts.assert(endss, 'endss must be truthy');
+  if (!flatCoordinates || flatCoordinates.length === 0) {
+    goog.asserts.assert(endss.length === 0, 'the length of endss should be 0');
+  } else {
+    goog.asserts.assert(endss.length > 0, 'endss cannot be an empty array');
+    var ends = endss[endss.length - 1];
+    goog.asserts.assert(flatCoordinates.length == ends[ends.length - 1],
+        'the length of flatCoordinates should be the last value of ends');
+  }
+  this.setFlatCoordinatesInternal(layout, flatCoordinates);
+  this.endss_ = endss;
+  this.changed();
+};
+
+
+/**
+ * @param {Array.<ol.geom.Polygon>} polygons Polygons.
+ */
+ol.geom.MultiPolygon.prototype.setPolygons = function(polygons) {
+  var layout = this.getLayout();
+  var flatCoordinates = [];
+  var endss = [];
+  var i, ii, ends;
+  for (i = 0, ii = polygons.length; i < ii; ++i) {
+    var polygon = polygons[i];
+    if (i === 0) {
+      layout = polygon.getLayout();
+    } else {
+      // FIXME better handle the case of non-matching layouts
+      goog.asserts.assert(polygon.getLayout() == layout,
+          'layout of polygon should be layout');
+    }
+    var offset = flatCoordinates.length;
+    ends = polygon.getEnds();
+    var j, jj;
+    for (j = 0, jj = ends.length; j < jj; ++j) {
+      ends[j] += offset;
+    }
+    goog.array.extend(flatCoordinates, polygon.getFlatCoordinates());
+    endss.push(ends);
+  }
+  this.setFlatCoordinates(layout, flatCoordinates, endss);
+};
+
+goog.provide('ol.format.EsriJSON');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.object');
+goog.require('ol.Feature');
+goog.require('ol.extent');
+goog.require('ol.format.Feature');
+goog.require('ol.format.JSONFeature');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.GeometryType');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.LinearRing');
+goog.require('ol.geom.MultiLineString');
+goog.require('ol.geom.MultiPoint');
+goog.require('ol.geom.MultiPolygon');
+goog.require('ol.geom.Point');
+goog.require('ol.geom.Polygon');
+goog.require('ol.geom.flat.orient');
+goog.require('ol.proj');
+
+
+
+/**
+ * @classdesc
+ * Feature format for reading and writing data in the EsriJSON format.
+ *
+ * @constructor
+ * @extends {ol.format.JSONFeature}
+ * @param {olx.format.EsriJSONOptions=} opt_options Options.
+ * @api
+ */
+ol.format.EsriJSON = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  goog.base(this);
+
+  /**
+   * Name of the geometry attribute for features.
+   * @type {string|undefined}
+   * @private
+   */
+  this.geometryName_ = options.geometryName;
+
+};
+goog.inherits(ol.format.EsriJSON, ol.format.JSONFeature);
+
+
+/**
+ * @param {EsriJSONGeometry} object Object.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @private
+ * @return {ol.geom.Geometry} Geometry.
+ */
+ol.format.EsriJSON.readGeometry_ = function(object, opt_options) {
+  if (!object) {
+    return null;
+  }
+  var type;
+  if (goog.isNumber(object.x) && goog.isNumber(object.y)) {
+    type = ol.geom.GeometryType.POINT;
+  } else if (object.points) {
+    type = ol.geom.GeometryType.MULTI_POINT;
+  } else if (object.paths) {
+    if (object.paths.length === 1) {
+      type = ol.geom.GeometryType.LINE_STRING;
+    } else {
+      type = ol.geom.GeometryType.MULTI_LINE_STRING;
+    }
+  } else if (object.rings) {
+    var layout = ol.format.EsriJSON.getGeometryLayout_(object);
+    var rings = ol.format.EsriJSON.convertRings_(object.rings, layout);
+    object = /** @type {EsriJSONGeometry} */(goog.object.clone(object));
+    if (rings.length === 1) {
+      type = ol.geom.GeometryType.POLYGON;
+      object.rings = rings[0];
+    } else {
+      type = ol.geom.GeometryType.MULTI_POLYGON;
+      object.rings = rings;
+    }
+  }
+  goog.asserts.assert(type, 'geometry type should be defined');
+  var geometryReader = ol.format.EsriJSON.GEOMETRY_READERS_[type];
+  goog.asserts.assert(geometryReader,
+      'geometryReader should be defined');
+  return /** @type {ol.geom.Geometry} */ (
+      ol.format.Feature.transformWithOptions(
+          geometryReader(object), false, opt_options));
+};
+
+
+/**
+ * Determines inner and outer rings.
+ * Checks if any polygons in this array contain any other polygons in this
+ * array. It is used for checking for holes.
+ * Logic inspired by: https://github.com/Esri/terraformer-arcgis-parser
+ * @param {Array.<!Array.<!Array.<number>>>} rings Rings.
+ * @param {ol.geom.GeometryLayout} layout Geometry layout.
+ * @private
+ * @return {Array.<!Array.<!Array.<number>>>} Transoformed rings.
+ */
+ol.format.EsriJSON.convertRings_ = function(rings, layout) {
+  var outerRings = [];
+  var holes = [];
+  var i, ii;
+  for (i = 0, ii = rings.length; i < ii; ++i) {
+    var flatRing = goog.array.flatten(rings[i]);
+    // is this ring an outer ring? is it clockwise?
+    var clockwise = ol.geom.flat.orient.linearRingIsClockwise(flatRing, 0,
+        flatRing.length, layout.length);
+    if (clockwise) {
+      outerRings.push([rings[i]]);
+    } else {
+      holes.push(rings[i]);
+    }
+  }
+  while (holes.length) {
+    var hole = holes.shift();
+    var matched = false;
+    // loop over all outer rings and see if they contain our hole.
+    for (i = outerRings.length - 1; i >= 0; i--) {
+      var outerRing = outerRings[i][0];
+      if (ol.extent.containsExtent(new ol.geom.LinearRing(
+          outerRing).getExtent(),
+          new ol.geom.LinearRing(hole).getExtent())) {
+        // the hole is contained push it into our polygon
+        outerRings[i].push(hole);
+        matched = true;
+        break;
+      }
+    }
+    if (!matched) {
+      // no outer rings contain this hole turn it into and outer
+      // ring (reverse it)
+      outerRings.push([hole.reverse()]);
+    }
+  }
+  return outerRings;
+};
+
+
+/**
+ * @param {EsriJSONGeometry} object Object.
+ * @private
+ * @return {ol.geom.Geometry} Point.
+ */
+ol.format.EsriJSON.readPointGeometry_ = function(object) {
+  goog.asserts.assert(goog.isNumber(object.x), 'object.x should be number');
+  goog.asserts.assert(goog.isNumber(object.y), 'object.y should be number');
+  var point;
+  if (object.m !== undefined && object.z !== undefined) {
+    point = new ol.geom.Point([object.x, object.y, object.z, object.m],
+        ol.geom.GeometryLayout.XYZM);
+  } else if (object.z !== undefined) {
+    point = new ol.geom.Point([object.x, object.y, object.z],
+        ol.geom.GeometryLayout.XYZ);
+  } else if (object.m !== undefined) {
+    point = new ol.geom.Point([object.x, object.y, object.m],
+        ol.geom.GeometryLayout.XYM);
+  } else {
+    point = new ol.geom.Point([object.x, object.y]);
+  }
+  return point;
+};
+
+
+/**
+ * @param {EsriJSONGeometry} object Object.
+ * @private
+ * @return {ol.geom.Geometry} LineString.
+ */
+ol.format.EsriJSON.readLineStringGeometry_ = function(object) {
+  goog.asserts.assert(goog.isArray(object.paths),
+      'object.paths should be an array');
+  goog.asserts.assert(object.paths.length === 1,
+      'object.paths array length should be 1');
+  var layout = ol.format.EsriJSON.getGeometryLayout_(object);
+  return new ol.geom.LineString(object.paths[0], layout);
+};
+
+
+/**
+ * @param {EsriJSONGeometry} object Object.
+ * @private
+ * @return {ol.geom.Geometry} MultiLineString.
+ */
+ol.format.EsriJSON.readMultiLineStringGeometry_ = function(object) {
+  goog.asserts.assert(goog.isArray(object.paths),
+      'object.paths should be an array');
+  goog.asserts.assert(object.paths.length > 1,
+      'object.paths array length should be more than 1');
+  var layout = ol.format.EsriJSON.getGeometryLayout_(object);
+  return new ol.geom.MultiLineString(object.paths, layout);
+};
+
+
+/**
+ * @param {EsriJSONGeometry} object Object.
+ * @private
+ * @return {ol.geom.GeometryLayout} The geometry layout to use.
+ */
+ol.format.EsriJSON.getGeometryLayout_ = function(object) {
+  var layout = ol.geom.GeometryLayout.XY;
+  if (object.hasZ === true && object.hasM === true) {
+    layout = ol.geom.GeometryLayout.XYZM;
+  } else if (object.hasZ === true) {
+    layout = ol.geom.GeometryLayout.XYZ;
+  } else if (object.hasM === true) {
+    layout = ol.geom.GeometryLayout.XYM;
+  }
+  return layout;
+};
+
+
+/**
+ * @param {EsriJSONGeometry} object Object.
+ * @private
+ * @return {ol.geom.Geometry} MultiPoint.
+ */
+ol.format.EsriJSON.readMultiPointGeometry_ = function(object) {
+  goog.asserts.assert(object.points, 'object.points should be defined');
+  var layout = ol.format.EsriJSON.getGeometryLayout_(object);
+  return new ol.geom.MultiPoint(object.points, layout);
+};
+
+
+/**
+ * @param {EsriJSONGeometry} object Object.
+ * @private
+ * @return {ol.geom.Geometry} MultiPolygon.
+ */
+ol.format.EsriJSON.readMultiPolygonGeometry_ = function(object) {
+  goog.asserts.assert(object.rings);
+  goog.asserts.assert(object.rings.length > 1,
+      'object.rings should have length larger than 1');
+  var layout = ol.format.EsriJSON.getGeometryLayout_(object);
+  return new ol.geom.MultiPolygon(
+      /** @type {Array.<Array.<Array.<Array.<number>>>>} */(object.rings),
+      layout);
+};
+
+
+/**
+ * @param {EsriJSONGeometry} object Object.
+ * @private
+ * @return {ol.geom.Geometry} Polygon.
+ */
+ol.format.EsriJSON.readPolygonGeometry_ = function(object) {
+  goog.asserts.assert(object.rings);
+  var layout = ol.format.EsriJSON.getGeometryLayout_(object);
+  return new ol.geom.Polygon(object.rings, layout);
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @private
+ * @return {EsriJSONGeometry} EsriJSON geometry.
+ */
+ol.format.EsriJSON.writePointGeometry_ = function(geometry, opt_options) {
+  goog.asserts.assertInstanceof(geometry, ol.geom.Point,
+      'geometry should be an ol.geom.Point');
+  var coordinates = geometry.getCoordinates();
+  var layout = geometry.getLayout();
+  if (layout === ol.geom.GeometryLayout.XYZ) {
+    return /** @type {EsriJSONPoint} */ ({
+      x: coordinates[0],
+      y: coordinates[1],
+      z: coordinates[2]
+    });
+  } else if (layout === ol.geom.GeometryLayout.XYM) {
+    return /** @type {EsriJSONPoint} */ ({
+      x: coordinates[0],
+      y: coordinates[1],
+      m: coordinates[2]
+    });
+  } else if (layout === ol.geom.GeometryLayout.XYZM) {
+    return /** @type {EsriJSONPoint} */ ({
+      x: coordinates[0],
+      y: coordinates[1],
+      z: coordinates[2],
+      m: coordinates[3]
+    });
+  } else if (layout === ol.geom.GeometryLayout.XY) {
+    return /** @type {EsriJSONPoint} */ ({
+      x: coordinates[0],
+      y: coordinates[1]
+    });
+  } else {
+    goog.asserts.fail('Unknown geometry layout');
+  }
+};
+
+
+/**
+ * @param {ol.geom.SimpleGeometry} geometry Geometry.
+ * @private
+ * @return {Object} Object with boolean hasZ and hasM keys.
+ */
+ol.format.EsriJSON.getHasZM_ = function(geometry) {
+  var layout = geometry.getLayout();
+  return {
+    hasZ: (layout === ol.geom.GeometryLayout.XYZ ||
+        layout === ol.geom.GeometryLayout.XYZM),
+    hasM: (layout === ol.geom.GeometryLayout.XYM ||
+        layout === ol.geom.GeometryLayout.XYZM)
+  };
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @private
+ * @return {EsriJSONPolyline} EsriJSON geometry.
+ */
+ol.format.EsriJSON.writeLineStringGeometry_ = function(geometry, opt_options) {
+  goog.asserts.assertInstanceof(geometry, ol.geom.LineString,
+      'geometry should be an ol.geom.LineString');
+  var hasZM = ol.format.EsriJSON.getHasZM_(geometry);
+  return /** @type {EsriJSONPolyline} */ ({
+    hasZ: hasZM.hasZ,
+    hasM: hasZM.hasM,
+    paths: [geometry.getCoordinates()]
+  });
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @private
+ * @return {EsriJSONPolygon} EsriJSON geometry.
+ */
+ol.format.EsriJSON.writePolygonGeometry_ = function(geometry, opt_options) {
+  goog.asserts.assertInstanceof(geometry, ol.geom.Polygon,
+      'geometry should be an ol.geom.Polygon');
+  // Esri geometries use the left-hand rule
+  var hasZM = ol.format.EsriJSON.getHasZM_(geometry);
+  return /** @type {EsriJSONPolygon} */ ({
+    hasZ: hasZM.hasZ,
+    hasM: hasZM.hasM,
+    rings: geometry.getCoordinates(false)
+  });
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @private
+ * @return {EsriJSONPolyline} EsriJSON geometry.
+ */
+ol.format.EsriJSON.writeMultiLineStringGeometry_ =
+    function(geometry, opt_options) {
+  goog.asserts.assertInstanceof(geometry, ol.geom.MultiLineString,
+      'geometry should be an ol.geom.MultiLineString');
+  var hasZM = ol.format.EsriJSON.getHasZM_(geometry);
+  return /** @type {EsriJSONPolyline} */ ({
+    hasZ: hasZM.hasZ,
+    hasM: hasZM.hasM,
+    paths: geometry.getCoordinates()
+  });
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @private
+ * @return {EsriJSONMultipoint} EsriJSON geometry.
+ */
+ol.format.EsriJSON.writeMultiPointGeometry_ = function(geometry, opt_options) {
+  goog.asserts.assertInstanceof(geometry, ol.geom.MultiPoint,
+      'geometry should be an ol.geom.MultiPoint');
+  var hasZM = ol.format.EsriJSON.getHasZM_(geometry);
+  return /** @type {EsriJSONMultipoint} */ ({
+    hasZ: hasZM.hasZ,
+    hasM: hasZM.hasM,
+    points: geometry.getCoordinates()
+  });
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @private
+ * @return {EsriJSONPolygon} EsriJSON geometry.
+ */
+ol.format.EsriJSON.writeMultiPolygonGeometry_ = function(geometry,
+    opt_options) {
+  goog.asserts.assertInstanceof(geometry, ol.geom.MultiPolygon,
+      'geometry should be an ol.geom.MultiPolygon');
+  var hasZM = ol.format.EsriJSON.getHasZM_(geometry);
+  var coordinates = geometry.getCoordinates(false);
+  var output = [];
+  for (var i = 0; i < coordinates.length; i++) {
+    for (var x = coordinates[i].length - 1; x >= 0; x--) {
+      output.push(coordinates[i][x]);
+    }
+  }
+  return /** @type {EsriJSONPolygon} */ ({
+    hasZ: hasZM.hasZ,
+    hasM: hasZM.hasM,
+    rings: output
+  });
+};
+
+
+/**
+ * @const
+ * @private
+ * @type {Object.<ol.geom.GeometryType, function(EsriJSONGeometry): ol.geom.Geometry>}
+ */
+ol.format.EsriJSON.GEOMETRY_READERS_ = {};
+ol.format.EsriJSON.GEOMETRY_READERS_[ol.geom.GeometryType.POINT] =
+    ol.format.EsriJSON.readPointGeometry_;
+ol.format.EsriJSON.GEOMETRY_READERS_[ol.geom.GeometryType.LINE_STRING] =
+    ol.format.EsriJSON.readLineStringGeometry_;
+ol.format.EsriJSON.GEOMETRY_READERS_[ol.geom.GeometryType.POLYGON] =
+    ol.format.EsriJSON.readPolygonGeometry_;
+ol.format.EsriJSON.GEOMETRY_READERS_[ol.geom.GeometryType.MULTI_POINT] =
+    ol.format.EsriJSON.readMultiPointGeometry_;
+ol.format.EsriJSON.GEOMETRY_READERS_[ol.geom.GeometryType.MULTI_LINE_STRING] =
+    ol.format.EsriJSON.readMultiLineStringGeometry_;
+ol.format.EsriJSON.GEOMETRY_READERS_[ol.geom.GeometryType.MULTI_POLYGON] =
+    ol.format.EsriJSON.readMultiPolygonGeometry_;
+
+
+/**
+ * @const
+ * @private
+ * @type {Object.<string, function(ol.geom.Geometry, olx.format.WriteOptions=): (EsriJSONGeometry)>}
+ */
+ol.format.EsriJSON.GEOMETRY_WRITERS_ = {};
+ol.format.EsriJSON.GEOMETRY_WRITERS_[ol.geom.GeometryType.POINT] =
+    ol.format.EsriJSON.writePointGeometry_;
+ol.format.EsriJSON.GEOMETRY_WRITERS_[ol.geom.GeometryType.LINE_STRING] =
+    ol.format.EsriJSON.writeLineStringGeometry_;
+ol.format.EsriJSON.GEOMETRY_WRITERS_[ol.geom.GeometryType.POLYGON] =
+    ol.format.EsriJSON.writePolygonGeometry_;
+ol.format.EsriJSON.GEOMETRY_WRITERS_[ol.geom.GeometryType.MULTI_POINT] =
+    ol.format.EsriJSON.writeMultiPointGeometry_;
+ol.format.EsriJSON.GEOMETRY_WRITERS_[ol.geom.GeometryType.MULTI_LINE_STRING] =
+    ol.format.EsriJSON.writeMultiLineStringGeometry_;
+ol.format.EsriJSON.GEOMETRY_WRITERS_[ol.geom.GeometryType.MULTI_POLYGON] =
+    ol.format.EsriJSON.writeMultiPolygonGeometry_;
+
+
+/**
+ * Read a feature from a EsriJSON Feature source.  Only works for Feature,
+ * use `readFeatures` to read FeatureCollection source.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {ol.Feature} Feature.
+ * @api
+ */
+ol.format.EsriJSON.prototype.readFeature;
+
+
+/**
+ * Read all features from a EsriJSON source.  Works with both Feature and
+ * FeatureCollection sources.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {Array.<ol.Feature>} Features.
+ * @api
+ */
+ol.format.EsriJSON.prototype.readFeatures;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.EsriJSON.prototype.readFeatureFromObject = function(
+    object, opt_options) {
+  var esriJSONFeature = /** @type {EsriJSONFeature} */ (object);
+  goog.asserts.assert(esriJSONFeature.geometry ||
+      esriJSONFeature.attributes,
+      'geometry or attributes should be defined');
+  var geometry = ol.format.EsriJSON.readGeometry_(esriJSONFeature.geometry,
+      opt_options);
+  var feature = new ol.Feature();
+  if (this.geometryName_) {
+    feature.setGeometryName(this.geometryName_);
+  }
+  feature.setGeometry(geometry);
+  if (opt_options && opt_options.idField &&
+      esriJSONFeature.attributes[opt_options.idField]) {
+    goog.asserts.assert(
+        goog.isNumber(esriJSONFeature.attributes[opt_options.idField]),
+        'objectIdFieldName value should be a number');
+    feature.setId(/** @type {number} */(
+        esriJSONFeature.attributes[opt_options.idField]));
+  }
+  if (esriJSONFeature.attributes) {
+    feature.setProperties(esriJSONFeature.attributes);
+  }
+  return feature;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.EsriJSON.prototype.readFeaturesFromObject = function(
+    object, opt_options) {
+  var esriJSONObject = /** @type {EsriJSONObject} */ (object);
+  var options = opt_options ? opt_options : {};
+  if (esriJSONObject.features) {
+    var esriJSONFeatureCollection = /** @type {EsriJSONFeatureCollection} */
+        (object);
+    /** @type {Array.<ol.Feature>} */
+    var features = [];
+    var esriJSONFeatures = esriJSONFeatureCollection.features;
+    var i, ii;
+    options.idField = object.objectIdFieldName;
+    for (i = 0, ii = esriJSONFeatures.length; i < ii; ++i) {
+      features.push(this.readFeatureFromObject(esriJSONFeatures[i],
+          options));
+    }
+    return features;
+  } else {
+    return [this.readFeatureFromObject(object, options)];
+  }
+};
+
+
+/**
+ * Read a geometry from a EsriJSON source.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {ol.geom.Geometry} Geometry.
+ * @api
+ */
+ol.format.EsriJSON.prototype.readGeometry;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.EsriJSON.prototype.readGeometryFromObject = function(
+    object, opt_options) {
+  return ol.format.EsriJSON.readGeometry_(
+      /** @type {EsriJSONGeometry} */ (object), opt_options);
+};
+
+
+/**
+ * Read the projection from a EsriJSON source.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @return {ol.proj.Projection} Projection.
+ * @api
+ */
+ol.format.EsriJSON.prototype.readProjection;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.EsriJSON.prototype.readProjectionFromObject = function(object) {
+  var esriJSONObject = /** @type {EsriJSONObject} */ (object);
+  if (esriJSONObject.spatialReference && esriJSONObject.spatialReference.wkid) {
+    var crs = esriJSONObject.spatialReference.wkid;
+    return ol.proj.get('EPSG:' + crs);
+  } else {
+    return null;
+  }
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @private
+ * @return {EsriJSONGeometry} EsriJSON geometry.
+ */
+ol.format.EsriJSON.writeGeometry_ = function(geometry, opt_options) {
+  var geometryWriter = ol.format.EsriJSON.GEOMETRY_WRITERS_[geometry.getType()];
+  goog.asserts.assert(geometryWriter, 'geometryWriter should be defined');
+  return geometryWriter(/** @type {ol.geom.Geometry} */ (
+      ol.format.Feature.transformWithOptions(geometry, true, opt_options)),
+      opt_options);
+};
+
+
+/**
+ * Encode a geometry as a EsriJSON string.
+ *
+ * @function
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {string} EsriJSON.
+ * @api
+ */
+ol.format.EsriJSON.prototype.writeGeometry;
+
+
+/**
+ * Encode a geometry as a EsriJSON object.
+ *
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {EsriJSONGeometry} Object.
+ * @api
+ */
+ol.format.EsriJSON.prototype.writeGeometryObject = function(geometry,
+    opt_options) {
+  return ol.format.EsriJSON.writeGeometry_(geometry,
+      this.adaptOptions(opt_options));
+};
+
+
+/**
+ * Encode a feature as a EsriJSON Feature string.
+ *
+ * @function
+ * @param {ol.Feature} feature Feature.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {string} EsriJSON.
+ * @api
+ */
+ol.format.EsriJSON.prototype.writeFeature;
+
+
+/**
+ * Encode a feature as a esriJSON Feature object.
+ *
+ * @param {ol.Feature} feature Feature.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {Object} Object.
+ * @api
+ */
+ol.format.EsriJSON.prototype.writeFeatureObject = function(
+    feature, opt_options) {
+  opt_options = this.adaptOptions(opt_options);
+  var object = {};
+  var geometry = feature.getGeometry();
+  if (geometry) {
+    object['geometry'] =
+        ol.format.EsriJSON.writeGeometry_(geometry, opt_options);
+  }
+  var properties = feature.getProperties();
+  delete properties[feature.getGeometryName()];
+  if (!goog.object.isEmpty(properties)) {
+    object['attributes'] = properties;
+  } else {
+    object['attributes'] = {};
+  }
+  if (opt_options && opt_options.featureProjection) {
+    object['spatialReference'] = /** @type {EsriJSONCRS} */({
+      wkid: ol.proj.get(
+          opt_options.featureProjection).getCode().split(':').pop()
+    });
+  }
+  return object;
+};
+
+
+/**
+ * Encode an array of features as EsriJSON.
+ *
+ * @function
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {string} EsriJSON.
+ * @api
+ */
+ol.format.EsriJSON.prototype.writeFeatures;
+
+
+/**
+ * Encode an array of features as a EsriJSON object.
+ *
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {Object} EsriJSON Object.
+ * @api
+ */
+ol.format.EsriJSON.prototype.writeFeaturesObject =
+    function(features, opt_options) {
+  opt_options = this.adaptOptions(opt_options);
+  var objects = [];
+  var i, ii;
+  for (i = 0, ii = features.length; i < ii; ++i) {
+    objects.push(this.writeFeatureObject(features[i], opt_options));
+  }
+  return /** @type {EsriJSONFeatureCollection} */ ({
+    'features': objects
+  });
+};
+
+goog.provide('ol.geom.GeometryCollection');
+
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('goog.object');
+goog.require('ol.extent');
+goog.require('ol.geom.Geometry');
+goog.require('ol.geom.GeometryType');
+
+
+
+/**
+ * @classdesc
+ * An array of {@link ol.geom.Geometry} objects.
+ *
+ * @constructor
+ * @extends {ol.geom.Geometry}
+ * @param {Array.<ol.geom.Geometry>=} opt_geometries Geometries.
+ * @api stable
+ */
+ol.geom.GeometryCollection = function(opt_geometries) {
+
+  goog.base(this);
+
+  /**
+   * @private
+   * @type {Array.<ol.geom.Geometry>}
+   */
+  this.geometries_ = opt_geometries ? opt_geometries : null;
+
+  this.listenGeometriesChange_();
+};
+goog.inherits(ol.geom.GeometryCollection, ol.geom.Geometry);
+
+
+/**
+ * @param {Array.<ol.geom.Geometry>} geometries Geometries.
+ * @private
+ * @return {Array.<ol.geom.Geometry>} Cloned geometries.
+ */
+ol.geom.GeometryCollection.cloneGeometries_ = function(geometries) {
+  var clonedGeometries = [];
+  var i, ii;
+  for (i = 0, ii = geometries.length; i < ii; ++i) {
+    clonedGeometries.push(geometries[i].clone());
+  }
+  return clonedGeometries;
+};
+
+
+/**
+ * @private
+ */
+ol.geom.GeometryCollection.prototype.unlistenGeometriesChange_ = function() {
+  var i, ii;
+  if (!this.geometries_) {
+    return;
+  }
+  for (i = 0, ii = this.geometries_.length; i < ii; ++i) {
+    goog.events.unlisten(
+        this.geometries_[i], goog.events.EventType.CHANGE,
+        this.changed, false, this);
+  }
+};
+
+
+/**
+ * @private
+ */
+ol.geom.GeometryCollection.prototype.listenGeometriesChange_ = function() {
+  var i, ii;
+  if (!this.geometries_) {
+    return;
+  }
+  for (i = 0, ii = this.geometries_.length; i < ii; ++i) {
+    goog.events.listen(
+        this.geometries_[i], goog.events.EventType.CHANGE,
+        this.changed, false, this);
+  }
+};
+
+
+/**
+ * Make a complete copy of the geometry.
+ * @return {!ol.geom.GeometryCollection} Clone.
+ * @api stable
+ */
+ol.geom.GeometryCollection.prototype.clone = function() {
+  var geometryCollection = new ol.geom.GeometryCollection(null);
+  geometryCollection.setGeometries(this.geometries_);
+  return geometryCollection;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.GeometryCollection.prototype.closestPointXY =
+    function(x, y, closestPoint, minSquaredDistance) {
+  if (minSquaredDistance <
+      ol.extent.closestSquaredDistanceXY(this.getExtent(), x, y)) {
+    return minSquaredDistance;
+  }
+  var geometries = this.geometries_;
+  var i, ii;
+  for (i = 0, ii = geometries.length; i < ii; ++i) {
+    minSquaredDistance = geometries[i].closestPointXY(
+        x, y, closestPoint, minSquaredDistance);
+  }
+  return minSquaredDistance;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.GeometryCollection.prototype.containsXY = function(x, y) {
+  var geometries = this.geometries_;
+  var i, ii;
+  for (i = 0, ii = geometries.length; i < ii; ++i) {
+    if (geometries[i].containsXY(x, y)) {
+      return true;
+    }
+  }
+  return false;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.GeometryCollection.prototype.computeExtent = function(extent) {
+  ol.extent.createOrUpdateEmpty(extent);
+  var geometries = this.geometries_;
+  for (var i = 0, ii = geometries.length; i < ii; ++i) {
+    ol.extent.extend(extent, geometries[i].getExtent());
+  }
+  return extent;
+};
+
+
+/**
+ * Return the geometries that make up this geometry collection.
+ * @return {Array.<ol.geom.Geometry>} Geometries.
+ * @api stable
+ */
+ol.geom.GeometryCollection.prototype.getGeometries = function() {
+  return ol.geom.GeometryCollection.cloneGeometries_(this.geometries_);
+};
+
+
+/**
+ * @return {Array.<ol.geom.Geometry>} Geometries.
+ */
+ol.geom.GeometryCollection.prototype.getGeometriesArray = function() {
+  return this.geometries_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.GeometryCollection.prototype.getSimplifiedGeometry =
+    function(squaredTolerance) {
+  if (this.simplifiedGeometryRevision != this.getRevision()) {
+    goog.object.clear(this.simplifiedGeometryCache);
+    this.simplifiedGeometryMaxMinSquaredTolerance = 0;
+    this.simplifiedGeometryRevision = this.getRevision();
+  }
+  if (squaredTolerance < 0 ||
+      (this.simplifiedGeometryMaxMinSquaredTolerance !== 0 &&
+       squaredTolerance < this.simplifiedGeometryMaxMinSquaredTolerance)) {
+    return this;
+  }
+  var key = squaredTolerance.toString();
+  if (this.simplifiedGeometryCache.hasOwnProperty(key)) {
+    return this.simplifiedGeometryCache[key];
+  } else {
+    var simplifiedGeometries = [];
+    var geometries = this.geometries_;
+    var simplified = false;
+    var i, ii;
+    for (i = 0, ii = geometries.length; i < ii; ++i) {
+      var geometry = geometries[i];
+      var simplifiedGeometry = geometry.getSimplifiedGeometry(squaredTolerance);
+      simplifiedGeometries.push(simplifiedGeometry);
+      if (simplifiedGeometry !== geometry) {
+        simplified = true;
+      }
+    }
+    if (simplified) {
+      var simplifiedGeometryCollection = new ol.geom.GeometryCollection(null);
+      simplifiedGeometryCollection.setGeometriesArray(simplifiedGeometries);
+      this.simplifiedGeometryCache[key] = simplifiedGeometryCollection;
+      return simplifiedGeometryCollection;
+    } else {
+      this.simplifiedGeometryMaxMinSquaredTolerance = squaredTolerance;
+      return this;
+    }
+  }
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.GeometryCollection.prototype.getType = function() {
+  return ol.geom.GeometryType.GEOMETRY_COLLECTION;
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.GeometryCollection.prototype.intersectsExtent = function(extent) {
+  var geometries = this.geometries_;
+  var i, ii;
+  for (i = 0, ii = geometries.length; i < ii; ++i) {
+    if (geometries[i].intersectsExtent(extent)) {
+      return true;
+    }
+  }
+  return false;
+};
+
+
+/**
+ * @return {boolean} Is empty.
+ */
+ol.geom.GeometryCollection.prototype.isEmpty = function() {
+  return this.geometries_.length === 0;
+};
+
+
+/**
+ * Set the geometries that make up this geometry collection.
+ * @param {Array.<ol.geom.Geometry>} geometries Geometries.
+ * @api stable
+ */
+ol.geom.GeometryCollection.prototype.setGeometries = function(geometries) {
+  this.setGeometriesArray(
+      ol.geom.GeometryCollection.cloneGeometries_(geometries));
+};
+
+
+/**
+ * @param {Array.<ol.geom.Geometry>} geometries Geometries.
+ */
+ol.geom.GeometryCollection.prototype.setGeometriesArray = function(geometries) {
+  this.unlistenGeometriesChange_();
+  this.geometries_ = geometries;
+  this.listenGeometriesChange_();
+  this.changed();
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.GeometryCollection.prototype.applyTransform = function(transformFn) {
+  var geometries = this.geometries_;
+  var i, ii;
+  for (i = 0, ii = geometries.length; i < ii; ++i) {
+    geometries[i].applyTransform(transformFn);
+  }
+  this.changed();
+};
+
+
+/**
+ * Translate the geometry.
+ * @param {number} deltaX Delta X.
+ * @param {number} deltaY Delta Y.
+ * @api
+ */
+ol.geom.GeometryCollection.prototype.translate = function(deltaX, deltaY) {
+  var geometries = this.geometries_;
+  var i, ii;
+  for (i = 0, ii = geometries.length; i < ii; ++i) {
+    geometries[i].translate(deltaX, deltaY);
+  }
+  this.changed();
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.GeometryCollection.prototype.disposeInternal = function() {
+  this.unlistenGeometriesChange_();
+  goog.base(this, 'disposeInternal');
+};
+
+// TODO: serialize dataProjection as crs member when writing
+// see https://github.com/openlayers/ol3/issues/2078
+
+goog.provide('ol.format.GeoJSON');
+
+goog.require('goog.asserts');
+goog.require('goog.object');
+goog.require('ol.Feature');
+goog.require('ol.format.Feature');
+goog.require('ol.format.JSONFeature');
+goog.require('ol.geom.GeometryCollection');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.MultiLineString');
+goog.require('ol.geom.MultiPoint');
+goog.require('ol.geom.MultiPolygon');
+goog.require('ol.geom.Point');
+goog.require('ol.geom.Polygon');
+goog.require('ol.proj');
+
+
+
+/**
+ * @classdesc
+ * Feature format for reading and writing data in the GeoJSON format.
+ *
+ * @constructor
+ * @extends {ol.format.JSONFeature}
+ * @param {olx.format.GeoJSONOptions=} opt_options Options.
+ * @api stable
+ */
+ol.format.GeoJSON = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  goog.base(this);
+
+  /**
+   * @inheritDoc
+   */
+  this.defaultDataProjection = ol.proj.get(
+      options.defaultDataProjection ?
+          options.defaultDataProjection : 'EPSG:4326');
+
+
+  /**
+   * Name of the geometry attribute for features.
+   * @type {string|undefined}
+   * @private
+   */
+  this.geometryName_ = options.geometryName;
+
+};
+goog.inherits(ol.format.GeoJSON, ol.format.JSONFeature);
+
+
+/**
+ * @const
+ * @type {Array.<string>}
+ * @private
+ */
+ol.format.GeoJSON.EXTENSIONS_ = ['.geojson'];
+
+
+/**
+ * @param {GeoJSONGeometry|GeoJSONGeometryCollection} object Object.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @private
+ * @return {ol.geom.Geometry} Geometry.
+ */
+ol.format.GeoJSON.readGeometry_ = function(object, opt_options) {
+  if (!object) {
+    return null;
+  }
+  var geometryReader = ol.format.GeoJSON.GEOMETRY_READERS_[object.type];
+  goog.asserts.assert(geometryReader, 'geometryReader should be defined');
+  return /** @type {ol.geom.Geometry} */ (
+      ol.format.Feature.transformWithOptions(
+          geometryReader(object), false, opt_options));
+};
+
+
+/**
+ * @param {GeoJSONGeometryCollection} object Object.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @private
+ * @return {ol.geom.GeometryCollection} Geometry collection.
+ */
+ol.format.GeoJSON.readGeometryCollectionGeometry_ = function(
+    object, opt_options) {
+  goog.asserts.assert(object.type == 'GeometryCollection',
+      'object.type should be GeometryCollection');
+  var geometries = object.geometries.map(
+      /**
+       * @param {GeoJSONGeometry} geometry Geometry.
+       * @return {ol.geom.Geometry} geometry Geometry.
+       */
+      function(geometry) {
+        return ol.format.GeoJSON.readGeometry_(geometry, opt_options);
+      });
+  return new ol.geom.GeometryCollection(geometries);
+};
+
+
+/**
+ * @param {GeoJSONGeometry} object Object.
+ * @private
+ * @return {ol.geom.Point} Point.
+ */
+ol.format.GeoJSON.readPointGeometry_ = function(object) {
+  goog.asserts.assert(object.type == 'Point',
+      'object.type should be Point');
+  return new ol.geom.Point(object.coordinates);
+};
+
+
+/**
+ * @param {GeoJSONGeometry} object Object.
+ * @private
+ * @return {ol.geom.LineString} LineString.
+ */
+ol.format.GeoJSON.readLineStringGeometry_ = function(object) {
+  goog.asserts.assert(object.type == 'LineString',
+      'object.type should be LineString');
+  return new ol.geom.LineString(object.coordinates);
+};
+
+
+/**
+ * @param {GeoJSONGeometry} object Object.
+ * @private
+ * @return {ol.geom.MultiLineString} MultiLineString.
+ */
+ol.format.GeoJSON.readMultiLineStringGeometry_ = function(object) {
+  goog.asserts.assert(object.type == 'MultiLineString',
+      'object.type should be MultiLineString');
+  return new ol.geom.MultiLineString(object.coordinates);
+};
+
+
+/**
+ * @param {GeoJSONGeometry} object Object.
+ * @private
+ * @return {ol.geom.MultiPoint} MultiPoint.
+ */
+ol.format.GeoJSON.readMultiPointGeometry_ = function(object) {
+  goog.asserts.assert(object.type == 'MultiPoint',
+      'object.type should be MultiPoint');
+  return new ol.geom.MultiPoint(object.coordinates);
+};
+
+
+/**
+ * @param {GeoJSONGeometry} object Object.
+ * @private
+ * @return {ol.geom.MultiPolygon} MultiPolygon.
+ */
+ol.format.GeoJSON.readMultiPolygonGeometry_ = function(object) {
+  goog.asserts.assert(object.type == 'MultiPolygon',
+      'object.type should be MultiPolygon');
+  return new ol.geom.MultiPolygon(object.coordinates);
+};
+
+
+/**
+ * @param {GeoJSONGeometry} object Object.
+ * @private
+ * @return {ol.geom.Polygon} Polygon.
+ */
+ol.format.GeoJSON.readPolygonGeometry_ = function(object) {
+  goog.asserts.assert(object.type == 'Polygon',
+      'object.type should be Polygon');
+  return new ol.geom.Polygon(object.coordinates);
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @private
+ * @return {GeoJSONGeometry|GeoJSONGeometryCollection} GeoJSON geometry.
+ */
+ol.format.GeoJSON.writeGeometry_ = function(geometry, opt_options) {
+  var geometryWriter = ol.format.GeoJSON.GEOMETRY_WRITERS_[geometry.getType()];
+  goog.asserts.assert(geometryWriter, 'geometryWriter should be defined');
+  return geometryWriter(/** @type {ol.geom.Geometry} */ (
+      ol.format.Feature.transformWithOptions(geometry, true, opt_options)),
+      opt_options);
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @private
+ * @return {GeoJSONGeometryCollection} Empty GeoJSON geometry collection.
+ */
+ol.format.GeoJSON.writeEmptyGeometryCollectionGeometry_ = function(geometry) {
+  return /** @type {GeoJSONGeometryCollection} */ ({
+    type: 'GeometryCollection',
+    geometries: []
+  });
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @private
+ * @return {GeoJSONGeometryCollection} GeoJSON geometry collection.
+ */
+ol.format.GeoJSON.writeGeometryCollectionGeometry_ = function(
+    geometry, opt_options) {
+  goog.asserts.assertInstanceof(geometry, ol.geom.GeometryCollection,
+      'geometry should be an ol.geom.GeometryCollection');
+  var geometries = geometry.getGeometriesArray().map(function(geometry) {
+    return ol.format.GeoJSON.writeGeometry_(geometry, opt_options);
+  });
+  return /** @type {GeoJSONGeometryCollection} */ ({
+    type: 'GeometryCollection',
+    geometries: geometries
+  });
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @private
+ * @return {GeoJSONGeometry} GeoJSON geometry.
+ */
+ol.format.GeoJSON.writeLineStringGeometry_ = function(geometry, opt_options) {
+  goog.asserts.assertInstanceof(geometry, ol.geom.LineString,
+      'geometry should be an ol.geom.LineString');
+  return /** @type {GeoJSONGeometry} */ ({
+    type: 'LineString',
+    coordinates: geometry.getCoordinates()
+  });
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @private
+ * @return {GeoJSONGeometry} GeoJSON geometry.
+ */
+ol.format.GeoJSON.writeMultiLineStringGeometry_ =
+    function(geometry, opt_options) {
+  goog.asserts.assertInstanceof(geometry, ol.geom.MultiLineString,
+      'geometry should be an ol.geom.MultiLineString');
+  return /** @type {GeoJSONGeometry} */ ({
+    type: 'MultiLineString',
+    coordinates: geometry.getCoordinates()
+  });
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @private
+ * @return {GeoJSONGeometry} GeoJSON geometry.
+ */
+ol.format.GeoJSON.writeMultiPointGeometry_ = function(geometry, opt_options) {
+  goog.asserts.assertInstanceof(geometry, ol.geom.MultiPoint,
+      'geometry should be an ol.geom.MultiPoint');
+  return /** @type {GeoJSONGeometry} */ ({
+    type: 'MultiPoint',
+    coordinates: geometry.getCoordinates()
+  });
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @private
+ * @return {GeoJSONGeometry} GeoJSON geometry.
+ */
+ol.format.GeoJSON.writeMultiPolygonGeometry_ = function(geometry, opt_options) {
+  goog.asserts.assertInstanceof(geometry, ol.geom.MultiPolygon,
+      'geometry should be an ol.geom.MultiPolygon');
+  var right;
+  if (opt_options) {
+    right = opt_options.rightHanded;
+  }
+  return /** @type {GeoJSONGeometry} */ ({
+    type: 'MultiPolygon',
+    coordinates: geometry.getCoordinates(right)
+  });
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @private
+ * @return {GeoJSONGeometry} GeoJSON geometry.
+ */
+ol.format.GeoJSON.writePointGeometry_ = function(geometry, opt_options) {
+  goog.asserts.assertInstanceof(geometry, ol.geom.Point,
+      'geometry should be an ol.geom.Point');
+  return /** @type {GeoJSONGeometry} */ ({
+    type: 'Point',
+    coordinates: geometry.getCoordinates()
+  });
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @private
+ * @return {GeoJSONGeometry} GeoJSON geometry.
+ */
+ol.format.GeoJSON.writePolygonGeometry_ = function(geometry, opt_options) {
+  goog.asserts.assertInstanceof(geometry, ol.geom.Polygon,
+      'geometry should be an ol.geom.Polygon');
+  var right;
+  if (opt_options) {
+    right = opt_options.rightHanded;
+  }
+  return /** @type {GeoJSONGeometry} */ ({
+    type: 'Polygon',
+    coordinates: geometry.getCoordinates(right)
+  });
+};
+
+
+/**
+ * @const
+ * @private
+ * @type {Object.<string, function(GeoJSONObject): ol.geom.Geometry>}
+ */
+ol.format.GeoJSON.GEOMETRY_READERS_ = {
+  'Point': ol.format.GeoJSON.readPointGeometry_,
+  'LineString': ol.format.GeoJSON.readLineStringGeometry_,
+  'Polygon': ol.format.GeoJSON.readPolygonGeometry_,
+  'MultiPoint': ol.format.GeoJSON.readMultiPointGeometry_,
+  'MultiLineString': ol.format.GeoJSON.readMultiLineStringGeometry_,
+  'MultiPolygon': ol.format.GeoJSON.readMultiPolygonGeometry_,
+  'GeometryCollection': ol.format.GeoJSON.readGeometryCollectionGeometry_
+};
+
+
+/**
+ * @const
+ * @private
+ * @type {Object.<string, function(ol.geom.Geometry, olx.format.WriteOptions=): (GeoJSONGeometry|GeoJSONGeometryCollection)>}
+ */
+ol.format.GeoJSON.GEOMETRY_WRITERS_ = {
+  'Point': ol.format.GeoJSON.writePointGeometry_,
+  'LineString': ol.format.GeoJSON.writeLineStringGeometry_,
+  'Polygon': ol.format.GeoJSON.writePolygonGeometry_,
+  'MultiPoint': ol.format.GeoJSON.writeMultiPointGeometry_,
+  'MultiLineString': ol.format.GeoJSON.writeMultiLineStringGeometry_,
+  'MultiPolygon': ol.format.GeoJSON.writeMultiPolygonGeometry_,
+  'GeometryCollection': ol.format.GeoJSON.writeGeometryCollectionGeometry_,
+  'Circle': ol.format.GeoJSON.writeEmptyGeometryCollectionGeometry_
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.GeoJSON.prototype.getExtensions = function() {
+  return ol.format.GeoJSON.EXTENSIONS_;
+};
+
+
+/**
+ * Read a feature from a GeoJSON Feature source.  Only works for Feature,
+ * use `readFeatures` to read FeatureCollection source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {ol.Feature} Feature.
+ * @api stable
+ */
+ol.format.GeoJSON.prototype.readFeature;
+
+
+/**
+ * Read all features from a GeoJSON source.  Works with both Feature and
+ * FeatureCollection sources.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {Array.<ol.Feature>} Features.
+ * @api stable
+ */
+ol.format.GeoJSON.prototype.readFeatures;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.GeoJSON.prototype.readFeatureFromObject = function(
+    object, opt_options) {
+  var geoJSONFeature = /** @type {GeoJSONFeature} */ (object);
+  goog.asserts.assert(geoJSONFeature.type == 'Feature',
+      'geoJSONFeature.type should be Feature');
+  var geometry = ol.format.GeoJSON.readGeometry_(geoJSONFeature.geometry,
+      opt_options);
+  var feature = new ol.Feature();
+  if (this.geometryName_) {
+    feature.setGeometryName(this.geometryName_);
+  }
+  feature.setGeometry(geometry);
+  if (geoJSONFeature.id !== undefined) {
+    feature.setId(geoJSONFeature.id);
+  }
+  if (geoJSONFeature.properties) {
+    feature.setProperties(geoJSONFeature.properties);
+  }
+  return feature;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.GeoJSON.prototype.readFeaturesFromObject = function(
+    object, opt_options) {
+  var geoJSONObject = /** @type {GeoJSONObject} */ (object);
+  if (geoJSONObject.type == 'Feature') {
+    return [this.readFeatureFromObject(object, opt_options)];
+  } else if (geoJSONObject.type == 'FeatureCollection') {
+    var geoJSONFeatureCollection = /** @type {GeoJSONFeatureCollection} */
+        (object);
+    /** @type {Array.<ol.Feature>} */
+    var features = [];
+    var geoJSONFeatures = geoJSONFeatureCollection.features;
+    var i, ii;
+    for (i = 0, ii = geoJSONFeatures.length; i < ii; ++i) {
+      features.push(this.readFeatureFromObject(geoJSONFeatures[i],
+          opt_options));
+    }
+    return features;
+  } else {
+    goog.asserts.fail('Unknown geoJSONObject.type: ' + geoJSONObject.type);
+    return [];
+  }
+};
+
+
+/**
+ * Read a geometry from a GeoJSON source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {ol.geom.Geometry} Geometry.
+ * @api stable
+ */
+ol.format.GeoJSON.prototype.readGeometry;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.GeoJSON.prototype.readGeometryFromObject = function(
+    object, opt_options) {
+  return ol.format.GeoJSON.readGeometry_(
+      /** @type {GeoJSONGeometry} */ (object), opt_options);
+};
+
+
+/**
+ * Read the projection from a GeoJSON source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @return {ol.proj.Projection} Projection.
+ * @api stable
+ */
+ol.format.GeoJSON.prototype.readProjection;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.GeoJSON.prototype.readProjectionFromObject = function(object) {
+  var geoJSONObject = /** @type {GeoJSONObject} */ (object);
+  var crs = geoJSONObject.crs;
+  if (crs) {
+    if (crs.type == 'name') {
+      return ol.proj.get(crs.properties.name);
+    } else if (crs.type == 'EPSG') {
+      // 'EPSG' is not part of the GeoJSON specification, but is generated by
+      // GeoServer.
+      // TODO: remove this when http://jira.codehaus.org/browse/GEOS-5996
+      // is fixed and widely deployed.
+      return ol.proj.get('EPSG:' + crs.properties.code);
+    } else {
+      goog.asserts.fail('Unknown crs.type: ' + crs.type);
+      return null;
+    }
+  } else {
+    return this.defaultDataProjection;
+  }
+};
+
+
+/**
+ * Encode a feature as a GeoJSON Feature string.
+ *
+ * @function
+ * @param {ol.Feature} feature Feature.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {string} GeoJSON.
+ * @api stable
+ */
+ol.format.GeoJSON.prototype.writeFeature;
+
+
+/**
+ * Encode a feature as a GeoJSON Feature object.
+ *
+ * @param {ol.Feature} feature Feature.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {Object} Object.
+ * @api stable
+ */
+ol.format.GeoJSON.prototype.writeFeatureObject = function(
+    feature, opt_options) {
+  opt_options = this.adaptOptions(opt_options);
+  var object = {
+    'type': 'Feature'
+  };
+  var id = feature.getId();
+  if (id !== undefined) {
+    object['id'] = id;
+  }
+  var geometry = feature.getGeometry();
+  if (geometry) {
+    object['geometry'] =
+        ol.format.GeoJSON.writeGeometry_(geometry, opt_options);
+  } else {
+    object['geometry'] = null;
+  }
+  var properties = feature.getProperties();
+  delete properties[feature.getGeometryName()];
+  if (!goog.object.isEmpty(properties)) {
+    object['properties'] = properties;
+  } else {
+    object['properties'] = null;
+  }
+  return object;
+};
+
+
+/**
+ * Encode an array of features as GeoJSON.
+ *
+ * @function
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {string} GeoJSON.
+ * @api stable
+ */
+ol.format.GeoJSON.prototype.writeFeatures;
+
+
+/**
+ * Encode an array of features as a GeoJSON object.
+ *
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {Object} GeoJSON Object.
+ * @api stable
+ */
+ol.format.GeoJSON.prototype.writeFeaturesObject =
+    function(features, opt_options) {
+  opt_options = this.adaptOptions(opt_options);
+  var objects = [];
+  var i, ii;
+  for (i = 0, ii = features.length; i < ii; ++i) {
+    objects.push(this.writeFeatureObject(features[i], opt_options));
+  }
+  return /** @type {GeoJSONFeatureCollection} */ ({
+    type: 'FeatureCollection',
+    features: objects
+  });
+};
+
+
+/**
+ * Encode a geometry as a GeoJSON string.
+ *
+ * @function
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {string} GeoJSON.
+ * @api stable
+ */
+ol.format.GeoJSON.prototype.writeGeometry;
+
+
+/**
+ * Encode a geometry as a GeoJSON object.
+ *
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {GeoJSONGeometry|GeoJSONGeometryCollection} Object.
+ * @api stable
+ */
+ol.format.GeoJSON.prototype.writeGeometryObject = function(geometry,
+    opt_options) {
+  return ol.format.GeoJSON.writeGeometry_(geometry,
+      this.adaptOptions(opt_options));
+};
+
+goog.provide('ol.format.XMLFeature');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.dom.NodeType');
+goog.require('goog.dom.xml');
+goog.require('ol.format.Feature');
+goog.require('ol.format.FormatType');
+goog.require('ol.proj');
+goog.require('ol.xml');
+
+
+
+/**
+ * @classdesc
+ * Abstract base class; normally only used for creating subclasses and not
+ * instantiated in apps.
+ * Base class for XML feature formats.
+ *
+ * @constructor
+ * @extends {ol.format.Feature}
+ */
+ol.format.XMLFeature = function() {
+  goog.base(this);
+};
+goog.inherits(ol.format.XMLFeature, ol.format.Feature);
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.XMLFeature.prototype.getType = function() {
+  return ol.format.FormatType.XML;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.XMLFeature.prototype.readFeature = function(source, opt_options) {
+  if (ol.xml.isDocument(source)) {
+    return this.readFeatureFromDocument(
+        /** @type {Document} */ (source), opt_options);
+  } else if (ol.xml.isNode(source)) {
+    return this.readFeatureFromNode(/** @type {Node} */ (source), opt_options);
+  } else if (goog.isString(source)) {
+    var doc = ol.xml.parse(source);
+    return this.readFeatureFromDocument(doc, opt_options);
+  } else {
+    goog.asserts.fail('Unknown source type');
+    return null;
+  }
+};
+
+
+/**
+ * @param {Document} doc Document.
+ * @param {olx.format.ReadOptions=} opt_options Options.
+ * @return {ol.Feature} Feature.
+ */
+ol.format.XMLFeature.prototype.readFeatureFromDocument = function(
+    doc, opt_options) {
+  var features = this.readFeaturesFromDocument(doc, opt_options);
+  if (features.length > 0) {
+    return features[0];
+  } else {
+    return null;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {olx.format.ReadOptions=} opt_options Options.
+ * @return {ol.Feature} Feature.
+ */
+ol.format.XMLFeature.prototype.readFeatureFromNode = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.XMLFeature.prototype.readFeatures = function(source, opt_options) {
+  if (ol.xml.isDocument(source)) {
+    return this.readFeaturesFromDocument(
+        /** @type {Document} */ (source), opt_options);
+  } else if (ol.xml.isNode(source)) {
+    return this.readFeaturesFromNode(/** @type {Node} */ (source), opt_options);
+  } else if (goog.isString(source)) {
+    var doc = ol.xml.parse(source);
+    return this.readFeaturesFromDocument(doc, opt_options);
+  } else {
+    goog.asserts.fail('Unknown source type');
+    return [];
+  }
+};
+
+
+/**
+ * @param {Document} doc Document.
+ * @param {olx.format.ReadOptions=} opt_options Options.
+ * @protected
+ * @return {Array.<ol.Feature>} Features.
+ */
+ol.format.XMLFeature.prototype.readFeaturesFromDocument = function(
+    doc, opt_options) {
+  /** @type {Array.<ol.Feature>} */
+  var features = [];
+  var n;
+  for (n = doc.firstChild; n; n = n.nextSibling) {
+    if (n.nodeType == goog.dom.NodeType.ELEMENT) {
+      goog.array.extend(features, this.readFeaturesFromNode(n, opt_options));
+    }
+  }
+  return features;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {olx.format.ReadOptions=} opt_options Options.
+ * @protected
+ * @return {Array.<ol.Feature>} Features.
+ */
+ol.format.XMLFeature.prototype.readFeaturesFromNode = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.XMLFeature.prototype.readGeometry = function(source, opt_options) {
+  if (ol.xml.isDocument(source)) {
+    return this.readGeometryFromDocument(
+        /** @type {Document} */ (source), opt_options);
+  } else if (ol.xml.isNode(source)) {
+    return this.readGeometryFromNode(/** @type {Node} */ (source), opt_options);
+  } else if (goog.isString(source)) {
+    var doc = ol.xml.parse(source);
+    return this.readGeometryFromDocument(doc, opt_options);
+  } else {
+    goog.asserts.fail('Unknown source type');
+    return null;
+  }
+};
+
+
+/**
+ * @param {Document} doc Document.
+ * @param {olx.format.ReadOptions=} opt_options Options.
+ * @protected
+ * @return {ol.geom.Geometry} Geometry.
+ */
+ol.format.XMLFeature.prototype.readGeometryFromDocument = goog.abstractMethod;
+
+
+/**
+ * @param {Node} node Node.
+ * @param {olx.format.ReadOptions=} opt_options Options.
+ * @protected
+ * @return {ol.geom.Geometry} Geometry.
+ */
+ol.format.XMLFeature.prototype.readGeometryFromNode = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.XMLFeature.prototype.readProjection = function(source) {
+  if (ol.xml.isDocument(source)) {
+    return this.readProjectionFromDocument(/** @type {Document} */ (source));
+  } else if (ol.xml.isNode(source)) {
+    return this.readProjectionFromNode(/** @type {Node} */ (source));
+  } else if (goog.isString(source)) {
+    var doc = ol.xml.parse(source);
+    return this.readProjectionFromDocument(doc);
+  } else {
+    goog.asserts.fail('Unknown source type');
+    return null;
+  }
+};
+
+
+/**
+ * @param {Document} doc Document.
+ * @protected
+ * @return {ol.proj.Projection} Projection.
+ */
+ol.format.XMLFeature.prototype.readProjectionFromDocument = function(doc) {
+  return this.defaultDataProjection;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @protected
+ * @return {ol.proj.Projection} Projection.
+ */
+ol.format.XMLFeature.prototype.readProjectionFromNode = function(node) {
+  return this.defaultDataProjection;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.XMLFeature.prototype.writeFeature = function(feature, opt_options) {
+  var node = this.writeFeatureNode(feature, opt_options);
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  return goog.dom.xml.serialize(/** @type {Element} */(node));
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature.
+ * @param {olx.format.WriteOptions=} opt_options Options.
+ * @protected
+ * @return {Node} Node.
+ */
+ol.format.XMLFeature.prototype.writeFeatureNode = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.XMLFeature.prototype.writeFeatures = function(features, opt_options) {
+  var node = this.writeFeaturesNode(features, opt_options);
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  return goog.dom.xml.serialize(/** @type {Element} */(node));
+};
+
+
+/**
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {olx.format.WriteOptions=} opt_options Options.
+ * @return {Node} Node.
+ */
+ol.format.XMLFeature.prototype.writeFeaturesNode = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.XMLFeature.prototype.writeGeometry = function(geometry, opt_options) {
+  var node = this.writeGeometryNode(geometry, opt_options);
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  return goog.dom.xml.serialize(/** @type {Element} */(node));
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Options.
+ * @return {Node} Node.
+ */
+ol.format.XMLFeature.prototype.writeGeometryNode = goog.abstractMethod;
+
+// FIXME Envelopes should not be treated as geometries! readEnvelope_ is part
+// of GEOMETRY_PARSERS_ and methods using GEOMETRY_PARSERS_ do not expect
+// envelopes/extents, only geometries!
+goog.provide('ol.format.GMLBase');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.dom.NodeType');
+goog.require('goog.object');
+goog.require('goog.string');
+goog.require('ol.Feature');
+goog.require('ol.format.Feature');
+goog.require('ol.format.XMLFeature');
+goog.require('ol.geom.Geometry');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.LinearRing');
+goog.require('ol.geom.MultiLineString');
+goog.require('ol.geom.MultiPoint');
+goog.require('ol.geom.MultiPolygon');
+goog.require('ol.geom.Point');
+goog.require('ol.geom.Polygon');
+goog.require('ol.proj');
+goog.require('ol.xml');
+
+
+
+/**
+ * @classdesc
+ * Abstract base class; normally only used for creating subclasses and not
+ * instantiated in apps.
+ * Feature base format for reading and writing data in the GML format.
+ * This class cannot be instantiated, it contains only base content that
+ * is shared with versioned format classes ol.format.GML2 and
+ * ol.format.GML3.
+ *
+ * @constructor
+ * @param {olx.format.GMLOptions=} opt_options
+ *     Optional configuration object.
+ * @extends {ol.format.XMLFeature}
+ */
+ol.format.GMLBase = function(opt_options) {
+  var options = /** @type {olx.format.GMLOptions} */
+      (opt_options ? opt_options : {});
+
+  /**
+   * @protected
+   * @type {Array.<string>|string|undefined}
+   */
+  this.featureType = options.featureType;
+
+  /**
+   * @protected
+   * @type {Object.<string, string>|string|undefined}
+   */
+  this.featureNS = options.featureNS;
+
+  /**
+   * @protected
+   * @type {string}
+   */
+  this.srsName = options.srsName;
+
+  /**
+   * @protected
+   * @type {string}
+   */
+  this.schemaLocation = '';
+
+  /**
+   * @type {Object.<string, Object.<string, Object>>}
+   */
+  this.FEATURE_COLLECTION_PARSERS = {};
+  this.FEATURE_COLLECTION_PARSERS[ol.format.GMLBase.GMLNS] = {
+    'featureMember': ol.xml.makeReplacer(
+        ol.format.GMLBase.prototype.readFeaturesInternal),
+    'featureMembers': ol.xml.makeReplacer(
+        ol.format.GMLBase.prototype.readFeaturesInternal)
+  };
+
+  goog.base(this);
+};
+goog.inherits(ol.format.GMLBase, ol.format.XMLFeature);
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.format.GMLBase.GMLNS = 'http://www.opengis.net/gml';
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Array.<ol.Feature>} Features.
+ */
+ol.format.GMLBase.prototype.readFeaturesInternal = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  var localName = ol.xml.getLocalName(node);
+  var features;
+  if (localName == 'FeatureCollection') {
+    if (node.namespaceURI === 'http://www.opengis.net/wfs') {
+      features = ol.xml.pushParseAndPop([],
+          this.FEATURE_COLLECTION_PARSERS, node,
+          objectStack, this);
+    } else {
+      features = ol.xml.pushParseAndPop(null,
+          this.FEATURE_COLLECTION_PARSERS, node,
+          objectStack, this);
+    }
+  } else if (localName == 'featureMembers' || localName == 'featureMember') {
+    var context = objectStack[0];
+    goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+    var featureType = context['featureType'];
+    var featureNS = context['featureNS'];
+    var i, ii, prefix = 'p', defaultPrefix = 'p0';
+    if (!featureType && node.childNodes) {
+      featureType = [], featureNS = {};
+      for (i = 0, ii = node.childNodes.length; i < ii; ++i) {
+        var child = node.childNodes[i];
+        if (child.nodeType === 1) {
+          var ft = child.nodeName.split(':').pop();
+          if (featureType.indexOf(ft) === -1) {
+            var key;
+            if (!goog.object.contains(featureNS, child.namespaceURI)) {
+              key = prefix + goog.object.getCount(featureNS);
+              featureNS[key] = child.namespaceURI;
+            } else {
+              key = goog.object.findKey(featureNS, function(value) {
+                return value === child.namespaceURI;
+              });
+            }
+            featureType.push(key + ':' + ft);
+          }
+        }
+      }
+      context['featureType'] = featureType;
+      context['featureNS'] = featureNS;
+    }
+    if (goog.isString(featureNS)) {
+      var ns = featureNS;
+      featureNS = {};
+      featureNS[defaultPrefix] = ns;
+    }
+    var parsersNS = {};
+    var featureTypes = goog.isArray(featureType) ? featureType : [featureType];
+    for (var p in featureNS) {
+      var parsers = {};
+      for (i = 0, ii = featureTypes.length; i < ii; ++i) {
+        var featurePrefix = featureTypes[i].indexOf(':') === -1 ?
+            defaultPrefix : featureTypes[i].split(':')[0];
+        if (featurePrefix === p) {
+          parsers[featureTypes[i].split(':').pop()] =
+              (localName == 'featureMembers') ?
+              ol.xml.makeArrayPusher(this.readFeatureElement, this) :
+              ol.xml.makeReplacer(this.readFeatureElement, this);
+        }
+      }
+      parsersNS[featureNS[p]] = parsers;
+    }
+    features = ol.xml.pushParseAndPop([], parsersNS, node, objectStack);
+  }
+  if (!features) {
+    features = [];
+  }
+  return features;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {ol.geom.Geometry|undefined} Geometry.
+ */
+ol.format.GMLBase.prototype.readGeometryElement = function(node, objectStack) {
+  var context = objectStack[0];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  context['srsName'] = node.firstElementChild.getAttribute('srsName');
+  var geometry = ol.xml.pushParseAndPop(/** @type {ol.geom.Geometry} */(null),
+      this.GEOMETRY_PARSERS_, node, objectStack, this);
+  if (geometry) {
+    return /** @type {ol.geom.Geometry} */ (
+        ol.format.Feature.transformWithOptions(geometry, false, context));
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {ol.Feature} Feature.
+ */
+ol.format.GMLBase.prototype.readFeatureElement = function(node, objectStack) {
+  var n;
+  var fid = node.getAttribute('fid') ||
+      ol.xml.getAttributeNS(node, ol.format.GMLBase.GMLNS, 'id');
+  var values = {}, geometryName;
+  for (n = node.firstElementChild; n; n = n.nextElementSibling) {
+    var localName = ol.xml.getLocalName(n);
+    // Assume attribute elements have one child node and that the child
+    // is a text or CDATA node (to be treated as text).
+    // Otherwise assume it is a geometry node.
+    if (n.childNodes.length === 0 ||
+        (n.childNodes.length === 1 &&
+        (n.firstChild.nodeType === 3 || n.firstChild.nodeType === 4))) {
+      var value = ol.xml.getAllTextContent(n, false);
+      if (goog.string.isEmpty(value)) {
+        value = undefined;
+      }
+      values[localName] = value;
+    } else {
+      // boundedBy is an extent and must not be considered as a geometry
+      if (localName !== 'boundedBy') {
+        geometryName = localName;
+      }
+      values[localName] = this.readGeometryElement(n, objectStack);
+    }
+  }
+  var feature = new ol.Feature(values);
+  if (geometryName) {
+    feature.setGeometryName(geometryName);
+  }
+  if (fid) {
+    feature.setId(fid);
+  }
+  return feature;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {ol.geom.Point|undefined} Point.
+ */
+ol.format.GMLBase.prototype.readPoint = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Point', 'localName should be Point');
+  var flatCoordinates =
+      this.readFlatCoordinatesFromNode_(node, objectStack);
+  if (flatCoordinates) {
+    var point = new ol.geom.Point(null);
+    goog.asserts.assert(flatCoordinates.length == 3,
+        'flatCoordinates should have a length of 3');
+    point.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates);
+    return point;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {ol.geom.MultiPoint|undefined} MultiPoint.
+ */
+ol.format.GMLBase.prototype.readMultiPoint = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'MultiPoint',
+      'localName should be MultiPoint');
+  var coordinates = ol.xml.pushParseAndPop(
+      /** @type {Array.<Array.<number>>} */ ([]),
+      this.MULTIPOINT_PARSERS_, node, objectStack, this);
+  if (coordinates) {
+    return new ol.geom.MultiPoint(coordinates);
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {ol.geom.MultiLineString|undefined} MultiLineString.
+ */
+ol.format.GMLBase.prototype.readMultiLineString = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'MultiLineString',
+      'localName should be MultiLineString');
+  var lineStrings = ol.xml.pushParseAndPop(
+      /** @type {Array.<ol.geom.LineString>} */ ([]),
+      this.MULTILINESTRING_PARSERS_, node, objectStack, this);
+  if (lineStrings) {
+    var multiLineString = new ol.geom.MultiLineString(null);
+    multiLineString.setLineStrings(lineStrings);
+    return multiLineString;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {ol.geom.MultiPolygon|undefined} MultiPolygon.
+ */
+ol.format.GMLBase.prototype.readMultiPolygon = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'MultiPolygon',
+      'localName should be MultiPolygon');
+  var polygons = ol.xml.pushParseAndPop(
+      /** @type {Array.<ol.geom.Polygon>} */ ([]),
+      this.MULTIPOLYGON_PARSERS_, node, objectStack, this);
+  if (polygons) {
+    var multiPolygon = new ol.geom.MultiPolygon(null);
+    multiPolygon.setPolygons(polygons);
+    return multiPolygon;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GMLBase.prototype.pointMemberParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'pointMember' ||
+      node.localName == 'pointMembers',
+      'localName should be pointMember or pointMembers');
+  ol.xml.parseNode(this.POINTMEMBER_PARSERS_,
+      node, objectStack, this);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GMLBase.prototype.lineStringMemberParser_ =
+    function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'lineStringMember' ||
+      node.localName == 'lineStringMembers',
+      'localName should be LineStringMember or LineStringMembers');
+  ol.xml.parseNode(this.LINESTRINGMEMBER_PARSERS_,
+      node, objectStack, this);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GMLBase.prototype.polygonMemberParser_ =
+    function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'polygonMember' ||
+      node.localName == 'polygonMembers',
+      'localName should be polygonMember or polygonMembers');
+  ol.xml.parseNode(this.POLYGONMEMBER_PARSERS_, node,
+      objectStack, this);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {ol.geom.LineString|undefined} LineString.
+ */
+ol.format.GMLBase.prototype.readLineString = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'LineString',
+      'localName should be LineString');
+  var flatCoordinates =
+      this.readFlatCoordinatesFromNode_(node, objectStack);
+  if (flatCoordinates) {
+    var lineString = new ol.geom.LineString(null);
+    lineString.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates);
+    return lineString;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Array.<number>|undefined} LinearRing flat coordinates.
+ */
+ol.format.GMLBase.prototype.readFlatLinearRing_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'LinearRing',
+      'localName should be LinearRing');
+  var ring = ol.xml.pushParseAndPop(/** @type {Array.<number>} */(null),
+      this.GEOMETRY_FLAT_COORDINATES_PARSERS_, node,
+      objectStack, this);
+  if (ring) {
+    return ring;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {ol.geom.LinearRing|undefined} LinearRing.
+ */
+ol.format.GMLBase.prototype.readLinearRing = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'LinearRing',
+      'localName should be LinearRing');
+  var flatCoordinates =
+      this.readFlatCoordinatesFromNode_(node, objectStack);
+  if (flatCoordinates) {
+    var ring = new ol.geom.LinearRing(null);
+    ring.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates);
+    return ring;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {ol.geom.Polygon|undefined} Polygon.
+ */
+ol.format.GMLBase.prototype.readPolygon = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Polygon',
+      'localName should be Polygon');
+  var flatLinearRings = ol.xml.pushParseAndPop(
+      /** @type {Array.<Array.<number>>} */ ([null]),
+      this.FLAT_LINEAR_RINGS_PARSERS_, node, objectStack, this);
+  if (flatLinearRings && flatLinearRings[0]) {
+    var polygon = new ol.geom.Polygon(null);
+    var flatCoordinates = flatLinearRings[0];
+    var ends = [flatCoordinates.length];
+    var i, ii;
+    for (i = 1, ii = flatLinearRings.length; i < ii; ++i) {
+      goog.array.extend(flatCoordinates, flatLinearRings[i]);
+      ends.push(flatCoordinates.length);
+    }
+    polygon.setFlatCoordinates(
+        ol.geom.GeometryLayout.XYZ, flatCoordinates, ends);
+    return polygon;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Array.<number>} Flat coordinates.
+ */
+ol.format.GMLBase.prototype.readFlatCoordinatesFromNode_ =
+    function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  return /** @type {Array.<number>} */ (ol.xml.pushParseAndPop(
+      null,
+      this.GEOMETRY_FLAT_COORDINATES_PARSERS_, node,
+      objectStack, this));
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GMLBase.prototype.MULTIPOINT_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'pointMember': ol.xml.makeArrayPusher(
+        ol.format.GMLBase.prototype.pointMemberParser_),
+    'pointMembers': ol.xml.makeArrayPusher(
+        ol.format.GMLBase.prototype.pointMemberParser_)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GMLBase.prototype.MULTILINESTRING_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'lineStringMember': ol.xml.makeArrayPusher(
+        ol.format.GMLBase.prototype.lineStringMemberParser_),
+    'lineStringMembers': ol.xml.makeArrayPusher(
+        ol.format.GMLBase.prototype.lineStringMemberParser_)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GMLBase.prototype.MULTIPOLYGON_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'polygonMember': ol.xml.makeArrayPusher(
+        ol.format.GMLBase.prototype.polygonMemberParser_),
+    'polygonMembers': ol.xml.makeArrayPusher(
+        ol.format.GMLBase.prototype.polygonMemberParser_)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GMLBase.prototype.POINTMEMBER_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'Point': ol.xml.makeArrayPusher(
+        ol.format.GMLBase.prototype.readFlatCoordinatesFromNode_)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GMLBase.prototype.LINESTRINGMEMBER_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'LineString': ol.xml.makeArrayPusher(
+        ol.format.GMLBase.prototype.readLineString)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GMLBase.prototype.POLYGONMEMBER_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'Polygon': ol.xml.makeArrayPusher(
+        ol.format.GMLBase.prototype.readPolygon)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @protected
+ */
+ol.format.GMLBase.prototype.RING_PARSERS = Object({
+  'http://www.opengis.net/gml' : {
+    'LinearRing': ol.xml.makeReplacer(
+        ol.format.GMLBase.prototype.readFlatLinearRing_)
+  }
+});
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.GMLBase.prototype.readGeometryFromNode =
+    function(node, opt_options) {
+  var geometry = this.readGeometryElement(node,
+      [this.getReadOptions(node, opt_options ? opt_options : {})]);
+  return geometry ? geometry : null;
+};
+
+
+/**
+ * Read all features from a GML FeatureCollection.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Options.
+ * @return {Array.<ol.Feature>} Features.
+ * @api stable
+ */
+ol.format.GMLBase.prototype.readFeatures;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.GMLBase.prototype.readFeaturesFromNode =
+    function(node, opt_options) {
+  var options = {
+    featureType: this.featureType,
+    featureNS: this.featureNS
+  };
+  if (opt_options) {
+    goog.object.extend(options, this.getReadOptions(node, opt_options));
+  }
+  return this.readFeaturesInternal(node, [options]);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.GMLBase.prototype.readProjectionFromNode = function(node) {
+  return ol.proj.get(this.srsName_ ? this.srsName_ :
+      node.firstElementChild.getAttribute('srsName'));
+};
+
+goog.provide('ol.format.XSD');
+
+goog.require('goog.asserts');
+goog.require('goog.string');
+goog.require('ol');
+goog.require('ol.xml');
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.format.XSD.NAMESPACE_URI = 'http://www.w3.org/2001/XMLSchema';
+
+
+/**
+ * @param {Node} node Node.
+ * @return {boolean|undefined} Boolean.
+ */
+ol.format.XSD.readBoolean = function(node) {
+  var s = ol.xml.getAllTextContent(node, false);
+  return ol.format.XSD.readBooleanString(s);
+};
+
+
+/**
+ * @param {string} string String.
+ * @return {boolean|undefined} Boolean.
+ */
+ol.format.XSD.readBooleanString = function(string) {
+  var m = /^\s*(true|1)|(false|0)\s*$/.exec(string);
+  if (m) {
+    return m[1] !== undefined || false;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @return {number|undefined} DateTime in seconds.
+ */
+ol.format.XSD.readDateTime = function(node) {
+  var s = ol.xml.getAllTextContent(node, false);
+  var re =
+      /^\s*(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(Z|(?:([+\-])(\d{2})(?::(\d{2}))?))\s*$/;
+  var m = re.exec(s);
+  if (m) {
+    var year = parseInt(m[1], 10);
+    var month = parseInt(m[2], 10) - 1;
+    var day = parseInt(m[3], 10);
+    var hour = parseInt(m[4], 10);
+    var minute = parseInt(m[5], 10);
+    var second = parseInt(m[6], 10);
+    var dateTime = Date.UTC(year, month, day, hour, minute, second) / 1000;
+    if (m[7] != 'Z') {
+      var sign = m[8] == '-' ? -1 : 1;
+      dateTime += sign * 60 * parseInt(m[9], 10);
+      if (m[10] !== undefined) {
+        dateTime += sign * 60 * 60 * parseInt(m[10], 10);
+      }
+    }
+    return dateTime;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @return {number|undefined} Decimal.
+ */
+ol.format.XSD.readDecimal = function(node) {
+  var s = ol.xml.getAllTextContent(node, false);
+  return ol.format.XSD.readDecimalString(s);
+};
+
+
+/**
+ * @param {string} string String.
+ * @return {number|undefined} Decimal.
+ */
+ol.format.XSD.readDecimalString = function(string) {
+  // FIXME check spec
+  var m = /^\s*([+\-]?\d*\.?\d+(?:e[+\-]?\d+)?)\s*$/i.exec(string);
+  if (m) {
+    return parseFloat(m[1]);
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @return {number|undefined} Non negative integer.
+ */
+ol.format.XSD.readNonNegativeInteger = function(node) {
+  var s = ol.xml.getAllTextContent(node, false);
+  return ol.format.XSD.readNonNegativeIntegerString(s);
+};
+
+
+/**
+ * @param {string} string String.
+ * @return {number|undefined} Non negative integer.
+ */
+ol.format.XSD.readNonNegativeIntegerString = function(string) {
+  var m = /^\s*(\d+)\s*$/.exec(string);
+  if (m) {
+    return parseInt(m[1], 10);
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @return {string|undefined} String.
+ */
+ol.format.XSD.readString = function(node) {
+  return ol.xml.getAllTextContent(node, false).trim();
+};
+
+
+/**
+ * @param {Node} node Node to append a TextNode with the boolean to.
+ * @param {boolean} bool Boolean.
+ */
+ol.format.XSD.writeBooleanTextNode = function(node, bool) {
+  ol.format.XSD.writeStringTextNode(node, (bool) ? '1' : '0');
+};
+
+
+/**
+ * @param {Node} node Node to append a TextNode with the dateTime to.
+ * @param {number} dateTime DateTime in seconds.
+ */
+ol.format.XSD.writeDateTimeTextNode = function(node, dateTime) {
+  var date = new Date(dateTime * 1000);
+  var string = date.getUTCFullYear() + '-' +
+      goog.string.padNumber(date.getUTCMonth() + 1, 2) + '-' +
+      goog.string.padNumber(date.getUTCDate(), 2) + 'T' +
+      goog.string.padNumber(date.getUTCHours(), 2) + ':' +
+      goog.string.padNumber(date.getUTCMinutes(), 2) + ':' +
+      goog.string.padNumber(date.getUTCSeconds(), 2) + 'Z';
+  node.appendChild(ol.xml.DOCUMENT.createTextNode(string));
+};
+
+
+/**
+ * @param {Node} node Node to append a TextNode with the decimal to.
+ * @param {number} decimal Decimal.
+ */
+ol.format.XSD.writeDecimalTextNode = function(node, decimal) {
+  var string = decimal.toPrecision();
+  node.appendChild(ol.xml.DOCUMENT.createTextNode(string));
+};
+
+
+/**
+ * @param {Node} node Node to append a TextNode with the decimal to.
+ * @param {number} nonNegativeInteger Non negative integer.
+ */
+ol.format.XSD.writeNonNegativeIntegerTextNode =
+    function(node, nonNegativeInteger) {
+  goog.asserts.assert(nonNegativeInteger >= 0, 'value should be more than 0');
+  goog.asserts.assert(nonNegativeInteger == (nonNegativeInteger | 0),
+      'value should be an integer value');
+  var string = nonNegativeInteger.toString();
+  node.appendChild(ol.xml.DOCUMENT.createTextNode(string));
+};
+
+
+/**
+ * @param {Node} node Node to append a TextNode with the string to.
+ * @param {string} string String.
+ */
+ol.format.XSD.writeStringTextNode = function(node, string) {
+  node.appendChild(ol.xml.DOCUMENT.createTextNode(string));
+};
+
+goog.provide('ol.format.GML2');
+
+goog.require('goog.asserts');
+goog.require('goog.dom.NodeType');
+goog.require('ol.extent');
+goog.require('ol.format.GMLBase');
+goog.require('ol.format.XSD');
+goog.require('ol.proj');
+goog.require('ol.xml');
+
+
+
+/**
+ * @classdesc
+ * Feature format for reading and writing data in the GML format,
+ * version 2.1.2.
+ *
+ * @constructor
+ * @param {olx.format.GMLOptions=} opt_options Optional configuration object.
+ * @extends {ol.format.GMLBase}
+ * @api
+ */
+ol.format.GML2 = function(opt_options) {
+  var options = /** @type {olx.format.GMLOptions} */
+      (opt_options ? opt_options : {});
+
+  goog.base(this, options);
+
+  this.FEATURE_COLLECTION_PARSERS[ol.format.GMLBase.GMLNS][
+      'featureMember'] =
+      ol.xml.makeArrayPusher(ol.format.GMLBase.prototype.readFeaturesInternal);
+
+  /**
+   * @inheritDoc
+   */
+  this.schemaLocation = options.schemaLocation ?
+      options.schemaLocation : ol.format.GML2.schemaLocation_;
+
+};
+goog.inherits(ol.format.GML2, ol.format.GMLBase);
+
+
+/**
+ * @const
+ * @type {string}
+ * @private
+ */
+ol.format.GML2.schemaLocation_ = ol.format.GMLBase.GMLNS +
+    ' http://schemas.opengis.net/gml/2.1.2/feature.xsd';
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Array.<number>|undefined} Flat coordinates.
+ */
+ol.format.GML2.prototype.readFlatCoordinates_ = function(node, objectStack) {
+  var s = ol.xml.getAllTextContent(node, false).replace(/^\s*|\s*$/g, '');
+  var context = objectStack[0];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var containerSrs = context['srsName'];
+  var containerDimension = node.parentNode.getAttribute('srsDimension');
+  var axisOrientation = 'enu';
+  if (containerSrs) {
+    var proj = ol.proj.get(containerSrs);
+    if (proj) {
+      axisOrientation = proj.getAxisOrientation();
+    }
+  }
+  var coords = s.split(/[\s,]+/);
+  // The "dimension" attribute is from the GML 3.0.1 spec.
+  var dim = 2;
+  if (node.getAttribute('srsDimension')) {
+    dim = ol.format.XSD.readNonNegativeIntegerString(
+        node.getAttribute('srsDimension'));
+  } else if (node.getAttribute('dimension')) {
+    dim = ol.format.XSD.readNonNegativeIntegerString(
+        node.getAttribute('dimension'));
+  } else if (containerDimension) {
+    dim = ol.format.XSD.readNonNegativeIntegerString(containerDimension);
+  }
+  var x, y, z;
+  var flatCoordinates = [];
+  for (var i = 0, ii = coords.length; i < ii; i += dim) {
+    x = parseFloat(coords[i]);
+    y = parseFloat(coords[i + 1]);
+    z = (dim === 3) ? parseFloat(coords[i + 2]) : 0;
+    if (axisOrientation.substr(0, 2) === 'en') {
+      flatCoordinates.push(x, y, z);
+    } else {
+      flatCoordinates.push(y, x, z);
+    }
+  }
+  return flatCoordinates;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.Extent|undefined} Envelope.
+ */
+ol.format.GML2.prototype.readBox_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Box', 'localName should be Box');
+  var flatCoordinates = ol.xml.pushParseAndPop(
+      /** @type {Array.<number>} */ ([null]),
+      this.BOX_PARSERS_, node, objectStack, this);
+  return ol.extent.createOrUpdate(flatCoordinates[1][0],
+      flatCoordinates[1][1], flatCoordinates[1][3],
+      flatCoordinates[1][4]);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GML2.prototype.innerBoundaryIsParser_ =
+    function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'innerBoundaryIs',
+      'localName should be innerBoundaryIs');
+  var flatLinearRing = ol.xml.pushParseAndPop(
+      /** @type {Array.<number>|undefined} */ (undefined),
+      this.RING_PARSERS, node, objectStack, this);
+  if (flatLinearRing) {
+    var flatLinearRings = /** @type {Array.<Array.<number>>} */
+        (objectStack[objectStack.length - 1]);
+    goog.asserts.assert(goog.isArray(flatLinearRings),
+        'flatLinearRings should be an array');
+    goog.asserts.assert(flatLinearRings.length > 0,
+        'flatLinearRings should have an array length larger than 0');
+    flatLinearRings.push(flatLinearRing);
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GML2.prototype.outerBoundaryIsParser_ =
+    function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'outerBoundaryIs',
+      'localName should be outerBoundaryIs');
+  var flatLinearRing = ol.xml.pushParseAndPop(
+      /** @type {Array.<number>|undefined} */ (undefined),
+      this.RING_PARSERS, node, objectStack, this);
+  if (flatLinearRing) {
+    var flatLinearRings = /** @type {Array.<Array.<number>>} */
+        (objectStack[objectStack.length - 1]);
+    goog.asserts.assert(goog.isArray(flatLinearRings),
+        'flatLinearRings should be an array');
+    goog.asserts.assert(flatLinearRings.length > 0,
+        'flatLinearRings should have an array length larger than 0');
+    flatLinearRings[0] = flatLinearRing;
+  }
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GML2.prototype.GEOMETRY_FLAT_COORDINATES_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'coordinates': ol.xml.makeReplacer(
+        ol.format.GML2.prototype.readFlatCoordinates_)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GML2.prototype.FLAT_LINEAR_RINGS_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'innerBoundaryIs': ol.format.GML2.prototype.innerBoundaryIsParser_,
+    'outerBoundaryIs': ol.format.GML2.prototype.outerBoundaryIsParser_
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GML2.prototype.BOX_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'coordinates': ol.xml.makeArrayPusher(
+        ol.format.GML2.prototype.readFlatCoordinates_)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GML2.prototype.GEOMETRY_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'Point': ol.xml.makeReplacer(ol.format.GMLBase.prototype.readPoint),
+    'MultiPoint': ol.xml.makeReplacer(
+        ol.format.GMLBase.prototype.readMultiPoint),
+    'LineString': ol.xml.makeReplacer(
+        ol.format.GMLBase.prototype.readLineString),
+    'MultiLineString': ol.xml.makeReplacer(
+        ol.format.GMLBase.prototype.readMultiLineString),
+    'LinearRing' : ol.xml.makeReplacer(
+        ol.format.GMLBase.prototype.readLinearRing),
+    'Polygon': ol.xml.makeReplacer(ol.format.GMLBase.prototype.readPolygon),
+    'MultiPolygon': ol.xml.makeReplacer(
+        ol.format.GMLBase.prototype.readMultiPolygon),
+    'Box': ol.xml.makeReplacer(ol.format.GML2.prototype.readBox_)
+  }
+});
+
+goog.provide('ol.format.GML');
+goog.provide('ol.format.GML3');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.dom.NodeType');
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.Feature');
+goog.require('ol.extent');
+goog.require('ol.format.Feature');
+goog.require('ol.format.GMLBase');
+goog.require('ol.format.XSD');
+goog.require('ol.geom.Geometry');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.LinearRing');
+goog.require('ol.geom.MultiLineString');
+goog.require('ol.geom.MultiPolygon');
+goog.require('ol.geom.Point');
+goog.require('ol.geom.Polygon');
+goog.require('ol.proj');
+goog.require('ol.xml');
+
+
+
+/**
+ * @classdesc
+ * Feature format for reading and writing data in the GML format
+ * version 3.1.1.
+ * Currently only supports GML 3.1.1 Simple Features profile.
+ *
+ * @constructor
+ * @param {olx.format.GMLOptions=} opt_options
+ *     Optional configuration object.
+ * @extends {ol.format.GMLBase}
+ * @api
+ */
+ol.format.GML3 = function(opt_options) {
+  var options = /** @type {olx.format.GMLOptions} */
+      (opt_options ? opt_options : {});
+
+  goog.base(this, options);
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.surface_ = options.surface !== undefined ? options.surface : false;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.curve_ = options.curve !== undefined ? options.curve : false;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.multiCurve_ = options.multiCurve !== undefined ?
+      options.multiCurve : true;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.multiSurface_ = options.multiSurface !== undefined ?
+      options.multiSurface : true;
+
+  /**
+   * @inheritDoc
+   */
+  this.schemaLocation = options.schemaLocation ?
+      options.schemaLocation : ol.format.GML3.schemaLocation_;
+
+};
+goog.inherits(ol.format.GML3, ol.format.GMLBase);
+
+
+/**
+ * @const
+ * @type {string}
+ * @private
+ */
+ol.format.GML3.schemaLocation_ = ol.format.GMLBase.GMLNS +
+    ' http://schemas.opengis.net/gml/3.1.1/profiles/gmlsfProfile/' +
+    '1.0.0/gmlsf.xsd';
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.geom.MultiLineString|undefined} MultiLineString.
+ */
+ol.format.GML3.prototype.readMultiCurve_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'MultiCurve',
+      'localName should be MultiCurve');
+  var lineStrings = ol.xml.pushParseAndPop(
+      /** @type {Array.<ol.geom.LineString>} */ ([]),
+      this.MULTICURVE_PARSERS_, node, objectStack, this);
+  if (lineStrings) {
+    var multiLineString = new ol.geom.MultiLineString(null);
+    multiLineString.setLineStrings(lineStrings);
+    return multiLineString;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.geom.MultiPolygon|undefined} MultiPolygon.
+ */
+ol.format.GML3.prototype.readMultiSurface_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'MultiSurface',
+      'localName should be MultiSurface');
+  var polygons = ol.xml.pushParseAndPop(
+      /** @type {Array.<ol.geom.Polygon>} */ ([]),
+      this.MULTISURFACE_PARSERS_, node, objectStack, this);
+  if (polygons) {
+    var multiPolygon = new ol.geom.MultiPolygon(null);
+    multiPolygon.setPolygons(polygons);
+    return multiPolygon;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GML3.prototype.curveMemberParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'curveMember' ||
+      node.localName == 'curveMembers',
+      'localName should be curveMember or curveMembers');
+  ol.xml.parseNode(this.CURVEMEMBER_PARSERS_, node, objectStack, this);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GML3.prototype.surfaceMemberParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'surfaceMember' ||
+      node.localName == 'surfaceMembers',
+      'localName should be surfaceMember or surfaceMembers');
+  ol.xml.parseNode(this.SURFACEMEMBER_PARSERS_,
+      node, objectStack, this);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Array.<(Array.<number>)>|undefined} flat coordinates.
+ */
+ol.format.GML3.prototype.readPatch_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'patches',
+      'localName should be patches');
+  return ol.xml.pushParseAndPop(
+      /** @type {Array.<Array.<number>>} */ ([null]),
+      this.PATCHES_PARSERS_, node, objectStack, this);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Array.<number>|undefined} flat coordinates.
+ */
+ol.format.GML3.prototype.readSegment_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'segments',
+      'localName should be segments');
+  return ol.xml.pushParseAndPop(
+      /** @type {Array.<number>} */ ([null]),
+      this.SEGMENTS_PARSERS_, node, objectStack, this);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Array.<(Array.<number>)>|undefined} flat coordinates.
+ */
+ol.format.GML3.prototype.readPolygonPatch_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'npde.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'PolygonPatch',
+      'localName should be PolygonPatch');
+  return ol.xml.pushParseAndPop(
+      /** @type {Array.<Array.<number>>} */ ([null]),
+      this.FLAT_LINEAR_RINGS_PARSERS_, node, objectStack, this);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Array.<number>|undefined} flat coordinates.
+ */
+ol.format.GML3.prototype.readLineStringSegment_ =
+    function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'LineStringSegment',
+      'localName should be LineStringSegment');
+  return ol.xml.pushParseAndPop(
+      /** @type {Array.<number>} */ ([null]),
+      this.GEOMETRY_FLAT_COORDINATES_PARSERS_,
+      node, objectStack, this);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GML3.prototype.interiorParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'interior',
+      'localName should be interior');
+  var flatLinearRing = ol.xml.pushParseAndPop(
+      /** @type {Array.<number>|undefined} */ (undefined),
+      this.RING_PARSERS, node, objectStack, this);
+  if (flatLinearRing) {
+    var flatLinearRings = /** @type {Array.<Array.<number>>} */
+        (objectStack[objectStack.length - 1]);
+    goog.asserts.assert(goog.isArray(flatLinearRings),
+        'flatLinearRings should be an array');
+    goog.asserts.assert(flatLinearRings.length > 0,
+        'flatLinearRings should have an array length of 1 or more');
+    flatLinearRings.push(flatLinearRing);
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GML3.prototype.exteriorParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'exterior',
+      'localName should be exterior');
+  var flatLinearRing = ol.xml.pushParseAndPop(
+      /** @type {Array.<number>|undefined} */ (undefined),
+      this.RING_PARSERS, node, objectStack, this);
+  if (flatLinearRing) {
+    var flatLinearRings = /** @type {Array.<Array.<number>>} */
+        (objectStack[objectStack.length - 1]);
+    goog.asserts.assert(goog.isArray(flatLinearRings),
+        'flatLinearRings should be an array');
+    goog.asserts.assert(flatLinearRings.length > 0,
+        'flatLinearRings should have an array length of 1 or more');
+    flatLinearRings[0] = flatLinearRing;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.geom.Polygon|undefined} Polygon.
+ */
+ol.format.GML3.prototype.readSurface_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Surface',
+      'localName should be Surface');
+  var flatLinearRings = ol.xml.pushParseAndPop(
+      /** @type {Array.<Array.<number>>} */ ([null]),
+      this.SURFACE_PARSERS_, node, objectStack, this);
+  if (flatLinearRings && flatLinearRings[0]) {
+    var polygon = new ol.geom.Polygon(null);
+    var flatCoordinates = flatLinearRings[0];
+    var ends = [flatCoordinates.length];
+    var i, ii;
+    for (i = 1, ii = flatLinearRings.length; i < ii; ++i) {
+      goog.array.extend(flatCoordinates, flatLinearRings[i]);
+      ends.push(flatCoordinates.length);
+    }
+    polygon.setFlatCoordinates(
+        ol.geom.GeometryLayout.XYZ, flatCoordinates, ends);
+    return polygon;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.geom.LineString|undefined} LineString.
+ */
+ol.format.GML3.prototype.readCurve_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Curve', 'localName should be Curve');
+  var flatCoordinates = ol.xml.pushParseAndPop(
+      /** @type {Array.<number>} */ ([null]),
+      this.CURVE_PARSERS_, node, objectStack, this);
+  if (flatCoordinates) {
+    var lineString = new ol.geom.LineString(null);
+    lineString.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates);
+    return lineString;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.Extent|undefined} Envelope.
+ */
+ol.format.GML3.prototype.readEnvelope_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Envelope',
+      'localName should be Envelope');
+  var flatCoordinates = ol.xml.pushParseAndPop(
+      /** @type {Array.<number>} */ ([null]),
+      this.ENVELOPE_PARSERS_, node, objectStack, this);
+  return ol.extent.createOrUpdate(flatCoordinates[1][0],
+      flatCoordinates[1][1], flatCoordinates[2][0],
+      flatCoordinates[2][1]);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Array.<number>|undefined} Flat coordinates.
+ */
+ol.format.GML3.prototype.readFlatPos_ = function(node, objectStack) {
+  var s = ol.xml.getAllTextContent(node, false);
+  var re = /^\s*([+\-]?\d*\.?\d+(?:[eE][+\-]?\d+)?)\s*/;
+  /** @type {Array.<number>} */
+  var flatCoordinates = [];
+  var m;
+  while ((m = re.exec(s))) {
+    flatCoordinates.push(parseFloat(m[1]));
+    s = s.substr(m[0].length);
+  }
+  if (s !== '') {
+    return undefined;
+  }
+  var context = objectStack[0];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var containerSrs = context['srsName'];
+  var axisOrientation = 'enu';
+  if (containerSrs) {
+    var proj = ol.proj.get(containerSrs);
+    axisOrientation = proj.getAxisOrientation();
+  }
+  if (axisOrientation === 'neu') {
+    var i, ii;
+    for (i = 0, ii = flatCoordinates.length; i < ii; i += 3) {
+      var y = flatCoordinates[i];
+      var x = flatCoordinates[i + 1];
+      flatCoordinates[i] = x;
+      flatCoordinates[i + 1] = y;
+    }
+  }
+  var len = flatCoordinates.length;
+  if (len == 2) {
+    flatCoordinates.push(0);
+  }
+  if (len === 0) {
+    return undefined;
+  }
+  return flatCoordinates;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Array.<number>|undefined} Flat coordinates.
+ */
+ol.format.GML3.prototype.readFlatPosList_ = function(node, objectStack) {
+  var s = ol.xml.getAllTextContent(node, false).replace(/^\s*|\s*$/g, '');
+  var context = objectStack[0];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var containerSrs = context['srsName'];
+  var containerDimension = node.parentNode.getAttribute('srsDimension');
+  var axisOrientation = 'enu';
+  if (containerSrs) {
+    var proj = ol.proj.get(containerSrs);
+    axisOrientation = proj.getAxisOrientation();
+  }
+  var coords = s.split(/\s+/);
+  // The "dimension" attribute is from the GML 3.0.1 spec.
+  var dim = 2;
+  if (node.getAttribute('srsDimension')) {
+    dim = ol.format.XSD.readNonNegativeIntegerString(
+        node.getAttribute('srsDimension'));
+  } else if (node.getAttribute('dimension')) {
+    dim = ol.format.XSD.readNonNegativeIntegerString(
+        node.getAttribute('dimension'));
+  } else if (containerDimension) {
+    dim = ol.format.XSD.readNonNegativeIntegerString(containerDimension);
+  }
+  var x, y, z;
+  var flatCoordinates = [];
+  for (var i = 0, ii = coords.length; i < ii; i += dim) {
+    x = parseFloat(coords[i]);
+    y = parseFloat(coords[i + 1]);
+    z = (dim === 3) ? parseFloat(coords[i + 2]) : 0;
+    if (axisOrientation.substr(0, 2) === 'en') {
+      flatCoordinates.push(x, y, z);
+    } else {
+      flatCoordinates.push(y, x, z);
+    }
+  }
+  return flatCoordinates;
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GML3.prototype.GEOMETRY_FLAT_COORDINATES_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'pos': ol.xml.makeReplacer(ol.format.GML3.prototype.readFlatPos_),
+    'posList': ol.xml.makeReplacer(ol.format.GML3.prototype.readFlatPosList_)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GML3.prototype.FLAT_LINEAR_RINGS_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'interior': ol.format.GML3.prototype.interiorParser_,
+    'exterior': ol.format.GML3.prototype.exteriorParser_
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GML3.prototype.GEOMETRY_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'Point': ol.xml.makeReplacer(ol.format.GMLBase.prototype.readPoint),
+    'MultiPoint': ol.xml.makeReplacer(
+        ol.format.GMLBase.prototype.readMultiPoint),
+    'LineString': ol.xml.makeReplacer(
+        ol.format.GMLBase.prototype.readLineString),
+    'MultiLineString': ol.xml.makeReplacer(
+        ol.format.GMLBase.prototype.readMultiLineString),
+    'LinearRing' : ol.xml.makeReplacer(
+        ol.format.GMLBase.prototype.readLinearRing),
+    'Polygon': ol.xml.makeReplacer(ol.format.GMLBase.prototype.readPolygon),
+    'MultiPolygon': ol.xml.makeReplacer(
+        ol.format.GMLBase.prototype.readMultiPolygon),
+    'Surface': ol.xml.makeReplacer(ol.format.GML3.prototype.readSurface_),
+    'MultiSurface': ol.xml.makeReplacer(
+        ol.format.GML3.prototype.readMultiSurface_),
+    'Curve': ol.xml.makeReplacer(ol.format.GML3.prototype.readCurve_),
+    'MultiCurve': ol.xml.makeReplacer(
+        ol.format.GML3.prototype.readMultiCurve_),
+    'Envelope': ol.xml.makeReplacer(ol.format.GML3.prototype.readEnvelope_)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GML3.prototype.MULTICURVE_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'curveMember': ol.xml.makeArrayPusher(
+        ol.format.GML3.prototype.curveMemberParser_),
+    'curveMembers': ol.xml.makeArrayPusher(
+        ol.format.GML3.prototype.curveMemberParser_)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GML3.prototype.MULTISURFACE_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'surfaceMember': ol.xml.makeArrayPusher(
+        ol.format.GML3.prototype.surfaceMemberParser_),
+    'surfaceMembers': ol.xml.makeArrayPusher(
+        ol.format.GML3.prototype.surfaceMemberParser_)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GML3.prototype.CURVEMEMBER_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'LineString': ol.xml.makeArrayPusher(
+        ol.format.GMLBase.prototype.readLineString),
+    'Curve': ol.xml.makeArrayPusher(ol.format.GML3.prototype.readCurve_)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GML3.prototype.SURFACEMEMBER_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'Polygon': ol.xml.makeArrayPusher(ol.format.GMLBase.prototype.readPolygon),
+    'Surface': ol.xml.makeArrayPusher(ol.format.GML3.prototype.readSurface_)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GML3.prototype.SURFACE_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'patches': ol.xml.makeReplacer(ol.format.GML3.prototype.readPatch_)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GML3.prototype.CURVE_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'segments': ol.xml.makeReplacer(ol.format.GML3.prototype.readSegment_)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GML3.prototype.ENVELOPE_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'lowerCorner': ol.xml.makeArrayPusher(
+        ol.format.GML3.prototype.readFlatPosList_),
+    'upperCorner': ol.xml.makeArrayPusher(
+        ol.format.GML3.prototype.readFlatPosList_)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GML3.prototype.PATCHES_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'PolygonPatch': ol.xml.makeReplacer(
+        ol.format.GML3.prototype.readPolygonPatch_)
+  }
+});
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GML3.prototype.SEGMENTS_PARSERS_ = Object({
+  'http://www.opengis.net/gml' : {
+    'LineStringSegment': ol.xml.makeReplacer(
+        ol.format.GML3.prototype.readLineStringSegment_)
+  }
+});
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.Point} value Point geometry.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GML3.prototype.writePos_ = function(node, value, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var srsName = context['srsName'];
+  var axisOrientation = 'enu';
+  if (srsName) {
+    axisOrientation = ol.proj.get(srsName).getAxisOrientation();
+  }
+  var point = value.getCoordinates();
+  var coords;
+  // only 2d for simple features profile
+  if (axisOrientation.substr(0, 2) === 'en') {
+    coords = (point[0] + ' ' + point[1]);
+  } else {
+    coords = (point[1] + ' ' + point[0]);
+  }
+  ol.format.XSD.writeStringTextNode(node, coords);
+};
+
+
+/**
+ * @param {Array.<number>} point Point geometry.
+ * @param {string=} opt_srsName Optional srsName
+ * @return {string}
+ * @private
+ */
+ol.format.GML3.prototype.getCoords_ = function(point, opt_srsName) {
+  var axisOrientation = 'enu';
+  if (opt_srsName) {
+    axisOrientation = ol.proj.get(opt_srsName).getAxisOrientation();
+  }
+  return ((axisOrientation.substr(0, 2) === 'en') ?
+      point[0] + ' ' + point[1] :
+      point[1] + ' ' + point[0]);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.LineString|ol.geom.LinearRing} value Geometry.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GML3.prototype.writePosList_ = function(node, value, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var srsName = context['srsName'];
+  // only 2d for simple features profile
+  var points = value.getCoordinates();
+  var len = points.length;
+  var parts = new Array(len);
+  var point;
+  for (var i = 0; i < len; ++i) {
+    point = points[i];
+    parts[i] = this.getCoords_(point, srsName);
+  }
+  ol.format.XSD.writeStringTextNode(node, parts.join(' '));
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.Point} geometry Point geometry.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GML3.prototype.writePoint_ = function(node, geometry, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var srsName = context['srsName'];
+  if (srsName) {
+    node.setAttribute('srsName', srsName);
+  }
+  var pos = ol.xml.createElementNS(node.namespaceURI, 'pos');
+  node.appendChild(pos);
+  this.writePos_(pos, geometry, objectStack);
+};
+
+
+/**
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.GML3.ENVELOPE_SERIALIZERS_ = {
+  'http://www.opengis.net/gml': {
+    'lowerCorner': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+    'upperCorner': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode)
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.Extent} extent Extent.
+ * @param {Array.<*>} objectStack Node stack.
+ */
+ol.format.GML3.prototype.writeEnvelope = function(node, extent, objectStack) {
+  goog.asserts.assert(extent.length == 4, 'extent should have 4 items');
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var srsName = context['srsName'];
+  if (srsName) {
+    node.setAttribute('srsName', srsName);
+  }
+  var keys = ['lowerCorner', 'upperCorner'];
+  var values = [extent[0] + ' ' + extent[1], extent[2] + ' ' + extent[3]];
+  ol.xml.pushSerializeAndPop(/** @type {ol.xml.NodeStackItem} */
+      ({node: node}), ol.format.GML3.ENVELOPE_SERIALIZERS_,
+      ol.xml.OBJECT_PROPERTY_NODE_FACTORY,
+      values,
+      objectStack, keys, this);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.LinearRing} geometry LinearRing geometry.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GML3.prototype.writeLinearRing_ =
+    function(node, geometry, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var srsName = context['srsName'];
+  if (srsName) {
+    node.setAttribute('srsName', srsName);
+  }
+  var posList = ol.xml.createElementNS(node.namespaceURI, 'posList');
+  node.appendChild(posList);
+  this.writePosList_(posList, geometry, objectStack);
+};
+
+
+/**
+ * @param {*} value Value.
+ * @param {Array.<*>} objectStack Object stack.
+ * @param {string=} opt_nodeName Node name.
+ * @return {Node} Node.
+ * @private
+ */
+ol.format.GML3.prototype.RING_NODE_FACTORY_ =
+    function(value, objectStack, opt_nodeName) {
+  var context = objectStack[objectStack.length - 1];
+  var parentNode = context.node;
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var exteriorWritten = context['exteriorWritten'];
+  if (exteriorWritten === undefined) {
+    context['exteriorWritten'] = true;
+  }
+  return ol.xml.createElementNS(parentNode.namespaceURI,
+      exteriorWritten !== undefined ? 'interior' : 'exterior');
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.Polygon} geometry Polygon geometry.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GML3.prototype.writeSurfaceOrPolygon_ =
+    function(node, geometry, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var srsName = context['srsName'];
+  if (node.nodeName !== 'PolygonPatch' && srsName) {
+    node.setAttribute('srsName', srsName);
+  }
+  if (node.nodeName === 'Polygon' || node.nodeName === 'PolygonPatch') {
+    var rings = geometry.getLinearRings();
+    ol.xml.pushSerializeAndPop(
+        {node: node, srsName: srsName},
+        ol.format.GML3.RING_SERIALIZERS_,
+        this.RING_NODE_FACTORY_,
+        rings, objectStack, undefined, this);
+  } else if (node.nodeName === 'Surface') {
+    var patches = ol.xml.createElementNS(node.namespaceURI, 'patches');
+    node.appendChild(patches);
+    this.writeSurfacePatches_(
+        patches, geometry, objectStack);
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.LineString} geometry LineString geometry.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GML3.prototype.writeCurveOrLineString_ =
+    function(node, geometry, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var srsName = context['srsName'];
+  if (node.nodeName !== 'LineStringSegment' && srsName) {
+    node.setAttribute('srsName', srsName);
+  }
+  if (node.nodeName === 'LineString' ||
+      node.nodeName === 'LineStringSegment') {
+    var posList = ol.xml.createElementNS(node.namespaceURI, 'posList');
+    node.appendChild(posList);
+    this.writePosList_(posList, geometry, objectStack);
+  } else if (node.nodeName === 'Curve') {
+    var segments = ol.xml.createElementNS(node.namespaceURI, 'segments');
+    node.appendChild(segments);
+    this.writeCurveSegments_(segments,
+        geometry, objectStack);
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.MultiPolygon} geometry MultiPolygon geometry.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GML3.prototype.writeMultiSurfaceOrPolygon_ =
+    function(node, geometry, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var srsName = context['srsName'];
+  var surface = context['surface'];
+  if (srsName) {
+    node.setAttribute('srsName', srsName);
+  }
+  var polygons = geometry.getPolygons();
+  ol.xml.pushSerializeAndPop({node: node, srsName: srsName, surface: surface},
+      ol.format.GML3.SURFACEORPOLYGONMEMBER_SERIALIZERS_,
+      this.MULTIGEOMETRY_MEMBER_NODE_FACTORY_, polygons,
+      objectStack, undefined, this);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.MultiPoint} geometry MultiPoint geometry.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GML3.prototype.writeMultiPoint_ = function(node, geometry,
+    objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var srsName = context['srsName'];
+  if (srsName) {
+    node.setAttribute('srsName', srsName);
+  }
+  var points = geometry.getPoints();
+  ol.xml.pushSerializeAndPop({node: node, srsName: srsName},
+      ol.format.GML3.POINTMEMBER_SERIALIZERS_,
+      ol.xml.makeSimpleNodeFactory('pointMember'), points,
+      objectStack, undefined, this);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.MultiLineString} geometry MultiLineString geometry.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GML3.prototype.writeMultiCurveOrLineString_ =
+    function(node, geometry, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var srsName = context['srsName'];
+  var curve = context['curve'];
+  if (srsName) {
+    node.setAttribute('srsName', srsName);
+  }
+  var lines = geometry.getLineStrings();
+  ol.xml.pushSerializeAndPop({node: node, srsName: srsName, curve: curve},
+      ol.format.GML3.LINESTRINGORCURVEMEMBER_SERIALIZERS_,
+      this.MULTIGEOMETRY_MEMBER_NODE_FACTORY_, lines,
+      objectStack, undefined, this);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.LinearRing} ring LinearRing geometry.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GML3.prototype.writeRing_ = function(node, ring, objectStack) {
+  var linearRing = ol.xml.createElementNS(node.namespaceURI, 'LinearRing');
+  node.appendChild(linearRing);
+  this.writeLinearRing_(linearRing, ring, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.Polygon} polygon Polygon geometry.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GML3.prototype.writeSurfaceOrPolygonMember_ =
+    function(node, polygon, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var child = this.GEOMETRY_NODE_FACTORY_(
+      polygon, objectStack);
+  if (child) {
+    node.appendChild(child);
+    this.writeSurfaceOrPolygon_(child, polygon, objectStack);
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.Point} point Point geometry.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GML3.prototype.writePointMember_ =
+    function(node, point, objectStack) {
+  var child = ol.xml.createElementNS(node.namespaceURI, 'Point');
+  node.appendChild(child);
+  this.writePoint_(child, point, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.LineString} line LineString geometry.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GML3.prototype.writeLineStringOrCurveMember_ =
+    function(node, line, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var child = this.GEOMETRY_NODE_FACTORY_(line, objectStack);
+  if (child) {
+    node.appendChild(child);
+    this.writeCurveOrLineString_(child, line, objectStack);
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.Polygon} polygon Polygon geometry.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GML3.prototype.writeSurfacePatches_ =
+    function(node, polygon, objectStack) {
+  var child = ol.xml.createElementNS(node.namespaceURI, 'PolygonPatch');
+  node.appendChild(child);
+  this.writeSurfaceOrPolygon_(child, polygon, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.LineString} line LineString geometry.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GML3.prototype.writeCurveSegments_ =
+    function(node, line, objectStack) {
+  var child = ol.xml.createElementNS(node.namespaceURI,
+      'LineStringSegment');
+  node.appendChild(child);
+  this.writeCurveOrLineString_(child, line, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.Geometry|ol.Extent} geometry Geometry.
+ * @param {Array.<*>} objectStack Node stack.
+ */
+ol.format.GML3.prototype.writeGeometryElement =
+    function(node, geometry, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var item = goog.object.clone(context);
+  item.node = node;
+  var value;
+  if (goog.isArray(geometry)) {
+    if (context.dataProjection) {
+      value = ol.proj.transformExtent(
+          geometry, context.featureProjection, context.dataProjection);
+    } else {
+      value = geometry;
+    }
+  } else {
+    goog.asserts.assertInstanceof(geometry, ol.geom.Geometry,
+        'geometry should be an ol.geom.Geometry');
+    value =
+        ol.format.Feature.transformWithOptions(geometry, true, context);
+  }
+  ol.xml.pushSerializeAndPop(/** @type {ol.xml.NodeStackItem} */
+      (item), ol.format.GML3.GEOMETRY_SERIALIZERS_,
+      this.GEOMETRY_NODE_FACTORY_, [value],
+      objectStack, undefined, this);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.Feature} feature Feature.
+ * @param {Array.<*>} objectStack Node stack.
+ */
+ol.format.GML3.prototype.writeFeatureElement =
+    function(node, feature, objectStack) {
+  var fid = feature.getId();
+  if (fid) {
+    node.setAttribute('fid', fid);
+  }
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var featureNS = context['featureNS'];
+  var geometryName = feature.getGeometryName();
+  if (!context.serializers) {
+    context.serializers = {};
+    context.serializers[featureNS] = {};
+  }
+  var properties = feature.getProperties();
+  var keys = [], values = [];
+  for (var key in properties) {
+    var value = properties[key];
+    if (value !== null) {
+      keys.push(key);
+      values.push(value);
+      if (key == geometryName || value instanceof ol.geom.Geometry) {
+        if (!(key in context.serializers[featureNS])) {
+          context.serializers[featureNS][key] = ol.xml.makeChildAppender(
+              this.writeGeometryElement, this);
+        }
+      } else {
+        if (!(key in context.serializers[featureNS])) {
+          context.serializers[featureNS][key] = ol.xml.makeChildAppender(
+              ol.format.XSD.writeStringTextNode);
+        }
+      }
+    }
+  }
+  var item = goog.object.clone(context);
+  item.node = node;
+  ol.xml.pushSerializeAndPop(/** @type {ol.xml.NodeStackItem} */
+      (item), context.serializers,
+      ol.xml.makeSimpleNodeFactory(undefined, featureNS),
+      values,
+      objectStack, keys);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GML3.prototype.writeFeatureMembers_ =
+    function(node, features, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var featureType = context['featureType'];
+  var featureNS = context['featureNS'];
+  var serializers = {};
+  serializers[featureNS] = {};
+  serializers[featureNS][featureType] = ol.xml.makeChildAppender(
+      this.writeFeatureElement, this);
+  var item = goog.object.clone(context);
+  item.node = node;
+  ol.xml.pushSerializeAndPop(/** @type {ol.xml.NodeStackItem} */
+      (item),
+      serializers,
+      ol.xml.makeSimpleNodeFactory(featureType, featureNS), features,
+      objectStack);
+};
+
+
+/**
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.GML3.SURFACEORPOLYGONMEMBER_SERIALIZERS_ = {
+  'http://www.opengis.net/gml': {
+    'surfaceMember': ol.xml.makeChildAppender(
+        ol.format.GML3.prototype.writeSurfaceOrPolygonMember_),
+    'polygonMember': ol.xml.makeChildAppender(
+        ol.format.GML3.prototype.writeSurfaceOrPolygonMember_)
+  }
+};
+
+
+/**
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.GML3.POINTMEMBER_SERIALIZERS_ = {
+  'http://www.opengis.net/gml': {
+    'pointMember': ol.xml.makeChildAppender(
+        ol.format.GML3.prototype.writePointMember_)
+  }
+};
+
+
+/**
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.GML3.LINESTRINGORCURVEMEMBER_SERIALIZERS_ = {
+  'http://www.opengis.net/gml': {
+    'lineStringMember': ol.xml.makeChildAppender(
+        ol.format.GML3.prototype.writeLineStringOrCurveMember_),
+    'curveMember': ol.xml.makeChildAppender(
+        ol.format.GML3.prototype.writeLineStringOrCurveMember_)
+  }
+};
+
+
+/**
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.GML3.RING_SERIALIZERS_ = {
+  'http://www.opengis.net/gml': {
+    'exterior': ol.xml.makeChildAppender(ol.format.GML3.prototype.writeRing_),
+    'interior': ol.xml.makeChildAppender(ol.format.GML3.prototype.writeRing_)
+  }
+};
+
+
+/**
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.GML3.GEOMETRY_SERIALIZERS_ = {
+  'http://www.opengis.net/gml': {
+    'Curve': ol.xml.makeChildAppender(
+        ol.format.GML3.prototype.writeCurveOrLineString_),
+    'MultiCurve': ol.xml.makeChildAppender(
+        ol.format.GML3.prototype.writeMultiCurveOrLineString_),
+    'Point': ol.xml.makeChildAppender(ol.format.GML3.prototype.writePoint_),
+    'MultiPoint': ol.xml.makeChildAppender(
+        ol.format.GML3.prototype.writeMultiPoint_),
+    'LineString': ol.xml.makeChildAppender(
+        ol.format.GML3.prototype.writeCurveOrLineString_),
+    'MultiLineString': ol.xml.makeChildAppender(
+        ol.format.GML3.prototype.writeMultiCurveOrLineString_),
+    'LinearRing': ol.xml.makeChildAppender(
+        ol.format.GML3.prototype.writeLinearRing_),
+    'Polygon': ol.xml.makeChildAppender(
+        ol.format.GML3.prototype.writeSurfaceOrPolygon_),
+    'MultiPolygon': ol.xml.makeChildAppender(
+        ol.format.GML3.prototype.writeMultiSurfaceOrPolygon_),
+    'Surface': ol.xml.makeChildAppender(
+        ol.format.GML3.prototype.writeSurfaceOrPolygon_),
+    'MultiSurface': ol.xml.makeChildAppender(
+        ol.format.GML3.prototype.writeMultiSurfaceOrPolygon_),
+    'Envelope': ol.xml.makeChildAppender(
+        ol.format.GML3.prototype.writeEnvelope)
+  }
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, string>}
+ * @private
+ */
+ol.format.GML3.MULTIGEOMETRY_TO_MEMBER_NODENAME_ = {
+  'MultiLineString': 'lineStringMember',
+  'MultiCurve': 'curveMember',
+  'MultiPolygon': 'polygonMember',
+  'MultiSurface': 'surfaceMember'
+};
+
+
+/**
+ * @const
+ * @param {*} value Value.
+ * @param {Array.<*>} objectStack Object stack.
+ * @param {string=} opt_nodeName Node name.
+ * @return {Node|undefined} Node.
+ * @private
+ */
+ol.format.GML3.prototype.MULTIGEOMETRY_MEMBER_NODE_FACTORY_ =
+    function(value, objectStack, opt_nodeName) {
+  var parentNode = objectStack[objectStack.length - 1].node;
+  goog.asserts.assert(ol.xml.isNode(parentNode),
+      'parentNode should be a node');
+  return ol.xml.createElementNS('http://www.opengis.net/gml',
+      ol.format.GML3.MULTIGEOMETRY_TO_MEMBER_NODENAME_[parentNode.nodeName]);
+};
+
+
+/**
+ * @const
+ * @param {*} value Value.
+ * @param {Array.<*>} objectStack Object stack.
+ * @param {string=} opt_nodeName Node name.
+ * @return {Node|undefined} Node.
+ * @private
+ */
+ol.format.GML3.prototype.GEOMETRY_NODE_FACTORY_ =
+    function(value, objectStack, opt_nodeName) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var multiSurface = context['multiSurface'];
+  var surface = context['surface'];
+  var curve = context['curve'];
+  var multiCurve = context['multiCurve'];
+  var parentNode = objectStack[objectStack.length - 1].node;
+  goog.asserts.assert(ol.xml.isNode(parentNode),
+      'parentNode should be a node');
+  var nodeName;
+  if (!goog.isArray(value)) {
+    goog.asserts.assertInstanceof(value, ol.geom.Geometry,
+        'value should be an ol.geom.Geometry');
+    nodeName = value.getType();
+    if (nodeName === 'MultiPolygon' && multiSurface === true) {
+      nodeName = 'MultiSurface';
+    } else if (nodeName === 'Polygon' && surface === true) {
+      nodeName = 'Surface';
+    } else if (nodeName === 'LineString' && curve === true) {
+      nodeName = 'Curve';
+    } else if (nodeName === 'MultiLineString' && multiCurve === true) {
+      nodeName = 'MultiCurve';
+    }
+  } else {
+    nodeName = 'Envelope';
+  }
+  return ol.xml.createElementNS('http://www.opengis.net/gml',
+      nodeName);
+};
+
+
+/**
+ * Encode a geometry in GML 3.1.1 Simple Features.
+ *
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Options.
+ * @return {Node} Node.
+ * @api
+ */
+ol.format.GML3.prototype.writeGeometryNode = function(geometry, opt_options) {
+  opt_options = this.adaptOptions(opt_options);
+  var geom = ol.xml.createElementNS('http://www.opengis.net/gml', 'geom');
+  var context = {node: geom, srsName: this.srsName,
+    curve: this.curve_, surface: this.surface_,
+    multiSurface: this.multiSurface_, multiCurve: this.multiCurve_};
+  if (opt_options) {
+    goog.object.extend(context, opt_options);
+  }
+  this.writeGeometryElement(geom, geometry, [context]);
+  return geom;
+};
+
+
+/**
+ * Encode an array of features in GML 3.1.1 Simple Features.
+ *
+ * @function
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {olx.format.WriteOptions=} opt_options Options.
+ * @return {string} Result.
+ * @api stable
+ */
+ol.format.GML3.prototype.writeFeatures;
+
+
+/**
+ * Encode an array of features in the GML 3.1.1 format as an XML node.
+ *
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {olx.format.WriteOptions=} opt_options Options.
+ * @return {Node} Node.
+ * @api
+ */
+ol.format.GML3.prototype.writeFeaturesNode = function(features, opt_options) {
+  opt_options = this.adaptOptions(opt_options);
+  var node = ol.xml.createElementNS('http://www.opengis.net/gml',
+      'featureMembers');
+  ol.xml.setAttributeNS(node, 'http://www.w3.org/2001/XMLSchema-instance',
+      'xsi:schemaLocation', this.schemaLocation);
+  var context = {
+    srsName: this.srsName,
+    curve: this.curve_,
+    surface: this.surface_,
+    multiSurface: this.multiSurface_,
+    multiCurve: this.multiCurve_,
+    featureNS: this.featureNS,
+    featureType: this.featureType
+  };
+  if (opt_options) {
+    goog.object.extend(context, opt_options);
+  }
+  this.writeFeatureMembers_(node, features, [context]);
+  return node;
+};
+
+
+
+/**
+ * @classdesc
+ * Feature format for reading and writing data in the GML format
+ * version 3.1.1.
+ * Currently only supports GML 3.1.1 Simple Features profile.
+ *
+ * @constructor
+ * @param {olx.format.GMLOptions=} opt_options
+ *     Optional configuration object.
+ * @extends {ol.format.GMLBase}
+ * @api stable
+ */
+ol.format.GML = ol.format.GML3;
+
+
+/**
+ * Encode an array of features in GML 3.1.1 Simple Features.
+ *
+ * @function
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {olx.format.WriteOptions=} opt_options Options.
+ * @return {string} Result.
+ * @api stable
+ */
+ol.format.GML.prototype.writeFeatures;
+
+
+/**
+ * Encode an array of features in the GML 3.1.1 format as an XML node.
+ *
+ * @function
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {olx.format.WriteOptions=} opt_options Options.
+ * @return {Node} Node.
+ * @api
+ */
+ol.format.GML.prototype.writeFeaturesNode;
+
+goog.provide('ol.format.GPX');
+
+goog.require('goog.asserts');
+goog.require('goog.dom.NodeType');
+goog.require('ol.Feature');
+goog.require('ol.array');
+goog.require('ol.format.Feature');
+goog.require('ol.format.XMLFeature');
+goog.require('ol.format.XSD');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.MultiLineString');
+goog.require('ol.geom.Point');
+goog.require('ol.proj');
+goog.require('ol.xml');
+
+
+
+/**
+ * @classdesc
+ * Feature format for reading and writing data in the GPX format.
+ *
+ * @constructor
+ * @extends {ol.format.XMLFeature}
+ * @param {olx.format.GPXOptions=} opt_options Options.
+ * @api stable
+ */
+ol.format.GPX = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  goog.base(this);
+
+  /**
+   * @inheritDoc
+   */
+  this.defaultDataProjection = ol.proj.get('EPSG:4326');
+
+  /**
+   * @type {function(ol.Feature, Node)|undefined}
+   * @private
+   */
+  this.readExtensions_ = options.readExtensions;
+};
+goog.inherits(ol.format.GPX, ol.format.XMLFeature);
+
+
+/**
+ * @const
+ * @private
+ * @type {Array.<string>}
+ */
+ol.format.GPX.NAMESPACE_URIS_ = [
+  null,
+  'http://www.topografix.com/GPX/1/0',
+  'http://www.topografix.com/GPX/1/1'
+];
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {Node} node Node.
+ * @param {Object} values Values.
+ * @private
+ * @return {Array.<number>} Flat coordinates.
+ */
+ol.format.GPX.appendCoordinate_ = function(flatCoordinates, node, values) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  flatCoordinates.push(
+      parseFloat(node.getAttribute('lon')),
+      parseFloat(node.getAttribute('lat')));
+  if ('ele' in values) {
+    flatCoordinates.push(/** @type {number} */ (values['ele']));
+    delete values['ele'];
+  } else {
+    flatCoordinates.push(0);
+  }
+  if ('time' in values) {
+    flatCoordinates.push(/** @type {number} */ (values['time']));
+    delete values['time'];
+  } else {
+    flatCoordinates.push(0);
+  }
+  return flatCoordinates;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GPX.parseLink_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'link', 'localName should be link');
+  var values = /** @type {Object} */ (objectStack[objectStack.length - 1]);
+  var href = node.getAttribute('href');
+  if (href !== null) {
+    values['link'] = href;
+  }
+  ol.xml.parseNode(ol.format.GPX.LINK_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GPX.parseExtensions_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'extensions',
+      'localName should be extensions');
+  var values = /** @type {Object} */ (objectStack[objectStack.length - 1]);
+  values['extensionsNode_'] = node;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GPX.parseRtePt_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'rtept', 'localName should be rtept');
+  var values = ol.xml.pushParseAndPop(
+      {}, ol.format.GPX.RTEPT_PARSERS_, node, objectStack);
+  if (values) {
+    var rteValues = /** @type {Object} */ (objectStack[objectStack.length - 1]);
+    var flatCoordinates = /** @type {Array.<number>} */
+        (rteValues['flatCoordinates']);
+    ol.format.GPX.appendCoordinate_(flatCoordinates, node, values);
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GPX.parseTrkPt_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'trkpt', 'localName should be trkpt');
+  var values = ol.xml.pushParseAndPop(
+      {}, ol.format.GPX.TRKPT_PARSERS_, node, objectStack);
+  if (values) {
+    var trkValues = /** @type {Object} */ (objectStack[objectStack.length - 1]);
+    var flatCoordinates = /** @type {Array.<number>} */
+        (trkValues['flatCoordinates']);
+    ol.format.GPX.appendCoordinate_(flatCoordinates, node, values);
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GPX.parseTrkSeg_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'trkseg',
+      'localName should be trkseg');
+  var values = /** @type {Object} */ (objectStack[objectStack.length - 1]);
+  ol.xml.parseNode(ol.format.GPX.TRKSEG_PARSERS_, node, objectStack);
+  var flatCoordinates = /** @type {Array.<number>} */
+      (values['flatCoordinates']);
+  var ends = /** @type {Array.<number>} */ (values['ends']);
+  ends.push(flatCoordinates.length);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.Feature|undefined} Track.
+ */
+ol.format.GPX.readRte_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'rte', 'localName should be rte');
+  var options = /** @type {olx.format.ReadOptions} */ (objectStack[0]);
+  var values = ol.xml.pushParseAndPop({
+    'flatCoordinates': []
+  }, ol.format.GPX.RTE_PARSERS_, node, objectStack);
+  if (!values) {
+    return undefined;
+  }
+  var flatCoordinates = /** @type {Array.<number>} */
+      (values['flatCoordinates']);
+  delete values['flatCoordinates'];
+  var geometry = new ol.geom.LineString(null);
+  geometry.setFlatCoordinates(ol.geom.GeometryLayout.XYZM, flatCoordinates);
+  ol.format.Feature.transformWithOptions(geometry, false, options);
+  var feature = new ol.Feature(geometry);
+  feature.setProperties(values);
+  return feature;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.Feature|undefined} Track.
+ */
+ol.format.GPX.readTrk_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'trk', 'localName should be trk');
+  var options = /** @type {olx.format.ReadOptions} */ (objectStack[0]);
+  var values = ol.xml.pushParseAndPop({
+    'flatCoordinates': [],
+    'ends': []
+  }, ol.format.GPX.TRK_PARSERS_, node, objectStack);
+  if (!values) {
+    return undefined;
+  }
+  var flatCoordinates = /** @type {Array.<number>} */
+      (values['flatCoordinates']);
+  delete values['flatCoordinates'];
+  var ends = /** @type {Array.<number>} */ (values['ends']);
+  delete values['ends'];
+  var geometry = new ol.geom.MultiLineString(null);
+  geometry.setFlatCoordinates(
+      ol.geom.GeometryLayout.XYZM, flatCoordinates, ends);
+  ol.format.Feature.transformWithOptions(geometry, false, options);
+  var feature = new ol.Feature(geometry);
+  feature.setProperties(values);
+  return feature;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.Feature|undefined} Waypoint.
+ */
+ol.format.GPX.readWpt_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'wpt', 'localName should be wpt');
+  var options = /** @type {olx.format.ReadOptions} */ (objectStack[0]);
+  var values = ol.xml.pushParseAndPop(
+      {}, ol.format.GPX.WPT_PARSERS_, node, objectStack);
+  if (!values) {
+    return undefined;
+  }
+  var coordinates = ol.format.GPX.appendCoordinate_([], node, values);
+  var geometry = new ol.geom.Point(
+      coordinates, ol.geom.GeometryLayout.XYZM);
+  ol.format.Feature.transformWithOptions(geometry, false, options);
+  var feature = new ol.Feature(geometry);
+  feature.setProperties(values);
+  return feature;
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, function(Node, Array.<*>): (ol.Feature|undefined)>}
+ * @private
+ */
+ol.format.GPX.FEATURE_READER_ = {
+  'rte': ol.format.GPX.readRte_,
+  'trk': ol.format.GPX.readTrk_,
+  'wpt': ol.format.GPX.readWpt_
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GPX.GPX_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.GPX.NAMESPACE_URIS_, {
+      'rte': ol.xml.makeArrayPusher(ol.format.GPX.readRte_),
+      'trk': ol.xml.makeArrayPusher(ol.format.GPX.readTrk_),
+      'wpt': ol.xml.makeArrayPusher(ol.format.GPX.readWpt_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GPX.LINK_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.GPX.NAMESPACE_URIS_, {
+      'text':
+          ol.xml.makeObjectPropertySetter(ol.format.XSD.readString, 'linkText'),
+      'type':
+          ol.xml.makeObjectPropertySetter(ol.format.XSD.readString, 'linkType')
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GPX.RTE_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.GPX.NAMESPACE_URIS_, {
+      'name': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'cmt': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'desc': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'src': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'link': ol.format.GPX.parseLink_,
+      'number':
+          ol.xml.makeObjectPropertySetter(ol.format.XSD.readNonNegativeInteger),
+      'extensions': ol.format.GPX.parseExtensions_,
+      'type': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'rtept': ol.format.GPX.parseRtePt_
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GPX.RTEPT_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.GPX.NAMESPACE_URIS_, {
+      'ele': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
+      'time': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDateTime)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GPX.TRK_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.GPX.NAMESPACE_URIS_, {
+      'name': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'cmt': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'desc': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'src': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'link': ol.format.GPX.parseLink_,
+      'number':
+          ol.xml.makeObjectPropertySetter(ol.format.XSD.readNonNegativeInteger),
+      'type': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'extensions': ol.format.GPX.parseExtensions_,
+      'trkseg': ol.format.GPX.parseTrkSeg_
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GPX.TRKSEG_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.GPX.NAMESPACE_URIS_, {
+      'trkpt': ol.format.GPX.parseTrkPt_
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GPX.TRKPT_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.GPX.NAMESPACE_URIS_, {
+      'ele': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
+      'time': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDateTime)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.GPX.WPT_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.GPX.NAMESPACE_URIS_, {
+      'ele': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
+      'time': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDateTime),
+      'magvar': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
+      'geoidheight': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
+      'name': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'cmt': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'desc': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'src': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'link': ol.format.GPX.parseLink_,
+      'sym': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'type': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'fix': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'sat': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readNonNegativeInteger),
+      'hdop': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
+      'vdop': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
+      'pdop': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
+      'ageofdgpsdata':
+          ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
+      'dgpsid':
+          ol.xml.makeObjectPropertySetter(ol.format.XSD.readNonNegativeInteger),
+      'extensions': ol.format.GPX.parseExtensions_
+    });
+
+
+/**
+ * @param {Array.<ol.Feature>} features
+ * @private
+ */
+ol.format.GPX.prototype.handleReadExtensions_ = function(features) {
+  if (!features) {
+    features = [];
+  }
+  for (var i = 0, ii = features.length; i < ii; ++i) {
+    var feature = features[i];
+    if (this.readExtensions_) {
+      var extensionsNode = feature.get('extensionsNode_') || null;
+      this.readExtensions_(feature, extensionsNode);
+    }
+    feature.set('extensionsNode_', undefined);
+  }
+};
+
+
+/**
+ * Read the first feature from a GPX source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {ol.Feature} Feature.
+ * @api stable
+ */
+ol.format.GPX.prototype.readFeature;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.GPX.prototype.readFeatureFromNode = function(node, opt_options) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  if (!ol.array.includes(ol.format.GPX.NAMESPACE_URIS_, node.namespaceURI)) {
+    return null;
+  }
+  var featureReader = ol.format.GPX.FEATURE_READER_[node.localName];
+  if (!featureReader) {
+    return null;
+  }
+  var feature = featureReader(node, [this.getReadOptions(node, opt_options)]);
+  if (!feature) {
+    return null;
+  }
+  this.handleReadExtensions_([feature]);
+  return feature;
+};
+
+
+/**
+ * Read all features from a GPX source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {Array.<ol.Feature>} Features.
+ * @api stable
+ */
+ol.format.GPX.prototype.readFeatures;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.GPX.prototype.readFeaturesFromNode = function(node, opt_options) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  if (!ol.array.includes(ol.format.GPX.NAMESPACE_URIS_, node.namespaceURI)) {
+    return [];
+  }
+  if (node.localName == 'gpx') {
+    var features = ol.xml.pushParseAndPop(
+        /** @type {Array.<ol.Feature>} */ ([]), ol.format.GPX.GPX_PARSERS_,
+        node, [this.getReadOptions(node, opt_options)]);
+    if (features) {
+      this.handleReadExtensions_(features);
+      return features;
+    } else {
+      return [];
+    }
+  }
+  return [];
+};
+
+
+/**
+ * Read the projection from a GPX source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @return {ol.proj.Projection} Projection.
+ * @api stable
+ */
+ol.format.GPX.prototype.readProjection;
+
+
+/**
+ * @param {Node} node Node.
+ * @param {string} value Value for the link's `href` attribute.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.GPX.writeLink_ = function(node, value, objectStack) {
+  node.setAttribute('href', value);
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var properties = context['properties'];
+  var link = [
+    properties['linkText'],
+    properties['linkType']
+  ];
+  ol.xml.pushSerializeAndPop(/** @type {ol.xml.NodeStackItem} */ ({node: node}),
+      ol.format.GPX.LINK_SERIALIZERS_, ol.xml.OBJECT_PROPERTY_NODE_FACTORY,
+      link, objectStack, ol.format.GPX.LINK_SEQUENCE_);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GPX.writeWptType_ = function(node, coordinate, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var parentNode = context.node;
+  goog.asserts.assert(ol.xml.isNode(parentNode),
+      'parentNode should be an XML node');
+  var namespaceURI = parentNode.namespaceURI;
+  var properties = context['properties'];
+  //FIXME Projection handling
+  ol.xml.setAttributeNS(node, null, 'lat', coordinate[1]);
+  ol.xml.setAttributeNS(node, null, 'lon', coordinate[0]);
+  var geometryLayout = context['geometryLayout'];
+  /* jshint -W086 */
+  switch (geometryLayout) {
+    case ol.geom.GeometryLayout.XYZM:
+      if (coordinate[3] !== 0) {
+        properties['time'] = coordinate[3];
+      }
+    case ol.geom.GeometryLayout.XYZ:
+      if (coordinate[2] !== 0) {
+        properties['ele'] = coordinate[2];
+      }
+      break;
+    case ol.geom.GeometryLayout.XYM:
+      if (coordinate[2] !== 0) {
+        properties['time'] = coordinate[2];
+      }
+  }
+  /* jshint +W086 */
+  var orderedKeys = ol.format.GPX.WPT_TYPE_SEQUENCE_[namespaceURI];
+  var values = ol.xml.makeSequence(properties, orderedKeys);
+  ol.xml.pushSerializeAndPop(/** @type {ol.xml.NodeStackItem} */
+      ({node: node, 'properties': properties}),
+      ol.format.GPX.WPT_TYPE_SERIALIZERS_, ol.xml.OBJECT_PROPERTY_NODE_FACTORY,
+      values, objectStack, orderedKeys);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.Feature} feature Feature.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GPX.writeRte_ = function(node, feature, objectStack) {
+  var options = /** @type {olx.format.WriteOptions} */ (objectStack[0]);
+  var properties = feature.getProperties();
+  var context = {node: node, 'properties': properties};
+  var geometry = feature.getGeometry();
+  if (geometry) {
+    goog.asserts.assertInstanceof(geometry, ol.geom.LineString,
+        'geometry should be an ol.geom.LineString');
+    geometry = /** @type {ol.geom.LineString} */
+        (ol.format.Feature.transformWithOptions(geometry, true, options));
+    context['geometryLayout'] = geometry.getLayout();
+    properties['rtept'] = geometry.getCoordinates();
+  }
+  var parentNode = objectStack[objectStack.length - 1].node;
+  var orderedKeys = ol.format.GPX.RTE_SEQUENCE_[parentNode.namespaceURI];
+  var values = ol.xml.makeSequence(properties, orderedKeys);
+  ol.xml.pushSerializeAndPop(/** @type {ol.xml.NodeStackItem} */ (context),
+      ol.format.GPX.RTE_SERIALIZERS_, ol.xml.OBJECT_PROPERTY_NODE_FACTORY,
+      values, objectStack, orderedKeys);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.Feature} feature Feature.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GPX.writeTrk_ = function(node, feature, objectStack) {
+  var options = /** @type {olx.format.WriteOptions} */ (objectStack[0]);
+  var properties = feature.getProperties();
+  var context = {node: node, 'properties': properties};
+  var geometry = feature.getGeometry();
+  if (geometry) {
+    goog.asserts.assertInstanceof(geometry, ol.geom.MultiLineString,
+        'geometry should be an ol.geom.MultiLineString');
+    geometry = /** @type {ol.geom.MultiLineString} */
+        (ol.format.Feature.transformWithOptions(geometry, true, options));
+    properties['trkseg'] = geometry.getLineStrings();
+  }
+  var parentNode = objectStack[objectStack.length - 1].node;
+  var orderedKeys = ol.format.GPX.TRK_SEQUENCE_[parentNode.namespaceURI];
+  var values = ol.xml.makeSequence(properties, orderedKeys);
+  ol.xml.pushSerializeAndPop(/** @type {ol.xml.NodeStackItem} */ (context),
+      ol.format.GPX.TRK_SERIALIZERS_, ol.xml.OBJECT_PROPERTY_NODE_FACTORY,
+      values, objectStack, orderedKeys);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.LineString} lineString LineString.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GPX.writeTrkSeg_ = function(node, lineString, objectStack) {
+  var context = {node: node, 'geometryLayout': lineString.getLayout(),
+    'properties': {}};
+  ol.xml.pushSerializeAndPop(/** @type {ol.xml.NodeStackItem} */ (context),
+      ol.format.GPX.TRKSEG_SERIALIZERS_, ol.format.GPX.TRKSEG_NODE_FACTORY_,
+      lineString.getCoordinates(), objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.Feature} feature Feature.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.GPX.writeWpt_ = function(node, feature, objectStack) {
+  var options = /** @type {olx.format.WriteOptions} */ (objectStack[0]);
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  context['properties'] = feature.getProperties();
+  var geometry = feature.getGeometry();
+  if (geometry) {
+    goog.asserts.assertInstanceof(geometry, ol.geom.Point,
+        'geometry should be an ol.geom.Point');
+    geometry = /** @type {ol.geom.Point} */
+        (ol.format.Feature.transformWithOptions(geometry, true, options));
+    context['geometryLayout'] = geometry.getLayout();
+    ol.format.GPX.writeWptType_(node, geometry.getCoordinates(), objectStack);
+  }
+};
+
+
+/**
+ * @const
+ * @type {Array.<string>}
+ * @private
+ */
+ol.format.GPX.LINK_SEQUENCE_ = ['text', 'type'];
+
+
+/**
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.GPX.LINK_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.GPX.NAMESPACE_URIS_, {
+      'text': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'type': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Array.<string>>}
+ * @private
+ */
+ol.format.GPX.RTE_SEQUENCE_ = ol.xml.makeStructureNS(
+    ol.format.GPX.NAMESPACE_URIS_, [
+      'name', 'cmt', 'desc', 'src', 'link', 'number', 'type', 'rtept'
+    ]);
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.GPX.RTE_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.GPX.NAMESPACE_URIS_, {
+      'name': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'cmt': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'desc': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'src': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'link': ol.xml.makeChildAppender(ol.format.GPX.writeLink_),
+      'number': ol.xml.makeChildAppender(
+          ol.format.XSD.writeNonNegativeIntegerTextNode),
+      'type': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'rtept': ol.xml.makeArraySerializer(ol.xml.makeChildAppender(
+          ol.format.GPX.writeWptType_))
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Array.<string>>}
+ * @private
+ */
+ol.format.GPX.TRK_SEQUENCE_ = ol.xml.makeStructureNS(
+    ol.format.GPX.NAMESPACE_URIS_, [
+      'name', 'cmt', 'desc', 'src', 'link', 'number', 'type', 'trkseg'
+    ]);
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.GPX.TRK_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.GPX.NAMESPACE_URIS_, {
+      'name': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'cmt': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'desc': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'src': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'link': ol.xml.makeChildAppender(ol.format.GPX.writeLink_),
+      'number': ol.xml.makeChildAppender(
+          ol.format.XSD.writeNonNegativeIntegerTextNode),
+      'type': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'trkseg': ol.xml.makeArraySerializer(ol.xml.makeChildAppender(
+          ol.format.GPX.writeTrkSeg_))
+    });
+
+
+/**
+ * @const
+ * @type {function(*, Array.<*>, string=): (Node|undefined)}
+ * @private
+ */
+ol.format.GPX.TRKSEG_NODE_FACTORY_ = ol.xml.makeSimpleNodeFactory('trkpt');
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.GPX.TRKSEG_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.GPX.NAMESPACE_URIS_, {
+      'trkpt': ol.xml.makeChildAppender(ol.format.GPX.writeWptType_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Array.<string>>}
+ * @private
+ */
+ol.format.GPX.WPT_TYPE_SEQUENCE_ = ol.xml.makeStructureNS(
+    ol.format.GPX.NAMESPACE_URIS_, [
+      'ele', 'time', 'magvar', 'geoidheight', 'name', 'cmt', 'desc', 'src',
+      'link', 'sym', 'type', 'fix', 'sat', 'hdop', 'vdop', 'pdop',
+      'ageofdgpsdata', 'dgpsid'
+    ]);
+
+
+/**
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.GPX.WPT_TYPE_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.GPX.NAMESPACE_URIS_, {
+      'ele': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
+      'time': ol.xml.makeChildAppender(ol.format.XSD.writeDateTimeTextNode),
+      'magvar': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
+      'geoidheight': ol.xml.makeChildAppender(
+          ol.format.XSD.writeDecimalTextNode),
+      'name': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'cmt': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'desc': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'src': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'link': ol.xml.makeChildAppender(ol.format.GPX.writeLink_),
+      'sym': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'type': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'fix': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'sat': ol.xml.makeChildAppender(
+          ol.format.XSD.writeNonNegativeIntegerTextNode),
+      'hdop': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
+      'vdop': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
+      'pdop': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
+      'ageofdgpsdata': ol.xml.makeChildAppender(
+          ol.format.XSD.writeDecimalTextNode),
+      'dgpsid': ol.xml.makeChildAppender(
+          ol.format.XSD.writeNonNegativeIntegerTextNode)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, string>}
+ * @private
+ */
+ol.format.GPX.GEOMETRY_TYPE_TO_NODENAME_ = {
+  'Point': 'wpt',
+  'LineString': 'rte',
+  'MultiLineString': 'trk'
+};
+
+
+/**
+ * @const
+ * @param {*} value Value.
+ * @param {Array.<*>} objectStack Object stack.
+ * @param {string=} opt_nodeName Node name.
+ * @return {Node|undefined} Node.
+ * @private
+ */
+ol.format.GPX.GPX_NODE_FACTORY_ = function(value, objectStack, opt_nodeName) {
+  goog.asserts.assertInstanceof(value, ol.Feature,
+      'value should be an ol.Feature');
+  var geometry = value.getGeometry();
+  if (geometry) {
+    var nodeName = ol.format.GPX.GEOMETRY_TYPE_TO_NODENAME_[geometry.getType()];
+    if (nodeName) {
+      var parentNode = objectStack[objectStack.length - 1].node;
+      goog.asserts.assert(ol.xml.isNode(parentNode),
+          'parentNode should be an XML node');
+      return ol.xml.createElementNS(parentNode.namespaceURI, nodeName);
+    }
+  }
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.GPX.GPX_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.GPX.NAMESPACE_URIS_, {
+      'rte': ol.xml.makeChildAppender(ol.format.GPX.writeRte_),
+      'trk': ol.xml.makeChildAppender(ol.format.GPX.writeTrk_),
+      'wpt': ol.xml.makeChildAppender(ol.format.GPX.writeWpt_)
+    });
+
+
+/**
+ * Encode an array of features in the GPX format.
+ *
+ * @function
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {string} Result.
+ * @api stable
+ */
+ol.format.GPX.prototype.writeFeatures;
+
+
+/**
+ * Encode an array of features in the GPX format as an XML node.
+ *
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {olx.format.WriteOptions=} opt_options Options.
+ * @return {Node} Node.
+ * @api
+ */
+ol.format.GPX.prototype.writeFeaturesNode = function(features, opt_options) {
+  opt_options = this.adaptOptions(opt_options);
+  //FIXME Serialize metadata
+  var gpx = ol.xml.createElementNS('http://www.topografix.com/GPX/1/1', 'gpx');
+
+  ol.xml.pushSerializeAndPop(/** @type {ol.xml.NodeStackItem} */
+      ({node: gpx}), ol.format.GPX.GPX_SERIALIZERS_,
+      ol.format.GPX.GPX_NODE_FACTORY_, features, [opt_options]);
+  return gpx;
+};
+
+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Utilities for string newlines.
+ * @author nnaze@google.com (Nathan Naze)
+ */
+
+
+/**
+ * Namespace for string utilities
+ */
+goog.provide('goog.string.newlines');
+goog.provide('goog.string.newlines.Line');
+
+goog.require('goog.array');
+
+
+/**
+ * Splits a string into lines, properly handling universal newlines.
+ * @param {string} str String to split.
+ * @param {boolean=} opt_keepNewlines Whether to keep the newlines in the
+ *     resulting strings. Defaults to false.
+ * @return {!Array<string>} String split into lines.
+ */
+goog.string.newlines.splitLines = function(str, opt_keepNewlines) {
+  var lines = goog.string.newlines.getLines(str);
+  return goog.array.map(lines, function(line) {
+    return opt_keepNewlines ? line.getFullLine() : line.getContent();
+  });
+};
+
+
+
+/**
+ * Line metadata class that records the start/end indicies of lines
+ * in a string.  Can be used to implement common newline use cases such as
+ * splitLines() or determining line/column of an index in a string.
+ * Also implements methods to get line contents.
+ *
+ * Indexes are expressed as string indicies into string.substring(), inclusive
+ * at the start, exclusive at the end.
+ *
+ * Create an array of these with goog.string.newlines.getLines().
+ * @param {string} string The original string.
+ * @param {number} startLineIndex The index of the start of the line.
+ * @param {number} endContentIndex The index of the end of the line, excluding
+ *     newlines.
+ * @param {number} endLineIndex The index of the end of the line, index
+ *     newlines.
+ * @constructor
+ * @struct
+ * @final
+ */
+goog.string.newlines.Line = function(string, startLineIndex,
+                                     endContentIndex, endLineIndex) {
+  /**
+   * The original string.
+   * @type {string}
+   */
+  this.string = string;
+
+  /**
+   * Index of the start of the line.
+   * @type {number}
+   */
+  this.startLineIndex = startLineIndex;
+
+  /**
+   * Index of the end of the line, excluding any newline characters.
+   * Index is the first character after the line, suitable for
+   * String.substring().
+   * @type {number}
+   */
+  this.endContentIndex = endContentIndex;
+
+  /**
+   * Index of the end of the line, excluding any newline characters.
+   * Index is the first character after the line, suitable for
+   * String.substring().
+   * @type {number}
+   */
+
+  this.endLineIndex = endLineIndex;
+};
+
+
+/**
+ * @return {string} The content of the line, excluding any newline characters.
+ */
+goog.string.newlines.Line.prototype.getContent = function() {
+  return this.string.substring(this.startLineIndex, this.endContentIndex);
+};
+
+
+/**
+ * @return {string} The full line, including any newline characters.
+ */
+goog.string.newlines.Line.prototype.getFullLine = function() {
+  return this.string.substring(this.startLineIndex, this.endLineIndex);
+};
+
+
+/**
+ * @return {string} The newline characters, if any ('\n', \r', '\r\n', '', etc).
+ */
+goog.string.newlines.Line.prototype.getNewline = function() {
+  return this.string.substring(this.endContentIndex, this.endLineIndex);
+};
+
+
+/**
+ * Splits a string into an array of line metadata.
+ * @param {string} str String to split.
+ * @return {!Array<!goog.string.newlines.Line>} Array of line metadata.
+ */
+goog.string.newlines.getLines = function(str) {
+  // We use the constructor because literals are evaluated only once in
+  // < ES 3.1.
+  // See http://www.mail-archive.com/es-discuss@mozilla.org/msg01796.html
+  var re = RegExp('\r\n|\r|\n', 'g');
+  var sliceIndex = 0;
+  var result;
+  var lines = [];
+
+  while (result = re.exec(str)) {
+    var line = new goog.string.newlines.Line(
+        str, sliceIndex, result.index, result.index + result[0].length);
+    lines.push(line);
+
+    // remember where to start the slice from
+    sliceIndex = re.lastIndex;
+  }
+
+  // If the string does not end with a newline, add the last line.
+  if (sliceIndex < str.length) {
+    var line = new goog.string.newlines.Line(
+        str, sliceIndex, str.length, str.length);
+    lines.push(line);
+  }
+
+  return lines;
+};
+
+goog.provide('ol.format.TextFeature');
+
+goog.require('goog.asserts');
+goog.require('ol.format.Feature');
+goog.require('ol.format.FormatType');
+
+
+
+/**
+ * @classdesc
+ * Abstract base class; normally only used for creating subclasses and not
+ * instantiated in apps.
+ * Base class for text feature formats.
+ *
+ * @constructor
+ * @extends {ol.format.Feature}
+ */
+ol.format.TextFeature = function() {
+  goog.base(this);
+};
+goog.inherits(ol.format.TextFeature, ol.format.Feature);
+
+
+/**
+ * @param {Document|Node|Object|string} source Source.
+ * @private
+ * @return {string} Text.
+ */
+ol.format.TextFeature.prototype.getText_ = function(source) {
+  if (goog.isString(source)) {
+    return source;
+  } else {
+    goog.asserts.fail();
+    return '';
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.TextFeature.prototype.getType = function() {
+  return ol.format.FormatType.TEXT;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.TextFeature.prototype.readFeature = function(source, opt_options) {
+  return this.readFeatureFromText(
+      this.getText_(source), this.adaptOptions(opt_options));
+};
+
+
+/**
+ * @param {string} text Text.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @protected
+ * @return {ol.Feature} Feature.
+ */
+ol.format.TextFeature.prototype.readFeatureFromText = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.TextFeature.prototype.readFeatures = function(source, opt_options) {
+  return this.readFeaturesFromText(
+      this.getText_(source), this.adaptOptions(opt_options));
+};
+
+
+/**
+ * @param {string} text Text.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @protected
+ * @return {Array.<ol.Feature>} Features.
+ */
+ol.format.TextFeature.prototype.readFeaturesFromText = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.TextFeature.prototype.readGeometry = function(source, opt_options) {
+  return this.readGeometryFromText(
+      this.getText_(source), this.adaptOptions(opt_options));
+};
+
+
+/**
+ * @param {string} text Text.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @protected
+ * @return {ol.geom.Geometry} Geometry.
+ */
+ol.format.TextFeature.prototype.readGeometryFromText = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.TextFeature.prototype.readProjection = function(source) {
+  return this.readProjectionFromText(this.getText_(source));
+};
+
+
+/**
+ * @param {string} text Text.
+ * @protected
+ * @return {ol.proj.Projection} Projection.
+ */
+ol.format.TextFeature.prototype.readProjectionFromText = function(text) {
+  return this.defaultDataProjection;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.TextFeature.prototype.writeFeature = function(feature, opt_options) {
+  return this.writeFeatureText(feature, this.adaptOptions(opt_options));
+};
+
+
+/**
+ * @param {ol.Feature} feature Features.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @protected
+ * @return {string} Text.
+ */
+ol.format.TextFeature.prototype.writeFeatureText = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.TextFeature.prototype.writeFeatures = function(
+    features, opt_options) {
+  return this.writeFeaturesText(features, this.adaptOptions(opt_options));
+};
+
+
+/**
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @protected
+ * @return {string} Text.
+ */
+ol.format.TextFeature.prototype.writeFeaturesText = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.TextFeature.prototype.writeGeometry = function(
+    geometry, opt_options) {
+  return this.writeGeometryText(geometry, this.adaptOptions(opt_options));
+};
+
+
+/**
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @protected
+ * @return {string} Text.
+ */
+ol.format.TextFeature.prototype.writeGeometryText = goog.abstractMethod;
+
+goog.provide('ol.format.IGC');
+goog.provide('ol.format.IGCZ');
+
+goog.require('goog.asserts');
+goog.require('goog.string.newlines');
+goog.require('ol.Feature');
+goog.require('ol.format.Feature');
+goog.require('ol.format.TextFeature');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.LineString');
+goog.require('ol.proj');
+
+
+/**
+ * IGC altitude/z. One of 'barometric', 'gps', 'none'.
+ * @enum {string}
+ * @api
+ */
+ol.format.IGCZ = {
+  BAROMETRIC: 'barometric',
+  GPS: 'gps',
+  NONE: 'none'
+};
+
+
+
+/**
+ * @classdesc
+ * Feature format for `*.igc` flight recording files.
+ *
+ * @constructor
+ * @extends {ol.format.TextFeature}
+ * @param {olx.format.IGCOptions=} opt_options Options.
+ * @api
+ */
+ol.format.IGC = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  goog.base(this);
+
+  /**
+   * @inheritDoc
+   */
+  this.defaultDataProjection = ol.proj.get('EPSG:4326');
+
+  /**
+   * @private
+   * @type {ol.format.IGCZ}
+   */
+  this.altitudeMode_ = options.altitudeMode ?
+      options.altitudeMode : ol.format.IGCZ.NONE;
+
+};
+goog.inherits(ol.format.IGC, ol.format.TextFeature);
+
+
+/**
+ * @const
+ * @type {Array.<string>}
+ * @private
+ */
+ol.format.IGC.EXTENSIONS_ = ['.igc'];
+
+
+/**
+ * @const
+ * @type {RegExp}
+ * @private
+ */
+ol.format.IGC.B_RECORD_RE_ =
+    /^B(\d{2})(\d{2})(\d{2})(\d{2})(\d{5})([NS])(\d{3})(\d{5})([EW])([AV])(\d{5})(\d{5})/;
+
+
+/**
+ * @const
+ * @type {RegExp}
+ * @private
+ */
+ol.format.IGC.H_RECORD_RE_ = /^H.([A-Z]{3}).*?:(.*)/;
+
+
+/**
+ * @const
+ * @type {RegExp}
+ * @private
+ */
+ol.format.IGC.HFDTE_RECORD_RE_ = /^HFDTE(\d{2})(\d{2})(\d{2})/;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.IGC.prototype.getExtensions = function() {
+  return ol.format.IGC.EXTENSIONS_;
+};
+
+
+/**
+ * Read the feature from the IGC source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {ol.Feature} Feature.
+ * @api
+ */
+ol.format.IGC.prototype.readFeature;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.IGC.prototype.readFeatureFromText = function(text, opt_options) {
+  var altitudeMode = this.altitudeMode_;
+  var lines = goog.string.newlines.splitLines(text);
+  /** @type {Object.<string, string>} */
+  var properties = {};
+  var flatCoordinates = [];
+  var year = 2000;
+  var month = 0;
+  var day = 1;
+  var i, ii;
+  for (i = 0, ii = lines.length; i < ii; ++i) {
+    var line = lines[i];
+    var m;
+    if (line.charAt(0) == 'B') {
+      m = ol.format.IGC.B_RECORD_RE_.exec(line);
+      if (m) {
+        var hour = parseInt(m[1], 10);
+        var minute = parseInt(m[2], 10);
+        var second = parseInt(m[3], 10);
+        var y = parseInt(m[4], 10) + parseInt(m[5], 10) / 60000;
+        if (m[6] == 'S') {
+          y = -y;
+        }
+        var x = parseInt(m[7], 10) + parseInt(m[8], 10) / 60000;
+        if (m[9] == 'W') {
+          x = -x;
+        }
+        flatCoordinates.push(x, y);
+        if (altitudeMode != ol.format.IGCZ.NONE) {
+          var z;
+          if (altitudeMode == ol.format.IGCZ.GPS) {
+            z = parseInt(m[11], 10);
+          } else if (altitudeMode == ol.format.IGCZ.BAROMETRIC) {
+            z = parseInt(m[12], 10);
+          } else {
+            goog.asserts.fail();
+            z = 0;
+          }
+          flatCoordinates.push(z);
+        }
+        var dateTime = Date.UTC(year, month, day, hour, minute, second);
+        flatCoordinates.push(dateTime / 1000);
+      }
+    } else if (line.charAt(0) == 'H') {
+      m = ol.format.IGC.HFDTE_RECORD_RE_.exec(line);
+      if (m) {
+        day = parseInt(m[1], 10);
+        month = parseInt(m[2], 10) - 1;
+        year = 2000 + parseInt(m[3], 10);
+      } else {
+        m = ol.format.IGC.H_RECORD_RE_.exec(line);
+        if (m) {
+          properties[m[1]] = m[2].trim();
+          m = ol.format.IGC.HFDTE_RECORD_RE_.exec(line);
+        }
+      }
+    }
+  }
+  if (flatCoordinates.length === 0) {
+    return null;
+  }
+  var lineString = new ol.geom.LineString(null);
+  var layout = altitudeMode == ol.format.IGCZ.NONE ?
+      ol.geom.GeometryLayout.XYM : ol.geom.GeometryLayout.XYZM;
+  lineString.setFlatCoordinates(layout, flatCoordinates);
+  var feature = new ol.Feature(ol.format.Feature.transformWithOptions(
+      lineString, false, opt_options));
+  feature.setProperties(properties);
+  return feature;
+};
+
+
+/**
+ * Read the feature from the source. As IGC sources contain a single
+ * feature, this will return the feature in an array.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {Array.<ol.Feature>} Features.
+ * @api
+ */
+ol.format.IGC.prototype.readFeatures;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.IGC.prototype.readFeaturesFromText = function(text, opt_options) {
+  var feature = this.readFeatureFromText(text, opt_options);
+  if (feature) {
+    return [feature];
+  } else {
+    return [];
+  }
+};
+
+
+/**
+ * Read the projection from the IGC source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @return {ol.proj.Projection} Projection.
+ * @api
+ */
+ol.format.IGC.prototype.readProjection;
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Class for parsing and formatting URIs.
+ *
+ * Use goog.Uri(string) to parse a URI string.  Use goog.Uri.create(...) to
+ * create a new instance of the goog.Uri object from Uri parts.
+ *
+ * e.g: <code>var myUri = new goog.Uri(window.location);</code>
+ *
+ * Implements RFC 3986 for parsing/formatting URIs.
+ * http://www.ietf.org/rfc/rfc3986.txt
+ *
+ * Some changes have been made to the interface (more like .NETs), though the
+ * internal representation is now of un-encoded parts, this will change the
+ * behavior slightly.
+ *
+ */
+
+goog.provide('goog.Uri');
+goog.provide('goog.Uri.QueryData');
+
+goog.require('goog.array');
+goog.require('goog.string');
+goog.require('goog.structs');
+goog.require('goog.structs.Map');
+goog.require('goog.uri.utils');
+goog.require('goog.uri.utils.ComponentIndex');
+goog.require('goog.uri.utils.StandardQueryParam');
+
+
+
+/**
+ * This class contains setters and getters for the parts of the URI.
+ * The <code>getXyz</code>/<code>setXyz</code> methods return the decoded part
+ * -- so<code>goog.Uri.parse('/foo%20bar').getPath()</code> will return the
+ * decoded path, <code>/foo bar</code>.
+ *
+ * Reserved characters (see RFC 3986 section 2.2) can be present in
+ * their percent-encoded form in scheme, domain, and path URI components and
+ * will not be auto-decoded. For example:
+ * <code>goog.Uri.parse('rel%61tive/path%2fto/resource').getPath()</code> will
+ * return <code>relative/path%2fto/resource</code>.
+ *
+ * The constructor accepts an optional unparsed, raw URI string.  The parser
+ * is relaxed, so special characters that aren't escaped but don't cause
+ * ambiguities will not cause parse failures.
+ *
+ * All setters return <code>this</code> and so may be chained, a la
+ * <code>goog.Uri.parse('/foo').setFragment('part').toString()</code>.
+ *
+ * @param {*=} opt_uri Optional string URI to parse
+ *        (use goog.Uri.create() to create a URI from parts), or if
+ *        a goog.Uri is passed, a clone is created.
+ * @param {boolean=} opt_ignoreCase If true, #getParameterValue will ignore
+ * the case of the parameter name.
+ *
+ * @throws URIError If opt_uri is provided and URI is malformed (that is,
+ *     if decodeURIComponent fails on any of the URI components).
+ * @constructor
+ * @struct
+ */
+goog.Uri = function(opt_uri, opt_ignoreCase) {
+  /**
+   * Scheme such as "http".
+   * @private {string}
+   */
+  this.scheme_ = '';
+
+  /**
+   * User credentials in the form "username:password".
+   * @private {string}
+   */
+  this.userInfo_ = '';
+
+  /**
+   * Domain part, e.g. "www.google.com".
+   * @private {string}
+   */
+  this.domain_ = '';
+
+  /**
+   * Port, e.g. 8080.
+   * @private {?number}
+   */
+  this.port_ = null;
+
+  /**
+   * Path, e.g. "/tests/img.png".
+   * @private {string}
+   */
+  this.path_ = '';
+
+  /**
+   * The fragment without the #.
+   * @private {string}
+   */
+  this.fragment_ = '';
+
+  /**
+   * Whether or not this Uri should be treated as Read Only.
+   * @private {boolean}
+   */
+  this.isReadOnly_ = false;
+
+  /**
+   * Whether or not to ignore case when comparing query params.
+   * @private {boolean}
+   */
+  this.ignoreCase_ = false;
+
+  /**
+   * Object representing query data.
+   * @private {!goog.Uri.QueryData}
+   */
+  this.queryData_;
+
+  // Parse in the uri string
+  var m;
+  if (opt_uri instanceof goog.Uri) {
+    this.ignoreCase_ = goog.isDef(opt_ignoreCase) ?
+        opt_ignoreCase : opt_uri.getIgnoreCase();
+    this.setScheme(opt_uri.getScheme());
+    this.setUserInfo(opt_uri.getUserInfo());
+    this.setDomain(opt_uri.getDomain());
+    this.setPort(opt_uri.getPort());
+    this.setPath(opt_uri.getPath());
+    this.setQueryData(opt_uri.getQueryData().clone());
+    this.setFragment(opt_uri.getFragment());
+  } else if (opt_uri && (m = goog.uri.utils.split(String(opt_uri)))) {
+    this.ignoreCase_ = !!opt_ignoreCase;
+
+    // Set the parts -- decoding as we do so.
+    // COMPATABILITY NOTE - In IE, unmatched fields may be empty strings,
+    // whereas in other browsers they will be undefined.
+    this.setScheme(m[goog.uri.utils.ComponentIndex.SCHEME] || '', true);
+    this.setUserInfo(m[goog.uri.utils.ComponentIndex.USER_INFO] || '', true);
+    this.setDomain(m[goog.uri.utils.ComponentIndex.DOMAIN] || '', true);
+    this.setPort(m[goog.uri.utils.ComponentIndex.PORT]);
+    this.setPath(m[goog.uri.utils.ComponentIndex.PATH] || '', true);
+    this.setQueryData(m[goog.uri.utils.ComponentIndex.QUERY_DATA] || '', true);
+    this.setFragment(m[goog.uri.utils.ComponentIndex.FRAGMENT] || '', true);
+
+  } else {
+    this.ignoreCase_ = !!opt_ignoreCase;
+    this.queryData_ = new goog.Uri.QueryData(null, null, this.ignoreCase_);
+  }
+};
+
+
+/**
+ * If true, we preserve the type of query parameters set programmatically.
+ *
+ * This means that if you set a parameter to a boolean, and then call
+ * getParameterValue, you will get a boolean back.
+ *
+ * If false, we will coerce parameters to strings, just as they would
+ * appear in real URIs.
+ *
+ * TODO(nicksantos): Remove this once people have time to fix all tests.
+ *
+ * @type {boolean}
+ */
+goog.Uri.preserveParameterTypesCompatibilityFlag = false;
+
+
+/**
+ * Parameter name added to stop caching.
+ * @type {string}
+ */
+goog.Uri.RANDOM_PARAM = goog.uri.utils.StandardQueryParam.RANDOM;
+
+
+/**
+ * @return {string} The string form of the url.
+ * @override
+ */
+goog.Uri.prototype.toString = function() {
+  var out = [];
+
+  var scheme = this.getScheme();
+  if (scheme) {
+    out.push(goog.Uri.encodeSpecialChars_(
+        scheme, goog.Uri.reDisallowedInSchemeOrUserInfo_, true), ':');
+  }
+
+  var domain = this.getDomain();
+  if (domain || scheme == 'file') {
+    out.push('//');
+
+    var userInfo = this.getUserInfo();
+    if (userInfo) {
+      out.push(goog.Uri.encodeSpecialChars_(
+          userInfo, goog.Uri.reDisallowedInSchemeOrUserInfo_, true), '@');
+    }
+
+    out.push(goog.Uri.removeDoubleEncoding_(goog.string.urlEncode(domain)));
+
+    var port = this.getPort();
+    if (port != null) {
+      out.push(':', String(port));
+    }
+  }
+
+  var path = this.getPath();
+  if (path) {
+    if (this.hasDomain() && path.charAt(0) != '/') {
+      out.push('/');
+    }
+    out.push(goog.Uri.encodeSpecialChars_(
+        path,
+        path.charAt(0) == '/' ?
+            goog.Uri.reDisallowedInAbsolutePath_ :
+            goog.Uri.reDisallowedInRelativePath_,
+        true));
+  }
+
+  var query = this.getEncodedQuery();
+  if (query) {
+    out.push('?', query);
+  }
+
+  var fragment = this.getFragment();
+  if (fragment) {
+    out.push('#', goog.Uri.encodeSpecialChars_(
+        fragment, goog.Uri.reDisallowedInFragment_));
+  }
+  return out.join('');
+};
+
+
+/**
+ * Resolves the given relative URI (a goog.Uri object), using the URI
+ * represented by this instance as the base URI.
+ *
+ * There are several kinds of relative URIs:<br>
+ * 1. foo - replaces the last part of the path, the whole query and fragment<br>
+ * 2. /foo - replaces the the path, the query and fragment<br>
+ * 3. //foo - replaces everything from the domain on.  foo is a domain name<br>
+ * 4. ?foo - replace the query and fragment<br>
+ * 5. #foo - replace the fragment only
+ *
+ * Additionally, if relative URI has a non-empty path, all ".." and "."
+ * segments will be resolved, as described in RFC 3986.
+ *
+ * @param {!goog.Uri} relativeUri The relative URI to resolve.
+ * @return {!goog.Uri} The resolved URI.
+ */
+goog.Uri.prototype.resolve = function(relativeUri) {
+
+  var absoluteUri = this.clone();
+
+  // we satisfy these conditions by looking for the first part of relativeUri
+  // that is not blank and applying defaults to the rest
+
+  var overridden = relativeUri.hasScheme();
+
+  if (overridden) {
+    absoluteUri.setScheme(relativeUri.getScheme());
+  } else {
+    overridden = relativeUri.hasUserInfo();
+  }
+
+  if (overridden) {
+    absoluteUri.setUserInfo(relativeUri.getUserInfo());
+  } else {
+    overridden = relativeUri.hasDomain();
+  }
+
+  if (overridden) {
+    absoluteUri.setDomain(relativeUri.getDomain());
+  } else {
+    overridden = relativeUri.hasPort();
+  }
+
+  var path = relativeUri.getPath();
+  if (overridden) {
+    absoluteUri.setPort(relativeUri.getPort());
+  } else {
+    overridden = relativeUri.hasPath();
+    if (overridden) {
+      // resolve path properly
+      if (path.charAt(0) != '/') {
+        // path is relative
+        if (this.hasDomain() && !this.hasPath()) {
+          // RFC 3986, section 5.2.3, case 1
+          path = '/' + path;
+        } else {
+          // RFC 3986, section 5.2.3, case 2
+          var lastSlashIndex = absoluteUri.getPath().lastIndexOf('/');
+          if (lastSlashIndex != -1) {
+            path = absoluteUri.getPath().substr(0, lastSlashIndex + 1) + path;
+          }
+        }
+      }
+      path = goog.Uri.removeDotSegments(path);
+    }
+  }
+
+  if (overridden) {
+    absoluteUri.setPath(path);
+  } else {
+    overridden = relativeUri.hasQuery();
+  }
+
+  if (overridden) {
+    absoluteUri.setQueryData(relativeUri.getDecodedQuery());
+  } else {
+    overridden = relativeUri.hasFragment();
+  }
+
+  if (overridden) {
+    absoluteUri.setFragment(relativeUri.getFragment());
+  }
+
+  return absoluteUri;
+};
+
+
+/**
+ * Clones the URI instance.
+ * @return {!goog.Uri} New instance of the URI object.
+ */
+goog.Uri.prototype.clone = function() {
+  return new goog.Uri(this);
+};
+
+
+/**
+ * @return {string} The encoded scheme/protocol for the URI.
+ */
+goog.Uri.prototype.getScheme = function() {
+  return this.scheme_;
+};
+
+
+/**
+ * Sets the scheme/protocol.
+ * @throws URIError If opt_decode is true and newScheme is malformed (that is,
+ *     if decodeURIComponent fails).
+ * @param {string} newScheme New scheme value.
+ * @param {boolean=} opt_decode Optional param for whether to decode new value.
+ * @return {!goog.Uri} Reference to this URI object.
+ */
+goog.Uri.prototype.setScheme = function(newScheme, opt_decode) {
+  this.enforceReadOnly();
+  this.scheme_ = opt_decode ? goog.Uri.decodeOrEmpty_(newScheme, true) :
+      newScheme;
+
+  // remove an : at the end of the scheme so somebody can pass in
+  // window.location.protocol
+  if (this.scheme_) {
+    this.scheme_ = this.scheme_.replace(/:$/, '');
+  }
+  return this;
+};
+
+
+/**
+ * @return {boolean} Whether the scheme has been set.
+ */
+goog.Uri.prototype.hasScheme = function() {
+  return !!this.scheme_;
+};
+
+
+/**
+ * @return {string} The decoded user info.
+ */
+goog.Uri.prototype.getUserInfo = function() {
+  return this.userInfo_;
+};
+
+
+/**
+ * Sets the userInfo.
+ * @throws URIError If opt_decode is true and newUserInfo is malformed (that is,
+ *     if decodeURIComponent fails).
+ * @param {string} newUserInfo New userInfo value.
+ * @param {boolean=} opt_decode Optional param for whether to decode new value.
+ * @return {!goog.Uri} Reference to this URI object.
+ */
+goog.Uri.prototype.setUserInfo = function(newUserInfo, opt_decode) {
+  this.enforceReadOnly();
+  this.userInfo_ = opt_decode ? goog.Uri.decodeOrEmpty_(newUserInfo) :
+                   newUserInfo;
+  return this;
+};
+
+
+/**
+ * @return {boolean} Whether the user info has been set.
+ */
+goog.Uri.prototype.hasUserInfo = function() {
+  return !!this.userInfo_;
+};
+
+
+/**
+ * @return {string} The decoded domain.
+ */
+goog.Uri.prototype.getDomain = function() {
+  return this.domain_;
+};
+
+
+/**
+ * Sets the domain.
+ * @throws URIError If opt_decode is true and newDomain is malformed (that is,
+ *     if decodeURIComponent fails).
+ * @param {string} newDomain New domain value.
+ * @param {boolean=} opt_decode Optional param for whether to decode new value.
+ * @return {!goog.Uri} Reference to this URI object.
+ */
+goog.Uri.prototype.setDomain = function(newDomain, opt_decode) {
+  this.enforceReadOnly();
+  this.domain_ = opt_decode ? goog.Uri.decodeOrEmpty_(newDomain, true) :
+      newDomain;
+  return this;
+};
+
+
+/**
+ * @return {boolean} Whether the domain has been set.
+ */
+goog.Uri.prototype.hasDomain = function() {
+  return !!this.domain_;
+};
+
+
+/**
+ * @return {?number} The port number.
+ */
+goog.Uri.prototype.getPort = function() {
+  return this.port_;
+};
+
+
+/**
+ * Sets the port number.
+ * @param {*} newPort Port number. Will be explicitly casted to a number.
+ * @return {!goog.Uri} Reference to this URI object.
+ */
+goog.Uri.prototype.setPort = function(newPort) {
+  this.enforceReadOnly();
+
+  if (newPort) {
+    newPort = Number(newPort);
+    if (isNaN(newPort) || newPort < 0) {
+      throw Error('Bad port number ' + newPort);
+    }
+    this.port_ = newPort;
+  } else {
+    this.port_ = null;
+  }
+
+  return this;
+};
+
+
+/**
+ * @return {boolean} Whether the port has been set.
+ */
+goog.Uri.prototype.hasPort = function() {
+  return this.port_ != null;
+};
+
+
+/**
+  * @return {string} The decoded path.
+ */
+goog.Uri.prototype.getPath = function() {
+  return this.path_;
+};
+
+
+/**
+ * Sets the path.
+ * @throws URIError If opt_decode is true and newPath is malformed (that is,
+ *     if decodeURIComponent fails).
+ * @param {string} newPath New path value.
+ * @param {boolean=} opt_decode Optional param for whether to decode new value.
+ * @return {!goog.Uri} Reference to this URI object.
+ */
+goog.Uri.prototype.setPath = function(newPath, opt_decode) {
+  this.enforceReadOnly();
+  this.path_ = opt_decode ? goog.Uri.decodeOrEmpty_(newPath, true) : newPath;
+  return this;
+};
+
+
+/**
+ * @return {boolean} Whether the path has been set.
+ */
+goog.Uri.prototype.hasPath = function() {
+  return !!this.path_;
+};
+
+
+/**
+ * @return {boolean} Whether the query string has been set.
+ */
+goog.Uri.prototype.hasQuery = function() {
+  return this.queryData_.toString() !== '';
+};
+
+
+/**
+ * Sets the query data.
+ * @param {goog.Uri.QueryData|string|undefined} queryData QueryData object.
+ * @param {boolean=} opt_decode Optional param for whether to decode new value.
+ *     Applies only if queryData is a string.
+ * @return {!goog.Uri} Reference to this URI object.
+ */
+goog.Uri.prototype.setQueryData = function(queryData, opt_decode) {
+  this.enforceReadOnly();
+
+  if (queryData instanceof goog.Uri.QueryData) {
+    this.queryData_ = queryData;
+    this.queryData_.setIgnoreCase(this.ignoreCase_);
+  } else {
+    if (!opt_decode) {
+      // QueryData accepts encoded query string, so encode it if
+      // opt_decode flag is not true.
+      queryData = goog.Uri.encodeSpecialChars_(queryData,
+                                               goog.Uri.reDisallowedInQuery_);
+    }
+    this.queryData_ = new goog.Uri.QueryData(queryData, null, this.ignoreCase_);
+  }
+
+  return this;
+};
+
+
+/**
+ * Sets the URI query.
+ * @param {string} newQuery New query value.
+ * @param {boolean=} opt_decode Optional param for whether to decode new value.
+ * @return {!goog.Uri} Reference to this URI object.
+ */
+goog.Uri.prototype.setQuery = function(newQuery, opt_decode) {
+  return this.setQueryData(newQuery, opt_decode);
+};
+
+
+/**
+ * @return {string} The encoded URI query, not including the ?.
+ */
+goog.Uri.prototype.getEncodedQuery = function() {
+  return this.queryData_.toString();
+};
+
+
+/**
+ * @return {string} The decoded URI query, not including the ?.
+ */
+goog.Uri.prototype.getDecodedQuery = function() {
+  return this.queryData_.toDecodedString();
+};
+
+
+/**
+ * Returns the query data.
+ * @return {!goog.Uri.QueryData} QueryData object.
+ */
+goog.Uri.prototype.getQueryData = function() {
+  return this.queryData_;
+};
+
+
+/**
+ * @return {string} The encoded URI query, not including the ?.
+ *
+ * Warning: This method, unlike other getter methods, returns encoded
+ * value, instead of decoded one.
+ */
+goog.Uri.prototype.getQuery = function() {
+  return this.getEncodedQuery();
+};
+
+
+/**
+ * Sets the value of the named query parameters, clearing previous values for
+ * that key.
+ *
+ * @param {string} key The parameter to set.
+ * @param {*} value The new value.
+ * @return {!goog.Uri} Reference to this URI object.
+ */
+goog.Uri.prototype.setParameterValue = function(key, value) {
+  this.enforceReadOnly();
+  this.queryData_.set(key, value);
+  return this;
+};
+
+
+/**
+ * Sets the values of the named query parameters, clearing previous values for
+ * that key.  Not new values will currently be moved to the end of the query
+ * string.
+ *
+ * So, <code>goog.Uri.parse('foo?a=b&c=d&e=f').setParameterValues('c', ['new'])
+ * </code> yields <tt>foo?a=b&e=f&c=new</tt>.</p>
+ *
+ * @param {string} key The parameter to set.
+ * @param {*} values The new values. If values is a single
+ *     string then it will be treated as the sole value.
+ * @return {!goog.Uri} Reference to this URI object.
+ */
+goog.Uri.prototype.setParameterValues = function(key, values) {
+  this.enforceReadOnly();
+
+  if (!goog.isArray(values)) {
+    values = [String(values)];
+  }
+
+  this.queryData_.setValues(key, values);
+
+  return this;
+};
+
+
+/**
+ * Returns the value<b>s</b> for a given cgi parameter as a list of decoded
+ * query parameter values.
+ * @param {string} name The parameter to get values for.
+ * @return {!Array<?>} The values for a given cgi parameter as a list of
+ *     decoded query parameter values.
+ */
+goog.Uri.prototype.getParameterValues = function(name) {
+  return this.queryData_.getValues(name);
+};
+
+
+/**
+ * Returns the first value for a given cgi parameter or undefined if the given
+ * parameter name does not appear in the query string.
+ * @param {string} paramName Unescaped parameter name.
+ * @return {string|undefined} The first value for a given cgi parameter or
+ *     undefined if the given parameter name does not appear in the query
+ *     string.
+ */
+goog.Uri.prototype.getParameterValue = function(paramName) {
+  // NOTE(nicksantos): This type-cast is a lie when
+  // preserveParameterTypesCompatibilityFlag is set to true.
+  // But this should only be set to true in tests.
+  return /** @type {string|undefined} */ (this.queryData_.get(paramName));
+};
+
+
+/**
+ * @return {string} The URI fragment, not including the #.
+ */
+goog.Uri.prototype.getFragment = function() {
+  return this.fragment_;
+};
+
+
+/**
+ * Sets the URI fragment.
+ * @throws URIError If opt_decode is true and newFragment is malformed (that is,
+ *     if decodeURIComponent fails).
+ * @param {string} newFragment New fragment value.
+ * @param {boolean=} opt_decode Optional param for whether to decode new value.
+ * @return {!goog.Uri} Reference to this URI object.
+ */
+goog.Uri.prototype.setFragment = function(newFragment, opt_decode) {
+  this.enforceReadOnly();
+  this.fragment_ = opt_decode ? goog.Uri.decodeOrEmpty_(newFragment) :
+                   newFragment;
+  return this;
+};
+
+
+/**
+ * @return {boolean} Whether the URI has a fragment set.
+ */
+goog.Uri.prototype.hasFragment = function() {
+  return !!this.fragment_;
+};
+
+
+/**
+ * Returns true if this has the same domain as that of uri2.
+ * @param {!goog.Uri} uri2 The URI object to compare to.
+ * @return {boolean} true if same domain; false otherwise.
+ */
+goog.Uri.prototype.hasSameDomainAs = function(uri2) {
+  return ((!this.hasDomain() && !uri2.hasDomain()) ||
+          this.getDomain() == uri2.getDomain()) &&
+      ((!this.hasPort() && !uri2.hasPort()) ||
+          this.getPort() == uri2.getPort());
+};
+
+
+/**
+ * Adds a random parameter to the Uri.
+ * @return {!goog.Uri} Reference to this Uri object.
+ */
+goog.Uri.prototype.makeUnique = function() {
+  this.enforceReadOnly();
+  this.setParameterValue(goog.Uri.RANDOM_PARAM, goog.string.getRandomString());
+
+  return this;
+};
+
+
+/**
+ * Removes the named query parameter.
+ *
+ * @param {string} key The parameter to remove.
+ * @return {!goog.Uri} Reference to this URI object.
+ */
+goog.Uri.prototype.removeParameter = function(key) {
+  this.enforceReadOnly();
+  this.queryData_.remove(key);
+  return this;
+};
+
+
+/**
+ * Sets whether Uri is read only. If this goog.Uri is read-only,
+ * enforceReadOnly_ will be called at the start of any function that may modify
+ * this Uri.
+ * @param {boolean} isReadOnly whether this goog.Uri should be read only.
+ * @return {!goog.Uri} Reference to this Uri object.
+ */
+goog.Uri.prototype.setReadOnly = function(isReadOnly) {
+  this.isReadOnly_ = isReadOnly;
+  return this;
+};
+
+
+/**
+ * @return {boolean} Whether the URI is read only.
+ */
+goog.Uri.prototype.isReadOnly = function() {
+  return this.isReadOnly_;
+};
+
+
+/**
+ * Checks if this Uri has been marked as read only, and if so, throws an error.
+ * This should be called whenever any modifying function is called.
+ */
+goog.Uri.prototype.enforceReadOnly = function() {
+  if (this.isReadOnly_) {
+    throw Error('Tried to modify a read-only Uri');
+  }
+};
+
+
+/**
+ * Sets whether to ignore case.
+ * NOTE: If there are already key/value pairs in the QueryData, and
+ * ignoreCase_ is set to false, the keys will all be lower-cased.
+ * @param {boolean} ignoreCase whether this goog.Uri should ignore case.
+ * @return {!goog.Uri} Reference to this Uri object.
+ */
+goog.Uri.prototype.setIgnoreCase = function(ignoreCase) {
+  this.ignoreCase_ = ignoreCase;
+  if (this.queryData_) {
+    this.queryData_.setIgnoreCase(ignoreCase);
+  }
+  return this;
+};
+
+
+/**
+ * @return {boolean} Whether to ignore case.
+ */
+goog.Uri.prototype.getIgnoreCase = function() {
+  return this.ignoreCase_;
+};
+
+
+//==============================================================================
+// Static members
+//==============================================================================
+
+
+/**
+ * Creates a uri from the string form.  Basically an alias of new goog.Uri().
+ * If a Uri object is passed to parse then it will return a clone of the object.
+ *
+ * @throws URIError If parsing the URI is malformed. The passed URI components
+ *     should all be parseable by decodeURIComponent.
+ * @param {*} uri Raw URI string or instance of Uri
+ *     object.
+ * @param {boolean=} opt_ignoreCase Whether to ignore the case of parameter
+ * names in #getParameterValue.
+ * @return {!goog.Uri} The new URI object.
+ */
+goog.Uri.parse = function(uri, opt_ignoreCase) {
+  return uri instanceof goog.Uri ?
+         uri.clone() : new goog.Uri(uri, opt_ignoreCase);
+};
+
+
+/**
+ * Creates a new goog.Uri object from unencoded parts.
+ *
+ * @param {?string=} opt_scheme Scheme/protocol or full URI to parse.
+ * @param {?string=} opt_userInfo username:password.
+ * @param {?string=} opt_domain www.google.com.
+ * @param {?number=} opt_port 9830.
+ * @param {?string=} opt_path /some/path/to/a/file.html.
+ * @param {string|goog.Uri.QueryData=} opt_query a=1&b=2.
+ * @param {?string=} opt_fragment The fragment without the #.
+ * @param {boolean=} opt_ignoreCase Whether to ignore parameter name case in
+ *     #getParameterValue.
+ *
+ * @return {!goog.Uri} The new URI object.
+ */
+goog.Uri.create = function(opt_scheme, opt_userInfo, opt_domain, opt_port,
+                           opt_path, opt_query, opt_fragment, opt_ignoreCase) {
+
+  var uri = new goog.Uri(null, opt_ignoreCase);
+
+  // Only set the parts if they are defined and not empty strings.
+  opt_scheme && uri.setScheme(opt_scheme);
+  opt_userInfo && uri.setUserInfo(opt_userInfo);
+  opt_domain && uri.setDomain(opt_domain);
+  opt_port && uri.setPort(opt_port);
+  opt_path && uri.setPath(opt_path);
+  opt_query && uri.setQueryData(opt_query);
+  opt_fragment && uri.setFragment(opt_fragment);
+
+  return uri;
+};
+
+
+/**
+ * Resolves a relative Uri against a base Uri, accepting both strings and
+ * Uri objects.
+ *
+ * @param {*} base Base Uri.
+ * @param {*} rel Relative Uri.
+ * @return {!goog.Uri} Resolved uri.
+ */
+goog.Uri.resolve = function(base, rel) {
+  if (!(base instanceof goog.Uri)) {
+    base = goog.Uri.parse(base);
+  }
+
+  if (!(rel instanceof goog.Uri)) {
+    rel = goog.Uri.parse(rel);
+  }
+
+  return base.resolve(rel);
+};
+
+
+/**
+ * Removes dot segments in given path component, as described in
+ * RFC 3986, section 5.2.4.
+ *
+ * @param {string} path A non-empty path component.
+ * @return {string} Path component with removed dot segments.
+ */
+goog.Uri.removeDotSegments = function(path) {
+  if (path == '..' || path == '.') {
+    return '';
+
+  } else if (!goog.string.contains(path, './') &&
+             !goog.string.contains(path, '/.')) {
+    // This optimization detects uris which do not contain dot-segments,
+    // and as a consequence do not require any processing.
+    return path;
+
+  } else {
+    var leadingSlash = goog.string.startsWith(path, '/');
+    var segments = path.split('/');
+    var out = [];
+
+    for (var pos = 0; pos < segments.length; ) {
+      var segment = segments[pos++];
+
+      if (segment == '.') {
+        if (leadingSlash && pos == segments.length) {
+          out.push('');
+        }
+      } else if (segment == '..') {
+        if (out.length > 1 || out.length == 1 && out[0] != '') {
+          out.pop();
+        }
+        if (leadingSlash && pos == segments.length) {
+          out.push('');
+        }
+      } else {
+        out.push(segment);
+        leadingSlash = true;
+      }
+    }
+
+    return out.join('/');
+  }
+};
+
+
+/**
+ * Decodes a value or returns the empty string if it isn't defined or empty.
+ * @throws URIError If decodeURIComponent fails to decode val.
+ * @param {string|undefined} val Value to decode.
+ * @param {boolean=} opt_preserveReserved If true, restricted characters will
+ *     not be decoded.
+ * @return {string} Decoded value.
+ * @private
+ */
+goog.Uri.decodeOrEmpty_ = function(val, opt_preserveReserved) {
+  // Don't use UrlDecode() here because val is not a query parameter.
+  if (!val) {
+    return '';
+  }
+
+  // decodeURI has the same output for '%2f' and '%252f'. We double encode %25
+  // so that we can distinguish between the 2 inputs. This is later undone by
+  // removeDoubleEncoding_.
+  return opt_preserveReserved ?
+      decodeURI(val.replace(/%25/g, '%2525')) : decodeURIComponent(val);
+};
+
+
+/**
+ * If unescapedPart is non null, then escapes any characters in it that aren't
+ * valid characters in a url and also escapes any special characters that
+ * appear in extra.
+ *
+ * @param {*} unescapedPart The string to encode.
+ * @param {RegExp} extra A character set of characters in [\01-\177].
+ * @param {boolean=} opt_removeDoubleEncoding If true, remove double percent
+ *     encoding.
+ * @return {?string} null iff unescapedPart == null.
+ * @private
+ */
+goog.Uri.encodeSpecialChars_ = function(unescapedPart, extra,
+    opt_removeDoubleEncoding) {
+  if (goog.isString(unescapedPart)) {
+    var encoded = encodeURI(unescapedPart).
+        replace(extra, goog.Uri.encodeChar_);
+    if (opt_removeDoubleEncoding) {
+      // encodeURI double-escapes %XX sequences used to represent restricted
+      // characters in some URI components, remove the double escaping here.
+      encoded = goog.Uri.removeDoubleEncoding_(encoded);
+    }
+    return encoded;
+  }
+  return null;
+};
+
+
+/**
+ * Converts a character in [\01-\177] to its unicode character equivalent.
+ * @param {string} ch One character string.
+ * @return {string} Encoded string.
+ * @private
+ */
+goog.Uri.encodeChar_ = function(ch) {
+  var n = ch.charCodeAt(0);
+  return '%' + ((n >> 4) & 0xf).toString(16) + (n & 0xf).toString(16);
+};
+
+
+/**
+ * Removes double percent-encoding from a string.
+ * @param  {string} doubleEncodedString String
+ * @return {string} String with double encoding removed.
+ * @private
+ */
+goog.Uri.removeDoubleEncoding_ = function(doubleEncodedString) {
+  return doubleEncodedString.replace(/%25([0-9a-fA-F]{2})/g, '%$1');
+};
+
+
+/**
+ * Regular expression for characters that are disallowed in the scheme or
+ * userInfo part of the URI.
+ * @type {RegExp}
+ * @private
+ */
+goog.Uri.reDisallowedInSchemeOrUserInfo_ = /[#\/\?@]/g;
+
+
+/**
+ * Regular expression for characters that are disallowed in a relative path.
+ * Colon is included due to RFC 3986 3.3.
+ * @type {RegExp}
+ * @private
+ */
+goog.Uri.reDisallowedInRelativePath_ = /[\#\?:]/g;
+
+
+/**
+ * Regular expression for characters that are disallowed in an absolute path.
+ * @type {RegExp}
+ * @private
+ */
+goog.Uri.reDisallowedInAbsolutePath_ = /[\#\?]/g;
+
+
+/**
+ * Regular expression for characters that are disallowed in the query.
+ * @type {RegExp}
+ * @private
+ */
+goog.Uri.reDisallowedInQuery_ = /[\#\?@]/g;
+
+
+/**
+ * Regular expression for characters that are disallowed in the fragment.
+ * @type {RegExp}
+ * @private
+ */
+goog.Uri.reDisallowedInFragment_ = /#/g;
+
+
+/**
+ * Checks whether two URIs have the same domain.
+ * @param {string} uri1String First URI string.
+ * @param {string} uri2String Second URI string.
+ * @return {boolean} true if the two URIs have the same domain; false otherwise.
+ */
+goog.Uri.haveSameDomain = function(uri1String, uri2String) {
+  // Differs from goog.uri.utils.haveSameDomain, since this ignores scheme.
+  // TODO(gboyer): Have this just call goog.uri.util.haveSameDomain.
+  var pieces1 = goog.uri.utils.split(uri1String);
+  var pieces2 = goog.uri.utils.split(uri2String);
+  return pieces1[goog.uri.utils.ComponentIndex.DOMAIN] ==
+             pieces2[goog.uri.utils.ComponentIndex.DOMAIN] &&
+         pieces1[goog.uri.utils.ComponentIndex.PORT] ==
+             pieces2[goog.uri.utils.ComponentIndex.PORT];
+};
+
+
+
+/**
+ * Class used to represent URI query parameters.  It is essentially a hash of
+ * name-value pairs, though a name can be present more than once.
+ *
+ * Has the same interface as the collections in goog.structs.
+ *
+ * @param {?string=} opt_query Optional encoded query string to parse into
+ *     the object.
+ * @param {goog.Uri=} opt_uri Optional uri object that should have its
+ *     cache invalidated when this object updates. Deprecated -- this
+ *     is no longer required.
+ * @param {boolean=} opt_ignoreCase If true, ignore the case of the parameter
+ *     name in #get.
+ * @constructor
+ * @struct
+ * @final
+ */
+goog.Uri.QueryData = function(opt_query, opt_uri, opt_ignoreCase) {
+  /**
+   * The map containing name/value or name/array-of-values pairs.
+   * May be null if it requires parsing from the query string.
+   *
+   * We need to use a Map because we cannot guarantee that the key names will
+   * not be problematic for IE.
+   *
+   * @private {goog.structs.Map<string, !Array<*>>}
+   */
+  this.keyMap_ = null;
+
+  /**
+   * The number of params, or null if it requires computing.
+   * @private {?number}
+   */
+  this.count_ = null;
+
+  /**
+   * Encoded query string, or null if it requires computing from the key map.
+   * @private {?string}
+   */
+  this.encodedQuery_ = opt_query || null;
+
+  /**
+   * If true, ignore the case of the parameter name in #get.
+   * @private {boolean}
+   */
+  this.ignoreCase_ = !!opt_ignoreCase;
+};
+
+
+/**
+ * If the underlying key map is not yet initialized, it parses the
+ * query string and fills the map with parsed data.
+ * @private
+ */
+goog.Uri.QueryData.prototype.ensureKeyMapInitialized_ = function() {
+  if (!this.keyMap_) {
+    this.keyMap_ = new goog.structs.Map();
+    this.count_ = 0;
+    if (this.encodedQuery_) {
+      var self = this;
+      goog.uri.utils.parseQueryData(this.encodedQuery_, function(name, value) {
+        self.add(goog.string.urlDecode(name), value);
+      });
+    }
+  }
+};
+
+
+/**
+ * Creates a new query data instance from a map of names and values.
+ *
+ * @param {!goog.structs.Map<string, ?>|!Object} map Map of string parameter
+ *     names to parameter value. If parameter value is an array, it is
+ *     treated as if the key maps to each individual value in the
+ *     array.
+ * @param {goog.Uri=} opt_uri URI object that should have its cache
+ *     invalidated when this object updates.
+ * @param {boolean=} opt_ignoreCase If true, ignore the case of the parameter
+ *     name in #get.
+ * @return {!goog.Uri.QueryData} The populated query data instance.
+ */
+goog.Uri.QueryData.createFromMap = function(map, opt_uri, opt_ignoreCase) {
+  var keys = goog.structs.getKeys(map);
+  if (typeof keys == 'undefined') {
+    throw Error('Keys are undefined');
+  }
+
+  var queryData = new goog.Uri.QueryData(null, null, opt_ignoreCase);
+  var values = goog.structs.getValues(map);
+  for (var i = 0; i < keys.length; i++) {
+    var key = keys[i];
+    var value = values[i];
+    if (!goog.isArray(value)) {
+      queryData.add(key, value);
+    } else {
+      queryData.setValues(key, value);
+    }
+  }
+  return queryData;
+};
+
+
+/**
+ * Creates a new query data instance from parallel arrays of parameter names
+ * and values. Allows for duplicate parameter names. Throws an error if the
+ * lengths of the arrays differ.
+ *
+ * @param {!Array<string>} keys Parameter names.
+ * @param {!Array<?>} values Parameter values.
+ * @param {goog.Uri=} opt_uri URI object that should have its cache
+ *     invalidated when this object updates.
+ * @param {boolean=} opt_ignoreCase If true, ignore the case of the parameter
+ *     name in #get.
+ * @return {!goog.Uri.QueryData} The populated query data instance.
+ */
+goog.Uri.QueryData.createFromKeysValues = function(
+    keys, values, opt_uri, opt_ignoreCase) {
+  if (keys.length != values.length) {
+    throw Error('Mismatched lengths for keys/values');
+  }
+  var queryData = new goog.Uri.QueryData(null, null, opt_ignoreCase);
+  for (var i = 0; i < keys.length; i++) {
+    queryData.add(keys[i], values[i]);
+  }
+  return queryData;
+};
+
+
+/**
+ * @return {?number} The number of parameters.
+ */
+goog.Uri.QueryData.prototype.getCount = function() {
+  this.ensureKeyMapInitialized_();
+  return this.count_;
+};
+
+
+/**
+ * Adds a key value pair.
+ * @param {string} key Name.
+ * @param {*} value Value.
+ * @return {!goog.Uri.QueryData} Instance of this object.
+ */
+goog.Uri.QueryData.prototype.add = function(key, value) {
+  this.ensureKeyMapInitialized_();
+  this.invalidateCache_();
+
+  key = this.getKeyName_(key);
+  var values = this.keyMap_.get(key);
+  if (!values) {
+    this.keyMap_.set(key, (values = []));
+  }
+  values.push(value);
+  this.count_++;
+  return this;
+};
+
+
+/**
+ * Removes all the params with the given key.
+ * @param {string} key Name.
+ * @return {boolean} Whether any parameter was removed.
+ */
+goog.Uri.QueryData.prototype.remove = function(key) {
+  this.ensureKeyMapInitialized_();
+
+  key = this.getKeyName_(key);
+  if (this.keyMap_.containsKey(key)) {
+    this.invalidateCache_();
+
+    // Decrement parameter count.
+    this.count_ -= this.keyMap_.get(key).length;
+    return this.keyMap_.remove(key);
+  }
+  return false;
+};
+
+
+/**
+ * Clears the parameters.
+ */
+goog.Uri.QueryData.prototype.clear = function() {
+  this.invalidateCache_();
+  this.keyMap_ = null;
+  this.count_ = 0;
+};
+
+
+/**
+ * @return {boolean} Whether we have any parameters.
+ */
+goog.Uri.QueryData.prototype.isEmpty = function() {
+  this.ensureKeyMapInitialized_();
+  return this.count_ == 0;
+};
+
+
+/**
+ * Whether there is a parameter with the given name
+ * @param {string} key The parameter name to check for.
+ * @return {boolean} Whether there is a parameter with the given name.
+ */
+goog.Uri.QueryData.prototype.containsKey = function(key) {
+  this.ensureKeyMapInitialized_();
+  key = this.getKeyName_(key);
+  return this.keyMap_.containsKey(key);
+};
+
+
+/**
+ * Whether there is a parameter with the given value.
+ * @param {*} value The value to check for.
+ * @return {boolean} Whether there is a parameter with the given value.
+ */
+goog.Uri.QueryData.prototype.containsValue = function(value) {
+  // NOTE(arv): This solution goes through all the params even if it was the
+  // first param. We can get around this by not reusing code or by switching to
+  // iterators.
+  var vals = this.getValues();
+  return goog.array.contains(vals, value);
+};
+
+
+/**
+ * Returns all the keys of the parameters. If a key is used multiple times
+ * it will be included multiple times in the returned array
+ * @return {!Array<string>} All the keys of the parameters.
+ */
+goog.Uri.QueryData.prototype.getKeys = function() {
+  this.ensureKeyMapInitialized_();
+  // We need to get the values to know how many keys to add.
+  var vals = /** @type {!Array<*>} */ (this.keyMap_.getValues());
+  var keys = this.keyMap_.getKeys();
+  var rv = [];
+  for (var i = 0; i < keys.length; i++) {
+    var val = vals[i];
+    for (var j = 0; j < val.length; j++) {
+      rv.push(keys[i]);
+    }
+  }
+  return rv;
+};
+
+
+/**
+ * Returns all the values of the parameters with the given name. If the query
+ * data has no such key this will return an empty array. If no key is given
+ * all values wil be returned.
+ * @param {string=} opt_key The name of the parameter to get the values for.
+ * @return {!Array<?>} All the values of the parameters with the given name.
+ */
+goog.Uri.QueryData.prototype.getValues = function(opt_key) {
+  this.ensureKeyMapInitialized_();
+  var rv = [];
+  if (goog.isString(opt_key)) {
+    if (this.containsKey(opt_key)) {
+      rv = goog.array.concat(rv, this.keyMap_.get(this.getKeyName_(opt_key)));
+    }
+  } else {
+    // Return all values.
+    var values = this.keyMap_.getValues();
+    for (var i = 0; i < values.length; i++) {
+      rv = goog.array.concat(rv, values[i]);
+    }
+  }
+  return rv;
+};
+
+
+/**
+ * Sets a key value pair and removes all other keys with the same value.
+ *
+ * @param {string} key Name.
+ * @param {*} value Value.
+ * @return {!goog.Uri.QueryData} Instance of this object.
+ */
+goog.Uri.QueryData.prototype.set = function(key, value) {
+  this.ensureKeyMapInitialized_();
+  this.invalidateCache_();
+
+  // TODO(chrishenry): This could be better written as
+  // this.remove(key), this.add(key, value), but that would reorder
+  // the key (since the key is first removed and then added at the
+  // end) and we would have to fix unit tests that depend on key
+  // ordering.
+  key = this.getKeyName_(key);
+  if (this.containsKey(key)) {
+    this.count_ -= this.keyMap_.get(key).length;
+  }
+  this.keyMap_.set(key, [value]);
+  this.count_++;
+  return this;
+};
+
+
+/**
+ * Returns the first value associated with the key. If the query data has no
+ * such key this will return undefined or the optional default.
+ * @param {string} key The name of the parameter to get the value for.
+ * @param {*=} opt_default The default value to return if the query data
+ *     has no such key.
+ * @return {*} The first string value associated with the key, or opt_default
+ *     if there's no value.
+ */
+goog.Uri.QueryData.prototype.get = function(key, opt_default) {
+  var values = key ? this.getValues(key) : [];
+  if (goog.Uri.preserveParameterTypesCompatibilityFlag) {
+    return values.length > 0 ? values[0] : opt_default;
+  } else {
+    return values.length > 0 ? String(values[0]) : opt_default;
+  }
+};
+
+
+/**
+ * Sets the values for a key. If the key already exists, this will
+ * override all of the existing values that correspond to the key.
+ * @param {string} key The key to set values for.
+ * @param {!Array<?>} values The values to set.
+ */
+goog.Uri.QueryData.prototype.setValues = function(key, values) {
+  this.remove(key);
+
+  if (values.length > 0) {
+    this.invalidateCache_();
+    this.keyMap_.set(this.getKeyName_(key), goog.array.clone(values));
+    this.count_ += values.length;
+  }
+};
+
+
+/**
+ * @return {string} Encoded query string.
+ * @override
+ */
+goog.Uri.QueryData.prototype.toString = function() {
+  if (this.encodedQuery_) {
+    return this.encodedQuery_;
+  }
+
+  if (!this.keyMap_) {
+    return '';
+  }
+
+  var sb = [];
+
+  // In the past, we use this.getKeys() and this.getVals(), but that
+  // generates a lot of allocations as compared to simply iterating
+  // over the keys.
+  var keys = this.keyMap_.getKeys();
+  for (var i = 0; i < keys.length; i++) {
+    var key = keys[i];
+    var encodedKey = goog.string.urlEncode(key);
+    var val = this.getValues(key);
+    for (var j = 0; j < val.length; j++) {
+      var param = encodedKey;
+      // Ensure that null and undefined are encoded into the url as
+      // literal strings.
+      if (val[j] !== '') {
+        param += '=' + goog.string.urlEncode(val[j]);
+      }
+      sb.push(param);
+    }
+  }
+
+  return this.encodedQuery_ = sb.join('&');
+};
+
+
+/**
+ * @throws URIError If URI is malformed (that is, if decodeURIComponent fails on
+ *     any of the URI components).
+ * @return {string} Decoded query string.
+ */
+goog.Uri.QueryData.prototype.toDecodedString = function() {
+  return goog.Uri.decodeOrEmpty_(this.toString());
+};
+
+
+/**
+ * Invalidate the cache.
+ * @private
+ */
+goog.Uri.QueryData.prototype.invalidateCache_ = function() {
+  this.encodedQuery_ = null;
+};
+
+
+/**
+ * Removes all keys that are not in the provided list. (Modifies this object.)
+ * @param {Array<string>} keys The desired keys.
+ * @return {!goog.Uri.QueryData} a reference to this object.
+ */
+goog.Uri.QueryData.prototype.filterKeys = function(keys) {
+  this.ensureKeyMapInitialized_();
+  this.keyMap_.forEach(
+      function(value, key) {
+        if (!goog.array.contains(keys, key)) {
+          this.remove(key);
+        }
+      }, this);
+  return this;
+};
+
+
+/**
+ * Clone the query data instance.
+ * @return {!goog.Uri.QueryData} New instance of the QueryData object.
+ */
+goog.Uri.QueryData.prototype.clone = function() {
+  var rv = new goog.Uri.QueryData();
+  rv.encodedQuery_ = this.encodedQuery_;
+  if (this.keyMap_) {
+    rv.keyMap_ = this.keyMap_.clone();
+    rv.count_ = this.count_;
+  }
+  return rv;
+};
+
+
+/**
+ * Helper function to get the key name from a JavaScript object. Converts
+ * the object to a string, and to lower case if necessary.
+ * @private
+ * @param {*} arg The object to get a key name from.
+ * @return {string} valid key name which can be looked up in #keyMap_.
+ */
+goog.Uri.QueryData.prototype.getKeyName_ = function(arg) {
+  var keyName = String(arg);
+  if (this.ignoreCase_) {
+    keyName = keyName.toLowerCase();
+  }
+  return keyName;
+};
+
+
+/**
+ * Ignore case in parameter names.
+ * NOTE: If there are already key/value pairs in the QueryData, and
+ * ignoreCase_ is set to false, the keys will all be lower-cased.
+ * @param {boolean} ignoreCase whether this goog.Uri should ignore case.
+ */
+goog.Uri.QueryData.prototype.setIgnoreCase = function(ignoreCase) {
+  var resetKeys = ignoreCase && !this.ignoreCase_;
+  if (resetKeys) {
+    this.ensureKeyMapInitialized_();
+    this.invalidateCache_();
+    this.keyMap_.forEach(
+        function(value, key) {
+          var lowerCase = key.toLowerCase();
+          if (key != lowerCase) {
+            this.remove(key);
+            this.setValues(lowerCase, value);
+          }
+        }, this);
+  }
+  this.ignoreCase_ = ignoreCase;
+};
+
+
+/**
+ * Extends a query data object with another query data or map like object. This
+ * operates 'in-place', it does not create a new QueryData object.
+ *
+ * @param {...(goog.Uri.QueryData|goog.structs.Map<?, ?>|Object)} var_args
+ *     The object from which key value pairs will be copied.
+ */
+goog.Uri.QueryData.prototype.extend = function(var_args) {
+  for (var i = 0; i < arguments.length; i++) {
+    var data = arguments[i];
+    goog.structs.forEach(data,
+        /** @this {goog.Uri.QueryData} */
+        function(value, key) {
+          this.add(key, value);
+        }, this);
+  }
+};
+
+goog.provide('ol.style.Text');
+
+
+goog.require('ol.style.Fill');
+
+
+
+/**
+ * @classdesc
+ * Set text style for vector features.
+ *
+ * @constructor
+ * @param {olx.style.TextOptions=} opt_options Options.
+ * @api
+ */
+ol.style.Text = function(opt_options) {
+
+  var options = opt_options || {};
+
+  /**
+   * @private
+   * @type {string|undefined}
+   */
+  this.font_ = options.font;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.rotation_ = options.rotation;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.scale_ = options.scale;
+
+  /**
+   * @private
+   * @type {string|undefined}
+   */
+  this.text_ = options.text;
+
+  /**
+   * @private
+   * @type {string|undefined}
+   */
+  this.textAlign_ = options.textAlign;
+
+  /**
+   * @private
+   * @type {string|undefined}
+   */
+  this.textBaseline_ = options.textBaseline;
+
+  /**
+   * @private
+   * @type {ol.style.Fill}
+   */
+  this.fill_ = options.fill !== undefined ? options.fill :
+      new ol.style.Fill({color: ol.style.Text.DEFAULT_FILL_COLOR_});
+
+  /**
+   * @private
+   * @type {ol.style.Stroke}
+   */
+  this.stroke_ = options.stroke !== undefined ? options.stroke : null;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.offsetX_ = options.offsetX !== undefined ? options.offsetX : 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.offsetY_ = options.offsetY !== undefined ? options.offsetY : 0;
+};
+
+
+/**
+ * The default fill color to use if no fill was set at construction time; a
+ * blackish `#333`.
+ *
+ * @const {string}
+ * @private
+ */
+ol.style.Text.DEFAULT_FILL_COLOR_ = '#333';
+
+
+/**
+ * Get the font name.
+ * @return {string|undefined} Font.
+ * @api
+ */
+ol.style.Text.prototype.getFont = function() {
+  return this.font_;
+};
+
+
+/**
+ * Get the x-offset for the text.
+ * @return {number} Horizontal text offset.
+ * @api
+ */
+ol.style.Text.prototype.getOffsetX = function() {
+  return this.offsetX_;
+};
+
+
+/**
+ * Get the y-offset for the text.
+ * @return {number} Vertical text offset.
+ * @api
+ */
+ol.style.Text.prototype.getOffsetY = function() {
+  return this.offsetY_;
+};
+
+
+/**
+ * Get the fill style for the text.
+ * @return {ol.style.Fill} Fill style.
+ * @api
+ */
+ol.style.Text.prototype.getFill = function() {
+  return this.fill_;
+};
+
+
+/**
+ * Get the text rotation.
+ * @return {number|undefined} Rotation.
+ * @api
+ */
+ol.style.Text.prototype.getRotation = function() {
+  return this.rotation_;
+};
+
+
+/**
+ * Get the text scale.
+ * @return {number|undefined} Scale.
+ * @api
+ */
+ol.style.Text.prototype.getScale = function() {
+  return this.scale_;
+};
+
+
+/**
+ * Get the stroke style for the text.
+ * @return {ol.style.Stroke} Stroke style.
+ * @api
+ */
+ol.style.Text.prototype.getStroke = function() {
+  return this.stroke_;
+};
+
+
+/**
+ * Get the text to be rendered.
+ * @return {string|undefined} Text.
+ * @api
+ */
+ol.style.Text.prototype.getText = function() {
+  return this.text_;
+};
+
+
+/**
+ * Get the text alignment.
+ * @return {string|undefined} Text align.
+ * @api
+ */
+ol.style.Text.prototype.getTextAlign = function() {
+  return this.textAlign_;
+};
+
+
+/**
+ * Get the text baseline.
+ * @return {string|undefined} Text baseline.
+ * @api
+ */
+ol.style.Text.prototype.getTextBaseline = function() {
+  return this.textBaseline_;
+};
+
+
+/**
+ * Set the font.
+ *
+ * @param {string|undefined} font Font.
+ * @api
+ */
+ol.style.Text.prototype.setFont = function(font) {
+  this.font_ = font;
+};
+
+
+/**
+ * Set the x offset.
+ *
+ * @param {number} offsetX Horizontal text offset.
+ * @api
+ */
+ol.style.Text.prototype.setOffsetX = function(offsetX) {
+  this.offsetX_ = offsetX;
+};
+
+
+/**
+ * Set the y offset.
+ *
+ * @param {number} offsetY Vertical text offset.
+ * @api
+ */
+ol.style.Text.prototype.setOffsetY = function(offsetY) {
+  this.offsetY_ = offsetY;
+};
+
+
+/**
+ * Set the fill.
+ *
+ * @param {ol.style.Fill} fill Fill style.
+ * @api
+ */
+ol.style.Text.prototype.setFill = function(fill) {
+  this.fill_ = fill;
+};
+
+
+/**
+ * Set the rotation.
+ *
+ * @param {number|undefined} rotation Rotation.
+ * @api
+ */
+ol.style.Text.prototype.setRotation = function(rotation) {
+  this.rotation_ = rotation;
+};
+
+
+/**
+ * Set the scale.
+ *
+ * @param {number|undefined} scale Scale.
+ * @api
+ */
+ol.style.Text.prototype.setScale = function(scale) {
+  this.scale_ = scale;
+};
+
+
+/**
+ * Set the stroke.
+ *
+ * @param {ol.style.Stroke} stroke Stroke style.
+ * @api
+ */
+ol.style.Text.prototype.setStroke = function(stroke) {
+  this.stroke_ = stroke;
+};
+
+
+/**
+ * Set the text.
+ *
+ * @param {string|undefined} text Text.
+ * @api
+ */
+ol.style.Text.prototype.setText = function(text) {
+  this.text_ = text;
+};
+
+
+/**
+ * Set the text alignment.
+ *
+ * @param {string|undefined} textAlign Text align.
+ * @api
+ */
+ol.style.Text.prototype.setTextAlign = function(textAlign) {
+  this.textAlign_ = textAlign;
+};
+
+
+/**
+ * Set the text baseline.
+ *
+ * @param {string|undefined} textBaseline Text baseline.
+ * @api
+ */
+ol.style.Text.prototype.setTextBaseline = function(textBaseline) {
+  this.textBaseline_ = textBaseline;
+};
+
+// FIXME http://earth.google.com/kml/1.0 namespace?
+// FIXME why does node.getAttribute return an unknown type?
+// FIXME text
+// FIXME serialize arbitrary feature properties
+// FIXME don't parse style if extractStyles is false
+
+goog.provide('ol.format.KML');
+
+goog.require('goog.Uri');
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.dom.NodeType');
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.Feature');
+goog.require('ol.FeatureStyleFunction');
+goog.require('ol.array');
+goog.require('ol.color');
+goog.require('ol.format.Feature');
+goog.require('ol.format.XMLFeature');
+goog.require('ol.format.XSD');
+goog.require('ol.geom.Geometry');
+goog.require('ol.geom.GeometryCollection');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.GeometryType');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.LinearRing');
+goog.require('ol.geom.MultiLineString');
+goog.require('ol.geom.MultiPoint');
+goog.require('ol.geom.MultiPolygon');
+goog.require('ol.geom.Point');
+goog.require('ol.geom.Polygon');
+goog.require('ol.math');
+goog.require('ol.proj');
+goog.require('ol.style.Fill');
+goog.require('ol.style.Icon');
+goog.require('ol.style.IconAnchorUnits');
+goog.require('ol.style.IconOrigin');
+goog.require('ol.style.Image');
+goog.require('ol.style.Stroke');
+goog.require('ol.style.Style');
+goog.require('ol.style.Text');
+goog.require('ol.xml');
+
+
+/**
+ * @typedef {{x: number, xunits: (ol.style.IconAnchorUnits|undefined),
+ *            y: number, yunits: (ol.style.IconAnchorUnits|undefined)}}
+ */
+ol.format.KMLVec2_;
+
+
+/**
+ * @typedef {{flatCoordinates: Array.<number>,
+ *            whens: Array.<number>}}
+ */
+ol.format.KMLGxTrackObject_;
+
+
+
+/**
+ * @classdesc
+ * Feature format for reading and writing data in the KML format.
+ *
+ * @constructor
+ * @extends {ol.format.XMLFeature}
+ * @param {olx.format.KMLOptions=} opt_options Options.
+ * @api stable
+ */
+ol.format.KML = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  goog.base(this);
+
+  /**
+   * @inheritDoc
+   */
+  this.defaultDataProjection = ol.proj.get('EPSG:4326');
+
+  /**
+   * @private
+   * @type {Array.<ol.style.Style>}
+   */
+  this.defaultStyle_ = options.defaultStyle ?
+      options.defaultStyle : ol.format.KML.DEFAULT_STYLE_ARRAY_;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.extractStyles_ = options.extractStyles !== undefined ?
+      options.extractStyles : true;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.writeStyles_ = options.writeStyles !== undefined ?
+      options.writeStyles : true;
+
+  /**
+   * @private
+   * @type {Object.<string, (Array.<ol.style.Style>|string)>}
+   */
+  this.sharedStyles_ = {};
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.showPointNames_ = options.showPointNames !== undefined ?
+      options.showPointNames : true;
+
+};
+goog.inherits(ol.format.KML, ol.format.XMLFeature);
+
+
+/**
+ * @const
+ * @type {Array.<string>}
+ * @private
+ */
+ol.format.KML.EXTENSIONS_ = ['.kml'];
+
+
+/**
+ * @const
+ * @type {Array.<string>}
+ * @private
+ */
+ol.format.KML.GX_NAMESPACE_URIS_ = [
+  'http://www.google.com/kml/ext/2.2'
+];
+
+
+/**
+ * @const
+ * @type {Array.<string>}
+ * @private
+ */
+ol.format.KML.NAMESPACE_URIS_ = [
+  null,
+  'http://earth.google.com/kml/2.0',
+  'http://earth.google.com/kml/2.1',
+  'http://earth.google.com/kml/2.2',
+  'http://www.opengis.net/kml/2.2'
+];
+
+
+/**
+ * @const
+ * @type {string}
+ * @private
+ */
+ol.format.KML.SCHEMA_LOCATION_ = 'http://www.opengis.net/kml/2.2 ' +
+    'https://developers.google.com/kml/schema/kml22gx.xsd';
+
+
+/**
+ * @const
+ * @type {ol.Color}
+ * @private
+ */
+ol.format.KML.DEFAULT_COLOR_ = [255, 255, 255, 1];
+
+
+/**
+ * @const
+ * @type {ol.style.Fill}
+ * @private
+ */
+ol.format.KML.DEFAULT_FILL_STYLE_ = new ol.style.Fill({
+  color: ol.format.KML.DEFAULT_COLOR_
+});
+
+
+/**
+ * @const
+ * @type {ol.Size}
+ * @private
+ */
+ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_ = [20, 2]; // FIXME maybe [8, 32] ?
+
+
+/**
+ * @const
+ * @type {ol.style.IconAnchorUnits}
+ * @private
+ */
+ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_X_UNITS_ =
+    ol.style.IconAnchorUnits.PIXELS;
+
+
+/**
+ * @const
+ * @type {ol.style.IconAnchorUnits}
+ * @private
+ */
+ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_Y_UNITS_ =
+    ol.style.IconAnchorUnits.PIXELS;
+
+
+/**
+ * @const
+ * @type {ol.Size}
+ * @private
+ */
+ol.format.KML.DEFAULT_IMAGE_STYLE_SIZE_ = [64, 64];
+
+
+/**
+ * @const
+ * @type {string}
+ * @private
+ */
+ol.format.KML.DEFAULT_IMAGE_STYLE_SRC_ =
+    'https://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png';
+
+
+/**
+ * @const
+ * @type {number}
+ * @private
+ */
+ol.format.KML.DEFAULT_IMAGE_SCALE_MULTIPLIER_ = 0.5;
+
+
+/**
+ * @const
+ * @type {ol.style.Image}
+ * @private
+ */
+ol.format.KML.DEFAULT_IMAGE_STYLE_ = new ol.style.Icon({
+  anchor: ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_,
+  anchorOrigin: ol.style.IconOrigin.BOTTOM_LEFT,
+  anchorXUnits: ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_X_UNITS_,
+  anchorYUnits: ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_Y_UNITS_,
+  crossOrigin: 'anonymous',
+  rotation: 0,
+  scale: ol.format.KML.DEFAULT_IMAGE_SCALE_MULTIPLIER_,
+  size: ol.format.KML.DEFAULT_IMAGE_STYLE_SIZE_,
+  src: ol.format.KML.DEFAULT_IMAGE_STYLE_SRC_
+});
+
+
+/**
+ * @const
+ * @type {ol.style.Stroke}
+ * @private
+ */
+ol.format.KML.DEFAULT_STROKE_STYLE_ = new ol.style.Stroke({
+  color: ol.format.KML.DEFAULT_COLOR_,
+  width: 1
+});
+
+
+/**
+ * @const
+ * @type {ol.style.Stroke}
+ * @private
+ */
+ol.format.KML.DEFAULT_TEXT_STROKE_STYLE_ = new ol.style.Stroke({
+  color: [51, 51, 51, 1],
+  width: 2
+});
+
+
+/**
+ * @const
+ * @type {ol.style.Text}
+ * @private
+ */
+ol.format.KML.DEFAULT_TEXT_STYLE_ = new ol.style.Text({
+  font: 'bold 16px Helvetica',
+  fill: ol.format.KML.DEFAULT_FILL_STYLE_,
+  stroke: ol.format.KML.DEFAULT_TEXT_STROKE_STYLE_,
+  scale: 0.8
+});
+
+
+/**
+ * @const
+ * @type {ol.style.Style}
+ * @private
+ */
+ol.format.KML.DEFAULT_STYLE_ = new ol.style.Style({
+  fill: ol.format.KML.DEFAULT_FILL_STYLE_,
+  image: ol.format.KML.DEFAULT_IMAGE_STYLE_,
+  text: ol.format.KML.DEFAULT_TEXT_STYLE_,
+  stroke: ol.format.KML.DEFAULT_STROKE_STYLE_,
+  zIndex: 0
+});
+
+
+/**
+ * @const
+ * @type {Array.<ol.style.Style>}
+ * @private
+ */
+ol.format.KML.DEFAULT_STYLE_ARRAY_ = [ol.format.KML.DEFAULT_STYLE_];
+
+
+/**
+ * @const
+ * @type {Object.<string, ol.style.IconAnchorUnits>}
+ * @private
+ */
+ol.format.KML.ICON_ANCHOR_UNITS_MAP_ = {
+  'fraction': ol.style.IconAnchorUnits.FRACTION,
+  'pixels': ol.style.IconAnchorUnits.PIXELS
+};
+
+
+/**
+ * @param {ol.style.Style|undefined} foundStyle Style.
+ * @param {string} name Name.
+ * @return {ol.style.Style} style Style.
+ * @private
+ */
+ol.format.KML.createNameStyleFunction_ = function(foundStyle, name) {
+  /** @type {?ol.style.Text} */
+  var textStyle = null;
+  var textOffset = [0, 0];
+  var textAlign = 'start';
+  if (foundStyle.getImage()) {
+    var imageSize = foundStyle.getImage().getImageSize();
+    if (imageSize && imageSize.length == 2) {
+      // Offset the label to be centered to the right of the icon, if there is
+      // one.
+      textOffset[0] = foundStyle.getImage().getScale() * imageSize[0] / 2;
+      textOffset[1] = -foundStyle.getImage().getScale() * imageSize[1] / 2;
+      textAlign = 'left';
+    }
+  }
+  if (!goog.object.isEmpty(foundStyle.getText())) {
+    textStyle = /** @type {ol.style.Text} */
+        (goog.object.clone(foundStyle.getText()));
+    textStyle.setText(name);
+    textStyle.setTextAlign(textAlign);
+    textStyle.setOffsetX(textOffset[0]);
+    textStyle.setOffsetY(textOffset[1]);
+  } else {
+    textStyle = new ol.style.Text({
+      text: name,
+      offsetX: textOffset[0],
+      offsetY: textOffset[1],
+      textAlign: textAlign
+    });
+  }
+  var nameStyle = new ol.style.Style({
+    text: textStyle
+  });
+  return nameStyle;
+};
+
+
+/**
+ * @param {Array.<ol.style.Style>|undefined} style Style.
+ * @param {string} styleUrl Style URL.
+ * @param {Array.<ol.style.Style>} defaultStyle Default style.
+ * @param {Object.<string, (Array.<ol.style.Style>|string)>} sharedStyles Shared
+ *          styles.
+ * @param {boolean|undefined} showPointNames true to show names for point
+ *          placemarks.
+ * @return {ol.FeatureStyleFunction} Feature style function.
+ * @private
+ */
+ol.format.KML.createFeatureStyleFunction_ = function(style, styleUrl,
+    defaultStyle, sharedStyles, showPointNames) {
+
+  return (
+      /**
+       * @param {number} resolution Resolution.
+       * @return {Array.<ol.style.Style>} Style.
+       * @this {ol.Feature}
+       */
+      function(resolution) {
+        var drawName = showPointNames;
+        /** @type {ol.style.Style|undefined} */
+        var nameStyle;
+        /** @type {string} */
+        var name = '';
+        if (drawName) {
+          if (this.getGeometry()) {
+            drawName = (this.getGeometry().getType() ===
+                        ol.geom.GeometryType.POINT);
+          }
+        }
+
+        if (drawName) {
+          name = /** @type {string} */ (this.getProperties()['name']);
+          drawName = drawName && name;
+        }
+
+        if (style) {
+          if (drawName) {
+            nameStyle = ol.format.KML.createNameStyleFunction_(style[0],
+                name);
+            return style.concat(nameStyle);
+          }
+          return style;
+        }
+        if (styleUrl) {
+          var foundStyle = ol.format.KML.findStyle_(styleUrl, defaultStyle,
+              sharedStyles);
+          if (drawName) {
+            nameStyle = ol.format.KML.createNameStyleFunction_(foundStyle[0],
+                name);
+            return foundStyle.concat(nameStyle);
+          }
+          return foundStyle;
+        }
+        if (drawName) {
+          nameStyle = ol.format.KML.createNameStyleFunction_(defaultStyle[0],
+              name);
+          return defaultStyle.concat(nameStyle);
+        }
+        return defaultStyle;
+      });
+};
+
+
+/**
+ * @param {Array.<ol.style.Style>|string|undefined} styleValue Style value.
+ * @param {Array.<ol.style.Style>} defaultStyle Default style.
+ * @param {Object.<string, (Array.<ol.style.Style>|string)>} sharedStyles
+ * Shared styles.
+ * @return {Array.<ol.style.Style>} Style.
+ * @private
+ */
+ol.format.KML.findStyle_ = function(styleValue, defaultStyle, sharedStyles) {
+  if (goog.isArray(styleValue)) {
+    return styleValue;
+  } else if (goog.isString(styleValue)) {
+    // KML files in the wild occasionally forget the leading `#` on styleUrls
+    // defined in the same document.  Add a leading `#` if it enables to find
+    // a style.
+    if (!(styleValue in sharedStyles) && ('#' + styleValue in sharedStyles)) {
+      styleValue = '#' + styleValue;
+    }
+    return ol.format.KML.findStyle_(
+        sharedStyles[styleValue], defaultStyle, sharedStyles);
+  } else {
+    return defaultStyle;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @private
+ * @return {ol.Color|undefined} Color.
+ */
+ol.format.KML.readColor_ = function(node) {
+  var s = ol.xml.getAllTextContent(node, false);
+  // The KML specification states that colors should not include a leading `#`
+  // but we tolerate them.
+  var m = /^\s*#?\s*([0-9A-Fa-f]{8})\s*$/.exec(s);
+  if (m) {
+    var hexColor = m[1];
+    return [
+      parseInt(hexColor.substr(6, 2), 16),
+      parseInt(hexColor.substr(4, 2), 16),
+      parseInt(hexColor.substr(2, 2), 16),
+      parseInt(hexColor.substr(0, 2), 16) / 255
+    ];
+
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @private
+ * @return {Array.<number>|undefined} Flat coordinates.
+ */
+ol.format.KML.readFlatCoordinates_ = function(node) {
+  var s = ol.xml.getAllTextContent(node, false);
+  var flatCoordinates = [];
+  // The KML specification states that coordinate tuples should not include
+  // spaces, but we tolerate them.
+  var re =
+      /^\s*([+\-]?\d*\.?\d+(?:e[+\-]?\d+)?)\s*,\s*([+\-]?\d*\.?\d+(?:e[+\-]?\d+)?)(?:\s*,\s*([+\-]?\d*\.?\d+(?:e[+\-]?\d+)?))?\s*/i;
+  var m;
+  while ((m = re.exec(s))) {
+    var x = parseFloat(m[1]);
+    var y = parseFloat(m[2]);
+    var z = m[3] ? parseFloat(m[3]) : 0;
+    flatCoordinates.push(x, y, z);
+    s = s.substr(m[0].length);
+  }
+  if (s !== '') {
+    return undefined;
+  }
+  return flatCoordinates;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @private
+ * @return {string|undefined} Style URL.
+ */
+ol.format.KML.readStyleUrl_ = function(node) {
+  var s = ol.xml.getAllTextContent(node, false).trim();
+  if (node.baseURI) {
+    return goog.Uri.resolve(node.baseURI, s).toString();
+  } else {
+    return s;
+  }
+
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @private
+ * @return {string} URI.
+ */
+ol.format.KML.readURI_ = function(node) {
+  var s = ol.xml.getAllTextContent(node, false);
+  if (node.baseURI) {
+    return goog.Uri.resolve(node.baseURI, s.trim()).toString();
+  } else {
+    return s.trim();
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @private
+ * @return {ol.format.KMLVec2_} Vec2.
+ */
+ol.format.KML.readVec2_ = function(node) {
+  var xunits = node.getAttribute('xunits');
+  var yunits = node.getAttribute('yunits');
+  return {
+    x: parseFloat(node.getAttribute('x')),
+    xunits: ol.format.KML.ICON_ANCHOR_UNITS_MAP_[xunits],
+    y: parseFloat(node.getAttribute('y')),
+    yunits: ol.format.KML.ICON_ANCHOR_UNITS_MAP_[yunits]
+  };
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @private
+ * @return {number|undefined} Scale.
+ */
+ol.format.KML.readScale_ = function(node) {
+  var number = ol.format.XSD.readDecimal(node);
+  if (number !== undefined) {
+    return Math.sqrt(number);
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Array.<ol.style.Style>|string|undefined} StyleMap.
+ */
+ol.format.KML.readStyleMapValue_ = function(node, objectStack) {
+  return ol.xml.pushParseAndPop(
+      /** @type {Array.<ol.style.Style>|string|undefined} */ (undefined),
+      ol.format.KML.STYLE_MAP_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.IconStyleParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be an ELEMENT');
+  goog.asserts.assert(node.localName == 'IconStyle',
+      'localName should be IconStyle');
+  // FIXME refreshMode
+  // FIXME refreshInterval
+  // FIXME viewRefreshTime
+  // FIXME viewBoundScale
+  // FIXME viewFormat
+  // FIXME httpQuery
+  var object = ol.xml.pushParseAndPop(
+      {}, ol.format.KML.ICON_STYLE_PARSERS_, node, objectStack);
+  if (!object) {
+    return;
+  }
+  var styleObject = /** @type {Object} */ (objectStack[objectStack.length - 1]);
+  goog.asserts.assert(goog.isObject(styleObject),
+      'styleObject should be an Object');
+  var IconObject = 'Icon' in object ? object['Icon'] : {};
+  var src;
+  var href = /** @type {string|undefined} */
+      (IconObject['href']);
+  if (href) {
+    src = href;
+  } else {
+    src = ol.format.KML.DEFAULT_IMAGE_STYLE_SRC_;
+  }
+  var anchor, anchorXUnits, anchorYUnits;
+  var hotSpot = /** @type {ol.format.KMLVec2_|undefined} */
+      (object['hotSpot']);
+  if (hotSpot) {
+    anchor = [hotSpot.x, hotSpot.y];
+    anchorXUnits = hotSpot.xunits;
+    anchorYUnits = hotSpot.yunits;
+  } else if (src === ol.format.KML.DEFAULT_IMAGE_STYLE_SRC_) {
+    anchor = ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_;
+    anchorXUnits = ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_X_UNITS_;
+    anchorYUnits = ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_Y_UNITS_;
+  } else if (/^http:\/\/maps\.(?:google|gstatic)\.com\//.test(src)) {
+    anchor = [0.5, 0];
+    anchorXUnits = ol.style.IconAnchorUnits.FRACTION;
+    anchorYUnits = ol.style.IconAnchorUnits.FRACTION;
+  }
+
+  var offset;
+  var x = /** @type {number|undefined} */
+      (IconObject['x']);
+  var y = /** @type {number|undefined} */
+      (IconObject['y']);
+  if (x !== undefined && y !== undefined) {
+    offset = [x, y];
+  }
+
+  var size;
+  var w = /** @type {number|undefined} */
+      (IconObject['w']);
+  var h = /** @type {number|undefined} */
+      (IconObject['h']);
+  if (w !== undefined && h !== undefined) {
+    size = [w, h];
+  }
+
+  var rotation;
+  var heading = /** @type {number} */
+      (object['heading']);
+  if (heading !== undefined) {
+    rotation = ol.math.toRadians(heading);
+  }
+
+  var scale = /** @type {number|undefined} */
+      (object['scale']);
+  if (src == ol.format.KML.DEFAULT_IMAGE_STYLE_SRC_) {
+    size = ol.format.KML.DEFAULT_IMAGE_STYLE_SIZE_;
+    if (scale === undefined) {
+      scale = ol.format.KML.DEFAULT_IMAGE_SCALE_MULTIPLIER_;
+    }
+  }
+
+  var imageStyle = new ol.style.Icon({
+    anchor: anchor,
+    anchorOrigin: ol.style.IconOrigin.BOTTOM_LEFT,
+    anchorXUnits: anchorXUnits,
+    anchorYUnits: anchorYUnits,
+    crossOrigin: 'anonymous', // FIXME should this be configurable?
+    offset: offset,
+    offsetOrigin: ol.style.IconOrigin.BOTTOM_LEFT,
+    rotation: rotation,
+    scale: scale,
+    size: size,
+    src: src
+  });
+  styleObject['imageStyle'] = imageStyle;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.LabelStyleParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'LabelStyle',
+      'localName should be LabelStyle');
+  // FIXME colorMode
+  var object = ol.xml.pushParseAndPop(
+      {}, ol.format.KML.LABEL_STYLE_PARSERS_, node, objectStack);
+  if (!object) {
+    return;
+  }
+  var styleObject = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(styleObject),
+      'styleObject should be an Object');
+  var textStyle = new ol.style.Text({
+    fill: new ol.style.Fill({
+      color: /** @type {ol.Color} */
+          ('color' in object ? object['color'] : ol.format.KML.DEFAULT_COLOR_)
+    }),
+    scale: /** @type {number|undefined} */
+        (object['scale'])
+  });
+  styleObject['textStyle'] = textStyle;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.LineStyleParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'LineStyle',
+      'localName should be LineStyle');
+  // FIXME colorMode
+  // FIXME gx:outerColor
+  // FIXME gx:outerWidth
+  // FIXME gx:physicalWidth
+  // FIXME gx:labelVisibility
+  var object = ol.xml.pushParseAndPop(
+      {}, ol.format.KML.LINE_STYLE_PARSERS_, node, objectStack);
+  if (!object) {
+    return;
+  }
+  var styleObject = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(styleObject),
+      'styleObject should be an Object');
+  var strokeStyle = new ol.style.Stroke({
+    color: /** @type {ol.Color} */
+        ('color' in object ? object['color'] : ol.format.KML.DEFAULT_COLOR_),
+    width: /** @type {number} */ ('width' in object ? object['width'] : 1)
+  });
+  styleObject['strokeStyle'] = strokeStyle;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.PolyStyleParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'PolyStyle',
+      'localName should be PolyStyle');
+  // FIXME colorMode
+  var object = ol.xml.pushParseAndPop(
+      {}, ol.format.KML.POLY_STYLE_PARSERS_, node, objectStack);
+  if (!object) {
+    return;
+  }
+  var styleObject = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(styleObject),
+      'styleObject should be an Object');
+  var fillStyle = new ol.style.Fill({
+    color: /** @type {ol.Color} */
+        ('color' in object ? object['color'] : ol.format.KML.DEFAULT_COLOR_)
+  });
+  styleObject['fillStyle'] = fillStyle;
+  var fill = /** @type {boolean|undefined} */ (object['fill']);
+  if (fill !== undefined) {
+    styleObject['fill'] = fill;
+  }
+  var outline =
+      /** @type {boolean|undefined} */ (object['outline']);
+  if (outline !== undefined) {
+    styleObject['outline'] = outline;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Array.<number>} LinearRing flat coordinates.
+ */
+ol.format.KML.readFlatLinearRing_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'LinearRing',
+      'localName should be LinearRing');
+  return /** @type {Array.<number>} */ (ol.xml.pushParseAndPop(
+      null, ol.format.KML.FLAT_LINEAR_RING_PARSERS_, node, objectStack));
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.gxCoordParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(ol.array.includes(
+      ol.format.KML.GX_NAMESPACE_URIS_, node.namespaceURI),
+      'namespaceURI of the node should be known to the KML parser');
+  goog.asserts.assert(node.localName == 'coord', 'localName should be coord');
+  var gxTrackObject = /** @type {ol.format.KMLGxTrackObject_} */
+      (objectStack[objectStack.length - 1]);
+  goog.asserts.assert(goog.isObject(gxTrackObject),
+      'gxTrackObject should be an Object');
+  var flatCoordinates = gxTrackObject.flatCoordinates;
+  var s = ol.xml.getAllTextContent(node, false);
+  var re =
+      /^\s*([+\-]?\d+(?:\.\d*)?(?:e[+\-]?\d*)?)\s+([+\-]?\d+(?:\.\d*)?(?:e[+\-]?\d*)?)\s+([+\-]?\d+(?:\.\d*)?(?:e[+\-]?\d*)?)\s*$/i;
+  var m = re.exec(s);
+  if (m) {
+    var x = parseFloat(m[1]);
+    var y = parseFloat(m[2]);
+    var z = parseFloat(m[3]);
+    flatCoordinates.push(x, y, z, 0);
+  } else {
+    flatCoordinates.push(0, 0, 0, 0);
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.geom.MultiLineString|undefined} MultiLineString.
+ */
+ol.format.KML.readGxMultiTrack_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(ol.array.includes(
+      ol.format.KML.GX_NAMESPACE_URIS_, node.namespaceURI),
+      'namespaceURI of the node should be known to the KML parser');
+  goog.asserts.assert(node.localName == 'MultiTrack',
+      'localName should be MultiTrack');
+  var lineStrings = ol.xml.pushParseAndPop(
+      /** @type {Array.<ol.geom.LineString>} */ ([]),
+      ol.format.KML.GX_MULTITRACK_GEOMETRY_PARSERS_, node, objectStack);
+  if (!lineStrings) {
+    return undefined;
+  }
+  var multiLineString = new ol.geom.MultiLineString(null);
+  multiLineString.setLineStrings(lineStrings);
+  return multiLineString;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.geom.LineString|undefined} LineString.
+ */
+ol.format.KML.readGxTrack_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(ol.array.includes(
+      ol.format.KML.GX_NAMESPACE_URIS_, node.namespaceURI),
+      'namespaceURI of the node should be known to the KML parser');
+  goog.asserts.assert(node.localName == 'Track', 'localName should be Track');
+  var gxTrackObject = ol.xml.pushParseAndPop(
+      /** @type {ol.format.KMLGxTrackObject_} */ ({
+        flatCoordinates: [],
+        whens: []
+      }), ol.format.KML.GX_TRACK_PARSERS_, node, objectStack);
+  if (!gxTrackObject) {
+    return undefined;
+  }
+  var flatCoordinates = gxTrackObject.flatCoordinates;
+  var whens = gxTrackObject.whens;
+  goog.asserts.assert(flatCoordinates.length / 4 == whens.length,
+      'the length of the flatCoordinates array divided by 4 should be the ' +
+      'length of the whens array');
+  var i, ii;
+  for (i = 0, ii = Math.min(flatCoordinates.length, whens.length); i < ii;
+       ++i) {
+    flatCoordinates[4 * i + 3] = whens[i];
+  }
+  var lineString = new ol.geom.LineString(null);
+  lineString.setFlatCoordinates(ol.geom.GeometryLayout.XYZM, flatCoordinates);
+  return lineString;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object} Icon object.
+ */
+ol.format.KML.readIcon_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Icon', 'localName should be Icon');
+  var iconObject = ol.xml.pushParseAndPop(
+      {}, ol.format.KML.ICON_PARSERS_, node, objectStack);
+  if (iconObject) {
+    return iconObject;
+  } else {
+    return null;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Array.<number>} Flat coordinates.
+ */
+ol.format.KML.readFlatCoordinatesFromNode_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  return /** @type {Array.<number>} */ (ol.xml.pushParseAndPop(null,
+      ol.format.KML.GEOMETRY_FLAT_COORDINATES_PARSERS_, node, objectStack));
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.geom.LineString|undefined} LineString.
+ */
+ol.format.KML.readLineString_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'LineString',
+      'localName should be LineString');
+  var properties = ol.xml.pushParseAndPop(/** @type {Object<string,*>} */ ({}),
+      ol.format.KML.EXTRUDE_AND_ALTITUDE_MODE_PARSERS_, node,
+      objectStack);
+  var flatCoordinates =
+      ol.format.KML.readFlatCoordinatesFromNode_(node, objectStack);
+  if (flatCoordinates) {
+    var lineString = new ol.geom.LineString(null);
+    lineString.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates);
+    lineString.setProperties(properties);
+    return lineString;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.geom.Polygon|undefined} Polygon.
+ */
+ol.format.KML.readLinearRing_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'LinearRing',
+      'localName should be LinearRing');
+  var properties = ol.xml.pushParseAndPop(/** @type {Object<string,*>} */ ({}),
+      ol.format.KML.EXTRUDE_AND_ALTITUDE_MODE_PARSERS_, node,
+      objectStack);
+  var flatCoordinates =
+      ol.format.KML.readFlatCoordinatesFromNode_(node, objectStack);
+  if (flatCoordinates) {
+    var polygon = new ol.geom.Polygon(null);
+    polygon.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates,
+        [flatCoordinates.length]);
+    polygon.setProperties(properties);
+    return polygon;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.geom.Geometry} Geometry.
+ */
+ol.format.KML.readMultiGeometry_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'MultiGeometry',
+      'localName should be MultiGeometry');
+  var geometries = ol.xml.pushParseAndPop(
+      /** @type {Array.<ol.geom.Geometry>} */ ([]),
+      ol.format.KML.MULTI_GEOMETRY_PARSERS_, node, objectStack);
+  if (!geometries) {
+    return null;
+  }
+  if (geometries.length === 0) {
+    return new ol.geom.GeometryCollection(geometries);
+  }
+  var homogeneous = true;
+  var type = geometries[0].getType();
+  var geometry, i, ii;
+  for (i = 1, ii = geometries.length; i < ii; ++i) {
+    geometry = geometries[i];
+    if (geometry.getType() != type) {
+      homogeneous = false;
+      break;
+    }
+  }
+  if (homogeneous) {
+    /** @type {ol.geom.GeometryLayout} */
+    var layout;
+    /** @type {Array.<number>} */
+    var flatCoordinates;
+    if (type == ol.geom.GeometryType.POINT) {
+      var point = geometries[0];
+      goog.asserts.assertInstanceof(point, ol.geom.Point,
+          'point should be an ol.geom.Point');
+      layout = point.getLayout();
+      flatCoordinates = point.getFlatCoordinates();
+      for (i = 1, ii = geometries.length; i < ii; ++i) {
+        geometry = geometries[i];
+        goog.asserts.assertInstanceof(geometry, ol.geom.Point,
+            'geometry should be an ol.geom.Point');
+        goog.asserts.assert(geometry.getLayout() == layout,
+            'geometry layout should be consistent');
+        goog.array.extend(flatCoordinates, geometry.getFlatCoordinates());
+      }
+      var multiPoint = new ol.geom.MultiPoint(null);
+      multiPoint.setFlatCoordinates(layout, flatCoordinates);
+      ol.format.KML.setCommonGeometryProperties_(multiPoint, geometries);
+      return multiPoint;
+    } else if (type == ol.geom.GeometryType.LINE_STRING) {
+      var multiLineString = new ol.geom.MultiLineString(null);
+      multiLineString.setLineStrings(geometries);
+      ol.format.KML.setCommonGeometryProperties_(multiLineString, geometries);
+      return multiLineString;
+    } else if (type == ol.geom.GeometryType.POLYGON) {
+      var multiPolygon = new ol.geom.MultiPolygon(null);
+      multiPolygon.setPolygons(geometries);
+      ol.format.KML.setCommonGeometryProperties_(multiPolygon, geometries);
+      return multiPolygon;
+    } else if (type == ol.geom.GeometryType.GEOMETRY_COLLECTION) {
+      return new ol.geom.GeometryCollection(geometries);
+    } else {
+      goog.asserts.fail('Unexpected type: ' + type);
+      return null;
+    }
+  } else {
+    return new ol.geom.GeometryCollection(geometries);
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.geom.Point|undefined} Point.
+ */
+ol.format.KML.readPoint_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Point', 'localName should be Point');
+  var properties = ol.xml.pushParseAndPop(/** @type {Object<string,*>} */ ({}),
+      ol.format.KML.EXTRUDE_AND_ALTITUDE_MODE_PARSERS_, node,
+      objectStack);
+  var flatCoordinates =
+      ol.format.KML.readFlatCoordinatesFromNode_(node, objectStack);
+  if (flatCoordinates) {
+    var point = new ol.geom.Point(null);
+    goog.asserts.assert(flatCoordinates.length == 3,
+        'flatCoordinates should have a length of 3');
+    point.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates);
+    point.setProperties(properties);
+    return point;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.geom.Polygon|undefined} Polygon.
+ */
+ol.format.KML.readPolygon_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Polygon',
+      'localName should be Polygon');
+  var properties = ol.xml.pushParseAndPop(/** @type {Object<string,*>} */ ({}),
+      ol.format.KML.EXTRUDE_AND_ALTITUDE_MODE_PARSERS_, node,
+      objectStack);
+  var flatLinearRings = ol.xml.pushParseAndPop(
+      /** @type {Array.<Array.<number>>} */ ([null]),
+      ol.format.KML.FLAT_LINEAR_RINGS_PARSERS_, node, objectStack);
+  if (flatLinearRings && flatLinearRings[0]) {
+    var polygon = new ol.geom.Polygon(null);
+    var flatCoordinates = flatLinearRings[0];
+    var ends = [flatCoordinates.length];
+    var i, ii;
+    for (i = 1, ii = flatLinearRings.length; i < ii; ++i) {
+      goog.array.extend(flatCoordinates, flatLinearRings[i]);
+      ends.push(flatCoordinates.length);
+    }
+    polygon.setFlatCoordinates(
+        ol.geom.GeometryLayout.XYZ, flatCoordinates, ends);
+    polygon.setProperties(properties);
+    return polygon;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Array.<ol.style.Style>} Style.
+ */
+ol.format.KML.readStyle_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Style', 'localName should be Style');
+  var styleObject = ol.xml.pushParseAndPop(
+      {}, ol.format.KML.STYLE_PARSERS_, node, objectStack);
+  if (!styleObject) {
+    return null;
+  }
+  var fillStyle = /** @type {ol.style.Fill} */
+      ('fillStyle' in styleObject ?
+          styleObject['fillStyle'] : ol.format.KML.DEFAULT_FILL_STYLE_);
+  var fill = /** @type {boolean|undefined} */ (styleObject['fill']);
+  if (fill !== undefined && !fill) {
+    fillStyle = null;
+  }
+  var imageStyle = /** @type {ol.style.Image} */
+      ('imageStyle' in styleObject ?
+          styleObject['imageStyle'] : ol.format.KML.DEFAULT_IMAGE_STYLE_);
+  var textStyle = /** @type {ol.style.Text} */
+      ('textStyle' in styleObject ?
+          styleObject['textStyle'] : ol.format.KML.DEFAULT_TEXT_STYLE_);
+  var strokeStyle = /** @type {ol.style.Stroke} */
+      ('strokeStyle' in styleObject ?
+          styleObject['strokeStyle'] : ol.format.KML.DEFAULT_STROKE_STYLE_);
+  var outline = /** @type {boolean|undefined} */
+      (styleObject['outline']);
+  if (outline !== undefined && !outline) {
+    strokeStyle = null;
+  }
+  return [new ol.style.Style({
+    fill: fillStyle,
+    image: imageStyle,
+    stroke: strokeStyle,
+    text: textStyle,
+    zIndex: undefined // FIXME
+  })];
+};
+
+
+/**
+ * Reads an array of geometries and creates arrays for common geometry
+ * properties. Then sets them to the multi geometry.
+ * @param {ol.geom.MultiPoint|ol.geom.MultiLineString|ol.geom.MultiPolygon}
+ * multiGeometry
+ * @param {Array.<ol.geom.Geometry>} geometries
+ * @private
+ */
+ol.format.KML.setCommonGeometryProperties_ = function(multiGeometry,
+    geometries) {
+  var ii = geometries.length;
+  var extrudes = new Array(geometries.length);
+  var altitudeModes = new Array(geometries.length);
+  var geometry, i, hasExtrude, hasAltitudeMode;
+  hasExtrude = hasAltitudeMode = false;
+  for (i = 0; i < ii; ++i) {
+    geometry = geometries[i];
+    extrudes[i] = geometry.get('extrude');
+    altitudeModes[i] = geometry.get('altitudeMode');
+    hasExtrude = hasExtrude || extrudes[i] !== undefined;
+    hasAltitudeMode = hasAltitudeMode || altitudeModes[i];
+  }
+  if (hasExtrude) {
+    multiGeometry.set('extrude', extrudes);
+  }
+  if (hasAltitudeMode) {
+    multiGeometry.set('altitudeMode', altitudeModes);
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.DataParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Data', 'localName should be Data');
+  var name = node.getAttribute('name');
+  if (name !== null) {
+    var data = ol.xml.pushParseAndPop(
+        undefined, ol.format.KML.DATA_PARSERS_, node, objectStack);
+    if (data) {
+      var featureObject =
+          /** @type {Object} */ (objectStack[objectStack.length - 1]);
+      goog.asserts.assert(goog.isObject(featureObject),
+          'featureObject should be an Object');
+      featureObject[name] = data;
+    }
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.ExtendedDataParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'ExtendedData',
+      'localName should be ExtendedData');
+  ol.xml.parseNode(ol.format.KML.EXTENDED_DATA_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.PairDataParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Pair', 'localName should be Pair');
+  var pairObject = ol.xml.pushParseAndPop(
+      {}, ol.format.KML.PAIR_PARSERS_, node, objectStack);
+  if (!pairObject) {
+    return;
+  }
+  var key = /** @type {string|undefined} */
+      (pairObject['key']);
+  if (key && key == 'normal') {
+    var styleUrl = /** @type {string|undefined} */
+        (pairObject['styleUrl']);
+    if (styleUrl) {
+      objectStack[objectStack.length - 1] = styleUrl;
+    }
+    var Style = /** @type {ol.style.Style} */
+        (pairObject['Style']);
+    if (Style) {
+      objectStack[objectStack.length - 1] = Style;
+    }
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.PlacemarkStyleMapParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'StyleMap',
+      'localName should be StyleMap');
+  var styleMapValue = ol.format.KML.readStyleMapValue_(node, objectStack);
+  if (!styleMapValue) {
+    return;
+  }
+  var placemarkObject = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(placemarkObject),
+      'placemarkObject should be an Object');
+  if (goog.isArray(styleMapValue)) {
+    placemarkObject['Style'] = styleMapValue;
+  } else if (goog.isString(styleMapValue)) {
+    placemarkObject['styleUrl'] = styleMapValue;
+  } else {
+    goog.asserts.fail('styleMapValue has an unknown type');
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.SchemaDataParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'SchemaData',
+      'localName should be SchemaData');
+  ol.xml.parseNode(ol.format.KML.SCHEMA_DATA_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.SimpleDataParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'SimpleData',
+      'localName should be SimpleData');
+  var name = node.getAttribute('name');
+  if (name !== null) {
+    var data = ol.format.XSD.readString(node);
+    var featureObject =
+        /** @type {Object} */ (objectStack[objectStack.length - 1]);
+    featureObject[name] = data;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.innerBoundaryIsParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'innerBoundaryIs',
+      'localName should be innerBoundaryIs');
+  var flatLinearRing = ol.xml.pushParseAndPop(
+      /** @type {Array.<number>|undefined} */ (undefined),
+      ol.format.KML.INNER_BOUNDARY_IS_PARSERS_, node, objectStack);
+  if (flatLinearRing) {
+    var flatLinearRings = /** @type {Array.<Array.<number>>} */
+        (objectStack[objectStack.length - 1]);
+    goog.asserts.assert(goog.isArray(flatLinearRings),
+        'flatLinearRings should be an array');
+    goog.asserts.assert(flatLinearRings.length > 0,
+        'flatLinearRings array should not be empty');
+    flatLinearRings.push(flatLinearRing);
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.outerBoundaryIsParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'outerBoundaryIs',
+      'localName should be outerBoundaryIs');
+  var flatLinearRing = ol.xml.pushParseAndPop(
+      /** @type {Array.<number>|undefined} */ (undefined),
+      ol.format.KML.OUTER_BOUNDARY_IS_PARSERS_, node, objectStack);
+  if (flatLinearRing) {
+    var flatLinearRings = /** @type {Array.<Array.<number>>} */
+        (objectStack[objectStack.length - 1]);
+    goog.asserts.assert(goog.isArray(flatLinearRings),
+        'flatLinearRings should be an array');
+    goog.asserts.assert(flatLinearRings.length > 0,
+        'flatLinearRings array should not be empty');
+    flatLinearRings[0] = flatLinearRing;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.LinkParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Link', 'localName should be Link');
+  ol.xml.parseNode(ol.format.KML.LINK_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.whenParser_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'when', 'localName should be when');
+  var gxTrackObject = /** @type {ol.format.KMLGxTrackObject_} */
+      (objectStack[objectStack.length - 1]);
+  goog.asserts.assert(goog.isObject(gxTrackObject),
+      'gxTrackObject should be an Object');
+  var whens = gxTrackObject.whens;
+  var s = ol.xml.getAllTextContent(node, false);
+  var re =
+      /^\s*(\d{4})($|-(\d{2})($|-(\d{2})($|T(\d{2}):(\d{2}):(\d{2})(Z|(?:([+\-])(\d{2})(?::(\d{2}))?)))))\s*$/;
+  var m = re.exec(s);
+  if (m) {
+    var year = parseInt(m[1], 10);
+    var month = m[3] ? parseInt(m[3], 10) - 1 : 0;
+    var day = m[5] ? parseInt(m[5], 10) : 1;
+    var hour = m[7] ? parseInt(m[7], 10) : 0;
+    var minute = m[8] ? parseInt(m[8], 10) : 0;
+    var second = m[9] ? parseInt(m[9], 10) : 0;
+    var when = Date.UTC(year, month, day, hour, minute, second);
+    if (m[10] && m[10] != 'Z') {
+      var sign = m[11] == '-' ? -1 : 1;
+      when += sign * 60 * parseInt(m[12], 10);
+      if (m[13]) {
+        when += sign * 60 * 60 * parseInt(m[13], 10);
+      }
+    }
+    whens.push(when);
+  } else {
+    whens.push(0);
+  }
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.DATA_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'value': ol.xml.makeReplacer(ol.format.XSD.readString)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.EXTENDED_DATA_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'Data': ol.format.KML.DataParser_,
+      'SchemaData': ol.format.KML.SchemaDataParser_
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.EXTRUDE_AND_ALTITUDE_MODE_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'extrude': ol.xml.makeObjectPropertySetter(ol.format.XSD.readBoolean),
+      'altitudeMode': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.FLAT_LINEAR_RING_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'coordinates': ol.xml.makeReplacer(ol.format.KML.readFlatCoordinates_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.FLAT_LINEAR_RINGS_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'innerBoundaryIs': ol.format.KML.innerBoundaryIsParser_,
+      'outerBoundaryIs': ol.format.KML.outerBoundaryIsParser_
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.GX_TRACK_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'when': ol.format.KML.whenParser_
+    }, ol.xml.makeStructureNS(
+        ol.format.KML.GX_NAMESPACE_URIS_, {
+          'coord': ol.format.KML.gxCoordParser_
+        }));
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.GEOMETRY_FLAT_COORDINATES_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'coordinates': ol.xml.makeReplacer(ol.format.KML.readFlatCoordinates_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.ICON_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'href': ol.xml.makeObjectPropertySetter(ol.format.KML.readURI_)
+    }, ol.xml.makeStructureNS(
+        ol.format.KML.GX_NAMESPACE_URIS_, {
+          'x': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
+          'y': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
+          'w': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
+          'h': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal)
+        }));
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.ICON_STYLE_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'Icon': ol.xml.makeObjectPropertySetter(ol.format.KML.readIcon_),
+      'heading': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
+      'hotSpot': ol.xml.makeObjectPropertySetter(ol.format.KML.readVec2_),
+      'scale': ol.xml.makeObjectPropertySetter(ol.format.KML.readScale_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.INNER_BOUNDARY_IS_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'LinearRing': ol.xml.makeReplacer(ol.format.KML.readFlatLinearRing_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.LABEL_STYLE_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'color': ol.xml.makeObjectPropertySetter(ol.format.KML.readColor_),
+      'scale': ol.xml.makeObjectPropertySetter(ol.format.KML.readScale_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.LINE_STYLE_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'color': ol.xml.makeObjectPropertySetter(ol.format.KML.readColor_),
+      'width': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.MULTI_GEOMETRY_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'LineString': ol.xml.makeArrayPusher(ol.format.KML.readLineString_),
+      'LinearRing': ol.xml.makeArrayPusher(ol.format.KML.readLinearRing_),
+      'MultiGeometry': ol.xml.makeArrayPusher(ol.format.KML.readMultiGeometry_),
+      'Point': ol.xml.makeArrayPusher(ol.format.KML.readPoint_),
+      'Polygon': ol.xml.makeArrayPusher(ol.format.KML.readPolygon_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.GX_MULTITRACK_GEOMETRY_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.GX_NAMESPACE_URIS_, {
+      'Track': ol.xml.makeArrayPusher(ol.format.KML.readGxTrack_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.NETWORK_LINK_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'ExtendedData': ol.format.KML.ExtendedDataParser_,
+      'Link': ol.format.KML.LinkParser_,
+      'address': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'description': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'name': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'open': ol.xml.makeObjectPropertySetter(ol.format.XSD.readBoolean),
+      'phoneNumber': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'visibility': ol.xml.makeObjectPropertySetter(ol.format.XSD.readBoolean)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.LINK_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'href': ol.xml.makeObjectPropertySetter(ol.format.KML.readURI_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.OUTER_BOUNDARY_IS_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'LinearRing': ol.xml.makeReplacer(ol.format.KML.readFlatLinearRing_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.PAIR_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'Style': ol.xml.makeObjectPropertySetter(ol.format.KML.readStyle_),
+      'key': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'styleUrl': ol.xml.makeObjectPropertySetter(ol.format.KML.readStyleUrl_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.PLACEMARK_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'ExtendedData': ol.format.KML.ExtendedDataParser_,
+      'MultiGeometry': ol.xml.makeObjectPropertySetter(
+          ol.format.KML.readMultiGeometry_, 'geometry'),
+      'LineString': ol.xml.makeObjectPropertySetter(
+          ol.format.KML.readLineString_, 'geometry'),
+      'LinearRing': ol.xml.makeObjectPropertySetter(
+          ol.format.KML.readLinearRing_, 'geometry'),
+      'Point': ol.xml.makeObjectPropertySetter(
+          ol.format.KML.readPoint_, 'geometry'),
+      'Polygon': ol.xml.makeObjectPropertySetter(
+          ol.format.KML.readPolygon_, 'geometry'),
+      'Style': ol.xml.makeObjectPropertySetter(ol.format.KML.readStyle_),
+      'StyleMap': ol.format.KML.PlacemarkStyleMapParser_,
+      'address': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'description': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'name': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'open': ol.xml.makeObjectPropertySetter(ol.format.XSD.readBoolean),
+      'phoneNumber': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'styleUrl': ol.xml.makeObjectPropertySetter(ol.format.KML.readURI_),
+      'visibility': ol.xml.makeObjectPropertySetter(ol.format.XSD.readBoolean)
+    }, ol.xml.makeStructureNS(
+        ol.format.KML.GX_NAMESPACE_URIS_, {
+          'MultiTrack': ol.xml.makeObjectPropertySetter(
+              ol.format.KML.readGxMultiTrack_, 'geometry'),
+          'Track': ol.xml.makeObjectPropertySetter(
+              ol.format.KML.readGxTrack_, 'geometry')
+        }
+    ));
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.POLY_STYLE_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'color': ol.xml.makeObjectPropertySetter(ol.format.KML.readColor_),
+      'fill': ol.xml.makeObjectPropertySetter(ol.format.XSD.readBoolean),
+      'outline': ol.xml.makeObjectPropertySetter(ol.format.XSD.readBoolean)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.SCHEMA_DATA_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'SimpleData': ol.format.KML.SimpleDataParser_
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.STYLE_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'IconStyle': ol.format.KML.IconStyleParser_,
+      'LabelStyle': ol.format.KML.LabelStyleParser_,
+      'LineStyle': ol.format.KML.LineStyleParser_,
+      'PolyStyle': ol.format.KML.PolyStyleParser_
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.KML.STYLE_MAP_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'Pair': ol.format.KML.PairDataParser_
+    });
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.KML.prototype.getExtensions = function() {
+  return ol.format.KML.EXTENSIONS_;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Array.<ol.Feature>|undefined} Features.
+ */
+ol.format.KML.prototype.readDocumentOrFolder_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  var localName = ol.xml.getLocalName(node);
+  goog.asserts.assert(localName == 'Document' || localName == 'Folder',
+      'localName should be Document or Folder');
+  // FIXME use scope somehow
+  var parsersNS = ol.xml.makeStructureNS(
+      ol.format.KML.NAMESPACE_URIS_, {
+        'Document': ol.xml.makeArrayExtender(this.readDocumentOrFolder_, this),
+        'Folder': ol.xml.makeArrayExtender(this.readDocumentOrFolder_, this),
+        'Placemark': ol.xml.makeArrayPusher(this.readPlacemark_, this),
+        'Style': goog.bind(this.readSharedStyle_, this),
+        'StyleMap': goog.bind(this.readSharedStyleMap_, this)
+      });
+  var features = ol.xml.pushParseAndPop(/** @type {Array.<ol.Feature>} */ ([]),
+      parsersNS, node, objectStack, this);
+  if (features) {
+    return features;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.Feature|undefined} Feature.
+ */
+ol.format.KML.prototype.readPlacemark_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Placemark',
+      'localName should be Placemark');
+  var object = ol.xml.pushParseAndPop({'geometry': null},
+      ol.format.KML.PLACEMARK_PARSERS_, node, objectStack);
+  if (!object) {
+    return undefined;
+  }
+  var feature = new ol.Feature();
+  var id = node.getAttribute('id');
+  if (id !== null) {
+    feature.setId(id);
+  }
+  var options = /** @type {olx.format.ReadOptions} */ (objectStack[0]);
+
+  var geometry = object['geometry'];
+  if (geometry) {
+    ol.format.Feature.transformWithOptions(geometry, false, options);
+  }
+  feature.setGeometry(geometry);
+  delete object['geometry'];
+
+  if (this.extractStyles_) {
+    var style = object['Style'];
+    var styleUrl = object['styleUrl'];
+    var styleFunction = ol.format.KML.createFeatureStyleFunction_(
+        style, styleUrl, this.defaultStyle_, this.sharedStyles_,
+        this.showPointNames_);
+    feature.setStyle(styleFunction);
+  }
+  delete object['Style'];
+  // we do not remove the styleUrl property from the object, so it
+  // gets stored on feature when setProperties is called
+
+  feature.setProperties(object);
+
+  return feature;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.prototype.readSharedStyle_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Style', 'localName should be Style');
+  var id = node.getAttribute('id');
+  if (id !== null) {
+    var style = ol.format.KML.readStyle_(node, objectStack);
+    if (style) {
+      var styleUri;
+      if (node.baseURI) {
+        styleUri = goog.Uri.resolve(node.baseURI, '#' + id).toString();
+      } else {
+        styleUri = '#' + id;
+      }
+      this.sharedStyles_[styleUri] = style;
+    }
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.prototype.readSharedStyleMap_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'StyleMap',
+      'localName should be StyleMap');
+  var id = node.getAttribute('id');
+  if (id === null) {
+    return;
+  }
+  var styleMapValue = ol.format.KML.readStyleMapValue_(node, objectStack);
+  if (!styleMapValue) {
+    return;
+  }
+  var styleUri;
+  if (node.baseURI) {
+    styleUri = goog.Uri.resolve(node.baseURI, '#' + id).toString();
+  } else {
+    styleUri = '#' + id;
+  }
+  this.sharedStyles_[styleUri] = styleMapValue;
+};
+
+
+/**
+ * Read the first feature from a KML source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {ol.Feature} Feature.
+ * @api stable
+ */
+ol.format.KML.prototype.readFeature;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.KML.prototype.readFeatureFromNode = function(node, opt_options) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  if (!ol.array.includes(ol.format.KML.NAMESPACE_URIS_, node.namespaceURI)) {
+    return null;
+  }
+  goog.asserts.assert(node.localName == 'Placemark',
+      'localName should be Placemark');
+  var feature = this.readPlacemark_(
+      node, [this.getReadOptions(node, opt_options)]);
+  if (feature) {
+    return feature;
+  } else {
+    return null;
+  }
+};
+
+
+/**
+ * Read all features from a KML source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {Array.<ol.Feature>} Features.
+ * @api stable
+ */
+ol.format.KML.prototype.readFeatures;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.KML.prototype.readFeaturesFromNode = function(node, opt_options) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  if (!ol.array.includes(ol.format.KML.NAMESPACE_URIS_, node.namespaceURI)) {
+    return [];
+  }
+  var features;
+  var localName = ol.xml.getLocalName(node);
+  if (localName == 'Document' || localName == 'Folder') {
+    features = this.readDocumentOrFolder_(
+        node, [this.getReadOptions(node, opt_options)]);
+    if (features) {
+      return features;
+    } else {
+      return [];
+    }
+  } else if (localName == 'Placemark') {
+    var feature = this.readPlacemark_(
+        node, [this.getReadOptions(node, opt_options)]);
+    if (feature) {
+      return [feature];
+    } else {
+      return [];
+    }
+  } else if (localName == 'kml') {
+    features = [];
+    var n;
+    for (n = node.firstElementChild; n; n = n.nextElementSibling) {
+      var fs = this.readFeaturesFromNode(n, opt_options);
+      if (fs) {
+        goog.array.extend(features, fs);
+      }
+    }
+    return features;
+  } else {
+    return [];
+  }
+};
+
+
+/**
+ * Read the name of the KML.
+ *
+ * @param {Document|Node|string} source Souce.
+ * @return {string|undefined} Name.
+ * @api stable
+ */
+ol.format.KML.prototype.readName = function(source) {
+  if (ol.xml.isDocument(source)) {
+    return this.readNameFromDocument(/** @type {Document} */ (source));
+  } else if (ol.xml.isNode(source)) {
+    return this.readNameFromNode(/** @type {Node} */ (source));
+  } else if (goog.isString(source)) {
+    var doc = ol.xml.parse(source);
+    return this.readNameFromDocument(doc);
+  } else {
+    goog.asserts.fail('Unknown type for source');
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Document} doc Document.
+ * @return {string|undefined} Name.
+ */
+ol.format.KML.prototype.readNameFromDocument = function(doc) {
+  var n;
+  for (n = doc.firstChild; n; n = n.nextSibling) {
+    if (n.nodeType == goog.dom.NodeType.ELEMENT) {
+      var name = this.readNameFromNode(n);
+      if (name) {
+        return name;
+      }
+    }
+  }
+  return undefined;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @return {string|undefined} Name.
+ */
+ol.format.KML.prototype.readNameFromNode = function(node) {
+  var n;
+  for (n = node.firstElementChild; n; n = n.nextElementSibling) {
+    if (ol.array.includes(ol.format.KML.NAMESPACE_URIS_, n.namespaceURI) &&
+        n.localName == 'name') {
+      return ol.format.XSD.readString(n);
+    }
+  }
+  for (n = node.firstElementChild; n; n = n.nextElementSibling) {
+    var localName = ol.xml.getLocalName(n);
+    if (ol.array.includes(ol.format.KML.NAMESPACE_URIS_, n.namespaceURI) &&
+        (localName == 'Document' ||
+         localName == 'Folder' ||
+         localName == 'Placemark' ||
+         localName == 'kml')) {
+      var name = this.readNameFromNode(n);
+      if (name) {
+        return name;
+      }
+    }
+  }
+  return undefined;
+};
+
+
+/**
+ * Read the network links of the KML.
+ *
+ * @param {Document|Node|string} source Source.
+ * @return {Array.<Object>} Network links.
+ * @api
+ */
+ol.format.KML.prototype.readNetworkLinks = function(source) {
+  var networkLinks = [];
+  if (ol.xml.isDocument(source)) {
+    goog.array.extend(networkLinks, this.readNetworkLinksFromDocument(
+        /** @type {Document} */ (source)));
+  } else if (ol.xml.isNode(source)) {
+    goog.array.extend(networkLinks, this.readNetworkLinksFromNode(
+        /** @type {Node} */ (source)));
+  } else if (goog.isString(source)) {
+    var doc = ol.xml.parse(source);
+    goog.array.extend(networkLinks, this.readNetworkLinksFromDocument(doc));
+  } else {
+    goog.asserts.fail('unknown type for source');
+  }
+  return networkLinks;
+};
+
+
+/**
+ * @param {Document} doc Document.
+ * @return {Array.<Object>} Network links.
+ */
+ol.format.KML.prototype.readNetworkLinksFromDocument = function(doc) {
+  var n, networkLinks = [];
+  for (n = doc.firstChild; n; n = n.nextSibling) {
+    if (n.nodeType == goog.dom.NodeType.ELEMENT) {
+      goog.array.extend(networkLinks, this.readNetworkLinksFromNode(n));
+    }
+  }
+  return networkLinks;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @return {Array.<Object>} Network links.
+ */
+ol.format.KML.prototype.readNetworkLinksFromNode = function(node) {
+  var n, networkLinks = [];
+  for (n = node.firstElementChild; n; n = n.nextElementSibling) {
+    if (ol.array.includes(ol.format.KML.NAMESPACE_URIS_, n.namespaceURI) &&
+        n.localName == 'NetworkLink') {
+      var obj = ol.xml.pushParseAndPop({}, ol.format.KML.NETWORK_LINK_PARSERS_,
+          n, []);
+      networkLinks.push(obj);
+    }
+  }
+  for (n = node.firstElementChild; n; n = n.nextElementSibling) {
+    var localName = ol.xml.getLocalName(n);
+    if (ol.array.includes(ol.format.KML.NAMESPACE_URIS_, n.namespaceURI) &&
+        (localName == 'Document' ||
+         localName == 'Folder' ||
+         localName == 'kml')) {
+      goog.array.extend(networkLinks, this.readNetworkLinksFromNode(n));
+    }
+  }
+  return networkLinks;
+};
+
+
+/**
+ * Read the projection from a KML source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @return {ol.proj.Projection} Projection.
+ * @api stable
+ */
+ol.format.KML.prototype.readProjection;
+
+
+/**
+ * @param {Node} node Node to append a TextNode with the color to.
+ * @param {ol.Color|string} color Color.
+ * @private
+ */
+ol.format.KML.writeColorTextNode_ = function(node, color) {
+  var rgba = ol.color.asArray(color);
+  var opacity = (rgba.length == 4) ? rgba[3] : 1;
+  var abgr = [opacity * 255, rgba[2], rgba[1], rgba[0]];
+  var i;
+  for (i = 0; i < 4; ++i) {
+    var hex = parseInt(abgr[i], 10).toString(16);
+    abgr[i] = (hex.length == 1) ? '0' + hex : hex;
+  }
+  ol.format.XSD.writeStringTextNode(node, abgr.join(''));
+};
+
+
+/**
+ * @param {Node} node Node to append a TextNode with the coordinates to.
+ * @param {Array.<number>} coordinates Coordinates.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.writeCoordinatesTextNode_ =
+    function(node, coordinates, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+
+  var layout = context['layout'];
+  var stride = context['stride'];
+
+  var dimension;
+  if (layout == ol.geom.GeometryLayout.XY ||
+      layout == ol.geom.GeometryLayout.XYM) {
+    dimension = 2;
+  } else if (layout == ol.geom.GeometryLayout.XYZ ||
+      layout == ol.geom.GeometryLayout.XYZM) {
+    dimension = 3;
+  } else {
+    goog.asserts.fail('Unknown geometry layout');
+  }
+
+  var d, i;
+  var ii = coordinates.length;
+  var text = '';
+  if (ii > 0) {
+    text += coordinates[0];
+    for (d = 1; d < dimension; ++d) {
+      text += ',' + coordinates[d];
+    }
+    for (i = stride; i < ii; i += stride) {
+      text += ' ' + coordinates[i];
+      for (d = 1; d < dimension; ++d) {
+        text += ',' + coordinates[i + d];
+      }
+    }
+  }
+  ol.format.XSD.writeStringTextNode(node, text);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {Array.<*>} objectStack Object stack.
+ * @this {ol.format.KML}
+ * @private
+ */
+ol.format.KML.writeDocument_ = function(node, features, objectStack) {
+  var /** @type {ol.xml.NodeStackItem} */ context = {node: node};
+  ol.xml.pushSerializeAndPop(context, ol.format.KML.DOCUMENT_SERIALIZERS_,
+      ol.format.KML.DOCUMENT_NODE_FACTORY_, features, objectStack, undefined,
+      this);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Object} icon Icon object.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.writeIcon_ = function(node, icon, objectStack) {
+  var /** @type {ol.xml.NodeStackItem} */ context = {node: node};
+  var parentNode = objectStack[objectStack.length - 1].node;
+  var orderedKeys = ol.format.KML.ICON_SEQUENCE_[parentNode.namespaceURI];
+  var values = ol.xml.makeSequence(icon, orderedKeys);
+  ol.xml.pushSerializeAndPop(context,
+      ol.format.KML.ICON_SERIALIZERS_, ol.xml.OBJECT_PROPERTY_NODE_FACTORY,
+      values, objectStack, orderedKeys);
+  orderedKeys =
+      ol.format.KML.ICON_SEQUENCE_[ol.format.KML.GX_NAMESPACE_URIS_[0]];
+  values = ol.xml.makeSequence(icon, orderedKeys);
+  ol.xml.pushSerializeAndPop(context, ol.format.KML.ICON_SERIALIZERS_,
+      ol.format.KML.GX_NODE_FACTORY_, values, objectStack, orderedKeys);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.style.Icon} style Icon style.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.writeIconStyle_ = function(node, style, objectStack) {
+  var /** @type {ol.xml.NodeStackItem} */ context = {node: node};
+  var properties = {};
+  var src = style.getSrc();
+  var size = style.getSize();
+  var iconImageSize = style.getImageSize();
+  var iconProperties = {
+    'href': src
+  };
+
+  if (size) {
+    iconProperties['w'] = size[0];
+    iconProperties['h'] = size[1];
+    var anchor = style.getAnchor(); // top-left
+    var origin = style.getOrigin(); // top-left
+
+    if (origin && iconImageSize && origin[0] !== 0 && origin[1] !== size[1]) {
+      iconProperties['x'] = origin[0];
+      iconProperties['y'] = iconImageSize[1] - (origin[1] + size[1]);
+    }
+
+    if (anchor && anchor[0] !== 0 && anchor[1] !== size[1]) {
+      var /** @type {ol.format.KMLVec2_} */ hotSpot = {
+        x: anchor[0],
+        xunits: ol.style.IconAnchorUnits.PIXELS,
+        y: size[1] - anchor[1],
+        yunits: ol.style.IconAnchorUnits.PIXELS
+      };
+      properties['hotSpot'] = hotSpot;
+    }
+  }
+
+  properties['Icon'] = iconProperties;
+
+  var scale = style.getScale();
+  if (scale !== 1) {
+    properties['scale'] = scale;
+  }
+
+  var rotation = style.getRotation();
+  if (rotation !== 0) {
+    properties['heading'] = rotation; // 0-360
+  }
+
+  var parentNode = objectStack[objectStack.length - 1].node;
+  var orderedKeys = ol.format.KML.ICON_STYLE_SEQUENCE_[parentNode.namespaceURI];
+  var values = ol.xml.makeSequence(properties, orderedKeys);
+  ol.xml.pushSerializeAndPop(context, ol.format.KML.ICON_STYLE_SERIALIZERS_,
+      ol.xml.OBJECT_PROPERTY_NODE_FACTORY, values, objectStack, orderedKeys);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.style.Text} style style.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.writeLabelStyle_ = function(node, style, objectStack) {
+  var /** @type {ol.xml.NodeStackItem} */ context = {node: node};
+  var properties = {};
+  var fill = style.getFill();
+  if (fill) {
+    properties['color'] = fill.getColor();
+  }
+  var scale = style.getScale();
+  if (scale && scale !== 1) {
+    properties['scale'] = scale;
+  }
+  var parentNode = objectStack[objectStack.length - 1].node;
+  var orderedKeys =
+      ol.format.KML.LABEL_STYLE_SEQUENCE_[parentNode.namespaceURI];
+  var values = ol.xml.makeSequence(properties, orderedKeys);
+  ol.xml.pushSerializeAndPop(context, ol.format.KML.LABEL_STYLE_SERIALIZERS_,
+      ol.xml.OBJECT_PROPERTY_NODE_FACTORY, values, objectStack, orderedKeys);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.style.Stroke} style style.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.writeLineStyle_ = function(node, style, objectStack) {
+  var /** @type {ol.xml.NodeStackItem} */ context = {node: node};
+  var properties = {
+    'color': style.getColor(),
+    'width': style.getWidth()
+  };
+  var parentNode = objectStack[objectStack.length - 1].node;
+  var orderedKeys = ol.format.KML.LINE_STYLE_SEQUENCE_[parentNode.namespaceURI];
+  var values = ol.xml.makeSequence(properties, orderedKeys);
+  ol.xml.pushSerializeAndPop(context, ol.format.KML.LINE_STYLE_SERIALIZERS_,
+      ol.xml.OBJECT_PROPERTY_NODE_FACTORY, values, objectStack, orderedKeys);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.writeMultiGeometry_ =
+    function(node, geometry, objectStack) {
+  goog.asserts.assert(
+      (geometry instanceof ol.geom.MultiPoint) ||
+      (geometry instanceof ol.geom.MultiLineString) ||
+      (geometry instanceof ol.geom.MultiPolygon),
+      'geometry should be one of: ol.geom.MultiPoint, ' +
+      'ol.geom.MultiLineString or ol.geom.MultiPolygon');
+  /** @type {ol.xml.NodeStackItem} */
+  var context = {node: node};
+  var type = geometry.getType();
+  /** @type {Array.<ol.geom.Geometry>} */
+  var geometries;
+  /** @type {function(*, Array.<*>, string=): (Node|undefined)} */
+  var factory;
+  if (type == ol.geom.GeometryType.MULTI_POINT) {
+    geometries =
+        (/** @type {ol.geom.MultiPoint} */ (geometry)).getPoints();
+    factory = ol.format.KML.POINT_NODE_FACTORY_;
+  } else if (type == ol.geom.GeometryType.MULTI_LINE_STRING) {
+    geometries =
+        (/** @type {ol.geom.MultiLineString} */ (geometry)).getLineStrings();
+    factory = ol.format.KML.LINE_STRING_NODE_FACTORY_;
+  } else if (type == ol.geom.GeometryType.MULTI_POLYGON) {
+    geometries =
+        (/** @type {ol.geom.MultiPolygon} */ (geometry)).getPolygons();
+    factory = ol.format.KML.POLYGON_NODE_FACTORY_;
+  } else {
+    goog.asserts.fail('Unknown geometry type: ' + type);
+  }
+  ol.xml.pushSerializeAndPop(context,
+      ol.format.KML.MULTI_GEOMETRY_SERIALIZERS_, factory,
+      geometries, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.LinearRing} linearRing Linear ring.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.writeBoundaryIs_ = function(node, linearRing, objectStack) {
+  var /** @type {ol.xml.NodeStackItem} */ context = {node: node};
+  ol.xml.pushSerializeAndPop(context,
+      ol.format.KML.BOUNDARY_IS_SERIALIZERS_,
+      ol.format.KML.LINEAR_RING_NODE_FACTORY_, [linearRing], objectStack);
+};
+
+
+/**
+ * FIXME currently we do serialize arbitrary/custom feature properties
+ * (ExtendedData).
+ * @param {Node} node Node.
+ * @param {ol.Feature} feature Feature.
+ * @param {Array.<*>} objectStack Object stack.
+ * @this {ol.format.KML}
+ * @private
+ */
+ol.format.KML.writePlacemark_ = function(node, feature, objectStack) {
+  var /** @type {ol.xml.NodeStackItem} */ context = {node: node};
+
+  // set id
+  if (feature.getId()) {
+    node.setAttribute('id', feature.getId());
+  }
+
+  // serialize properties (properties unknown to KML are not serialized)
+  var properties = feature.getProperties();
+
+  var styleFunction = feature.getStyleFunction();
+  if (styleFunction) {
+    // FIXME the styles returned by the style function are supposed to be
+    // resolution-independent here
+    var styles = styleFunction.call(feature, 0);
+    if (styles && styles.length > 0) {
+      var style = styles[0];
+      if (this.writeStyles_) {
+        properties['Style'] = styles[0];
+      }
+      var textStyle = style.getText();
+      if (textStyle) {
+        properties['name'] = textStyle.getText();
+      }
+    }
+  }
+  var parentNode = objectStack[objectStack.length - 1].node;
+  var orderedKeys = ol.format.KML.PLACEMARK_SEQUENCE_[parentNode.namespaceURI];
+  var values = ol.xml.makeSequence(properties, orderedKeys);
+  ol.xml.pushSerializeAndPop(context, ol.format.KML.PLACEMARK_SERIALIZERS_,
+      ol.xml.OBJECT_PROPERTY_NODE_FACTORY, values, objectStack, orderedKeys);
+
+  // serialize geometry
+  var options = /** @type {olx.format.WriteOptions} */ (objectStack[0]);
+  var geometry = feature.getGeometry();
+  if (geometry) {
+    geometry =
+        ol.format.Feature.transformWithOptions(geometry, true, options);
+  }
+  ol.xml.pushSerializeAndPop(context, ol.format.KML.PLACEMARK_SERIALIZERS_,
+      ol.format.KML.GEOMETRY_NODE_FACTORY_, [geometry], objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.SimpleGeometry} geometry Geometry.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.writePrimitiveGeometry_ = function(node, geometry, objectStack) {
+  goog.asserts.assert(
+      (geometry instanceof ol.geom.Point) ||
+      (geometry instanceof ol.geom.LineString) ||
+      (geometry instanceof ol.geom.LinearRing),
+      'geometry should be one of ol.geom.Point, ol.geom.LineString ' +
+      'or ol.geom.LinearRing');
+  var flatCoordinates = geometry.getFlatCoordinates();
+  var /** @type {ol.xml.NodeStackItem} */ context = {node: node};
+  context['layout'] = geometry.getLayout();
+  context['stride'] = geometry.getStride();
+  ol.xml.pushSerializeAndPop(context,
+      ol.format.KML.PRIMITIVE_GEOMETRY_SERIALIZERS_,
+      ol.format.KML.COORDINATES_NODE_FACTORY_,
+      [flatCoordinates], objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.geom.Polygon} polygon Polygon.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.writePolygon_ = function(node, polygon, objectStack) {
+  goog.asserts.assertInstanceof(polygon, ol.geom.Polygon,
+      'polygon should be an ol.geom.Polygon');
+  var linearRings = polygon.getLinearRings();
+  goog.asserts.assert(linearRings.length > 0,
+      'linearRings should not be empty');
+  var outerRing = linearRings.shift();
+  var /** @type {ol.xml.NodeStackItem} */ context = {node: node};
+  // inner rings
+  ol.xml.pushSerializeAndPop(context,
+      ol.format.KML.POLYGON_SERIALIZERS_,
+      ol.format.KML.INNER_BOUNDARY_NODE_FACTORY_,
+      linearRings, objectStack);
+  // outer ring
+  ol.xml.pushSerializeAndPop(context,
+      ol.format.KML.POLYGON_SERIALIZERS_,
+      ol.format.KML.OUTER_BOUNDARY_NODE_FACTORY_,
+      [outerRing], objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.style.Fill} style Style.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.writePolyStyle_ = function(node, style, objectStack) {
+  var /** @type {ol.xml.NodeStackItem} */ context = {node: node};
+  ol.xml.pushSerializeAndPop(context, ol.format.KML.POLY_STYLE_SERIALIZERS_,
+      ol.format.KML.COLOR_NODE_FACTORY_, [style.getColor()], objectStack);
+};
+
+
+/**
+ * @param {Node} node Node to append a TextNode with the scale to.
+ * @param {number|undefined} scale Scale.
+ * @private
+ */
+ol.format.KML.writeScaleTextNode_ = function(node, scale) {
+  ol.format.XSD.writeDecimalTextNode(node, scale * scale);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.style.Style} style Style.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.KML.writeStyle_ = function(node, style, objectStack) {
+  var /** @type {ol.xml.NodeStackItem} */ context = {node: node};
+  var properties = {};
+  var fillStyle = style.getFill();
+  var strokeStyle = style.getStroke();
+  var imageStyle = style.getImage();
+  var textStyle = style.getText();
+  if (imageStyle instanceof ol.style.Icon) {
+    properties['IconStyle'] = imageStyle;
+  }
+  if (textStyle) {
+    properties['LabelStyle'] = textStyle;
+  }
+  if (strokeStyle) {
+    properties['LineStyle'] = strokeStyle;
+  }
+  if (fillStyle) {
+    properties['PolyStyle'] = fillStyle;
+  }
+  var parentNode = objectStack[objectStack.length - 1].node;
+  var orderedKeys = ol.format.KML.STYLE_SEQUENCE_[parentNode.namespaceURI];
+  var values = ol.xml.makeSequence(properties, orderedKeys);
+  ol.xml.pushSerializeAndPop(context, ol.format.KML.STYLE_SERIALIZERS_,
+      ol.xml.OBJECT_PROPERTY_NODE_FACTORY, values, objectStack, orderedKeys);
+};
+
+
+/**
+ * @param {Node} node Node to append a TextNode with the Vec2 to.
+ * @param {ol.format.KMLVec2_} vec2 Vec2.
+ * @private
+ */
+ol.format.KML.writeVec2_ = function(node, vec2) {
+  node.setAttribute('x', vec2.x);
+  node.setAttribute('y', vec2.y);
+  node.setAttribute('xunits', vec2.xunits);
+  node.setAttribute('yunits', vec2.yunits);
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, Array.<string>>}
+ * @private
+ */
+ol.format.KML.KML_SEQUENCE_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, [
+      'Document', 'Placemark'
+    ]);
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.KML.KML_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'Document': ol.xml.makeChildAppender(ol.format.KML.writeDocument_),
+      'Placemark': ol.xml.makeChildAppender(ol.format.KML.writePlacemark_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.KML.DOCUMENT_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'Placemark': ol.xml.makeChildAppender(ol.format.KML.writePlacemark_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, string>}
+ * @private
+ */
+ol.format.KML.GEOMETRY_TYPE_TO_NODENAME_ = {
+  'Point': 'Point',
+  'LineString': 'LineString',
+  'LinearRing': 'LinearRing',
+  'Polygon': 'Polygon',
+  'MultiPoint': 'MultiGeometry',
+  'MultiLineString': 'MultiGeometry',
+  'MultiPolygon': 'MultiGeometry'
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, Array.<string>>}
+ * @private
+ */
+ol.format.KML.ICON_SEQUENCE_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, [
+      'href'
+    ],
+    ol.xml.makeStructureNS(
+        ol.format.KML.GX_NAMESPACE_URIS_, [
+          'x', 'y', 'w', 'h'
+    ]));
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.KML.ICON_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'href': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode)
+    }, ol.xml.makeStructureNS(
+        ol.format.KML.GX_NAMESPACE_URIS_, {
+          'x': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
+          'y': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
+          'w': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
+          'h': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode)
+        }));
+
+
+/**
+ * @const
+ * @type {Object.<string, Array.<string>>}
+ * @private
+ */
+ol.format.KML.ICON_STYLE_SEQUENCE_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, [
+      'scale', 'heading', 'Icon', 'hotSpot'
+    ]);
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.KML.ICON_STYLE_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'Icon': ol.xml.makeChildAppender(ol.format.KML.writeIcon_),
+      'heading': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
+      'hotSpot': ol.xml.makeChildAppender(ol.format.KML.writeVec2_),
+      'scale': ol.xml.makeChildAppender(ol.format.KML.writeScaleTextNode_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Array.<string>>}
+ * @private
+ */
+ol.format.KML.LABEL_STYLE_SEQUENCE_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, [
+      'color', 'scale'
+    ]);
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.KML.LABEL_STYLE_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'color': ol.xml.makeChildAppender(ol.format.KML.writeColorTextNode_),
+      'scale': ol.xml.makeChildAppender(ol.format.KML.writeScaleTextNode_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Array.<string>>}
+ * @private
+ */
+ol.format.KML.LINE_STYLE_SEQUENCE_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, [
+      'color', 'width'
+    ]);
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.KML.LINE_STYLE_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'color': ol.xml.makeChildAppender(ol.format.KML.writeColorTextNode_),
+      'width': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.KML.BOUNDARY_IS_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'LinearRing': ol.xml.makeChildAppender(
+          ol.format.KML.writePrimitiveGeometry_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.KML.MULTI_GEOMETRY_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'LineString': ol.xml.makeChildAppender(
+          ol.format.KML.writePrimitiveGeometry_),
+      'Point': ol.xml.makeChildAppender(
+          ol.format.KML.writePrimitiveGeometry_),
+      'Polygon': ol.xml.makeChildAppender(ol.format.KML.writePolygon_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Array.<string>>}
+ * @private
+ */
+ol.format.KML.PLACEMARK_SEQUENCE_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, [
+      'name', 'open', 'visibility', 'address', 'phoneNumber', 'description',
+      'styleUrl', 'Style'
+    ]);
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.KML.PLACEMARK_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'MultiGeometry': ol.xml.makeChildAppender(
+          ol.format.KML.writeMultiGeometry_),
+      'LineString': ol.xml.makeChildAppender(
+          ol.format.KML.writePrimitiveGeometry_),
+      'LinearRing': ol.xml.makeChildAppender(
+          ol.format.KML.writePrimitiveGeometry_),
+      'Point': ol.xml.makeChildAppender(
+          ol.format.KML.writePrimitiveGeometry_),
+      'Polygon': ol.xml.makeChildAppender(ol.format.KML.writePolygon_),
+      'Style': ol.xml.makeChildAppender(ol.format.KML.writeStyle_),
+      'address': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'description': ol.xml.makeChildAppender(
+          ol.format.XSD.writeStringTextNode),
+      'name': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'open': ol.xml.makeChildAppender(ol.format.XSD.writeBooleanTextNode),
+      'phoneNumber': ol.xml.makeChildAppender(
+          ol.format.XSD.writeStringTextNode),
+      'styleUrl': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
+      'visibility': ol.xml.makeChildAppender(
+          ol.format.XSD.writeBooleanTextNode)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.KML.PRIMITIVE_GEOMETRY_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'coordinates': ol.xml.makeChildAppender(
+          ol.format.KML.writeCoordinatesTextNode_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.KML.POLYGON_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'outerBoundaryIs': ol.xml.makeChildAppender(
+          ol.format.KML.writeBoundaryIs_),
+      'innerBoundaryIs': ol.xml.makeChildAppender(
+          ol.format.KML.writeBoundaryIs_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.KML.POLY_STYLE_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'color': ol.xml.makeChildAppender(ol.format.KML.writeColorTextNode_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Array.<string>>}
+ * @private
+ */
+ol.format.KML.STYLE_SEQUENCE_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, [
+      'IconStyle', 'LabelStyle', 'LineStyle', 'PolyStyle'
+    ]);
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.KML.STYLE_SERIALIZERS_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, {
+      'IconStyle': ol.xml.makeChildAppender(ol.format.KML.writeIconStyle_),
+      'LabelStyle': ol.xml.makeChildAppender(ol.format.KML.writeLabelStyle_),
+      'LineStyle': ol.xml.makeChildAppender(ol.format.KML.writeLineStyle_),
+      'PolyStyle': ol.xml.makeChildAppender(ol.format.KML.writePolyStyle_)
+    });
+
+
+/**
+ * @const
+ * @param {*} value Value.
+ * @param {Array.<*>} objectStack Object stack.
+ * @param {string=} opt_nodeName Node name.
+ * @return {Node|undefined} Node.
+ * @private
+ */
+ol.format.KML.GX_NODE_FACTORY_ = function(value, objectStack, opt_nodeName) {
+  return ol.xml.createElementNS(ol.format.KML.GX_NAMESPACE_URIS_[0],
+      'gx:' + opt_nodeName);
+};
+
+
+/**
+ * @const
+ * @param {*} value Value.
+ * @param {Array.<*>} objectStack Object stack.
+ * @param {string=} opt_nodeName Node name.
+ * @return {Node|undefined} Node.
+ * @private
+ */
+ol.format.KML.DOCUMENT_NODE_FACTORY_ = function(value, objectStack,
+    opt_nodeName) {
+  goog.asserts.assertInstanceof(value, ol.Feature,
+      'value should be an ol.Feature');
+  var parentNode = objectStack[objectStack.length - 1].node;
+  goog.asserts.assert(ol.xml.isNode(parentNode),
+      'parentNode should be an XML node');
+  return ol.xml.createElementNS(parentNode.namespaceURI, 'Placemark');
+};
+
+
+/**
+ * @const
+ * @param {*} value Value.
+ * @param {Array.<*>} objectStack Object stack.
+ * @param {string=} opt_nodeName Node name.
+ * @return {Node|undefined} Node.
+ * @private
+ */
+ol.format.KML.GEOMETRY_NODE_FACTORY_ = function(value, objectStack,
+    opt_nodeName) {
+  if (value) {
+    goog.asserts.assertInstanceof(value, ol.geom.Geometry,
+        'value should be an ol.geom.Geometry');
+    var parentNode = objectStack[objectStack.length - 1].node;
+    goog.asserts.assert(ol.xml.isNode(parentNode),
+        'parentNode should be an XML node');
+    return ol.xml.createElementNS(parentNode.namespaceURI,
+        ol.format.KML.GEOMETRY_TYPE_TO_NODENAME_[value.getType()]);
+  }
+};
+
+
+/**
+ * A factory for creating coordinates nodes.
+ * @const
+ * @type {function(*, Array.<*>, string=): (Node|undefined)}
+ * @private
+ */
+ol.format.KML.COLOR_NODE_FACTORY_ = ol.xml.makeSimpleNodeFactory('color');
+
+
+/**
+ * A factory for creating coordinates nodes.
+ * @const
+ * @type {function(*, Array.<*>, string=): (Node|undefined)}
+ * @private
+ */
+ol.format.KML.COORDINATES_NODE_FACTORY_ =
+    ol.xml.makeSimpleNodeFactory('coordinates');
+
+
+/**
+ * A factory for creating innerBoundaryIs nodes.
+ * @const
+ * @type {function(*, Array.<*>, string=): (Node|undefined)}
+ * @private
+ */
+ol.format.KML.INNER_BOUNDARY_NODE_FACTORY_ =
+    ol.xml.makeSimpleNodeFactory('innerBoundaryIs');
+
+
+/**
+ * A factory for creating Point nodes.
+ * @const
+ * @type {function(*, Array.<*>, string=): (Node|undefined)}
+ * @private
+ */
+ol.format.KML.POINT_NODE_FACTORY_ =
+    ol.xml.makeSimpleNodeFactory('Point');
+
+
+/**
+ * A factory for creating LineString nodes.
+ * @const
+ * @type {function(*, Array.<*>, string=): (Node|undefined)}
+ * @private
+ */
+ol.format.KML.LINE_STRING_NODE_FACTORY_ =
+    ol.xml.makeSimpleNodeFactory('LineString');
+
+
+/**
+ * A factory for creating LinearRing nodes.
+ * @const
+ * @type {function(*, Array.<*>, string=): (Node|undefined)}
+ * @private
+ */
+ol.format.KML.LINEAR_RING_NODE_FACTORY_ =
+    ol.xml.makeSimpleNodeFactory('LinearRing');
+
+
+/**
+ * A factory for creating Polygon nodes.
+ * @const
+ * @type {function(*, Array.<*>, string=): (Node|undefined)}
+ * @private
+ */
+ol.format.KML.POLYGON_NODE_FACTORY_ =
+    ol.xml.makeSimpleNodeFactory('Polygon');
+
+
+/**
+ * A factory for creating outerBoundaryIs nodes.
+ * @const
+ * @type {function(*, Array.<*>, string=): (Node|undefined)}
+ * @private
+ */
+ol.format.KML.OUTER_BOUNDARY_NODE_FACTORY_ =
+    ol.xml.makeSimpleNodeFactory('outerBoundaryIs');
+
+
+/**
+ * Encode an array of features in the KML format.
+ *
+ * @function
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {olx.format.WriteOptions=} opt_options Options.
+ * @return {string} Result.
+ * @api stable
+ */
+ol.format.KML.prototype.writeFeatures;
+
+
+/**
+ * Encode an array of features in the KML format as an XML node.
+ *
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {olx.format.WriteOptions=} opt_options Options.
+ * @return {Node} Node.
+ * @api
+ */
+ol.format.KML.prototype.writeFeaturesNode = function(features, opt_options) {
+  opt_options = this.adaptOptions(opt_options);
+  var kml = ol.xml.createElementNS(ol.format.KML.NAMESPACE_URIS_[4], 'kml');
+  var xmlnsUri = 'http://www.w3.org/2000/xmlns/';
+  var xmlSchemaInstanceUri = 'http://www.w3.org/2001/XMLSchema-instance';
+  ol.xml.setAttributeNS(kml, xmlnsUri, 'xmlns:gx',
+      ol.format.KML.GX_NAMESPACE_URIS_[0]);
+  ol.xml.setAttributeNS(kml, xmlnsUri, 'xmlns:xsi', xmlSchemaInstanceUri);
+  ol.xml.setAttributeNS(kml, xmlSchemaInstanceUri, 'xsi:schemaLocation',
+      ol.format.KML.SCHEMA_LOCATION_);
+
+  var /** @type {ol.xml.NodeStackItem} */ context = {node: kml};
+  var properties = {};
+  if (features.length > 1) {
+    properties['Document'] = features;
+  } else if (features.length == 1) {
+    properties['Placemark'] = features[0];
+  }
+  var orderedKeys = ol.format.KML.KML_SEQUENCE_[kml.namespaceURI];
+  var values = ol.xml.makeSequence(properties, orderedKeys);
+  ol.xml.pushSerializeAndPop(context, ol.format.KML.KML_SERIALIZERS_,
+      ol.xml.OBJECT_PROPERTY_NODE_FACTORY, values, [opt_options], orderedKeys,
+      this);
+  return kml;
+};
+
+goog.provide('ol.ext.pbf');
+/** @typedef {function(*)} */
+ol.ext.pbf;
+(function() {
+var exports = {};
+var module = {exports: exports};
+var define;
+/**
+ * @fileoverview
+ * @suppress {accessControls, ambiguousFunctionDecl, checkDebuggerStatement, checkRegExp, checkTypes, checkVars, const, constantProperty, deprecated, duplicate, es5Strict, fileoverviewTags, missingProperties, nonStandardJsDocs, strictModuleDepCheck, suspiciousCode, undefinedNames, undefinedVars, unknownDefines, uselessCode, visibility}
+ */
+(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.pbf = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
+'use strict';
+
+// lightweight Buffer shim for pbf browser build
+// based on code from github.com/feross/buffer (MIT-licensed)
+
+module.exports = Buffer;
+
+var ieee754 = _dereq_('ieee754');
+
+var BufferMethods;
+
+function Buffer(length) {
+    var arr;
+    if (length && length.length) {
+        arr = length;
+        length = arr.length;
+    }
+    var buf = new Uint8Array(length || 0);
+    if (arr) buf.set(arr);
+
+    buf.readUInt32LE = BufferMethods.readUInt32LE;
+    buf.writeUInt32LE = BufferMethods.writeUInt32LE;
+    buf.readInt32LE = BufferMethods.readInt32LE;
+    buf.writeInt32LE = BufferMethods.writeInt32LE;
+    buf.readFloatLE = BufferMethods.readFloatLE;
+    buf.writeFloatLE = BufferMethods.writeFloatLE;
+    buf.readDoubleLE = BufferMethods.readDoubleLE;
+    buf.writeDoubleLE = BufferMethods.writeDoubleLE;
+    buf.toString = BufferMethods.toString;
+    buf.write = BufferMethods.write;
+    buf.slice = BufferMethods.slice;
+    buf.copy = BufferMethods.copy;
+
+    buf._isBuffer = true;
+    return buf;
+}
+
+var lastStr, lastStrEncoded;
+
+BufferMethods = {
+    readUInt32LE: function(pos) {
+        return ((this[pos]) |
+            (this[pos + 1] << 8) |
+            (this[pos + 2] << 16)) +
+            (this[pos + 3] * 0x1000000);
+    },
+
+    writeUInt32LE: function(val, pos) {
+        this[pos] = val;
+        this[pos + 1] = (val >>> 8);
+        this[pos + 2] = (val >>> 16);
+        this[pos + 3] = (val >>> 24);
+    },
+
+    readInt32LE: function(pos) {
+        return ((this[pos]) |
+            (this[pos + 1] << 8) |
+            (this[pos + 2] << 16)) +
+            (this[pos + 3] << 24);
+    },
+
+    readFloatLE:  function(pos) { return ieee754.read(this, pos, true, 23, 4); },
+    readDoubleLE: function(pos) { return ieee754.read(this, pos, true, 52, 8); },
+
+    writeFloatLE:  function(val, pos) { return ieee754.write(this, val, pos, true, 23, 4); },
+    writeDoubleLE: function(val, pos) { return ieee754.write(this, val, pos, true, 52, 8); },
+
+    toString: function(encoding, start, end) {
+        var str = '',
+            tmp = '';
+
+        start = start || 0;
+        end = Math.min(this.length, end || this.length);
+
+        for (var i = start; i < end; i++) {
+            var ch = this[i];
+            if (ch <= 0x7F) {
+                str += decodeURIComponent(tmp) + String.fromCharCode(ch);
+                tmp = '';
+            } else {
+                tmp += '%' + ch.toString(16);
+            }
+        }
+
+        str += decodeURIComponent(tmp);
+
+        return str;
+    },
+
+    write: function(str, pos) {
+        var bytes = str === lastStr ? lastStrEncoded : encodeString(str);
+        for (var i = 0; i < bytes.length; i++) {
+            this[pos + i] = bytes[i];
+        }
+    },
+
+    slice: function(start, end) {
+        return this.subarray(start, end);
+    },
+
+    copy: function(buf, pos) {
+        pos = pos || 0;
+        for (var i = 0; i < this.length; i++) {
+            buf[pos + i] = this[i];
+        }
+    }
+};
+
+BufferMethods.writeInt32LE = BufferMethods.writeUInt32LE;
+
+Buffer.byteLength = function(str) {
+    lastStr = str;
+    lastStrEncoded = encodeString(str);
+    return lastStrEncoded.length;
+};
+
+Buffer.isBuffer = function(buf) {
+    return !!(buf && buf._isBuffer);
+};
+
+function encodeString(str) {
+    var length = str.length,
+        bytes = [];
+
+    for (var i = 0, c, lead; i < length; i++) {
+        c = str.charCodeAt(i); // code point
+
+        if (c > 0xD7FF && c < 0xE000) {
+
+            if (lead) {
+                if (c < 0xDC00) {
+                    bytes.push(0xEF, 0xBF, 0xBD);
+                    lead = c;
+                    continue;
+
+                } else {
+                    c = lead - 0xD800 << 10 | c - 0xDC00 | 0x10000;
+                    lead = null;
+                }
+
+            } else {
+                if (c > 0xDBFF || (i + 1 === length)) bytes.push(0xEF, 0xBF, 0xBD);
+                else lead = c;
+
+                continue;
+            }
+
+        } else if (lead) {
+            bytes.push(0xEF, 0xBF, 0xBD);
+            lead = null;
+        }
+
+        if (c < 0x80) bytes.push(c);
+        else if (c < 0x800) bytes.push(c >> 0x6 | 0xC0, c & 0x3F | 0x80);
+        else if (c < 0x10000) bytes.push(c >> 0xC | 0xE0, c >> 0x6 & 0x3F | 0x80, c & 0x3F | 0x80);
+        else bytes.push(c >> 0x12 | 0xF0, c >> 0xC & 0x3F | 0x80, c >> 0x6 & 0x3F | 0x80, c & 0x3F | 0x80);
+    }
+    return bytes;
+}
+
+},{"ieee754":3}],2:[function(_dereq_,module,exports){
+(function (global){
+'use strict';
+
+module.exports = Pbf;
+
+var Buffer = global.Buffer || _dereq_('./buffer');
+
+function Pbf(buf) {
+    this.buf = !Buffer.isBuffer(buf) ? new Buffer(buf || 0) : buf;
+    this.pos = 0;
+    this.length = this.buf.length;
+}
+
+Pbf.Varint  = 0; // varint: int32, int64, uint32, uint64, sint32, sint64, bool, enum
+Pbf.Fixed64 = 1; // 64-bit: double, fixed64, sfixed64
+Pbf.Bytes   = 2; // length-delimited: string, bytes, embedded messages, packed repeated fields
+Pbf.Fixed32 = 5; // 32-bit: float, fixed32, sfixed32
+
+var SHIFT_LEFT_32 = (1 << 16) * (1 << 16),
+    SHIFT_RIGHT_32 = 1 / SHIFT_LEFT_32,
+    POW_2_63 = Math.pow(2, 63);
+
+Pbf.prototype = {
+
+    destroy: function() {
+        this.buf = null;
+    },
+
+    // === READING =================================================================
+
+    readFields: function(readField, result, end) {
+        end = end || this.length;
+
+        while (this.pos < end) {
+            var val = this.readVarint(),
+                tag = val >> 3,
+                startPos = this.pos;
+
+            readField(tag, result, this);
+
+            if (this.pos === startPos) this.skip(val);
+        }
+        return result;
+    },
+
+    readMessage: function(readField, result) {
+        return this.readFields(readField, result, this.readVarint() + this.pos);
+    },
+
+    readFixed32: function() {
+        var val = this.buf.readUInt32LE(this.pos);
+        this.pos += 4;
+        return val;
+    },
+
+    readSFixed32: function() {
+        var val = this.buf.readInt32LE(this.pos);
+        this.pos += 4;
+        return val;
+    },
+
+    // 64-bit int handling is based on github.com/dpw/node-buffer-more-ints (MIT-licensed)
+
+    readFixed64: function() {
+        var val = this.buf.readUInt32LE(this.pos) + this.buf.readUInt32LE(this.pos + 4) * SHIFT_LEFT_32;
+        this.pos += 8;
+        return val;
+    },
+
+    readSFixed64: function() {
+        var val = this.buf.readUInt32LE(this.pos) + this.buf.readInt32LE(this.pos + 4) * SHIFT_LEFT_32;
+        this.pos += 8;
+        return val;
+    },
+
+    readFloat: function() {
+        var val = this.buf.readFloatLE(this.pos);
+        this.pos += 4;
+        return val;
+    },
+
+    readDouble: function() {
+        var val = this.buf.readDoubleLE(this.pos);
+        this.pos += 8;
+        return val;
+    },
+
+    readVarint: function() {
+        var buf = this.buf,
+            val, b, b0, b1, b2, b3;
+
+        b0 = buf[this.pos++]; if (b0 < 0x80) return b0;                 b0 = b0 & 0x7f;
+        b1 = buf[this.pos++]; if (b1 < 0x80) return b0 | b1 << 7;       b1 = (b1 & 0x7f) << 7;
+        b2 = buf[this.pos++]; if (b2 < 0x80) return b0 | b1 | b2 << 14; b2 = (b2 & 0x7f) << 14;
+        b3 = buf[this.pos++]; if (b3 < 0x80) return b0 | b1 | b2 | b3 << 21;
+
+        val = b0 | b1 | b2 | (b3 & 0x7f) << 21;
+
+        b = buf[this.pos++]; val += (b & 0x7f) * 0x10000000;         if (b < 0x80) return val;
+        b = buf[this.pos++]; val += (b & 0x7f) * 0x800000000;        if (b < 0x80) return val;
+        b = buf[this.pos++]; val += (b & 0x7f) * 0x40000000000;      if (b < 0x80) return val;
+        b = buf[this.pos++]; val += (b & 0x7f) * 0x2000000000000;    if (b < 0x80) return val;
+        b = buf[this.pos++]; val += (b & 0x7f) * 0x100000000000000;  if (b < 0x80) return val;
+        b = buf[this.pos++]; val += (b & 0x7f) * 0x8000000000000000; if (b < 0x80) return val;
+
+        throw new Error('Expected varint not more than 10 bytes');
+    },
+
+    readVarint64: function() {
+        var startPos = this.pos,
+            val = this.readVarint();
+
+        if (val < POW_2_63) return val;
+
+        var pos = this.pos - 2;
+        while (this.buf[pos] === 0xff) pos--;
+        if (pos < startPos) pos = startPos;
+
+        val = 0;
+        for (var i = 0; i < pos - startPos + 1; i++) {
+            var b = ~this.buf[startPos + i] & 0x7f;
+            val += i < 4 ? b << i * 7 : b * Math.pow(2, i * 7);
+        }
+
+        return -val - 1;
+    },
+
+    readSVarint: function() {
+        var num = this.readVarint();
+        return num % 2 === 1 ? (num + 1) / -2 : num / 2; // zigzag encoding
+    },
+
+    readBoolean: function() {
+        return Boolean(this.readVarint());
+    },
+
+    readString: function() {
+        var end = this.readVarint() + this.pos,
+            str = this.buf.toString('utf8', this.pos, end);
+        this.pos = end;
+        return str;
+    },
+
+    readBytes: function() {
+        var end = this.readVarint() + this.pos,
+            buffer = this.buf.slice(this.pos, end);
+        this.pos = end;
+        return buffer;
+    },
+
+    // verbose for performance reasons; doesn't affect gzipped size
+
+    readPackedVarint: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readVarint());
+        return arr;
+    },
+    readPackedSVarint: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readSVarint());
+        return arr;
+    },
+    readPackedBoolean: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readBoolean());
+        return arr;
+    },
+    readPackedFloat: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readFloat());
+        return arr;
+    },
+    readPackedDouble: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readDouble());
+        return arr;
+    },
+    readPackedFixed32: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readFixed32());
+        return arr;
+    },
+    readPackedSFixed32: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readSFixed32());
+        return arr;
+    },
+    readPackedFixed64: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readFixed64());
+        return arr;
+    },
+    readPackedSFixed64: function() {
+        var end = this.readVarint() + this.pos, arr = [];
+        while (this.pos < end) arr.push(this.readSFixed64());
+        return arr;
+    },
+
+    skip: function(val) {
+        var type = val & 0x7;
+        if (type === Pbf.Varint) while (this.buf[this.pos++] > 0x7f) {}
+        else if (type === Pbf.Bytes) this.pos = this.readVarint() + this.pos;
+        else if (type === Pbf.Fixed32) this.pos += 4;
+        else if (type === Pbf.Fixed64) this.pos += 8;
+        else throw new Error('Unimplemented type: ' + type);
+    },
+
+    // === WRITING =================================================================
+
+    writeTag: function(tag, type) {
+        this.writeVarint((tag << 3) | type);
+    },
+
+    realloc: function(min) {
+        var length = this.length || 16;
+
+        while (length < this.pos + min) length *= 2;
+
+        if (length !== this.length) {
+            var buf = new Buffer(length);
+            this.buf.copy(buf);
+            this.buf = buf;
+            this.length = length;
+        }
+    },
+
+    finish: function() {
+        this.length = this.pos;
+        this.pos = 0;
+        return this.buf.slice(0, this.length);
+    },
+
+    writeFixed32: function(val) {
+        this.realloc(4);
+        this.buf.writeUInt32LE(val, this.pos);
+        this.pos += 4;
+    },
+
+    writeSFixed32: function(val) {
+        this.realloc(4);
+        this.buf.writeInt32LE(val, this.pos);
+        this.pos += 4;
+    },
+
+    writeFixed64: function(val) {
+        this.realloc(8);
+        this.buf.writeInt32LE(val & -1, this.pos);
+        this.buf.writeUInt32LE(Math.floor(val * SHIFT_RIGHT_32), this.pos + 4);
+        this.pos += 8;
+    },
+
+    writeSFixed64: function(val) {
+        this.realloc(8);
+        this.buf.writeInt32LE(val & -1, this.pos);
+        this.buf.writeInt32LE(Math.floor(val * SHIFT_RIGHT_32), this.pos + 4);
+        this.pos += 8;
+    },
+
+    writeVarint: function(val) {
+        val = +val;
+
+        if (val <= 0x7f) {
+            this.realloc(1);
+            this.buf[this.pos++] = val;
+
+        } else if (val <= 0x3fff) {
+            this.realloc(2);
+            this.buf[this.pos++] = ((val >>> 0) & 0x7f) | 0x80;
+            this.buf[this.pos++] = ((val >>> 7) & 0x7f);
+
+        } else if (val <= 0x1fffff) {
+            this.realloc(3);
+            this.buf[this.pos++] = ((val >>> 0) & 0x7f) | 0x80;
+            this.buf[this.pos++] = ((val >>> 7) & 0x7f) | 0x80;
+            this.buf[this.pos++] = ((val >>> 14) & 0x7f);
+
+        } else if (val <= 0xfffffff) {
+            this.realloc(4);
+            this.buf[this.pos++] = ((val >>> 0) & 0x7f) | 0x80;
+            this.buf[this.pos++] = ((val >>> 7) & 0x7f) | 0x80;
+            this.buf[this.pos++] = ((val >>> 14) & 0x7f) | 0x80;
+            this.buf[this.pos++] = ((val >>> 21) & 0x7f);
+
+        } else {
+            var pos = this.pos;
+            while (val >= 0x80) {
+                this.realloc(1);
+                this.buf[this.pos++] = (val & 0xff) | 0x80;
+                val /= 0x80;
+            }
+            this.realloc(1);
+            this.buf[this.pos++] = val | 0;
+            if (this.pos - pos > 10) throw new Error('Given varint doesn\'t fit into 10 bytes');
+        }
+    },
+
+    writeSVarint: function(val) {
+        this.writeVarint(val < 0 ? -val * 2 - 1 : val * 2);
+    },
+
+    writeBoolean: function(val) {
+        this.writeVarint(Boolean(val));
+    },
+
+    writeString: function(str) {
+        str = String(str);
+        var bytes = Buffer.byteLength(str);
+        this.writeVarint(bytes);
+        this.realloc(bytes);
+        this.buf.write(str, this.pos);
+        this.pos += bytes;
+    },
+
+    writeFloat: function(val) {
+        this.realloc(4);
+        this.buf.writeFloatLE(val, this.pos);
+        this.pos += 4;
+    },
+
+    writeDouble: function(val) {
+        this.realloc(8);
+        this.buf.writeDoubleLE(val, this.pos);
+        this.pos += 8;
+    },
+
+    writeBytes: function(buffer) {
+        var len = buffer.length;
+        this.writeVarint(len);
+        this.realloc(len);
+        for (var i = 0; i < len; i++) this.buf[this.pos++] = buffer[i];
+    },
+
+    writeRawMessage: function(fn, obj) {
+        this.pos++; // reserve 1 byte for short message length
+
+        // write the message directly to the buffer and see how much was written
+        var startPos = this.pos;
+        fn(obj, this);
+        var len = this.pos - startPos;
+
+        var varintLen =
+            len <= 0x7f ? 1 :
+            len <= 0x3fff ? 2 :
+            len <= 0x1fffff ? 3 :
+            len <= 0xfffffff ? 4 : Math.ceil(Math.log(len) / (Math.LN2 * 7));
+
+        // if 1 byte isn't enough for encoding message length, shift the data to the right
+        if (varintLen > 1) {
+            this.realloc(varintLen - 1);
+            for (var i = this.pos - 1; i >= startPos; i--) this.buf[i + varintLen - 1] = this.buf[i];
+        }
+
+        // finally, write the message length in the reserved place and restore the position
+        this.pos = startPos - 1;
+        this.writeVarint(len);
+        this.pos += len;
+    },
+
+    writeMessage: function(tag, fn, obj) {
+        this.writeTag(tag, Pbf.Bytes);
+        this.writeRawMessage(fn, obj);
+    },
+
+    writePackedVarint:   function(tag, arr) { this.writeMessage(tag, writePackedVarint, arr);   },
+    writePackedSVarint:  function(tag, arr) { this.writeMessage(tag, writePackedSVarint, arr);  },
+    writePackedBoolean:  function(tag, arr) { this.writeMessage(tag, writePackedBoolean, arr);  },
+    writePackedFloat:    function(tag, arr) { this.writeMessage(tag, writePackedFloat, arr);    },
+    writePackedDouble:   function(tag, arr) { this.writeMessage(tag, writePackedDouble, arr);   },
+    writePackedFixed32:  function(tag, arr) { this.writeMessage(tag, writePackedFixed32, arr);  },
+    writePackedSFixed32: function(tag, arr) { this.writeMessage(tag, writePackedSFixed32, arr); },
+    writePackedFixed64:  function(tag, arr) { this.writeMessage(tag, writePackedFixed64, arr);  },
+    writePackedSFixed64: function(tag, arr) { this.writeMessage(tag, writePackedSFixed64, arr); },
+
+    writeBytesField: function(tag, buffer) {
+        this.writeTag(tag, Pbf.Bytes);
+        this.writeBytes(buffer);
+    },
+    writeFixed32Field: function(tag, val) {
+        this.writeTag(tag, Pbf.Fixed32);
+        this.writeFixed32(val);
+    },
+    writeSFixed32Field: function(tag, val) {
+        this.writeTag(tag, Pbf.Fixed32);
+        this.writeSFixed32(val);
+    },
+    writeFixed64Field: function(tag, val) {
+        this.writeTag(tag, Pbf.Fixed64);
+        this.writeFixed64(val);
+    },
+    writeSFixed64Field: function(tag, val) {
+        this.writeTag(tag, Pbf.Fixed64);
+        this.writeSFixed64(val);
+    },
+    writeVarintField: function(tag, val) {
+        this.writeTag(tag, Pbf.Varint);
+        this.writeVarint(val);
+    },
+    writeSVarintField: function(tag, val) {
+        this.writeTag(tag, Pbf.Varint);
+        this.writeSVarint(val);
+    },
+    writeStringField: function(tag, str) {
+        this.writeTag(tag, Pbf.Bytes);
+        this.writeString(str);
+    },
+    writeFloatField: function(tag, val) {
+        this.writeTag(tag, Pbf.Fixed32);
+        this.writeFloat(val);
+    },
+    writeDoubleField: function(tag, val) {
+        this.writeTag(tag, Pbf.Fixed64);
+        this.writeDouble(val);
+    },
+    writeBooleanField: function(tag, val) {
+        this.writeVarintField(tag, Boolean(val));
+    }
+};
+
+function writePackedVarint(arr, pbf)   { for (var i = 0; i < arr.length; i++) pbf.writeVarint(arr[i]);   }
+function writePackedSVarint(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeSVarint(arr[i]);  }
+function writePackedFloat(arr, pbf)    { for (var i = 0; i < arr.length; i++) pbf.writeFloat(arr[i]);    }
+function writePackedDouble(arr, pbf)   { for (var i = 0; i < arr.length; i++) pbf.writeDouble(arr[i]);   }
+function writePackedBoolean(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeBoolean(arr[i]);  }
+function writePackedFixed32(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeFixed32(arr[i]);  }
+function writePackedSFixed32(arr, pbf) { for (var i = 0; i < arr.length; i++) pbf.writeSFixed32(arr[i]); }
+function writePackedFixed64(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeFixed64(arr[i]);  }
+function writePackedSFixed64(arr, pbf) { for (var i = 0; i < arr.length; i++) pbf.writeSFixed64(arr[i]); }
+
+}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+},{"./buffer":1}],3:[function(_dereq_,module,exports){
+exports.read = function (buffer, offset, isLE, mLen, nBytes) {
+  var e, m
+  var eLen = nBytes * 8 - mLen - 1
+  var eMax = (1 << eLen) - 1
+  var eBias = eMax >> 1
+  var nBits = -7
+  var i = isLE ? (nBytes - 1) : 0
+  var d = isLE ? -1 : 1
+  var s = buffer[offset + i]
+
+  i += d
+
+  e = s & ((1 << (-nBits)) - 1)
+  s >>= (-nBits)
+  nBits += eLen
+  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}
+
+  m = e & ((1 << (-nBits)) - 1)
+  e >>= (-nBits)
+  nBits += mLen
+  for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}
+
+  if (e === 0) {
+    e = 1 - eBias
+  } else if (e === eMax) {
+    return m ? NaN : ((s ? -1 : 1) * Infinity)
+  } else {
+    m = m + Math.pow(2, mLen)
+    e = e - eBias
+  }
+  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
+}
+
+exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
+  var e, m, c
+  var eLen = nBytes * 8 - mLen - 1
+  var eMax = (1 << eLen) - 1
+  var eBias = eMax >> 1
+  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
+  var i = isLE ? 0 : (nBytes - 1)
+  var d = isLE ? 1 : -1
+  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0
+
+  value = Math.abs(value)
+
+  if (isNaN(value) || value === Infinity) {
+    m = isNaN(value) ? 1 : 0
+    e = eMax
+  } else {
+    e = Math.floor(Math.log(value) / Math.LN2)
+    if (value * (c = Math.pow(2, -e)) < 1) {
+      e--
+      c *= 2
+    }
+    if (e + eBias >= 1) {
+      value += rt / c
+    } else {
+      value += rt * Math.pow(2, 1 - eBias)
+    }
+    if (value * c >= 2) {
+      e++
+      c /= 2
+    }
+
+    if (e + eBias >= eMax) {
+      m = 0
+      e = eMax
+    } else if (e + eBias >= 1) {
+      m = (value * c - 1) * Math.pow(2, mLen)
+      e = e + eBias
+    } else {
+      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
+      e = 0
+    }
+  }
+
+  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
+
+  e = (e << mLen) | m
+  eLen += mLen
+  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
+
+  buffer[offset + i - d] |= s * 128
+}
+
+},{}]},{},[2])(2)
+});
+ol.ext.pbf = module.exports;
+})();
+
+goog.provide('ol.ext.vectortile');
+/** @typedef {function(*)} */
+ol.ext.vectortile;
+(function() {
+var exports = {};
+var module = {exports: exports};
+var define;
+/**
+ * @fileoverview
+ * @suppress {accessControls, ambiguousFunctionDecl, checkDebuggerStatement, checkRegExp, checkTypes, checkVars, const, constantProperty, deprecated, duplicate, es5Strict, fileoverviewTags, missingProperties, nonStandardJsDocs, strictModuleDepCheck, suspiciousCode, undefinedNames, undefinedVars, unknownDefines, uselessCode, visibility}
+ */
+(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.vectortile = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
+module.exports.VectorTile = _dereq_('./lib/vectortile.js');
+module.exports.VectorTileFeature = _dereq_('./lib/vectortilefeature.js');
+module.exports.VectorTileLayer = _dereq_('./lib/vectortilelayer.js');
+
+},{"./lib/vectortile.js":2,"./lib/vectortilefeature.js":3,"./lib/vectortilelayer.js":4}],2:[function(_dereq_,module,exports){
+'use strict';
+
+var VectorTileLayer = _dereq_('./vectortilelayer');
+
+module.exports = VectorTile;
+
+function VectorTile(pbf, end) {
+    this.layers = pbf.readFields(readTile, {}, end);
+}
+
+function readTile(tag, layers, pbf) {
+    if (tag === 3) {
+        var layer = new VectorTileLayer(pbf, pbf.readVarint() + pbf.pos);
+        if (layer.length) layers[layer.name] = layer;
+    }
+}
+
+
+},{"./vectortilelayer":4}],3:[function(_dereq_,module,exports){
+'use strict';
+
+var Point = _dereq_('point-geometry');
+
+module.exports = VectorTileFeature;
+
+function VectorTileFeature(pbf, end, extent, keys, values) {
+    // Public
+    this.properties = {};
+    this.extent = extent;
+    this.type = 0;
+
+    // Private
+    this._pbf = pbf;
+    this._geometry = -1;
+    this._keys = keys;
+    this._values = values;
+
+    pbf.readFields(readFeature, this, end);
+}
+
+function readFeature(tag, feature, pbf) {
+    if (tag == 1) feature._id = pbf.readVarint();
+    else if (tag == 2) readTag(pbf, feature);
+    else if (tag == 3) feature.type = pbf.readVarint();
+    else if (tag == 4) feature._geometry = pbf.pos;
+}
+
+function readTag(pbf, feature) {
+    var end = pbf.readVarint() + pbf.pos;
+
+    while (pbf.pos < end) {
+        var key = feature._keys[pbf.readVarint()],
+            value = feature._values[pbf.readVarint()];
+        feature.properties[key] = value;
+    }
+}
+
+VectorTileFeature.types = ['Unknown', 'Point', 'LineString', 'Polygon'];
+
+VectorTileFeature.prototype.loadGeometry = function() {
+    var pbf = this._pbf;
+    pbf.pos = this._geometry;
+
+    var end = pbf.readVarint() + pbf.pos,
+        cmd = 1,
+        length = 0,
+        x = 0,
+        y = 0,
+        lines = [],
+        line;
+
+    while (pbf.pos < end) {
+        if (!length) {
+            var cmdLen = pbf.readVarint();
+            cmd = cmdLen & 0x7;
+            length = cmdLen >> 3;
+        }
+
+        length--;
+
+        if (cmd === 1 || cmd === 2) {
+            x += pbf.readSVarint();
+            y += pbf.readSVarint();
+
+            if (cmd === 1) { // moveTo
+                if (line) lines.push(line);
+                line = [];
+            }
+
+            line.push(new Point(x, y));
+
+        } else if (cmd === 7) {
+
+            // Workaround for https://github.com/mapbox/mapnik-vector-tile/issues/90
+            if (line) {
+                line.push(line[0].clone()); // closePolygon
+            }
+
+        } else {
+            throw new Error('unknown command ' + cmd);
+        }
+    }
+
+    if (line) lines.push(line);
+
+    return lines;
+};
+
+VectorTileFeature.prototype.bbox = function() {
+    var pbf = this._pbf;
+    pbf.pos = this._geometry;
+
+    var end = pbf.readVarint() + pbf.pos,
+        cmd = 1,
+        length = 0,
+        x = 0,
+        y = 0,
+        x1 = Infinity,
+        x2 = -Infinity,
+        y1 = Infinity,
+        y2 = -Infinity;
+
+    while (pbf.pos < end) {
+        if (!length) {
+            var cmdLen = pbf.readVarint();
+            cmd = cmdLen & 0x7;
+            length = cmdLen >> 3;
+        }
+
+        length--;
+
+        if (cmd === 1 || cmd === 2) {
+            x += pbf.readSVarint();
+            y += pbf.readSVarint();
+            if (x < x1) x1 = x;
+            if (x > x2) x2 = x;
+            if (y < y1) y1 = y;
+            if (y > y2) y2 = y;
+
+        } else if (cmd !== 7) {
+            throw new Error('unknown command ' + cmd);
+        }
+    }
+
+    return [x1, y1, x2, y2];
+};
+
+VectorTileFeature.prototype.toGeoJSON = function(x, y, z) {
+    var size = this.extent * Math.pow(2, z),
+        x0 = this.extent * x,
+        y0 = this.extent * y,
+        coords = this.loadGeometry(),
+        type = VectorTileFeature.types[this.type];
+
+    for (var i = 0; i < coords.length; i++) {
+        var line = coords[i];
+        for (var j = 0; j < line.length; j++) {
+            var p = line[j], y2 = 180 - (p.y + y0) * 360 / size;
+            line[j] = [
+                (p.x + x0) * 360 / size - 180,
+                360 / Math.PI * Math.atan(Math.exp(y2 * Math.PI / 180)) - 90
+            ];
+        }
+    }
+
+    if (type === 'Point' && coords.length === 1) {
+        coords = coords[0][0];
+    } else if (type === 'Point') {
+        coords = coords[0];
+        type = 'MultiPoint';
+    } else if (type === 'LineString' && coords.length === 1) {
+        coords = coords[0];
+    } else if (type === 'LineString') {
+        type = 'MultiLineString';
+    }
+
+    var result = {
+        type: "Feature",
+        geometry: {
+            type: type,
+            coordinates: coords
+        },
+        properties: this.properties
+    };
+
+    if ('_id' in this) {
+        result.id = this._id;
+    }
+
+    return result;
+};
+
+},{"point-geometry":5}],4:[function(_dereq_,module,exports){
+'use strict';
+
+var VectorTileFeature = _dereq_('./vectortilefeature.js');
+
+module.exports = VectorTileLayer;
+
+function VectorTileLayer(pbf, end) {
+    // Public
+    this.version = 1;
+    this.name = null;
+    this.extent = 4096;
+    this.length = 0;
+
+    // Private
+    this._pbf = pbf;
+    this._keys = [];
+    this._values = [];
+    this._features = [];
+
+    pbf.readFields(readLayer, this, end);
+
+    this.length = this._features.length;
+}
+
+function readLayer(tag, layer, pbf) {
+    if (tag === 15) layer.version = pbf.readVarint();
+    else if (tag === 1) layer.name = pbf.readString();
+    else if (tag === 5) layer.extent = pbf.readVarint();
+    else if (tag === 2) layer._features.push(pbf.pos);
+    else if (tag === 3) layer._keys.push(pbf.readString());
+    else if (tag === 4) layer._values.push(readValueMessage(pbf));
+}
+
+function readValueMessage(pbf) {
+    var value = null,
+        end = pbf.readVarint() + pbf.pos;
+
+    while (pbf.pos < end) {
+        var tag = pbf.readVarint() >> 3;
+
+        value = tag === 1 ? pbf.readString() :
+            tag === 2 ? pbf.readFloat() :
+            tag === 3 ? pbf.readDouble() :
+            tag === 4 ? pbf.readVarint64() :
+            tag === 5 ? pbf.readVarint() :
+            tag === 6 ? pbf.readSVarint() :
+            tag === 7 ? pbf.readBoolean() : null;
+    }
+
+    return value;
+}
+
+// return feature `i` from this layer as a `VectorTileFeature`
+VectorTileLayer.prototype.feature = function(i) {
+    if (i < 0 || i >= this._features.length) throw new Error('feature index out of bounds');
+
+    this._pbf.pos = this._features[i];
+
+    var end = this._pbf.readVarint() + this._pbf.pos;
+    return new VectorTileFeature(this._pbf, end, this.extent, this._keys, this._values);
+};
+
+},{"./vectortilefeature.js":3}],5:[function(_dereq_,module,exports){
+'use strict';
+
+module.exports = Point;
+
+function Point(x, y) {
+    this.x = x;
+    this.y = y;
+}
+
+Point.prototype = {
+    clone: function() { return new Point(this.x, this.y); },
+
+    add:     function(p) { return this.clone()._add(p);     },
+    sub:     function(p) { return this.clone()._sub(p);     },
+    mult:    function(k) { return this.clone()._mult(k);    },
+    div:     function(k) { return this.clone()._div(k);     },
+    rotate:  function(a) { return this.clone()._rotate(a);  },
+    matMult: function(m) { return this.clone()._matMult(m); },
+    unit:    function() { return this.clone()._unit(); },
+    perp:    function() { return this.clone()._perp(); },
+    round:   function() { return this.clone()._round(); },
+
+    mag: function() {
+        return Math.sqrt(this.x * this.x + this.y * this.y);
+    },
+
+    equals: function(p) {
+        return this.x === p.x &&
+               this.y === p.y;
+    },
+
+    dist: function(p) {
+        return Math.sqrt(this.distSqr(p));
+    },
+
+    distSqr: function(p) {
+        var dx = p.x - this.x,
+            dy = p.y - this.y;
+        return dx * dx + dy * dy;
+    },
+
+    angle: function() {
+        return Math.atan2(this.y, this.x);
+    },
+
+    angleTo: function(b) {
+        return Math.atan2(this.y - b.y, this.x - b.x);
+    },
+
+    angleWith: function(b) {
+        return this.angleWithSep(b.x, b.y);
+    },
+
+    // Find the angle of the two vectors, solving the formula for the cross product a x b = |a||b|sin(θ) for θ.
+    angleWithSep: function(x, y) {
+        return Math.atan2(
+            this.x * y - this.y * x,
+            this.x * x + this.y * y);
+    },
+
+    _matMult: function(m) {
+        var x = m[0] * this.x + m[1] * this.y,
+            y = m[2] * this.x + m[3] * this.y;
+        this.x = x;
+        this.y = y;
+        return this;
+    },
+
+    _add: function(p) {
+        this.x += p.x;
+        this.y += p.y;
+        return this;
+    },
+
+    _sub: function(p) {
+        this.x -= p.x;
+        this.y -= p.y;
+        return this;
+    },
+
+    _mult: function(k) {
+        this.x *= k;
+        this.y *= k;
+        return this;
+    },
+
+    _div: function(k) {
+        this.x /= k;
+        this.y /= k;
+        return this;
+    },
+
+    _unit: function() {
+        this._div(this.mag());
+        return this;
+    },
+
+    _perp: function() {
+        var y = this.y;
+        this.y = this.x;
+        this.x = -y;
+        return this;
+    },
+
+    _rotate: function(angle) {
+        var cos = Math.cos(angle),
+            sin = Math.sin(angle),
+            x = cos * this.x - sin * this.y,
+            y = sin * this.x + cos * this.y;
+        this.x = x;
+        this.y = y;
+        return this;
+    },
+
+    _round: function() {
+        this.x = Math.round(this.x);
+        this.y = Math.round(this.y);
+        return this;
+    }
+};
+
+// constructs Point from an array if necessary
+Point.convert = function (a) {
+    if (a instanceof Point) {
+        return a;
+    }
+    if (Array.isArray(a)) {
+        return new Point(a[0], a[1]);
+    }
+    return a;
+};
+
+},{}]},{},[1])(1)
+});
+ol.ext.vectortile = module.exports;
+})();
+
+//FIXME Implement projection handling
+
+goog.provide('ol.format.MVT');
+
+goog.require('goog.asserts');
+goog.require('ol.Feature');
+goog.require('ol.ext.pbf');
+goog.require('ol.ext.vectortile');
+goog.require('ol.format.Feature');
+goog.require('ol.format.FormatType');
+goog.require('ol.geom.Geometry');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.GeometryType');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.MultiLineString');
+goog.require('ol.geom.MultiPoint');
+goog.require('ol.geom.Point');
+goog.require('ol.geom.Polygon');
+goog.require('ol.proj');
+goog.require('ol.proj.Projection');
+goog.require('ol.proj.Units');
+goog.require('ol.render.Feature');
+
+
+
+/**
+ * @classdesc
+ * Feature format for reading data in the Mapbox MVT format.
+ *
+ * @constructor
+ * @extends {ol.format.Feature}
+ * @param {olx.format.MVTOptions=} opt_options Options.
+ * @api
+ */
+ol.format.MVT = function(opt_options) {
+
+  goog.base(this);
+
+  var options = opt_options ? opt_options : {};
+
+  /**
+   * @type {ol.proj.Projection}
+   */
+  this.defaultDataProjection = new ol.proj.Projection({
+    code: 'EPSG:3857',
+    units: ol.proj.Units.TILE_PIXELS
+  });
+
+  /**
+   * @private
+   * @type {function((ol.geom.Geometry|Object.<string, *>)=)|
+   *     function(ol.geom.GeometryType,Array.<number>,
+   *         (Array.<number>|Array.<Array.<number>>),Object.<string, *>)}
+   */
+  this.featureClass_ = options.featureClass ?
+      options.featureClass : ol.render.Feature;
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.geometryName_ = options.geometryName ?
+      options.geometryName : 'geometry';
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.layerName_ = options.layerName ? options.layerName : 'layer';
+
+  /**
+   * @private
+   * @type {Array.<string>}
+   */
+  this.layers_ = options.layers ? options.layers : null;
+
+};
+goog.inherits(ol.format.MVT, ol.format.Feature);
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.MVT.prototype.getType = function() {
+  return ol.format.FormatType.ARRAY_BUFFER;
+};
+
+
+/**
+ * @private
+ * @param {Object} rawFeature Raw Mapbox feature.
+ * @param {string} layer Layer.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {ol.Feature} Feature.
+ */
+ol.format.MVT.prototype.readFeature_ = function(
+    rawFeature, layer, opt_options) {
+  var feature = new this.featureClass_();
+  var values = rawFeature.properties;
+  values[this.layerName_] = layer;
+  var geometry = ol.format.Feature.transformWithOptions(
+      ol.format.MVT.readGeometry_(rawFeature), false,
+      this.adaptOptions(opt_options));
+  if (geometry) {
+    goog.asserts.assertInstanceof(geometry, ol.geom.Geometry);
+    values[this.geometryName_] = geometry;
+  }
+  feature.setProperties(values);
+  feature.setGeometryName(this.geometryName_);
+  return feature;
+};
+
+
+/**
+ * @private
+ * @param {Object} rawFeature Raw Mapbox feature.
+ * @param {string} layer Layer.
+ * @return {ol.render.Feature} Feature.
+ */
+ol.format.MVT.prototype.readRenderFeature_ = function(rawFeature, layer) {
+  var coords = rawFeature.loadGeometry();
+  var ends = [];
+  var flatCoordinates = [];
+  ol.format.MVT.calculateFlatCoordinates_(coords, flatCoordinates, ends);
+
+  var type = rawFeature.type;
+  /** @type {ol.geom.GeometryType} */
+  var geometryType;
+  if (type === 1) {
+    geometryType = coords.length === 1 ?
+        ol.geom.GeometryType.POINT : ol.geom.GeometryType.MULTI_POINT;
+  } else if (type === 2) {
+    if (coords.length === 1) {
+      geometryType = ol.geom.GeometryType.LINE_STRING;
+    } else {
+      geometryType = ol.geom.GeometryType.MULTI_LINE_STRING;
+    }
+  } else if (type === 3) {
+    geometryType = ol.geom.GeometryType.POLYGON;
+  }
+
+  var values = rawFeature.properties;
+  values[this.layerName_] = layer;
+
+  return new this.featureClass_(geometryType, flatCoordinates, ends, values);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.MVT.prototype.readFeatures = function(source, opt_options) {
+  goog.asserts.assertInstanceof(source, ArrayBuffer);
+
+  var layers = this.layers_;
+
+  var pbf = new ol.ext.pbf(source);
+  var tile = new ol.ext.vectortile.VectorTile(pbf);
+  var features = [];
+  var featureClass = this.featureClass_;
+  var layer, feature;
+  for (var name in tile.layers) {
+    if (layers && layers.indexOf(name) == -1) {
+      continue;
+    }
+    layer = tile.layers[name];
+
+    for (var i = 0, ii = layer.length; i < ii; ++i) {
+      if (featureClass === ol.render.Feature) {
+        feature = this.readRenderFeature_(layer.feature(i), name);
+      } else {
+        feature = this.readFeature_(layer.feature(i), name, opt_options);
+      }
+      features.push(feature);
+    }
+  }
+
+  return features;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.MVT.prototype.readProjection = function(source) {
+  return this.defaultDataProjection;
+};
+
+
+/**
+ * Sets the layers that features will be read from.
+ * @param {Array.<string>} layers Layers.
+ * @api
+ */
+ol.format.MVT.prototype.setLayers = function(layers) {
+  this.layers_ = layers;
+};
+
+
+/**
+ * @private
+ * @param {Object} coords Raw feature coordinates.
+ * @param {Array.<number>} flatCoordinates Flat coordinates to be populated by
+ *     this function.
+ * @param {Array.<number>} ends Ends to be populated by this function.
+ */
+ol.format.MVT.calculateFlatCoordinates_ = function(
+    coords, flatCoordinates, ends) {
+  var end = 0;
+  var line, coord;
+  for (var i = 0, ii = coords.length; i < ii; ++i) {
+    line = coords[i];
+    for (var j = 0, jj = line.length; j < jj; ++j) {
+      coord = line[j];
+      // Non-tilespace coords can be calculated here when a TileGrid and
+      // TileCoord are known.
+      flatCoordinates.push(coord.x, coord.y);
+    }
+    end += 2 * j;
+    ends.push(end);
+  }
+};
+
+
+/**
+ * @private
+ * @param {Object} rawFeature Raw Mapbox feature.
+ * @return {ol.geom.Geometry} Geometry.
+ */
+ol.format.MVT.readGeometry_ = function(rawFeature) {
+  var type = rawFeature.type;
+  if (type === 0) {
+    return null;
+  }
+
+  var coords = rawFeature.loadGeometry();
+  var ends = [];
+  var flatCoordinates = [];
+  ol.format.MVT.calculateFlatCoordinates_(coords, flatCoordinates, ends);
+
+  var geom;
+  if (type === 1) {
+    geom = coords.length === 1 ?
+        new ol.geom.Point(null) : new ol.geom.MultiPoint(null);
+  } else if (type === 2) {
+    if (coords.length === 1) {
+      geom = new ol.geom.LineString(null);
+    } else {
+      geom = new ol.geom.MultiLineString(null);
+    }
+  } else if (type === 3) {
+    geom = new ol.geom.Polygon(null);
+  }
+
+  geom.setFlatCoordinates(ol.geom.GeometryLayout.XY, flatCoordinates,
+      ends);
+
+  return geom;
+};
+
+// FIXME add typedef for stack state objects
+goog.provide('ol.format.OSMXML');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.dom.NodeType');
+goog.require('goog.object');
+goog.require('ol.Feature');
+goog.require('ol.format.Feature');
+goog.require('ol.format.XMLFeature');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.Point');
+goog.require('ol.geom.Polygon');
+goog.require('ol.proj');
+goog.require('ol.xml');
+
+
+
+/**
+ * @classdesc
+ * Feature format for reading data in the
+ * [OSMXML format](http://wiki.openstreetmap.org/wiki/OSM_XML).
+ *
+ * @constructor
+ * @extends {ol.format.XMLFeature}
+ * @api stable
+ */
+ol.format.OSMXML = function() {
+  goog.base(this);
+
+  /**
+   * @inheritDoc
+   */
+  this.defaultDataProjection = ol.proj.get('EPSG:4326');
+};
+goog.inherits(ol.format.OSMXML, ol.format.XMLFeature);
+
+
+/**
+ * @const
+ * @type {Array.<string>}
+ * @private
+ */
+ol.format.OSMXML.EXTENSIONS_ = ['.osm'];
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.OSMXML.prototype.getExtensions = function() {
+  return ol.format.OSMXML.EXTENSIONS_;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.OSMXML.readNode_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'node', 'localName should be node');
+  var options = /** @type {olx.format.ReadOptions} */ (objectStack[0]);
+  var state = /** @type {Object} */ (objectStack[objectStack.length - 1]);
+  var id = node.getAttribute('id');
+  var coordinates = /** @type {Array.<number>} */ ([
+    parseFloat(node.getAttribute('lon')),
+    parseFloat(node.getAttribute('lat'))
+  ]);
+  state.nodes[id] = coordinates;
+
+  var values = ol.xml.pushParseAndPop({
+    tags: {}
+  }, ol.format.OSMXML.NODE_PARSERS_, node, objectStack);
+  if (!goog.object.isEmpty(values.tags)) {
+    var geometry = new ol.geom.Point(coordinates);
+    ol.format.Feature.transformWithOptions(geometry, false, options);
+    var feature = new ol.Feature(geometry);
+    feature.setId(id);
+    feature.setProperties(values.tags);
+    state.features.push(feature);
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.OSMXML.readWay_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'way', 'localName should be way');
+  var options = /** @type {olx.format.ReadOptions} */ (objectStack[0]);
+  var id = node.getAttribute('id');
+  var values = ol.xml.pushParseAndPop({
+    ndrefs: [],
+    tags: {}
+  }, ol.format.OSMXML.WAY_PARSERS_, node, objectStack);
+  var state = /** @type {Object} */ (objectStack[objectStack.length - 1]);
+  var flatCoordinates = /** @type {Array.<number>} */ ([]);
+  for (var i = 0, ii = values.ndrefs.length; i < ii; i++) {
+    var point = state.nodes[values.ndrefs[i]];
+    goog.array.extend(flatCoordinates, point);
+  }
+  var geometry;
+  if (values.ndrefs[0] == values.ndrefs[values.ndrefs.length - 1]) {
+    // closed way
+    geometry = new ol.geom.Polygon(null);
+    geometry.setFlatCoordinates(ol.geom.GeometryLayout.XY, flatCoordinates,
+        [flatCoordinates.length]);
+  } else {
+    geometry = new ol.geom.LineString(null);
+    geometry.setFlatCoordinates(ol.geom.GeometryLayout.XY, flatCoordinates);
+  }
+  ol.format.Feature.transformWithOptions(geometry, false, options);
+  var feature = new ol.Feature(geometry);
+  feature.setId(id);
+  feature.setProperties(values.tags);
+  state.features.push(feature);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.Feature|undefined} Track.
+ */
+ol.format.OSMXML.readNd_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'nd', 'localName should be nd');
+  var values = /** @type {Object} */ (objectStack[objectStack.length - 1]);
+  values.ndrefs.push(node.getAttribute('ref'));
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {ol.Feature|undefined} Track.
+ */
+ol.format.OSMXML.readTag_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'tag', 'localName should be tag');
+  var values = /** @type {Object} */ (objectStack[objectStack.length - 1]);
+  values.tags[node.getAttribute('k')] = node.getAttribute('v');
+};
+
+
+/**
+ * @const
+ * @private
+ * @type {Array.<string>}
+ */
+ol.format.OSMXML.NAMESPACE_URIS_ = [
+  null
+];
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.OSMXML.WAY_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.OSMXML.NAMESPACE_URIS_, {
+      'nd': ol.format.OSMXML.readNd_,
+      'tag': ol.format.OSMXML.readTag_
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.OSMXML.PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.OSMXML.NAMESPACE_URIS_, {
+      'node': ol.format.OSMXML.readNode_,
+      'way': ol.format.OSMXML.readWay_
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.OSMXML.NODE_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.OSMXML.NAMESPACE_URIS_, {
+      'tag': ol.format.OSMXML.readTag_
+    });
+
+
+/**
+ * Read all features from an OSM source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {Array.<ol.Feature>} Features.
+ * @api stable
+ */
+ol.format.OSMXML.prototype.readFeatures;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.OSMXML.prototype.readFeaturesFromNode = function(node, opt_options) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  var options = this.getReadOptions(node, opt_options);
+  if (node.localName == 'osm') {
+    var state = ol.xml.pushParseAndPop({
+      nodes: {},
+      features: []
+    }, ol.format.OSMXML.PARSERS_, node, [options]);
+    if (state.features) {
+      return state.features;
+    }
+  }
+  return [];
+};
+
+
+/**
+ * Read the projection from an OSM source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @return {ol.proj.Projection} Projection.
+ * @api stable
+ */
+ol.format.OSMXML.prototype.readProjection;
+
+goog.provide('ol.format.XLink');
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.format.XLink.NAMESPACE_URI = 'http://www.w3.org/1999/xlink';
+
+
+/**
+ * @param {Node} node Node.
+ * @return {boolean|undefined} Boolean.
+ */
+ol.format.XLink.readHref = function(node) {
+  return node.getAttributeNS(ol.format.XLink.NAMESPACE_URI, 'href');
+};
+
+goog.provide('ol.format.XML');
+
+goog.require('goog.asserts');
+goog.require('ol.xml');
+
+
+
+/**
+ * @classdesc
+ * Generic format for reading non-feature XML data
+ *
+ * @constructor
+ */
+ol.format.XML = function() {
+};
+
+
+/**
+ * @param {Document|Node|string} source Source.
+ * @return {Object}
+ */
+ol.format.XML.prototype.read = function(source) {
+  if (ol.xml.isDocument(source)) {
+    return this.readFromDocument(/** @type {Document} */ (source));
+  } else if (ol.xml.isNode(source)) {
+    return this.readFromNode(/** @type {Node} */ (source));
+  } else if (goog.isString(source)) {
+    var doc = ol.xml.parse(source);
+    return this.readFromDocument(doc);
+  } else {
+    goog.asserts.fail();
+    return null;
+  }
+};
+
+
+/**
+ * @param {Document} doc Document.
+ * @return {Object}
+ */
+ol.format.XML.prototype.readFromDocument = goog.abstractMethod;
+
+
+/**
+ * @param {Node} node Node.
+ * @return {Object}
+ */
+ol.format.XML.prototype.readFromNode = goog.abstractMethod;
+
+goog.provide('ol.format.OWS');
+
+goog.require('goog.asserts');
+goog.require('goog.dom.NodeType');
+goog.require('ol.format.XLink');
+goog.require('ol.format.XML');
+goog.require('ol.format.XSD');
+goog.require('ol.xml');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.format.XML}
+ */
+ol.format.OWS = function() {
+  goog.base(this);
+};
+goog.inherits(ol.format.OWS, ol.format.XML);
+
+
+/**
+ * @param {Document} doc Document.
+ * @return {Object} OWS object.
+ */
+ol.format.OWS.prototype.readFromDocument = function(doc) {
+  goog.asserts.assert(doc.nodeType == goog.dom.NodeType.DOCUMENT,
+      'doc.nodeType should be DOCUMENT');
+  for (var n = doc.firstChild; n; n = n.nextSibling) {
+    if (n.nodeType == goog.dom.NodeType.ELEMENT) {
+      return this.readFromNode(n);
+    }
+  }
+  return null;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @return {Object} OWS object.
+ */
+ol.format.OWS.prototype.readFromNode = function(node) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  var owsObject = ol.xml.pushParseAndPop({},
+      ol.format.OWS.PARSERS_, node, []);
+  return owsObject ? owsObject : null;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined}
+ */
+ol.format.OWS.readAddress_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Address',
+      'localName should be Address');
+  return ol.xml.pushParseAndPop({},
+      ol.format.OWS.ADDRESS_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined}
+ */
+ol.format.OWS.readAllowedValues_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'AllowedValues',
+      'localName should be AllowedValues');
+  return ol.xml.pushParseAndPop({},
+      ol.format.OWS.ALLOWED_VALUES_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined}
+ */
+ol.format.OWS.readConstraint_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Constraint',
+      'localName should be Constraint');
+  var name = node.getAttribute('name');
+  if (!name) {
+    return undefined;
+  }
+  return ol.xml.pushParseAndPop({'name': name},
+      ol.format.OWS.CONSTRAINT_PARSERS_, node,
+      objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined}
+ */
+ol.format.OWS.readContactInfo_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'ContactInfo',
+      'localName should be ContactInfo');
+  return ol.xml.pushParseAndPop({},
+      ol.format.OWS.CONTACT_INFO_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined}
+ */
+ol.format.OWS.readDcp_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'DCP', 'localName should be DCP');
+  return ol.xml.pushParseAndPop({},
+      ol.format.OWS.DCP_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined}
+ */
+ol.format.OWS.readGet_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Get', 'localName should be Get');
+  var href = ol.format.XLink.readHref(node);
+  if (!href) {
+    return undefined;
+  }
+  return ol.xml.pushParseAndPop({'href': href},
+      ol.format.OWS.REQUEST_METHOD_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined}
+ */
+ol.format.OWS.readHttp_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'HTTP', 'localName should be HTTP');
+  return ol.xml.pushParseAndPop({}, ol.format.OWS.HTTP_PARSERS_,
+      node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined}
+ */
+ol.format.OWS.readOperation_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Operation',
+      'localName should be Operation');
+  var name = node.getAttribute('name');
+  var value = ol.xml.pushParseAndPop({},
+      ol.format.OWS.OPERATION_PARSERS_, node, objectStack);
+  if (!value) {
+    return undefined;
+  }
+  var object = /** @type {Object} */
+      (objectStack[objectStack.length - 1]);
+  goog.asserts.assert(goog.isObject(object), 'object should be an Object');
+  object[name] = value;
+
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined}
+ */
+ol.format.OWS.readOperationsMetadata_ = function(node,
+    objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'OperationsMetadata',
+      'localName should be OperationsMetadata');
+  return ol.xml.pushParseAndPop({},
+      ol.format.OWS.OPERATIONS_METADATA_PARSERS_, node,
+      objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined}
+ */
+ol.format.OWS.readPhone_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Phone', 'localName should be Phone');
+  return ol.xml.pushParseAndPop({},
+      ol.format.OWS.PHONE_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined}
+ */
+ol.format.OWS.readServiceIdentification_ = function(node,
+    objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'ServiceIdentification',
+      'localName should be ServiceIdentification');
+  return ol.xml.pushParseAndPop(
+      {}, ol.format.OWS.SERVICE_IDENTIFICATION_PARSERS_, node,
+      objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined}
+ */
+ol.format.OWS.readServiceContact_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'ServiceContact',
+      'localName should be ServiceContact');
+  return ol.xml.pushParseAndPop(
+      {}, ol.format.OWS.SERVICE_CONTACT_PARSERS_, node,
+      objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined}
+ */
+ol.format.OWS.readServiceProvider_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'ServiceProvider',
+      'localName should be ServiceProvider');
+  return ol.xml.pushParseAndPop(
+      {}, ol.format.OWS.SERVICE_PROVIDER_PARSERS_, node,
+      objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {string|undefined}
+ */
+ol.format.OWS.readValue_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Value', 'localName should be Value');
+  return ol.format.XSD.readString(node);
+};
+
+
+/**
+ * @const
+ * @type {Array.<string>}
+ * @private
+ */
+ol.format.OWS.NAMESPACE_URIS_ = [
+  null,
+  'http://www.opengis.net/ows/1.1'
+];
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.OWS.PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.OWS.NAMESPACE_URIS_, {
+      'ServiceIdentification': ol.xml.makeObjectPropertySetter(
+          ol.format.OWS.readServiceIdentification_),
+      'ServiceProvider': ol.xml.makeObjectPropertySetter(
+          ol.format.OWS.readServiceProvider_),
+      'OperationsMetadata': ol.xml.makeObjectPropertySetter(
+          ol.format.OWS.readOperationsMetadata_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.OWS.ADDRESS_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.OWS.NAMESPACE_URIS_, {
+      'DeliveryPoint': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString),
+      'City': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'AdministrativeArea': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString),
+      'PostalCode': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'Country': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'ElectronicMailAddress': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.OWS.ALLOWED_VALUES_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.OWS.NAMESPACE_URIS_, {
+      'Value': ol.xml.makeObjectPropertyPusher(ol.format.OWS.readValue_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.OWS.CONSTRAINT_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.OWS.NAMESPACE_URIS_, {
+      'AllowedValues': ol.xml.makeObjectPropertySetter(
+          ol.format.OWS.readAllowedValues_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.OWS.CONTACT_INFO_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.OWS.NAMESPACE_URIS_, {
+      'Phone': ol.xml.makeObjectPropertySetter(ol.format.OWS.readPhone_),
+      'Address': ol.xml.makeObjectPropertySetter(ol.format.OWS.readAddress_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.OWS.DCP_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.OWS.NAMESPACE_URIS_, {
+      'HTTP': ol.xml.makeObjectPropertySetter(ol.format.OWS.readHttp_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.OWS.HTTP_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.OWS.NAMESPACE_URIS_, {
+      'Get': ol.xml.makeObjectPropertyPusher(ol.format.OWS.readGet_),
+      'Post': undefined // TODO
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.OWS.OPERATION_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.OWS.NAMESPACE_URIS_, {
+      'DCP': ol.xml.makeObjectPropertySetter(ol.format.OWS.readDcp_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.OWS.OPERATIONS_METADATA_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.OWS.NAMESPACE_URIS_, {
+      'Operation': ol.format.OWS.readOperation_
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.OWS.PHONE_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.OWS.NAMESPACE_URIS_, {
+      'Voice': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'Facsimile': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.OWS.REQUEST_METHOD_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.OWS.NAMESPACE_URIS_, {
+      'Constraint': ol.xml.makeObjectPropertyPusher(
+          ol.format.OWS.readConstraint_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.OWS.SERVICE_CONTACT_PARSERS_ =
+    ol.xml.makeStructureNS(
+    ol.format.OWS.NAMESPACE_URIS_, {
+      'IndividualName': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString),
+      'PositionName': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'ContactInfo': ol.xml.makeObjectPropertySetter(
+          ol.format.OWS.readContactInfo_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.OWS.SERVICE_IDENTIFICATION_PARSERS_ =
+    ol.xml.makeStructureNS(
+    ol.format.OWS.NAMESPACE_URIS_, {
+      'Title': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'ServiceTypeVersion': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString),
+      'ServiceType': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.OWS.SERVICE_PROVIDER_PARSERS_ =
+    ol.xml.makeStructureNS(
+    ol.format.OWS.NAMESPACE_URIS_, {
+      'ProviderName': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'ProviderSite': ol.xml.makeObjectPropertySetter(ol.format.XLink.readHref),
+      'ServiceContact': ol.xml.makeObjectPropertySetter(
+          ol.format.OWS.readServiceContact_)
+    });
+
+goog.provide('ol.geom.flat.flip');
+
+goog.require('goog.asserts');
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {Array.<number>=} opt_dest Destination.
+ * @param {number=} opt_destOffset Destination offset.
+ * @return {Array.<number>} Flat coordinates.
+ */
+ol.geom.flat.flip.flipXY =
+    function(flatCoordinates, offset, end, stride, opt_dest, opt_destOffset) {
+  var dest, destOffset;
+  if (opt_dest !== undefined) {
+    dest = opt_dest;
+    destOffset = opt_destOffset !== undefined ? opt_destOffset : 0;
+  } else {
+    goog.asserts.assert(opt_destOffset === undefined,
+        'opt_destOffSet should be defined');
+    dest = [];
+    destOffset = 0;
+  }
+  var j, k;
+  for (j = offset; j < end; ) {
+    var x = flatCoordinates[j++];
+    dest[destOffset++] = flatCoordinates[j++];
+    dest[destOffset++] = x;
+    for (k = 2; k < stride; ++k) {
+      dest[destOffset++] = flatCoordinates[j++];
+    }
+  }
+  dest.length = destOffset;
+  return dest;
+};
+
+goog.provide('ol.format.Polyline');
+
+goog.require('goog.asserts');
+goog.require('ol.Feature');
+goog.require('ol.format.Feature');
+goog.require('ol.format.TextFeature');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.SimpleGeometry');
+goog.require('ol.geom.flat.flip');
+goog.require('ol.geom.flat.inflate');
+goog.require('ol.proj');
+
+
+
+/**
+ * @classdesc
+ * Feature format for reading and writing data in the Encoded
+ * Polyline Algorithm Format.
+ *
+ * @constructor
+ * @extends {ol.format.TextFeature}
+ * @param {olx.format.PolylineOptions=} opt_options
+ *     Optional configuration object.
+ * @api stable
+ */
+ol.format.Polyline = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  goog.base(this);
+
+  /**
+   * @inheritDoc
+   */
+  this.defaultDataProjection = ol.proj.get('EPSG:4326');
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.factor_ = options.factor ? options.factor : 1e5;
+
+  /**
+   * @private
+   * @type {ol.geom.GeometryLayout}
+   */
+  this.geometryLayout_ = options.geometryLayout ?
+      options.geometryLayout : ol.geom.GeometryLayout.XY;
+};
+goog.inherits(ol.format.Polyline, ol.format.TextFeature);
+
+
+/**
+ * Encode a list of n-dimensional points and return an encoded string
+ *
+ * Attention: This function will modify the passed array!
+ *
+ * @param {Array.<number>} numbers A list of n-dimensional points.
+ * @param {number} stride The number of dimension of the points in the list.
+ * @param {number=} opt_factor The factor by which the numbers will be
+ *     multiplied. The remaining decimal places will get rounded away.
+ *     Default is `1e5`.
+ * @return {string} The encoded string.
+ * @api
+ */
+ol.format.Polyline.encodeDeltas = function(numbers, stride, opt_factor) {
+  var factor = opt_factor ? opt_factor : 1e5;
+  var d;
+
+  var lastNumbers = new Array(stride);
+  for (d = 0; d < stride; ++d) {
+    lastNumbers[d] = 0;
+  }
+
+  var i, ii;
+  for (i = 0, ii = numbers.length; i < ii;) {
+    for (d = 0; d < stride; ++d, ++i) {
+      var num = numbers[i];
+      var delta = num - lastNumbers[d];
+      lastNumbers[d] = num;
+
+      numbers[i] = delta;
+    }
+  }
+
+  return ol.format.Polyline.encodeFloats(numbers, factor);
+};
+
+
+/**
+ * Decode a list of n-dimensional points from an encoded string
+ *
+ * @param {string} encoded An encoded string.
+ * @param {number} stride The number of dimension of the points in the
+ *     encoded string.
+ * @param {number=} opt_factor The factor by which the resulting numbers will
+ *     be divided. Default is `1e5`.
+ * @return {Array.<number>} A list of n-dimensional points.
+ * @api
+ */
+ol.format.Polyline.decodeDeltas = function(encoded, stride, opt_factor) {
+  var factor = opt_factor ? opt_factor : 1e5;
+  var d;
+
+  /** @type {Array.<number>} */
+  var lastNumbers = new Array(stride);
+  for (d = 0; d < stride; ++d) {
+    lastNumbers[d] = 0;
+  }
+
+  var numbers = ol.format.Polyline.decodeFloats(encoded, factor);
+
+  var i, ii;
+  for (i = 0, ii = numbers.length; i < ii;) {
+    for (d = 0; d < stride; ++d, ++i) {
+      lastNumbers[d] += numbers[i];
+
+      numbers[i] = lastNumbers[d];
+    }
+  }
+
+  return numbers;
+};
+
+
+/**
+ * Encode a list of floating point numbers and return an encoded string
+ *
+ * Attention: This function will modify the passed array!
+ *
+ * @param {Array.<number>} numbers A list of floating point numbers.
+ * @param {number=} opt_factor The factor by which the numbers will be
+ *     multiplied. The remaining decimal places will get rounded away.
+ *     Default is `1e5`.
+ * @return {string} The encoded string.
+ * @api
+ */
+ol.format.Polyline.encodeFloats = function(numbers, opt_factor) {
+  var factor = opt_factor ? opt_factor : 1e5;
+  var i, ii;
+  for (i = 0, ii = numbers.length; i < ii; ++i) {
+    numbers[i] = Math.round(numbers[i] * factor);
+  }
+
+  return ol.format.Polyline.encodeSignedIntegers(numbers);
+};
+
+
+/**
+ * Decode a list of floating point numbers from an encoded string
+ *
+ * @param {string} encoded An encoded string.
+ * @param {number=} opt_factor The factor by which the result will be divided.
+ *     Default is `1e5`.
+ * @return {Array.<number>} A list of floating point numbers.
+ * @api
+ */
+ol.format.Polyline.decodeFloats = function(encoded, opt_factor) {
+  var factor = opt_factor ? opt_factor : 1e5;
+  var numbers = ol.format.Polyline.decodeSignedIntegers(encoded);
+  var i, ii;
+  for (i = 0, ii = numbers.length; i < ii; ++i) {
+    numbers[i] /= factor;
+  }
+  return numbers;
+};
+
+
+/**
+ * Encode a list of signed integers and return an encoded string
+ *
+ * Attention: This function will modify the passed array!
+ *
+ * @param {Array.<number>} numbers A list of signed integers.
+ * @return {string} The encoded string.
+ */
+ol.format.Polyline.encodeSignedIntegers = function(numbers) {
+  var i, ii;
+  for (i = 0, ii = numbers.length; i < ii; ++i) {
+    var num = numbers[i];
+    numbers[i] = (num < 0) ? ~(num << 1) : (num << 1);
+  }
+  return ol.format.Polyline.encodeUnsignedIntegers(numbers);
+};
+
+
+/**
+ * Decode a list of signed integers from an encoded string
+ *
+ * @param {string} encoded An encoded string.
+ * @return {Array.<number>} A list of signed integers.
+ */
+ol.format.Polyline.decodeSignedIntegers = function(encoded) {
+  var numbers = ol.format.Polyline.decodeUnsignedIntegers(encoded);
+  var i, ii;
+  for (i = 0, ii = numbers.length; i < ii; ++i) {
+    var num = numbers[i];
+    numbers[i] = (num & 1) ? ~(num >> 1) : (num >> 1);
+  }
+  return numbers;
+};
+
+
+/**
+ * Encode a list of unsigned integers and return an encoded string
+ *
+ * @param {Array.<number>} numbers A list of unsigned integers.
+ * @return {string} The encoded string.
+ */
+ol.format.Polyline.encodeUnsignedIntegers = function(numbers) {
+  var encoded = '';
+  var i, ii;
+  for (i = 0, ii = numbers.length; i < ii; ++i) {
+    encoded += ol.format.Polyline.encodeUnsignedInteger(numbers[i]);
+  }
+  return encoded;
+};
+
+
+/**
+ * Decode a list of unsigned integers from an encoded string
+ *
+ * @param {string} encoded An encoded string.
+ * @return {Array.<number>} A list of unsigned integers.
+ */
+ol.format.Polyline.decodeUnsignedIntegers = function(encoded) {
+  var numbers = [];
+  var current = 0;
+  var shift = 0;
+  var i, ii;
+  for (i = 0, ii = encoded.length; i < ii; ++i) {
+    var b = encoded.charCodeAt(i) - 63;
+    current |= (b & 0x1f) << shift;
+    if (b < 0x20) {
+      numbers.push(current);
+      current = 0;
+      shift = 0;
+    } else {
+      shift += 5;
+    }
+  }
+  return numbers;
+};
+
+
+/**
+ * Encode one single unsigned integer and return an encoded string
+ *
+ * @param {number} num Unsigned integer that should be encoded.
+ * @return {string} The encoded string.
+ */
+ol.format.Polyline.encodeUnsignedInteger = function(num) {
+  var value, encoded = '';
+  while (num >= 0x20) {
+    value = (0x20 | (num & 0x1f)) + 63;
+    encoded += String.fromCharCode(value);
+    num >>= 5;
+  }
+  value = num + 63;
+  encoded += String.fromCharCode(value);
+  return encoded;
+};
+
+
+/**
+ * Read the feature from the Polyline source. The coordinates are assumed to be
+ * in two dimensions and in latitude, longitude order.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {ol.Feature} Feature.
+ * @api stable
+ */
+ol.format.Polyline.prototype.readFeature;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.Polyline.prototype.readFeatureFromText = function(text, opt_options) {
+  var geometry = this.readGeometryFromText(text, opt_options);
+  return new ol.Feature(geometry);
+};
+
+
+/**
+ * Read the feature from the source. As Polyline sources contain a single
+ * feature, this will return the feature in an array.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {Array.<ol.Feature>} Features.
+ * @api stable
+ */
+ol.format.Polyline.prototype.readFeatures;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.Polyline.prototype.readFeaturesFromText =
+    function(text, opt_options) {
+  var feature = this.readFeatureFromText(text, opt_options);
+  return [feature];
+};
+
+
+/**
+ * Read the geometry from the source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {ol.geom.Geometry} Geometry.
+ * @api stable
+ */
+ol.format.Polyline.prototype.readGeometry;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.Polyline.prototype.readGeometryFromText =
+    function(text, opt_options) {
+  var stride = ol.geom.SimpleGeometry.getStrideForLayout(this.geometryLayout_);
+  var flatCoordinates = ol.format.Polyline.decodeDeltas(
+      text, stride, this.factor_);
+  ol.geom.flat.flip.flipXY(
+      flatCoordinates, 0, flatCoordinates.length, stride, flatCoordinates);
+  var coordinates = ol.geom.flat.inflate.coordinates(
+      flatCoordinates, 0, flatCoordinates.length, stride);
+
+  return /** @type {ol.geom.Geometry} */ (
+      ol.format.Feature.transformWithOptions(
+          new ol.geom.LineString(coordinates, this.geometryLayout_), false,
+          this.adaptOptions(opt_options)));
+};
+
+
+/**
+ * Read the projection from a Polyline source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @return {ol.proj.Projection} Projection.
+ * @api stable
+ */
+ol.format.Polyline.prototype.readProjection;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.Polyline.prototype.writeFeatureText = function(feature, opt_options) {
+  var geometry = feature.getGeometry();
+  if (geometry) {
+    return this.writeGeometryText(geometry, opt_options);
+  } else {
+    goog.asserts.fail('geometry needs to be defined');
+    return '';
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.Polyline.prototype.writeFeaturesText =
+    function(features, opt_options) {
+  goog.asserts.assert(features.length == 1,
+      'features array should have 1 item');
+  return this.writeFeatureText(features[0], opt_options);
+};
+
+
+/**
+ * Write a single geometry in Polyline format.
+ *
+ * @function
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {string} Geometry.
+ * @api stable
+ */
+ol.format.Polyline.prototype.writeGeometry;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.Polyline.prototype.writeGeometryText =
+    function(geometry, opt_options) {
+  goog.asserts.assertInstanceof(geometry, ol.geom.LineString,
+      'geometry should be an ol.geom.LineString');
+  geometry = /** @type {ol.geom.LineString} */
+      (ol.format.Feature.transformWithOptions(
+          geometry, true, this.adaptOptions(opt_options)));
+  var flatCoordinates = geometry.getFlatCoordinates();
+  var stride = geometry.getStride();
+  ol.geom.flat.flip.flipXY(
+      flatCoordinates, 0, flatCoordinates.length, stride, flatCoordinates);
+  return ol.format.Polyline.encodeDeltas(flatCoordinates, stride, this.factor_);
+};
+
+goog.provide('ol.format.TopoJSON');
+
+goog.require('goog.asserts');
+goog.require('goog.object');
+goog.require('ol.Feature');
+goog.require('ol.format.Feature');
+goog.require('ol.format.JSONFeature');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.MultiLineString');
+goog.require('ol.geom.MultiPoint');
+goog.require('ol.geom.MultiPolygon');
+goog.require('ol.geom.Point');
+goog.require('ol.geom.Polygon');
+goog.require('ol.proj');
+
+
+
+/**
+ * @classdesc
+ * Feature format for reading data in the TopoJSON format.
+ *
+ * @constructor
+ * @extends {ol.format.JSONFeature}
+ * @param {olx.format.TopoJSONOptions=} opt_options Options.
+ * @api stable
+ */
+ol.format.TopoJSON = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  goog.base(this);
+
+  /**
+   * @inheritDoc
+   */
+  this.defaultDataProjection = ol.proj.get(
+      options.defaultDataProjection ?
+          options.defaultDataProjection : 'EPSG:4326');
+
+};
+goog.inherits(ol.format.TopoJSON, ol.format.JSONFeature);
+
+
+/**
+ * @const {Array.<string>}
+ * @private
+ */
+ol.format.TopoJSON.EXTENSIONS_ = ['.topojson'];
+
+
+/**
+ * Concatenate arcs into a coordinate array.
+ * @param {Array.<number>} indices Indices of arcs to concatenate.  Negative
+ *     values indicate arcs need to be reversed.
+ * @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs (already
+ *     transformed).
+ * @return {Array.<ol.Coordinate>} Coordinates array.
+ * @private
+ */
+ol.format.TopoJSON.concatenateArcs_ = function(indices, arcs) {
+  /** @type {Array.<ol.Coordinate>} */
+  var coordinates = [];
+  var index, arc;
+  var i, ii;
+  var j, jj;
+  for (i = 0, ii = indices.length; i < ii; ++i) {
+    index = indices[i];
+    if (i > 0) {
+      // splicing together arcs, discard last point
+      coordinates.pop();
+    }
+    if (index >= 0) {
+      // forward arc
+      arc = arcs[index];
+    } else {
+      // reverse arc
+      arc = arcs[~index].slice().reverse();
+    }
+    coordinates.push.apply(coordinates, arc);
+  }
+  // provide fresh copies of coordinate arrays
+  for (j = 0, jj = coordinates.length; j < jj; ++j) {
+    coordinates[j] = coordinates[j].slice();
+  }
+  return coordinates;
+};
+
+
+/**
+ * Create a point from a TopoJSON geometry object.
+ *
+ * @param {TopoJSONGeometry} object TopoJSON object.
+ * @param {Array.<number>} scale Scale for each dimension.
+ * @param {Array.<number>} translate Translation for each dimension.
+ * @return {ol.geom.Point} Geometry.
+ * @private
+ */
+ol.format.TopoJSON.readPointGeometry_ = function(object, scale, translate) {
+  var coordinates = object.coordinates;
+  if (scale && translate) {
+    ol.format.TopoJSON.transformVertex_(coordinates, scale, translate);
+  }
+  return new ol.geom.Point(coordinates);
+};
+
+
+/**
+ * Create a multi-point from a TopoJSON geometry object.
+ *
+ * @param {TopoJSONGeometry} object TopoJSON object.
+ * @param {Array.<number>} scale Scale for each dimension.
+ * @param {Array.<number>} translate Translation for each dimension.
+ * @return {ol.geom.MultiPoint} Geometry.
+ * @private
+ */
+ol.format.TopoJSON.readMultiPointGeometry_ = function(object, scale,
+    translate) {
+  var coordinates = object.coordinates;
+  var i, ii;
+  if (scale && translate) {
+    for (i = 0, ii = coordinates.length; i < ii; ++i) {
+      ol.format.TopoJSON.transformVertex_(coordinates[i], scale, translate);
+    }
+  }
+  return new ol.geom.MultiPoint(coordinates);
+};
+
+
+/**
+ * Create a linestring from a TopoJSON geometry object.
+ *
+ * @param {TopoJSONGeometry} object TopoJSON object.
+ * @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
+ * @return {ol.geom.LineString} Geometry.
+ * @private
+ */
+ol.format.TopoJSON.readLineStringGeometry_ = function(object, arcs) {
+  var coordinates = ol.format.TopoJSON.concatenateArcs_(object.arcs, arcs);
+  return new ol.geom.LineString(coordinates);
+};
+
+
+/**
+ * Create a multi-linestring from a TopoJSON geometry object.
+ *
+ * @param {TopoJSONGeometry} object TopoJSON object.
+ * @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
+ * @return {ol.geom.MultiLineString} Geometry.
+ * @private
+ */
+ol.format.TopoJSON.readMultiLineStringGeometry_ = function(object, arcs) {
+  var coordinates = [];
+  var i, ii;
+  for (i = 0, ii = object.arcs.length; i < ii; ++i) {
+    coordinates[i] = ol.format.TopoJSON.concatenateArcs_(object.arcs[i], arcs);
+  }
+  return new ol.geom.MultiLineString(coordinates);
+};
+
+
+/**
+ * Create a polygon from a TopoJSON geometry object.
+ *
+ * @param {TopoJSONGeometry} object TopoJSON object.
+ * @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
+ * @return {ol.geom.Polygon} Geometry.
+ * @private
+ */
+ol.format.TopoJSON.readPolygonGeometry_ = function(object, arcs) {
+  var coordinates = [];
+  var i, ii;
+  for (i = 0, ii = object.arcs.length; i < ii; ++i) {
+    coordinates[i] = ol.format.TopoJSON.concatenateArcs_(object.arcs[i], arcs);
+  }
+  return new ol.geom.Polygon(coordinates);
+};
+
+
+/**
+ * Create a multi-polygon from a TopoJSON geometry object.
+ *
+ * @param {TopoJSONGeometry} object TopoJSON object.
+ * @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
+ * @return {ol.geom.MultiPolygon} Geometry.
+ * @private
+ */
+ol.format.TopoJSON.readMultiPolygonGeometry_ = function(object, arcs) {
+  var coordinates = [];
+  var polyArray, ringCoords, j, jj;
+  var i, ii;
+  for (i = 0, ii = object.arcs.length; i < ii; ++i) {
+    // for each polygon
+    polyArray = object.arcs[i];
+    ringCoords = [];
+    for (j = 0, jj = polyArray.length; j < jj; ++j) {
+      // for each ring
+      ringCoords[j] = ol.format.TopoJSON.concatenateArcs_(polyArray[j], arcs);
+    }
+    coordinates[i] = ringCoords;
+  }
+  return new ol.geom.MultiPolygon(coordinates);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.TopoJSON.prototype.getExtensions = function() {
+  return ol.format.TopoJSON.EXTENSIONS_;
+};
+
+
+/**
+ * Create features from a TopoJSON GeometryCollection object.
+ *
+ * @param {TopoJSONGeometryCollection} collection TopoJSON Geometry
+ *     object.
+ * @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
+ * @param {Array.<number>} scale Scale for each dimension.
+ * @param {Array.<number>} translate Translation for each dimension.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {Array.<ol.Feature>} Array of features.
+ * @private
+ */
+ol.format.TopoJSON.readFeaturesFromGeometryCollection_ = function(
+    collection, arcs, scale, translate, opt_options) {
+  var geometries = collection.geometries;
+  var features = [];
+  var i, ii;
+  for (i = 0, ii = geometries.length; i < ii; ++i) {
+    features[i] = ol.format.TopoJSON.readFeatureFromGeometry_(
+        geometries[i], arcs, scale, translate, opt_options);
+  }
+  return features;
+};
+
+
+/**
+ * Create a feature from a TopoJSON geometry object.
+ *
+ * @param {TopoJSONGeometry} object TopoJSON geometry object.
+ * @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
+ * @param {Array.<number>} scale Scale for each dimension.
+ * @param {Array.<number>} translate Translation for each dimension.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {ol.Feature} Feature.
+ * @private
+ */
+ol.format.TopoJSON.readFeatureFromGeometry_ = function(object, arcs,
+    scale, translate, opt_options) {
+  var geometry;
+  var type = object.type;
+  var geometryReader = ol.format.TopoJSON.GEOMETRY_READERS_[type];
+  goog.asserts.assert(geometryReader, 'geometryReader should be defined');
+  if ((type === 'Point') || (type === 'MultiPoint')) {
+    geometry = geometryReader(object, scale, translate);
+  } else {
+    geometry = geometryReader(object, arcs);
+  }
+  var feature = new ol.Feature();
+  feature.setGeometry(/** @type {ol.geom.Geometry} */ (
+      ol.format.Feature.transformWithOptions(geometry, false, opt_options)));
+  if (object.id !== undefined) {
+    feature.setId(object.id);
+  }
+  if (object.properties) {
+    feature.setProperties(object.properties);
+  }
+  return feature;
+};
+
+
+/**
+ * Read all features from a TopoJSON source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @return {Array.<ol.Feature>} Features.
+ * @api stable
+ */
+ol.format.TopoJSON.prototype.readFeatures;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.TopoJSON.prototype.readFeaturesFromObject = function(
+    object, opt_options) {
+  if (object.type == 'Topology') {
+    var topoJSONTopology = /** @type {TopoJSONTopology} */ (object);
+    var transform, scale = null, translate = null;
+    if (topoJSONTopology.transform) {
+      transform = topoJSONTopology.transform;
+      scale = transform.scale;
+      translate = transform.translate;
+    }
+    var arcs = topoJSONTopology.arcs;
+    if (transform) {
+      ol.format.TopoJSON.transformArcs_(arcs, scale, translate);
+    }
+    /** @type {Array.<ol.Feature>} */
+    var features = [];
+    var topoJSONFeatures = goog.object.getValues(topoJSONTopology.objects);
+    var i, ii;
+    var feature;
+    for (i = 0, ii = topoJSONFeatures.length; i < ii; ++i) {
+      if (topoJSONFeatures[i].type === 'GeometryCollection') {
+        feature = /** @type {TopoJSONGeometryCollection} */
+            (topoJSONFeatures[i]);
+        features.push.apply(features,
+            ol.format.TopoJSON.readFeaturesFromGeometryCollection_(
+                feature, arcs, scale, translate, opt_options));
+      } else {
+        feature = /** @type {TopoJSONGeometry} */
+            (topoJSONFeatures[i]);
+        features.push(ol.format.TopoJSON.readFeatureFromGeometry_(
+            feature, arcs, scale, translate, opt_options));
+      }
+    }
+    return features;
+  } else {
+    return [];
+  }
+};
+
+
+/**
+ * Apply a linear transform to array of arcs.  The provided array of arcs is
+ * modified in place.
+ *
+ * @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
+ * @param {Array.<number>} scale Scale for each dimension.
+ * @param {Array.<number>} translate Translation for each dimension.
+ * @private
+ */
+ol.format.TopoJSON.transformArcs_ = function(arcs, scale, translate) {
+  var i, ii;
+  for (i = 0, ii = arcs.length; i < ii; ++i) {
+    ol.format.TopoJSON.transformArc_(arcs[i], scale, translate);
+  }
+};
+
+
+/**
+ * Apply a linear transform to an arc.  The provided arc is modified in place.
+ *
+ * @param {Array.<ol.Coordinate>} arc Arc.
+ * @param {Array.<number>} scale Scale for each dimension.
+ * @param {Array.<number>} translate Translation for each dimension.
+ * @private
+ */
+ol.format.TopoJSON.transformArc_ = function(arc, scale, translate) {
+  var x = 0;
+  var y = 0;
+  var vertex;
+  var i, ii;
+  for (i = 0, ii = arc.length; i < ii; ++i) {
+    vertex = arc[i];
+    x += vertex[0];
+    y += vertex[1];
+    vertex[0] = x;
+    vertex[1] = y;
+    ol.format.TopoJSON.transformVertex_(vertex, scale, translate);
+  }
+};
+
+
+/**
+ * Apply a linear transform to a vertex.  The provided vertex is modified in
+ * place.
+ *
+ * @param {ol.Coordinate} vertex Vertex.
+ * @param {Array.<number>} scale Scale for each dimension.
+ * @param {Array.<number>} translate Translation for each dimension.
+ * @private
+ */
+ol.format.TopoJSON.transformVertex_ = function(vertex, scale, translate) {
+  vertex[0] = vertex[0] * scale[0] + translate[0];
+  vertex[1] = vertex[1] * scale[1] + translate[1];
+};
+
+
+/**
+ * Read the projection from a TopoJSON source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} object Source.
+ * @return {ol.proj.Projection} Projection.
+ * @api stable
+ */
+ol.format.TopoJSON.prototype.readProjection = function(object) {
+  return this.defaultDataProjection;
+};
+
+
+/**
+ * @const
+ * @private
+ * @type {Object.<string, function(TopoJSONGeometry, Array, ...Array): ol.geom.Geometry>}
+ */
+ol.format.TopoJSON.GEOMETRY_READERS_ = {
+  'Point': ol.format.TopoJSON.readPointGeometry_,
+  'LineString': ol.format.TopoJSON.readLineStringGeometry_,
+  'Polygon': ol.format.TopoJSON.readPolygonGeometry_,
+  'MultiPoint': ol.format.TopoJSON.readMultiPointGeometry_,
+  'MultiLineString': ol.format.TopoJSON.readMultiLineStringGeometry_,
+  'MultiPolygon': ol.format.TopoJSON.readMultiPolygonGeometry_
+};
+
+goog.provide('ol.format.WFS');
+
+goog.require('goog.asserts');
+goog.require('goog.dom.NodeType');
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.format.GML3');
+goog.require('ol.format.GMLBase');
+goog.require('ol.format.XMLFeature');
+goog.require('ol.format.XSD');
+goog.require('ol.geom.Geometry');
+goog.require('ol.proj');
+goog.require('ol.xml');
+
+
+
+/**
+ * @classdesc
+ * Feature format for reading and writing data in the WFS format.
+ * By default, supports WFS version 1.1.0. You can pass a GML format
+ * as option if you want to read a WFS that contains GML2 (WFS 1.0.0).
+ * Also see {@link ol.format.GMLBase} which is used by this format.
+ *
+ * @constructor
+ * @param {olx.format.WFSOptions=} opt_options
+ *     Optional configuration object.
+ * @extends {ol.format.XMLFeature}
+ * @api stable
+ */
+ol.format.WFS = function(opt_options) {
+  var options = opt_options ? opt_options : {};
+
+  /**
+   * @private
+   * @type {Array.<string>|string|undefined}
+   */
+  this.featureType_ = options.featureType;
+
+  /**
+   * @private
+   * @type {Object.<string, string>|string|undefined}
+   */
+  this.featureNS_ = options.featureNS;
+
+  /**
+   * @private
+   * @type {ol.format.GMLBase}
+   */
+  this.gmlFormat_ = options.gmlFormat ?
+      options.gmlFormat : new ol.format.GML3();
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.schemaLocation_ = options.schemaLocation ?
+      options.schemaLocation : ol.format.WFS.SCHEMA_LOCATION;
+
+  goog.base(this);
+};
+goog.inherits(ol.format.WFS, ol.format.XMLFeature);
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.format.WFS.FEATURE_PREFIX = 'feature';
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.format.WFS.XMLNS = 'http://www.w3.org/2000/xmlns/';
+
+
+/**
+ * Number of features; bounds/extent.
+ * @typedef {{numberOfFeatures: number,
+ *            bounds: ol.Extent}}
+ * @api stable
+ */
+ol.format.WFS.FeatureCollectionMetadata;
+
+
+/**
+ * Total deleted; total inserted; total updated; array of insert ids.
+ * @typedef {{totalDeleted: number,
+ *            totalInserted: number,
+ *            totalUpdated: number,
+ *            insertIds: Array.<string>}}
+ * @api stable
+ */
+ol.format.WFS.TransactionResponse;
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.format.WFS.SCHEMA_LOCATION = 'http://www.opengis.net/wfs ' +
+    'http://schemas.opengis.net/wfs/1.1.0/wfs.xsd';
+
+
+/**
+ * Read all features from a WFS FeatureCollection.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {Array.<ol.Feature>} Features.
+ * @api stable
+ */
+ol.format.WFS.prototype.readFeatures;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.WFS.prototype.readFeaturesFromNode = function(node, opt_options) {
+  var context = {
+    'featureType': this.featureType_,
+    'featureNS': this.featureNS_
+  };
+  goog.object.extend(context, this.getReadOptions(node,
+      opt_options ? opt_options : {}));
+  var objectStack = [context];
+  this.gmlFormat_.FEATURE_COLLECTION_PARSERS[ol.format.GMLBase.GMLNS][
+      'featureMember'] =
+      ol.xml.makeArrayPusher(ol.format.GMLBase.prototype.readFeaturesInternal);
+  var features = ol.xml.pushParseAndPop([],
+      this.gmlFormat_.FEATURE_COLLECTION_PARSERS, node,
+      objectStack, this.gmlFormat_);
+  if (!features) {
+    features = [];
+  }
+  return features;
+};
+
+
+/**
+ * Read transaction response of the source.
+ *
+ * @param {Document|Node|Object|string} source Source.
+ * @return {ol.format.WFS.TransactionResponse|undefined} Transaction response.
+ * @api stable
+ */
+ol.format.WFS.prototype.readTransactionResponse = function(source) {
+  if (ol.xml.isDocument(source)) {
+    return this.readTransactionResponseFromDocument(
+        /** @type {Document} */ (source));
+  } else if (ol.xml.isNode(source)) {
+    return this.readTransactionResponseFromNode(/** @type {Node} */ (source));
+  } else if (goog.isString(source)) {
+    var doc = ol.xml.parse(source);
+    return this.readTransactionResponseFromDocument(doc);
+  } else {
+    goog.asserts.fail('Unknown source type');
+    return undefined;
+  }
+};
+
+
+/**
+ * Read feature collection metadata of the source.
+ *
+ * @param {Document|Node|Object|string} source Source.
+ * @return {ol.format.WFS.FeatureCollectionMetadata|undefined}
+ *     FeatureCollection metadata.
+ * @api stable
+ */
+ol.format.WFS.prototype.readFeatureCollectionMetadata = function(source) {
+  if (ol.xml.isDocument(source)) {
+    return this.readFeatureCollectionMetadataFromDocument(
+        /** @type {Document} */ (source));
+  } else if (ol.xml.isNode(source)) {
+    return this.readFeatureCollectionMetadataFromNode(
+        /** @type {Node} */ (source));
+  } else if (goog.isString(source)) {
+    var doc = ol.xml.parse(source);
+    return this.readFeatureCollectionMetadataFromDocument(doc);
+  } else {
+    goog.asserts.fail('Unknown source type');
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {Document} doc Document.
+ * @return {ol.format.WFS.FeatureCollectionMetadata|undefined}
+ *     FeatureCollection metadata.
+ */
+ol.format.WFS.prototype.readFeatureCollectionMetadataFromDocument =
+    function(doc) {
+  goog.asserts.assert(doc.nodeType == goog.dom.NodeType.DOCUMENT,
+      'doc.nodeType should be DOCUMENT');
+  for (var n = doc.firstChild; n; n = n.nextSibling) {
+    if (n.nodeType == goog.dom.NodeType.ELEMENT) {
+      return this.readFeatureCollectionMetadataFromNode(n);
+    }
+  }
+  return undefined;
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WFS.FEATURE_COLLECTION_PARSERS_ = {
+  'http://www.opengis.net/gml': {
+    'boundedBy': ol.xml.makeObjectPropertySetter(
+        ol.format.GMLBase.prototype.readGeometryElement, 'bounds')
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @return {ol.format.WFS.FeatureCollectionMetadata|undefined}
+ *     FeatureCollection metadata.
+ */
+ol.format.WFS.prototype.readFeatureCollectionMetadataFromNode = function(node) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'FeatureCollection',
+      'localName should be FeatureCollection');
+  var result = {};
+  var value = ol.format.XSD.readNonNegativeIntegerString(
+      node.getAttribute('numberOfFeatures'));
+  result['numberOfFeatures'] = value;
+  return ol.xml.pushParseAndPop(
+      /** @type {ol.format.WFS.FeatureCollectionMetadata} */ (result),
+      ol.format.WFS.FEATURE_COLLECTION_PARSERS_, node, [], this.gmlFormat_);
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WFS.TRANSACTION_SUMMARY_PARSERS_ = {
+  'http://www.opengis.net/wfs': {
+    'totalInserted': ol.xml.makeObjectPropertySetter(
+        ol.format.XSD.readNonNegativeInteger),
+    'totalUpdated': ol.xml.makeObjectPropertySetter(
+        ol.format.XSD.readNonNegativeInteger),
+    'totalDeleted': ol.xml.makeObjectPropertySetter(
+        ol.format.XSD.readNonNegativeInteger)
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Transaction Summary.
+ * @private
+ */
+ol.format.WFS.readTransactionSummary_ = function(node, objectStack) {
+  return ol.xml.pushParseAndPop(
+      {}, ol.format.WFS.TRANSACTION_SUMMARY_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WFS.OGC_FID_PARSERS_ = {
+  'http://www.opengis.net/ogc': {
+    'FeatureId': ol.xml.makeArrayPusher(function(node, objectStack) {
+      return node.getAttribute('fid');
+    })
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ */
+ol.format.WFS.fidParser_ = function(node, objectStack) {
+  ol.xml.parseNode(ol.format.WFS.OGC_FID_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WFS.INSERT_RESULTS_PARSERS_ = {
+  'http://www.opengis.net/wfs': {
+    'Feature': ol.format.WFS.fidParser_
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Array.<string>|undefined} Insert results.
+ * @private
+ */
+ol.format.WFS.readInsertResults_ = function(node, objectStack) {
+  return ol.xml.pushParseAndPop(
+      [], ol.format.WFS.INSERT_RESULTS_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WFS.TRANSACTION_RESPONSE_PARSERS_ = {
+  'http://www.opengis.net/wfs': {
+    'TransactionSummary': ol.xml.makeObjectPropertySetter(
+        ol.format.WFS.readTransactionSummary_, 'transactionSummary'),
+    'InsertResults': ol.xml.makeObjectPropertySetter(
+        ol.format.WFS.readInsertResults_, 'insertIds')
+  }
+};
+
+
+/**
+ * @param {Document} doc Document.
+ * @return {ol.format.WFS.TransactionResponse|undefined} Transaction response.
+ */
+ol.format.WFS.prototype.readTransactionResponseFromDocument = function(doc) {
+  goog.asserts.assert(doc.nodeType == goog.dom.NodeType.DOCUMENT,
+      'doc.nodeType should be DOCUMENT');
+  for (var n = doc.firstChild; n; n = n.nextSibling) {
+    if (n.nodeType == goog.dom.NodeType.ELEMENT) {
+      return this.readTransactionResponseFromNode(n);
+    }
+  }
+  return undefined;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @return {ol.format.WFS.TransactionResponse|undefined} Transaction response.
+ */
+ol.format.WFS.prototype.readTransactionResponseFromNode = function(node) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should  be ELEMENT');
+  goog.asserts.assert(node.localName == 'TransactionResponse',
+      'localName should be TransactionResponse');
+  return ol.xml.pushParseAndPop(
+      /** @type {ol.format.WFS.TransactionResponse} */({}),
+      ol.format.WFS.TRANSACTION_RESPONSE_PARSERS_, node, []);
+};
+
+
+/**
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.WFS.QUERY_SERIALIZERS_ = {
+  'http://www.opengis.net/wfs': {
+    'PropertyName': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode)
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.Feature} feature Feature.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.WFS.writeFeature_ = function(node, feature, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var featureType = context['featureType'];
+  var featureNS = context['featureNS'];
+  var child = ol.xml.createElementNS(featureNS, featureType);
+  node.appendChild(child);
+  ol.format.GML3.prototype.writeFeatureElement(child, feature, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {number|string} fid Feature identifier.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.WFS.writeOgcFidFilter_ = function(node, fid, objectStack) {
+  var filter = ol.xml.createElementNS('http://www.opengis.net/ogc', 'Filter');
+  var child = ol.xml.createElementNS('http://www.opengis.net/ogc', 'FeatureId');
+  filter.appendChild(child);
+  child.setAttribute('fid', fid);
+  node.appendChild(filter);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.Feature} feature Feature.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.WFS.writeDelete_ = function(node, feature, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var featureType = context['featureType'];
+  var featurePrefix = context['featurePrefix'];
+  featurePrefix = featurePrefix ? featurePrefix :
+      ol.format.WFS.FEATURE_PREFIX;
+  var featureNS = context['featureNS'];
+  node.setAttribute('typeName', featurePrefix + ':' + featureType);
+  ol.xml.setAttributeNS(node, ol.format.WFS.XMLNS, 'xmlns:' + featurePrefix,
+      featureNS);
+  var fid = feature.getId();
+  if (fid) {
+    ol.format.WFS.writeOgcFidFilter_(node, fid, objectStack);
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.Feature} feature Feature.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.WFS.writeUpdate_ = function(node, feature, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var featureType = context['featureType'];
+  var featurePrefix = context['featurePrefix'];
+  featurePrefix = featurePrefix ? featurePrefix :
+      ol.format.WFS.FEATURE_PREFIX;
+  var featureNS = context['featureNS'];
+  node.setAttribute('typeName', featurePrefix + ':' + featureType);
+  ol.xml.setAttributeNS(node, ol.format.WFS.XMLNS, 'xmlns:' + featurePrefix,
+      featureNS);
+  var fid = feature.getId();
+  if (fid) {
+    var keys = feature.getKeys();
+    var values = [];
+    for (var i = 0, ii = keys.length; i < ii; i++) {
+      var value = feature.get(keys[i]);
+      if (value !== undefined) {
+        values.push({name: keys[i], value: value});
+      }
+    }
+    ol.xml.pushSerializeAndPop({node: node, srsName:
+          context['srsName']},
+    ol.format.WFS.TRANSACTION_SERIALIZERS_,
+    ol.xml.makeSimpleNodeFactory('Property'), values,
+    objectStack);
+    ol.format.WFS.writeOgcFidFilter_(node, fid, objectStack);
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Object} pair Property name and value.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.WFS.writeProperty_ = function(node, pair, objectStack) {
+  var name = ol.xml.createElementNS('http://www.opengis.net/wfs', 'Name');
+  node.appendChild(name);
+  ol.format.XSD.writeStringTextNode(name, pair.name);
+  if (pair.value !== undefined && pair.value !== null) {
+    var value = ol.xml.createElementNS('http://www.opengis.net/wfs', 'Value');
+    node.appendChild(value);
+    if (pair.value instanceof ol.geom.Geometry) {
+      ol.format.GML3.prototype.writeGeometryElement(value,
+          pair.value, objectStack);
+    } else {
+      ol.format.XSD.writeStringTextNode(value, pair.value);
+    }
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {{vendorId: string, safeToIgnore: boolean, value: string}}
+ *     nativeElement The native element.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.WFS.writeNative_ = function(node, nativeElement, objectStack) {
+  if (nativeElement.vendorId) {
+    node.setAttribute('vendorId', nativeElement.vendorId);
+  }
+  if (nativeElement.safeToIgnore !== undefined) {
+    node.setAttribute('safeToIgnore', nativeElement.safeToIgnore);
+  }
+  if (nativeElement.value !== undefined) {
+    ol.format.XSD.writeStringTextNode(node, nativeElement.value);
+  }
+};
+
+
+/**
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.WFS.TRANSACTION_SERIALIZERS_ = {
+  'http://www.opengis.net/wfs': {
+    'Insert': ol.xml.makeChildAppender(ol.format.WFS.writeFeature_),
+    'Update': ol.xml.makeChildAppender(ol.format.WFS.writeUpdate_),
+    'Delete': ol.xml.makeChildAppender(ol.format.WFS.writeDelete_),
+    'Property': ol.xml.makeChildAppender(ol.format.WFS.writeProperty_),
+    'Native': ol.xml.makeChildAppender(ol.format.WFS.writeNative_)
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {string} featureType Feature type.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.WFS.writeQuery_ = function(node, featureType, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var featurePrefix = context['featurePrefix'];
+  var featureNS = context['featureNS'];
+  var propertyNames = context['propertyNames'];
+  var srsName = context['srsName'];
+  var prefix = featurePrefix ? featurePrefix + ':' : '';
+  node.setAttribute('typeName', prefix + featureType);
+  if (srsName) {
+    node.setAttribute('srsName', srsName);
+  }
+  if (featureNS) {
+    ol.xml.setAttributeNS(node, ol.format.WFS.XMLNS, 'xmlns:' + featurePrefix,
+        featureNS);
+  }
+  var item = goog.object.clone(context);
+  item.node = node;
+  ol.xml.pushSerializeAndPop(item,
+      ol.format.WFS.QUERY_SERIALIZERS_,
+      ol.xml.makeSimpleNodeFactory('PropertyName'), propertyNames,
+      objectStack);
+  var bbox = context['bbox'];
+  if (bbox) {
+    var child = ol.xml.createElementNS('http://www.opengis.net/ogc', 'Filter');
+    ol.format.WFS.writeOgcBBOX_(child, bbox, objectStack);
+    node.appendChild(child);
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {string} value PropertyName value.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.WFS.writeOgcPropertyName_ = function(node, value, objectStack) {
+  var property = ol.xml.createElementNS('http://www.opengis.net/ogc',
+      'PropertyName');
+  ol.format.XSD.writeStringTextNode(property, value);
+  node.appendChild(property);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {ol.Extent} bbox Bounding box.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.WFS.writeOgcBBOX_ = function(node, bbox, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var geometryName = context['geometryName'];
+  var bboxNode = ol.xml.createElementNS('http://www.opengis.net/ogc', 'BBOX');
+  node.appendChild(bboxNode);
+  ol.format.WFS.writeOgcPropertyName_(bboxNode, geometryName, objectStack);
+  ol.format.GML3.prototype.writeGeometryElement(bboxNode, bbox, objectStack);
+};
+
+
+/**
+ * @type {Object.<string, Object.<string, ol.xml.Serializer>>}
+ * @private
+ */
+ol.format.WFS.GETFEATURE_SERIALIZERS_ = {
+  'http://www.opengis.net/wfs': {
+    'Query': ol.xml.makeChildAppender(
+        ol.format.WFS.writeQuery_)
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<{string}>} featureTypes Feature types.
+ * @param {Array.<*>} objectStack Node stack.
+ * @private
+ */
+ol.format.WFS.writeGetFeature_ = function(node, featureTypes, objectStack) {
+  var context = objectStack[objectStack.length - 1];
+  goog.asserts.assert(goog.isObject(context), 'context should be an Object');
+  var item = goog.object.clone(context);
+  item.node = node;
+  ol.xml.pushSerializeAndPop(item,
+      ol.format.WFS.GETFEATURE_SERIALIZERS_,
+      ol.xml.makeSimpleNodeFactory('Query'), featureTypes,
+      objectStack);
+};
+
+
+/**
+ * Encode format as WFS `GetFeature` and return the Node.
+ *
+ * @param {olx.format.WFSWriteGetFeatureOptions} options Options.
+ * @return {Node} Result.
+ * @api stable
+ */
+ol.format.WFS.prototype.writeGetFeature = function(options) {
+  var node = ol.xml.createElementNS('http://www.opengis.net/wfs',
+      'GetFeature');
+  node.setAttribute('service', 'WFS');
+  node.setAttribute('version', '1.1.0');
+  if (options) {
+    if (options.handle) {
+      node.setAttribute('handle', options.handle);
+    }
+    if (options.outputFormat) {
+      node.setAttribute('outputFormat', options.outputFormat);
+    }
+    if (options.maxFeatures !== undefined) {
+      node.setAttribute('maxFeatures', options.maxFeatures);
+    }
+    if (options.resultType) {
+      node.setAttribute('resultType', options.resultType);
+    }
+    if (options.startIndex !== undefined) {
+      node.setAttribute('startIndex', options.startIndex);
+    }
+    if (options.count !== undefined) {
+      node.setAttribute('count', options.count);
+    }
+  }
+  ol.xml.setAttributeNS(node, 'http://www.w3.org/2001/XMLSchema-instance',
+      'xsi:schemaLocation', this.schemaLocation_);
+  var context = {
+    node: node,
+    srsName: options.srsName,
+    featureNS: options.featureNS ? options.featureNS : this.featureNS_,
+    featurePrefix: options.featurePrefix,
+    geometryName: options.geometryName,
+    bbox: options.bbox,
+    propertyNames: options.propertyNames ? options.propertyNames : []
+  };
+  goog.asserts.assert(goog.isArray(options.featureTypes),
+      'options.featureTypes should be an array');
+  ol.format.WFS.writeGetFeature_(node, options.featureTypes, [context]);
+  return node;
+};
+
+
+/**
+ * Encode format as WFS `Transaction` and return the Node.
+ *
+ * @param {Array.<ol.Feature>} inserts The features to insert.
+ * @param {Array.<ol.Feature>} updates The features to update.
+ * @param {Array.<ol.Feature>} deletes The features to delete.
+ * @param {olx.format.WFSWriteTransactionOptions} options Write options.
+ * @return {Node} Result.
+ * @api stable
+ */
+ol.format.WFS.prototype.writeTransaction = function(inserts, updates, deletes,
+    options) {
+  var objectStack = [];
+  var node = ol.xml.createElementNS('http://www.opengis.net/wfs',
+      'Transaction');
+  node.setAttribute('service', 'WFS');
+  node.setAttribute('version', '1.1.0');
+  var baseObj, obj;
+  if (options) {
+    baseObj = options.gmlOptions ? options.gmlOptions : {};
+    if (options.handle) {
+      node.setAttribute('handle', options.handle);
+    }
+  }
+  ol.xml.setAttributeNS(node, 'http://www.w3.org/2001/XMLSchema-instance',
+      'xsi:schemaLocation', this.schemaLocation_);
+  if (inserts) {
+    obj = {node: node, featureNS: options.featureNS,
+      featureType: options.featureType, featurePrefix: options.featurePrefix};
+    goog.object.extend(obj, baseObj);
+    ol.xml.pushSerializeAndPop(obj,
+        ol.format.WFS.TRANSACTION_SERIALIZERS_,
+        ol.xml.makeSimpleNodeFactory('Insert'), inserts,
+        objectStack);
+  }
+  if (updates) {
+    obj = {node: node, featureNS: options.featureNS,
+      featureType: options.featureType, featurePrefix: options.featurePrefix};
+    goog.object.extend(obj, baseObj);
+    ol.xml.pushSerializeAndPop(obj,
+        ol.format.WFS.TRANSACTION_SERIALIZERS_,
+        ol.xml.makeSimpleNodeFactory('Update'), updates,
+        objectStack);
+  }
+  if (deletes) {
+    ol.xml.pushSerializeAndPop({node: node, featureNS: options.featureNS,
+      featureType: options.featureType, featurePrefix: options.featurePrefix},
+    ol.format.WFS.TRANSACTION_SERIALIZERS_,
+    ol.xml.makeSimpleNodeFactory('Delete'), deletes,
+    objectStack);
+  }
+  if (options.nativeElements) {
+    ol.xml.pushSerializeAndPop({node: node, featureNS: options.featureNS,
+      featureType: options.featureType, featurePrefix: options.featurePrefix},
+    ol.format.WFS.TRANSACTION_SERIALIZERS_,
+    ol.xml.makeSimpleNodeFactory('Native'), options.nativeElements,
+    objectStack);
+  }
+  return node;
+};
+
+
+/**
+ * Read the projection from a WFS source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @return {?ol.proj.Projection} Projection.
+ * @api stable
+ */
+ol.format.WFS.prototype.readProjection;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.WFS.prototype.readProjectionFromDocument = function(doc) {
+  goog.asserts.assert(doc.nodeType == goog.dom.NodeType.DOCUMENT,
+      'doc.nodeType should be a DOCUMENT');
+  for (var n = doc.firstChild; n; n = n.nextSibling) {
+    if (n.nodeType == goog.dom.NodeType.ELEMENT) {
+      return this.readProjectionFromNode(n);
+    }
+  }
+  return null;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.WFS.prototype.readProjectionFromNode = function(node) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'FeatureCollection',
+      'localName should be FeatureCollection');
+
+  if (node.firstElementChild &&
+      node.firstElementChild.firstElementChild) {
+    node = node.firstElementChild.firstElementChild;
+    for (var n = node.firstElementChild; n; n = n.nextElementSibling) {
+      if (!(n.childNodes.length === 0 ||
+          (n.childNodes.length === 1 &&
+          n.firstChild.nodeType === 3))) {
+        var objectStack = [{}];
+        this.gmlFormat_.readGeometryElement(n, objectStack);
+        return ol.proj.get(objectStack.pop().srsName);
+      }
+    }
+  }
+
+  return null;
+};
+
+goog.provide('ol.format.WKT');
+
+goog.require('goog.asserts');
+goog.require('ol');
+goog.require('ol.Feature');
+goog.require('ol.format.Feature');
+goog.require('ol.format.TextFeature');
+goog.require('ol.geom.Geometry');
+goog.require('ol.geom.GeometryCollection');
+goog.require('ol.geom.GeometryType');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.MultiLineString');
+goog.require('ol.geom.MultiPoint');
+goog.require('ol.geom.MultiPolygon');
+goog.require('ol.geom.Point');
+goog.require('ol.geom.Polygon');
+
+
+
+/**
+ * @classdesc
+ * Geometry format for reading and writing data in the `WellKnownText` (WKT)
+ * format.
+ *
+ * @constructor
+ * @extends {ol.format.TextFeature}
+ * @param {olx.format.WKTOptions=} opt_options Options.
+ * @api stable
+ */
+ol.format.WKT = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  goog.base(this);
+
+  /**
+   * Split GeometryCollection into multiple features.
+   * @type {boolean}
+   * @private
+   */
+  this.splitCollection_ = options.splitCollection !== undefined ?
+      options.splitCollection : false;
+
+};
+goog.inherits(ol.format.WKT, ol.format.TextFeature);
+
+
+/**
+ * @const
+ * @type {string}
+ */
+ol.format.WKT.EMPTY = 'EMPTY';
+
+
+/**
+ * @param {ol.geom.Point} geom Point geometry.
+ * @return {string} Coordinates part of Point as WKT.
+ * @private
+ */
+ol.format.WKT.encodePointGeometry_ = function(geom) {
+  var coordinates = geom.getCoordinates();
+  if (coordinates.length === 0) {
+    return '';
+  }
+  return coordinates[0] + ' ' + coordinates[1];
+};
+
+
+/**
+ * @param {ol.geom.MultiPoint} geom MultiPoint geometry.
+ * @return {string} Coordinates part of MultiPoint as WKT.
+ * @private
+ */
+ol.format.WKT.encodeMultiPointGeometry_ = function(geom) {
+  var array = [];
+  var components = geom.getPoints();
+  for (var i = 0, ii = components.length; i < ii; ++i) {
+    array.push('(' + ol.format.WKT.encodePointGeometry_(components[i]) + ')');
+  }
+  return array.join(',');
+};
+
+
+/**
+ * @param {ol.geom.GeometryCollection} geom GeometryCollection geometry.
+ * @return {string} Coordinates part of GeometryCollection as WKT.
+ * @private
+ */
+ol.format.WKT.encodeGeometryCollectionGeometry_ = function(geom) {
+  var array = [];
+  var geoms = geom.getGeometries();
+  for (var i = 0, ii = geoms.length; i < ii; ++i) {
+    array.push(ol.format.WKT.encode_(geoms[i]));
+  }
+  return array.join(',');
+};
+
+
+/**
+ * @param {ol.geom.LineString|ol.geom.LinearRing} geom LineString geometry.
+ * @return {string} Coordinates part of LineString as WKT.
+ * @private
+ */
+ol.format.WKT.encodeLineStringGeometry_ = function(geom) {
+  var coordinates = geom.getCoordinates();
+  var array = [];
+  for (var i = 0, ii = coordinates.length; i < ii; ++i) {
+    array.push(coordinates[i][0] + ' ' + coordinates[i][1]);
+  }
+  return array.join(',');
+};
+
+
+/**
+ * @param {ol.geom.MultiLineString} geom MultiLineString geometry.
+ * @return {string} Coordinates part of MultiLineString as WKT.
+ * @private
+ */
+ol.format.WKT.encodeMultiLineStringGeometry_ = function(geom) {
+  var array = [];
+  var components = geom.getLineStrings();
+  for (var i = 0, ii = components.length; i < ii; ++i) {
+    array.push('(' + ol.format.WKT.encodeLineStringGeometry_(
+        components[i]) + ')');
+  }
+  return array.join(',');
+};
+
+
+/**
+ * @param {ol.geom.Polygon} geom Polygon geometry.
+ * @return {string} Coordinates part of Polygon as WKT.
+ * @private
+ */
+ol.format.WKT.encodePolygonGeometry_ = function(geom) {
+  var array = [];
+  var rings = geom.getLinearRings();
+  for (var i = 0, ii = rings.length; i < ii; ++i) {
+    array.push('(' + ol.format.WKT.encodeLineStringGeometry_(
+        rings[i]) + ')');
+  }
+  return array.join(',');
+};
+
+
+/**
+ * @param {ol.geom.MultiPolygon} geom MultiPolygon geometry.
+ * @return {string} Coordinates part of MultiPolygon as WKT.
+ * @private
+ */
+ol.format.WKT.encodeMultiPolygonGeometry_ = function(geom) {
+  var array = [];
+  var components = geom.getPolygons();
+  for (var i = 0, ii = components.length; i < ii; ++i) {
+    array.push('(' + ol.format.WKT.encodePolygonGeometry_(
+        components[i]) + ')');
+  }
+  return array.join(',');
+};
+
+
+/**
+ * Encode a geometry as WKT.
+ * @param {ol.geom.Geometry} geom The geometry to encode.
+ * @return {string} WKT string for the geometry.
+ * @private
+ */
+ol.format.WKT.encode_ = function(geom) {
+  var type = geom.getType();
+  var geometryEncoder = ol.format.WKT.GeometryEncoder_[type];
+  goog.asserts.assert(geometryEncoder, 'geometryEncoder should be defined');
+  var enc = geometryEncoder(geom);
+  type = type.toUpperCase();
+  if (enc.length === 0) {
+    return type + ' ' + ol.format.WKT.EMPTY;
+  }
+  return type + '(' + enc + ')';
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, function(ol.geom.Geometry): string>}
+ * @private
+ */
+ol.format.WKT.GeometryEncoder_ = {
+  'Point': ol.format.WKT.encodePointGeometry_,
+  'LineString': ol.format.WKT.encodeLineStringGeometry_,
+  'Polygon': ol.format.WKT.encodePolygonGeometry_,
+  'MultiPoint': ol.format.WKT.encodeMultiPointGeometry_,
+  'MultiLineString': ol.format.WKT.encodeMultiLineStringGeometry_,
+  'MultiPolygon': ol.format.WKT.encodeMultiPolygonGeometry_,
+  'GeometryCollection': ol.format.WKT.encodeGeometryCollectionGeometry_
+};
+
+
+/**
+ * Parse a WKT string.
+ * @param {string} wkt WKT string.
+ * @return {ol.geom.Geometry|ol.geom.GeometryCollection|undefined}
+ *     The geometry created.
+ * @private
+ */
+ol.format.WKT.prototype.parse_ = function(wkt) {
+  var lexer = new ol.format.WKT.Lexer(wkt);
+  var parser = new ol.format.WKT.Parser(lexer);
+  return parser.parse();
+};
+
+
+/**
+ * Read a feature from a WKT source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {ol.Feature} Feature.
+ * @api stable
+ */
+ol.format.WKT.prototype.readFeature;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.WKT.prototype.readFeatureFromText = function(text, opt_options) {
+  var geom = this.readGeometryFromText(text, opt_options);
+  if (geom) {
+    var feature = new ol.Feature();
+    feature.setGeometry(geom);
+    return feature;
+  }
+  return null;
+};
+
+
+/**
+ * Read all features from a WKT source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {Array.<ol.Feature>} Features.
+ * @api stable
+ */
+ol.format.WKT.prototype.readFeatures;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.WKT.prototype.readFeaturesFromText = function(text, opt_options) {
+  var geometries = [];
+  var geometry = this.readGeometryFromText(text, opt_options);
+  if (this.splitCollection_ &&
+      geometry.getType() == ol.geom.GeometryType.GEOMETRY_COLLECTION) {
+    geometries = (/** @type {ol.geom.GeometryCollection} */ (geometry))
+        .getGeometriesArray();
+  } else {
+    geometries = [geometry];
+  }
+  var feature, features = [];
+  for (var i = 0, ii = geometries.length; i < ii; ++i) {
+    feature = new ol.Feature();
+    feature.setGeometry(geometries[i]);
+    features.push(feature);
+  }
+  return features;
+};
+
+
+/**
+ * Read a single geometry from a WKT source.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Read options.
+ * @return {ol.geom.Geometry} Geometry.
+ * @api stable
+ */
+ol.format.WKT.prototype.readGeometry;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.WKT.prototype.readGeometryFromText = function(text, opt_options) {
+  var geometry = this.parse_(text);
+  if (geometry) {
+    return /** @type {ol.geom.Geometry} */ (
+        ol.format.Feature.transformWithOptions(geometry, false, opt_options));
+  } else {
+    return null;
+  }
+};
+
+
+/**
+ * Encode a feature as a WKT string.
+ *
+ * @function
+ * @param {ol.Feature} feature Feature.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {string} WKT string.
+ * @api stable
+ */
+ol.format.WKT.prototype.writeFeature;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.WKT.prototype.writeFeatureText = function(feature, opt_options) {
+  var geometry = feature.getGeometry();
+  if (geometry) {
+    return this.writeGeometryText(geometry, opt_options);
+  }
+  return '';
+};
+
+
+/**
+ * Encode an array of features as a WKT string.
+ *
+ * @function
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {olx.format.WriteOptions=} opt_options Write options.
+ * @return {string} WKT string.
+ * @api stable
+ */
+ol.format.WKT.prototype.writeFeatures;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.WKT.prototype.writeFeaturesText = function(features, opt_options) {
+  if (features.length == 1) {
+    return this.writeFeatureText(features[0], opt_options);
+  }
+  var geometries = [];
+  for (var i = 0, ii = features.length; i < ii; ++i) {
+    geometries.push(features[i].getGeometry());
+  }
+  var collection = new ol.geom.GeometryCollection(geometries);
+  return this.writeGeometryText(collection, opt_options);
+};
+
+
+/**
+ * Write a single geometry as a WKT string.
+ *
+ * @function
+ * @param {ol.geom.Geometry} geometry Geometry.
+ * @return {string} WKT string.
+ * @api stable
+ */
+ol.format.WKT.prototype.writeGeometry;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.WKT.prototype.writeGeometryText = function(geometry, opt_options) {
+  return ol.format.WKT.encode_(/** @type {ol.geom.Geometry} */ (
+      ol.format.Feature.transformWithOptions(geometry, true, opt_options)));
+};
+
+
+/**
+ * @typedef {{type: number, value: (number|string|undefined), position: number}}
+ */
+ol.format.WKT.Token;
+
+
+/**
+ * @const
+ * @enum {number}
+ */
+ol.format.WKT.TokenType = {
+  TEXT: 1,
+  LEFT_PAREN: 2,
+  RIGHT_PAREN: 3,
+  NUMBER: 4,
+  COMMA: 5,
+  EOF: 6
+};
+
+
+
+/**
+ * Class to tokenize a WKT string.
+ * @param {string} wkt WKT string.
+ * @constructor
+ * @protected
+ */
+ol.format.WKT.Lexer = function(wkt) {
+
+  /**
+   * @type {string}
+   */
+  this.wkt = wkt;
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.index_ = -1;
+};
+
+
+/**
+ * @param {string} c Character.
+ * @return {boolean} Whether the character is alphabetic.
+ * @private
+ */
+ol.format.WKT.Lexer.prototype.isAlpha_ = function(c) {
+  return c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z';
+};
+
+
+/**
+ * @param {string} c Character.
+ * @param {boolean=} opt_decimal Whether the string number
+ *     contains a dot, i.e. is a decimal number.
+ * @return {boolean} Whether the character is numeric.
+ * @private
+ */
+ol.format.WKT.Lexer.prototype.isNumeric_ = function(c, opt_decimal) {
+  var decimal = opt_decimal !== undefined ? opt_decimal : false;
+  return c >= '0' && c <= '9' || c == '.' && !decimal;
+};
+
+
+/**
+ * @param {string} c Character.
+ * @return {boolean} Whether the character is whitespace.
+ * @private
+ */
+ol.format.WKT.Lexer.prototype.isWhiteSpace_ = function(c) {
+  return c == ' ' || c == '\t' || c == '\r' || c == '\n';
+};
+
+
+/**
+ * @return {string} Next string character.
+ * @private
+ */
+ol.format.WKT.Lexer.prototype.nextChar_ = function() {
+  return this.wkt.charAt(++this.index_);
+};
+
+
+/**
+ * Fetch and return the next token.
+ * @return {!ol.format.WKT.Token} Next string token.
+ */
+ol.format.WKT.Lexer.prototype.nextToken = function() {
+  var c = this.nextChar_();
+  var token = {position: this.index_, value: c};
+
+  if (c == '(') {
+    token.type = ol.format.WKT.TokenType.LEFT_PAREN;
+  } else if (c == ',') {
+    token.type = ol.format.WKT.TokenType.COMMA;
+  } else if (c == ')') {
+    token.type = ol.format.WKT.TokenType.RIGHT_PAREN;
+  } else if (this.isNumeric_(c) || c == '-') {
+    token.type = ol.format.WKT.TokenType.NUMBER;
+    token.value = this.readNumber_();
+  } else if (this.isAlpha_(c)) {
+    token.type = ol.format.WKT.TokenType.TEXT;
+    token.value = this.readText_();
+  } else if (this.isWhiteSpace_(c)) {
+    return this.nextToken();
+  } else if (c === '') {
+    token.type = ol.format.WKT.TokenType.EOF;
+  } else {
+    throw new Error('Unexpected character: ' + c);
+  }
+
+  return token;
+};
+
+
+/**
+ * @return {number} Numeric token value.
+ * @private
+ */
+ol.format.WKT.Lexer.prototype.readNumber_ = function() {
+  var c, index = this.index_;
+  var decimal = false;
+  var scientificNotation = false;
+  do {
+    if (c == '.') {
+      decimal = true;
+    } else if (c == 'e' || c == 'E') {
+      scientificNotation = true;
+    }
+    c = this.nextChar_();
+  } while (
+      this.isNumeric_(c, decimal) ||
+      // if we haven't detected a scientific number before, 'e' or 'E'
+      // hint that we should continue to read
+      !scientificNotation && (c == 'e' || c == 'E') ||
+      // once we know that we have a scientific number, both '-' and '+'
+      // are allowed
+      scientificNotation && (c == '-' || c == '+')
+  );
+  return parseFloat(this.wkt.substring(index, this.index_--));
+};
+
+
+/**
+ * @return {string} String token value.
+ * @private
+ */
+ol.format.WKT.Lexer.prototype.readText_ = function() {
+  var c, index = this.index_;
+  do {
+    c = this.nextChar_();
+  } while (this.isAlpha_(c));
+  return this.wkt.substring(index, this.index_--).toUpperCase();
+};
+
+
+
+/**
+ * Class to parse the tokens from the WKT string.
+ * @param {ol.format.WKT.Lexer} lexer
+ * @constructor
+ * @protected
+ */
+ol.format.WKT.Parser = function(lexer) {
+
+  /**
+   * @type {ol.format.WKT.Lexer}
+   * @private
+   */
+  this.lexer_ = lexer;
+
+  /**
+   * @type {ol.format.WKT.Token}
+   * @private
+   */
+  this.token_;
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.dimension_ = 2;
+};
+
+
+/**
+ * Fetch the next token form the lexer and replace the active token.
+ * @private
+ */
+ol.format.WKT.Parser.prototype.consume_ = function() {
+  this.token_ = this.lexer_.nextToken();
+};
+
+
+/**
+ * If the given type matches the current token, consume it.
+ * @param {ol.format.WKT.TokenType.<number>} type Token type.
+ * @return {boolean} Whether the token matches the given type.
+ */
+ol.format.WKT.Parser.prototype.match = function(type) {
+  var isMatch = this.token_.type == type;
+  if (isMatch) {
+    this.consume_();
+  }
+  return isMatch;
+};
+
+
+/**
+ * Try to parse the tokens provided by the lexer.
+ * @return {ol.geom.Geometry|ol.geom.GeometryCollection} The geometry.
+ */
+ol.format.WKT.Parser.prototype.parse = function() {
+  this.consume_();
+  var geometry = this.parseGeometry_();
+  goog.asserts.assert(this.token_.type == ol.format.WKT.TokenType.EOF,
+      'token type should be end of file');
+  return geometry;
+};
+
+
+/**
+ * @return {!(ol.geom.Geometry|ol.geom.GeometryCollection)} The geometry.
+ * @private
+ */
+ol.format.WKT.Parser.prototype.parseGeometry_ = function() {
+  var token = this.token_;
+  if (this.match(ol.format.WKT.TokenType.TEXT)) {
+    var geomType = token.value;
+    if (geomType == ol.geom.GeometryType.GEOMETRY_COLLECTION.toUpperCase()) {
+      var geometries = this.parseGeometryCollectionText_();
+      return new ol.geom.GeometryCollection(geometries);
+    } else {
+      var parser = ol.format.WKT.Parser.GeometryParser_[geomType];
+      var ctor = ol.format.WKT.Parser.GeometryConstructor_[geomType];
+      if (!parser || !ctor) {
+        throw new Error('Invalid geometry type: ' + geomType);
+      }
+      var coordinates = parser.call(this);
+      return new ctor(coordinates);
+    }
+  }
+  throw new Error(this.formatErrorMessage_());
+};
+
+
+/**
+ * @return {!Array.<ol.geom.Geometry>} A collection of geometries.
+ * @private
+ */
+ol.format.WKT.Parser.prototype.parseGeometryCollectionText_ = function() {
+  if (this.match(ol.format.WKT.TokenType.LEFT_PAREN)) {
+    var geometries = [];
+    do {
+      geometries.push(this.parseGeometry_());
+    } while (this.match(ol.format.WKT.TokenType.COMMA));
+    if (this.match(ol.format.WKT.TokenType.RIGHT_PAREN)) {
+      return geometries;
+    }
+  } else if (this.isEmptyGeometry_()) {
+    return [];
+  }
+  throw new Error(this.formatErrorMessage_());
+};
+
+
+/**
+ * @return {Array.<number>} All values in a point.
+ * @private
+ */
+ol.format.WKT.Parser.prototype.parsePointText_ = function() {
+  if (this.match(ol.format.WKT.TokenType.LEFT_PAREN)) {
+    var coordinates = this.parsePoint_();
+    if (this.match(ol.format.WKT.TokenType.RIGHT_PAREN)) {
+      return coordinates;
+    }
+  } else if (this.isEmptyGeometry_()) {
+    return null;
+  }
+  throw new Error(this.formatErrorMessage_());
+};
+
+
+/**
+ * @return {!Array.<!Array.<number>>} All points in a linestring.
+ * @private
+ */
+ol.format.WKT.Parser.prototype.parseLineStringText_ = function() {
+  if (this.match(ol.format.WKT.TokenType.LEFT_PAREN)) {
+    var coordinates = this.parsePointList_();
+    if (this.match(ol.format.WKT.TokenType.RIGHT_PAREN)) {
+      return coordinates;
+    }
+  } else if (this.isEmptyGeometry_()) {
+    return [];
+  }
+  throw new Error(this.formatErrorMessage_());
+};
+
+
+/**
+ * @return {!Array.<!Array.<number>>} All points in a polygon.
+ * @private
+ */
+ol.format.WKT.Parser.prototype.parsePolygonText_ = function() {
+  if (this.match(ol.format.WKT.TokenType.LEFT_PAREN)) {
+    var coordinates = this.parseLineStringTextList_();
+    if (this.match(ol.format.WKT.TokenType.RIGHT_PAREN)) {
+      return coordinates;
+    }
+  } else if (this.isEmptyGeometry_()) {
+    return [];
+  }
+  throw new Error(this.formatErrorMessage_());
+};
+
+
+/**
+ * @return {!Array.<!Array.<number>>} All points in a multipoint.
+ * @private
+ */
+ol.format.WKT.Parser.prototype.parseMultiPointText_ = function() {
+  if (this.match(ol.format.WKT.TokenType.LEFT_PAREN)) {
+    var coordinates;
+    if (this.token_.type == ol.format.WKT.TokenType.LEFT_PAREN) {
+      coordinates = this.parsePointTextList_();
+    } else {
+      coordinates = this.parsePointList_();
+    }
+    if (this.match(ol.format.WKT.TokenType.RIGHT_PAREN)) {
+      return coordinates;
+    }
+  } else if (this.isEmptyGeometry_()) {
+    return [];
+  }
+  throw new Error(this.formatErrorMessage_());
+};
+
+
+/**
+ * @return {!Array.<!Array.<number>>} All linestring points
+ *                                        in a multilinestring.
+ * @private
+ */
+ol.format.WKT.Parser.prototype.parseMultiLineStringText_ = function() {
+  if (this.match(ol.format.WKT.TokenType.LEFT_PAREN)) {
+    var coordinates = this.parseLineStringTextList_();
+    if (this.match(ol.format.WKT.TokenType.RIGHT_PAREN)) {
+      return coordinates;
+    }
+  } else if (this.isEmptyGeometry_()) {
+    return [];
+  }
+  throw new Error(this.formatErrorMessage_());
+};
+
+
+/**
+ * @return {!Array.<!Array.<number>>} All polygon points in a multipolygon.
+ * @private
+ */
+ol.format.WKT.Parser.prototype.parseMultiPolygonText_ = function() {
+  if (this.match(ol.format.WKT.TokenType.LEFT_PAREN)) {
+    var coordinates = this.parsePolygonTextList_();
+    if (this.match(ol.format.WKT.TokenType.RIGHT_PAREN)) {
+      return coordinates;
+    }
+  } else if (this.isEmptyGeometry_()) {
+    return [];
+  }
+  throw new Error(this.formatErrorMessage_());
+};
+
+
+/**
+ * @return {!Array.<number>} A point.
+ * @private
+ */
+ol.format.WKT.Parser.prototype.parsePoint_ = function() {
+  var coordinates = [];
+  for (var i = 0; i < this.dimension_; ++i) {
+    var token = this.token_;
+    if (this.match(ol.format.WKT.TokenType.NUMBER)) {
+      coordinates.push(token.value);
+    } else {
+      break;
+    }
+  }
+  if (coordinates.length == this.dimension_) {
+    return coordinates;
+  }
+  throw new Error(this.formatErrorMessage_());
+};
+
+
+/**
+ * @return {!Array.<!Array.<number>>} An array of points.
+ * @private
+ */
+ol.format.WKT.Parser.prototype.parsePointList_ = function() {
+  var coordinates = [this.parsePoint_()];
+  while (this.match(ol.format.WKT.TokenType.COMMA)) {
+    coordinates.push(this.parsePoint_());
+  }
+  return coordinates;
+};
+
+
+/**
+ * @return {!Array.<!Array.<number>>} An array of points.
+ * @private
+ */
+ol.format.WKT.Parser.prototype.parsePointTextList_ = function() {
+  var coordinates = [this.parsePointText_()];
+  while (this.match(ol.format.WKT.TokenType.COMMA)) {
+    coordinates.push(this.parsePointText_());
+  }
+  return coordinates;
+};
+
+
+/**
+ * @return {!Array.<!Array.<number>>} An array of points.
+ * @private
+ */
+ol.format.WKT.Parser.prototype.parseLineStringTextList_ = function() {
+  var coordinates = [this.parseLineStringText_()];
+  while (this.match(ol.format.WKT.TokenType.COMMA)) {
+    coordinates.push(this.parseLineStringText_());
+  }
+  return coordinates;
+};
+
+
+/**
+ * @return {!Array.<!Array.<number>>} An array of points.
+ * @private
+ */
+ol.format.WKT.Parser.prototype.parsePolygonTextList_ = function() {
+  var coordinates = [this.parsePolygonText_()];
+  while (this.match(ol.format.WKT.TokenType.COMMA)) {
+    coordinates.push(this.parsePolygonText_());
+  }
+  return coordinates;
+};
+
+
+/**
+ * @return {boolean} Whether the token implies an empty geometry.
+ * @private
+ */
+ol.format.WKT.Parser.prototype.isEmptyGeometry_ = function() {
+  var isEmpty = this.token_.type == ol.format.WKT.TokenType.TEXT &&
+      this.token_.value == ol.format.WKT.EMPTY;
+  if (isEmpty) {
+    this.consume_();
+  }
+  return isEmpty;
+};
+
+
+/**
+ * Create an error message for an unexpected token error.
+ * @return {string} Error message.
+ * @private
+ */
+ol.format.WKT.Parser.prototype.formatErrorMessage_ = function() {
+  return 'Unexpected `' + this.token_.value + '` at position ' +
+      this.token_.position + ' in `' + this.lexer_.wkt + '`';
+};
+
+
+/**
+ * @enum {function (new:ol.geom.Geometry, Array, ol.geom.GeometryLayout.<string>=)}
+ * @private
+ */
+ol.format.WKT.Parser.GeometryConstructor_ = {
+  'POINT': ol.geom.Point,
+  'LINESTRING': ol.geom.LineString,
+  'POLYGON': ol.geom.Polygon,
+  'MULTIPOINT': ol.geom.MultiPoint,
+  'MULTILINESTRING': ol.geom.MultiLineString,
+  'MULTIPOLYGON': ol.geom.MultiPolygon
+};
+
+
+/**
+ * @enum {(function(): Array)}
+ * @private
+ */
+ol.format.WKT.Parser.GeometryParser_ = {
+  'POINT': ol.format.WKT.Parser.prototype.parsePointText_,
+  'LINESTRING': ol.format.WKT.Parser.prototype.parseLineStringText_,
+  'POLYGON': ol.format.WKT.Parser.prototype.parsePolygonText_,
+  'MULTIPOINT': ol.format.WKT.Parser.prototype.parseMultiPointText_,
+  'MULTILINESTRING': ol.format.WKT.Parser.prototype.parseMultiLineStringText_,
+  'MULTIPOLYGON': ol.format.WKT.Parser.prototype.parseMultiPolygonText_
+};
+
+goog.provide('ol.format.WMSCapabilities');
+
+goog.require('goog.asserts');
+goog.require('goog.dom.NodeType');
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.format.XLink');
+goog.require('ol.format.XML');
+goog.require('ol.format.XSD');
+goog.require('ol.xml');
+
+
+
+/**
+ * @classdesc
+ * Format for reading WMS capabilities data
+ *
+ * @constructor
+ * @extends {ol.format.XML}
+ * @api
+ */
+ol.format.WMSCapabilities = function() {
+
+  goog.base(this);
+
+  /**
+   * @type {string|undefined}
+   */
+  this.version = undefined;
+};
+goog.inherits(ol.format.WMSCapabilities, ol.format.XML);
+
+
+/**
+ * Read a WMS capabilities document.
+ *
+ * @function
+ * @param {Document|Node|string} source The XML source.
+ * @return {Object} An object representing the WMS capabilities.
+ * @api
+ */
+ol.format.WMSCapabilities.prototype.read;
+
+
+/**
+ * @param {Document} doc Document.
+ * @return {Object} WMS Capability object.
+ */
+ol.format.WMSCapabilities.prototype.readFromDocument = function(doc) {
+  goog.asserts.assert(doc.nodeType == goog.dom.NodeType.DOCUMENT,
+      'doc.nodeType should be DOCUMENT');
+  for (var n = doc.firstChild; n; n = n.nextSibling) {
+    if (n.nodeType == goog.dom.NodeType.ELEMENT) {
+      return this.readFromNode(n);
+    }
+  }
+  return null;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @return {Object} WMS Capability object.
+ */
+ol.format.WMSCapabilities.prototype.readFromNode = function(node) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'WMS_Capabilities' ||
+      node.localName == 'WMT_MS_Capabilities',
+      'localName should be WMS_Capabilities or WMT_MS_Capabilities');
+  this.version = node.getAttribute('version').trim();
+  goog.asserts.assertString(this.version, 'this.version should be a string');
+  var wmsCapabilityObject = ol.xml.pushParseAndPop({
+    'version': this.version
+  }, ol.format.WMSCapabilities.PARSERS_, node, []);
+  return wmsCapabilityObject ? wmsCapabilityObject : null;
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Attribution object.
+ */
+ol.format.WMSCapabilities.readAttribution_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Attribution',
+      'localName should be Attribution');
+  return ol.xml.pushParseAndPop(
+      {}, ol.format.WMSCapabilities.ATTRIBUTION_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object} Bounding box object.
+ */
+ol.format.WMSCapabilities.readBoundingBox_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'BoundingBox',
+      'localName should be BoundingBox');
+
+  var extent = [
+    ol.format.XSD.readDecimalString(node.getAttribute('minx')),
+    ol.format.XSD.readDecimalString(node.getAttribute('miny')),
+    ol.format.XSD.readDecimalString(node.getAttribute('maxx')),
+    ol.format.XSD.readDecimalString(node.getAttribute('maxy'))
+  ];
+
+  var resolutions = [
+    ol.format.XSD.readDecimalString(node.getAttribute('resx')),
+    ol.format.XSD.readDecimalString(node.getAttribute('resy'))
+  ];
+
+  return {
+    'crs': node.getAttribute('CRS'),
+    'extent': extent,
+    'res': resolutions
+  };
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {ol.Extent|undefined} Bounding box object.
+ */
+ol.format.WMSCapabilities.readEXGeographicBoundingBox_ =
+    function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'EX_GeographicBoundingBox',
+      'localName should be EX_GeographicBoundingBox');
+  var geographicBoundingBox = ol.xml.pushParseAndPop(
+      {},
+      ol.format.WMSCapabilities.EX_GEOGRAPHIC_BOUNDING_BOX_PARSERS_,
+      node, objectStack);
+  if (!geographicBoundingBox) {
+    return undefined;
+  }
+  var westBoundLongitude = /** @type {number|undefined} */
+      (geographicBoundingBox['westBoundLongitude']);
+  var southBoundLatitude = /** @type {number|undefined} */
+      (geographicBoundingBox['southBoundLatitude']);
+  var eastBoundLongitude = /** @type {number|undefined} */
+      (geographicBoundingBox['eastBoundLongitude']);
+  var northBoundLatitude = /** @type {number|undefined} */
+      (geographicBoundingBox['northBoundLatitude']);
+  if (westBoundLongitude === undefined || southBoundLatitude === undefined ||
+      eastBoundLongitude === undefined || northBoundLatitude === undefined) {
+    return undefined;
+  }
+  return /** @type {ol.Extent} */ ([
+    westBoundLongitude, southBoundLatitude,
+    eastBoundLongitude, northBoundLatitude
+  ]);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined} Capability object.
+ */
+ol.format.WMSCapabilities.readCapability_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Capability',
+      'localName should be Capability');
+  return ol.xml.pushParseAndPop(
+      {}, ol.format.WMSCapabilities.CAPABILITY_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined} Service object.
+ */
+ol.format.WMSCapabilities.readService_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Service',
+      'localName should be Service');
+  return ol.xml.pushParseAndPop(
+      {}, ol.format.WMSCapabilities.SERVICE_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined} Contact information object.
+ */
+ol.format.WMSCapabilities.readContactInformation_ =
+    function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType shpuld be ELEMENT');
+  goog.asserts.assert(node.localName == 'ContactInformation',
+      'localName should be ContactInformation');
+  return ol.xml.pushParseAndPop(
+      {}, ol.format.WMSCapabilities.CONTACT_INFORMATION_PARSERS_,
+      node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined} Contact person object.
+ */
+ol.format.WMSCapabilities.readContactPersonPrimary_ =
+    function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'ContactPersonPrimary',
+      'localName should be ContactPersonPrimary');
+  return ol.xml.pushParseAndPop(
+      {}, ol.format.WMSCapabilities.CONTACT_PERSON_PARSERS_,
+      node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined} Contact address object.
+ */
+ol.format.WMSCapabilities.readContactAddress_ =
+    function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'ContactAddress',
+      'localName should be ContactAddress');
+  return ol.xml.pushParseAndPop(
+      {}, ol.format.WMSCapabilities.CONTACT_ADDRESS_PARSERS_,
+      node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Array.<string>|undefined} Format array.
+ */
+ol.format.WMSCapabilities.readException_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Exception',
+      'localName should be Exception');
+  return ol.xml.pushParseAndPop(
+      [], ol.format.WMSCapabilities.EXCEPTION_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @private
+ * @return {Object|undefined} Layer object.
+ */
+ol.format.WMSCapabilities.readCapabilityLayer_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Layer', 'localName should be Layer');
+  return ol.xml.pushParseAndPop(
+      {}, ol.format.WMSCapabilities.LAYER_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Layer object.
+ */
+ol.format.WMSCapabilities.readLayer_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Layer', 'localName should be Layer');
+  var parentLayerObject = /**  @type {Object.<string,*>} */
+      (objectStack[objectStack.length - 1]);
+
+  var layerObject = /**  @type {Object.<string,*>} */ (ol.xml.pushParseAndPop(
+      {}, ol.format.WMSCapabilities.LAYER_PARSERS_, node, objectStack));
+
+  if (!layerObject) {
+    return undefined;
+  }
+  var queryable =
+      ol.format.XSD.readBooleanString(node.getAttribute('queryable'));
+  if (queryable === undefined) {
+    queryable = parentLayerObject['queryable'];
+  }
+  layerObject['queryable'] = queryable !== undefined ? queryable : false;
+
+  var cascaded = ol.format.XSD.readNonNegativeIntegerString(
+      node.getAttribute('cascaded'));
+  if (cascaded === undefined) {
+    cascaded = parentLayerObject['cascaded'];
+  }
+  layerObject['cascaded'] = cascaded;
+
+  var opaque = ol.format.XSD.readBooleanString(node.getAttribute('opaque'));
+  if (opaque === undefined) {
+    opaque = parentLayerObject['opaque'];
+  }
+  layerObject['opaque'] = opaque !== undefined ? opaque : false;
+
+  var noSubsets =
+      ol.format.XSD.readBooleanString(node.getAttribute('noSubsets'));
+  if (noSubsets === undefined) {
+    noSubsets = parentLayerObject['noSubsets'];
+  }
+  layerObject['noSubsets'] = noSubsets !== undefined ? noSubsets : false;
+
+  var fixedWidth =
+      ol.format.XSD.readDecimalString(node.getAttribute('fixedWidth'));
+  if (!fixedWidth) {
+    fixedWidth = parentLayerObject['fixedWidth'];
+  }
+  layerObject['fixedWidth'] = fixedWidth;
+
+  var fixedHeight =
+      ol.format.XSD.readDecimalString(node.getAttribute('fixedHeight'));
+  if (!fixedHeight) {
+    fixedHeight = parentLayerObject['fixedHeight'];
+  }
+  layerObject['fixedHeight'] = fixedHeight;
+
+  // See 7.2.4.8
+  var addKeys = ['Style', 'CRS', 'AuthorityURL'];
+  addKeys.forEach(function(key) {
+    if (key in parentLayerObject) {
+      var childValue = goog.object.setIfUndefined(layerObject, key, []);
+      childValue = childValue.concat(parentLayerObject[key]);
+      layerObject[key] = childValue;
+    }
+  });
+
+  var replaceKeys = ['EX_GeographicBoundingBox', 'BoundingBox', 'Dimension',
+    'Attribution', 'MinScaleDenominator', 'MaxScaleDenominator'];
+  replaceKeys.forEach(function(key) {
+    if (!(key in layerObject)) {
+      var parentValue = parentLayerObject[key];
+      layerObject[key] = parentValue;
+    }
+  });
+
+  return layerObject;
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object} Dimension object.
+ */
+ol.format.WMSCapabilities.readDimension_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Dimension',
+      'localName should be Dimension');
+  var dimensionObject = {
+    'name': node.getAttribute('name'),
+    'units': node.getAttribute('units'),
+    'unitSymbol': node.getAttribute('unitSymbol'),
+    'default': node.getAttribute('default'),
+    'multipleValues': ol.format.XSD.readBooleanString(
+        node.getAttribute('multipleValues')),
+    'nearestValue': ol.format.XSD.readBooleanString(
+        node.getAttribute('nearestValue')),
+    'current': ol.format.XSD.readBooleanString(node.getAttribute('current')),
+    'values': ol.format.XSD.readString(node)
+  };
+  return dimensionObject;
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Online resource object.
+ */
+ol.format.WMSCapabilities.readFormatOnlineresource_ =
+    function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  return ol.xml.pushParseAndPop(
+      {}, ol.format.WMSCapabilities.FORMAT_ONLINERESOURCE_PARSERS_,
+      node, objectStack);
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Request object.
+ */
+ol.format.WMSCapabilities.readRequest_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Request',
+      'localName should be Request');
+  return ol.xml.pushParseAndPop(
+      {}, ol.format.WMSCapabilities.REQUEST_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} DCP type object.
+ */
+ol.format.WMSCapabilities.readDCPType_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'DCPType',
+      'localName should be DCPType');
+  return ol.xml.pushParseAndPop(
+      {}, ol.format.WMSCapabilities.DCPTYPE_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} HTTP object.
+ */
+ol.format.WMSCapabilities.readHTTP_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'HTTP', 'localName should be HTTP');
+  return ol.xml.pushParseAndPop(
+      {}, ol.format.WMSCapabilities.HTTP_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Operation type object.
+ */
+ol.format.WMSCapabilities.readOperationType_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  return ol.xml.pushParseAndPop(
+      {}, ol.format.WMSCapabilities.OPERATIONTYPE_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Online resource object.
+ */
+ol.format.WMSCapabilities.readSizedFormatOnlineresource_ =
+    function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  var formatOnlineresource =
+      ol.format.WMSCapabilities.readFormatOnlineresource_(node, objectStack);
+  if (formatOnlineresource) {
+    var size = [
+      ol.format.XSD.readNonNegativeIntegerString(node.getAttribute('width')),
+      ol.format.XSD.readNonNegativeIntegerString(node.getAttribute('height'))
+    ];
+    formatOnlineresource['size'] = size;
+    return formatOnlineresource;
+  }
+  return undefined;
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Authority URL object.
+ */
+ol.format.WMSCapabilities.readAuthorityURL_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'AuthorityURL',
+      'localName should be AuthorityURL');
+  var authorityObject =
+      ol.format.WMSCapabilities.readFormatOnlineresource_(node, objectStack);
+  if (authorityObject) {
+    authorityObject['name'] = node.getAttribute('name');
+    return authorityObject;
+  }
+  return undefined;
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Metadata URL object.
+ */
+ol.format.WMSCapabilities.readMetadataURL_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'MetadataURL',
+      'localName should be MetadataURL');
+  var metadataObject =
+      ol.format.WMSCapabilities.readFormatOnlineresource_(node, objectStack);
+  if (metadataObject) {
+    metadataObject['type'] = node.getAttribute('type');
+    return metadataObject;
+  }
+  return undefined;
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Style object.
+ */
+ol.format.WMSCapabilities.readStyle_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Style', 'localName should be Style');
+  return ol.xml.pushParseAndPop(
+      {}, ol.format.WMSCapabilities.STYLE_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Array.<string>|undefined} Keyword list.
+ */
+ol.format.WMSCapabilities.readKeywordList_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'KeywordList',
+      'localName should be KeywordList');
+  return ol.xml.pushParseAndPop(
+      [], ol.format.WMSCapabilities.KEYWORDLIST_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @const
+ * @private
+ * @type {Array.<string>}
+ */
+ol.format.WMSCapabilities.NAMESPACE_URIS_ = [
+  null,
+  'http://www.opengis.net/wms'
+];
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMSCapabilities.PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
+      'Service': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readService_),
+      'Capability': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readCapability_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMSCapabilities.CAPABILITY_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
+      'Request': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readRequest_),
+      'Exception': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readException_),
+      'Layer': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readCapabilityLayer_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMSCapabilities.SERVICE_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
+      'Name': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'Title': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'Abstract': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'KeywordList': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readKeywordList_),
+      'OnlineResource': ol.xml.makeObjectPropertySetter(
+          ol.format.XLink.readHref),
+      'ContactInformation': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readContactInformation_),
+      'Fees': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'AccessConstraints': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString),
+      'LayerLimit': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readNonNegativeInteger),
+      'MaxWidth': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readNonNegativeInteger),
+      'MaxHeight': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readNonNegativeInteger)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMSCapabilities.CONTACT_INFORMATION_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
+      'ContactPersonPrimary': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readContactPersonPrimary_),
+      'ContactPosition': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString),
+      'ContactAddress': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readContactAddress_),
+      'ContactVoiceTelephone': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString),
+      'ContactFacsimileTelephone': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString),
+      'ContactElectronicMailAddress': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMSCapabilities.CONTACT_PERSON_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
+      'ContactPerson': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString),
+      'ContactOrganization': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMSCapabilities.CONTACT_ADDRESS_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
+      'AddressType': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'Address': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'City': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'StateOrProvince': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString),
+      'PostCode': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'Country': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMSCapabilities.EXCEPTION_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
+      'Format': ol.xml.makeArrayPusher(ol.format.XSD.readString)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMSCapabilities.LAYER_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
+      'Name': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'Title': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'Abstract': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'KeywordList': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readKeywordList_),
+      'CRS': ol.xml.makeObjectPropertyPusher(ol.format.XSD.readString),
+      'EX_GeographicBoundingBox': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readEXGeographicBoundingBox_),
+      'BoundingBox': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMSCapabilities.readBoundingBox_),
+      'Dimension': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMSCapabilities.readDimension_),
+      'Attribution': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readAttribution_),
+      'AuthorityURL': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMSCapabilities.readAuthorityURL_),
+      'Identifier': ol.xml.makeObjectPropertyPusher(ol.format.XSD.readString),
+      'MetadataURL': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMSCapabilities.readMetadataURL_),
+      'DataURL': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMSCapabilities.readFormatOnlineresource_),
+      'FeatureListURL': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMSCapabilities.readFormatOnlineresource_),
+      'Style': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMSCapabilities.readStyle_),
+      'MinScaleDenominator': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readDecimal),
+      'MaxScaleDenominator': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readDecimal),
+      'Layer': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMSCapabilities.readLayer_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMSCapabilities.ATTRIBUTION_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
+      'Title': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'OnlineResource': ol.xml.makeObjectPropertySetter(
+          ol.format.XLink.readHref),
+      'LogoURL': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readSizedFormatOnlineresource_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMSCapabilities.EX_GEOGRAPHIC_BOUNDING_BOX_PARSERS_ =
+    ol.xml.makeStructureNS(ol.format.WMSCapabilities.NAMESPACE_URIS_, {
+      'westBoundLongitude': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readDecimal),
+      'eastBoundLongitude': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readDecimal),
+      'southBoundLatitude': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readDecimal),
+      'northBoundLatitude': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readDecimal)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMSCapabilities.REQUEST_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
+      'GetCapabilities': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readOperationType_),
+      'GetMap': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readOperationType_),
+      'GetFeatureInfo': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readOperationType_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMSCapabilities.OPERATIONTYPE_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
+      'Format': ol.xml.makeObjectPropertyPusher(ol.format.XSD.readString),
+      'DCPType': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMSCapabilities.readDCPType_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMSCapabilities.DCPTYPE_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
+      'HTTP': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readHTTP_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMSCapabilities.HTTP_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
+      'Get': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readFormatOnlineresource_),
+      'Post': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readFormatOnlineresource_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMSCapabilities.STYLE_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
+      'Name': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'Title': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'Abstract': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'LegendURL': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMSCapabilities.readSizedFormatOnlineresource_),
+      'StyleSheetURL': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readFormatOnlineresource_),
+      'StyleURL': ol.xml.makeObjectPropertySetter(
+          ol.format.WMSCapabilities.readFormatOnlineresource_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMSCapabilities.FORMAT_ONLINERESOURCE_PARSERS_ =
+    ol.xml.makeStructureNS(ol.format.WMSCapabilities.NAMESPACE_URIS_, {
+      'Format': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
+      'OnlineResource': ol.xml.makeObjectPropertySetter(
+          ol.format.XLink.readHref)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMSCapabilities.KEYWORDLIST_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
+      'Keyword': ol.xml.makeArrayPusher(ol.format.XSD.readString)
+    });
+
+goog.provide('ol.format.WMSGetFeatureInfo');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.dom.NodeType');
+goog.require('goog.object');
+goog.require('ol.format.GML2');
+goog.require('ol.format.XMLFeature');
+goog.require('ol.xml');
+
+
+
+/**
+ * @classdesc
+ * Format for reading WMSGetFeatureInfo format. It uses
+ * {@link ol.format.GML2} to read features.
+ *
+ * @constructor
+ * @extends {ol.format.XMLFeature}
+ * @api
+ */
+ol.format.WMSGetFeatureInfo = function() {
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.featureNS_ = 'http://mapserver.gis.umn.edu/mapserver';
+
+
+  /**
+   * @private
+   * @type {ol.format.GML2}
+   */
+  this.gmlFormat_ = new ol.format.GML2();
+
+  goog.base(this);
+};
+goog.inherits(ol.format.WMSGetFeatureInfo, ol.format.XMLFeature);
+
+
+/**
+ * @const
+ * @type {string}
+ * @private
+ */
+ol.format.WMSGetFeatureInfo.featureIdentifier_ = '_feature';
+
+
+/**
+ * @const
+ * @type {string}
+ * @private
+ */
+ol.format.WMSGetFeatureInfo.layerIdentifier_ = '_layer';
+
+
+/**
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Array.<ol.Feature>} Features.
+ * @private
+ */
+ol.format.WMSGetFeatureInfo.prototype.readFeatures_ =
+    function(node, objectStack) {
+
+  node.namespaceURI = this.featureNS_;
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  var localName = ol.xml.getLocalName(node);
+  /** @type {Array.<ol.Feature>} */
+  var features = [];
+  if (node.childNodes.length === 0) {
+    return features;
+  }
+  if (localName == 'msGMLOutput') {
+    for (var i = 0, ii = node.childNodes.length; i < ii; i++) {
+      var layer = node.childNodes[i];
+      if (layer.nodeType !== goog.dom.NodeType.ELEMENT) {
+        continue;
+      }
+      var context = objectStack[0];
+      goog.asserts.assert(goog.isObject(context),
+          'context should be an Object');
+
+      goog.asserts.assert(layer.localName.indexOf(
+          ol.format.WMSGetFeatureInfo.layerIdentifier_) >= 0,
+          'localName of layer node should match layerIdentifier');
+
+      var toRemove = ol.format.WMSGetFeatureInfo.layerIdentifier_;
+      var featureType = layer.localName.replace(toRemove, '') +
+          ol.format.WMSGetFeatureInfo.featureIdentifier_;
+
+      context['featureType'] = featureType;
+      context['featureNS'] = this.featureNS_;
+
+      var parsers = {};
+      parsers[featureType] = ol.xml.makeArrayPusher(
+          this.gmlFormat_.readFeatureElement, this.gmlFormat_);
+      var parsersNS = ol.xml.makeStructureNS(
+          [context['featureNS'], null], parsers);
+      layer.namespaceURI = this.featureNS_;
+      var layerFeatures = ol.xml.pushParseAndPop(
+          [], parsersNS, layer, objectStack, this.gmlFormat_);
+      if (layerFeatures) {
+        goog.array.extend(features, layerFeatures);
+      }
+    }
+  }
+  if (localName == 'FeatureCollection') {
+    var gmlFeatures = ol.xml.pushParseAndPop([],
+        this.gmlFormat_.FEATURE_COLLECTION_PARSERS, node,
+        [{}], this.gmlFormat_);
+    if (gmlFeatures) {
+      features = gmlFeatures;
+    }
+  }
+  return features;
+};
+
+
+/**
+ * Read all features from a WMSGetFeatureInfo response.
+ *
+ * @function
+ * @param {Document|Node|Object|string} source Source.
+ * @param {olx.format.ReadOptions=} opt_options Options.
+ * @return {Array.<ol.Feature>} Features.
+ * @api stable
+ */
+ol.format.WMSGetFeatureInfo.prototype.readFeatures;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.WMSGetFeatureInfo.prototype.readFeaturesFromNode =
+    function(node, opt_options) {
+  var options = {
+    'featureType': this.featureType,
+    'featureNS': this.featureNS
+  };
+  if (opt_options) {
+    goog.object.extend(options, this.getReadOptions(node, opt_options));
+  }
+  return this.readFeatures_(node, [options]);
+};
+
+goog.provide('ol.format.WMTSCapabilities');
+
+goog.require('goog.asserts');
+goog.require('goog.dom.NodeType');
+goog.require('ol.extent');
+goog.require('ol.format.OWS');
+goog.require('ol.format.XLink');
+goog.require('ol.format.XML');
+goog.require('ol.format.XSD');
+goog.require('ol.xml');
+
+
+
+/**
+ * @classdesc
+ * Format for reading WMTS capabilities data.
+ *
+ * @constructor
+ * @extends {ol.format.XML}
+ * @api
+ */
+ol.format.WMTSCapabilities = function() {
+  goog.base(this);
+
+  /**
+   * @type {ol.format.OWS}
+   * @private
+   */
+  this.owsParser_ = new ol.format.OWS();
+};
+goog.inherits(ol.format.WMTSCapabilities, ol.format.XML);
+
+
+/**
+ * Read a WMTS capabilities document.
+ *
+ * @function
+ * @param {Document|Node|string} source The XML source.
+ * @return {Object} An object representing the WMTS capabilities.
+ * @api
+ */
+ol.format.WMTSCapabilities.prototype.read;
+
+
+/**
+ * @param {Document} doc Document.
+ * @return {Object} WMTS Capability object.
+ */
+ol.format.WMTSCapabilities.prototype.readFromDocument = function(doc) {
+  goog.asserts.assert(doc.nodeType == goog.dom.NodeType.DOCUMENT,
+      'doc.nodeType should be DOCUMENT');
+  for (var n = doc.firstChild; n; n = n.nextSibling) {
+    if (n.nodeType == goog.dom.NodeType.ELEMENT) {
+      return this.readFromNode(n);
+    }
+  }
+  return null;
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @return {Object} WMTS Capability object.
+ */
+ol.format.WMTSCapabilities.prototype.readFromNode = function(node) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Capabilities',
+      'localName should be Capabilities');
+  this.version = node.getAttribute('version').trim();
+  goog.asserts.assertString(this.version, 'this.version should be a string');
+  var WMTSCapabilityObject = this.owsParser_.readFromNode(node);
+  if (!WMTSCapabilityObject) {
+    return null;
+  }
+  WMTSCapabilityObject['version'] = this.version;
+  WMTSCapabilityObject = ol.xml.pushParseAndPop(WMTSCapabilityObject,
+      ol.format.WMTSCapabilities.PARSERS_, node, []);
+  return WMTSCapabilityObject ? WMTSCapabilityObject : null;
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Attribution object.
+ */
+ol.format.WMTSCapabilities.readContents_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Contents',
+      'localName should be Contents');
+
+  return ol.xml.pushParseAndPop({},
+      ol.format.WMTSCapabilities.CONTENTS_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Layers object.
+ */
+ol.format.WMTSCapabilities.readLayer_ = function(node, objectStack) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT,
+      'node.nodeType should be ELEMENT');
+  goog.asserts.assert(node.localName == 'Layer', 'localName should be Layer');
+  return ol.xml.pushParseAndPop({},
+      ol.format.WMTSCapabilities.LAYER_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Tile Matrix Set object.
+ */
+ol.format.WMTSCapabilities.readTileMatrixSet_ = function(node, objectStack) {
+  return ol.xml.pushParseAndPop({},
+      ol.format.WMTSCapabilities.TMS_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Style object.
+ */
+ol.format.WMTSCapabilities.readStyle_ = function(node, objectStack) {
+  var style = ol.xml.pushParseAndPop({},
+      ol.format.WMTSCapabilities.STYLE_PARSERS_, node, objectStack);
+  if (!style) {
+    return undefined;
+  }
+  var isDefault = node.getAttribute('isDefault') === 'true';
+  style['isDefault'] = isDefault;
+  return style;
+
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Tile Matrix Set Link object.
+ */
+ol.format.WMTSCapabilities.readTileMatrixSetLink_ = function(node,
+    objectStack) {
+  return ol.xml.pushParseAndPop({},
+      ol.format.WMTSCapabilities.TMS_LINKS_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Dimension object.
+ */
+ol.format.WMTSCapabilities.readDimensions_ = function(node, objectStack) {
+  return ol.xml.pushParseAndPop({},
+      ol.format.WMTSCapabilities.DIMENSION_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Resource URL object.
+ */
+ol.format.WMTSCapabilities.readResourceUrl_ = function(node, objectStack) {
+  var format = node.getAttribute('format');
+  var template = node.getAttribute('template');
+  var resourceType = node.getAttribute('resourceType');
+  var resource = {};
+  if (format) {
+    resource['format'] = format;
+  }
+  if (template) {
+    resource['template'] = template;
+  }
+  if (resourceType) {
+    resource['resourceType'] = resourceType;
+  }
+  return resource;
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} WGS84 BBox object.
+ */
+ol.format.WMTSCapabilities.readWgs84BoundingBox_ = function(node, objectStack) {
+  var coordinates = ol.xml.pushParseAndPop([],
+      ol.format.WMTSCapabilities.WGS84_BBOX_READERS_, node, objectStack);
+  if (coordinates.length != 2) {
+    return undefined;
+  }
+  return ol.extent.boundingExtent(coordinates);
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Legend object.
+ */
+ol.format.WMTSCapabilities.readLegendUrl_ = function(node, objectStack) {
+  var legend = {};
+  legend['format'] = node.getAttribute('format');
+  legend['href'] = ol.format.XLink.readHref(node);
+  return legend;
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} Coordinates object.
+ */
+ol.format.WMTSCapabilities.readCoordinates_ = function(node, objectStack) {
+  var coordinates = ol.format.XSD.readString(node).split(' ');
+  if (!coordinates || coordinates.length != 2) {
+    return undefined;
+  }
+  var x = +coordinates[0];
+  var y = +coordinates[1];
+  if (isNaN(x) || isNaN(y)) {
+    return undefined;
+  }
+  return [x, y];
+};
+
+
+/**
+ * @private
+ * @param {Node} node Node.
+ * @param {Array.<*>} objectStack Object stack.
+ * @return {Object|undefined} TileMatrix object.
+ */
+ol.format.WMTSCapabilities.readTileMatrix_ = function(node, objectStack) {
+  return ol.xml.pushParseAndPop({},
+      ol.format.WMTSCapabilities.TM_PARSERS_, node, objectStack);
+};
+
+
+/**
+ * @const
+ * @private
+ * @type {Array.<string>}
+ */
+ol.format.WMTSCapabilities.NAMESPACE_URIS_ = [
+  null,
+  'http://www.opengis.net/wmts/1.0'
+];
+
+
+/**
+ * @const
+ * @private
+ * @type {Array.<string>}
+ */
+ol.format.WMTSCapabilities.OWS_NAMESPACE_URIS_ = [
+  null,
+  'http://www.opengis.net/ows/1.1'
+];
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMTSCapabilities.PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMTSCapabilities.NAMESPACE_URIS_, {
+      'Contents': ol.xml.makeObjectPropertySetter(
+          ol.format.WMTSCapabilities.readContents_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMTSCapabilities.CONTENTS_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMTSCapabilities.NAMESPACE_URIS_, {
+      'Layer': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMTSCapabilities.readLayer_),
+      'TileMatrixSet': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMTSCapabilities.readTileMatrixSet_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMTSCapabilities.LAYER_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMTSCapabilities.NAMESPACE_URIS_, {
+      'Style': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMTSCapabilities.readStyle_),
+      'Format': ol.xml.makeObjectPropertyPusher(
+          ol.format.XSD.readString),
+      'TileMatrixSetLink': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMTSCapabilities.readTileMatrixSetLink_),
+      'Dimension': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMTSCapabilities.readDimensions_),
+      'ResourceURL': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMTSCapabilities.readResourceUrl_)
+    }, ol.xml.makeStructureNS(ol.format.WMTSCapabilities.OWS_NAMESPACE_URIS_, {
+      'Title': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString),
+      'Abstract': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString),
+      'WGS84BoundingBox': ol.xml.makeObjectPropertySetter(
+          ol.format.WMTSCapabilities.readWgs84BoundingBox_),
+      'Identifier': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString)
+    }));
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMTSCapabilities.STYLE_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMTSCapabilities.NAMESPACE_URIS_, {
+      'LegendURL': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMTSCapabilities.readLegendUrl_)
+    }, ol.xml.makeStructureNS(ol.format.WMTSCapabilities.OWS_NAMESPACE_URIS_, {
+      'Title': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString),
+      'Identifier': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString)
+    }));
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMTSCapabilities.TMS_LINKS_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMTSCapabilities.NAMESPACE_URIS_, {
+      'TileMatrixSet': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMTSCapabilities.DIMENSION_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMTSCapabilities.NAMESPACE_URIS_, {
+      'Default': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString),
+      'Value': ol.xml.makeObjectPropertyPusher(
+          ol.format.XSD.readString)
+    }, ol.xml.makeStructureNS(ol.format.WMTSCapabilities.OWS_NAMESPACE_URIS_, {
+      'Identifier': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString)
+    }));
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMTSCapabilities.WGS84_BBOX_READERS_ = ol.xml.makeStructureNS(
+    ol.format.WMTSCapabilities.OWS_NAMESPACE_URIS_, {
+      'LowerCorner': ol.xml.makeArrayPusher(
+          ol.format.WMTSCapabilities.readCoordinates_),
+      'UpperCorner': ol.xml.makeArrayPusher(
+          ol.format.WMTSCapabilities.readCoordinates_)
+    });
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMTSCapabilities.TMS_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMTSCapabilities.NAMESPACE_URIS_, {
+      'WellKnownScaleSet': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString),
+      'TileMatrix': ol.xml.makeObjectPropertyPusher(
+          ol.format.WMTSCapabilities.readTileMatrix_)
+    }, ol.xml.makeStructureNS(ol.format.WMTSCapabilities.OWS_NAMESPACE_URIS_, {
+      'SupportedCRS': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString),
+      'Identifier': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString)
+    }));
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WMTSCapabilities.TM_PARSERS_ = ol.xml.makeStructureNS(
+    ol.format.WMTSCapabilities.NAMESPACE_URIS_, {
+      'TopLeftCorner': ol.xml.makeObjectPropertySetter(
+          ol.format.WMTSCapabilities.readCoordinates_),
+      'ScaleDenominator': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readDecimal),
+      'TileWidth': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readNonNegativeInteger),
+      'TileHeight': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readNonNegativeInteger),
+      'MatrixWidth': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readNonNegativeInteger),
+      'MatrixHeight': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readNonNegativeInteger)
+    }, ol.xml.makeStructureNS(ol.format.WMTSCapabilities.OWS_NAMESPACE_URIS_, {
+      'Identifier': ol.xml.makeObjectPropertySetter(
+          ol.format.XSD.readString)
+    }));
+
+goog.provide('ol.sphere.WGS84');
+
+goog.require('ol.Sphere');
+
+
+/**
+ * A sphere with radius equal to the semi-major axis of the WGS84 ellipsoid.
+ * @const
+ * @type {ol.Sphere}
+ */
+ol.sphere.WGS84 = new ol.Sphere(6378137);
+
+// FIXME handle geolocation not supported
+
+goog.provide('ol.Geolocation');
+goog.provide('ol.GeolocationProperty');
+
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('ol.Coordinate');
+goog.require('ol.Object');
+goog.require('ol.geom.Geometry');
+goog.require('ol.geom.Polygon');
+goog.require('ol.has');
+goog.require('ol.math');
+goog.require('ol.proj');
+goog.require('ol.sphere.WGS84');
+
+
+/**
+ * @enum {string}
+ */
+ol.GeolocationProperty = {
+  ACCURACY: 'accuracy',
+  ACCURACY_GEOMETRY: 'accuracyGeometry',
+  ALTITUDE: 'altitude',
+  ALTITUDE_ACCURACY: 'altitudeAccuracy',
+  HEADING: 'heading',
+  POSITION: 'position',
+  PROJECTION: 'projection',
+  SPEED: 'speed',
+  TRACKING: 'tracking',
+  TRACKING_OPTIONS: 'trackingOptions'
+};
+
+
+
+/**
+ * @classdesc
+ * Helper class for providing HTML5 Geolocation capabilities.
+ * The [Geolocation API](http://www.w3.org/TR/geolocation-API/)
+ * is used to locate a user's position.
+ *
+ * To get notified of position changes, register a listener for the generic
+ * `change` event on your instance of `ol.Geolocation`.
+ *
+ * Example:
+ *
+ *     var geolocation = new ol.Geolocation({
+ *       // take the projection to use from the map's view
+ *       projection: view.getProjection()
+ *     });
+ *     // listen to changes in position
+ *     geolocation.on('change', function(evt) {
+ *       window.console.log(geolocation.getPosition());
+ *     });
+ *
+ * @constructor
+ * @extends {ol.Object}
+ * @param {olx.GeolocationOptions=} opt_options Options.
+ * @api stable
+ */
+ol.Geolocation = function(opt_options) {
+
+  goog.base(this);
+
+  var options = opt_options || {};
+
+  /**
+   * The unprojected (EPSG:4326) device position.
+   * @private
+   * @type {ol.Coordinate}
+   */
+  this.position_ = null;
+
+  /**
+   * @private
+   * @type {ol.TransformFunction}
+   */
+  this.transform_ = ol.proj.identityTransform;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.watchId_ = undefined;
+
+  goog.events.listen(
+      this, ol.Object.getChangeEventType(ol.GeolocationProperty.PROJECTION),
+      this.handleProjectionChanged_, false, this);
+  goog.events.listen(
+      this, ol.Object.getChangeEventType(ol.GeolocationProperty.TRACKING),
+      this.handleTrackingChanged_, false, this);
+
+  if (options.projection !== undefined) {
+    this.setProjection(ol.proj.get(options.projection));
+  }
+  if (options.trackingOptions !== undefined) {
+    this.setTrackingOptions(options.trackingOptions);
+  }
+
+  this.setTracking(options.tracking !== undefined ? options.tracking : false);
+
+};
+goog.inherits(ol.Geolocation, ol.Object);
+
+
+/**
+ * @inheritDoc
+ */
+ol.Geolocation.prototype.disposeInternal = function() {
+  this.setTracking(false);
+  goog.base(this, 'disposeInternal');
+};
+
+
+/**
+ * @private
+ */
+ol.Geolocation.prototype.handleProjectionChanged_ = function() {
+  var projection = this.getProjection();
+  if (projection) {
+    this.transform_ = ol.proj.getTransformFromProjections(
+        ol.proj.get('EPSG:4326'), projection);
+    if (this.position_) {
+      this.set(
+          ol.GeolocationProperty.POSITION, this.transform_(this.position_));
+    }
+  }
+};
+
+
+/**
+ * @private
+ */
+ol.Geolocation.prototype.handleTrackingChanged_ = function() {
+  if (ol.has.GEOLOCATION) {
+    var tracking = this.getTracking();
+    if (tracking && this.watchId_ === undefined) {
+      this.watchId_ = goog.global.navigator.geolocation.watchPosition(
+          goog.bind(this.positionChange_, this),
+          goog.bind(this.positionError_, this),
+          this.getTrackingOptions());
+    } else if (!tracking && this.watchId_ !== undefined) {
+      goog.global.navigator.geolocation.clearWatch(this.watchId_);
+      this.watchId_ = undefined;
+    }
+  }
+};
+
+
+/**
+ * @private
+ * @param {GeolocationPosition} position position event.
+ */
+ol.Geolocation.prototype.positionChange_ = function(position) {
+  var coords = position.coords;
+  this.set(ol.GeolocationProperty.ACCURACY, coords.accuracy);
+  this.set(ol.GeolocationProperty.ALTITUDE,
+      coords.altitude === null ? undefined : coords.altitude);
+  this.set(ol.GeolocationProperty.ALTITUDE_ACCURACY,
+      coords.altitudeAccuracy === null ?
+      undefined : coords.altitudeAccuracy);
+  this.set(ol.GeolocationProperty.HEADING, coords.heading === null ?
+      undefined : ol.math.toRadians(coords.heading));
+  if (!this.position_) {
+    this.position_ = [coords.longitude, coords.latitude];
+  } else {
+    this.position_[0] = coords.longitude;
+    this.position_[1] = coords.latitude;
+  }
+  var projectedPosition = this.transform_(this.position_);
+  this.set(ol.GeolocationProperty.POSITION, projectedPosition);
+  this.set(ol.GeolocationProperty.SPEED,
+      coords.speed === null ? undefined : coords.speed);
+  var geometry = ol.geom.Polygon.circular(
+      ol.sphere.WGS84, this.position_, coords.accuracy);
+  geometry.applyTransform(this.transform_);
+  this.set(ol.GeolocationProperty.ACCURACY_GEOMETRY, geometry);
+  this.changed();
+};
+
+
+/**
+ * @private
+ * @param {GeolocationPositionError} error error object.
+ */
+ol.Geolocation.prototype.positionError_ = function(error) {
+  error.type = goog.events.EventType.ERROR;
+  this.setTracking(false);
+  this.dispatchEvent(error);
+};
+
+
+/**
+ * Get the accuracy of the position in meters.
+ * @return {number|undefined} The accuracy of the position measurement in
+ *     meters.
+ * @observable
+ * @api stable
+ */
+ol.Geolocation.prototype.getAccuracy = function() {
+  return /** @type {number|undefined} */ (
+      this.get(ol.GeolocationProperty.ACCURACY));
+};
+
+
+/**
+ * Get a geometry of the position accuracy.
+ * @return {?ol.geom.Geometry} A geometry of the position accuracy.
+ * @observable
+ * @api stable
+ */
+ol.Geolocation.prototype.getAccuracyGeometry = function() {
+  return /** @type {?ol.geom.Geometry} */ (
+      this.get(ol.GeolocationProperty.ACCURACY_GEOMETRY) || null);
+};
+
+
+/**
+ * Get the altitude associated with the position.
+ * @return {number|undefined} The altitude of the position in meters above mean
+ *     sea level.
+ * @observable
+ * @api stable
+ */
+ol.Geolocation.prototype.getAltitude = function() {
+  return /** @type {number|undefined} */ (
+      this.get(ol.GeolocationProperty.ALTITUDE));
+};
+
+
+/**
+ * Get the altitude accuracy of the position.
+ * @return {number|undefined} The accuracy of the altitude measurement in
+ *     meters.
+ * @observable
+ * @api stable
+ */
+ol.Geolocation.prototype.getAltitudeAccuracy = function() {
+  return /** @type {number|undefined} */ (
+      this.get(ol.GeolocationProperty.ALTITUDE_ACCURACY));
+};
+
+
+/**
+ * Get the heading as radians clockwise from North.
+ * @return {number|undefined} The heading of the device in radians from north.
+ * @observable
+ * @api stable
+ */
+ol.Geolocation.prototype.getHeading = function() {
+  return /** @type {number|undefined} */ (
+      this.get(ol.GeolocationProperty.HEADING));
+};
+
+
+/**
+ * Get the position of the device.
+ * @return {ol.Coordinate|undefined} The current position of the device reported
+ *     in the current projection.
+ * @observable
+ * @api stable
+ */
+ol.Geolocation.prototype.getPosition = function() {
+  return /** @type {ol.Coordinate|undefined} */ (
+      this.get(ol.GeolocationProperty.POSITION));
+};
+
+
+/**
+ * Get the projection associated with the position.
+ * @return {ol.proj.Projection|undefined} The projection the position is
+ *     reported in.
+ * @observable
+ * @api stable
+ */
+ol.Geolocation.prototype.getProjection = function() {
+  return /** @type {ol.proj.Projection|undefined} */ (
+      this.get(ol.GeolocationProperty.PROJECTION));
+};
+
+
+/**
+ * Get the speed in meters per second.
+ * @return {number|undefined} The instantaneous speed of the device in meters
+ *     per second.
+ * @observable
+ * @api stable
+ */
+ol.Geolocation.prototype.getSpeed = function() {
+  return /** @type {number|undefined} */ (
+      this.get(ol.GeolocationProperty.SPEED));
+};
+
+
+/**
+ * Determine if the device location is being tracked.
+ * @return {boolean} The device location is being tracked.
+ * @observable
+ * @api stable
+ */
+ol.Geolocation.prototype.getTracking = function() {
+  return /** @type {boolean} */ (
+      this.get(ol.GeolocationProperty.TRACKING));
+};
+
+
+/**
+ * Get the tracking options.
+ * @see http://www.w3.org/TR/geolocation-API/#position-options
+ * @return {GeolocationPositionOptions|undefined} PositionOptions as defined by
+ *     the [HTML5 Geolocation spec
+ *     ](http://www.w3.org/TR/geolocation-API/#position_options_interface).
+ * @observable
+ * @api stable
+ */
+ol.Geolocation.prototype.getTrackingOptions = function() {
+  return /** @type {GeolocationPositionOptions|undefined} */ (
+      this.get(ol.GeolocationProperty.TRACKING_OPTIONS));
+};
+
+
+/**
+ * Set the projection to use for transforming the coordinates.
+ * @param {ol.proj.Projection} projection The projection the position is
+ *     reported in.
+ * @observable
+ * @api stable
+ */
+ol.Geolocation.prototype.setProjection = function(projection) {
+  this.set(ol.GeolocationProperty.PROJECTION, projection);
+};
+
+
+/**
+ * Enable or disable tracking.
+ * @param {boolean} tracking Enable tracking.
+ * @observable
+ * @api stable
+ */
+ol.Geolocation.prototype.setTracking = function(tracking) {
+  this.set(ol.GeolocationProperty.TRACKING, tracking);
+};
+
+
+/**
+ * Set the tracking options.
+ * @see http://www.w3.org/TR/geolocation-API/#position-options
+ * @param {GeolocationPositionOptions} options PositionOptions as defined by the
+ *     [HTML5 Geolocation spec
+ *     ](http://www.w3.org/TR/geolocation-API/#position_options_interface).
+ * @observable
+ * @api stable
+ */
+ol.Geolocation.prototype.setTrackingOptions = function(options) {
+  this.set(ol.GeolocationProperty.TRACKING_OPTIONS, options);
+};
+
+goog.provide('ol.geom.Circle');
+
+goog.require('goog.asserts');
+goog.require('ol.extent');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.GeometryType');
+goog.require('ol.geom.SimpleGeometry');
+goog.require('ol.geom.flat.deflate');
+goog.require('ol.proj');
+
+
+
+/**
+ * @classdesc
+ * Circle geometry.
+ *
+ * @constructor
+ * @extends {ol.geom.SimpleGeometry}
+ * @param {ol.Coordinate} center Center.
+ * @param {number=} opt_radius Radius.
+ * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @api
+ */
+ol.geom.Circle = function(center, opt_radius, opt_layout) {
+  goog.base(this);
+  var radius = opt_radius ? opt_radius : 0;
+  this.setCenterAndRadius(center, radius, opt_layout);
+};
+goog.inherits(ol.geom.Circle, ol.geom.SimpleGeometry);
+
+
+/**
+ * Make a complete copy of the geometry.
+ * @return {!ol.geom.Circle} Clone.
+ * @api
+ */
+ol.geom.Circle.prototype.clone = function() {
+  var circle = new ol.geom.Circle(null);
+  circle.setFlatCoordinates(this.layout, this.flatCoordinates.slice());
+  return circle;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.Circle.prototype.closestPointXY =
+    function(x, y, closestPoint, minSquaredDistance) {
+  var flatCoordinates = this.flatCoordinates;
+  var dx = x - flatCoordinates[0];
+  var dy = y - flatCoordinates[1];
+  var squaredDistance = dx * dx + dy * dy;
+  if (squaredDistance < minSquaredDistance) {
+    var i;
+    if (squaredDistance === 0) {
+      for (i = 0; i < this.stride; ++i) {
+        closestPoint[i] = flatCoordinates[i];
+      }
+    } else {
+      var delta = this.getRadius() / Math.sqrt(squaredDistance);
+      closestPoint[0] = flatCoordinates[0] + delta * dx;
+      closestPoint[1] = flatCoordinates[1] + delta * dy;
+      for (i = 2; i < this.stride; ++i) {
+        closestPoint[i] = flatCoordinates[i];
+      }
+    }
+    closestPoint.length = this.stride;
+    return squaredDistance;
+  } else {
+    return minSquaredDistance;
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.Circle.prototype.containsXY = function(x, y) {
+  var flatCoordinates = this.flatCoordinates;
+  var dx = x - flatCoordinates[0];
+  var dy = y - flatCoordinates[1];
+  return dx * dx + dy * dy <= this.getRadiusSquared_();
+};
+
+
+/**
+ * Return the center of the circle as {@link ol.Coordinate coordinate}.
+ * @return {ol.Coordinate} Center.
+ * @api
+ */
+ol.geom.Circle.prototype.getCenter = function() {
+  return this.flatCoordinates.slice(0, this.stride);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.Circle.prototype.computeExtent = function(extent) {
+  var flatCoordinates = this.flatCoordinates;
+  var radius = flatCoordinates[this.stride] - flatCoordinates[0];
+  return ol.extent.createOrUpdate(
+      flatCoordinates[0] - radius, flatCoordinates[1] - radius,
+      flatCoordinates[0] + radius, flatCoordinates[1] + radius,
+      extent);
+};
+
+
+/**
+ * Return the radius of the circle.
+ * @return {number} Radius.
+ * @api
+ */
+ol.geom.Circle.prototype.getRadius = function() {
+  return Math.sqrt(this.getRadiusSquared_());
+};
+
+
+/**
+ * @private
+ * @return {number} Radius squared.
+ */
+ol.geom.Circle.prototype.getRadiusSquared_ = function() {
+  var dx = this.flatCoordinates[this.stride] - this.flatCoordinates[0];
+  var dy = this.flatCoordinates[this.stride + 1] - this.flatCoordinates[1];
+  return dx * dx + dy * dy;
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.geom.Circle.prototype.getType = function() {
+  return ol.geom.GeometryType.CIRCLE;
+};
+
+
+/**
+ * @inheritDoc
+ * @api stable
+ */
+ol.geom.Circle.prototype.intersectsExtent = function(extent) {
+  var circleExtent = this.getExtent();
+  if (ol.extent.intersects(extent, circleExtent)) {
+    var center = this.getCenter();
+
+    if (extent[0] <= center[0] && extent[2] >= center[0]) {
+      return true;
+    }
+    if (extent[1] <= center[1] && extent[3] >= center[1]) {
+      return true;
+    }
+
+    return ol.extent.forEachCorner(extent, this.containsCoordinate, this);
+  }
+  return false;
+
+};
+
+
+/**
+ * Set the center of the circle as {@link ol.Coordinate coordinate}.
+ * @param {ol.Coordinate} center Center.
+ * @api
+ */
+ol.geom.Circle.prototype.setCenter = function(center) {
+  var stride = this.stride;
+  goog.asserts.assert(center.length == stride,
+      'center array length should match stride');
+  var radius = this.flatCoordinates[stride] - this.flatCoordinates[0];
+  var flatCoordinates = center.slice();
+  flatCoordinates[stride] = flatCoordinates[0] + radius;
+  var i;
+  for (i = 1; i < stride; ++i) {
+    flatCoordinates[stride + i] = center[i];
+  }
+  this.setFlatCoordinates(this.layout, flatCoordinates);
+};
+
+
+/**
+ * Set the center (as {@link ol.Coordinate coordinate}) and the radius (as
+ * number) of the circle.
+ * @param {ol.Coordinate} center Center.
+ * @param {number} radius Radius.
+ * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @api
+ */
+ol.geom.Circle.prototype.setCenterAndRadius =
+    function(center, radius, opt_layout) {
+  if (!center) {
+    this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null);
+  } else {
+    this.setLayout(opt_layout, center, 0);
+    if (!this.flatCoordinates) {
+      this.flatCoordinates = [];
+    }
+    /** @type {Array.<number>} */
+    var flatCoordinates = this.flatCoordinates;
+    var offset = ol.geom.flat.deflate.coordinate(
+        flatCoordinates, 0, center, this.stride);
+    flatCoordinates[offset++] = flatCoordinates[0] + radius;
+    var i, ii;
+    for (i = 1, ii = this.stride; i < ii; ++i) {
+      flatCoordinates[offset++] = flatCoordinates[i];
+    }
+    flatCoordinates.length = offset;
+    this.changed();
+  }
+};
+
+
+/**
+ * @param {ol.geom.GeometryLayout} layout Layout.
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ */
+ol.geom.Circle.prototype.setFlatCoordinates =
+    function(layout, flatCoordinates) {
+  this.setFlatCoordinatesInternal(layout, flatCoordinates);
+  this.changed();
+};
+
+
+/**
+ * Set the radius of the circle. The radius is in the units of the projection.
+ * @param {number} radius Radius.
+ * @api
+ */
+ol.geom.Circle.prototype.setRadius = function(radius) {
+  goog.asserts.assert(this.flatCoordinates,
+      'truthy this.flatCoordinates expected');
+  this.flatCoordinates[this.stride] = this.flatCoordinates[0] + radius;
+  this.changed();
+};
+
+
+/**
+ * Transform each coordinate of the circle from one coordinate reference system
+ * to another. The geometry is modified in place.
+ * If you do not want the geometry modified in place, first clone() it and
+ * then use this function on the clone.
+ *
+ * Internally a circle is currently represented by two points: the center of
+ * the circle `[cx, cy]`, and the point to the right of the circle
+ * `[cx + r, cy]`. This `transform` function just transforms these two points.
+ * So the resulting geometry is also a circle, and that circle does not
+ * correspond to the shape that would be obtained by transforming every point
+ * of the original circle.
+ *
+ * @param {ol.proj.ProjectionLike} source The current projection.  Can be a
+ *     string identifier or a {@link ol.proj.Projection} object.
+ * @param {ol.proj.ProjectionLike} destination The desired projection.  Can be a
+ *     string identifier or a {@link ol.proj.Projection} object.
+ * @return {ol.geom.Circle} This geometry.  Note that original geometry is
+ *     modified in place.
+ * @function
+ * @api stable
+ */
+ol.geom.Circle.prototype.transform;
+
+goog.provide('ol.geom.flat.geodesic');
+
+goog.require('goog.asserts');
+goog.require('ol.TransformFunction');
+goog.require('ol.math');
+goog.require('ol.proj');
+
+
+/**
+ * @private
+ * @param {function(number): ol.Coordinate} interpolate Interpolate function.
+ * @param {ol.TransformFunction} transform Transform from longitude/latitude to
+ *     projected coordinates.
+ * @param {number} squaredTolerance Squared tolerance.
+ * @return {Array.<number>} Flat coordinates.
+ */
+ol.geom.flat.geodesic.line_ =
+    function(interpolate, transform, squaredTolerance) {
+  // FIXME reduce garbage generation
+  // FIXME optimize stack operations
+
+  /** @type {Array.<number>} */
+  var flatCoordinates = [];
+
+  var geoA = interpolate(0);
+  var geoB = interpolate(1);
+
+  var a = transform(geoA);
+  var b = transform(geoB);
+
+  /** @type {Array.<ol.Coordinate>} */
+  var geoStack = [geoB, geoA];
+  /** @type {Array.<ol.Coordinate>} */
+  var stack = [b, a];
+  /** @type {Array.<number>} */
+  var fractionStack = [1, 0];
+
+  /** @type {Object.<string, boolean>} */
+  var fractions = {};
+
+  var maxIterations = 1e5;
+  var geoM, m, fracA, fracB, fracM, key;
+
+  while (--maxIterations > 0 && fractionStack.length > 0) {
+    // Pop the a coordinate off the stack
+    fracA = fractionStack.pop();
+    geoA = geoStack.pop();
+    a = stack.pop();
+    // Add the a coordinate if it has not been added yet
+    key = fracA.toString();
+    if (!(key in fractions)) {
+      flatCoordinates.push(a[0], a[1]);
+      fractions[key] = true;
+    }
+    // Pop the b coordinate off the stack
+    fracB = fractionStack.pop();
+    geoB = geoStack.pop();
+    b = stack.pop();
+    // Find the m point between the a and b coordinates
+    fracM = (fracA + fracB) / 2;
+    geoM = interpolate(fracM);
+    m = transform(geoM);
+    if (ol.math.squaredSegmentDistance(m[0], m[1], a[0], a[1],
+        b[0], b[1]) < squaredTolerance) {
+      // If the m point is sufficiently close to the straight line, then we
+      // discard it.  Just use the b coordinate and move on to the next line
+      // segment.
+      flatCoordinates.push(b[0], b[1]);
+      key = fracB.toString();
+      goog.asserts.assert(!(key in fractions),
+          'fractions object should contain key : ' + key);
+      fractions[key] = true;
+    } else {
+      // Otherwise, we need to subdivide the current line segment.  Split it
+      // into two and push the two line segments onto the stack.
+      fractionStack.push(fracB, fracM, fracM, fracA);
+      stack.push(b, m, m, a);
+      geoStack.push(geoB, geoM, geoM, geoA);
+    }
+  }
+  goog.asserts.assert(maxIterations > 0,
+      'maxIterations should be more than 0');
+
+  return flatCoordinates;
+};
+
+
+/**
+* Generate a great-circle arcs between two lat/lon points.
+* @param {number} lon1 Longitude 1 in degrees.
+* @param {number} lat1 Latitude 1 in degrees.
+* @param {number} lon2 Longitude 2 in degrees.
+* @param {number} lat2 Latitude 2 in degrees.
+ * @param {ol.proj.Projection} projection Projection.
+* @param {number} squaredTolerance Squared tolerance.
+* @return {Array.<number>} Flat coordinates.
+*/
+ol.geom.flat.geodesic.greatCircleArc = function(
+    lon1, lat1, lon2, lat2, projection, squaredTolerance) {
+
+  var geoProjection = ol.proj.get('EPSG:4326');
+
+  var cosLat1 = Math.cos(ol.math.toRadians(lat1));
+  var sinLat1 = Math.sin(ol.math.toRadians(lat1));
+  var cosLat2 = Math.cos(ol.math.toRadians(lat2));
+  var sinLat2 = Math.sin(ol.math.toRadians(lat2));
+  var cosDeltaLon = Math.cos(ol.math.toRadians(lon2 - lon1));
+  var sinDeltaLon = Math.sin(ol.math.toRadians(lon2 - lon1));
+  var d = sinLat1 * sinLat2 + cosLat1 * cosLat2 * cosDeltaLon;
+
+  return ol.geom.flat.geodesic.line_(
+      /**
+       * @param {number} frac Fraction.
+       * @return {ol.Coordinate} Coordinate.
+       */
+      function(frac) {
+        if (1 <= d) {
+          return [lon2, lat2];
+        }
+        var D = frac * Math.acos(d);
+        var cosD = Math.cos(D);
+        var sinD = Math.sin(D);
+        var y = sinDeltaLon * cosLat2;
+        var x = cosLat1 * sinLat2 - sinLat1 * cosLat2 * cosDeltaLon;
+        var theta = Math.atan2(y, x);
+        var lat = Math.asin(sinLat1 * cosD + cosLat1 * sinD * Math.cos(theta));
+        var lon = ol.math.toRadians(lon1) +
+            Math.atan2(Math.sin(theta) * sinD * cosLat1,
+                       cosD - sinLat1 * Math.sin(lat));
+        return [ol.math.toDegrees(lon), ol.math.toDegrees(lat)];
+      }, ol.proj.getTransform(geoProjection, projection), squaredTolerance);
+};
+
+
+/**
+ * Generate a meridian (line at constant longitude).
+ * @param {number} lon Longitude.
+ * @param {number} lat1 Latitude 1.
+ * @param {number} lat2 Latitude 2.
+ * @param {ol.proj.Projection} projection Projection.
+ * @param {number} squaredTolerance Squared tolerance.
+ * @return {Array.<number>} Flat coordinates.
+ */
+ol.geom.flat.geodesic.meridian =
+    function(lon, lat1, lat2, projection, squaredTolerance) {
+  var epsg4326Projection = ol.proj.get('EPSG:4326');
+  return ol.geom.flat.geodesic.line_(
+      /**
+       * @param {number} frac Fraction.
+       * @return {ol.Coordinate} Coordinate.
+       */
+      function(frac) {
+        return [lon, lat1 + ((lat2 - lat1) * frac)];
+      },
+      ol.proj.getTransform(epsg4326Projection, projection), squaredTolerance);
+};
+
+
+/**
+ * Generate a parallel (line at constant latitude).
+ * @param {number} lat Latitude.
+ * @param {number} lon1 Longitude 1.
+ * @param {number} lon2 Longitude 2.
+ * @param {ol.proj.Projection} projection Projection.
+ * @param {number} squaredTolerance Squared tolerance.
+ * @return {Array.<number>} Flat coordinates.
+ */
+ol.geom.flat.geodesic.parallel =
+    function(lat, lon1, lon2, projection, squaredTolerance) {
+  var epsg4326Projection = ol.proj.get('EPSG:4326');
+  return ol.geom.flat.geodesic.line_(
+      /**
+       * @param {number} frac Fraction.
+       * @return {ol.Coordinate} Coordinate.
+       */
+      function(frac) {
+        return [lon1 + ((lon2 - lon1) * frac), lat];
+      },
+      ol.proj.getTransform(epsg4326Projection, projection), squaredTolerance);
+};
+
+goog.provide('ol.Graticule');
+
+goog.require('goog.asserts');
+goog.require('ol.extent');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.flat.geodesic');
+goog.require('ol.math');
+goog.require('ol.proj');
+goog.require('ol.render.EventType');
+goog.require('ol.style.Stroke');
+
+
+
+/**
+ * Render a grid for a coordinate system on a map.
+ * @constructor
+ * @param {olx.GraticuleOptions=} opt_options Options.
+ * @api
+ */
+ol.Graticule = function(opt_options) {
+
+  var options = opt_options || {};
+
+  /**
+   * @type {ol.Map}
+   * @private
+   */
+  this.map_ = null;
+
+  /**
+   * @type {ol.proj.Projection}
+   * @private
+   */
+  this.projection_ = null;
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.maxLat_ = Infinity;
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.maxLon_ = Infinity;
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.minLat_ = -Infinity;
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.minLon_ = -Infinity;
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.maxLatP_ = Infinity;
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.maxLonP_ = Infinity;
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.minLatP_ = -Infinity;
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.minLonP_ = -Infinity;
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.targetSize_ = options.targetSize !== undefined ?
+      options.targetSize : 100;
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.maxLines_ = options.maxLines !== undefined ? options.maxLines : 100;
+  goog.asserts.assert(this.maxLines_ > 0,
+      'this.maxLines_ should be more than 0');
+
+  /**
+   * @type {Array.<ol.geom.LineString>}
+   * @private
+   */
+  this.meridians_ = [];
+
+  /**
+   * @type {Array.<ol.geom.LineString>}
+   * @private
+   */
+  this.parallels_ = [];
+
+  /**
+   * @type {ol.style.Stroke}
+   * @private
+   */
+  this.strokeStyle_ = options.strokeStyle !== undefined ?
+      options.strokeStyle : ol.Graticule.DEFAULT_STROKE_STYLE_;
+
+  /**
+   * @type {ol.TransformFunction|undefined}
+   * @private
+   */
+  this.fromLonLatTransform_ = undefined;
+
+  /**
+   * @type {ol.TransformFunction|undefined}
+   * @private
+   */
+  this.toLonLatTransform_ = undefined;
+
+  /**
+   * @type {ol.Coordinate}
+   * @private
+   */
+  this.projectionCenterLonLat_ = null;
+
+  this.setMap(options.map !== undefined ? options.map : null);
+};
+
+
+/**
+ * @type {ol.style.Stroke}
+ * @private
+ * @const
+ */
+ol.Graticule.DEFAULT_STROKE_STYLE_ = new ol.style.Stroke({
+  color: 'rgba(0,0,0,0.2)'
+});
+
+
+/**
+ * TODO can be configurable
+ * @type {Array.<number>}
+ * @private
+ */
+ol.Graticule.intervals_ = [90, 45, 30, 20, 10, 5, 2, 1, 0.5, 0.2, 0.1, 0.05,
+  0.01, 0.005, 0.002, 0.001];
+
+
+/**
+ * @param {number} lon Longitude.
+ * @param {number} minLat Minimal latitude.
+ * @param {number} maxLat Maximal latitude.
+ * @param {number} squaredTolerance Squared tolerance.
+ * @param {ol.Extent} extent Extent.
+ * @param {number} index Index.
+ * @return {number} Index.
+ * @private
+ */
+ol.Graticule.prototype.addMeridian_ =
+    function(lon, minLat, maxLat, squaredTolerance, extent, index) {
+  var lineString = this.getMeridian_(lon, minLat, maxLat,
+      squaredTolerance, index);
+  if (ol.extent.intersects(lineString.getExtent(), extent)) {
+    this.meridians_[index++] = lineString;
+  }
+  return index;
+};
+
+
+/**
+ * @param {number} lat Latitude.
+ * @param {number} minLon Minimal longitude.
+ * @param {number} maxLon Maximal longitude.
+ * @param {number} squaredTolerance Squared tolerance.
+ * @param {ol.Extent} extent Extent.
+ * @param {number} index Index.
+ * @return {number} Index.
+ * @private
+ */
+ol.Graticule.prototype.addParallel_ =
+    function(lat, minLon, maxLon, squaredTolerance, extent, index) {
+  var lineString = this.getParallel_(lat, minLon, maxLon, squaredTolerance,
+      index);
+  if (ol.extent.intersects(lineString.getExtent(), extent)) {
+    this.parallels_[index++] = lineString;
+  }
+  return index;
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {ol.Coordinate} center Center.
+ * @param {number} resolution Resolution.
+ * @param {number} squaredTolerance Squared tolerance.
+ * @private
+ */
+ol.Graticule.prototype.createGraticule_ =
+    function(extent, center, resolution, squaredTolerance) {
+
+  var interval = this.getInterval_(resolution);
+  if (interval == -1) {
+    this.meridians_.length = this.parallels_.length = 0;
+    return;
+  }
+
+  var centerLonLat = this.toLonLatTransform_(center);
+  var centerLon = centerLonLat[0];
+  var centerLat = centerLonLat[1];
+  var maxLines = this.maxLines_;
+  var cnt, idx, lat, lon;
+
+  var validExtent = [
+    Math.max(extent[0], this.minLonP_),
+    Math.max(extent[1], this.minLatP_),
+    Math.min(extent[2], this.maxLonP_),
+    Math.min(extent[3], this.maxLatP_)
+  ];
+
+  validExtent = ol.proj.transformExtent(validExtent, this.projection_,
+      'EPSG:4326');
+  var maxLat = validExtent[3];
+  var maxLon = validExtent[2];
+  var minLat = validExtent[1];
+  var minLon = validExtent[0];
+
+  // Create meridians
+
+  centerLon = Math.floor(centerLon / interval) * interval;
+  lon = ol.math.clamp(centerLon, this.minLon_, this.maxLon_);
+
+  idx = this.addMeridian_(lon, minLat, maxLat, squaredTolerance, extent, 0);
+
+  cnt = 0;
+  while (lon != this.minLon_ && cnt++ < maxLines) {
+    lon = Math.max(lon - interval, this.minLon_);
+    idx = this.addMeridian_(lon, minLat, maxLat, squaredTolerance, extent, idx);
+  }
+
+  lon = ol.math.clamp(centerLon, this.minLon_, this.maxLon_);
+
+  cnt = 0;
+  while (lon != this.maxLon_ && cnt++ < maxLines) {
+    lon = Math.min(lon + interval, this.maxLon_);
+    idx = this.addMeridian_(lon, minLat, maxLat, squaredTolerance, extent, idx);
+  }
+
+  this.meridians_.length = idx;
+
+  // Create parallels
+
+  centerLat = Math.floor(centerLat / interval) * interval;
+  lat = ol.math.clamp(centerLat, this.minLat_, this.maxLat_);
+
+  idx = this.addParallel_(lat, minLon, maxLon, squaredTolerance, extent, 0);
+
+  cnt = 0;
+  while (lat != this.minLat_ && cnt++ < maxLines) {
+    lat = Math.max(lat - interval, this.minLat_);
+    idx = this.addParallel_(lat, minLon, maxLon, squaredTolerance, extent, idx);
+  }
+
+  lat = ol.math.clamp(centerLat, this.minLat_, this.maxLat_);
+
+  cnt = 0;
+  while (lat != this.maxLat_ && cnt++ < maxLines) {
+    lat = Math.min(lat + interval, this.maxLat_);
+    idx = this.addParallel_(lat, minLon, maxLon, squaredTolerance, extent, idx);
+  }
+
+  this.parallels_.length = idx;
+
+};
+
+
+/**
+ * @param {number} resolution Resolution.
+ * @return {number} The interval in degrees.
+ * @private
+ */
+ol.Graticule.prototype.getInterval_ = function(resolution) {
+  var centerLon = this.projectionCenterLonLat_[0];
+  var centerLat = this.projectionCenterLonLat_[1];
+  var interval = -1;
+  var i, ii, delta, dist;
+  var target = Math.pow(this.targetSize_ * resolution, 2);
+  /** @type {Array.<number>} **/
+  var p1 = [];
+  /** @type {Array.<number>} **/
+  var p2 = [];
+  for (i = 0, ii = ol.Graticule.intervals_.length; i < ii; ++i) {
+    delta = ol.Graticule.intervals_[i] / 2;
+    p1[0] = centerLon - delta;
+    p1[1] = centerLat - delta;
+    p2[0] = centerLon + delta;
+    p2[1] = centerLat + delta;
+    this.fromLonLatTransform_(p1, p1);
+    this.fromLonLatTransform_(p2, p2);
+    dist = Math.pow(p2[0] - p1[0], 2) + Math.pow(p2[1] - p1[1], 2);
+    if (dist <= target) {
+      break;
+    }
+    interval = ol.Graticule.intervals_[i];
+  }
+  return interval;
+};
+
+
+/**
+ * Get the map associated with this graticule.
+ * @return {ol.Map} The map.
+ * @api
+ */
+ol.Graticule.prototype.getMap = function() {
+  return this.map_;
+};
+
+
+/**
+ * @param {number} lon Longitude.
+ * @param {number} minLat Minimal latitude.
+ * @param {number} maxLat Maximal latitude.
+ * @param {number} squaredTolerance Squared tolerance.
+ * @return {ol.geom.LineString} The meridian line string.
+ * @param {number} index Index.
+ * @private
+ */
+ol.Graticule.prototype.getMeridian_ = function(lon, minLat, maxLat,
+                                               squaredTolerance, index) {
+  goog.asserts.assert(lon >= this.minLon_,
+      'lon should be larger than or equal to this.minLon_');
+  goog.asserts.assert(lon <= this.maxLon_,
+      'lon should be smaller than or equal to this.maxLon_');
+  var flatCoordinates = ol.geom.flat.geodesic.meridian(lon,
+      minLat, maxLat, this.projection_, squaredTolerance);
+  goog.asserts.assert(flatCoordinates.length > 0,
+      'flatCoordinates cannot be empty');
+  var lineString = this.meridians_[index] !== undefined ?
+      this.meridians_[index] : new ol.geom.LineString(null);
+  lineString.setFlatCoordinates(ol.geom.GeometryLayout.XY, flatCoordinates);
+  return lineString;
+};
+
+
+/**
+ * Get the list of meridians.  Meridians are lines of equal longitude.
+ * @return {Array.<ol.geom.LineString>} The meridians.
+ * @api
+ */
+ol.Graticule.prototype.getMeridians = function() {
+  return this.meridians_;
+};
+
+
+/**
+ * @param {number} lat Latitude.
+ * @param {number} minLon Minimal longitude.
+ * @param {number} maxLon Maximal longitude.
+ * @param {number} squaredTolerance Squared tolerance.
+ * @return {ol.geom.LineString} The parallel line string.
+ * @param {number} index Index.
+ * @private
+ */
+ol.Graticule.prototype.getParallel_ = function(lat, minLon, maxLon,
+                                               squaredTolerance, index) {
+  goog.asserts.assert(lat >= this.minLat_,
+      'lat should be larger than or equal to this.minLat_');
+  goog.asserts.assert(lat <= this.maxLat_,
+      'lat should be smaller than or equal to this.maxLat_');
+  var flatCoordinates = ol.geom.flat.geodesic.parallel(lat,
+      this.minLon_, this.maxLon_, this.projection_, squaredTolerance);
+  goog.asserts.assert(flatCoordinates.length > 0,
+      'flatCoordinates cannot be empty');
+  var lineString = this.parallels_[index] !== undefined ?
+      this.parallels_[index] : new ol.geom.LineString(null);
+  lineString.setFlatCoordinates(ol.geom.GeometryLayout.XY, flatCoordinates);
+  return lineString;
+};
+
+
+/**
+ * Get the list of parallels.  Pallels are lines of equal latitude.
+ * @return {Array.<ol.geom.LineString>} The parallels.
+ * @api
+ */
+ol.Graticule.prototype.getParallels = function() {
+  return this.parallels_;
+};
+
+
+/**
+ * @param {ol.render.Event} e Event.
+ * @private
+ */
+ol.Graticule.prototype.handlePostCompose_ = function(e) {
+  var vectorContext = e.vectorContext;
+  var frameState = e.frameState;
+  var extent = frameState.extent;
+  var viewState = frameState.viewState;
+  var center = viewState.center;
+  var projection = viewState.projection;
+  var resolution = viewState.resolution;
+  var pixelRatio = frameState.pixelRatio;
+  var squaredTolerance =
+      resolution * resolution / (4 * pixelRatio * pixelRatio);
+
+  var updateProjectionInfo = !this.projection_ ||
+      !ol.proj.equivalent(this.projection_, projection);
+
+  if (updateProjectionInfo) {
+    this.updateProjectionInfo_(projection);
+  }
+
+  //Fix the extent if wrapped.
+  //(note: this is the same extent as vectorContext.extent_)
+  var offsetX = 0;
+  if (projection.canWrapX()) {
+    var projectionExtent = projection.getExtent();
+    var worldWidth = ol.extent.getWidth(projectionExtent);
+    var x = frameState.focus[0];
+    if (x < projectionExtent[0] || x > projectionExtent[2]) {
+      var worldsAway = Math.ceil((projectionExtent[0] - x) / worldWidth);
+      offsetX = worldWidth * worldsAway;
+      extent = [
+        extent[0] + offsetX, extent[1],
+        extent[2] + offsetX, extent[3]
+      ];
+    }
+  }
+
+  this.createGraticule_(extent, center, resolution, squaredTolerance);
+
+  // Draw the lines
+  vectorContext.setFillStrokeStyle(null, this.strokeStyle_);
+  var i, l, line;
+  for (i = 0, l = this.meridians_.length; i < l; ++i) {
+    line = this.meridians_[i];
+    vectorContext.drawLineStringGeometry(line, null);
+  }
+  for (i = 0, l = this.parallels_.length; i < l; ++i) {
+    line = this.parallels_[i];
+    vectorContext.drawLineStringGeometry(line, null);
+  }
+};
+
+
+/**
+ * @param {ol.proj.Projection} projection Projection.
+ * @private
+ */
+ol.Graticule.prototype.updateProjectionInfo_ = function(projection) {
+  goog.asserts.assert(projection, 'projection cannot be null');
+
+  var epsg4326Projection = ol.proj.get('EPSG:4326');
+
+  var extent = projection.getExtent();
+  var worldExtent = projection.getWorldExtent();
+  var worldExtentP = ol.proj.transformExtent(worldExtent,
+      epsg4326Projection, projection);
+
+  var maxLat = worldExtent[3];
+  var maxLon = worldExtent[2];
+  var minLat = worldExtent[1];
+  var minLon = worldExtent[0];
+
+  var maxLatP = worldExtentP[3];
+  var maxLonP = worldExtentP[2];
+  var minLatP = worldExtentP[1];
+  var minLonP = worldExtentP[0];
+
+  goog.asserts.assert(extent, 'extent cannot be null');
+  goog.asserts.assert(maxLat !== undefined, 'maxLat should be defined');
+  goog.asserts.assert(maxLon !== undefined, 'maxLon should be defined');
+  goog.asserts.assert(minLat !== undefined, 'minLat should be defined');
+  goog.asserts.assert(minLon !== undefined, 'minLon should be defined');
+
+  goog.asserts.assert(maxLatP !== undefined,
+      'projected maxLat should be defined');
+  goog.asserts.assert(maxLonP !== undefined,
+      'projected maxLon should be defined');
+  goog.asserts.assert(minLatP !== undefined,
+      'projected minLat should be defined');
+  goog.asserts.assert(minLonP !== undefined,
+      'projected minLon should be defined');
+
+  this.maxLat_ = maxLat;
+  this.maxLon_ = maxLon;
+  this.minLat_ = minLat;
+  this.minLon_ = minLon;
+
+  this.maxLatP_ = maxLatP;
+  this.maxLonP_ = maxLonP;
+  this.minLatP_ = minLatP;
+  this.minLonP_ = minLonP;
+
+
+  this.fromLonLatTransform_ = ol.proj.getTransform(
+      epsg4326Projection, projection);
+
+  this.toLonLatTransform_ = ol.proj.getTransform(
+      projection, epsg4326Projection);
+
+  this.projectionCenterLonLat_ = this.toLonLatTransform_(
+      ol.extent.getCenter(extent));
+
+  this.projection_ = projection;
+};
+
+
+/**
+ * Set the map for this graticule.  The graticule will be rendered on the
+ * provided map.
+ * @param {ol.Map} map Map.
+ * @api
+ */
+ol.Graticule.prototype.setMap = function(map) {
+  if (this.map_) {
+    this.map_.un(ol.render.EventType.POSTCOMPOSE,
+        this.handlePostCompose_, this);
+    this.map_.render();
+  }
+  if (map) {
+    map.on(ol.render.EventType.POSTCOMPOSE,
+        this.handlePostCompose_, this);
+    map.render();
+  }
+  this.map_ = map;
+};
+
+goog.provide('ol.Image');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('goog.object');
+goog.require('ol.ImageBase');
+goog.require('ol.ImageState');
+goog.require('ol.extent');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.ImageBase}
+ * @param {ol.Extent} extent Extent.
+ * @param {number|undefined} resolution Resolution.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {Array.<ol.Attribution>} attributions Attributions.
+ * @param {string} src Image source URI.
+ * @param {?string} crossOrigin Cross origin.
+ * @param {ol.ImageLoadFunctionType} imageLoadFunction Image load function.
+ */
+ol.Image = function(extent, resolution, pixelRatio, attributions, src,
+    crossOrigin, imageLoadFunction) {
+
+  goog.base(this, extent, resolution, pixelRatio, ol.ImageState.IDLE,
+      attributions);
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.src_ = src;
+
+  /**
+   * @private
+   * @type {HTMLCanvasElement|Image|HTMLVideoElement}
+   */
+  this.image_ = new Image();
+  if (crossOrigin !== null) {
+    this.image_.crossOrigin = crossOrigin;
+  }
+
+  /**
+   * @private
+   * @type {Object.<number, (HTMLCanvasElement|Image|HTMLVideoElement)>}
+   */
+  this.imageByContext_ = {};
+
+  /**
+   * @private
+   * @type {Array.<goog.events.Key>}
+   */
+  this.imageListenerKeys_ = null;
+
+  /**
+   * @protected
+   * @type {ol.ImageState}
+   */
+  this.state = ol.ImageState.IDLE;
+
+  /**
+   * @private
+   * @type {ol.ImageLoadFunctionType}
+   */
+  this.imageLoadFunction_ = imageLoadFunction;
+
+};
+goog.inherits(ol.Image, ol.ImageBase);
+
+
+/**
+ * Get the HTML image element (may be a Canvas, Image, or Video).
+ * @param {Object=} opt_context Object.
+ * @return {HTMLCanvasElement|Image|HTMLVideoElement} Image.
+ * @api
+ */
+ol.Image.prototype.getImage = function(opt_context) {
+  if (opt_context !== undefined) {
+    var image;
+    var key = goog.getUid(opt_context);
+    if (key in this.imageByContext_) {
+      return this.imageByContext_[key];
+    } else if (goog.object.isEmpty(this.imageByContext_)) {
+      image = this.image_;
+    } else {
+      image = /** @type {Image} */ (this.image_.cloneNode(false));
+    }
+    this.imageByContext_[key] = image;
+    return image;
+  } else {
+    return this.image_;
+  }
+};
+
+
+/**
+ * Tracks loading or read errors.
+ *
+ * @private
+ */
+ol.Image.prototype.handleImageError_ = function() {
+  this.state = ol.ImageState.ERROR;
+  this.unlistenImage_();
+  this.changed();
+};
+
+
+/**
+ * Tracks successful image load.
+ *
+ * @private
+ */
+ol.Image.prototype.handleImageLoad_ = function() {
+  if (this.resolution === undefined) {
+    this.resolution = ol.extent.getHeight(this.extent) / this.image_.height;
+  }
+  this.state = ol.ImageState.LOADED;
+  this.unlistenImage_();
+  this.changed();
+};
+
+
+/**
+ * Load not yet loaded URI.
+ */
+ol.Image.prototype.load = function() {
+  if (this.state == ol.ImageState.IDLE) {
+    this.state = ol.ImageState.LOADING;
+    this.changed();
+    goog.asserts.assert(!this.imageListenerKeys_,
+        'this.imageListenerKeys_ should be null');
+    this.imageListenerKeys_ = [
+      goog.events.listenOnce(this.image_, goog.events.EventType.ERROR,
+          this.handleImageError_, false, this),
+      goog.events.listenOnce(this.image_, goog.events.EventType.LOAD,
+          this.handleImageLoad_, false, this)
+    ];
+    this.imageLoadFunction_(this, this.src_);
+  }
+};
+
+
+/**
+ * @param {HTMLCanvasElement|Image|HTMLVideoElement} image Image.
+ */
+ol.Image.prototype.setImage = function(image) {
+  this.image_ = image;
+};
+
+
+/**
+ * Discards event handlers which listen for load completion or errors.
+ *
+ * @private
+ */
+ol.Image.prototype.unlistenImage_ = function() {
+  goog.asserts.assert(this.imageListenerKeys_,
+      'this.imageListenerKeys_ should not be null');
+  this.imageListenerKeys_.forEach(goog.events.unlistenByKey);
+  this.imageListenerKeys_ = null;
+};
+
+goog.provide('ol.ImageLoadFunctionType');
+
+
+/**
+ * A function that takes an {@link ol.Image} for the image and a `{string}` for
+ * the src as arguments. It is supposed to make it so the underlying image
+ * {@link ol.Image#getImage} is assigned the content specified by the src. If
+ * not specified, the default is
+ *
+ *     function(image, src) {
+ *       image.getImage().src = src;
+ *     }
+ *
+ * Providing a custom `imageLoadFunction` can be useful to load images with
+ * post requests or - in general - through XHR requests, where the src of the
+ * image element would be set to a data URI when the content is loaded.
+ *
+ * @typedef {function(ol.Image, string)}
+ * @api
+ */
+ol.ImageLoadFunctionType;
+
+goog.provide('ol.ImageTile');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('goog.object');
+goog.require('ol.Tile');
+goog.require('ol.TileCoord');
+goog.require('ol.TileLoadFunctionType');
+goog.require('ol.TileState');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.Tile}
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {ol.TileState} state State.
+ * @param {string} src Image source URI.
+ * @param {?string} crossOrigin Cross origin.
+ * @param {ol.TileLoadFunctionType} tileLoadFunction Tile load function.
+ */
+ol.ImageTile = function(tileCoord, state, src, crossOrigin, tileLoadFunction) {
+
+  goog.base(this, tileCoord, state);
+
+  /**
+   * Image URI
+   *
+   * @private
+   * @type {string}
+   */
+  this.src_ = src;
+
+  /**
+   * @private
+   * @type {Image}
+   */
+  this.image_ = new Image();
+  if (crossOrigin !== null) {
+    this.image_.crossOrigin = crossOrigin;
+  }
+
+  /**
+   * @private
+   * @type {Object.<number, Image>}
+   */
+  this.imageByContext_ = {};
+
+  /**
+   * @private
+   * @type {Array.<goog.events.Key>}
+   */
+  this.imageListenerKeys_ = null;
+
+  /**
+   * @private
+   * @type {ol.TileLoadFunctionType}
+   */
+  this.tileLoadFunction_ = tileLoadFunction;
+
+};
+goog.inherits(ol.ImageTile, ol.Tile);
+
+
+/**
+ * @inheritDoc
+ */
+ol.ImageTile.prototype.disposeInternal = function() {
+  if (this.state == ol.TileState.LOADING) {
+    this.unlistenImage_();
+  }
+  if (this.interimTile) {
+    goog.dispose(this.interimTile);
+  }
+  goog.base(this, 'disposeInternal');
+};
+
+
+/**
+ * Get the image element for this tile.
+ * @inheritDoc
+ * @api
+ */
+ol.ImageTile.prototype.getImage = function(opt_context) {
+  if (opt_context !== undefined) {
+    var image;
+    var key = goog.getUid(opt_context);
+    if (key in this.imageByContext_) {
+      return this.imageByContext_[key];
+    } else if (goog.object.isEmpty(this.imageByContext_)) {
+      image = this.image_;
+    } else {
+      image = /** @type {Image} */ (this.image_.cloneNode(false));
+    }
+    this.imageByContext_[key] = image;
+    return image;
+  } else {
+    return this.image_;
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.ImageTile.prototype.getKey = function() {
+  return this.src_;
+};
+
+
+/**
+ * Tracks loading or read errors.
+ *
+ * @private
+ */
+ol.ImageTile.prototype.handleImageError_ = function() {
+  this.state = ol.TileState.ERROR;
+  this.unlistenImage_();
+  this.changed();
+};
+
+
+/**
+ * Tracks successful image load.
+ *
+ * @private
+ */
+ol.ImageTile.prototype.handleImageLoad_ = function() {
+  if (this.image_.naturalWidth && this.image_.naturalHeight) {
+    this.state = ol.TileState.LOADED;
+  } else {
+    this.state = ol.TileState.EMPTY;
+  }
+  this.unlistenImage_();
+  this.changed();
+};
+
+
+/**
+ * Load not yet loaded URI.
+ */
+ol.ImageTile.prototype.load = function() {
+  if (this.state == ol.TileState.IDLE) {
+    this.state = ol.TileState.LOADING;
+    this.changed();
+    goog.asserts.assert(!this.imageListenerKeys_,
+        'this.imageListenerKeys_ should be null');
+    this.imageListenerKeys_ = [
+      goog.events.listenOnce(this.image_, goog.events.EventType.ERROR,
+          this.handleImageError_, false, this),
+      goog.events.listenOnce(this.image_, goog.events.EventType.LOAD,
+          this.handleImageLoad_, false, this)
+    ];
+    this.tileLoadFunction_(this, this.src_);
+  }
+};
+
+
+/**
+ * Discards event handlers which listen for load completion or errors.
+ *
+ * @private
+ */
+ol.ImageTile.prototype.unlistenImage_ = function() {
+  goog.asserts.assert(this.imageListenerKeys_,
+      'this.imageListenerKeys_ should not be null');
+  this.imageListenerKeys_.forEach(goog.events.unlistenByKey);
+  this.imageListenerKeys_ = null;
+};
+
+// Copyright 2010 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Provides a files drag and drop event detector. It works on
+ * HTML5 browsers.
+ *
+ * @see ../demos/filedrophandler.html
+ */
+
+goog.provide('goog.events.FileDropHandler');
+goog.provide('goog.events.FileDropHandler.EventType');
+
+goog.require('goog.array');
+goog.require('goog.dom');
+goog.require('goog.events.BrowserEvent');
+goog.require('goog.events.EventHandler');
+goog.require('goog.events.EventTarget');
+goog.require('goog.events.EventType');
+goog.require('goog.log');
+goog.require('goog.log.Level');
+
+
+
+/**
+ * A files drag and drop event detector. Gets an {@code element} as parameter
+ * and fires {@code goog.events.FileDropHandler.EventType.DROP} event when files
+ * are dropped in the {@code element}.
+ *
+ * @param {Element|Document} element The element or document to listen on.
+ * @param {boolean=} opt_preventDropOutside Whether to prevent a drop on the
+ *     area outside the {@code element}. Default false.
+ * @constructor
+ * @extends {goog.events.EventTarget}
+ * @final
+ */
+goog.events.FileDropHandler = function(element, opt_preventDropOutside) {
+  goog.events.EventTarget.call(this);
+
+  /**
+   * Handler for drag/drop events.
+   * @type {!goog.events.EventHandler<!goog.events.FileDropHandler>}
+   * @private
+   */
+  this.eventHandler_ = new goog.events.EventHandler(this);
+
+  var doc = element;
+  if (opt_preventDropOutside) {
+    doc = goog.dom.getOwnerDocument(element);
+  }
+
+  // Add dragenter listener to the owner document of the element.
+  this.eventHandler_.listen(doc,
+                            goog.events.EventType.DRAGENTER,
+                            this.onDocDragEnter_);
+
+  // Add dragover listener to the owner document of the element only if the
+  // document is not the element itself.
+  if (doc != element) {
+    this.eventHandler_.listen(doc,
+                              goog.events.EventType.DRAGOVER,
+                              this.onDocDragOver_);
+  }
+
+  // Add dragover and drop listeners to the element.
+  this.eventHandler_.listen(element,
+                            goog.events.EventType.DRAGOVER,
+                            this.onElemDragOver_);
+  this.eventHandler_.listen(element,
+                            goog.events.EventType.DROP,
+                            this.onElemDrop_);
+};
+goog.inherits(goog.events.FileDropHandler, goog.events.EventTarget);
+
+
+/**
+ * Whether the drag event contains files. It is initialized only in the
+ * dragenter event. It is used in all the drag events to prevent default actions
+ * only if the drag contains files. Preventing default actions is necessary to
+ * go from dragenter to dragover and from dragover to drop. However we do not
+ * always want to prevent default actions, e.g. when the user drags text or
+ * links on a text area we should not prevent the browser default action that
+ * inserts the text in the text area. It is also necessary to stop propagation
+ * when handling drag events on the element to prevent them from propagating
+ * to the document.
+ * @private
+ * @type {boolean}
+ */
+goog.events.FileDropHandler.prototype.dndContainsFiles_ = false;
+
+
+/**
+ * A logger, used to help us debug the algorithm.
+ * @type {goog.log.Logger}
+ * @private
+ */
+goog.events.FileDropHandler.prototype.logger_ =
+    goog.log.getLogger('goog.events.FileDropHandler');
+
+
+/**
+ * The types of events fired by this class.
+ * @enum {string}
+ */
+goog.events.FileDropHandler.EventType = {
+  DROP: goog.events.EventType.DROP
+};
+
+
+/** @override */
+goog.events.FileDropHandler.prototype.disposeInternal = function() {
+  goog.events.FileDropHandler.superClass_.disposeInternal.call(this);
+  this.eventHandler_.dispose();
+};
+
+
+/**
+ * Dispatches the DROP event.
+ * @param {goog.events.BrowserEvent} e The underlying browser event.
+ * @private
+ */
+goog.events.FileDropHandler.prototype.dispatch_ = function(e) {
+  goog.log.fine(this.logger_, 'Firing DROP event...');
+  var event = new goog.events.BrowserEvent(e.getBrowserEvent());
+  event.type = goog.events.FileDropHandler.EventType.DROP;
+  this.dispatchEvent(event);
+};
+
+
+/**
+ * Handles dragenter on the document.
+ * @param {goog.events.BrowserEvent} e The dragenter event.
+ * @private
+ */
+goog.events.FileDropHandler.prototype.onDocDragEnter_ = function(e) {
+  goog.log.log(this.logger_, goog.log.Level.FINER,
+      '"' + e.target.id + '" (' + e.target + ') dispatched: ' + e.type);
+  var dt = e.getBrowserEvent().dataTransfer;
+  // Check whether the drag event contains files.
+  this.dndContainsFiles_ = !!(dt &&
+      ((dt.types &&
+          (goog.array.contains(dt.types, 'Files') ||
+          goog.array.contains(dt.types, 'public.file-url'))) ||
+      (dt.files && dt.files.length > 0)));
+  // If it does
+  if (this.dndContainsFiles_) {
+    // Prevent default actions.
+    e.preventDefault();
+  }
+  goog.log.log(this.logger_, goog.log.Level.FINER,
+      'dndContainsFiles_: ' + this.dndContainsFiles_);
+};
+
+
+/**
+ * Handles dragging something over the document.
+ * @param {goog.events.BrowserEvent} e The dragover event.
+ * @private
+ */
+goog.events.FileDropHandler.prototype.onDocDragOver_ = function(e) {
+  goog.log.log(this.logger_, goog.log.Level.FINEST,
+      '"' + e.target.id + '" (' + e.target + ') dispatched: ' + e.type);
+  if (this.dndContainsFiles_) {
+    // Prevent default actions.
+    e.preventDefault();
+    // Disable the drop on the document outside the drop zone.
+    var dt = e.getBrowserEvent().dataTransfer;
+    dt.dropEffect = 'none';
+  }
+};
+
+
+/**
+ * Handles dragging something over the element (drop zone).
+ * @param {goog.events.BrowserEvent} e The dragover event.
+ * @private
+ */
+goog.events.FileDropHandler.prototype.onElemDragOver_ = function(e) {
+  goog.log.log(this.logger_, goog.log.Level.FINEST,
+      '"' + e.target.id + '" (' + e.target + ') dispatched: ' + e.type);
+  if (this.dndContainsFiles_) {
+    // Prevent default actions and stop the event from propagating further to
+    // the document. Both lines are needed! (See comment above).
+    e.preventDefault();
+    e.stopPropagation();
+    // Allow the drop on the drop zone.
+    var dt = e.getBrowserEvent().dataTransfer;
+
+    // IE bug #811625 (https://goo.gl/UWuxX0) will throw error SCRIPT65535
+    // when attempting to set property effectAllowed on IE10+.
+    // See more: https://github.com/google/closure-library/issues/485.
+    try {
+      dt.effectAllowed = 'all';
+    } catch (err) {
+    }
+    dt.dropEffect = 'copy';
+  }
+};
+
+
+/**
+ * Handles dropping something onto the element (drop zone).
+ * @param {goog.events.BrowserEvent} e The drop event.
+ * @private
+ */
+goog.events.FileDropHandler.prototype.onElemDrop_ = function(e) {
+  goog.log.log(this.logger_, goog.log.Level.FINER,
+      '"' + e.target.id + '" (' + e.target + ') dispatched: ' + e.type);
+  // If the drag and drop event contains files.
+  if (this.dndContainsFiles_) {
+    // Prevent default actions and stop the event from propagating further to
+    // the document. Both lines are needed! (See comment above).
+    e.preventDefault();
+    e.stopPropagation();
+    // Dispatch DROP event.
+    this.dispatch_(e);
+  }
+};
+
+// Copyright 2007 Bob Ippolito. All Rights Reserved.
+// Modifications Copyright 2009 The Closure Library Authors. All Rights
+// Reserved.
+
+/**
+ * @license Portions of this code are from MochiKit, received by
+ * The Closure Authors under the MIT license. All other code is Copyright
+ * 2005-2009 The Closure Authors. All Rights Reserved.
+ */
+
+/**
+ * @fileoverview Classes for tracking asynchronous operations and handling the
+ * results. The Deferred object here is patterned after the Deferred object in
+ * the Twisted python networking framework.
+ *
+ * See: http://twistedmatrix.com/projects/core/documentation/howto/defer.html
+ *
+ * Based on the Dojo code which in turn is based on the MochiKit code.
+ *
+ * @author arv@google.com (Erik Arvidsson)
+ * @author brenneman@google.com (Shawn Brenneman)
+ */
+
+goog.provide('goog.async.Deferred');
+goog.provide('goog.async.Deferred.AlreadyCalledError');
+goog.provide('goog.async.Deferred.CanceledError');
+
+goog.require('goog.Promise');
+goog.require('goog.Thenable');
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.debug.Error');
+
+
+
+/**
+ * A Deferred represents the result of an asynchronous operation. A Deferred
+ * instance has no result when it is created, and is "fired" (given an initial
+ * result) by calling {@code callback} or {@code errback}.
+ *
+ * Once fired, the result is passed through a sequence of callback functions
+ * registered with {@code addCallback} or {@code addErrback}. The functions may
+ * mutate the result before it is passed to the next function in the sequence.
+ *
+ * Callbacks and errbacks may be added at any time, including after the Deferred
+ * has been "fired". If there are no pending actions in the execution sequence
+ * of a fired Deferred, any new callback functions will be called with the last
+ * computed result. Adding a callback function is the only way to access the
+ * result of the Deferred.
+ *
+ * If a Deferred operation is canceled, an optional user-provided cancellation
+ * function is invoked which may perform any special cleanup, followed by firing
+ * the Deferred's errback sequence with a {@code CanceledError}. If the
+ * Deferred has already fired, cancellation is ignored.
+ *
+ * Deferreds may be templated to a specific type they produce using generics
+ * with syntax such as:
+ * <code>
+ *   /** @type {goog.async.Deferred<string>} *&#47;
+ *   var d = new goog.async.Deferred();
+ *   // Compiler can infer that foo is a string.
+ *   d.addCallback(function(foo) {...});
+ *   d.callback('string');  // Checked to be passed a string
+ * </code>
+ * Since deferreds are often used to produce different values across a chain,
+ * the type information is not propagated across chains, but rather only
+ * associated with specifically cast objects.
+ *
+ * @param {Function=} opt_onCancelFunction A function that will be called if the
+ *     Deferred is canceled. If provided, this function runs before the
+ *     Deferred is fired with a {@code CanceledError}.
+ * @param {Object=} opt_defaultScope The default object context to call
+ *     callbacks and errbacks in.
+ * @constructor
+ * @implements {goog.Thenable<VALUE>}
+ * @template VALUE
+ */
+goog.async.Deferred = function(opt_onCancelFunction, opt_defaultScope) {
+  /**
+   * Entries in the sequence are arrays containing a callback, an errback, and
+   * an optional scope. The callback or errback in an entry may be null.
+   * @type {!Array<!Array>}
+   * @private
+   */
+  this.sequence_ = [];
+
+  /**
+   * Optional function that will be called if the Deferred is canceled.
+   * @type {Function|undefined}
+   * @private
+   */
+  this.onCancelFunction_ = opt_onCancelFunction;
+
+  /**
+   * The default scope to execute callbacks and errbacks in.
+   * @type {Object}
+   * @private
+   */
+  this.defaultScope_ = opt_defaultScope || null;
+
+  /**
+   * Whether the Deferred has been fired.
+   * @type {boolean}
+   * @private
+   */
+  this.fired_ = false;
+
+  /**
+   * Whether the last result in the execution sequence was an error.
+   * @type {boolean}
+   * @private
+   */
+  this.hadError_ = false;
+
+  /**
+   * The current Deferred result, updated as callbacks and errbacks are
+   * executed.
+   * @type {*}
+   * @private
+   */
+  this.result_ = undefined;
+
+  /**
+   * Whether the Deferred is blocked waiting on another Deferred to fire. If a
+   * callback or errback returns a Deferred as a result, the execution sequence
+   * is blocked until that Deferred result becomes available.
+   * @type {boolean}
+   * @private
+   */
+  this.blocked_ = false;
+
+  /**
+   * Whether this Deferred is blocking execution of another Deferred. If this
+   * instance was returned as a result in another Deferred's execution
+   * sequence,that other Deferred becomes blocked until this instance's
+   * execution sequence completes. No additional callbacks may be added to a
+   * Deferred once it is blocking another instance.
+   * @type {boolean}
+   * @private
+   */
+  this.blocking_ = false;
+
+  /**
+   * Whether the Deferred has been canceled without having a custom cancel
+   * function.
+   * @type {boolean}
+   * @private
+   */
+  this.silentlyCanceled_ = false;
+
+  /**
+   * If an error is thrown during Deferred execution with no errback to catch
+   * it, the error is rethrown after a timeout. Reporting the error after a
+   * timeout allows execution to continue in the calling context (empty when
+   * no error is scheduled).
+   * @type {number}
+   * @private
+   */
+  this.unhandledErrorId_ = 0;
+
+  /**
+   * If this Deferred was created by branch(), this will be the "parent"
+   * Deferred.
+   * @type {goog.async.Deferred}
+   * @private
+   */
+  this.parent_ = null;
+
+  /**
+   * The number of Deferred objects that have been branched off this one. This
+   * will be decremented whenever a branch is fired or canceled.
+   * @type {number}
+   * @private
+   */
+  this.branches_ = 0;
+
+  if (goog.async.Deferred.LONG_STACK_TRACES) {
+    /**
+     * Holds the stack trace at time of deferred creation if the JS engine
+     * provides the Error.captureStackTrace API.
+     * @private {?string}
+     */
+    this.constructorStack_ = null;
+    if (Error.captureStackTrace) {
+      var target = { stack: '' };
+      Error.captureStackTrace(target, goog.async.Deferred);
+      // Check if Error.captureStackTrace worked. It fails in gjstest.
+      if (typeof target.stack == 'string') {
+        // Remove first line and force stringify to prevent memory leak due to
+        // holding on to actual stack frames.
+        this.constructorStack_ = target.stack.replace(/^[^\n]*\n/, '');
+      }
+    }
+  }
+};
+
+
+/**
+ * @define {boolean} Whether unhandled errors should always get rethrown to the
+ * global scope. Defaults to the value of goog.DEBUG.
+ */
+goog.define('goog.async.Deferred.STRICT_ERRORS', false);
+
+
+/**
+ * @define {boolean} Whether to attempt to make stack traces long.  Defaults to
+ * the value of goog.DEBUG.
+ */
+goog.define('goog.async.Deferred.LONG_STACK_TRACES', false);
+
+
+/**
+ * Cancels a Deferred that has not yet been fired, or is blocked on another
+ * deferred operation. If this Deferred is waiting for a blocking Deferred to
+ * fire, the blocking Deferred will also be canceled.
+ *
+ * If this Deferred was created by calling branch() on a parent Deferred with
+ * opt_propagateCancel set to true, the parent may also be canceled. If
+ * opt_deepCancel is set, cancel() will be called on the parent (as well as any
+ * other ancestors if the parent is also a branch). If one or more branches were
+ * created with opt_propagateCancel set to true, the parent will be canceled if
+ * cancel() is called on all of those branches.
+ *
+ * @param {boolean=} opt_deepCancel If true, cancels this Deferred's parent even
+ *     if cancel() hasn't been called on some of the parent's branches. Has no
+ *     effect on a branch without opt_propagateCancel set to true.
+ */
+goog.async.Deferred.prototype.cancel = function(opt_deepCancel) {
+  if (!this.hasFired()) {
+    if (this.parent_) {
+      // Get rid of the parent reference before potentially running the parent's
+      // canceler function to ensure that this cancellation isn't
+      // double-counted.
+      var parent = this.parent_;
+      delete this.parent_;
+      if (opt_deepCancel) {
+        parent.cancel(opt_deepCancel);
+      } else {
+        parent.branchCancel_();
+      }
+    }
+
+    if (this.onCancelFunction_) {
+      // Call in user-specified scope.
+      this.onCancelFunction_.call(this.defaultScope_, this);
+    } else {
+      this.silentlyCanceled_ = true;
+    }
+    if (!this.hasFired()) {
+      this.errback(new goog.async.Deferred.CanceledError(this));
+    }
+  } else if (this.result_ instanceof goog.async.Deferred) {
+    this.result_.cancel();
+  }
+};
+
+
+/**
+ * Handle a single branch being canceled. Once all branches are canceled, this
+ * Deferred will be canceled as well.
+ *
+ * @private
+ */
+goog.async.Deferred.prototype.branchCancel_ = function() {
+  this.branches_--;
+  if (this.branches_ <= 0) {
+    this.cancel();
+  }
+};
+
+
+/**
+ * Called after a blocking Deferred fires. Unblocks this Deferred and resumes
+ * its execution sequence.
+ *
+ * @param {boolean} isSuccess Whether the result is a success or an error.
+ * @param {*} res The result of the blocking Deferred.
+ * @private
+ */
+goog.async.Deferred.prototype.continue_ = function(isSuccess, res) {
+  this.blocked_ = false;
+  this.updateResult_(isSuccess, res);
+};
+
+
+/**
+ * Updates the current result based on the success or failure of the last action
+ * in the execution sequence.
+ *
+ * @param {boolean} isSuccess Whether the new result is a success or an error.
+ * @param {*} res The result.
+ * @private
+ */
+goog.async.Deferred.prototype.updateResult_ = function(isSuccess, res) {
+  this.fired_ = true;
+  this.result_ = res;
+  this.hadError_ = !isSuccess;
+  this.fire_();
+};
+
+
+/**
+ * Verifies that the Deferred has not yet been fired.
+ *
+ * @private
+ * @throws {Error} If this has already been fired.
+ */
+goog.async.Deferred.prototype.check_ = function() {
+  if (this.hasFired()) {
+    if (!this.silentlyCanceled_) {
+      throw new goog.async.Deferred.AlreadyCalledError(this);
+    }
+    this.silentlyCanceled_ = false;
+  }
+};
+
+
+/**
+ * Fire the execution sequence for this Deferred by passing the starting result
+ * to the first registered callback.
+ * @param {VALUE=} opt_result The starting result.
+ */
+goog.async.Deferred.prototype.callback = function(opt_result) {
+  this.check_();
+  this.assertNotDeferred_(opt_result);
+  this.updateResult_(true /* isSuccess */, opt_result);
+};
+
+
+/**
+ * Fire the execution sequence for this Deferred by passing the starting error
+ * result to the first registered errback.
+ * @param {*=} opt_result The starting error.
+ */
+goog.async.Deferred.prototype.errback = function(opt_result) {
+  this.check_();
+  this.assertNotDeferred_(opt_result);
+  this.makeStackTraceLong_(opt_result);
+  this.updateResult_(false /* isSuccess */, opt_result);
+};
+
+
+/**
+ * Attempt to make the error's stack trace be long in that it contains the
+ * stack trace from the point where the deferred was created on top of the
+ * current stack trace to give additional context.
+ * @param {*} error
+ * @private
+ */
+goog.async.Deferred.prototype.makeStackTraceLong_ = function(error) {
+  if (!goog.async.Deferred.LONG_STACK_TRACES) {
+    return;
+  }
+  if (this.constructorStack_ && goog.isObject(error) && error.stack &&
+      // Stack looks like it was system generated. See
+      // https://code.google.com/p/v8/wiki/JavaScriptStackTraceApi
+      (/^[^\n]+(\n   [^\n]+)+/).test(error.stack)) {
+    error.stack = error.stack + '\nDEFERRED OPERATION:\n' +
+        this.constructorStack_;
+  }
+};
+
+
+/**
+ * Asserts that an object is not a Deferred.
+ * @param {*} obj The object to test.
+ * @throws {Error} Throws an exception if the object is a Deferred.
+ * @private
+ */
+goog.async.Deferred.prototype.assertNotDeferred_ = function(obj) {
+  goog.asserts.assert(
+      !(obj instanceof goog.async.Deferred),
+      'An execution sequence may not be initiated with a blocking Deferred.');
+};
+
+
+/**
+ * Register a callback function to be called with a successful result. If no
+ * value is returned by the callback function, the result value is unchanged. If
+ * a new value is returned, it becomes the Deferred result and will be passed to
+ * the next callback in the execution sequence.
+ *
+ * If the function throws an error, the error becomes the new result and will be
+ * passed to the next errback in the execution chain.
+ *
+ * If the function returns a Deferred, the execution sequence will be blocked
+ * until that Deferred fires. Its result will be passed to the next callback (or
+ * errback if it is an error result) in this Deferred's execution sequence.
+ *
+ * @param {!function(this:T,VALUE):?} cb The function to be called with a
+ *     successful result.
+ * @param {T=} opt_scope An optional scope to call the callback in.
+ * @return {!goog.async.Deferred} This Deferred.
+ * @template T
+ */
+goog.async.Deferred.prototype.addCallback = function(cb, opt_scope) {
+  return this.addCallbacks(cb, null, opt_scope);
+};
+
+
+/**
+ * Register a callback function to be called with an error result. If no value
+ * is returned by the function, the error result is unchanged. If a new error
+ * value is returned or thrown, that error becomes the Deferred result and will
+ * be passed to the next errback in the execution sequence.
+ *
+ * If the errback function handles the error by returning a non-error value,
+ * that result will be passed to the next normal callback in the sequence.
+ *
+ * If the function returns a Deferred, the execution sequence will be blocked
+ * until that Deferred fires. Its result will be passed to the next callback (or
+ * errback if it is an error result) in this Deferred's execution sequence.
+ *
+ * @param {!function(this:T,?):?} eb The function to be called on an
+ *     unsuccessful result.
+ * @param {T=} opt_scope An optional scope to call the errback in.
+ * @return {!goog.async.Deferred<VALUE>} This Deferred.
+ * @template T
+ */
+goog.async.Deferred.prototype.addErrback = function(eb, opt_scope) {
+  return this.addCallbacks(null, eb, opt_scope);
+};
+
+
+/**
+ * Registers one function as both a callback and errback.
+ *
+ * @param {!function(this:T,?):?} f The function to be called on any result.
+ * @param {T=} opt_scope An optional scope to call the function in.
+ * @return {!goog.async.Deferred} This Deferred.
+ * @template T
+ */
+goog.async.Deferred.prototype.addBoth = function(f, opt_scope) {
+  return this.addCallbacks(f, f, opt_scope);
+};
+
+
+/**
+ * Like addBoth, but propagates uncaught exceptions in the errback.
+ *
+ * @param {function(this:T,?):?} f The function to be called on any result.
+ * @param {T=} opt_scope An optional scope to call the function in.
+ * @return {!goog.async.Deferred<VALUE>} This Deferred.
+ * @template T
+ */
+goog.async.Deferred.prototype.addFinally = function(f, opt_scope) {
+  var self = this;
+  return this.addCallbacks(f, function(err) {
+    var result = f.call(self, err);
+    if (!goog.isDef(result)) {
+      throw err;
+    }
+    return result;
+  }, opt_scope);
+};
+
+
+/**
+ * Registers a callback function and an errback function at the same position
+ * in the execution sequence. Only one of these functions will execute,
+ * depending on the error state during the execution sequence.
+ *
+ * NOTE: This is not equivalent to {@code def.addCallback().addErrback()}! If
+ * the callback is invoked, the errback will be skipped, and vice versa.
+ *
+ * @param {?(function(this:T,VALUE):?)} cb The function to be called on a
+ *     successful result.
+ * @param {?(function(this:T,?):?)} eb The function to be called on an
+ *     unsuccessful result.
+ * @param {T=} opt_scope An optional scope to call the functions in.
+ * @return {!goog.async.Deferred} This Deferred.
+ * @template T
+ */
+goog.async.Deferred.prototype.addCallbacks = function(cb, eb, opt_scope) {
+  goog.asserts.assert(!this.blocking_, 'Blocking Deferreds can not be re-used');
+  this.sequence_.push([cb, eb, opt_scope]);
+  if (this.hasFired()) {
+    this.fire_();
+  }
+  return this;
+};
+
+
+/**
+ * Implements {@see goog.Thenable} for seamless integration with
+ * {@see goog.Promise}.
+ * Deferred results are mutable and may represent multiple values over
+ * their lifetime. Calling {@code then} on a Deferred returns a Promise
+ * with the result of the Deferred at that point in its callback chain.
+ * Note that if the Deferred result is never mutated, and only
+ * {@code then} calls are made, the Deferred will behave like a Promise.
+ *
+ * @override
+ */
+goog.async.Deferred.prototype.then = function(opt_onFulfilled, opt_onRejected,
+    opt_context) {
+  var resolve, reject;
+  var promise = new goog.Promise(function(res, rej) {
+    // Copying resolvers to outer scope, so that they are available when the
+    // deferred callback fires (which may be synchronous).
+    resolve = res;
+    reject = rej;
+  });
+  this.addCallbacks(resolve, function(reason) {
+    if (reason instanceof goog.async.Deferred.CanceledError) {
+      promise.cancel();
+    } else {
+      reject(reason);
+    }
+  });
+  return promise.then(opt_onFulfilled, opt_onRejected, opt_context);
+};
+goog.Thenable.addImplementation(goog.async.Deferred);
+
+
+/**
+ * Links another Deferred to the end of this Deferred's execution sequence. The
+ * result of this execution sequence will be passed as the starting result for
+ * the chained Deferred, invoking either its first callback or errback.
+ *
+ * @param {!goog.async.Deferred} otherDeferred The Deferred to chain.
+ * @return {!goog.async.Deferred} This Deferred.
+ */
+goog.async.Deferred.prototype.chainDeferred = function(otherDeferred) {
+  this.addCallbacks(
+      otherDeferred.callback, otherDeferred.errback, otherDeferred);
+  return this;
+};
+
+
+/**
+ * Makes this Deferred wait for another Deferred's execution sequence to
+ * complete before continuing.
+ *
+ * This is equivalent to adding a callback that returns {@code otherDeferred},
+ * but doesn't prevent additional callbacks from being added to
+ * {@code otherDeferred}.
+ *
+ * @param {!goog.async.Deferred|!goog.Thenable} otherDeferred The Deferred
+ *     to wait for.
+ * @return {!goog.async.Deferred} This Deferred.
+ */
+goog.async.Deferred.prototype.awaitDeferred = function(otherDeferred) {
+  if (!(otherDeferred instanceof goog.async.Deferred)) {
+    // The Thenable case.
+    return this.addCallback(function() {
+      return otherDeferred;
+    });
+  }
+  return this.addCallback(goog.bind(otherDeferred.branch, otherDeferred));
+};
+
+
+/**
+ * Creates a branch off this Deferred's execution sequence, and returns it as a
+ * new Deferred. The branched Deferred's starting result will be shared with the
+ * parent at the point of the branch, even if further callbacks are added to the
+ * parent.
+ *
+ * All branches at the same stage in the execution sequence will receive the
+ * same starting value.
+ *
+ * @param {boolean=} opt_propagateCancel If cancel() is called on every child
+ *     branch created with opt_propagateCancel, the parent will be canceled as
+ *     well.
+ * @return {!goog.async.Deferred<VALUE>} A Deferred that will be started with
+ *     the computed result from this stage in the execution sequence.
+ */
+goog.async.Deferred.prototype.branch = function(opt_propagateCancel) {
+  var d = new goog.async.Deferred();
+  this.chainDeferred(d);
+  if (opt_propagateCancel) {
+    d.parent_ = this;
+    this.branches_++;
+  }
+  return d;
+};
+
+
+/**
+ * @return {boolean} Whether the execution sequence has been started on this
+ *     Deferred by invoking {@code callback} or {@code errback}.
+ */
+goog.async.Deferred.prototype.hasFired = function() {
+  return this.fired_;
+};
+
+
+/**
+ * @param {*} res The latest result in the execution sequence.
+ * @return {boolean} Whether the current result is an error that should cause
+ *     the next errback to fire. May be overridden by subclasses to handle
+ *     special error types.
+ * @protected
+ */
+goog.async.Deferred.prototype.isError = function(res) {
+  return res instanceof Error;
+};
+
+
+/**
+ * @return {boolean} Whether an errback exists in the remaining sequence.
+ * @private
+ */
+goog.async.Deferred.prototype.hasErrback_ = function() {
+  return goog.array.some(this.sequence_, function(sequenceRow) {
+    // The errback is the second element in the array.
+    return goog.isFunction(sequenceRow[1]);
+  });
+};
+
+
+/**
+ * Exhausts the execution sequence while a result is available. The result may
+ * be modified by callbacks or errbacks, and execution will block if the
+ * returned result is an incomplete Deferred.
+ *
+ * @private
+ */
+goog.async.Deferred.prototype.fire_ = function() {
+  if (this.unhandledErrorId_ && this.hasFired() && this.hasErrback_()) {
+    // It is possible to add errbacks after the Deferred has fired. If a new
+    // errback is added immediately after the Deferred encountered an unhandled
+    // error, but before that error is rethrown, the error is unscheduled.
+    goog.async.Deferred.unscheduleError_(this.unhandledErrorId_);
+    this.unhandledErrorId_ = 0;
+  }
+
+  if (this.parent_) {
+    this.parent_.branches_--;
+    delete this.parent_;
+  }
+
+  var res = this.result_;
+  var unhandledException = false;
+  var isNewlyBlocked = false;
+
+  while (this.sequence_.length && !this.blocked_) {
+    var sequenceEntry = this.sequence_.shift();
+
+    var callback = sequenceEntry[0];
+    var errback = sequenceEntry[1];
+    var scope = sequenceEntry[2];
+
+    var f = this.hadError_ ? errback : callback;
+    if (f) {
+      /** @preserveTry */
+      try {
+        var ret = f.call(scope || this.defaultScope_, res);
+
+        // If no result, then use previous result.
+        if (goog.isDef(ret)) {
+          // Bubble up the error as long as the return value hasn't changed.
+          this.hadError_ = this.hadError_ && (ret == res || this.isError(ret));
+          this.result_ = res = ret;
+        }
+
+        if (goog.Thenable.isImplementedBy(res) ||
+            (typeof goog.global['Promise'] === 'function' &&
+            res instanceof goog.global['Promise'])) {
+          isNewlyBlocked = true;
+          this.blocked_ = true;
+        }
+
+      } catch (ex) {
+        res = ex;
+        this.hadError_ = true;
+        this.makeStackTraceLong_(res);
+
+        if (!this.hasErrback_()) {
+          // If an error is thrown with no additional errbacks in the queue,
+          // prepare to rethrow the error.
+          unhandledException = true;
+        }
+      }
+    }
+  }
+
+  this.result_ = res;
+
+  if (isNewlyBlocked) {
+    var onCallback = goog.bind(this.continue_, this, true /* isSuccess */);
+    var onErrback = goog.bind(this.continue_, this, false /* isSuccess */);
+
+    if (res instanceof goog.async.Deferred) {
+      res.addCallbacks(onCallback, onErrback);
+      res.blocking_ = true;
+    } else {
+      res.then(onCallback, onErrback);
+    }
+  } else if (goog.async.Deferred.STRICT_ERRORS && this.isError(res) &&
+      !(res instanceof goog.async.Deferred.CanceledError)) {
+    this.hadError_ = true;
+    unhandledException = true;
+  }
+
+  if (unhandledException) {
+    // Rethrow the unhandled error after a timeout. Execution will continue, but
+    // the error will be seen by global handlers and the user. The throw will
+    // be canceled if another errback is appended before the timeout executes.
+    // The error's original stack trace is preserved where available.
+    this.unhandledErrorId_ = goog.async.Deferred.scheduleError_(res);
+  }
+};
+
+
+/**
+ * Creates a Deferred that has an initial result.
+ *
+ * @param {*=} opt_result The result.
+ * @return {!goog.async.Deferred} The new Deferred.
+ */
+goog.async.Deferred.succeed = function(opt_result) {
+  var d = new goog.async.Deferred();
+  d.callback(opt_result);
+  return d;
+};
+
+
+/**
+ * Creates a Deferred that fires when the given promise resolves.
+ * Use only during migration to Promises.
+ *
+ * @param {!goog.Promise<T>} promise
+ * @return {!goog.async.Deferred<T>} The new Deferred.
+ * @template T
+ */
+goog.async.Deferred.fromPromise = function(promise) {
+  var d = new goog.async.Deferred();
+  d.callback();
+  d.addCallback(function() {
+    return promise;
+  });
+  return d;
+};
+
+
+/**
+ * Creates a Deferred that has an initial error result.
+ *
+ * @param {*} res The error result.
+ * @return {!goog.async.Deferred} The new Deferred.
+ */
+goog.async.Deferred.fail = function(res) {
+  var d = new goog.async.Deferred();
+  d.errback(res);
+  return d;
+};
+
+
+/**
+ * Creates a Deferred that has already been canceled.
+ *
+ * @return {!goog.async.Deferred} The new Deferred.
+ */
+goog.async.Deferred.canceled = function() {
+  var d = new goog.async.Deferred();
+  d.cancel();
+  return d;
+};
+
+
+/**
+ * Normalizes values that may or may not be Deferreds.
+ *
+ * If the input value is a Deferred, the Deferred is branched (so the original
+ * execution sequence is not modified) and the input callback added to the new
+ * branch. The branch is returned to the caller.
+ *
+ * If the input value is not a Deferred, the callback will be executed
+ * immediately and an already firing Deferred will be returned to the caller.
+ *
+ * In the following (contrived) example, if <code>isImmediate</code> is true
+ * then 3 is alerted immediately, otherwise 6 is alerted after a 2-second delay.
+ *
+ * <pre>
+ * var value;
+ * if (isImmediate) {
+ *   value = 3;
+ * } else {
+ *   value = new goog.async.Deferred();
+ *   setTimeout(function() { value.callback(6); }, 2000);
+ * }
+ *
+ * var d = goog.async.Deferred.when(value, alert);
+ * </pre>
+ *
+ * @param {*} value Deferred or normal value to pass to the callback.
+ * @param {!function(this:T, ?):?} callback The callback to execute.
+ * @param {T=} opt_scope An optional scope to call the callback in.
+ * @return {!goog.async.Deferred} A new Deferred that will call the input
+ *     callback with the input value.
+ * @template T
+ */
+goog.async.Deferred.when = function(value, callback, opt_scope) {
+  if (value instanceof goog.async.Deferred) {
+    return value.branch(true).addCallback(callback, opt_scope);
+  } else {
+    return goog.async.Deferred.succeed(value).addCallback(callback, opt_scope);
+  }
+};
+
+
+
+/**
+ * An error sub class that is used when a Deferred has already been called.
+ * @param {!goog.async.Deferred} deferred The Deferred.
+ *
+ * @constructor
+ * @extends {goog.debug.Error}
+ */
+goog.async.Deferred.AlreadyCalledError = function(deferred) {
+  goog.debug.Error.call(this);
+
+  /**
+   * The Deferred that raised this error.
+   * @type {goog.async.Deferred}
+   */
+  this.deferred = deferred;
+};
+goog.inherits(goog.async.Deferred.AlreadyCalledError, goog.debug.Error);
+
+
+/** @override */
+goog.async.Deferred.AlreadyCalledError.prototype.message =
+    'Deferred has already fired';
+
+
+/** @override */
+goog.async.Deferred.AlreadyCalledError.prototype.name = 'AlreadyCalledError';
+
+
+
+/**
+ * An error sub class that is used when a Deferred is canceled.
+ *
+ * @param {!goog.async.Deferred} deferred The Deferred object.
+ * @constructor
+ * @extends {goog.debug.Error}
+ */
+goog.async.Deferred.CanceledError = function(deferred) {
+  goog.debug.Error.call(this);
+
+  /**
+   * The Deferred that raised this error.
+   * @type {goog.async.Deferred}
+   */
+  this.deferred = deferred;
+};
+goog.inherits(goog.async.Deferred.CanceledError, goog.debug.Error);
+
+
+/** @override */
+goog.async.Deferred.CanceledError.prototype.message = 'Deferred was canceled';
+
+
+/** @override */
+goog.async.Deferred.CanceledError.prototype.name = 'CanceledError';
+
+
+
+/**
+ * Wrapper around errors that are scheduled to be thrown by failing deferreds
+ * after a timeout.
+ *
+ * @param {*} error Error from a failing deferred.
+ * @constructor
+ * @final
+ * @private
+ * @struct
+ */
+goog.async.Deferred.Error_ = function(error) {
+  /** @const @private {number} */
+  this.id_ = goog.global.setTimeout(goog.bind(this.throwError, this), 0);
+
+  /** @const @private {*} */
+  this.error_ = error;
+};
+
+
+/**
+ * Actually throws the error and removes it from the list of pending
+ * deferred errors.
+ */
+goog.async.Deferred.Error_.prototype.throwError = function() {
+  goog.asserts.assert(goog.async.Deferred.errorMap_[this.id_],
+      'Cannot throw an error that is not scheduled.');
+  delete goog.async.Deferred.errorMap_[this.id_];
+  throw this.error_;
+};
+
+
+/**
+ * Resets the error throw timer.
+ */
+goog.async.Deferred.Error_.prototype.resetTimer = function() {
+  goog.global.clearTimeout(this.id_);
+};
+
+
+/**
+ * Map of unhandled errors scheduled to be rethrown in a future timestep.
+ * @private {!Object<number|string, goog.async.Deferred.Error_>}
+ */
+goog.async.Deferred.errorMap_ = {};
+
+
+/**
+ * Schedules an error to be thrown after a delay.
+ * @param {*} error Error from a failing deferred.
+ * @return {number} Id of the error.
+ * @private
+ */
+goog.async.Deferred.scheduleError_ = function(error) {
+  var deferredError = new goog.async.Deferred.Error_(error);
+  goog.async.Deferred.errorMap_[deferredError.id_] = deferredError;
+  return deferredError.id_;
+};
+
+
+/**
+ * Unschedules an error from being thrown.
+ * @param {number} id Id of the deferred error to unschedule.
+ * @private
+ */
+goog.async.Deferred.unscheduleError_ = function(id) {
+  var error = goog.async.Deferred.errorMap_[id];
+  if (error) {
+    error.resetTimer();
+    delete goog.async.Deferred.errorMap_[id];
+  }
+};
+
+
+/**
+ * Asserts that there are no pending deferred errors. If there are any
+ * scheduled errors, one will be thrown immediately to make this function fail.
+ */
+goog.async.Deferred.assertNoErrors = function() {
+  var map = goog.async.Deferred.errorMap_;
+  for (var key in map) {
+    var error = map[key];
+    error.resetTimer();
+    error.throwError();
+  }
+};
+
+// Copyright 2011 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview A wrapper for the HTML5 FileError object.
+ *
+ */
+
+goog.provide('goog.fs.Error');
+goog.provide('goog.fs.Error.ErrorCode');
+
+goog.require('goog.debug.Error');
+goog.require('goog.object');
+goog.require('goog.string');
+
+
+
+/**
+ * A filesystem error. Since the filesystem API is asynchronous, stack traces
+ * are less useful for identifying where errors come from, so this includes a
+ * large amount of metadata in the message.
+ *
+ * @param {!DOMError} error
+ * @param {string} action The action being undertaken when the error was raised.
+ * @constructor
+ * @extends {goog.debug.Error}
+ * @final
+ */
+goog.fs.Error = function(error, action) {
+  /** @type {string} */
+  this.name;
+
+  /**
+   * @type {goog.fs.Error.ErrorCode}
+   * @deprecated Use the 'name' or 'message' field instead.
+   */
+  this.code;
+
+  if (goog.isDef(error.name)) {
+    this.name = error.name;
+    // TODO(user): Remove warning suppression after JSCompiler stops
+    // firing a spurious warning here.
+    /** @suppress {deprecated} */
+    this.code = goog.fs.Error.getCodeFromName_(error.name);
+  } else {
+    this.code = error.code;
+    this.name = goog.fs.Error.getNameFromCode_(error.code);
+  }
+  goog.fs.Error.base(this, 'constructor',
+      goog.string.subs('%s %s', this.name, action));
+};
+goog.inherits(goog.fs.Error, goog.debug.Error);
+
+
+/**
+ * Names of errors that may be thrown by the File API, the File System API, or
+ * the File Writer API.
+ *
+ * @see http://dev.w3.org/2006/webapi/FileAPI/#ErrorAndException
+ * @see http://www.w3.org/TR/file-system-api/#definitions
+ * @see http://dev.w3.org/2009/dap/file-system/file-writer.html#definitions
+ * @enum {string}
+ */
+goog.fs.Error.ErrorName = {
+  ABORT: 'AbortError',
+  ENCODING: 'EncodingError',
+  INVALID_MODIFICATION: 'InvalidModificationError',
+  INVALID_STATE: 'InvalidStateError',
+  NOT_FOUND: 'NotFoundError',
+  NOT_READABLE: 'NotReadableError',
+  NO_MODIFICATION_ALLOWED: 'NoModificationAllowedError',
+  PATH_EXISTS: 'PathExistsError',
+  QUOTA_EXCEEDED: 'QuotaExceededError',
+  SECURITY: 'SecurityError',
+  SYNTAX: 'SyntaxError',
+  TYPE_MISMATCH: 'TypeMismatchError'
+};
+
+
+/**
+ * Error codes for file errors.
+ * @see http://www.w3.org/TR/file-system-api/#idl-def-FileException
+ *
+ * @enum {number}
+ * @deprecated Use the 'name' or 'message' attribute instead.
+ */
+goog.fs.Error.ErrorCode = {
+  NOT_FOUND: 1,
+  SECURITY: 2,
+  ABORT: 3,
+  NOT_READABLE: 4,
+  ENCODING: 5,
+  NO_MODIFICATION_ALLOWED: 6,
+  INVALID_STATE: 7,
+  SYNTAX: 8,
+  INVALID_MODIFICATION: 9,
+  QUOTA_EXCEEDED: 10,
+  TYPE_MISMATCH: 11,
+  PATH_EXISTS: 12
+};
+
+
+/**
+ * @param {goog.fs.Error.ErrorCode} code
+ * @return {string} name
+ * @private
+ */
+goog.fs.Error.getNameFromCode_ = function(code) {
+  var name = goog.object.findKey(goog.fs.Error.NameToCodeMap_, function(c) {
+    return code == c;
+  });
+  if (!goog.isDef(name)) {
+    throw new Error('Invalid code: ' + code);
+  }
+  return name;
+};
+
+
+/**
+ * Returns the code that corresponds to the given name.
+ * @param {string} name
+ * @return {goog.fs.Error.ErrorCode} code
+ * @private
+ */
+goog.fs.Error.getCodeFromName_ = function(name) {
+  return goog.fs.Error.NameToCodeMap_[name];
+};
+
+
+/**
+ * Mapping from error names to values from the ErrorCode enum.
+ * @see http://www.w3.org/TR/file-system-api/#definitions.
+ * @private {!Object<string, goog.fs.Error.ErrorCode>}
+ */
+goog.fs.Error.NameToCodeMap_ = goog.object.create(
+    goog.fs.Error.ErrorName.ABORT,
+    goog.fs.Error.ErrorCode.ABORT,
+
+    goog.fs.Error.ErrorName.ENCODING,
+    goog.fs.Error.ErrorCode.ENCODING,
+
+    goog.fs.Error.ErrorName.INVALID_MODIFICATION,
+    goog.fs.Error.ErrorCode.INVALID_MODIFICATION,
+
+    goog.fs.Error.ErrorName.INVALID_STATE,
+    goog.fs.Error.ErrorCode.INVALID_STATE,
+
+    goog.fs.Error.ErrorName.NOT_FOUND,
+    goog.fs.Error.ErrorCode.NOT_FOUND,
+
+    goog.fs.Error.ErrorName.NOT_READABLE,
+    goog.fs.Error.ErrorCode.NOT_READABLE,
+
+    goog.fs.Error.ErrorName.NO_MODIFICATION_ALLOWED,
+    goog.fs.Error.ErrorCode.NO_MODIFICATION_ALLOWED,
+
+    goog.fs.Error.ErrorName.PATH_EXISTS,
+    goog.fs.Error.ErrorCode.PATH_EXISTS,
+
+    goog.fs.Error.ErrorName.QUOTA_EXCEEDED,
+    goog.fs.Error.ErrorCode.QUOTA_EXCEEDED,
+
+    goog.fs.Error.ErrorName.SECURITY,
+    goog.fs.Error.ErrorCode.SECURITY,
+
+    goog.fs.Error.ErrorName.SYNTAX,
+    goog.fs.Error.ErrorCode.SYNTAX,
+
+    goog.fs.Error.ErrorName.TYPE_MISMATCH,
+    goog.fs.Error.ErrorCode.TYPE_MISMATCH);
+
+// Copyright 2011 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview A wrapper for the HTML5 File ProgressEvent objects.
+ *
+ */
+goog.provide('goog.fs.ProgressEvent');
+
+goog.require('goog.events.Event');
+
+
+
+/**
+ * A wrapper for the progress events emitted by the File APIs.
+ *
+ * @param {!ProgressEvent} event The underlying event object.
+ * @param {!Object} target The file access object emitting the event.
+ * @extends {goog.events.Event}
+ * @constructor
+ * @final
+ */
+goog.fs.ProgressEvent = function(event, target) {
+  goog.fs.ProgressEvent.base(this, 'constructor', event.type, target);
+
+  /**
+   * The underlying event object.
+   * @type {!ProgressEvent}
+   * @private
+   */
+  this.event_ = event;
+};
+goog.inherits(goog.fs.ProgressEvent, goog.events.Event);
+
+
+/**
+ * @return {boolean} Whether or not the total size of the of the file being
+ *     saved is known.
+ */
+goog.fs.ProgressEvent.prototype.isLengthComputable = function() {
+  return this.event_.lengthComputable;
+};
+
+
+/**
+ * @return {number} The number of bytes saved so far.
+ */
+goog.fs.ProgressEvent.prototype.getLoaded = function() {
+  return this.event_.loaded;
+};
+
+
+/**
+ * @return {number} The total number of bytes in the file being saved.
+ */
+goog.fs.ProgressEvent.prototype.getTotal = function() {
+  return this.event_.total;
+};
+
+// Copyright 2011 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview A wrapper for the HTML5 FileReader object.
+ *
+ */
+
+goog.provide('goog.fs.FileReader');
+goog.provide('goog.fs.FileReader.EventType');
+goog.provide('goog.fs.FileReader.ReadyState');
+
+goog.require('goog.async.Deferred');
+goog.require('goog.events.EventTarget');
+goog.require('goog.fs.Error');
+goog.require('goog.fs.ProgressEvent');
+
+
+
+/**
+ * An object for monitoring the reading of files. This emits ProgressEvents of
+ * the types listed in {@link goog.fs.FileReader.EventType}.
+ *
+ * @constructor
+ * @extends {goog.events.EventTarget}
+ * @final
+ */
+goog.fs.FileReader = function() {
+  goog.fs.FileReader.base(this, 'constructor');
+
+  /**
+   * The underlying FileReader object.
+   *
+   * @type {!FileReader}
+   * @private
+   */
+  this.reader_ = new FileReader();
+
+  this.reader_.onloadstart = goog.bind(this.dispatchProgressEvent_, this);
+  this.reader_.onprogress = goog.bind(this.dispatchProgressEvent_, this);
+  this.reader_.onload = goog.bind(this.dispatchProgressEvent_, this);
+  this.reader_.onabort = goog.bind(this.dispatchProgressEvent_, this);
+  this.reader_.onerror = goog.bind(this.dispatchProgressEvent_, this);
+  this.reader_.onloadend = goog.bind(this.dispatchProgressEvent_, this);
+};
+goog.inherits(goog.fs.FileReader, goog.events.EventTarget);
+
+
+/**
+ * Possible states for a FileReader.
+ *
+ * @enum {number}
+ */
+goog.fs.FileReader.ReadyState = {
+  /**
+   * The object has been constructed, but there is no pending read.
+   */
+  INIT: 0,
+  /**
+   * Data is being read.
+   */
+  LOADING: 1,
+  /**
+   * The data has been read from the file, the read was aborted, or an error
+   * occurred.
+   */
+  DONE: 2
+};
+
+
+/**
+ * Events emitted by a FileReader.
+ *
+ * @enum {string}
+ */
+goog.fs.FileReader.EventType = {
+  /**
+   * Emitted when the reading begins. readyState will be LOADING.
+   */
+  LOAD_START: 'loadstart',
+  /**
+   * Emitted when progress has been made in reading the file. readyState will be
+   * LOADING.
+   */
+  PROGRESS: 'progress',
+  /**
+   * Emitted when the data has been successfully read. readyState will be
+   * LOADING.
+   */
+  LOAD: 'load',
+  /**
+   * Emitted when the reading has been aborted. readyState will be LOADING.
+   */
+  ABORT: 'abort',
+  /**
+   * Emitted when an error is encountered or the reading has been aborted.
+   * readyState will be LOADING.
+   */
+  ERROR: 'error',
+  /**
+   * Emitted when the reading is finished, whether successfully or not.
+   * readyState will be DONE.
+   */
+  LOAD_END: 'loadend'
+};
+
+
+/**
+ * Abort the reading of the file.
+ */
+goog.fs.FileReader.prototype.abort = function() {
+  try {
+    this.reader_.abort();
+  } catch (e) {
+    throw new goog.fs.Error(e, 'aborting read');
+  }
+};
+
+
+/**
+ * @return {goog.fs.FileReader.ReadyState} The current state of the FileReader.
+ */
+goog.fs.FileReader.prototype.getReadyState = function() {
+  return /** @type {goog.fs.FileReader.ReadyState} */ (this.reader_.readyState);
+};
+
+
+/**
+ * @return {*} The result of the file read.
+ */
+goog.fs.FileReader.prototype.getResult = function() {
+  return this.reader_.result;
+};
+
+
+/**
+ * @return {goog.fs.Error} The error encountered while reading, if any.
+ */
+goog.fs.FileReader.prototype.getError = function() {
+  return this.reader_.error &&
+      new goog.fs.Error(this.reader_.error, 'reading file');
+};
+
+
+/**
+ * Wrap a progress event emitted by the underlying file reader and re-emit it.
+ *
+ * @param {!ProgressEvent} event The underlying event.
+ * @private
+ */
+goog.fs.FileReader.prototype.dispatchProgressEvent_ = function(event) {
+  this.dispatchEvent(new goog.fs.ProgressEvent(event, this));
+};
+
+
+/** @override */
+goog.fs.FileReader.prototype.disposeInternal = function() {
+  goog.fs.FileReader.base(this, 'disposeInternal');
+  delete this.reader_;
+};
+
+
+/**
+ * Starts reading a blob as a binary string.
+ * @param {!Blob} blob The blob to read.
+ */
+goog.fs.FileReader.prototype.readAsBinaryString = function(blob) {
+  this.reader_.readAsBinaryString(blob);
+};
+
+
+/**
+ * Reads a blob as a binary string.
+ * @param {!Blob} blob The blob to read.
+ * @return {!goog.async.Deferred} The deferred Blob contents as a binary string.
+ *     If an error occurs, the errback is called with a {@link goog.fs.Error}.
+ */
+goog.fs.FileReader.readAsBinaryString = function(blob) {
+  var reader = new goog.fs.FileReader();
+  var d = goog.fs.FileReader.createDeferred_(reader);
+  reader.readAsBinaryString(blob);
+  return d;
+};
+
+
+/**
+ * Starts reading a blob as an array buffer.
+ * @param {!Blob} blob The blob to read.
+ */
+goog.fs.FileReader.prototype.readAsArrayBuffer = function(blob) {
+  this.reader_.readAsArrayBuffer(blob);
+};
+
+
+/**
+ * Reads a blob as an array buffer.
+ * @param {!Blob} blob The blob to read.
+ * @return {!goog.async.Deferred} The deferred Blob contents as an array buffer.
+ *     If an error occurs, the errback is called with a {@link goog.fs.Error}.
+ */
+goog.fs.FileReader.readAsArrayBuffer = function(blob) {
+  var reader = new goog.fs.FileReader();
+  var d = goog.fs.FileReader.createDeferred_(reader);
+  reader.readAsArrayBuffer(blob);
+  return d;
+};
+
+
+/**
+ * Starts reading a blob as text.
+ * @param {!Blob} blob The blob to read.
+ * @param {string=} opt_encoding The name of the encoding to use.
+ */
+goog.fs.FileReader.prototype.readAsText = function(blob, opt_encoding) {
+  this.reader_.readAsText(blob, opt_encoding);
+};
+
+
+/**
+ * Reads a blob as text.
+ * @param {!Blob} blob The blob to read.
+ * @param {string=} opt_encoding The name of the encoding to use.
+ * @return {!goog.async.Deferred} The deferred Blob contents as text.
+ *     If an error occurs, the errback is called with a {@link goog.fs.Error}.
+ */
+goog.fs.FileReader.readAsText = function(blob, opt_encoding) {
+  var reader = new goog.fs.FileReader();
+  var d = goog.fs.FileReader.createDeferred_(reader);
+  reader.readAsText(blob, opt_encoding);
+  return d;
+};
+
+
+/**
+ * Starts reading a blob as a data URL.
+ * @param {!Blob} blob The blob to read.
+ */
+goog.fs.FileReader.prototype.readAsDataUrl = function(blob) {
+  this.reader_.readAsDataURL(blob);
+};
+
+
+/**
+ * Reads a blob as a data URL.
+ * @param {!Blob} blob The blob to read.
+ * @return {!goog.async.Deferred} The deferred Blob contents as a data URL.
+ *     If an error occurs, the errback is called with a {@link goog.fs.Error}.
+ */
+goog.fs.FileReader.readAsDataUrl = function(blob) {
+  var reader = new goog.fs.FileReader();
+  var d = goog.fs.FileReader.createDeferred_(reader);
+  reader.readAsDataUrl(blob);
+  return d;
+};
+
+
+/**
+ * Creates a new deferred object for the results of a read method.
+ * @param {goog.fs.FileReader} reader The reader to create a deferred for.
+ * @return {!goog.async.Deferred} The deferred results.
+ * @private
+ */
+goog.fs.FileReader.createDeferred_ = function(reader) {
+  var deferred = new goog.async.Deferred();
+  reader.listen(goog.fs.FileReader.EventType.LOAD_END,
+      goog.partial(function(d, r, e) {
+        var result = r.getResult();
+        var error = r.getError();
+        if (result != null && !error) {
+          d.callback(result);
+        } else {
+          d.errback(error);
+        }
+        r.dispose();
+      }, deferred, reader));
+  return deferred;
+};
+
+// FIXME should handle all geo-referenced data, not just vector data
+
+goog.provide('ol.interaction.DragAndDrop');
+goog.provide('ol.interaction.DragAndDropEvent');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.Event');
+goog.require('goog.events.FileDropHandler');
+goog.require('goog.events.FileDropHandler.EventType');
+goog.require('goog.fs.FileReader');
+goog.require('goog.functions');
+goog.require('ol.interaction.Interaction');
+goog.require('ol.proj');
+
+
+
+/**
+ * @classdesc
+ * Handles input of vector data by drag and drop.
+ *
+ * @constructor
+ * @extends {ol.interaction.Interaction}
+ * @fires ol.interaction.DragAndDropEvent
+ * @param {olx.interaction.DragAndDropOptions=} opt_options Options.
+ * @api stable
+ */
+ol.interaction.DragAndDrop = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  goog.base(this, {
+    handleEvent: ol.interaction.DragAndDrop.handleEvent
+  });
+
+  /**
+   * @private
+   * @type {Array.<function(new: ol.format.Feature)>}
+   */
+  this.formatConstructors_ = options.formatConstructors ?
+      options.formatConstructors : [];
+
+  /**
+   * @private
+   * @type {ol.proj.Projection}
+   */
+  this.projection_ = options.projection ?
+      ol.proj.get(options.projection) : null;
+
+  /**
+   * @private
+   * @type {goog.events.FileDropHandler}
+   */
+  this.fileDropHandler_ = null;
+
+  /**
+   * @private
+   * @type {goog.events.Key|undefined}
+   */
+  this.dropListenKey_ = undefined;
+
+};
+goog.inherits(ol.interaction.DragAndDrop, ol.interaction.Interaction);
+
+
+/**
+ * @inheritDoc
+ */
+ol.interaction.DragAndDrop.prototype.disposeInternal = function() {
+  if (this.dropListenKey_) {
+    goog.events.unlistenByKey(this.dropListenKey_);
+  }
+  goog.base(this, 'disposeInternal');
+};
+
+
+/**
+ * @param {goog.events.BrowserEvent} event Event.
+ * @private
+ */
+ol.interaction.DragAndDrop.prototype.handleDrop_ = function(event) {
+  var files = event.getBrowserEvent().dataTransfer.files;
+  var i, ii, file;
+  for (i = 0, ii = files.length; i < ii; ++i) {
+    file = files[i];
+    // The empty string param is a workaround for
+    // https://code.google.com/p/closure-library/issues/detail?id=524
+    var reader = goog.fs.FileReader.readAsText(file, '');
+    reader.addCallback(goog.partial(this.handleResult_, file), this);
+  }
+};
+
+
+/**
+ * @param {File} file File.
+ * @param {string} result Result.
+ * @private
+ */
+ol.interaction.DragAndDrop.prototype.handleResult_ = function(file, result) {
+  var map = this.getMap();
+  goog.asserts.assert(map, 'map must be set');
+  var projection = this.projection_;
+  if (!projection) {
+    var view = map.getView();
+    goog.asserts.assert(view, 'map must have view');
+    projection = view.getProjection();
+    goog.asserts.assert(projection !== undefined,
+        'projection should be defined');
+  }
+  var formatConstructors = this.formatConstructors_;
+  var features = [];
+  var i, ii;
+  for (i = 0, ii = formatConstructors.length; i < ii; ++i) {
+    var formatConstructor = formatConstructors[i];
+    var format = new formatConstructor();
+    var readFeatures = this.tryReadFeatures_(format, result);
+    if (readFeatures) {
+      var featureProjection = format.readProjection(result);
+      var transform = ol.proj.getTransform(featureProjection, projection);
+      var j, jj;
+      for (j = 0, jj = readFeatures.length; j < jj; ++j) {
+        var feature = readFeatures[j];
+        var geometry = feature.getGeometry();
+        if (geometry) {
+          geometry.applyTransform(transform);
+        }
+        features.push(feature);
+      }
+    }
+  }
+  this.dispatchEvent(
+      new ol.interaction.DragAndDropEvent(
+          ol.interaction.DragAndDropEventType.ADD_FEATURES, this, file,
+          features, projection));
+};
+
+
+/**
+ * Handles the {@link ol.MapBrowserEvent map browser event} unconditionally and
+ * neither prevents the browser default nor stops event propagation.
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} `false` to stop event propagation.
+ * @this {ol.interaction.DragAndDrop}
+ * @api
+ */
+ol.interaction.DragAndDrop.handleEvent = goog.functions.TRUE;
+
+
+/**
+ * @inheritDoc
+ */
+ol.interaction.DragAndDrop.prototype.setMap = function(map) {
+  if (this.dropListenKey_) {
+    goog.events.unlistenByKey(this.dropListenKey_);
+    this.dropListenKey_ = undefined;
+  }
+  if (this.fileDropHandler_) {
+    goog.dispose(this.fileDropHandler_);
+    this.fileDropHandler_ = null;
+  }
+  goog.asserts.assert(this.dropListenKey_ === undefined,
+      'this.dropListenKey_ should be undefined');
+  goog.base(this, 'setMap', map);
+  if (map) {
+    this.fileDropHandler_ = new goog.events.FileDropHandler(map.getViewport());
+    this.dropListenKey_ = goog.events.listen(
+        this.fileDropHandler_, goog.events.FileDropHandler.EventType.DROP,
+        this.handleDrop_, false, this);
+  }
+};
+
+
+/**
+ * @param {ol.format.Feature} format Format.
+ * @param {string} text Text.
+ * @private
+ * @return {Array.<ol.Feature>} Features.
+ */
+ol.interaction.DragAndDrop.prototype.tryReadFeatures_ = function(format, text) {
+  try {
+    return format.readFeatures(text);
+  } catch (e) {
+    return null;
+  }
+};
+
+
+/**
+ * @enum {string}
+ */
+ol.interaction.DragAndDropEventType = {
+  /**
+   * Triggered when features are added
+   * @event ol.interaction.DragAndDropEvent#addfeatures
+   * @api stable
+   */
+  ADD_FEATURES: 'addfeatures'
+};
+
+
+
+/**
+ * @classdesc
+ * Events emitted by {@link ol.interaction.DragAndDrop} instances are instances
+ * of this type.
+ *
+ * @constructor
+ * @extends {goog.events.Event}
+ * @implements {oli.interaction.DragAndDropEvent}
+ * @param {ol.interaction.DragAndDropEventType} type Type.
+ * @param {Object} target Target.
+ * @param {File} file File.
+ * @param {Array.<ol.Feature>=} opt_features Features.
+ * @param {ol.proj.Projection=} opt_projection Projection.
+ */
+ol.interaction.DragAndDropEvent =
+    function(type, target, file, opt_features, opt_projection) {
+
+  goog.base(this, type, target);
+
+  /**
+   * The features parsed from dropped data.
+   * @type {Array.<ol.Feature>|undefined}
+   * @api stable
+   */
+  this.features = opt_features;
+
+  /**
+   * The dropped file.
+   * @type {File}
+   * @api stable
+   */
+  this.file = file;
+
+  /**
+   * The feature projection.
+   * @type {ol.proj.Projection|undefined}
+   * @api
+   */
+  this.projection = opt_projection;
+
+};
+goog.inherits(ol.interaction.DragAndDropEvent, goog.events.Event);
+
+// Copyright 2007 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Defines a 2-element vector class that can be used for
+ * coordinate math, useful for animation systems and point manipulation.
+ *
+ * Vec2 objects inherit from goog.math.Coordinate and may be used wherever a
+ * Coordinate is required. Where appropriate, Vec2 functions accept both Vec2
+ * and Coordinate objects as input.
+ *
+ * @author brenneman@google.com (Shawn Brenneman)
+ */
+
+goog.provide('goog.math.Vec2');
+
+goog.require('goog.math');
+goog.require('goog.math.Coordinate');
+
+
+
+/**
+ * Class for a two-dimensional vector object and assorted functions useful for
+ * manipulating points.
+ *
+ * @param {number} x The x coordinate for the vector.
+ * @param {number} y The y coordinate for the vector.
+ * @struct
+ * @constructor
+ * @extends {goog.math.Coordinate}
+ */
+goog.math.Vec2 = function(x, y) {
+  /**
+   * X-value
+   * @type {number}
+   */
+  this.x = x;
+
+  /**
+   * Y-value
+   * @type {number}
+   */
+  this.y = y;
+};
+goog.inherits(goog.math.Vec2, goog.math.Coordinate);
+
+
+/**
+ * @return {!goog.math.Vec2} A random unit-length vector.
+ */
+goog.math.Vec2.randomUnit = function() {
+  var angle = Math.random() * Math.PI * 2;
+  return new goog.math.Vec2(Math.cos(angle), Math.sin(angle));
+};
+
+
+/**
+ * @return {!goog.math.Vec2} A random vector inside the unit-disc.
+ */
+goog.math.Vec2.random = function() {
+  var mag = Math.sqrt(Math.random());
+  var angle = Math.random() * Math.PI * 2;
+
+  return new goog.math.Vec2(Math.cos(angle) * mag, Math.sin(angle) * mag);
+};
+
+
+/**
+ * Returns a new Vec2 object from a given coordinate.
+ * @param {!goog.math.Coordinate} a The coordinate.
+ * @return {!goog.math.Vec2} A new vector object.
+ */
+goog.math.Vec2.fromCoordinate = function(a) {
+  return new goog.math.Vec2(a.x, a.y);
+};
+
+
+/**
+ * @return {!goog.math.Vec2} A new vector with the same coordinates as this one.
+ * @override
+ */
+goog.math.Vec2.prototype.clone = function() {
+  return new goog.math.Vec2(this.x, this.y);
+};
+
+
+/**
+ * Returns the magnitude of the vector measured from the origin.
+ * @return {number} The length of the vector.
+ */
+goog.math.Vec2.prototype.magnitude = function() {
+  return Math.sqrt(this.x * this.x + this.y * this.y);
+};
+
+
+/**
+ * Returns the squared magnitude of the vector measured from the origin.
+ * NOTE(brenneman): Leaving out the square root is not a significant
+ * optimization in JavaScript.
+ * @return {number} The length of the vector, squared.
+ */
+goog.math.Vec2.prototype.squaredMagnitude = function() {
+  return this.x * this.x + this.y * this.y;
+};
+
+
+/**
+ * @return {!goog.math.Vec2} This coordinate after scaling.
+ * @override
+ */
+goog.math.Vec2.prototype.scale =
+    /** @type {function(number, number=):!goog.math.Vec2} */
+    (goog.math.Coordinate.prototype.scale);
+
+
+/**
+ * Reverses the sign of the vector. Equivalent to scaling the vector by -1.
+ * @return {!goog.math.Vec2} The inverted vector.
+ */
+goog.math.Vec2.prototype.invert = function() {
+  this.x = -this.x;
+  this.y = -this.y;
+  return this;
+};
+
+
+/**
+ * Normalizes the current vector to have a magnitude of 1.
+ * @return {!goog.math.Vec2} The normalized vector.
+ */
+goog.math.Vec2.prototype.normalize = function() {
+  return this.scale(1 / this.magnitude());
+};
+
+
+/**
+ * Adds another vector to this vector in-place.
+ * @param {!goog.math.Coordinate} b The vector to add.
+ * @return {!goog.math.Vec2}  This vector with {@code b} added.
+ */
+goog.math.Vec2.prototype.add = function(b) {
+  this.x += b.x;
+  this.y += b.y;
+  return this;
+};
+
+
+/**
+ * Subtracts another vector from this vector in-place.
+ * @param {!goog.math.Coordinate} b The vector to subtract.
+ * @return {!goog.math.Vec2} This vector with {@code b} subtracted.
+ */
+goog.math.Vec2.prototype.subtract = function(b) {
+  this.x -= b.x;
+  this.y -= b.y;
+  return this;
+};
+
+
+/**
+ * Rotates this vector in-place by a given angle, specified in radians.
+ * @param {number} angle The angle, in radians.
+ * @return {!goog.math.Vec2} This vector rotated {@code angle} radians.
+ */
+goog.math.Vec2.prototype.rotate = function(angle) {
+  var cos = Math.cos(angle);
+  var sin = Math.sin(angle);
+  var newX = this.x * cos - this.y * sin;
+  var newY = this.y * cos + this.x * sin;
+  this.x = newX;
+  this.y = newY;
+  return this;
+};
+
+
+/**
+ * Rotates a vector by a given angle, specified in radians, relative to a given
+ * axis rotation point. The returned vector is a newly created instance - no
+ * in-place changes are done.
+ * @param {!goog.math.Vec2} v A vector.
+ * @param {!goog.math.Vec2} axisPoint The rotation axis point.
+ * @param {number} angle The angle, in radians.
+ * @return {!goog.math.Vec2} The rotated vector in a newly created instance.
+ */
+goog.math.Vec2.rotateAroundPoint = function(v, axisPoint, angle) {
+  var res = v.clone();
+  return res.subtract(axisPoint).rotate(angle).add(axisPoint);
+};
+
+
+/**
+ * Compares this vector with another for equality.
+ * @param {!goog.math.Vec2} b The other vector.
+ * @return {boolean} Whether this vector has the same x and y as the given
+ *     vector.
+ */
+goog.math.Vec2.prototype.equals = function(b) {
+  return this == b || !!b && this.x == b.x && this.y == b.y;
+};
+
+
+/**
+ * Returns the distance between two vectors.
+ * @param {!goog.math.Coordinate} a The first vector.
+ * @param {!goog.math.Coordinate} b The second vector.
+ * @return {number} The distance.
+ */
+goog.math.Vec2.distance = goog.math.Coordinate.distance;
+
+
+/**
+ * Returns the squared distance between two vectors.
+ * @param {!goog.math.Coordinate} a The first vector.
+ * @param {!goog.math.Coordinate} b The second vector.
+ * @return {number} The squared distance.
+ */
+goog.math.Vec2.squaredDistance = goog.math.Coordinate.squaredDistance;
+
+
+/**
+ * Compares vectors for equality.
+ * @param {!goog.math.Coordinate} a The first vector.
+ * @param {!goog.math.Coordinate} b The second vector.
+ * @return {boolean} Whether the vectors have the same x and y coordinates.
+ */
+goog.math.Vec2.equals = goog.math.Coordinate.equals;
+
+
+/**
+ * Returns the sum of two vectors as a new Vec2.
+ * @param {!goog.math.Coordinate} a The first vector.
+ * @param {!goog.math.Coordinate} b The second vector.
+ * @return {!goog.math.Vec2} The sum vector.
+ */
+goog.math.Vec2.sum = function(a, b) {
+  return new goog.math.Vec2(a.x + b.x, a.y + b.y);
+};
+
+
+/**
+ * Returns the difference between two vectors as a new Vec2.
+ * @param {!goog.math.Coordinate} a The first vector.
+ * @param {!goog.math.Coordinate} b The second vector.
+ * @return {!goog.math.Vec2} The difference vector.
+ */
+goog.math.Vec2.difference = function(a, b) {
+  return new goog.math.Vec2(a.x - b.x, a.y - b.y);
+};
+
+
+/**
+ * Returns the dot-product of two vectors.
+ * @param {!goog.math.Coordinate} a The first vector.
+ * @param {!goog.math.Coordinate} b The second vector.
+ * @return {number} The dot-product of the two vectors.
+ */
+goog.math.Vec2.dot = function(a, b) {
+  return a.x * b.x + a.y * b.y;
+};
+
+
+/**
+ * Returns the determinant of two vectors.
+ * @param {!goog.math.Vec2} a The first vector.
+ * @param {!goog.math.Vec2} b The second vector.
+ * @return {number} The determinant of the two vectors.
+ */
+goog.math.Vec2.determinant = function(a, b) {
+  return a.x * b.y - a.y * b.x;
+};
+
+
+/**
+ * Returns a new Vec2 that is the linear interpolant between vectors a and b at
+ * scale-value x.
+ * @param {!goog.math.Coordinate} a Vector a.
+ * @param {!goog.math.Coordinate} b Vector b.
+ * @param {number} x The proportion between a and b.
+ * @return {!goog.math.Vec2} The interpolated vector.
+ */
+goog.math.Vec2.lerp = function(a, b, x) {
+  return new goog.math.Vec2(goog.math.lerp(a.x, b.x, x),
+                            goog.math.lerp(a.y, b.y, x));
+};
+
+goog.provide('ol.interaction.DragRotateAndZoom');
+
+goog.require('goog.math.Vec2');
+goog.require('ol');
+goog.require('ol.ViewHint');
+goog.require('ol.events.ConditionType');
+goog.require('ol.events.condition');
+goog.require('ol.interaction.Interaction');
+goog.require('ol.interaction.Pointer');
+
+
+
+/**
+ * @classdesc
+ * Allows the user to zoom and rotate the map by clicking and dragging
+ * on the map.  By default, this interaction is limited to when the shift
+ * key is held down.
+ *
+ * This interaction is only supported for mouse devices.
+ *
+ * And this interaction is not included in the default interactions.
+ *
+ * @constructor
+ * @extends {ol.interaction.Pointer}
+ * @param {olx.interaction.DragRotateAndZoomOptions=} opt_options Options.
+ * @api stable
+ */
+ol.interaction.DragRotateAndZoom = function(opt_options) {
+
+  var options = opt_options ? opt_options : {};
+
+  goog.base(this, {
+    handleDownEvent: ol.interaction.DragRotateAndZoom.handleDownEvent_,
+    handleDragEvent: ol.interaction.DragRotateAndZoom.handleDragEvent_,
+    handleUpEvent: ol.interaction.DragRotateAndZoom.handleUpEvent_
+  });
+
+  /**
+   * @private
+   * @type {ol.events.ConditionType}
+   */
+  this.condition_ = options.condition ?
+      options.condition : ol.events.condition.shiftKeyOnly;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.lastAngle_ = undefined;
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.lastMagnitude_ = undefined;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.lastScaleDelta_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.duration_ = options.duration !== undefined ? options.duration : 400;
+
+};
+goog.inherits(ol.interaction.DragRotateAndZoom, ol.interaction.Pointer);
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @this {ol.interaction.DragRotateAndZoom}
+ * @private
+ */
+ol.interaction.DragRotateAndZoom.handleDragEvent_ = function(mapBrowserEvent) {
+  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
+    return;
+  }
+
+  var map = mapBrowserEvent.map;
+  var size = map.getSize();
+  var offset = mapBrowserEvent.pixel;
+  var delta = new goog.math.Vec2(
+      offset[0] - size[0] / 2,
+      size[1] / 2 - offset[1]);
+  var theta = Math.atan2(delta.y, delta.x);
+  var magnitude = delta.magnitude();
+  var view = map.getView();
+  map.render();
+  if (this.lastAngle_ !== undefined) {
+    var angleDelta = theta - this.lastAngle_;
+    ol.interaction.Interaction.rotateWithoutConstraints(
+        map, view, view.getRotation() - angleDelta);
+  }
+  this.lastAngle_ = theta;
+  if (this.lastMagnitude_ !== undefined) {
+    var resolution = this.lastMagnitude_ * (view.getResolution() / magnitude);
+    ol.interaction.Interaction.zoomWithoutConstraints(map, view, resolution);
+  }
+  if (this.lastMagnitude_ !== undefined) {
+    this.lastScaleDelta_ = this.lastMagnitude_ / magnitude;
+  }
+  this.lastMagnitude_ = magnitude;
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @return {boolean} Stop drag sequence?
+ * @this {ol.interaction.DragRotateAndZoom}
+ * @private
+ */
+ol.interaction.DragRotateAndZoom.handleUpEvent_ = function(mapBrowserEvent) {
+  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
+    return true;
+  }
+
+  var map = mapBrowserEvent.map;
+  var view = map.getView();
+  view.setHint(ol.ViewHint.INTERACTING, -1);
+  var direction = this.lastScaleDelta_ - 1;
+  ol.interaction.Interaction.rotate(map, view, view.getRotation());
+  ol.interaction.Interaction.zoom(map, view, view.getResolution(),
+      undefined, this.duration_, direction);
+  this.lastScaleDelta_ = 0;
+  return false;
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
+ * @return {boolean} Start drag sequence?
+ * @this {ol.interaction.DragRotateAndZoom}
+ * @private
+ */
+ol.interaction.DragRotateAndZoom.handleDownEvent_ = function(mapBrowserEvent) {
+  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
+    return false;
+  }
+
+  if (this.condition_(mapBrowserEvent)) {
+    mapBrowserEvent.map.getView().setHint(ol.ViewHint.INTERACTING, 1);
+    this.lastAngle_ = undefined;
+    this.lastMagnitude_ = undefined;
+    return true;
+  } else {
+    return false;
+  }
+};
+
+goog.provide('ol.interaction.Draw');
+goog.provide('ol.interaction.DrawEvent');
+goog.provide('ol.interaction.DrawEventType');
+goog.provide('ol.interaction.DrawGeometryFunctionType');
+goog.provide('ol.interaction.DrawMode');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.Event');
+goog.require('ol.Collection');
+goog.require('ol.Coordinate');
+goog.require('ol.Feature');
+goog.require('ol.MapBrowserEvent');
+goog.require('ol.MapBrowserEvent.EventType');
+goog.require('ol.Object');
+goog.require('ol.coordinate');
+goog.require('ol.events.condition');
+goog.require('ol.geom.Circle');
+goog.require('ol.geom.GeometryType');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.MultiLineString');
+goog.require('ol.geom.MultiPoint');
+goog.require('ol.geom.MultiPolygon');
+goog.require('ol.geom.Point');
+goog.require('ol.geom.Polygon');
+goog.require('ol.geom.SimpleGeometry');
+goog.require('ol.interaction.InteractionProperty');
+goog.require('ol.interaction.Pointer');
+goog.require('ol.layer.Vector');
+goog.require('ol.source.Vector');
+
+
+/**
+ * @enum {string}
+ */
+ol.interaction.DrawEventType = {
+  /**
+   * Triggered upon feature draw start
+   * @event ol.interaction.DrawEvent#drawstart
+   * @api stable
+   */
+  DRAWSTART: 'drawstart',
+  /**
+   * Triggered upon feature draw end
+   * @event ol.interaction.DrawEvent#drawend
+   * @api stable
+   */
+  DRAWEND: 'drawend'
+};
+
+
+
+/**
+ * @classdesc
+ * Events emitted by {@link ol.interaction.Draw} instances are instances of
+ * this type.
+ *
+ * @constructor
+ * @extends {goog.events.Event}
+ * @implements {oli.DrawEvent}
+ * @param {ol.interaction.DrawEventType} type Type.
+ * @param {ol.Feature} feature The feature drawn.
+ */
+ol.interaction.DrawEvent = function(type, feature) {
+
+  goog.base(this, type);
+
+  /**
+   * The feature being drawn.
+   * @type {ol.Feature}
+   * @api stable
+   */
+  this.feature = feature;
+
+};
+goog.inherits(ol.interaction.DrawEvent, goog.events.Event);
+
+
+
+/**
+ * @classdesc
+ * Interaction for drawing feature geometries.
+ *
+ * @constructor
+ * @extends {ol.interaction.Pointer}
+ * @fires ol.interaction.DrawEvent
+ * @param {olx.interaction.DrawOptions} options Options.
+ * @api stable
+ */
+ol.interaction.Draw = function(options) {
+
+  goog.base(this, {
+    handleDownEvent: ol.interaction.Draw.handleDownEvent_,
+    handleEvent: ol.interaction.Draw.handleEvent,
+    handleUpEvent: ol.interaction.Draw.handleUpEvent_
+  });
+
+  /**
+   * @type {ol.Pixel}
+   * @private
+   */
+  this.downPx_ = null;
+
+  /**
+   * @type {boolean}
+   * @private
+   */
+  this.freehand_ = false;
+
+  /**
+   * Target source for drawn features.
+   * @type {ol.source.Vector}
+   * @private
+   */
+  this.source_ = options.source ? options.source : null;
+
+  /**
+   * Target collection for drawn features.
+   * @type {ol.Collection.<ol.Feature>}
+   * @private
+   */
+  this.features_ = options.features ? options.features : null;
+
+  /**
+   * Pixel distance for snapping.
+   * @type {number}
+   * @private
+   */
+  this.snapTolerance_ = options.snapTolerance ? options.snapTolerance : 12;
+
+  /**
+   * Geometry type.
+   * @type {ol.geom.GeometryType}
+   * @private
+   */
+  this.type_ = options.type;
+
+  /**
+   * Drawing mode (derived from geometry type.
+   * @type {ol.interaction.DrawMode}
+   * @private
+   */
+  this.mode_ = ol.interaction.Draw.getMode_(this.type_);
+
+  /**
+   * The number of points that must be drawn before a polygon ring or line
+   * string can be finished.  The default is 3 for polygon rings and 2 for
+   * line strings.
+   * @type {number}
+   * @private
+   */
+  this.minPoints_ = options.minPoints ?
+      options.minPoints :
+      (this.mode_ === ol.interaction.DrawMode.POLYGON ? 3 : 2);
+
+  /**
+   * The number of points that can be drawn before a polygon ring or line string
+   * is finished. The default is no restriction.
+   * @type {number}
+   * @private
+   */
+  this.maxPoints_ = options.maxPoints ? options.maxPoints : Infinity;
+
+  var geometryFunction = options.geometryFunction;
+  if (!geometryFunction) {
+    if (this.type_ === ol.geom.GeometryType.CIRCLE) {
+      /**
+       * @param {ol.Coordinate|Array.<ol.Coordinate>|Array.<Array.<ol.Coordinate>>} coordinates
+       * @param {ol.geom.SimpleGeometry=} opt_geometry
+       * @return {ol.geom.SimpleGeometry}
+       */
+      geometryFunction = function(coordinates, opt_geometry) {
+        var circle = opt_geometry ? opt_geometry :
+            new ol.geom.Circle([NaN, NaN]);
+        goog.asserts.assertInstanceof(circle, ol.geom.Circle,
+            'geometry must be an ol.geom.Circle');
+        var squaredLength = ol.coordinate.squaredDistance(
+            coordinates[0], coordinates[1]);
+        circle.setCenterAndRadius(coordinates[0], Math.sqrt(squaredLength));
+        return circle;
+      };
+    } else {
+      var Constructor;
+      var mode = this.mode_;
+      if (mode === ol.interaction.DrawMode.POINT) {
+        Constructor = ol.geom.Point;
+      } else if (mode === ol.interaction.DrawMode.LINE_STRING) {
+        Constructor = ol.geom.LineString;
+      } else if (mode === ol.interaction.DrawMode.POLYGON) {
+        Constructor = ol.geom.Polygon;
+      }
+      /**
+       * @param {ol.Coordinate|Array.<ol.Coordinate>|Array.<Array.<ol.Coordinate>>} coordinates
+       * @param {ol.geom.SimpleGeometry=} opt_geometry
+       * @return {ol.geom.SimpleGeometry}
+       */
+      geometryFunction = function(coordinates, opt_geometry) {
+        var geometry = opt_geometry;
+        if (geometry) {
+          geometry.setCoordinates(coordinates);
+        } else {
+          geometry = new Constructor(coordinates);
+        }
+        return geometry;
+      };
+    }
+  }
+
+  /**
+   * @type {ol.interaction.DrawGeometryFunctionType}
+   * @private
+   */
+  this.geometryFunction_ = geometryFunction;
+
+  /**
+   * Finish coordinate for the feature (first point for polygons, last point for
+   * linestrings).
+   * @type {ol.Coordinate}
+   * @private
+   */
+  this.finishCoordinate_ = null;
+
+  /**
+   * Sketch feature.
+   * @type {ol.Feature}
+   * @private
+   */
+  this.sketchFeature_ = null;
+
+  /**
+   * Sketch point.
+   * @type {ol.Feature}
+   * @private
+   */
+  this.sketchPoint_ = null;
+
+  /**
+   * Sketch coordinates. Used when drawing a line or polygon.
+   * @type {ol.Coordinate|Array.<ol.Coordinate>|Array.<Array.<ol.Coordinate>>}
+   * @private
+   */
+  this.sketchCoords_ = null;
+
+  /**
+   * Sketch line. Used when drawing polygon.
+   * @type {ol.Feature}
+   * @private
+   */
+  this.sketchLine_ = null;
+
+  /**
+   * Sketch line coordinates. Used when drawing a polygon or circle.
+   * @type {Array.<ol.Coordinate>}
+   * @private
+   */
+  this.sketchLineCoords_ = null;
+
+  /**
+   * Squared tolerance for handling up events.  If the squared distance
+   * between a down and up event is greater than this tolerance, up events
+   * will not be handled.
+   * @type {number}
+   * @private
+   */
+  this.squaredClickTolerance_ = options.clickTolerance ?
+      options.clickTolerance * options.clickTolerance : 36;
+
+  /**
+   * Draw overlay where our sketch features are drawn.
+   * @type {ol.layer.Vector}
+   * @private
+   */
+  this.overlay_ = new ol.layer.Vector({
+    source: new ol.source.Vector({
+      useSpatialIndex: false,
+      wrapX: options.wrapX ? options.wrapX : false
+    }),
+    style: options.style ? options.style :
+        ol.interaction.Draw.getDefaultStyleFunction()
+  });
+
+  /**
+   * Name of the geometry attribute for newly created features.
+   * @type {string|undefined}
+   * @private
+   */
+  this.geometryName_ = options.geometryName;
+
+  /**
+   * @private
+   * @type {ol.events.ConditionType}
+   */
+  this.condition_ = options.condition ?
+      options.condition : ol.events.condition.noModifierKeys;
+
+  /**
+   * @private
+   * @type {ol.events.ConditionType}
+   */
+  this.freehandCondition_ = options.freehandCondition ?
+      options.freehandCondition : ol.events.condition.shiftKeyOnly;
+
+  goog.events.listen(this,
+      ol.Object.getChangeEventType(ol.interaction.InteractionProperty.ACTIVE),
+      this.updateState_, false, this);
+
+};
+goog.inherits(ol.interaction.Draw, ol.interaction.Pointer);
+
+
+/**
+ * @return {ol.style.StyleFunction} Styles.
+ */
+ol.interaction.Draw.getDefaultStyleFunction = function() {
+  var styles = ol.style.createDefaultEditingStyles();
+  return function(feature, resolution) {
+    return styles[feature.getGeometry().getType()];
+  };
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.interaction.Draw.prototype.setMap = function(map) {
+  goog.base(this, 'setMap', map);
+  this.updateState_();
+};
+
+
+/**
+ * Handles the {@link ol.MapBrowserEvent map browser event} and may actually
+ * draw or finish the drawing.
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} `false` to stop event propagation.
+ * @this {ol.interaction.Draw}
+ * @api
+ */
+ol.interaction.Draw.handleEvent = function(mapBrowserEvent) {
+  var pass = !this.freehand_;
+  if (this.freehand_ &&
+      mapBrowserEvent.type === ol.MapBrowserEvent.EventType.POINTERDRAG) {
+    this.addToDrawing_(mapBrowserEvent);
+    pass = false;
+  } else if (mapBrowserEvent.type ===
+      ol.MapBrowserEvent.EventType.POINTERMOVE) {
+    pass = this.handlePointerMove_(mapBrowserEvent);
+  } else if (mapBrowserEvent.type === ol.MapBrowserEvent.EventType.DBLCLICK) {
+    pass = false;
+  }
+  return ol.interaction.Pointer.handleEvent.call(this, mapBrowserEvent) && pass;
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} event Event.
+ * @return {boolean} Start drag sequence?
+ * @this {ol.interaction.Draw}
+ * @private
+ */
+ol.interaction.Draw.handleDownEvent_ = function(event) {
+  if (this.condition_(event)) {
+    this.downPx_ = event.pixel;
+    return true;
+  } else if ((this.mode_ === ol.interaction.DrawMode.LINE_STRING ||
+      this.mode_ === ol.interaction.DrawMode.POLYGON) &&
+      this.freehandCondition_(event)) {
+    this.downPx_ = event.pixel;
+    this.freehand_ = true;
+    if (!this.finishCoordinate_) {
+      this.startDrawing_(event);
+    }
+    return true;
+  } else {
+    return false;
+  }
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} event Event.
+ * @return {boolean} Stop drag sequence?
+ * @this {ol.interaction.Draw}
+ * @private
+ */
+ol.interaction.Draw.handleUpEvent_ = function(event) {
+  this.freehand_ = false;
+  var downPx = this.downPx_;
+  var clickPx = event.pixel;
+  var dx = downPx[0] - clickPx[0];
+  var dy = downPx[1] - clickPx[1];
+  var squaredDistance = dx * dx + dy * dy;
+  var pass = true;
+  if (squaredDistance <= this.squaredClickTolerance_) {
+    this.handlePointerMove_(event);
+    if (!this.finishCoordinate_) {
+      this.startDrawing_(event);
+      if (this.mode_ === ol.interaction.DrawMode.POINT) {
+        this.finishDrawing();
+      }
+    } else if (this.mode_ === ol.interaction.DrawMode.CIRCLE) {
+      this.finishDrawing();
+    } else if (this.atFinish_(event)) {
+      this.finishDrawing();
+    } else {
+      this.addToDrawing_(event);
+    }
+    pass = false;
+  }
+  return pass;
+};
+
+
+/**
+ * Handle move events.
+ * @param {ol.MapBrowserEvent} event A move event.
+ * @return {boolean} Pass the event to other interactions.
+ * @private
+ */
+ol.interaction.Draw.prototype.handlePointerMove_ = function(event) {
+  if (this.finishCoordinate_) {
+    this.modifyDrawing_(event);
+  } else {
+    this.createOrUpdateSketchPoint_(event);
+  }
+  return true;
+};
+
+
+/**
+ * Determine if an event is within the snapping tolerance of the start coord.
+ * @param {ol.MapBrowserEvent} event Event.
+ * @return {boolean} The event is within the snapping tolerance of the start.
+ * @private
+ */
+ol.interaction.Draw.prototype.atFinish_ = function(event) {
+  var at = false;
+  if (this.sketchFeature_) {
+    var potentiallyDone = false;
+    var potentiallyFinishCoordinates = [this.finishCoordinate_];
+    if (this.mode_ === ol.interaction.DrawMode.LINE_STRING) {
+      potentiallyDone = this.sketchCoords_.length > this.minPoints_;
+    } else if (this.mode_ === ol.interaction.DrawMode.POLYGON) {
+      potentiallyDone = this.sketchCoords_[0].length >
+          this.minPoints_;
+      potentiallyFinishCoordinates = [this.sketchCoords_[0][0],
+        this.sketchCoords_[0][this.sketchCoords_[0].length - 2]];
+    }
+    if (potentiallyDone) {
+      var map = event.map;
+      for (var i = 0, ii = potentiallyFinishCoordinates.length; i < ii; i++) {
+        var finishCoordinate = potentiallyFinishCoordinates[i];
+        var finishPixel = map.getPixelFromCoordinate(finishCoordinate);
+        var pixel = event.pixel;
+        var dx = pixel[0] - finishPixel[0];
+        var dy = pixel[1] - finishPixel[1];
+        var freehand = this.freehand_ && this.freehandCondition_(event);
+        var snapTolerance = freehand ? 1 : this.snapTolerance_;
+        at = Math.sqrt(dx * dx + dy * dy) <= snapTolerance;
+        if (at) {
+          this.finishCoordinate_ = finishCoordinate;
+          break;
+        }
+      }
+    }
+  }
+  return at;
+};
+
+
+/**
+ * @param {ol.MapBrowserEvent} event Event.
+ * @private
+ */
+ol.interaction.Draw.prototype.createOrUpdateSketchPoint_ = function(event) {
+  var coordinates = event.coordinate.slice();
+  if (!this.sketchPoint_) {
+    this.sketchPoint_ = new ol.Feature(new ol.geom.Point(coordinates));
+    this.updateSketchFeatures_();
+  } else {
+    var sketchPointGeom = this.sketchPoint_.getGeometry();
+    goog.asserts.assertInstanceof(sketchPointGeom, ol.geom.Point,
+        'sketchPointGeom should be an ol.geom.Point');
+    sketchPointGeom.setCoordinates(coordinates);
+  }
+};
+
+
+/**
+ * Start the drawing.
+ * @param {ol.MapBrowserEvent} event Event.
+ * @private
+ */
+ol.interaction.Draw.prototype.startDrawing_ = function(event) {
+  var start = event.coordinate;
+  this.finishCoordinate_ = start;
+  if (this.mode_ === ol.interaction.DrawMode.POINT) {
+    this.sketchCoords_ = start.slice();
+  } else if (this.mode_ === ol.interaction.DrawMode.POLYGON) {
+    this.sketchCoords_ = [[start.slice(), start.slice()]];
+    this.sketchLineCoords_ = this.sketchCoords_[0];
+  } else {
+    this.sketchCoords_ = [start.slice(), start.slice()];
+    if (this.mode_ === ol.interaction.DrawMode.CIRCLE) {
+      this.sketchLineCoords_ = this.sketchCoords_;
+    }
+  }
+  if (this.sketchLineCoords_) {
+    this.sketchLine_ = new ol.Feature(
+        new ol.geom.LineString(this.sketchLineCoords_));
+  }
+  var geometry = this.geometryFunction_(this.sketchCoords_);
+  goog.asserts.assert(geometry !== undefined, 'geometry should be defined');
+  this.sketchFeature_ = new ol.Feature();
+  if (this.geometryName_) {
+    this.sketchFeature_.setGeometryName(this.geometryName_);
+  }
+  this.sketchFeature_.setGeometry(geometry);
+  this.updateSketchFeatures_();
+  this.dispatchEvent(new ol.interaction.DrawEvent(
+      ol.interaction.DrawEventType.DRAWSTART, this.sketchFeature_));
+};
+
+
+/**
+ * Modify the drawing.
+ * @param {ol.MapBrowserEvent} event Event.
+ * @private
+ */
+ol.interaction.Draw.prototype.modifyDrawing_ = function(event) {
+  var coordinate = event.coordinate;
+  var geometry = this.sketchFeature_.getGeometry();
+  goog.asserts.assertInstanceof(geometry, ol.geom.SimpleGeometry,
+      'geometry should be ol.geom.SimpleGeometry or subclass');
+  var coordinates, last;
+  if (this.mode_ === ol.interaction.DrawMode.POINT) {
+    last = this.sketchCoords_;
+  } else if (this.mode_ === ol.interaction.DrawMode.POLYGON) {
+    coordinates = this.sketchCoords_[0];
+    last = coordinates[coordinates.length - 1];
+    if (this.atFinish_(event)) {
+      // snap to finish
+      coordinate = this.finishCoordinate_.slice();
+    }
+  } else {
+    coordinates = this.sketchCoords_;
+    last = coordinates[coordinates.length - 1];
+  }
+  last[0] = coordinate[0];
+  last[1] = coordinate[1];
+  goog.asserts.assert(this.sketchCoords_, 'sketchCoords_ expected');
+  this.geometryFunction_(this.sketchCoords_, geometry);
+  if (this.sketchPoint_) {
+    var sketchPointGeom = this.sketchPoint_.getGeometry();
+    goog.asserts.assertInstanceof(sketchPointGeom, ol.geom.Point,
+        'sketchPointGeom should be an ol.geom.Point');
+    sketchPointGeom.setCoordinates(coordinate);
+  }
+  var sketchLineGeom;
+  if (geometry instanceof ol.geom.Polygon &&
+      this.mode_ !== ol.interaction.DrawMode.POLYGON) {
+    if (!this.sketchLine_) {
+      this.sketchLine_ = new ol.Feature(new ol.geom.LineString(null));
+    }
+    var ring = geometry.getLinearRing(0);
+    sketchLineGeom = this.sketchLine_.getGeometry();
+    goog.asserts.assertInstanceof(sketchLineGeom, ol.geom.LineString,
+        'sketchLineGeom must be an ol.geom.LineString');
+    sketchLineGeom.setFlatCoordinates(
+        ring.getLayout(), ring.getFlatCoordinates());
+  } else if (this.sketchLineCoords_) {
+    sketchLineGeom = this.sketchLine_.getGeometry();
+    goog.asserts.assertInstanceof(sketchLineGeom, ol.geom.LineString,
+        'sketchLineGeom must be an ol.geom.LineString');
+    sketchLineGeom.setCoordinates(this.sketchLineCoords_);
+  }
+  this.updateSketchFeatures_();
+};
+
+
+/**
+ * Add a new coordinate to the drawing.
+ * @param {ol.MapBrowserEvent} event Event.
+ * @private
+ */
+ol.interaction.Draw.prototype.addToDrawing_ = function(event) {
+  var coordinate = event.coordinate;
+  var geometry = this.sketchFeature_.getGeometry();
+  goog.asserts.assertInstanceof(geometry, ol.geom.SimpleGeometry,
+      'geometry must be an ol.geom.SimpleGeometry');
+  var done;
+  var coordinates;
+  if (this.mode_ === ol.interaction.DrawMode.LINE_STRING) {
+    this.finishCoordinate_ = coordinate.slice();
+    coordinates = this.sketchCoords_;
+    coordinates.push(coordinate.slice());
+    done = coordinates.length > this.maxPoints_;
+    this.geometryFunction_(coordinates, geometry);
+  } else if (this.mode_ === ol.interaction.DrawMode.POLYGON) {
+    coordinates = this.sketchCoords_[0];
+    coordinates.push(coordinate.slice());
+    done = coordinates.length > this.maxPoints_;
+    if (done) {
+      this.finishCoordinate_ = coordinates[0];
+    }
+    this.geometryFunction_(this.sketchCoords_, geometry);
+  }
+  this.updateSketchFeatures_();
+  if (done) {
+    this.finishDrawing();
+  }
+};
+
+
+/**
+ * Remove last point of the feature currently being drawn.
+ * @api
+ */
+ol.interaction.Draw.prototype.removeLastPoint = function() {
+  var geometry = this.sketchFeature_.getGeometry();
+  goog.asserts.assertInstanceof(geometry, ol.geom.SimpleGeometry,
+      'geometry must be an ol.geom.SimpleGeometry');
+  var coordinates, sketchLineGeom;
+  if (this.mode_ === ol.interaction.DrawMode.LINE_STRING) {
+    coordinates = this.sketchCoords_;
+    coordinates.splice(-2, 1);
+    this.geometryFunction_(coordinates, geometry);
+  } else if (this.mode_ === ol.interaction.DrawMode.POLYGON) {
+    coordinates = this.sketchCoords_[0];
+    coordinates.splice(-2, 1);
+    sketchLineGeom = this.sketchLine_.getGeometry();
+    goog.asserts.assertInstanceof(sketchLineGeom, ol.geom.LineString,
+        'sketchLineGeom must be an ol.geom.LineString');
+    sketchLineGeom.setCoordinates(coordinates);
+    this.geometryFunction_(this.sketchCoords_, geometry);
+  }
+
+  if (coordinates.length === 0) {
+    this.finishCoordinate_ = null;
+  }
+
+  this.updateSketchFeatures_();
+};
+
+
+/**
+ * Stop drawing and add the sketch feature to the target layer.
+ * The {@link ol.interaction.DrawEventType.DRAWEND} event is dispatched before
+ * inserting the feature.
+ * @api
+ */
+ol.interaction.Draw.prototype.finishDrawing = function() {
+  var sketchFeature = this.abortDrawing_();
+  goog.asserts.assert(sketchFeature, 'sketchFeature expected to be truthy');
+  var coordinates = this.sketchCoords_;
+  var geometry = sketchFeature.getGeometry();
+  goog.asserts.assertInstanceof(geometry, ol.geom.SimpleGeometry,
+      'geometry must be an ol.geom.SimpleGeometry');
+  if (this.mode_ === ol.interaction.DrawMode.LINE_STRING) {
+    // remove the redundant last point
+    coordinates.pop();
+    this.geometryFunction_(coordinates, geometry);
+  } else if (this.mode_ === ol.interaction.DrawMode.POLYGON) {
+    // When we finish drawing a polygon on the last point,
+    // the last coordinate is duplicated as for LineString
+    // we force the replacement by the first point
+    coordinates[0].pop();
+    coordinates[0].push(coordinates[0][0]);
+    this.geometryFunction_(coordinates, geometry);
+  }
+
+  // cast multi-part geometries
+  if (this.type_ === ol.geom.GeometryType.MULTI_POINT) {
+    sketchFeature.setGeometry(new ol.geom.MultiPoint([coordinates]));
+  } else if (this.type_ === ol.geom.GeometryType.MULTI_LINE_STRING) {
+    sketchFeature.setGeometry(new ol.geom.MultiLineString([coordinates]));
+  } else if (this.type_ === ol.geom.GeometryType.MULTI_POLYGON) {
+    sketchFeature.setGeometry(new ol.geom.MultiPolygon([coordinates]));
+  }
+
+  // First dispatch event to allow full set up of feature
+  this.dispatchEvent(new ol.interaction.DrawEvent(
+      ol.interaction.DrawEventType.DRAWEND, sketchFeature));
+
+  // Then insert feature
+  if (this.features_) {
+    this.features_.push(sketchFeature);
+  }
+  if (this.source_) {
+    this.source_.addFeature(sketchFeature);
+  }
+};
+
+
+/**
+ * Stop drawing without adding the sketch feature to the target layer.
+ * @return {ol.Feature} The sketch feature (or null if none).
+ * @private
+ */
+ol.interaction.Draw.prototype.abortDrawing_ = function() {
+  this.finishCoordinate_ = null;
+  var sketchFeature = this.sketchFeature_;
+  if (sketchFeature) {
+    this.sketchFeature_ = null;
+    this.sketchPoint_ = null;
+    this.sketchLine_ = null;
+    this.overlay_.getSource().clear(true);
+  }
+  return sketchFeature;
+};
+
+
+/**
+ * Extend an existing geometry by adding additional points. This only works
+ * on features with `LineString` geometries, where the interaction will
+ * extend lines by adding points to the end of the coordinates array.
+ * @param {!ol.Feature} feature Feature to be extended.
+ * @api
+ */
+ol.interaction.Draw.prototype.extend = function(feature) {
+  var geometry = feature.getGeometry();
+  goog.asserts.assert(this.mode_ == ol.interaction.DrawMode.LINE_STRING,
+      'interaction mode must be "line"');
+  goog.asserts.assert(geometry, 'feature must have a geometry');
+  goog.asserts.assert(geometry.getType() == ol.geom.GeometryType.LINE_STRING,
+      'feature geometry must be a line string');
+  var lineString = /** @type {ol.geom.LineString} */ (geometry);
+  this.sketchFeature_ = feature;
+  this.sketchCoords_ = lineString.getCoordinates();
+  var last = this.sketchCoords_[this.sketchCoords_.length - 1];
+  this.finishCoordinate_ = last.slice();
+  this.sketchCoords_.push(last.slice());
+  this.updateSketchFeatures_();
+  this.dispatchEvent(new ol.interaction.DrawEvent(
+      ol.interaction.DrawEventType.DRAWSTART, this.sketchFeature_));
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.interaction.Draw.prototype.shouldStopEvent = goog.functions.FALSE;
+
+
+/**
+ * Redraw the sketch features.
+ * @private
+ */
+ol.interaction.Draw.prototype.updateSketchFeatures_ = function() {
+  var sketchFeatures = [];
+  if (this.sketchFeature_) {
+    sketchFeatures.push(this.sketchFeature_);
+  }
+  if (this.sketchLine_) {
+    sketchFeatures.push(this.sketchLine_);
+  }
+  if (this.sketchPoint_) {
+    sketchFeatures.push(this.sketchPoint_);
+  }
+  var overlaySource = this.overlay_.getSource();
+  overlaySource.clear(true);
+  overlaySource.addFeatures(sketchFeatures);
+};
+
+
+/**
+ * @private
+ */
+ol.interaction.Draw.prototype.updateState_ = function() {
+  var map = this.getMap();
+  var active = this.getActive();
+  if (!map || !active) {
+    this.abortDrawing_();
+  }
+  this.overlay_.setMap(active ? map : null);
+};
+
+
+/**
+ * Create a `geometryFunction` for `mode: 'Circle'` that will create a regular
+ * polygon with a user specified number of sides and start angle instead of an
+ * `ol.geom.Circle` geometry.
+ * @param {number=} opt_sides Number of sides of the regular polygon. Default is
+ *     32.
+ * @param {number=} opt_angle Angle of the first point in radians. 0 means East.
+ *     Default is the angle defined by the heading from the center of the
+ *     regular polygon to the current pointer position.
+ * @return {ol.interaction.DrawGeometryFunctionType} Function that draws a
+ *     polygon.
+ * @api
+ */
+ol.interaction.Draw.createRegularPolygon = function(opt_sides, opt_angle) {
+  return (
+      /**
+       * @param {ol.Coordinate|Array.<ol.Coordinate>|Array.<Array.<ol.Coordinate>>} coordinates
+       * @param {ol.geom.SimpleGeometry=} opt_geometry
+       * @return {ol.geom.SimpleGeometry}
+       */
+      function(coordinates, opt_geometry) {
+        var center = coordinates[0];
+        var end = coordinates[1];
+        var radius = Math.sqrt(
+            ol.coordinate.squaredDistance(center, end));
+        var geometry = opt_geometry ? opt_geometry :
+            ol.geom.Polygon.fromCircle(new ol.geom.Circle(center), opt_sides);
+        goog.asserts.assertInstanceof(geometry, ol.geom.Polygon,
+            'geometry must be a polygon');
+        var angle = opt_angle ? opt_angle :
+            Math.atan((end[1] - center[1]) / (end[0] - center[0]));
+        ol.geom.Polygon.makeRegular(geometry, center, radius, angle);
+        return geometry;
+      }
+  );
+};
+
+
+/**
+ * Get the drawing mode.  The mode for mult-part geometries is the same as for
+ * their single-part cousins.
+ * @param {ol.geom.GeometryType} type Geometry type.
+ * @return {ol.interaction.DrawMode} Drawing mode.
+ * @private
+ */
+ol.interaction.Draw.getMode_ = function(type) {
+  var mode;
+  if (type === ol.geom.GeometryType.POINT ||
+      type === ol.geom.GeometryType.MULTI_POINT) {
+    mode = ol.interaction.DrawMode.POINT;
+  } else if (type === ol.geom.GeometryType.LINE_STRING ||
+      type === ol.geom.GeometryType.MULTI_LINE_STRING) {
+    mode = ol.interaction.DrawMode.LINE_STRING;
+  } else if (type === ol.geom.GeometryType.POLYGON ||
+      type === ol.geom.GeometryType.MULTI_POLYGON) {
+    mode = ol.interaction.DrawMode.POLYGON;
+  } else if (type === ol.geom.GeometryType.CIRCLE) {
+    mode = ol.interaction.DrawMode.CIRCLE;
+  }
+  goog.asserts.assert(mode !== undefined, 'mode should be defined');
+  return mode;
+};
+
+
+/**
+ * Function that takes coordinates and an optional existing geometry as
+ * arguments, and returns a geometry. The optional existing geometry is the
+ * geometry that is returned when the function is called without a second
+ * argument.
+ * @typedef {function(!(ol.Coordinate|Array.<ol.Coordinate>|
+ *     Array.<Array.<ol.Coordinate>>), ol.geom.SimpleGeometry=):
+ *     ol.geom.SimpleGeometry}
+ * @api
+ */
+ol.interaction.DrawGeometryFunctionType;
+
+
+/**
+ * Draw mode.  This collapses multi-part geometry types with their single-part
+ * cousins.
+ * @enum {string}
+ */
+ol.interaction.DrawMode = {
+  POINT: 'Point',
+  LINE_STRING: 'LineString',
+  POLYGON: 'Polygon',
+  CIRCLE: 'Circle'
+};
+
+goog.provide('ol.interaction.Modify');
+goog.provide('ol.interaction.ModifyEvent');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.Event');
+goog.require('goog.events.EventType');
+goog.require('goog.functions');
+goog.require('ol');
+goog.require('ol.Collection');
+goog.require('ol.CollectionEventType');
+goog.require('ol.Feature');
+goog.require('ol.MapBrowserEvent.EventType');
+goog.require('ol.MapBrowserPointerEvent');
+goog.require('ol.ViewHint');
+goog.require('ol.coordinate');
+goog.require('ol.events.condition');
+goog.require('ol.extent');
+goog.require('ol.geom.GeometryType');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.MultiLineString');
+goog.require('ol.geom.MultiPoint');
+goog.require('ol.geom.MultiPolygon');
+goog.require('ol.geom.Point');
+goog.require('ol.geom.Polygon');
+goog.require('ol.interaction.Pointer');
+goog.require('ol.layer.Vector');
+goog.require('ol.source.Vector');
+goog.require('ol.structs.RBush');
+
+
+/**
+ * @enum {string}
+ */
+ol.ModifyEventType = {
+  /**
+   * Triggered upon feature modification start
+   * @event ol.interaction.ModifyEvent#modifystart
+   * @api
+   */
+  MODIFYSTART: 'modifystart',
+  /**
+   * Triggered upon feature modification end
+   * @event ol.interaction.ModifyEvent#modifyend
+   * @api
+   */
+  MODIFYEND: 'modifyend'
+};
+
+
+
+/**
+ * @classdesc
+ * Events emitted by {@link ol.interaction.Modify} instances are instances of
+ * this type.
+ *
+ * @constructor
+ * @extends {goog.events.Event}
+ * @implements {oli.ModifyEvent}
+ * @param {ol.ModifyEventType} type Type.
+ * @param {ol.Collection.<ol.Feature>} features The features modified.
+ * @param {ol.MapBrowserPointerEvent} mapBrowserPointerEvent Associated
+ *     {@link ol.MapBrowserPointerEvent}.
+ */
+ol.interaction.ModifyEvent = function(type, features, mapBrowserPointerEvent) {
+
+  goog.base(this, type);
+
+  /**
+   * The features being modified.
+   * @type {ol.Collection.<ol.Feature>}
+   * @api
+   */
+  this.features = features;
+
+  /**
+   * Associated {@link ol.MapBrowserPointerEvent}.
+   * @type {ol.MapBrowserPointerEvent}
+   * @api
+   */
+  this.mapBrowserPointerEvent = mapBrowserPointerEvent;
+};
+goog.inherits(ol.interaction.ModifyEvent, goog.events.Event);
+
+
+/**
+ * @typedef {{depth: (Array.<number>|undefined),
+ *            feature: ol.Feature,
+ *            geometry: ol.geom.SimpleGeometry,
+ *            index: (number|undefined),
+ *            segment: Array.<ol.Extent>}}
+ */
+ol.interaction.SegmentDataType;
+
+
+
+/**
+ * @classdesc
+ * Interaction for modifying feature geometries.
+ *
+ * @constructor
+ * @extends {ol.interaction.Pointer}
+ * @param {olx.interaction.ModifyOptions} options Options.
+ * @fires ol.interaction.ModifyEvent
+ * @api
+ */
+ol.interaction.Modify = function(options) {
+
+  goog.base(this, {
+    handleDownEvent: ol.interaction.Modify.handleDownEvent_,
+    handleDragEvent: ol.interaction.Modify.handleDragEvent_,
+    handleEvent: ol.interaction.Modify.handleEvent,
+    handleUpEvent: ol.interaction.Modify.handleUpEvent_
+  });
+
+  /**
+   * @type {ol.events.ConditionType}
+   * @private
+   */
+  this.deleteCondition_ = options.deleteCondition ?
+      options.deleteCondition :
+      /** @type {ol.events.ConditionType} */ (goog.functions.and(
+          ol.events.condition.noModifierKeys,
+          ol.events.condition.singleClick));
+
+  /**
+   * Editing vertex.
+   * @type {ol.Feature}
+   * @private
+   */
+  this.vertexFeature_ = null;
+
+  /**
+   * Segments intersecting {@link this.vertexFeature_} by segment uid.
+   * @type {Object.<string, boolean>}
+   * @private
+   */
+  this.vertexSegments_ = null;
+
+  /**
+   * @type {ol.Pixel}
+   * @private
+   */
+  this.lastPixel_ = [0, 0];
+
+  /**
+   * Tracks if the next `singleclick` event should be ignored to prevent
+   * accidental deletion right after vertex creation.
+   * @type {boolean}
+   * @private
+   */
+  this.ignoreNextSingleClick_ = false;
+
+  /**
+   * @type {boolean}
+   * @private
+   */
+  this.modified_ = false;
+
+  /**
+   * Segment RTree for each layer
+   * @type {ol.structs.RBush.<ol.interaction.SegmentDataType>}
+   * @private
+   */
+  this.rBush_ = new ol.structs.RBush();
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.pixelTolerance_ = options.pixelTolerance !== undefined ?
+      options.pixelTolerance : 10;
+
+  /**
+   * @type {boolean}
+   * @private
+   */
+  this.snappedToVertex_ = false;
+
+  /**
+   * Indicate whether the interaction is currently changing a feature's
+   * coordinates.
+   * @type {boolean}
+   * @private
+   */
+  this.changingFeature_ = false;
+
+  /**
+   * @type {Array}
+   * @private
+   */
+  this.dragSegments_ = null;
+
+  /**
+   * Draw overlay where sketch features are drawn.
+   * @type {ol.layer.Vector}
+   * @private
+   */
+  this.overlay_ = new ol.layer.Vector({
+    source: new ol.source.Vector({
+      useSpatialIndex: false,
+      wrapX: !!options.wrapX
+    }),
+    style: options.style ? options.style :
+        ol.interaction.Modify.getDefaultStyleFunction(),
+    updateWhileAnimating: true,
+    updateWhileInteracting: true
+  });
+
+  /**
+  * @const
+  * @private
+  * @type {Object.<string, function(ol.Feature, ol.geom.Geometry)>}
+  */
+  this.SEGMENT_WRITERS_ = {
+    'Point': this.writePointGeometry_,
+    'LineString': this.writeLineStringGeometry_,
+    'LinearRing': this.writeLineStringGeometry_,
+    'Polygon': this.writePolygonGeometry_,
+    'MultiPoint': this.writeMultiPointGeometry_,
+    'MultiLineString': this.writeMultiLineStringGeometry_,
+    'MultiPolygon': this.writeMultiPolygonGeometry_,
+    'GeometryCollection': this.writeGeometryCollectionGeometry_
+  };
+
+  /**
+   * @type {ol.Collection.<ol.Feature>}
+   * @private
+   */
+  this.features_ = options.features;
+
+  this.features_.forEach(this.addFeature_, this);
+  goog.events.listen(this.features_, ol.CollectionEventType.ADD,
+      this.handleFeatureAdd_, false, this);
+  goog.events.listen(this.features_, ol.CollectionEventType.REMOVE,
+      this.handleFeatureRemove_, false, this);
+
+};
+goog.inherits(ol.interaction.Modify, ol.interaction.Pointer);
+
+
+/**
+ * @param {ol.Feature} feature Feature.
+ * @private
+ */
+ol.interaction.Modify.prototype.addFeature_ = function(feature) {
+  var geometry = feature.getGeometry();
+  if (geometry.getType() in this.SEGMENT_WRITERS_) {
+    this.SEGMENT_WRITERS_[geometry.getType()].call(this, feature, geometry);
+  }
+  var map = this.getMap();
+  if (map) {
+    this.handlePointerAtPixel_(this.lastPixel_, map);
+  }
+  goog.events.listen(feature, goog.events.EventType.CHANGE,
+      this.handleFeatureChange_, false, this);
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} evt Map browser event
+ * @private
+ */
+ol.interaction.Modify.prototype.willModifyFeatures_ = function(evt) {
+  if (!this.modified_) {
+    this.modified_ = true;
+    this.dispatchEvent(new ol.interaction.ModifyEvent(
+        ol.ModifyEventType.MODIFYSTART, this.features_, evt));
+  }
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature.
+ * @private
+ */
+ol.interaction.Modify.prototype.removeFeature_ = function(feature) {
+  this.removeFeatureSegmentData_(feature);
+  // Remove the vertex feature if the collection of canditate features
+  // is empty.
+  if (this.vertexFeature_ && this.features_.getLength() === 0) {
+    this.overlay_.getSource().removeFeature(this.vertexFeature_);
+    this.vertexFeature_ = null;
+  }
+  goog.events.unlisten(feature, goog.events.EventType.CHANGE,
+      this.handleFeatureChange_, false, this);
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature.
+ * @private
+ */
+ol.interaction.Modify.prototype.removeFeatureSegmentData_ = function(feature) {
+  var rBush = this.rBush_;
+  var /** @type {Array.<ol.interaction.SegmentDataType>} */ nodesToRemove = [];
+  rBush.forEach(
+      /**
+       * @param {ol.interaction.SegmentDataType} node RTree node.
+       */
+      function(node) {
+        if (feature === node.feature) {
+          nodesToRemove.push(node);
+        }
+      });
+  for (var i = nodesToRemove.length - 1; i >= 0; --i) {
+    rBush.remove(nodesToRemove[i]);
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.interaction.Modify.prototype.setMap = function(map) {
+  this.overlay_.setMap(map);
+  goog.base(this, 'setMap', map);
+};
+
+
+/**
+ * @param {ol.CollectionEvent} evt Event.
+ * @private
+ */
+ol.interaction.Modify.prototype.handleFeatureAdd_ = function(evt) {
+  var feature = evt.element;
+  goog.asserts.assertInstanceof(feature, ol.Feature,
+      'feature should be an ol.Feature');
+  this.addFeature_(feature);
+};
+
+
+/**
+ * @param {goog.events.Event} evt Event.
+ * @private
+ */
+ol.interaction.Modify.prototype.handleFeatureChange_ = function(evt) {
+  if (!this.changingFeature_) {
+    var feature = /** @type {ol.Feature} */ (evt.target);
+    this.removeFeature_(feature);
+    this.addFeature_(feature);
+  }
+};
+
+
+/**
+ * @param {ol.CollectionEvent} evt Event.
+ * @private
+ */
+ol.interaction.Modify.prototype.handleFeatureRemove_ = function(evt) {
+  var feature = /** @type {ol.Feature} */ (evt.element);
+  this.removeFeature_(feature);
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature
+ * @param {ol.geom.Point} geometry Geometry.
+ * @private
+ */
+ol.interaction.Modify.prototype.writePointGeometry_ =
+    function(feature, geometry) {
+  var coordinates = geometry.getCoordinates();
+  var segmentData = /** @type {ol.interaction.SegmentDataType} */ ({
+    feature: feature,
+    geometry: geometry,
+    segment: [coordinates, coordinates]
+  });
+  this.rBush_.insert(geometry.getExtent(), segmentData);
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature
+ * @param {ol.geom.MultiPoint} geometry Geometry.
+ * @private
+ */
+ol.interaction.Modify.prototype.writeMultiPointGeometry_ =
+    function(feature, geometry) {
+  var points = geometry.getCoordinates();
+  var coordinates, i, ii, segmentData;
+  for (i = 0, ii = points.length; i < ii; ++i) {
+    coordinates = points[i];
+    segmentData = /** @type {ol.interaction.SegmentDataType} */ ({
+      feature: feature,
+      geometry: geometry,
+      depth: [i],
+      index: i,
+      segment: [coordinates, coordinates]
+    });
+    this.rBush_.insert(geometry.getExtent(), segmentData);
+  }
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature
+ * @param {ol.geom.LineString} geometry Geometry.
+ * @private
+ */
+ol.interaction.Modify.prototype.writeLineStringGeometry_ =
+    function(feature, geometry) {
+  var coordinates = geometry.getCoordinates();
+  var i, ii, segment, segmentData;
+  for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
+    segment = coordinates.slice(i, i + 2);
+    segmentData = /** @type {ol.interaction.SegmentDataType} */ ({
+      feature: feature,
+      geometry: geometry,
+      index: i,
+      segment: segment
+    });
+    this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
+  }
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature
+ * @param {ol.geom.MultiLineString} geometry Geometry.
+ * @private
+ */
+ol.interaction.Modify.prototype.writeMultiLineStringGeometry_ =
+    function(feature, geometry) {
+  var lines = geometry.getCoordinates();
+  var coordinates, i, ii, j, jj, segment, segmentData;
+  for (j = 0, jj = lines.length; j < jj; ++j) {
+    coordinates = lines[j];
+    for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
+      segment = coordinates.slice(i, i + 2);
+      segmentData = /** @type {ol.interaction.SegmentDataType} */ ({
+        feature: feature,
+        geometry: geometry,
+        depth: [j],
+        index: i,
+        segment: segment
+      });
+      this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
+    }
+  }
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature
+ * @param {ol.geom.Polygon} geometry Geometry.
+ * @private
+ */
+ol.interaction.Modify.prototype.writePolygonGeometry_ =
+    function(feature, geometry) {
+  var rings = geometry.getCoordinates();
+  var coordinates, i, ii, j, jj, segment, segmentData;
+  for (j = 0, jj = rings.length; j < jj; ++j) {
+    coordinates = rings[j];
+    for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
+      segment = coordinates.slice(i, i + 2);
+      segmentData = /** @type {ol.interaction.SegmentDataType} */ ({
+        feature: feature,
+        geometry: geometry,
+        depth: [j],
+        index: i,
+        segment: segment
+      });
+      this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
+    }
+  }
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature
+ * @param {ol.geom.MultiPolygon} geometry Geometry.
+ * @private
+ */
+ol.interaction.Modify.prototype.writeMultiPolygonGeometry_ =
+    function(feature, geometry) {
+  var polygons = geometry.getCoordinates();
+  var coordinates, i, ii, j, jj, k, kk, rings, segment, segmentData;
+  for (k = 0, kk = polygons.length; k < kk; ++k) {
+    rings = polygons[k];
+    for (j = 0, jj = rings.length; j < jj; ++j) {
+      coordinates = rings[j];
+      for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
+        segment = coordinates.slice(i, i + 2);
+        segmentData = /** @type {ol.interaction.SegmentDataType} */ ({
+          feature: feature,
+          geometry: geometry,
+          depth: [j, k],
+          index: i,
+          segment: segment
+        });
+        this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
+      }
+    }
+  }
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature
+ * @param {ol.geom.GeometryCollection} geometry Geometry.
+ * @private
+ */
+ol.interaction.Modify.prototype.writeGeometryCollectionGeometry_ =
+    function(feature, geometry) {
+  var i, geometries = geometry.getGeometriesArray();
+  for (i = 0; i < geometries.length; ++i) {
+    this.SEGMENT_WRITERS_[geometries[i].getType()].call(
+        this, feature, geometries[i]);
+  }
+};
+
+
+/**
+ * @param {ol.Coordinate} coordinates Coordinates.
+ * @return {ol.Feature} Vertex feature.
+ * @private
+ */
+ol.interaction.Modify.prototype.createOrUpdateVertexFeature_ =
+    function(coordinates) {
+  var vertexFeature = this.vertexFeature_;
+  if (!vertexFeature) {
+    vertexFeature = new ol.Feature(new ol.geom.Point(coordinates));
+    this.vertexFeature_ = vertexFeature;
+    this.overlay_.getSource().addFeature(vertexFeature);
+  } else {
+    var geometry = /** @type {ol.geom.Point} */ (vertexFeature.getGeometry());
+    geometry.setCoordinates(coordinates);
+  }
+  return vertexFeature;
+};
+
+
+/**
+ * @param {ol.interaction.SegmentDataType} a
+ * @param {ol.interaction.SegmentDataType} b
+ * @return {number}
+ * @private
+ */
+ol.interaction.Modify.compareIndexes_ = function(a, b) {
+  return a.index - b.index;
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} evt Event.
+ * @return {boolean} Start drag sequence?
+ * @this {ol.interaction.Modify}
+ * @private
+ */
+ol.interaction.Modify.handleDownEvent_ = function(evt) {
+  this.handlePointerAtPixel_(evt.pixel, evt.map);
+  this.dragSegments_ = [];
+  this.modified_ = false;
+  var vertexFeature = this.vertexFeature_;
+  if (vertexFeature) {
+    var insertVertices = [];
+    var geometry = /** @type {ol.geom.Point} */ (vertexFeature.getGeometry());
+    var vertex = geometry.getCoordinates();
+    var vertexExtent = ol.extent.boundingExtent([vertex]);
+    var segmentDataMatches = this.rBush_.getInExtent(vertexExtent);
+    var componentSegments = {};
+    segmentDataMatches.sort(ol.interaction.Modify.compareIndexes_);
+    for (var i = 0, ii = segmentDataMatches.length; i < ii; ++i) {
+      var segmentDataMatch = segmentDataMatches[i];
+      var segment = segmentDataMatch.segment;
+      var uid = goog.getUid(segmentDataMatch.feature);
+      var depth = segmentDataMatch.depth;
+      if (depth) {
+        uid += '-' + depth.join('-'); // separate feature components
+      }
+      if (!componentSegments[uid]) {
+        componentSegments[uid] = new Array(2);
+      }
+      if (ol.coordinate.equals(segment[0], vertex) &&
+          !componentSegments[uid][0]) {
+        this.dragSegments_.push([segmentDataMatch, 0]);
+        componentSegments[uid][0] = segmentDataMatch;
+      } else if (ol.coordinate.equals(segment[1], vertex) &&
+          !componentSegments[uid][1]) {
+
+        // prevent dragging closed linestrings by the connecting node
+        if ((segmentDataMatch.geometry.getType() ===
+            ol.geom.GeometryType.LINE_STRING ||
+            segmentDataMatch.geometry.getType() ===
+            ol.geom.GeometryType.MULTI_LINE_STRING) &&
+            componentSegments[uid][0] &&
+            componentSegments[uid][0].index === 0) {
+          continue;
+        }
+
+        this.dragSegments_.push([segmentDataMatch, 1]);
+        componentSegments[uid][1] = segmentDataMatch;
+      } else if (goog.getUid(segment) in this.vertexSegments_ &&
+          (!componentSegments[uid][0] && !componentSegments[uid][1])) {
+        insertVertices.push([segmentDataMatch, vertex]);
+      }
+    }
+    if (insertVertices.length) {
+      this.willModifyFeatures_(evt);
+    }
+    for (i = insertVertices.length - 1; i >= 0; --i) {
+      this.insertVertex_.apply(this, insertVertices[i]);
+    }
+  }
+  return !!this.vertexFeature_;
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} evt Event.
+ * @this {ol.interaction.Modify}
+ * @private
+ */
+ol.interaction.Modify.handleDragEvent_ = function(evt) {
+  this.ignoreNextSingleClick_ = false;
+  this.willModifyFeatures_(evt);
+
+  var vertex = evt.coordinate;
+  for (var i = 0, ii = this.dragSegments_.length; i < ii; ++i) {
+    var dragSegment = this.dragSegments_[i];
+    var segmentData = dragSegment[0];
+    var depth = segmentData.depth;
+    var geometry = segmentData.geometry;
+    var coordinates = geometry.getCoordinates();
+    var segment = segmentData.segment;
+    var index = dragSegment[1];
+
+    while (vertex.length < geometry.getStride()) {
+      vertex.push(0);
+    }
+
+    switch (geometry.getType()) {
+      case ol.geom.GeometryType.POINT:
+        coordinates = vertex;
+        segment[0] = segment[1] = vertex;
+        break;
+      case ol.geom.GeometryType.MULTI_POINT:
+        coordinates[segmentData.index] = vertex;
+        segment[0] = segment[1] = vertex;
+        break;
+      case ol.geom.GeometryType.LINE_STRING:
+        coordinates[segmentData.index + index] = vertex;
+        segment[index] = vertex;
+        break;
+      case ol.geom.GeometryType.MULTI_LINE_STRING:
+        coordinates[depth[0]][segmentData.index + index] = vertex;
+        segment[index] = vertex;
+        break;
+      case ol.geom.GeometryType.POLYGON:
+        coordinates[depth[0]][segmentData.index + index] = vertex;
+        segment[index] = vertex;
+        break;
+      case ol.geom.GeometryType.MULTI_POLYGON:
+        coordinates[depth[1]][depth[0]][segmentData.index + index] = vertex;
+        segment[index] = vertex;
+        break;
+    }
+
+    this.setGeometryCoordinates_(geometry, coordinates);
+  }
+  this.createOrUpdateVertexFeature_(vertex);
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} evt Event.
+ * @return {boolean} Stop drag sequence?
+ * @this {ol.interaction.Modify}
+ * @private
+ */
+ol.interaction.Modify.handleUpEvent_ = function(evt) {
+  var segmentData;
+  for (var i = this.dragSegments_.length - 1; i >= 0; --i) {
+    segmentData = this.dragSegments_[i][0];
+    this.rBush_.update(ol.extent.boundingExtent(segmentData.segment),
+        segmentData);
+  }
+  if (this.modified_) {
+    this.dispatchEvent(new ol.interaction.ModifyEvent(
+        ol.ModifyEventType.MODIFYEND, this.features_, evt));
+    this.modified_ = false;
+  }
+  return false;
+};
+
+
+/**
+ * Handles the {@link ol.MapBrowserEvent map browser event} and may modify the
+ * geometry.
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} `false` to stop event propagation.
+ * @this {ol.interaction.Modify}
+ * @api
+ */
+ol.interaction.Modify.handleEvent = function(mapBrowserEvent) {
+  if (!(mapBrowserEvent instanceof ol.MapBrowserPointerEvent)) {
+    return true;
+  }
+
+  var handled;
+  if (!mapBrowserEvent.map.getView().getHints()[ol.ViewHint.INTERACTING] &&
+      mapBrowserEvent.type == ol.MapBrowserEvent.EventType.POINTERMOVE &&
+      !this.handlingDownUpSequence) {
+    this.handlePointerMove_(mapBrowserEvent);
+  }
+  if (this.vertexFeature_ && this.deleteCondition_(mapBrowserEvent)) {
+    if (mapBrowserEvent.type != ol.MapBrowserEvent.EventType.SINGLECLICK ||
+        !this.ignoreNextSingleClick_) {
+      var geometry = this.vertexFeature_.getGeometry();
+      goog.asserts.assertInstanceof(geometry, ol.geom.Point,
+          'geometry should be an ol.geom.Point');
+      this.willModifyFeatures_(mapBrowserEvent);
+      handled = this.removeVertex_();
+      this.dispatchEvent(new ol.interaction.ModifyEvent(
+          ol.ModifyEventType.MODIFYEND, this.features_, mapBrowserEvent));
+      this.modified_ = false;
+    } else {
+      handled = true;
+    }
+  }
+
+  if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.SINGLECLICK) {
+    this.ignoreNextSingleClick_ = false;
+  }
+
+  return ol.interaction.Pointer.handleEvent.call(this, mapBrowserEvent) &&
+      !handled;
+};
+
+
+/**
+ * @param {ol.MapBrowserEvent} evt Event.
+ * @private
+ */
+ol.interaction.Modify.prototype.handlePointerMove_ = function(evt) {
+  this.lastPixel_ = evt.pixel;
+  this.handlePointerAtPixel_(evt.pixel, evt.map);
+};
+
+
+/**
+ * @param {ol.Pixel} pixel Pixel
+ * @param {ol.Map} map Map.
+ * @private
+ */
+ol.interaction.Modify.prototype.handlePointerAtPixel_ = function(pixel, map) {
+  var pixelCoordinate = map.getCoordinateFromPixel(pixel);
+  var sortByDistance = function(a, b) {
+    return ol.coordinate.squaredDistanceToSegment(pixelCoordinate, a.segment) -
+        ol.coordinate.squaredDistanceToSegment(pixelCoordinate, b.segment);
+  };
+
+  var lowerLeft = map.getCoordinateFromPixel(
+      [pixel[0] - this.pixelTolerance_, pixel[1] + this.pixelTolerance_]);
+  var upperRight = map.getCoordinateFromPixel(
+      [pixel[0] + this.pixelTolerance_, pixel[1] - this.pixelTolerance_]);
+  var box = ol.extent.boundingExtent([lowerLeft, upperRight]);
+
+  var rBush = this.rBush_;
+  var nodes = rBush.getInExtent(box);
+  if (nodes.length > 0) {
+    nodes.sort(sortByDistance);
+    var node = nodes[0];
+    var closestSegment = node.segment;
+    var vertex = (ol.coordinate.closestOnSegment(pixelCoordinate,
+        closestSegment));
+    var vertexPixel = map.getPixelFromCoordinate(vertex);
+    if (Math.sqrt(ol.coordinate.squaredDistance(pixel, vertexPixel)) <=
+        this.pixelTolerance_) {
+      var pixel1 = map.getPixelFromCoordinate(closestSegment[0]);
+      var pixel2 = map.getPixelFromCoordinate(closestSegment[1]);
+      var squaredDist1 = ol.coordinate.squaredDistance(vertexPixel, pixel1);
+      var squaredDist2 = ol.coordinate.squaredDistance(vertexPixel, pixel2);
+      var dist = Math.sqrt(Math.min(squaredDist1, squaredDist2));
+      this.snappedToVertex_ = dist <= this.pixelTolerance_;
+      if (this.snappedToVertex_) {
+        vertex = squaredDist1 > squaredDist2 ?
+            closestSegment[1] : closestSegment[0];
+      }
+      this.createOrUpdateVertexFeature_(vertex);
+      var vertexSegments = {};
+      vertexSegments[goog.getUid(closestSegment)] = true;
+      var segment;
+      for (var i = 1, ii = nodes.length; i < ii; ++i) {
+        segment = nodes[i].segment;
+        if ((ol.coordinate.equals(closestSegment[0], segment[0]) &&
+            ol.coordinate.equals(closestSegment[1], segment[1]) ||
+            (ol.coordinate.equals(closestSegment[0], segment[1]) &&
+            ol.coordinate.equals(closestSegment[1], segment[0])))) {
+          vertexSegments[goog.getUid(segment)] = true;
+        } else {
+          break;
+        }
+      }
+      this.vertexSegments_ = vertexSegments;
+      return;
+    }
+  }
+  if (this.vertexFeature_) {
+    this.overlay_.getSource().removeFeature(this.vertexFeature_);
+    this.vertexFeature_ = null;
+  }
+};
+
+
+/**
+ * @param {ol.interaction.SegmentDataType} segmentData Segment data.
+ * @param {ol.Coordinate} vertex Vertex.
+ * @private
+ */
+ol.interaction.Modify.prototype.insertVertex_ = function(segmentData, vertex) {
+  var segment = segmentData.segment;
+  var feature = segmentData.feature;
+  var geometry = segmentData.geometry;
+  var depth = segmentData.depth;
+  var index = segmentData.index;
+  var coordinates;
+
+  while (vertex.length < geometry.getStride()) {
+    vertex.push(0);
+  }
+
+  switch (geometry.getType()) {
+    case ol.geom.GeometryType.MULTI_LINE_STRING:
+      goog.asserts.assertInstanceof(geometry, ol.geom.MultiLineString,
+          'geometry should be an ol.geom.MultiLineString');
+      coordinates = geometry.getCoordinates();
+      coordinates[depth[0]].splice(index + 1, 0, vertex);
+      break;
+    case ol.geom.GeometryType.POLYGON:
+      goog.asserts.assertInstanceof(geometry, ol.geom.Polygon,
+          'geometry should be an ol.geom.Polygon');
+      coordinates = geometry.getCoordinates();
+      coordinates[depth[0]].splice(index + 1, 0, vertex);
+      break;
+    case ol.geom.GeometryType.MULTI_POLYGON:
+      goog.asserts.assertInstanceof(geometry, ol.geom.MultiPolygon,
+          'geometry should be an ol.geom.MultiPolygon');
+      coordinates = geometry.getCoordinates();
+      coordinates[depth[1]][depth[0]].splice(index + 1, 0, vertex);
+      break;
+    case ol.geom.GeometryType.LINE_STRING:
+      goog.asserts.assertInstanceof(geometry, ol.geom.LineString,
+          'geometry should be an ol.geom.LineString');
+      coordinates = geometry.getCoordinates();
+      coordinates.splice(index + 1, 0, vertex);
+      break;
+    default:
+      return;
+  }
+
+  this.setGeometryCoordinates_(geometry, coordinates);
+  var rTree = this.rBush_;
+  goog.asserts.assert(segment !== undefined, 'segment should be defined');
+  rTree.remove(segmentData);
+  goog.asserts.assert(index !== undefined, 'index should be defined');
+  this.updateSegmentIndices_(geometry, index, depth, 1);
+  var newSegmentData = /** @type {ol.interaction.SegmentDataType} */ ({
+    segment: [segment[0], vertex],
+    feature: feature,
+    geometry: geometry,
+    depth: depth,
+    index: index
+  });
+  rTree.insert(ol.extent.boundingExtent(newSegmentData.segment),
+      newSegmentData);
+  this.dragSegments_.push([newSegmentData, 1]);
+
+  var newSegmentData2 = /** @type {ol.interaction.SegmentDataType} */ ({
+    segment: [vertex, segment[1]],
+    feature: feature,
+    geometry: geometry,
+    depth: depth,
+    index: index + 1
+  });
+  rTree.insert(ol.extent.boundingExtent(newSegmentData2.segment),
+      newSegmentData2);
+  this.dragSegments_.push([newSegmentData2, 0]);
+  this.ignoreNextSingleClick_ = true;
+};
+
+
+/**
+ * Removes a vertex from all matching features.
+ * @return {boolean} True when a vertex was removed.
+ * @private
+ */
+ol.interaction.Modify.prototype.removeVertex_ = function() {
+  var dragSegments = this.dragSegments_;
+  var segmentsByFeature = {};
+  var component, coordinates, dragSegment, geometry, i, index, left;
+  var newIndex, newSegment, right, segmentData, uid, deleted;
+  for (i = dragSegments.length - 1; i >= 0; --i) {
+    dragSegment = dragSegments[i];
+    segmentData = dragSegment[0];
+    geometry = segmentData.geometry;
+    coordinates = geometry.getCoordinates();
+    uid = goog.getUid(segmentData.feature);
+    if (segmentData.depth) {
+      // separate feature components
+      uid += '-' + segmentData.depth.join('-');
+    }
+    left = right = index = undefined;
+    if (dragSegment[1] === 0) {
+      right = segmentData;
+      index = segmentData.index;
+    } else if (dragSegment[1] == 1) {
+      left = segmentData;
+      index = segmentData.index + 1;
+    }
+    if (!(uid in segmentsByFeature)) {
+      segmentsByFeature[uid] = [left, right, index];
+    }
+    newSegment = segmentsByFeature[uid];
+    if (left !== undefined) {
+      newSegment[0] = left;
+    }
+    if (right !== undefined) {
+      newSegment[1] = right;
+    }
+    if (newSegment[0] !== undefined && newSegment[1] !== undefined) {
+      component = coordinates;
+      deleted = false;
+      newIndex = index - 1;
+      switch (geometry.getType()) {
+        case ol.geom.GeometryType.MULTI_LINE_STRING:
+          coordinates[segmentData.depth[0]].splice(index, 1);
+          deleted = true;
+          break;
+        case ol.geom.GeometryType.LINE_STRING:
+          coordinates.splice(index, 1);
+          deleted = true;
+          break;
+        case ol.geom.GeometryType.MULTI_POLYGON:
+          component = component[segmentData.depth[1]];
+          /* falls through */
+        case ol.geom.GeometryType.POLYGON:
+          component = component[segmentData.depth[0]];
+          if (component.length > 4) {
+            if (index == component.length - 1) {
+              index = 0;
+            }
+            component.splice(index, 1);
+            deleted = true;
+            if (index === 0) {
+              // close the ring again
+              component.pop();
+              component.push(component[0]);
+              newIndex = component.length - 1;
+            }
+          }
+          break;
+      }
+
+      if (deleted) {
+        this.rBush_.remove(newSegment[0]);
+        this.rBush_.remove(newSegment[1]);
+        this.setGeometryCoordinates_(geometry, coordinates);
+        goog.asserts.assert(newIndex >= 0, 'newIndex should be larger than 0');
+        var newSegmentData = /** @type {ol.interaction.SegmentDataType} */ ({
+          depth: segmentData.depth,
+          feature: segmentData.feature,
+          geometry: segmentData.geometry,
+          index: newIndex,
+          segment: [newSegment[0].segment[0], newSegment[1].segment[1]]
+        });
+        this.rBush_.insert(ol.extent.boundingExtent(newSegmentData.segment),
+            newSegmentData);
+        this.updateSegmentIndices_(geometry, index, segmentData.depth, -1);
+
+        if (this.vertexFeature_) {
+          this.overlay_.getSource().removeFeature(this.vertexFeature_);
+          this.vertexFeature_ = null;
+        }
+      }
+    }
+  }
+  return true;
+};
+
+
+/**
+ * @param {ol.geom.SimpleGeometry} geometry Geometry.
+ * @param {Array} coordinates Coordinates.
+ * @private
+ */
+ol.interaction.Modify.prototype.setGeometryCoordinates_ =
+    function(geometry, coordinates) {
+  this.changingFeature_ = true;
+  geometry.setCoordinates(coordinates);
+  this.changingFeature_ = false;
+};
+
+
+/**
+ * @param {ol.geom.SimpleGeometry} geometry Geometry.
+ * @param {number} index Index.
+ * @param {Array.<number>|undefined} depth Depth.
+ * @param {number} delta Delta (1 or -1).
+ * @private
+ */
+ol.interaction.Modify.prototype.updateSegmentIndices_ = function(
+    geometry, index, depth, delta) {
+  this.rBush_.forEachInExtent(geometry.getExtent(), function(segmentDataMatch) {
+    if (segmentDataMatch.geometry === geometry &&
+        (depth === undefined || segmentDataMatch.depth === undefined ||
+        goog.array.equals(
+            /** @type {null|{length: number}} */ (segmentDataMatch.depth),
+            depth)) &&
+        segmentDataMatch.index > index) {
+      segmentDataMatch.index += delta;
+    }
+  });
+};
+
+
+/**
+ * @return {ol.style.StyleFunction} Styles.
+ */
+ol.interaction.Modify.getDefaultStyleFunction = function() {
+  var style = ol.style.createDefaultEditingStyles();
+  return function(feature, resolution) {
+    return style[ol.geom.GeometryType.POINT];
+  };
+};
+
+goog.provide('ol.interaction.Select');
+goog.provide('ol.interaction.SelectEvent');
+goog.provide('ol.interaction.SelectEventType');
+goog.provide('ol.interaction.SelectFilterFunction');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.Event');
+goog.require('goog.functions');
+goog.require('goog.object');
+goog.require('ol.CollectionEventType');
+goog.require('ol.Feature');
+goog.require('ol.array');
+goog.require('ol.events.condition');
+goog.require('ol.geom.GeometryType');
+goog.require('ol.interaction.Interaction');
+goog.require('ol.layer.Vector');
+goog.require('ol.source.Vector');
+
+
+/**
+ * @enum {string}
+ */
+ol.interaction.SelectEventType = {
+  /**
+   * Triggered when feature(s) has been (de)selected.
+   * @event ol.interaction.SelectEvent#select
+   * @api
+   */
+  SELECT: 'select'
+};
+
+
+/**
+ * A function that takes an {@link ol.Feature} or {@link ol.render.Feature} and
+ * an {@link ol.layer.Layer} and returns `true` if the feature may be selected
+ * or `false` otherwise.
+ * @typedef {function((ol.Feature|ol.render.Feature), ol.layer.Layer):
+ *     boolean}
+ * @api
+ */
+ol.interaction.SelectFilterFunction;
+
+
+
+/**
+ * @classdesc
+ * Events emitted by {@link ol.interaction.Select} instances are instances of
+ * this type.
+ *
+ * @param {string} type The event type.
+ * @param {Array.<ol.Feature>} selected Selected features.
+ * @param {Array.<ol.Feature>} deselected Deselected features.
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Associated
+ *     {@link ol.MapBrowserEvent}.
+ * @implements {oli.SelectEvent}
+ * @extends {goog.events.Event}
+ * @constructor
+ */
+ol.interaction.SelectEvent =
+    function(type, selected, deselected, mapBrowserEvent) {
+  goog.base(this, type);
+
+  /**
+   * Selected features array.
+   * @type {Array.<ol.Feature>}
+   * @api
+   */
+  this.selected = selected;
+
+  /**
+   * Deselected features array.
+   * @type {Array.<ol.Feature>}
+   * @api
+   */
+  this.deselected = deselected;
+
+  /**
+   * Associated {@link ol.MapBrowserEvent}.
+   * @type {ol.MapBrowserEvent}
+   * @api
+   */
+  this.mapBrowserEvent = mapBrowserEvent;
+};
+goog.inherits(ol.interaction.SelectEvent, goog.events.Event);
+
+
+
+/**
+ * @classdesc
+ * Interaction for selecting vector features. By default, selected features are
+ * styled differently, so this interaction can be used for visual highlighting,
+ * as well as selecting features for other actions, such as modification or
+ * output. There are three ways of controlling which features are selected:
+ * using the browser event as defined by the `condition` and optionally the
+ * `toggle`, `add`/`remove`, and `multi` options; a `layers` filter; and a
+ * further feature filter using the `filter` option.
+ *
+ * Selected features are added to an internal unmanaged layer.
+ *
+ * @constructor
+ * @extends {ol.interaction.Interaction}
+ * @param {olx.interaction.SelectOptions=} opt_options Options.
+ * @fires ol.interaction.SelectEvent
+ * @api stable
+ */
+ol.interaction.Select = function(opt_options) {
+
+  goog.base(this, {
+    handleEvent: ol.interaction.Select.handleEvent
+  });
+
+  var options = opt_options ? opt_options : {};
+
+  /**
+   * @private
+   * @type {ol.events.ConditionType}
+   */
+  this.condition_ = options.condition ?
+      options.condition : ol.events.condition.singleClick;
+
+  /**
+   * @private
+   * @type {ol.events.ConditionType}
+   */
+  this.addCondition_ = options.addCondition ?
+      options.addCondition : ol.events.condition.never;
+
+  /**
+   * @private
+   * @type {ol.events.ConditionType}
+   */
+  this.removeCondition_ = options.removeCondition ?
+      options.removeCondition : ol.events.condition.never;
+
+  /**
+   * @private
+   * @type {ol.events.ConditionType}
+   */
+  this.toggleCondition_ = options.toggleCondition ?
+      options.toggleCondition : ol.events.condition.shiftKeyOnly;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.multi_ = options.multi ? options.multi : false;
+
+  /**
+   * @private
+   * @type {ol.interaction.SelectFilterFunction}
+   */
+  this.filter_ = options.filter ? options.filter :
+      goog.functions.TRUE;
+
+  var layerFilter;
+  if (options.layers) {
+    if (goog.isFunction(options.layers)) {
+      layerFilter = options.layers;
+    } else {
+      var layers = options.layers;
+      layerFilter =
+          /**
+           * @param {ol.layer.Layer} layer Layer.
+           * @return {boolean} Include.
+           */
+          function(layer) {
+        return ol.array.includes(layers, layer);
+      };
+    }
+  } else {
+    layerFilter = goog.functions.TRUE;
+  }
+
+  /**
+   * @private
+   * @type {function(ol.layer.Layer): boolean}
+   */
+  this.layerFilter_ = layerFilter;
+
+  /**
+   * An association between selected feature (key)
+   * and layer (value)
+   * @private
+   * @type {Object.<number, ol.layer.Layer>}
+   */
+  this.featureLayerAssociation_ = {};
+
+  /**
+   * @private
+   * @type {ol.layer.Vector}
+   */
+  this.featureOverlay_ = new ol.layer.Vector({
+    source: new ol.source.Vector({
+      useSpatialIndex: false,
+      features: options.features,
+      wrapX: options.wrapX
+    }),
+    style: options.style ? options.style :
+        ol.interaction.Select.getDefaultStyleFunction(),
+    updateWhileAnimating: true,
+    updateWhileInteracting: true
+  });
+
+  var features = this.featureOverlay_.getSource().getFeaturesCollection();
+  goog.events.listen(features, ol.CollectionEventType.ADD,
+      this.addFeature_, false, this);
+  goog.events.listen(features, ol.CollectionEventType.REMOVE,
+      this.removeFeature_, false, this);
+
+};
+goog.inherits(ol.interaction.Select, ol.interaction.Interaction);
+
+
+/**
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ * @param {ol.layer.Layer} layer Layer.
+ * @private
+ */
+ol.interaction.Select.prototype.addFeatureLayerAssociation_ =
+    function(feature, layer) {
+  var key = goog.getUid(feature);
+  this.featureLayerAssociation_[key] = layer;
+};
+
+
+/**
+ * Get the selected features.
+ * @return {ol.Collection.<ol.Feature>} Features collection.
+ * @api stable
+ */
+ol.interaction.Select.prototype.getFeatures = function() {
+  return this.featureOverlay_.getSource().getFeaturesCollection();
+};
+
+
+/**
+ * Returns the associated {@link ol.layer.Vector vectorlayer} of
+ * the (last) selected feature. Note that this will not work with any
+ * programmatic method like pushing features to
+ * {@link ol.interaction.Select#getFeatures collection}.
+ * @param {ol.Feature|ol.render.Feature} feature Feature
+ * @return {ol.layer.Vector} Layer.
+ * @api
+ */
+ol.interaction.Select.prototype.getLayer = function(feature) {
+  goog.asserts.assertInstanceof(feature, ol.Feature,
+      'feature should be an ol.Feature');
+  var key = goog.getUid(feature);
+  return /** @type {ol.layer.Vector} */ (this.featureLayerAssociation_[key]);
+};
+
+
+/**
+ * Handles the {@link ol.MapBrowserEvent map browser event} and may change the
+ * selected state of features.
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
+ * @return {boolean} `false` to stop event propagation.
+ * @this {ol.interaction.Select}
+ * @api
+ */
+ol.interaction.Select.handleEvent = function(mapBrowserEvent) {
+  if (!this.condition_(mapBrowserEvent)) {
+    return true;
+  }
+  var add = this.addCondition_(mapBrowserEvent);
+  var remove = this.removeCondition_(mapBrowserEvent);
+  var toggle = this.toggleCondition_(mapBrowserEvent);
+  var set = !add && !remove && !toggle;
+  var map = mapBrowserEvent.map;
+  var features = this.featureOverlay_.getSource().getFeaturesCollection();
+  var /** @type {!Array.<ol.Feature>} */ deselected = [];
+  var /** @type {!Array.<ol.Feature>} */ selected = [];
+  var change = false;
+  if (set) {
+    // Replace the currently selected feature(s) with the feature(s) at the
+    // pixel, or clear the selected feature(s) if there is no feature at
+    // the pixel.
+    map.forEachFeatureAtPixel(mapBrowserEvent.pixel,
+        /**
+         * @param {ol.Feature|ol.render.Feature} feature Feature.
+         * @param {ol.layer.Layer} layer Layer.
+         */
+        function(feature, layer) {
+          if (this.filter_(feature, layer)) {
+            selected.push(feature);
+            this.addFeatureLayerAssociation_(feature, layer);
+            return !this.multi_;
+          }
+        }, this, this.layerFilter_);
+    if (selected.length > 0 && features.getLength() == 1 &&
+        features.item(0) == selected[0]) {
+      // No change
+    } else {
+      change = true;
+      if (features.getLength() !== 0) {
+        deselected = Array.prototype.concat(features.getArray());
+        features.clear();
+      }
+      features.extend(selected);
+      // Modify object this.featureLayerAssociation_
+      if (selected.length === 0) {
+        goog.object.clear(this.featureLayerAssociation_);
+      } else {
+        if (deselected.length > 0) {
+          deselected.forEach(function(feature) {
+            this.removeFeatureLayerAssociation_(feature);
+          }, this);
+        }
+      }
+    }
+  } else {
+    // Modify the currently selected feature(s).
+    map.forEachFeatureAtPixel(mapBrowserEvent.pixel,
+        /**
+         * @param {ol.Feature|ol.render.Feature} feature Feature.
+         * @param {ol.layer.Layer} layer Layer.
+         */
+        function(feature, layer) {
+          if (!ol.array.includes(features.getArray(), feature)) {
+            if (add || toggle) {
+              if (this.filter_(feature, layer)) {
+                selected.push(feature);
+                this.addFeatureLayerAssociation_(feature, layer);
+              }
+            }
+          } else {
+            if (remove || toggle) {
+              deselected.push(feature);
+              this.removeFeatureLayerAssociation_(feature);
+            }
+          }
+        }, this, this.layerFilter_);
+    var i;
+    for (i = deselected.length - 1; i >= 0; --i) {
+      features.remove(deselected[i]);
+    }
+    features.extend(selected);
+    if (selected.length > 0 || deselected.length > 0) {
+      change = true;
+    }
+  }
+  if (change) {
+    this.dispatchEvent(
+        new ol.interaction.SelectEvent(ol.interaction.SelectEventType.SELECT,
+            selected, deselected, mapBrowserEvent));
+  }
+  return ol.events.condition.pointerMove(mapBrowserEvent);
+};
+
+
+/**
+ * Remove the interaction from its current map, if any,  and attach it to a new
+ * map, if any. Pass `null` to just remove the interaction from the current map.
+ * @param {ol.Map} map Map.
+ * @api stable
+ */
+ol.interaction.Select.prototype.setMap = function(map) {
+  var currentMap = this.getMap();
+  var selectedFeatures =
+      this.featureOverlay_.getSource().getFeaturesCollection();
+  if (currentMap) {
+    selectedFeatures.forEach(currentMap.unskipFeature, currentMap);
+  }
+  goog.base(this, 'setMap', map);
+  this.featureOverlay_.setMap(map);
+  if (map) {
+    selectedFeatures.forEach(map.skipFeature, map);
+  }
+};
+
+
+/**
+ * @return {ol.style.StyleFunction} Styles.
+ */
+ol.interaction.Select.getDefaultStyleFunction = function() {
+  var styles = ol.style.createDefaultEditingStyles();
+  goog.array.extend(styles[ol.geom.GeometryType.POLYGON],
+      styles[ol.geom.GeometryType.LINE_STRING]);
+  goog.array.extend(styles[ol.geom.GeometryType.GEOMETRY_COLLECTION],
+      styles[ol.geom.GeometryType.LINE_STRING]);
+
+  return function(feature, resolution) {
+    return styles[feature.getGeometry().getType()];
+  };
+};
+
+
+/**
+ * @param {ol.CollectionEvent} evt Event.
+ * @private
+ */
+ol.interaction.Select.prototype.addFeature_ = function(evt) {
+  var feature = evt.element;
+  var map = this.getMap();
+  goog.asserts.assertInstanceof(feature, ol.Feature,
+      'feature should be an ol.Feature');
+  if (map) {
+    map.skipFeature(feature);
+  }
+};
+
+
+/**
+ * @param {ol.CollectionEvent} evt Event.
+ * @private
+ */
+ol.interaction.Select.prototype.removeFeature_ = function(evt) {
+  var feature = evt.element;
+  var map = this.getMap();
+  goog.asserts.assertInstanceof(feature, ol.Feature,
+      'feature should be an ol.Feature');
+  if (map) {
+    map.unskipFeature(feature);
+  }
+};
+
+
+/**
+ * @param {ol.Feature|ol.render.Feature} feature Feature.
+ * @private
+ */
+ol.interaction.Select.prototype.removeFeatureLayerAssociation_ =
+    function(feature) {
+  var key = goog.getUid(feature);
+  delete this.featureLayerAssociation_[key];
+};
+
+goog.provide('ol.interaction.Snap');
+goog.provide('ol.interaction.SnapProperty');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.Collection');
+goog.require('ol.CollectionEvent');
+goog.require('ol.CollectionEventType');
+goog.require('ol.Extent');
+goog.require('ol.Feature');
+goog.require('ol.Object');
+goog.require('ol.Observable');
+goog.require('ol.coordinate');
+goog.require('ol.extent');
+goog.require('ol.geom.Geometry');
+goog.require('ol.interaction.Pointer');
+goog.require('ol.source.Vector');
+goog.require('ol.source.VectorEvent');
+goog.require('ol.source.VectorEventType');
+goog.require('ol.structs.RBush');
+
+
+
+/**
+ * @classdesc
+ * Handles snapping of vector features while modifying or drawing them.  The
+ * features can come from a {@link ol.source.Vector} or {@link ol.Collection}
+ * Any interaction object that allows the user to interact
+ * with the features using the mouse can benefit from the snapping, as long
+ * as it is added before.
+ *
+ * The snap interaction modifies map browser event `coordinate` and `pixel`
+ * properties to force the snap to occur to any interaction that them.
+ *
+ * Example:
+ *
+ *     var snap = new ol.interaction.Snap({
+ *       source: source
+ *     });
+ *
+ * @constructor
+ * @extends {ol.interaction.Pointer}
+ * @param {olx.interaction.SnapOptions=} opt_options Options.
+ * @api
+ */
+ol.interaction.Snap = function(opt_options) {
+
+  goog.base(this, {
+    handleEvent: ol.interaction.Snap.handleEvent_,
+    handleDownEvent: goog.functions.TRUE,
+    handleUpEvent: ol.interaction.Snap.handleUpEvent_
+  });
+
+  var options = opt_options ? opt_options : {};
+
+  /**
+   * @type {ol.source.Vector}
+   * @private
+   */
+  this.source_ = options.source ? options.source : null;
+
+  /**
+   * @type {ol.Collection.<ol.Feature>}
+   * @private
+   */
+  this.features_ = options.features ? options.features : null;
+
+  /**
+   * @type {Array.<goog.events.Key>}
+   * @private
+   */
+  this.featuresListenerKeys_ = [];
+
+  /**
+   * @type {Object.<number, goog.events.Key>}
+   * @private
+   */
+  this.geometryChangeListenerKeys_ = {};
+
+  /**
+   * @type {Object.<number, goog.events.Key>}
+   * @private
+   */
+  this.geometryModifyListenerKeys_ = {};
+
+  /**
+   * Extents are preserved so indexed segment can be quickly removed
+   * when its feature geometry changes
+   * @type {Object.<number, ol.Extent>}
+   * @private
+   */
+  this.indexedFeaturesExtents_ = {};
+
+  /**
+   * If a feature geometry changes while a pointer drag|move event occurs, the
+   * feature doesn't get updated right away.  It will be at the next 'pointerup'
+   * event fired.
+   * @type {Object.<number, ol.Feature>}
+   * @private
+   */
+  this.pendingFeatures_ = {};
+
+  /**
+   * Used for distance sorting in sortByDistance_
+   * @type {ol.Coordinate}
+   * @private
+   */
+  this.pixelCoordinate_ = null;
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.pixelTolerance_ = options.pixelTolerance !== undefined ?
+      options.pixelTolerance : 10;
+
+  /**
+   * @type {function(ol.interaction.Snap.SegmentDataType, ol.interaction.Snap.SegmentDataType): number}
+   * @private
+   */
+  this.sortByDistance_ = goog.bind(ol.interaction.Snap.sortByDistance, this);
+
+
+  /**
+  * Segment RTree for each layer
+  * @type {ol.structs.RBush.<ol.interaction.Snap.SegmentDataType>}
+  * @private
+  */
+  this.rBush_ = new ol.structs.RBush();
+
+
+  /**
+  * @const
+  * @private
+  * @type {Object.<string, function(ol.Feature, ol.geom.Geometry)>}
+  */
+  this.SEGMENT_WRITERS_ = {
+    'Point': this.writePointGeometry_,
+    'LineString': this.writeLineStringGeometry_,
+    'LinearRing': this.writeLineStringGeometry_,
+    'Polygon': this.writePolygonGeometry_,
+    'MultiPoint': this.writeMultiPointGeometry_,
+    'MultiLineString': this.writeMultiLineStringGeometry_,
+    'MultiPolygon': this.writeMultiPolygonGeometry_,
+    'GeometryCollection': this.writeGeometryCollectionGeometry_
+  };
+};
+goog.inherits(ol.interaction.Snap, ol.interaction.Pointer);
+
+
+/**
+ * Add a feature to the collection of features that we may snap to.
+ * @param {ol.Feature} feature Feature.
+ * @param {boolean=} opt_listen Whether to listen to the geometry change or not
+ *     Defaults to `true`.
+ * @api
+ */
+ol.interaction.Snap.prototype.addFeature = function(feature, opt_listen) {
+  var listen = opt_listen !== undefined ? opt_listen : true;
+  var geometry = feature.getGeometry();
+  var segmentWriter = this.SEGMENT_WRITERS_[geometry.getType()];
+  if (segmentWriter) {
+    var feature_uid = goog.getUid(feature);
+    this.indexedFeaturesExtents_[feature_uid] = geometry.getExtent(
+        ol.extent.createEmpty());
+    segmentWriter.call(this, feature, geometry);
+
+    if (listen) {
+      this.geometryModifyListenerKeys_[feature_uid] = geometry.on(
+          goog.events.EventType.CHANGE,
+          goog.bind(this.handleGeometryModify_, this, feature),
+          this);
+      this.geometryChangeListenerKeys_[feature_uid] = feature.on(
+          ol.Object.getChangeEventType(feature.getGeometryName()),
+          this.handleGeometryChange_, this);
+    }
+  }
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature.
+ * @private
+ */
+ol.interaction.Snap.prototype.forEachFeatureAdd_ = function(feature) {
+  this.addFeature(feature);
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature.
+ * @private
+ */
+ol.interaction.Snap.prototype.forEachFeatureRemove_ = function(feature) {
+  this.removeFeature(feature);
+};
+
+
+/**
+ * @return {ol.Collection.<ol.Feature>|Array.<ol.Feature>}
+ * @private
+ */
+ol.interaction.Snap.prototype.getFeatures_ = function() {
+  var features;
+  if (this.features_) {
+    features = this.features_;
+  } else if (this.source_) {
+    features = this.source_.getFeatures();
+  }
+  goog.asserts.assert(features !== undefined, 'features should be defined');
+  return features;
+};
+
+
+/**
+ * @param {ol.source.VectorEvent|ol.CollectionEvent} evt Event.
+ * @private
+ */
+ol.interaction.Snap.prototype.handleFeatureAdd_ = function(evt) {
+  var feature;
+  if (evt instanceof ol.source.VectorEvent) {
+    feature = evt.feature;
+  } else if (evt instanceof ol.CollectionEvent) {
+    feature = evt.element;
+  }
+  goog.asserts.assertInstanceof(feature, ol.Feature,
+      'feature should be an ol.Feature');
+  this.addFeature(feature);
+};
+
+
+/**
+ * @param {ol.source.VectorEvent|ol.CollectionEvent} evt Event.
+ * @private
+ */
+ol.interaction.Snap.prototype.handleFeatureRemove_ = function(evt) {
+  var feature;
+  if (evt instanceof ol.source.VectorEvent) {
+    feature = evt.feature;
+  } else if (evt instanceof ol.CollectionEvent) {
+    feature = evt.element;
+  }
+  goog.asserts.assertInstanceof(feature, ol.Feature,
+      'feature should be an ol.Feature');
+  this.removeFeature(feature);
+};
+
+
+/**
+ * @param {goog.events.Event} evt Event.
+ * @private
+ */
+ol.interaction.Snap.prototype.handleGeometryChange_ = function(evt) {
+  var feature = evt.currentTarget;
+  goog.asserts.assertInstanceof(feature, ol.Feature);
+  this.removeFeature(feature, true);
+  this.addFeature(feature, true);
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature which geometry was modified.
+ * @param {goog.events.Event} evt Event.
+ * @private
+ */
+ol.interaction.Snap.prototype.handleGeometryModify_ = function(feature, evt) {
+  if (this.handlingDownUpSequence) {
+    var uid = goog.getUid(feature);
+    if (!(uid in this.pendingFeatures_)) {
+      this.pendingFeatures_[uid] = feature;
+    }
+  } else {
+    this.updateFeature_(feature);
+  }
+};
+
+
+/**
+ * Remove a feature from the collection of features that we may snap to.
+ * @param {ol.Feature} feature Feature
+ * @param {boolean=} opt_unlisten Whether to unlisten to the geometry change
+ *     or not. Defaults to `true`.
+ * @api
+ */
+ol.interaction.Snap.prototype.removeFeature = function(feature, opt_unlisten) {
+  var unlisten = opt_unlisten !== undefined ? opt_unlisten : true;
+  var feature_uid = goog.getUid(feature);
+  var extent = this.indexedFeaturesExtents_[feature_uid];
+  if (extent) {
+    var rBush = this.rBush_;
+    var i, nodesToRemove = [];
+    rBush.forEachInExtent(extent, function(node) {
+      if (feature === node.feature) {
+        nodesToRemove.push(node);
+      }
+    });
+    for (i = nodesToRemove.length - 1; i >= 0; --i) {
+      rBush.remove(nodesToRemove[i]);
+    }
+    if (unlisten) {
+      ol.Observable.unByKey(this.geometryModifyListenerKeys_[feature_uid]);
+      delete this.geometryModifyListenerKeys_[feature_uid];
+
+      ol.Observable.unByKey(this.geometryChangeListenerKeys_[feature_uid]);
+      delete this.geometryChangeListenerKeys_[feature_uid];
+    }
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.interaction.Snap.prototype.setMap = function(map) {
+  var currentMap = this.getMap();
+  var keys = this.featuresListenerKeys_;
+  var features = this.getFeatures_();
+
+  if (currentMap) {
+    keys.forEach(ol.Observable.unByKey);
+    keys.length = 0;
+    features.forEach(this.forEachFeatureRemove_, this);
+  }
+
+  goog.base(this, 'setMap', map);
+
+  if (map) {
+    if (this.features_) {
+      keys.push(this.features_.on(ol.CollectionEventType.ADD,
+          this.handleFeatureAdd_, this));
+      keys.push(this.features_.on(ol.CollectionEventType.REMOVE,
+          this.handleFeatureRemove_, this));
+    } else if (this.source_) {
+      keys.push(this.source_.on(ol.source.VectorEventType.ADDFEATURE,
+          this.handleFeatureAdd_, this));
+      keys.push(this.source_.on(ol.source.VectorEventType.REMOVEFEATURE,
+          this.handleFeatureRemove_, this));
+    }
+    features.forEach(this.forEachFeatureAdd_, this);
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.interaction.Snap.prototype.shouldStopEvent = goog.functions.FALSE;
+
+
+/**
+ * @param {ol.Pixel} pixel Pixel
+ * @param {ol.Coordinate} pixelCoordinate Coordinate
+ * @param {ol.Map} map Map.
+ * @return {ol.interaction.Snap.ResultType} Snap result
+ */
+ol.interaction.Snap.prototype.snapTo = function(pixel, pixelCoordinate, map) {
+
+  var lowerLeft = map.getCoordinateFromPixel(
+      [pixel[0] - this.pixelTolerance_, pixel[1] + this.pixelTolerance_]);
+  var upperRight = map.getCoordinateFromPixel(
+      [pixel[0] + this.pixelTolerance_, pixel[1] - this.pixelTolerance_]);
+  var box = ol.extent.boundingExtent([lowerLeft, upperRight]);
+
+  var segments = this.rBush_.getInExtent(box);
+  var snappedToVertex = false;
+  var snapped = false;
+  var vertex = null;
+  var vertexPixel = null;
+  if (segments.length > 0) {
+    this.pixelCoordinate_ = pixelCoordinate;
+    segments.sort(this.sortByDistance_);
+    var closestSegment = segments[0].segment;
+    vertex = (ol.coordinate.closestOnSegment(pixelCoordinate,
+        closestSegment));
+    vertexPixel = map.getPixelFromCoordinate(vertex);
+    if (Math.sqrt(ol.coordinate.squaredDistance(pixel, vertexPixel)) <=
+        this.pixelTolerance_) {
+      snapped = true;
+      var pixel1 = map.getPixelFromCoordinate(closestSegment[0]);
+      var pixel2 = map.getPixelFromCoordinate(closestSegment[1]);
+      var squaredDist1 = ol.coordinate.squaredDistance(vertexPixel, pixel1);
+      var squaredDist2 = ol.coordinate.squaredDistance(vertexPixel, pixel2);
+      var dist = Math.sqrt(Math.min(squaredDist1, squaredDist2));
+      snappedToVertex = dist <= this.pixelTolerance_;
+      if (snappedToVertex) {
+        vertex = squaredDist1 > squaredDist2 ?
+            closestSegment[1] : closestSegment[0];
+        vertexPixel = map.getPixelFromCoordinate(vertex);
+        vertexPixel = [Math.round(vertexPixel[0]), Math.round(vertexPixel[1])];
+      }
+    }
+  }
+  return /** @type {ol.interaction.Snap.ResultType} */ ({
+    snapped: snapped,
+    vertex: vertex,
+    vertexPixel: vertexPixel
+  });
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature
+ * @private
+ */
+ol.interaction.Snap.prototype.updateFeature_ = function(feature) {
+  this.removeFeature(feature, false);
+  this.addFeature(feature, false);
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature
+ * @param {ol.geom.GeometryCollection} geometry Geometry.
+ * @private
+ */
+ol.interaction.Snap.prototype.writeGeometryCollectionGeometry_ =
+    function(feature, geometry) {
+  var i, geometries = geometry.getGeometriesArray();
+  for (i = 0; i < geometries.length; ++i) {
+    this.SEGMENT_WRITERS_[geometries[i].getType()].call(
+        this, feature, geometries[i]);
+  }
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature
+ * @param {ol.geom.LineString} geometry Geometry.
+ * @private
+ */
+ol.interaction.Snap.prototype.writeLineStringGeometry_ =
+    function(feature, geometry) {
+  var coordinates = geometry.getCoordinates();
+  var i, ii, segment, segmentData;
+  for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
+    segment = coordinates.slice(i, i + 2);
+    segmentData = /** @type {ol.interaction.Snap.SegmentDataType} */ ({
+      feature: feature,
+      segment: segment
+    });
+    this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
+  }
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature
+ * @param {ol.geom.MultiLineString} geometry Geometry.
+ * @private
+ */
+ol.interaction.Snap.prototype.writeMultiLineStringGeometry_ =
+    function(feature, geometry) {
+  var lines = geometry.getCoordinates();
+  var coordinates, i, ii, j, jj, segment, segmentData;
+  for (j = 0, jj = lines.length; j < jj; ++j) {
+    coordinates = lines[j];
+    for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
+      segment = coordinates.slice(i, i + 2);
+      segmentData = /** @type {ol.interaction.Snap.SegmentDataType} */ ({
+        feature: feature,
+        segment: segment
+      });
+      this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
+    }
+  }
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature
+ * @param {ol.geom.MultiPoint} geometry Geometry.
+ * @private
+ */
+ol.interaction.Snap.prototype.writeMultiPointGeometry_ =
+    function(feature, geometry) {
+  var points = geometry.getCoordinates();
+  var coordinates, i, ii, segmentData;
+  for (i = 0, ii = points.length; i < ii; ++i) {
+    coordinates = points[i];
+    segmentData = /** @type {ol.interaction.Snap.SegmentDataType} */ ({
+      feature: feature,
+      segment: [coordinates, coordinates]
+    });
+    this.rBush_.insert(geometry.getExtent(), segmentData);
+  }
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature
+ * @param {ol.geom.MultiPolygon} geometry Geometry.
+ * @private
+ */
+ol.interaction.Snap.prototype.writeMultiPolygonGeometry_ =
+    function(feature, geometry) {
+  var polygons = geometry.getCoordinates();
+  var coordinates, i, ii, j, jj, k, kk, rings, segment, segmentData;
+  for (k = 0, kk = polygons.length; k < kk; ++k) {
+    rings = polygons[k];
+    for (j = 0, jj = rings.length; j < jj; ++j) {
+      coordinates = rings[j];
+      for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
+        segment = coordinates.slice(i, i + 2);
+        segmentData = /** @type {ol.interaction.Snap.SegmentDataType} */ ({
+          feature: feature,
+          segment: segment
+        });
+        this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
+      }
+    }
+  }
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature
+ * @param {ol.geom.Point} geometry Geometry.
+ * @private
+ */
+ol.interaction.Snap.prototype.writePointGeometry_ =
+    function(feature, geometry) {
+  var coordinates = geometry.getCoordinates();
+  var segmentData = /** @type {ol.interaction.Snap.SegmentDataType} */ ({
+    feature: feature,
+    segment: [coordinates, coordinates]
+  });
+  this.rBush_.insert(geometry.getExtent(), segmentData);
+};
+
+
+/**
+ * @param {ol.Feature} feature Feature
+ * @param {ol.geom.Polygon} geometry Geometry.
+ * @private
+ */
+ol.interaction.Snap.prototype.writePolygonGeometry_ =
+    function(feature, geometry) {
+  var rings = geometry.getCoordinates();
+  var coordinates, i, ii, j, jj, segment, segmentData;
+  for (j = 0, jj = rings.length; j < jj; ++j) {
+    coordinates = rings[j];
+    for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
+      segment = coordinates.slice(i, i + 2);
+      segmentData = /** @type {ol.interaction.Snap.SegmentDataType} */ ({
+        feature: feature,
+        segment: segment
+      });
+      this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
+    }
+  }
+};
+
+
+/**
+ * @typedef {{
+ *     snapped: {boolean},
+ *     vertex: (ol.Coordinate|null),
+ *     vertexPixel: (ol.Pixel|null)
+ * }}
+ */
+ol.interaction.Snap.ResultType;
+
+
+/**
+ * @typedef {{
+ *     feature: ol.Feature,
+ *     segment: Array.<ol.Coordinate>
+ * }}
+ */
+ol.interaction.Snap.SegmentDataType;
+
+
+/**
+ * Handle all pointer events events.
+ * @param {ol.MapBrowserEvent} evt A move event.
+ * @return {boolean} Pass the event to other interactions.
+ * @this {ol.interaction.Snap}
+ * @private
+ */
+ol.interaction.Snap.handleEvent_ = function(evt) {
+  var result = this.snapTo(evt.pixel, evt.coordinate, evt.map);
+  if (result.snapped) {
+    evt.coordinate = result.vertex.slice(0, 2);
+    evt.pixel = result.vertexPixel;
+  }
+  return ol.interaction.Pointer.handleEvent.call(this, evt);
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} evt Event.
+ * @return {boolean} Stop drag sequence?
+ * @this {ol.interaction.Snap}
+ * @private
+ */
+ol.interaction.Snap.handleUpEvent_ = function(evt) {
+  var featuresToUpdate = goog.object.getValues(this.pendingFeatures_);
+  if (featuresToUpdate.length) {
+    featuresToUpdate.forEach(this.updateFeature_, this);
+    this.pendingFeatures_ = {};
+  }
+  return false;
+};
+
+
+/**
+ * Sort segments by distance, helper function
+ * @param {ol.interaction.Snap.SegmentDataType} a
+ * @param {ol.interaction.Snap.SegmentDataType} b
+ * @return {number}
+ * @this {ol.interaction.Snap}
+ */
+ol.interaction.Snap.sortByDistance = function(a, b) {
+  return ol.coordinate.squaredDistanceToSegment(
+      this.pixelCoordinate_, a.segment) -
+      ol.coordinate.squaredDistanceToSegment(
+      this.pixelCoordinate_, b.segment);
+};
+
+goog.provide('ol.interaction.Translate');
+goog.provide('ol.interaction.TranslateEvent');
+
+goog.require('goog.events');
+goog.require('goog.events.Event');
+goog.require('ol.array');
+goog.require('ol.interaction.Pointer');
+
+
+/**
+ * @enum {string}
+ */
+ol.interaction.TranslateEventType = {
+  /**
+   * Triggered upon feature translation start.
+   * @event ol.interaction.TranslateEvent#translatestart
+   * @api
+   */
+  TRANSLATESTART: 'translatestart',
+  /**
+   * Triggered upon feature translation.
+   * @event ol.interaction.TranslateEvent#translating
+   * @api
+   */
+  TRANSLATING: 'translating',
+  /**
+   * Triggered upon feature translation end.
+   * @event ol.interaction.TranslateEvent#translateend
+   * @api
+   */
+  TRANSLATEEND: 'translateend'
+};
+
+
+
+/**
+ * @classdesc
+ * Events emitted by {@link ol.interaction.Translate} instances are instances of
+ * this type.
+ *
+ * @constructor
+ * @extends {goog.events.Event}
+ * @implements {oli.interaction.TranslateEvent}
+ * @param {ol.interaction.TranslateEventType} type Type.
+ * @param {ol.Collection.<ol.Feature>} features The features translated.
+ * @param {ol.Coordinate} coordinate The event coordinate.
+ */
+ol.interaction.TranslateEvent = function(type, features, coordinate) {
+
+  goog.base(this, type);
+
+  /**
+   * The features being translated.
+   * @type {ol.Collection.<ol.Feature>}
+   * @api
+   */
+  this.features = features;
+
+  /**
+   * The coordinate of the drag event.
+   * @const
+   * @type {ol.Coordinate}
+   * @api
+   */
+  this.coordinate = coordinate;
+};
+goog.inherits(ol.interaction.TranslateEvent, goog.events.Event);
+
+
+
+/**
+ * @classdesc
+ * Interaction for translating (moving) features.
+ *
+ * @constructor
+ * @extends {ol.interaction.Pointer}
+ * @fires ol.interaction.TranslateEvent
+ * @param {olx.interaction.TranslateOptions} options Options.
+ * @api
+ */
+ol.interaction.Translate = function(options) {
+  goog.base(this, {
+    handleDownEvent: ol.interaction.Translate.handleDownEvent_,
+    handleDragEvent: ol.interaction.Translate.handleDragEvent_,
+    handleMoveEvent: ol.interaction.Translate.handleMoveEvent_,
+    handleUpEvent: ol.interaction.Translate.handleUpEvent_
+  });
+
+
+  /**
+   * @type {string|undefined}
+   * @private
+   */
+  this.previousCursor_ = undefined;
+
+
+  /**
+   * The last position we translated to.
+   * @type {ol.Coordinate}
+   * @private
+   */
+  this.lastCoordinate_ = null;
+
+
+  /**
+   * @type {ol.Collection.<ol.Feature>}
+   * @private
+   */
+  this.features_ = options.features !== undefined ? options.features : null;
+
+  /**
+   * @type {ol.Feature}
+   * @private
+   */
+  this.lastFeature_ = null;
+};
+goog.inherits(ol.interaction.Translate, ol.interaction.Pointer);
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} event Event.
+ * @return {boolean} Start drag sequence?
+ * @this {ol.interaction.Translate}
+ * @private
+ */
+ol.interaction.Translate.handleDownEvent_ = function(event) {
+  this.lastFeature_ = this.featuresAtPixel_(event.pixel, event.map);
+  if (!this.lastCoordinate_ && this.lastFeature_) {
+    this.lastCoordinate_ = event.coordinate;
+    ol.interaction.Translate.handleMoveEvent_.call(this, event);
+    this.dispatchEvent(
+        new ol.interaction.TranslateEvent(
+            ol.interaction.TranslateEventType.TRANSLATESTART, this.features_,
+            event.coordinate));
+    return true;
+  }
+  return false;
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} event Event.
+ * @return {boolean} Stop drag sequence?
+ * @this {ol.interaction.Translate}
+ * @private
+ */
+ol.interaction.Translate.handleUpEvent_ = function(event) {
+  if (this.lastCoordinate_) {
+    this.lastCoordinate_ = null;
+    ol.interaction.Translate.handleMoveEvent_.call(this, event);
+    this.dispatchEvent(
+        new ol.interaction.TranslateEvent(
+            ol.interaction.TranslateEventType.TRANSLATEEND, this.features_,
+            event.coordinate));
+    return true;
+  }
+  return false;
+};
+
+
+/**
+ * @param {ol.MapBrowserPointerEvent} event Event.
+ * @this {ol.interaction.Translate}
+ * @private
+ */
+ol.interaction.Translate.handleDragEvent_ = function(event) {
+  if (this.lastCoordinate_) {
+    var newCoordinate = event.coordinate;
+    var deltaX = newCoordinate[0] - this.lastCoordinate_[0];
+    var deltaY = newCoordinate[1] - this.lastCoordinate_[1];
+
+    if (this.features_) {
+      this.features_.forEach(function(feature) {
+        var geom = feature.getGeometry();
+        geom.translate(deltaX, deltaY);
+        feature.setGeometry(geom);
+      });
+    } else if (this.lastFeature_) {
+      var geom = this.lastFeature_.getGeometry();
+      geom.translate(deltaX, deltaY);
+      this.lastFeature_.setGeometry(geom);
+    }
+
+    this.lastCoordinate_ = newCoordinate;
+    this.dispatchEvent(
+        new ol.interaction.TranslateEvent(
+            ol.interaction.TranslateEventType.TRANSLATING, this.features_,
+            newCoordinate));
+  }
+};
+
+
+/**
+ * @param {ol.MapBrowserEvent} event Event.
+ * @this {ol.interaction.Translate}
+ * @private
+ */
+ol.interaction.Translate.handleMoveEvent_ = function(event)
+    {
+  var elem = event.map.getTargetElement();
+  var intersectingFeature = event.map.forEachFeatureAtPixel(event.pixel,
+      function(feature) {
+        return feature;
+      });
+
+  if (intersectingFeature) {
+    var isSelected = false;
+
+    if (this.features_ &&
+        ol.array.includes(this.features_.getArray(), intersectingFeature)) {
+      isSelected = true;
+    }
+
+    this.previousCursor_ = elem.style.cursor;
+
+    // WebKit browsers don't support the grab icons without a prefix
+    elem.style.cursor = this.lastCoordinate_ ?
+        '-webkit-grabbing' : (isSelected ? '-webkit-grab' : 'pointer');
+
+    // Thankfully, attempting to set the standard ones will silently fail,
+    // keeping the prefixed icons
+    elem.style.cursor = !this.lastCoordinate_ ?
+        'grabbing' : (isSelected ? 'grab' : 'pointer');
+
+  } else {
+    elem.style.cursor = this.previousCursor_ !== undefined ?
+        this.previousCursor_ : '';
+    this.previousCursor_ = undefined;
+  }
+};
+
+
+/**
+ * Tests to see if the given coordinates intersects any of our selected
+ * features.
+ * @param {ol.Pixel} pixel Pixel coordinate to test for intersection.
+ * @param {ol.Map} map Map to test the intersection on.
+ * @return {ol.Feature} Returns the feature found at the specified pixel
+ * coordinates.
+ * @private
+ */
+ol.interaction.Translate.prototype.featuresAtPixel_ = function(pixel, map) {
+  var found = null;
+
+  var intersectingFeature = map.forEachFeatureAtPixel(pixel,
+      function(feature) {
+        return feature;
+      });
+
+  if (this.features_ &&
+      ol.array.includes(this.features_.getArray(), intersectingFeature)) {
+    found = intersectingFeature;
+  }
+
+  return found;
+};
+
+goog.provide('ol.layer.Heatmap');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.object');
+goog.require('ol');
+goog.require('ol.Object');
+goog.require('ol.dom');
+goog.require('ol.layer.Vector');
+goog.require('ol.math');
+goog.require('ol.render.EventType');
+goog.require('ol.style.Icon');
+goog.require('ol.style.Style');
+
+
+/**
+ * @enum {string}
+ */
+ol.layer.HeatmapLayerProperty = {
+  BLUR: 'blur',
+  GRADIENT: 'gradient',
+  RADIUS: 'radius'
+};
+
+
+
+/**
+ * @classdesc
+ * Layer for rendering vector data as a heatmap.
+ * Note that any property set in the options is set as a {@link ol.Object}
+ * property on the layer object; for example, setting `title: 'My Title'` in the
+ * options means that `title` is observable, and has get/set accessors.
+ *
+ * @constructor
+ * @extends {ol.layer.Vector}
+ * @fires ol.render.Event
+ * @param {olx.layer.HeatmapOptions=} opt_options Options.
+ * @api
+ */
+ol.layer.Heatmap = function(opt_options) {
+  var options = opt_options ? opt_options : {};
+
+  var baseOptions = goog.object.clone(options);
+
+  delete baseOptions.gradient;
+  delete baseOptions.radius;
+  delete baseOptions.blur;
+  delete baseOptions.shadow;
+  delete baseOptions.weight;
+  goog.base(this, /** @type {olx.layer.VectorOptions} */ (baseOptions));
+
+  /**
+   * @private
+   * @type {Uint8ClampedArray}
+   */
+  this.gradient_ = null;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.shadow_ = options.shadow !== undefined ? options.shadow : 250;
+
+  /**
+   * @private
+   * @type {string|undefined}
+   */
+  this.circleImage_ = undefined;
+
+  /**
+   * @private
+   * @type {Array.<Array.<ol.style.Style>>}
+   */
+  this.styleCache_ = null;
+
+  goog.events.listen(this,
+      ol.Object.getChangeEventType(ol.layer.HeatmapLayerProperty.GRADIENT),
+      this.handleGradientChanged_, false, this);
+
+  this.setGradient(options.gradient ?
+      options.gradient : ol.layer.Heatmap.DEFAULT_GRADIENT);
+
+  this.setBlur(options.blur !== undefined ? options.blur : 15);
+
+  this.setRadius(options.radius !== undefined ? options.radius : 8);
+
+  goog.events.listen(this, [
+    ol.Object.getChangeEventType(ol.layer.HeatmapLayerProperty.BLUR),
+    ol.Object.getChangeEventType(ol.layer.HeatmapLayerProperty.RADIUS)
+  ], this.handleStyleChanged_, false, this);
+
+  this.handleStyleChanged_();
+
+  var weight = options.weight ? options.weight : 'weight';
+  var weightFunction;
+  if (goog.isString(weight)) {
+    weightFunction = function(feature) {
+      return feature.get(weight);
+    };
+  } else {
+    weightFunction = weight;
+  }
+  goog.asserts.assert(goog.isFunction(weightFunction),
+      'weightFunction should be a function');
+
+  this.setStyle(goog.bind(function(feature, resolution) {
+    goog.asserts.assert(this.styleCache_, 'this.styleCache_ expected');
+    goog.asserts.assert(this.circleImage_ !== undefined,
+        'this.circleImage_ should be defined');
+    var weight = weightFunction(feature);
+    var opacity = weight !== undefined ? ol.math.clamp(weight, 0, 1) : 1;
+    // cast to 8 bits
+    var index = (255 * opacity) | 0;
+    var style = this.styleCache_[index];
+    if (!style) {
+      style = [
+        new ol.style.Style({
+          image: new ol.style.Icon({
+            opacity: opacity,
+            src: this.circleImage_
+          })
+        })
+      ];
+      this.styleCache_[index] = style;
+    }
+    return style;
+  }, this));
+
+  // For performance reasons, don't sort the features before rendering.
+  // The render order is not relevant for a heatmap representation.
+  this.setRenderOrder(null);
+
+  goog.events.listen(this, ol.render.EventType.RENDER,
+      this.handleRender_, false, this);
+
+};
+goog.inherits(ol.layer.Heatmap, ol.layer.Vector);
+
+
+/**
+ * @const
+ * @type {Array.<string>}
+ */
+ol.layer.Heatmap.DEFAULT_GRADIENT = ['#00f', '#0ff', '#0f0', '#ff0', '#f00'];
+
+
+/**
+ * @param {Array.<string>} colors
+ * @return {Uint8ClampedArray}
+ * @private
+ */
+ol.layer.Heatmap.createGradient_ = function(colors) {
+  var width = 1;
+  var height = 256;
+  var context = ol.dom.createCanvasContext2D(width, height);
+
+  var gradient = context.createLinearGradient(0, 0, width, height);
+  var step = 1 / (colors.length - 1);
+  for (var i = 0, ii = colors.length; i < ii; ++i) {
+    gradient.addColorStop(i * step, colors[i]);
+  }
+
+  context.fillStyle = gradient;
+  context.fillRect(0, 0, width, height);
+
+  return context.getImageData(0, 0, width, height).data;
+};
+
+
+/**
+ * @return {string}
+ * @private
+ */
+ol.layer.Heatmap.prototype.createCircle_ = function() {
+  var radius = this.getRadius();
+  var blur = this.getBlur();
+  goog.asserts.assert(radius !== undefined && blur !== undefined,
+      'radius and blur should be defined');
+  var halfSize = radius + blur + 1;
+  var size = 2 * halfSize;
+  var context = ol.dom.createCanvasContext2D(size, size);
+  context.shadowOffsetX = context.shadowOffsetY = this.shadow_;
+  context.shadowBlur = blur;
+  context.shadowColor = '#000';
+  context.beginPath();
+  var center = halfSize - this.shadow_;
+  context.arc(center, center, radius, 0, Math.PI * 2, true);
+  context.fill();
+  return context.canvas.toDataURL();
+};
+
+
+/**
+ * Return the blur size in pixels.
+ * @return {number} Blur size in pixels.
+ * @api
+ * @observable
+ */
+ol.layer.Heatmap.prototype.getBlur = function() {
+  return /** @type {number} */ (this.get(ol.layer.HeatmapLayerProperty.BLUR));
+};
+
+
+/**
+ * Return the gradient colors as array of strings.
+ * @return {Array.<string>} Colors.
+ * @api
+ * @observable
+ */
+ol.layer.Heatmap.prototype.getGradient = function() {
+  return /** @type {Array.<string>} */ (
+      this.get(ol.layer.HeatmapLayerProperty.GRADIENT));
+};
+
+
+/**
+ * Return the size of the radius in pixels.
+ * @return {number} Radius size in pixel.
+ * @api
+ * @observable
+ */
+ol.layer.Heatmap.prototype.getRadius = function() {
+  return /** @type {number} */ (this.get(ol.layer.HeatmapLayerProperty.RADIUS));
+};
+
+
+/**
+ * @private
+ */
+ol.layer.Heatmap.prototype.handleGradientChanged_ = function() {
+  this.gradient_ = ol.layer.Heatmap.createGradient_(this.getGradient());
+};
+
+
+/**
+ * @private
+ */
+ol.layer.Heatmap.prototype.handleStyleChanged_ = function() {
+  this.circleImage_ = this.createCircle_();
+  this.styleCache_ = new Array(256);
+  this.changed();
+};
+
+
+/**
+ * @param {ol.render.Event} event Post compose event
+ * @private
+ */
+ol.layer.Heatmap.prototype.handleRender_ = function(event) {
+  goog.asserts.assert(event.type == ol.render.EventType.RENDER,
+      'event.type should be RENDER');
+  goog.asserts.assert(this.gradient_, 'this.gradient_ expected');
+  var context = event.context;
+  var canvas = context.canvas;
+  var image = context.getImageData(0, 0, canvas.width, canvas.height);
+  var view8 = image.data;
+  var i, ii, alpha;
+  for (i = 0, ii = view8.length; i < ii; i += 4) {
+    alpha = view8[i + 3] * 4;
+    if (alpha) {
+      view8[i] = this.gradient_[alpha];
+      view8[i + 1] = this.gradient_[alpha + 1];
+      view8[i + 2] = this.gradient_[alpha + 2];
+    }
+  }
+  context.putImageData(image, 0, 0);
+};
+
+
+/**
+ * Set the blur size in pixels.
+ * @param {number} blur Blur size in pixels.
+ * @api
+ * @observable
+ */
+ol.layer.Heatmap.prototype.setBlur = function(blur) {
+  this.set(ol.layer.HeatmapLayerProperty.BLUR, blur);
+};
+
+
+/**
+ * Set the gradient colors as array of strings.
+ * @param {Array.<string>} colors Gradient.
+ * @api
+ * @observable
+ */
+ol.layer.Heatmap.prototype.setGradient = function(colors) {
+  this.set(ol.layer.HeatmapLayerProperty.GRADIENT, colors);
+};
+
+
+/**
+ * Set the size of the radius in pixels.
+ * @param {number} radius Radius size in pixel.
+ * @api
+ * @observable
+ */
+ol.layer.Heatmap.prototype.setRadius = function(radius) {
+  this.set(ol.layer.HeatmapLayerProperty.RADIUS, radius);
+};
+
+goog.provide('ol.raster.Operation');
+goog.provide('ol.raster.OperationType');
+
+
+/**
+ * Raster operation type. Supported values are `'pixel'` and `'image'`.
+ * @enum {string}
+ * @api
+ */
+ol.raster.OperationType = {
+  PIXEL: 'pixel',
+  IMAGE: 'image'
+};
+
+
+/**
+ * A function that takes an array of input data, performs some operation, and
+ * returns an array of ouput data.  For `'pixel'` type operations, functions
+ * will be called with an array of {@link ol.raster.Pixel} data and should
+ * return an array of the same.  For `'image'` type operations, functions will
+ * be called with an array of {@link ImageData
+ * https://developer.mozilla.org/en-US/docs/Web/API/ImageData} and should return
+ * an array of the same.  The operations are called with a second "data"
+ * argument, which can be used for storage.  The data object is accessible
+ * from raster events, where it can be initialized in "beforeoperations" and
+ * accessed again in "afteroperations".
+ *
+ * @typedef {function((Array.<ol.raster.Pixel>|Array.<ImageData>), Object):
+ *     (Array.<ol.raster.Pixel>|Array.<ImageData>)}
+ * @api
+ */
+ol.raster.Operation;
+
+goog.provide('ol.raster.Pixel');
+
+
+/**
+ * An array of numbers representing pixel values.
+ * @typedef {Array.<number>} ol.raster.Pixel
+ * @api
+ */
+ol.raster.Pixel;
+
+goog.provide('ol.render');
+
+goog.require('goog.vec.Mat4');
+goog.require('ol.render.canvas.Immediate');
+goog.require('ol.vec.Mat4');
+
+
+/**
+ * Binds a Canvas Immediate API to a canvas context, to allow drawing geometries
+ * to the context's canvas.
+ *
+ * The units for geometry coordinates are css pixels relative to the top left
+ * corner of the canvas element.
+ * ```js
+ * var canvas = document.createElement('canvas');
+ * var render = ol.render.toContext(canvas.getContext('2d'),
+ *     { size: [100, 100] });
+ * render.setFillStrokeStyle(new ol.style.Fill({ color: blue }));
+ * render.drawPolygonGeometry(
+ *     new ol.geom.Polygon([[[0, 0], [100, 100], [100, 0], [0, 0]]]));
+ * ```
+ *
+ * Note that {@link ol.render.canvas.Immediate#drawAsync} and
+ * {@link ol.render.canvas.Immediate#drawFeature} cannot be used.
+ *
+ * @param {CanvasRenderingContext2D} context Canvas context.
+ * @param {olx.render.ToContextOptions=} opt_options Options.
+ * @return {ol.render.canvas.Immediate} Canvas Immediate.
+ * @api
+ */
+ol.render.toContext = function(context, opt_options) {
+  var canvas = context.canvas;
+  var options = opt_options ? opt_options : {};
+  var pixelRatio = options.pixelRatio || ol.has.DEVICE_PIXEL_RATIO;
+  var size = options.size;
+  if (size) {
+    canvas.width = size[0] * pixelRatio;
+    canvas.height = size[1] * pixelRatio;
+    canvas.style.width = size[0] + 'px';
+    canvas.style.height = size[1] + 'px';
+  }
+  var extent = [0, 0, canvas.width, canvas.height];
+  var transform = ol.vec.Mat4.makeTransform2D(goog.vec.Mat4.createNumber(),
+      0, 0, pixelRatio, pixelRatio, 0, 0, 0);
+  return new ol.render.canvas.Immediate(context, pixelRatio, extent, transform,
+      0);
+};
+
+goog.provide('ol.reproj.Tile');
+goog.provide('ol.reproj.TileFunctionType');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('goog.math');
+goog.require('goog.object');
+goog.require('ol.Tile');
+goog.require('ol.TileState');
+goog.require('ol.extent');
+goog.require('ol.math');
+goog.require('ol.proj');
+goog.require('ol.reproj');
+goog.require('ol.reproj.Triangulation');
+
+
+/**
+ * @typedef {function(number, number, number, number) : ol.Tile}
+ */
+ol.reproj.TileFunctionType;
+
+
+
+/**
+ * @classdesc
+ * Class encapsulating single reprojected tile.
+ * See {@link ol.source.TileImage}.
+ *
+ * @constructor
+ * @extends {ol.Tile}
+ * @param {ol.proj.Projection} sourceProj Source projection.
+ * @param {ol.tilegrid.TileGrid} sourceTileGrid Source tile grid.
+ * @param {ol.proj.Projection} targetProj Target projection.
+ * @param {ol.tilegrid.TileGrid} targetTileGrid Target tile grid.
+ * @param {ol.TileCoord} tileCoord Coordinate of the tile.
+ * @param {ol.TileCoord} wrappedTileCoord Coordinate of the tile wrapped in X.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.reproj.TileFunctionType} getTileFunction
+ *     Function returning source tiles (z, x, y, pixelRatio).
+ * @param {number=} opt_errorThreshold Acceptable reprojection error (in px).
+ * @param {boolean=} opt_renderEdges Render reprojection edges.
+ */
+ol.reproj.Tile = function(sourceProj, sourceTileGrid,
+    targetProj, targetTileGrid, tileCoord, wrappedTileCoord,
+    pixelRatio, getTileFunction,
+    opt_errorThreshold,
+    opt_renderEdges) {
+  goog.base(this, tileCoord, ol.TileState.IDLE);
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.renderEdges_ = opt_renderEdges !== undefined ? opt_renderEdges : false;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.pixelRatio_ = pixelRatio;
+
+  /**
+   * @private
+   * @type {HTMLCanvasElement}
+   */
+  this.canvas_ = null;
+
+  /**
+   * @private
+   * @type {Object.<number, HTMLCanvasElement>}
+   */
+  this.canvasByContext_ = {};
+
+  /**
+   * @private
+   * @type {ol.tilegrid.TileGrid}
+   */
+  this.sourceTileGrid_ = sourceTileGrid;
+
+  /**
+   * @private
+   * @type {ol.tilegrid.TileGrid}
+   */
+  this.targetTileGrid_ = targetTileGrid;
+
+  /**
+   * @private
+   * @type {ol.TileCoord}
+   */
+  this.wrappedTileCoord_ = wrappedTileCoord ? wrappedTileCoord : tileCoord;
+
+  /**
+   * @private
+   * @type {!Array.<ol.Tile>}
+   */
+  this.sourceTiles_ = [];
+
+  /**
+   * @private
+   * @type {Array.<goog.events.Key>}
+   */
+  this.sourcesListenerKeys_ = null;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.sourceZ_ = 0;
+
+  var targetExtent = targetTileGrid.getTileCoordExtent(this.wrappedTileCoord_);
+  var maxTargetExtent = this.targetTileGrid_.getExtent();
+  var maxSourceExtent = this.sourceTileGrid_.getExtent();
+
+  var limitedTargetExtent = maxTargetExtent ?
+      ol.extent.getIntersection(targetExtent, maxTargetExtent) : targetExtent;
+
+  if (ol.extent.getArea(limitedTargetExtent) === 0) {
+    // Tile is completely outside range -> EMPTY
+    // TODO: is it actually correct that the source even creates the tile ?
+    this.state = ol.TileState.EMPTY;
+    return;
+  }
+
+  var sourceProjExtent = sourceProj.getExtent();
+  if (sourceProjExtent) {
+    if (!maxSourceExtent) {
+      maxSourceExtent = sourceProjExtent;
+    } else {
+      maxSourceExtent = ol.extent.getIntersection(
+          maxSourceExtent, sourceProjExtent);
+    }
+  }
+
+  var targetResolution = targetTileGrid.getResolution(
+      this.wrappedTileCoord_[0]);
+
+  var targetCenter = ol.extent.getCenter(limitedTargetExtent);
+  var sourceResolution = ol.reproj.calculateSourceResolution(
+      sourceProj, targetProj, targetCenter, targetResolution);
+
+  if (!goog.math.isFiniteNumber(sourceResolution) || sourceResolution <= 0) {
+    // invalid sourceResolution -> EMPTY
+    // probably edges of the projections when no extent is defined
+    this.state = ol.TileState.EMPTY;
+    return;
+  }
+
+  var errorThresholdInPixels = opt_errorThreshold !== undefined ?
+      opt_errorThreshold : ol.DEFAULT_RASTER_REPROJECTION_ERROR_THRESHOLD;
+
+  /**
+   * @private
+   * @type {!ol.reproj.Triangulation}
+   */
+  this.triangulation_ = new ol.reproj.Triangulation(
+      sourceProj, targetProj, limitedTargetExtent, maxSourceExtent,
+      sourceResolution * errorThresholdInPixels);
+
+  if (this.triangulation_.getTriangles().length === 0) {
+    // no valid triangles -> EMPTY
+    this.state = ol.TileState.EMPTY;
+    return;
+  }
+
+  this.sourceZ_ = sourceTileGrid.getZForResolution(sourceResolution);
+  var sourceExtent = this.triangulation_.calculateSourceExtent();
+
+  if (maxSourceExtent) {
+    if (sourceProj.canWrapX()) {
+      sourceExtent[1] = ol.math.clamp(
+          sourceExtent[1], maxSourceExtent[1], maxSourceExtent[3]);
+      sourceExtent[3] = ol.math.clamp(
+          sourceExtent[3], maxSourceExtent[1], maxSourceExtent[3]);
+    } else {
+      sourceExtent = ol.extent.getIntersection(sourceExtent, maxSourceExtent);
+    }
+  }
+
+  if (!ol.extent.getArea(sourceExtent)) {
+    this.state = ol.TileState.EMPTY;
+  } else {
+    var sourceRange = sourceTileGrid.getTileRangeForExtentAndZ(
+        sourceExtent, this.sourceZ_);
+
+    var tilesRequired = sourceRange.getWidth() * sourceRange.getHeight();
+    if (!goog.asserts.assert(
+        tilesRequired < ol.RASTER_REPROJECTION_MAX_SOURCE_TILES,
+        'reasonable number of tiles is required')) {
+      this.state = ol.TileState.ERROR;
+      return;
+    }
+    for (var srcX = sourceRange.minX; srcX <= sourceRange.maxX; srcX++) {
+      for (var srcY = sourceRange.minY; srcY <= sourceRange.maxY; srcY++) {
+        var tile = getTileFunction(this.sourceZ_, srcX, srcY, pixelRatio);
+        if (tile) {
+          this.sourceTiles_.push(tile);
+        }
+      }
+    }
+
+    if (this.sourceTiles_.length === 0) {
+      this.state = ol.TileState.EMPTY;
+    }
+  }
+};
+goog.inherits(ol.reproj.Tile, ol.Tile);
+
+
+/**
+ * @inheritDoc
+ */
+ol.reproj.Tile.prototype.disposeInternal = function() {
+  if (this.state == ol.TileState.LOADING) {
+    this.unlistenSources_();
+  }
+  goog.base(this, 'disposeInternal');
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.reproj.Tile.prototype.getImage = function(opt_context) {
+  if (opt_context !== undefined) {
+    var image;
+    var key = goog.getUid(opt_context);
+    if (key in this.canvasByContext_) {
+      return this.canvasByContext_[key];
+    } else if (goog.object.isEmpty(this.canvasByContext_)) {
+      image = this.canvas_;
+    } else {
+      image = /** @type {HTMLCanvasElement} */ (this.canvas_.cloneNode(false));
+    }
+    this.canvasByContext_[key] = image;
+    return image;
+  } else {
+    return this.canvas_;
+  }
+};
+
+
+/**
+ * @private
+ */
+ol.reproj.Tile.prototype.reproject_ = function() {
+  var sources = [];
+  this.sourceTiles_.forEach(function(tile, i, arr) {
+    if (tile && tile.getState() == ol.TileState.LOADED) {
+      sources.push({
+        extent: this.sourceTileGrid_.getTileCoordExtent(tile.tileCoord),
+        image: tile.getImage()
+      });
+    }
+  }, this);
+  this.sourceTiles_.length = 0;
+
+  var z = this.wrappedTileCoord_[0];
+  var size = this.targetTileGrid_.getTileSize(z);
+  var width = goog.isNumber(size) ? size : size[0];
+  var height = goog.isNumber(size) ? size : size[1];
+  var targetResolution = this.targetTileGrid_.getResolution(z);
+  var sourceResolution = this.sourceTileGrid_.getResolution(this.sourceZ_);
+
+  var targetExtent = this.targetTileGrid_.getTileCoordExtent(
+      this.wrappedTileCoord_);
+  this.canvas_ = ol.reproj.render(width, height, this.pixelRatio_,
+      sourceResolution, this.sourceTileGrid_.getExtent(),
+      targetResolution, targetExtent, this.triangulation_, sources,
+      this.renderEdges_);
+
+  this.state = ol.TileState.LOADED;
+  this.changed();
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.reproj.Tile.prototype.load = function() {
+  if (this.state == ol.TileState.IDLE) {
+    this.state = ol.TileState.LOADING;
+    this.changed();
+
+    var leftToLoad = 0;
+
+    goog.asserts.assert(!this.sourcesListenerKeys_,
+        'this.sourcesListenerKeys_ should be null');
+
+    this.sourcesListenerKeys_ = [];
+    this.sourceTiles_.forEach(function(tile, i, arr) {
+      var state = tile.getState();
+      if (state == ol.TileState.IDLE || state == ol.TileState.LOADING) {
+        leftToLoad++;
+
+        var sourceListenKey;
+        sourceListenKey = tile.listen(goog.events.EventType.CHANGE,
+            function(e) {
+              var state = tile.getState();
+              if (state == ol.TileState.LOADED ||
+                  state == ol.TileState.ERROR ||
+                  state == ol.TileState.EMPTY) {
+                goog.events.unlistenByKey(sourceListenKey);
+                leftToLoad--;
+                goog.asserts.assert(leftToLoad >= 0,
+                    'leftToLoad should not be negative');
+                if (leftToLoad === 0) {
+                  this.unlistenSources_();
+                  this.reproject_();
+                }
+              }
+            }, false, this);
+        this.sourcesListenerKeys_.push(sourceListenKey);
+      }
+    }, this);
+
+    this.sourceTiles_.forEach(function(tile, i, arr) {
+      var state = tile.getState();
+      if (state == ol.TileState.IDLE) {
+        tile.load();
+      }
+    });
+
+    if (leftToLoad === 0) {
+      this.reproject_();
+    }
+  }
+};
+
+
+/**
+ * @private
+ */
+ol.reproj.Tile.prototype.unlistenSources_ = function() {
+  goog.asserts.assert(this.sourcesListenerKeys_,
+      'this.sourcesListenerKeys_ should not be null');
+  this.sourcesListenerKeys_.forEach(goog.events.unlistenByKey);
+  this.sourcesListenerKeys_ = null;
+};
+
+// Copyright 2011 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview A utility to load JavaScript files via DOM script tags.
+ * Refactored from goog.net.Jsonp. Works cross-domain.
+ *
+ */
+
+goog.provide('goog.net.jsloader');
+goog.provide('goog.net.jsloader.Error');
+goog.provide('goog.net.jsloader.ErrorCode');
+goog.provide('goog.net.jsloader.Options');
+
+goog.require('goog.array');
+goog.require('goog.async.Deferred');
+goog.require('goog.debug.Error');
+goog.require('goog.dom');
+goog.require('goog.dom.TagName');
+goog.require('goog.object');
+
+
+/**
+ * The name of the property of goog.global under which the JavaScript
+ * verification object is stored by the loaded script.
+ * @private {string}
+ */
+goog.net.jsloader.GLOBAL_VERIFY_OBJS_ = 'closure_verification';
+
+
+/**
+ * The default length of time, in milliseconds, we are prepared to wait for a
+ * load request to complete.
+ * @type {number}
+ */
+goog.net.jsloader.DEFAULT_TIMEOUT = 5000;
+
+
+/**
+ * Optional parameters for goog.net.jsloader.send.
+ * timeout: The length of time, in milliseconds, we are prepared to wait
+ *     for a load request to complete. Default it 5 seconds.
+ * document: The HTML document under which to load the JavaScript. Default is
+ *     the current document.
+ * cleanupWhenDone: If true clean up the script tag after script completes to
+ *     load. This is important if you just want to read data from the JavaScript
+ *     and then throw it away. Default is false.
+ * attributes: Additional attributes to set on the script tag.
+ *
+ * @typedef {{
+ *   timeout: (number|undefined),
+ *   document: (HTMLDocument|undefined),
+ *   cleanupWhenDone: (boolean|undefined),
+ *   attributes: (!Object<string, string>|undefined)
+ * }}
+ */
+goog.net.jsloader.Options;
+
+
+/**
+ * Scripts (URIs) waiting to be loaded.
+ * @private {!Array<string>}
+ */
+goog.net.jsloader.scriptsToLoad_ = [];
+
+
+/**
+ * The deferred result of loading the URIs in scriptsToLoad_.
+ * We need to return this to a caller that wants to load URIs while
+ * a deferred is already working on them.
+ * @private {!goog.async.Deferred<null>}
+ */
+goog.net.jsloader.scriptLoadingDeferred_;
+
+
+/**
+ * Loads and evaluates the JavaScript files at the specified URIs, guaranteeing
+ * the order of script loads.
+ *
+ * Because we have to load the scripts in serial (load script 1, exec script 1,
+ * load script 2, exec script 2, and so on), this will be slower than doing
+ * the network fetches in parallel.
+ *
+ * If you need to load a large number of scripts but dependency order doesn't
+ * matter, you should just call goog.net.jsloader.load N times.
+ *
+ * If you need to load a large number of scripts on the same domain,
+ * you may want to use goog.module.ModuleLoader.
+ *
+ * @param {Array<string>} uris The URIs to load.
+ * @param {goog.net.jsloader.Options=} opt_options Optional parameters. See
+ *     goog.net.jsloader.options documentation for details.
+ * @return {!goog.async.Deferred} The deferred result, that may be used to add
+ *     callbacks
+ */
+goog.net.jsloader.loadMany = function(uris, opt_options) {
+  // Loading the scripts in serial introduces asynchronosity into the flow.
+  // Therefore, there are race conditions where client A can kick off the load
+  // sequence for client B, even though client A's scripts haven't all been
+  // loaded yet.
+  //
+  // To work around this issue, all module loads share a queue.
+  if (!uris.length) {
+    return goog.async.Deferred.succeed(null);
+  }
+
+  var isAnotherModuleLoading = goog.net.jsloader.scriptsToLoad_.length;
+  goog.array.extend(goog.net.jsloader.scriptsToLoad_, uris);
+  if (isAnotherModuleLoading) {
+    // jsloader is still loading some other scripts.
+    // In order to prevent the race condition noted above, we just add
+    // these URIs to the end of the scripts' queue and return the deferred
+    // result of the ongoing script load, so the caller knows when they
+    // finish loading.
+    return goog.net.jsloader.scriptLoadingDeferred_;
+  }
+
+  uris = goog.net.jsloader.scriptsToLoad_;
+  var popAndLoadNextScript = function() {
+    var uri = uris.shift();
+    var deferred = goog.net.jsloader.load(uri, opt_options);
+    if (uris.length) {
+      deferred.addBoth(popAndLoadNextScript);
+    }
+    return deferred;
+  };
+  goog.net.jsloader.scriptLoadingDeferred_ = popAndLoadNextScript();
+  return goog.net.jsloader.scriptLoadingDeferred_;
+};
+
+
+/**
+ * Loads and evaluates a JavaScript file.
+ * When the script loads, a user callback is called.
+ * It is the client's responsibility to verify that the script ran successfully.
+ *
+ * @param {string} uri The URI of the JavaScript.
+ * @param {goog.net.jsloader.Options=} opt_options Optional parameters. See
+ *     goog.net.jsloader.Options documentation for details.
+ * @return {!goog.async.Deferred} The deferred result, that may be used to add
+ *     callbacks and/or cancel the transmission.
+ *     The error callback will be called with a single goog.net.jsloader.Error
+ *     parameter.
+ */
+goog.net.jsloader.load = function(uri, opt_options) {
+  var options = opt_options || {};
+  var doc = options.document || document;
+
+  var script = goog.dom.createElement(goog.dom.TagName.SCRIPT);
+  var request = {script_: script, timeout_: undefined};
+  var deferred = new goog.async.Deferred(goog.net.jsloader.cancel_, request);
+
+  // Set a timeout.
+  var timeout = null;
+  var timeoutDuration = goog.isDefAndNotNull(options.timeout) ?
+      options.timeout : goog.net.jsloader.DEFAULT_TIMEOUT;
+  if (timeoutDuration > 0) {
+    timeout = window.setTimeout(function() {
+      goog.net.jsloader.cleanup_(script, true);
+      deferred.errback(new goog.net.jsloader.Error(
+          goog.net.jsloader.ErrorCode.TIMEOUT,
+          'Timeout reached for loading script ' + uri));
+    }, timeoutDuration);
+    request.timeout_ = timeout;
+  }
+
+  // Hang the user callback to be called when the script completes to load.
+  // NOTE(user): This callback will be called in IE even upon error. In any
+  // case it is the client's responsibility to verify that the script ran
+  // successfully.
+  script.onload = script.onreadystatechange = function() {
+    if (!script.readyState || script.readyState == 'loaded' ||
+        script.readyState == 'complete') {
+      var removeScriptNode = options.cleanupWhenDone || false;
+      goog.net.jsloader.cleanup_(script, removeScriptNode, timeout);
+      deferred.callback(null);
+    }
+  };
+
+  // Add an error callback.
+  // NOTE(user): Not supported in IE.
+  script.onerror = function() {
+    goog.net.jsloader.cleanup_(script, true, timeout);
+    deferred.errback(new goog.net.jsloader.Error(
+        goog.net.jsloader.ErrorCode.LOAD_ERROR,
+        'Error while loading script ' + uri));
+  };
+
+  var properties = options.attributes || {};
+  goog.object.extend(properties, {
+    'type': 'text/javascript',
+    'charset': 'UTF-8',
+    // NOTE(user): Safari never loads the script if we don't set
+    // the src attribute before appending.
+    'src': uri
+  });
+  goog.dom.setProperties(script, properties);
+  var scriptParent = goog.net.jsloader.getScriptParentElement_(doc);
+  scriptParent.appendChild(script);
+
+  return deferred;
+};
+
+
+/**
+ * Loads a JavaScript file and verifies it was evaluated successfully, using a
+ * verification object.
+ * The verification object is set by the loaded JavaScript at the end of the
+ * script.
+ * We verify this object was set and return its value in the success callback.
+ * If the object is not defined we trigger an error callback.
+ *
+ * @param {string} uri The URI of the JavaScript.
+ * @param {string} verificationObjName The name of the verification object that
+ *     the loaded script should set.
+ * @param {goog.net.jsloader.Options} options Optional parameters. See
+ *     goog.net.jsloader.Options documentation for details.
+ * @return {!goog.async.Deferred} The deferred result, that may be used to add
+ *     callbacks and/or cancel the transmission.
+ *     The success callback will be called with a single parameter containing
+ *     the value of the verification object.
+ *     The error callback will be called with a single goog.net.jsloader.Error
+ *     parameter.
+ */
+goog.net.jsloader.loadAndVerify = function(uri, verificationObjName, options) {
+  // Define the global objects variable.
+  if (!goog.global[goog.net.jsloader.GLOBAL_VERIFY_OBJS_]) {
+    goog.global[goog.net.jsloader.GLOBAL_VERIFY_OBJS_] = {};
+  }
+  var verifyObjs = goog.global[goog.net.jsloader.GLOBAL_VERIFY_OBJS_];
+
+  // Verify that the expected object does not exist yet.
+  if (goog.isDef(verifyObjs[verificationObjName])) {
+    // TODO(user): Error or reset variable?
+    return goog.async.Deferred.fail(new goog.net.jsloader.Error(
+        goog.net.jsloader.ErrorCode.VERIFY_OBJECT_ALREADY_EXISTS,
+        'Verification object ' + verificationObjName + ' already defined.'));
+  }
+
+  // Send request to load the JavaScript.
+  var sendDeferred = goog.net.jsloader.load(uri, options);
+
+  // Create a deferred object wrapping the send result.
+  var deferred = new goog.async.Deferred(
+      goog.bind(sendDeferred.cancel, sendDeferred));
+
+  // Call user back with object that was set by the script.
+  sendDeferred.addCallback(function() {
+    var result = verifyObjs[verificationObjName];
+    if (goog.isDef(result)) {
+      deferred.callback(result);
+      delete verifyObjs[verificationObjName];
+    } else {
+      // Error: script was not loaded properly.
+      deferred.errback(new goog.net.jsloader.Error(
+          goog.net.jsloader.ErrorCode.VERIFY_ERROR,
+          'Script ' + uri + ' loaded, but verification object ' +
+          verificationObjName + ' was not defined.'));
+    }
+  });
+
+  // Pass error to new deferred object.
+  sendDeferred.addErrback(function(error) {
+    if (goog.isDef(verifyObjs[verificationObjName])) {
+      delete verifyObjs[verificationObjName];
+    }
+    deferred.errback(error);
+  });
+
+  return deferred;
+};
+
+
+/**
+ * Gets the DOM element under which we should add new script elements.
+ * How? Take the first head element, and if not found take doc.documentElement,
+ * which always exists.
+ *
+ * @param {!HTMLDocument} doc The relevant document.
+ * @return {!Element} The script parent element.
+ * @private
+ */
+goog.net.jsloader.getScriptParentElement_ = function(doc) {
+  var headElements = doc.getElementsByTagName(goog.dom.TagName.HEAD);
+  if (!headElements || goog.array.isEmpty(headElements)) {
+    return doc.documentElement;
+  } else {
+    return headElements[0];
+  }
+};
+
+
+/**
+ * Cancels a given request.
+ * @this {{script_: Element, timeout_: number}} The request context.
+ * @private
+ */
+goog.net.jsloader.cancel_ = function() {
+  var request = this;
+  if (request && request.script_) {
+    var scriptNode = request.script_;
+    if (scriptNode && scriptNode.tagName == goog.dom.TagName.SCRIPT) {
+      goog.net.jsloader.cleanup_(scriptNode, true, request.timeout_);
+    }
+  }
+};
+
+
+/**
+ * Removes the script node and the timeout.
+ *
+ * @param {Node} scriptNode The node to be cleaned up.
+ * @param {boolean} removeScriptNode If true completely remove the script node.
+ * @param {?number=} opt_timeout The timeout handler to cleanup.
+ * @private
+ */
+goog.net.jsloader.cleanup_ = function(scriptNode, removeScriptNode,
+                                      opt_timeout) {
+  if (goog.isDefAndNotNull(opt_timeout)) {
+    goog.global.clearTimeout(opt_timeout);
+  }
+
+  scriptNode.onload = goog.nullFunction;
+  scriptNode.onerror = goog.nullFunction;
+  scriptNode.onreadystatechange = goog.nullFunction;
+
+  // Do this after a delay (removing the script node of a running script can
+  // confuse older IEs).
+  if (removeScriptNode) {
+    window.setTimeout(function() {
+      goog.dom.removeNode(scriptNode);
+    }, 0);
+  }
+};
+
+
+/**
+ * Possible error codes for jsloader.
+ * @enum {number}
+ */
+goog.net.jsloader.ErrorCode = {
+  LOAD_ERROR: 0,
+  TIMEOUT: 1,
+  VERIFY_ERROR: 2,
+  VERIFY_OBJECT_ALREADY_EXISTS: 3
+};
+
+
+
+/**
+ * A jsloader error.
+ *
+ * @param {goog.net.jsloader.ErrorCode} code The error code.
+ * @param {string=} opt_message Additional message.
+ * @constructor
+ * @extends {goog.debug.Error}
+ * @final
+ */
+goog.net.jsloader.Error = function(code, opt_message) {
+  var msg = 'Jsloader error (code #' + code + ')';
+  if (opt_message) {
+    msg += ': ' + opt_message;
+  }
+  goog.net.jsloader.Error.base(this, 'constructor', msg);
+
+  /**
+   * The code for this error.
+   *
+   * @type {goog.net.jsloader.ErrorCode}
+   */
+  this.code = code;
+};
+goog.inherits(goog.net.jsloader.Error, goog.debug.Error);
+
+// Copyright 2006 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// The original file lives here: http://go/cross_domain_channel.js
+
+/**
+ * @fileoverview Implements a cross-domain communication channel. A
+ * typical web page is prevented by browser security from sending
+ * request, such as a XMLHttpRequest, to other servers than the ones
+ * from which it came. The Jsonp class provides a workaround by
+ * using dynamically generated script tags. Typical usage:.
+ *
+ * var jsonp = new goog.net.Jsonp(new goog.Uri('http://my.host.com/servlet'));
+ * var payload = { 'foo': 1, 'bar': true };
+ * jsonp.send(payload, function(reply) { alert(reply) });
+ *
+ * This script works in all browsers that are currently supported by
+ * the Google Maps API, which is IE 6.0+, Firefox 0.8+, Safari 1.2.4+,
+ * Netscape 7.1+, Mozilla 1.4+, Opera 8.02+.
+ *
+ */
+
+goog.provide('goog.net.Jsonp');
+
+goog.require('goog.Uri');
+goog.require('goog.net.jsloader');
+
+// WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
+//
+// This class allows us (Google) to send data from non-Google and thus
+// UNTRUSTED pages to our servers. Under NO CIRCUMSTANCES return
+// anything sensitive, such as session or cookie specific data. Return
+// only data that you want parties external to Google to have. Also
+// NEVER use this method to send data from web pages to untrusted
+// servers, or redirects to unknown servers (www.google.com/cache,
+// /q=xx&btnl, /url, www.googlepages.com, etc.)
+//
+// WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
+
+
+
+/**
+ * Creates a new cross domain channel that sends data to the specified
+ * host URL. By default, if no reply arrives within 5s, the channel
+ * assumes the call failed to complete successfully.
+ *
+ * @param {goog.Uri|string} uri The Uri of the server side code that receives
+ *     data posted through this channel (e.g.,
+ *     "http://maps.google.com/maps/geo").
+ *
+ * @param {string=} opt_callbackParamName The parameter name that is used to
+ *     specify the callback. Defaults to "callback".
+ *
+ * @constructor
+ * @final
+ */
+goog.net.Jsonp = function(uri, opt_callbackParamName) {
+  /**
+   * The uri_ object will be used to encode the payload that is sent to the
+   * server.
+   * @type {goog.Uri}
+   * @private
+   */
+  this.uri_ = new goog.Uri(uri);
+
+  /**
+   * This is the callback parameter name that is added to the uri.
+   * @type {string}
+   * @private
+   */
+  this.callbackParamName_ = opt_callbackParamName ?
+      opt_callbackParamName : 'callback';
+
+  /**
+   * The length of time, in milliseconds, this channel is prepared
+   * to wait for for a request to complete. The default value is 5 seconds.
+   * @type {number}
+   * @private
+   */
+  this.timeout_ = 5000;
+};
+
+
+/**
+ * The name of the property of goog.global under which the callback is
+ * stored.
+ */
+goog.net.Jsonp.CALLBACKS = '_callbacks_';
+
+
+/**
+ * Used to generate unique callback IDs. The counter must be global because
+ * all channels share a common callback object.
+ * @private
+ */
+goog.net.Jsonp.scriptCounter_ = 0;
+
+
+/**
+ * Sets the length of time, in milliseconds, this channel is prepared
+ * to wait for for a request to complete. If the call is not competed
+ * within the set time span, it is assumed to have failed. To wait
+ * indefinitely for a request to complete set the timout to a negative
+ * number.
+ *
+ * @param {number} timeout The length of time before calls are
+ * interrupted.
+ */
+goog.net.Jsonp.prototype.setRequestTimeout = function(timeout) {
+  this.timeout_ = timeout;
+};
+
+
+/**
+ * Returns the current timeout value, in milliseconds.
+ *
+ * @return {number} The timeout value.
+ */
+goog.net.Jsonp.prototype.getRequestTimeout = function() {
+  return this.timeout_;
+};
+
+
+/**
+ * Sends the given payload to the URL specified at the construction
+ * time. The reply is delivered to the given replyCallback. If the
+ * errorCallback is specified and the reply does not arrive within the
+ * timeout period set on this channel, the errorCallback is invoked
+ * with the original payload.
+ *
+ * If no reply callback is specified, then the response is expected to
+ * consist of calls to globally registered functions. No &callback=
+ * URL parameter will be sent in the request, and the script element
+ * will be cleaned up after the timeout.
+ *
+ * @param {Object=} opt_payload Name-value pairs.  If given, these will be
+ *     added as parameters to the supplied URI as GET parameters to the
+ *     given server URI.
+ *
+ * @param {Function=} opt_replyCallback A function expecting one
+ *     argument, called when the reply arrives, with the response data.
+ *
+ * @param {Function=} opt_errorCallback A function expecting one
+ *     argument, called on timeout, with the payload (if given), otherwise
+ *     null.
+ *
+ * @param {string=} opt_callbackParamValue Value to be used as the
+ *     parameter value for the callback parameter (callbackParamName).
+ *     To be used when the value needs to be fixed by the client for a
+ *     particular request, to make use of the cached responses for the request.
+ *     NOTE: If multiple requests are made with the same
+ *     opt_callbackParamValue, only the last call will work whenever the
+ *     response comes back.
+ *
+ * @return {!Object} A request descriptor that may be used to cancel this
+ *     transmission, or null, if the message may not be cancelled.
+ */
+goog.net.Jsonp.prototype.send = function(opt_payload,
+                                         opt_replyCallback,
+                                         opt_errorCallback,
+                                         opt_callbackParamValue) {
+
+  var payload = opt_payload || null;
+
+  var id = opt_callbackParamValue ||
+      '_' + (goog.net.Jsonp.scriptCounter_++).toString(36) +
+      goog.now().toString(36);
+
+  if (!goog.global[goog.net.Jsonp.CALLBACKS]) {
+    goog.global[goog.net.Jsonp.CALLBACKS] = {};
+  }
+
+  // Create a new Uri object onto which this payload will be added
+  var uri = this.uri_.clone();
+  if (payload) {
+    goog.net.Jsonp.addPayloadToUri_(payload, uri);
+  }
+
+  if (opt_replyCallback) {
+    var reply = goog.net.Jsonp.newReplyHandler_(id, opt_replyCallback);
+    goog.global[goog.net.Jsonp.CALLBACKS][id] = reply;
+
+    uri.setParameterValues(this.callbackParamName_,
+                           goog.net.Jsonp.CALLBACKS + '.' + id);
+  }
+
+  var deferred = goog.net.jsloader.load(uri.toString(),
+      {timeout: this.timeout_, cleanupWhenDone: true});
+  var error = goog.net.Jsonp.newErrorHandler_(id, payload, opt_errorCallback);
+  deferred.addErrback(error);
+
+  return {id_: id, deferred_: deferred};
+};
+
+
+/**
+ * Cancels a given request. The request must be exactly the object returned by
+ * the send method.
+ *
+ * @param {Object} request The request object returned by the send method.
+ */
+goog.net.Jsonp.prototype.cancel = function(request) {
+  if (request) {
+    if (request.deferred_) {
+      request.deferred_.cancel();
+    }
+    if (request.id_) {
+      goog.net.Jsonp.cleanup_(request.id_, false);
+    }
+  }
+};
+
+
+/**
+ * Creates a timeout callback that calls the given timeoutCallback with the
+ * original payload.
+ *
+ * @param {string} id The id of the script node.
+ * @param {Object} payload The payload that was sent to the server.
+ * @param {Function=} opt_errorCallback The function called on timeout.
+ * @return {!Function} A zero argument function that handles callback duties.
+ * @private
+ */
+goog.net.Jsonp.newErrorHandler_ = function(id,
+                                           payload,
+                                           opt_errorCallback) {
+  /**
+   * When we call across domains with a request, this function is the
+   * timeout handler. Once it's done executing the user-specified
+   * error-handler, it removes the script node and original function.
+   */
+  return function() {
+    goog.net.Jsonp.cleanup_(id, false);
+    if (opt_errorCallback) {
+      opt_errorCallback(payload);
+    }
+  };
+};
+
+
+/**
+ * Creates a reply callback that calls the given replyCallback with data
+ * returned by the server.
+ *
+ * @param {string} id The id of the script node.
+ * @param {Function} replyCallback The function called on reply.
+ * @return {!Function} A reply callback function.
+ * @private
+ */
+goog.net.Jsonp.newReplyHandler_ = function(id, replyCallback) {
+  /**
+   * This function is the handler for the all-is-well response. It
+   * clears the error timeout handler, calls the user's handler, then
+   * removes the script node and itself.
+   *
+   * @param {...Object} var_args The response data sent from the server.
+   */
+  var handler = function(var_args) {
+    goog.net.Jsonp.cleanup_(id, true);
+    replyCallback.apply(undefined, arguments);
+  };
+  return handler;
+};
+
+
+/**
+ * Removes the script node and reply handler with the given id.
+ *
+ * @param {string} id The id of the script node to be removed.
+ * @param {boolean} deleteReplyHandler If true, delete the reply handler
+ *     instead of setting it to nullFunction (if we know the callback could
+ *     never be called again).
+ * @private
+ */
+goog.net.Jsonp.cleanup_ = function(id, deleteReplyHandler) {
+  if (goog.global[goog.net.Jsonp.CALLBACKS][id]) {
+    if (deleteReplyHandler) {
+      delete goog.global[goog.net.Jsonp.CALLBACKS][id];
+    } else {
+      // Removing the script tag doesn't necessarily prevent the script
+      // from firing, so we make the callback a noop.
+      goog.global[goog.net.Jsonp.CALLBACKS][id] = goog.nullFunction;
+    }
+  }
+};
+
+
+/**
+ * Returns URL encoded payload. The payload should be a map of name-value
+ * pairs, in the form {"foo": 1, "bar": true, ...}.  If the map is empty,
+ * the URI will be unchanged.
+ *
+ * <p>The method uses hasOwnProperty() to assure the properties are on the
+ * object, not on its prototype.
+ *
+ * @param {!Object} payload A map of value name pairs to be encoded.
+ *     A value may be specified as an array, in which case a query parameter
+ *     will be created for each value, e.g.:
+ *     {"foo": [1,2]} will encode to "foo=1&foo=2".
+ *
+ * @param {!goog.Uri} uri A Uri object onto which the payload key value pairs
+ *     will be encoded.
+ *
+ * @return {!goog.Uri} A reference to the Uri sent as a parameter.
+ * @private
+ */
+goog.net.Jsonp.addPayloadToUri_ = function(payload, uri) {
+  for (var name in payload) {
+    // NOTE(user): Safari/1.3 doesn't have hasOwnProperty(). In that
+    // case, we iterate over all properties as a very lame workaround.
+    if (!payload.hasOwnProperty || payload.hasOwnProperty(name)) {
+      uri.setParameterValues(name, payload[name]);
+    }
+  }
+  return uri;
+};
+
+
+// WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
+//
+// This class allows us (Google) to send data from non-Google and thus
+// UNTRUSTED pages to our servers. Under NO CIRCUMSTANCES return
+// anything sensitive, such as session or cookie specific data. Return
+// only data that you want parties external to Google to have. Also
+// NEVER use this method to send data from web pages to untrusted
+// servers, or redirects to unknown servers (www.google.com/cache,
+// /q=xx&btnl, /url, www.googlepages.com, etc.)
+//
+// WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
+
+goog.provide('ol.source.TileImage');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('goog.object');
+goog.require('ol.ImageTile');
+goog.require('ol.TileCache');
+goog.require('ol.TileState');
+goog.require('ol.proj');
+goog.require('ol.reproj.Tile');
+goog.require('ol.source.UrlTile');
+
+
+
+/**
+ * @classdesc
+ * Base class for sources providing images divided into a tile grid.
+ *
+ * @constructor
+ * @fires ol.source.TileEvent
+ * @extends {ol.source.UrlTile}
+ * @param {olx.source.TileImageOptions} options Image tile options.
+ * @api
+ */
+ol.source.TileImage = function(options) {
+
+  goog.base(this, {
+    attributions: options.attributions,
+    extent: options.extent,
+    logo: options.logo,
+    opaque: options.opaque,
+    projection: options.projection,
+    state: options.state !== undefined ?
+        /** @type {ol.source.State} */ (options.state) : undefined,
+    tileGrid: options.tileGrid,
+    tileLoadFunction: options.tileLoadFunction ?
+        options.tileLoadFunction : ol.source.TileImage.defaultTileLoadFunction,
+    tilePixelRatio: options.tilePixelRatio,
+    tileUrlFunction: options.tileUrlFunction,
+    url: options.url,
+    urls: options.urls,
+    wrapX: options.wrapX
+  });
+
+  /**
+   * @protected
+   * @type {?string}
+   */
+  this.crossOrigin =
+      options.crossOrigin !== undefined ? options.crossOrigin : null;
+
+  /**
+   * @protected
+   * @type {function(new: ol.ImageTile, ol.TileCoord, ol.TileState, string,
+   *        ?string, ol.TileLoadFunctionType)}
+   */
+  this.tileClass = options.tileClass !== undefined ?
+      options.tileClass : ol.ImageTile;
+
+  /**
+   * @protected
+   * @type {Object.<string, ol.TileCache>}
+   */
+  this.tileCacheForProjection = {};
+
+  /**
+   * @protected
+   * @type {Object.<string, ol.tilegrid.TileGrid>}
+   */
+  this.tileGridForProjection = {};
+
+  /**
+   * @private
+   * @type {number|undefined}
+   */
+  this.reprojectionErrorThreshold_ = options.reprojectionErrorThreshold;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.renderReprojectionEdges_ = false;
+};
+goog.inherits(ol.source.TileImage, ol.source.UrlTile);
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileImage.prototype.canExpireCache = function() {
+  if (!ol.ENABLE_RASTER_REPROJECTION) {
+    return goog.base(this, 'canExpireCache');
+  }
+  var canExpire = this.tileCache.canExpireCache();
+  if (canExpire) {
+    return true;
+  } else {
+    return goog.object.some(this.tileCacheForProjection, function(tileCache) {
+      return tileCache.canExpireCache();
+    });
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileImage.prototype.expireCache = function(projection, usedTiles) {
+  if (!ol.ENABLE_RASTER_REPROJECTION) {
+    goog.base(this, 'expireCache', projection, usedTiles);
+    return;
+  }
+  var usedTileCache = this.getTileCacheForProjection(projection);
+
+  this.tileCache.expireCache(this.tileCache == usedTileCache ? usedTiles : {});
+  goog.object.forEach(this.tileCacheForProjection, function(tileCache) {
+    tileCache.expireCache(tileCache == usedTileCache ? usedTiles : {});
+  });
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileImage.prototype.getTileGridForProjection = function(projection) {
+  if (!ol.ENABLE_RASTER_REPROJECTION) {
+    return goog.base(this, 'getTileGridForProjection', projection);
+  }
+  var thisProj = this.getProjection();
+  if (this.tileGrid &&
+      (!thisProj || ol.proj.equivalent(thisProj, projection))) {
+    return this.tileGrid;
+  } else {
+    var projKey = goog.getUid(projection).toString();
+    if (!(projKey in this.tileGridForProjection)) {
+      this.tileGridForProjection[projKey] =
+          ol.tilegrid.getForProjection(projection);
+    }
+    return this.tileGridForProjection[projKey];
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileImage.prototype.getTileCacheForProjection = function(projection) {
+  if (!ol.ENABLE_RASTER_REPROJECTION) {
+    return goog.base(this, 'getTileCacheForProjection', projection);
+  }
+  var thisProj = this.getProjection();
+  if (!thisProj || ol.proj.equivalent(thisProj, projection)) {
+    return this.tileCache;
+  } else {
+    var projKey = goog.getUid(projection).toString();
+    if (!(projKey in this.tileCacheForProjection)) {
+      this.tileCacheForProjection[projKey] = new ol.TileCache();
+    }
+    return this.tileCacheForProjection[projKey];
+  }
+};
+
+
+/**
+ * @param {number} z Tile coordinate z.
+ * @param {number} x Tile coordinate x.
+ * @param {number} y Tile coordinate y.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.proj.Projection} projection Projection.
+ * @param {string} key The key set on the tile.
+ * @return {ol.Tile} Tile.
+ * @private
+ */
+ol.source.TileImage.prototype.createTile_ =
+    function(z, x, y, pixelRatio, projection, key) {
+  var tileCoord = [z, x, y];
+  var urlTileCoord = this.getTileCoordForTileUrlFunction(
+      tileCoord, projection);
+  var tileUrl = urlTileCoord ?
+      this.tileUrlFunction(urlTileCoord, pixelRatio, projection) : undefined;
+  var tile = new this.tileClass(
+      tileCoord,
+      tileUrl !== undefined ? ol.TileState.IDLE : ol.TileState.EMPTY,
+      tileUrl !== undefined ? tileUrl : '',
+      this.crossOrigin,
+      this.tileLoadFunction);
+  tile.key = key;
+  goog.events.listen(tile, goog.events.EventType.CHANGE,
+      this.handleTileChange, false, this);
+  return tile;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileImage.prototype.getTile =
+    function(z, x, y, pixelRatio, projection) {
+  if (!ol.ENABLE_RASTER_REPROJECTION ||
+      !this.getProjection() ||
+      !projection ||
+      ol.proj.equivalent(this.getProjection(), projection)) {
+    return this.getTileInternal(z, x, y, pixelRatio, projection);
+  } else {
+    var cache = this.getTileCacheForProjection(projection);
+    var tileCoord = [z, x, y];
+    var tileCoordKey = this.getKeyZXY.apply(this, tileCoord);
+    if (cache.containsKey(tileCoordKey)) {
+      return /** @type {!ol.Tile} */ (cache.get(tileCoordKey));
+    } else {
+      var sourceProjection = this.getProjection();
+      var sourceTileGrid = this.getTileGridForProjection(sourceProjection);
+      var targetTileGrid = this.getTileGridForProjection(projection);
+      var wrappedTileCoord =
+          this.getTileCoordForTileUrlFunction(tileCoord, projection);
+      var tile = new ol.reproj.Tile(
+          sourceProjection, sourceTileGrid,
+          projection, targetTileGrid,
+          tileCoord, wrappedTileCoord, this.getTilePixelRatio(),
+          goog.bind(function(z, x, y, pixelRatio) {
+            return this.getTileInternal(z, x, y, pixelRatio, sourceProjection);
+          }, this), this.reprojectionErrorThreshold_,
+          this.renderReprojectionEdges_);
+
+      cache.set(tileCoordKey, tile);
+      return tile;
+    }
+  }
+};
+
+
+/**
+ * @param {number} z Tile coordinate z.
+ * @param {number} x Tile coordinate x.
+ * @param {number} y Tile coordinate y.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {!ol.Tile} Tile.
+ * @protected
+ */
+ol.source.TileImage.prototype.getTileInternal =
+    function(z, x, y, pixelRatio, projection) {
+  var /** @type {ol.Tile} */ tile = null;
+  var tileCoordKey = this.getKeyZXY(z, x, y);
+  var paramsKey = this.getKeyParams();
+  if (!this.tileCache.containsKey(tileCoordKey)) {
+    goog.asserts.assert(projection, 'argument projection is truthy');
+    tile = this.createTile_(z, x, y, pixelRatio, projection, paramsKey);
+    this.tileCache.set(tileCoordKey, tile);
+  } else {
+    tile = /** @type {!ol.Tile} */ (this.tileCache.get(tileCoordKey));
+    if (tile.key != paramsKey) {
+      // The source's params changed. If the tile has an interim tile and if we
+      // can use it then we use it. Otherwise we create a new tile.  In both
+      // cases we attempt to assign an interim tile to the new tile.
+      var /** @type {ol.Tile} */ interimTile = tile;
+      if (tile.interimTile && tile.interimTile.key == paramsKey) {
+        goog.asserts.assert(tile.interimTile.getState() == ol.TileState.LOADED);
+        goog.asserts.assert(tile.interimTile.interimTile === null);
+        tile = tile.interimTile;
+        if (interimTile.getState() == ol.TileState.LOADED) {
+          tile.interimTile = interimTile;
+        }
+      } else {
+        tile = this.createTile_(z, x, y, pixelRatio, projection, paramsKey);
+        if (interimTile.getState() == ol.TileState.LOADED) {
+          tile.interimTile = interimTile;
+        } else if (interimTile.interimTile &&
+            interimTile.interimTile.getState() == ol.TileState.LOADED) {
+          tile.interimTile = interimTile.interimTile;
+          interimTile.interimTile = null;
+        }
+      }
+      if (tile.interimTile) {
+        tile.interimTile.interimTile = null;
+      }
+      this.tileCache.replace(tileCoordKey, tile);
+    }
+  }
+  goog.asserts.assert(tile);
+  return tile;
+};
+
+
+/**
+ * Sets whether to render reprojection edges or not (usually for debugging).
+ * @param {boolean} render Render the edges.
+ * @api
+ */
+ol.source.TileImage.prototype.setRenderReprojectionEdges = function(render) {
+  if (!ol.ENABLE_RASTER_REPROJECTION ||
+      this.renderReprojectionEdges_ == render) {
+    return;
+  }
+  this.renderReprojectionEdges_ = render;
+  goog.object.forEach(this.tileCacheForProjection, function(tileCache) {
+    tileCache.clear();
+  });
+  this.changed();
+};
+
+
+/**
+ * Sets the tile grid to use when reprojecting the tiles to the given
+ * projection instead of the default tile grid for the projection.
+ *
+ * This can be useful when the default tile grid cannot be created
+ * (e.g. projection has no extent defined) or
+ * for optimization reasons (custom tile size, resolutions, ...).
+ *
+ * @param {ol.proj.ProjectionLike} projection Projection.
+ * @param {ol.tilegrid.TileGrid} tilegrid Tile grid to use for the projection.
+ * @api
+ */
+ol.source.TileImage.prototype.setTileGridForProjection =
+    function(projection, tilegrid) {
+  if (ol.ENABLE_RASTER_REPROJECTION) {
+    var proj = ol.proj.get(projection);
+    if (proj) {
+      var projKey = goog.getUid(proj).toString();
+      if (!(projKey in this.tileGridForProjection)) {
+        this.tileGridForProjection[projKey] = tilegrid;
+      }
+    }
+  }
+};
+
+
+/**
+ * @param {ol.ImageTile} imageTile Image tile.
+ * @param {string} src Source.
+ */
+ol.source.TileImage.defaultTileLoadFunction = function(imageTile, src) {
+  imageTile.getImage().src = src;
+};
+
+goog.provide('ol.source.BingMaps');
+
+goog.require('goog.Uri');
+goog.require('goog.asserts');
+goog.require('goog.net.Jsonp');
+goog.require('ol.Attribution');
+goog.require('ol.TileRange');
+goog.require('ol.TileUrlFunction');
+goog.require('ol.extent');
+goog.require('ol.proj');
+goog.require('ol.source.State');
+goog.require('ol.source.TileImage');
+goog.require('ol.tilecoord');
+
+
+
+/**
+ * @classdesc
+ * Layer source for Bing Maps tile data.
+ *
+ * @constructor
+ * @extends {ol.source.TileImage}
+ * @param {olx.source.BingMapsOptions} options Bing Maps options.
+ * @api stable
+ */
+ol.source.BingMaps = function(options) {
+
+  goog.base(this, {
+    crossOrigin: 'anonymous',
+    opaque: true,
+    projection: ol.proj.get('EPSG:3857'),
+    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
+    state: ol.source.State.LOADING,
+    tileLoadFunction: options.tileLoadFunction,
+    wrapX: options.wrapX !== undefined ? options.wrapX : true
+  });
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.culture_ = options.culture !== undefined ? options.culture : 'en-us';
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.maxZoom_ = options.maxZoom !== undefined ? options.maxZoom : -1;
+
+  var uri = new goog.Uri(
+      'https://dev.virtualearth.net/REST/v1/Imagery/Metadata/' +
+      options.imagerySet);
+
+  var jsonp = new goog.net.Jsonp(uri, 'jsonp');
+  jsonp.send({
+    'include': 'ImageryProviders',
+    'uriScheme': 'https',
+    'key': options.key
+  }, goog.bind(this.handleImageryMetadataResponse, this));
+
+};
+goog.inherits(ol.source.BingMaps, ol.source.TileImage);
+
+
+/**
+ * The attribution containing a link to the Microsoft® Bing™ Maps Platform APIs’
+ * Terms Of Use.
+ * @const
+ * @type {ol.Attribution}
+ * @api
+ */
+ol.source.BingMaps.TOS_ATTRIBUTION = new ol.Attribution({
+  html: '<a class="ol-attribution-bing-tos" ' +
+      'href="http://www.microsoft.com/maps/product/terms.html">' +
+      'Terms of Use</a>'
+});
+
+
+/**
+ * @param {BingMapsImageryMetadataResponse} response Response.
+ */
+ol.source.BingMaps.prototype.handleImageryMetadataResponse =
+    function(response) {
+
+  if (response.statusCode != 200 ||
+      response.statusDescription != 'OK' ||
+      response.authenticationResultCode != 'ValidCredentials' ||
+      response.resourceSets.length != 1 ||
+      response.resourceSets[0].resources.length != 1) {
+    this.setState(ol.source.State.ERROR);
+    return;
+  }
+
+  var brandLogoUri = response.brandLogoUri;
+  if (brandLogoUri.indexOf('https') == -1) {
+    brandLogoUri = brandLogoUri.replace('http', 'https');
+  }
+  //var copyright = response.copyright;  // FIXME do we need to display this?
+  var resource = response.resourceSets[0].resources[0];
+  goog.asserts.assert(resource.imageWidth == resource.imageHeight,
+      'resource has imageWidth equal to imageHeight, i.e. is square');
+  var maxZoom = this.maxZoom_ == -1 ? resource.zoomMax : this.maxZoom_;
+
+  var sourceProjection = this.getProjection();
+  var extent = ol.tilegrid.extentFromProjection(sourceProjection);
+  var tileSize = resource.imageWidth == resource.imageHeight ?
+      resource.imageWidth : [resource.imageWidth, resource.imageHeight];
+  var tileGrid = ol.tilegrid.createXYZ({
+    extent: extent,
+    minZoom: resource.zoomMin,
+    maxZoom: maxZoom,
+    tileSize: tileSize
+  });
+  this.tileGrid = tileGrid;
+
+  var culture = this.culture_;
+  this.tileUrlFunction = ol.TileUrlFunction.createFromTileUrlFunctions(
+      resource.imageUrlSubdomains.map(function(subdomain) {
+        var quadKeyTileCoord = [0, 0, 0];
+        var imageUrl = resource.imageUrl
+            .replace('{subdomain}', subdomain)
+            .replace('{culture}', culture);
+        return (
+            /**
+             * @param {ol.TileCoord} tileCoord Tile coordinate.
+             * @param {number} pixelRatio Pixel ratio.
+             * @param {ol.proj.Projection} projection Projection.
+             * @return {string|undefined} Tile URL.
+             */
+            function(tileCoord, pixelRatio, projection) {
+              goog.asserts.assert(ol.proj.equivalent(
+                  projection, sourceProjection),
+                  'projections are equivalent');
+              if (!tileCoord) {
+                return undefined;
+              } else {
+                ol.tilecoord.createOrUpdate(tileCoord[0], tileCoord[1],
+                    -tileCoord[2] - 1, quadKeyTileCoord);
+                return imageUrl.replace('{quadkey}', ol.tilecoord.quadKey(
+                    quadKeyTileCoord));
+              }
+            });
+      }));
+
+  if (resource.imageryProviders) {
+    var transform = ol.proj.getTransformFromProjections(
+        ol.proj.get('EPSG:4326'), this.getProjection());
+
+    var attributions = resource.imageryProviders.map(function(imageryProvider) {
+      var html = imageryProvider.attribution;
+      /** @type {Object.<string, Array.<ol.TileRange>>} */
+      var tileRanges = {};
+      imageryProvider.coverageAreas.forEach(function(coverageArea) {
+        var minZ = coverageArea.zoomMin;
+        var maxZ = Math.min(coverageArea.zoomMax, maxZoom);
+        var bbox = coverageArea.bbox;
+        var epsg4326Extent = [bbox[1], bbox[0], bbox[3], bbox[2]];
+        var extent = ol.extent.applyTransform(epsg4326Extent, transform);
+        var tileRange, z, zKey;
+        for (z = minZ; z <= maxZ; ++z) {
+          zKey = z.toString();
+          tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z);
+          if (zKey in tileRanges) {
+            tileRanges[zKey].push(tileRange);
+          } else {
+            tileRanges[zKey] = [tileRange];
+          }
+        }
+      });
+      return new ol.Attribution({html: html, tileRanges: tileRanges});
+    });
+    attributions.push(ol.source.BingMaps.TOS_ATTRIBUTION);
+    this.setAttributions(attributions);
+  }
+
+  this.setLogo(brandLogoUri);
+
+  this.setState(ol.source.State.READY);
+
+};
+
+// FIXME keep cluster cache by resolution ?
+// FIXME distance not respected because of the centroid
+
+goog.provide('ol.source.Cluster');
+
+goog.require('goog.asserts');
+goog.require('goog.events.EventType');
+goog.require('goog.object');
+goog.require('ol.Feature');
+goog.require('ol.coordinate');
+goog.require('ol.extent');
+goog.require('ol.geom.Point');
+goog.require('ol.source.Vector');
+
+
+
+/**
+ * @classdesc
+ * Layer source to cluster vector data.
+ *
+ * @constructor
+ * @param {olx.source.ClusterOptions} options
+ * @extends {ol.source.Vector}
+ * @api
+ */
+ol.source.Cluster = function(options) {
+  goog.base(this, {
+    attributions: options.attributions,
+    extent: options.extent,
+    logo: options.logo,
+    projection: options.projection,
+    wrapX: options.wrapX
+  });
+
+  /**
+   * @type {number|undefined}
+   * @private
+   */
+  this.resolution_ = undefined;
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.distance_ = options.distance !== undefined ? options.distance : 20;
+
+  /**
+   * @type {Array.<ol.Feature>}
+   * @private
+   */
+  this.features_ = [];
+
+  /**
+   * @type {ol.source.Vector}
+   * @private
+   */
+  this.source_ = options.source;
+
+  this.source_.on(goog.events.EventType.CHANGE,
+      ol.source.Cluster.prototype.onSourceChange_, this);
+};
+goog.inherits(ol.source.Cluster, ol.source.Vector);
+
+
+/**
+ * Get a reference to the wrapped source.
+ * @return {ol.source.Vector} Source.
+ * @api
+ */
+ol.source.Cluster.prototype.getSource = function() {
+  return this.source_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.Cluster.prototype.loadFeatures = function(extent, resolution,
+    projection) {
+  this.source_.loadFeatures(extent, resolution, projection);
+  if (resolution !== this.resolution_) {
+    this.clear();
+    this.resolution_ = resolution;
+    this.cluster_();
+    this.addFeatures(this.features_);
+  }
+};
+
+
+/**
+ * handle the source changing
+ * @private
+ */
+ol.source.Cluster.prototype.onSourceChange_ = function() {
+  this.clear();
+  this.cluster_();
+  this.addFeatures(this.features_);
+  this.changed();
+};
+
+
+/**
+ * @private
+ */
+ol.source.Cluster.prototype.cluster_ = function() {
+  if (this.resolution_ === undefined) {
+    return;
+  }
+  this.features_.length = 0;
+  var extent = ol.extent.createEmpty();
+  var mapDistance = this.distance_ * this.resolution_;
+  var features = this.source_.getFeatures();
+
+  /**
+   * @type {Object.<string, boolean>}
+   */
+  var clustered = {};
+
+  for (var i = 0, ii = features.length; i < ii; i++) {
+    var feature = features[i];
+    if (!(goog.getUid(feature).toString() in clustered)) {
+      var geometry = feature.getGeometry();
+      goog.asserts.assert(geometry instanceof ol.geom.Point,
+          'feature geometry is a ol.geom.Point instance');
+      var coordinates = geometry.getCoordinates();
+      ol.extent.createOrUpdateFromCoordinate(coordinates, extent);
+      ol.extent.buffer(extent, mapDistance, extent);
+
+      var neighbors = this.source_.getFeaturesInExtent(extent);
+      goog.asserts.assert(neighbors.length >= 1, 'at least one neighbor found');
+      neighbors = neighbors.filter(function(neighbor) {
+        var uid = goog.getUid(neighbor).toString();
+        if (!(uid in clustered)) {
+          clustered[uid] = true;
+          return true;
+        } else {
+          return false;
+        }
+      });
+      this.features_.push(this.createCluster_(neighbors));
+    }
+  }
+  goog.asserts.assert(
+      goog.object.getCount(clustered) == this.source_.getFeatures().length,
+      'number of clustered equals number of features in the source');
+};
+
+
+/**
+ * @param {Array.<ol.Feature>} features Features
+ * @return {ol.Feature}
+ * @private
+ */
+ol.source.Cluster.prototype.createCluster_ = function(features) {
+  var length = features.length;
+  var centroid = [0, 0];
+  for (var i = 0; i < length; i++) {
+    var geometry = features[i].getGeometry();
+    goog.asserts.assert(geometry instanceof ol.geom.Point,
+        'feature geometry is a ol.geom.Point instance');
+    var coordinates = geometry.getCoordinates();
+    ol.coordinate.add(centroid, coordinates);
+  }
+  ol.coordinate.scale(centroid, 1 / length);
+
+  var cluster = new ol.Feature(new ol.geom.Point(centroid));
+  cluster.set('features', features);
+  return cluster;
+};
+
+goog.provide('ol.source.ImageMapGuide');
+
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('goog.object');
+goog.require('goog.uri.utils');
+goog.require('ol.Image');
+goog.require('ol.ImageLoadFunctionType');
+goog.require('ol.extent');
+goog.require('ol.source.Image');
+
+
+
+/**
+ * @classdesc
+ * Source for images from Mapguide servers
+ *
+ * @constructor
+ * @fires ol.source.ImageEvent
+ * @extends {ol.source.Image}
+ * @param {olx.source.ImageMapGuideOptions} options Options.
+ * @api stable
+ */
+ol.source.ImageMapGuide = function(options) {
+
+  goog.base(this, {
+    projection: options.projection,
+    resolutions: options.resolutions
+  });
+
+  /**
+   * @private
+   * @type {?string}
+   */
+  this.crossOrigin_ =
+      options.crossOrigin !== undefined ? options.crossOrigin : null;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.displayDpi_ = options.displayDpi !== undefined ?
+      options.displayDpi : 96;
+
+  /**
+   * @private
+   * @type {Object}
+   */
+  this.params_ = options.params !== undefined ? options.params : {};
+
+  /**
+   * @private
+   * @type {string|undefined}
+   */
+  this.url_ = options.url;
+
+  /**
+   * @private
+   * @type {ol.ImageLoadFunctionType}
+   */
+  this.imageLoadFunction_ = options.imageLoadFunction !== undefined ?
+      options.imageLoadFunction : ol.source.Image.defaultImageLoadFunction;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.hidpi_ = options.hidpi !== undefined ? options.hidpi : true;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.metersPerUnit_ = options.metersPerUnit !== undefined ?
+      options.metersPerUnit : 1;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.ratio_ = options.ratio !== undefined ? options.ratio : 1;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.useOverlay_ = options.useOverlay !== undefined ?
+      options.useOverlay : false;
+
+  /**
+   * @private
+   * @type {ol.Image}
+   */
+  this.image_ = null;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.renderedRevision_ = 0;
+
+};
+goog.inherits(ol.source.ImageMapGuide, ol.source.Image);
+
+
+/**
+ * Get the user-provided params, i.e. those passed to the constructor through
+ * the "params" option, and possibly updated using the updateParams method.
+ * @return {Object} Params.
+ * @api stable
+ */
+ol.source.ImageMapGuide.prototype.getParams = function() {
+  return this.params_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.ImageMapGuide.prototype.getImageInternal =
+    function(extent, resolution, pixelRatio, projection) {
+  resolution = this.findNearestResolution(resolution);
+  pixelRatio = this.hidpi_ ? pixelRatio : 1;
+
+  var image = this.image_;
+  if (image &&
+      this.renderedRevision_ == this.getRevision() &&
+      image.getResolution() == resolution &&
+      image.getPixelRatio() == pixelRatio &&
+      ol.extent.containsExtent(image.getExtent(), extent)) {
+    return image;
+  }
+
+  if (this.ratio_ != 1) {
+    extent = extent.slice();
+    ol.extent.scaleFromCenter(extent, this.ratio_);
+  }
+  var width = ol.extent.getWidth(extent) / resolution;
+  var height = ol.extent.getHeight(extent) / resolution;
+  var size = [width * pixelRatio, height * pixelRatio];
+
+  if (this.url_ !== undefined) {
+    var imageUrl = this.getUrl(this.url_, this.params_, extent, size,
+        projection);
+    image = new ol.Image(extent, resolution, pixelRatio,
+        this.getAttributions(), imageUrl, this.crossOrigin_,
+        this.imageLoadFunction_);
+    goog.events.listen(image, goog.events.EventType.CHANGE,
+        this.handleImageChange, false, this);
+  } else {
+    image = null;
+  }
+  this.image_ = image;
+  this.renderedRevision_ = this.getRevision();
+
+  return image;
+};
+
+
+/**
+ * Return the image load function of the source.
+ * @return {ol.ImageLoadFunctionType} The image load function.
+ * @api
+ */
+ol.source.ImageMapGuide.prototype.getImageLoadFunction = function() {
+  return this.imageLoadFunction_;
+};
+
+
+/**
+ * @param {ol.Extent} extent The map extents.
+ * @param {ol.Size} size The viewport size.
+ * @param {number} metersPerUnit The meters-per-unit value.
+ * @param {number} dpi The display resolution.
+ * @return {number} The computed map scale.
+ */
+ol.source.ImageMapGuide.getScale = function(extent, size, metersPerUnit, dpi) {
+  var mcsW = ol.extent.getWidth(extent);
+  var mcsH = ol.extent.getHeight(extent);
+  var devW = size[0];
+  var devH = size[1];
+  var mpp = 0.0254 / dpi;
+  if (devH * mcsW > devW * mcsH) {
+    return mcsW * metersPerUnit / (devW * mpp); // width limited
+  } else {
+    return mcsH * metersPerUnit / (devH * mpp); // height limited
+  }
+};
+
+
+/**
+ * Update the user-provided params.
+ * @param {Object} params Params.
+ * @api stable
+ */
+ol.source.ImageMapGuide.prototype.updateParams = function(params) {
+  goog.object.extend(this.params_, params);
+  this.changed();
+};
+
+
+/**
+ * @param {string} baseUrl The mapagent url.
+ * @param {Object.<string, string|number>} params Request parameters.
+ * @param {ol.Extent} extent Extent.
+ * @param {ol.Size} size Size.
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {string} The mapagent map image request URL.
+ */
+ol.source.ImageMapGuide.prototype.getUrl =
+    function(baseUrl, params, extent, size, projection) {
+  var scale = ol.source.ImageMapGuide.getScale(extent, size,
+      this.metersPerUnit_, this.displayDpi_);
+  var center = ol.extent.getCenter(extent);
+  var baseParams = {
+    'OPERATION': this.useOverlay_ ? 'GETDYNAMICMAPOVERLAYIMAGE' : 'GETMAPIMAGE',
+    'VERSION': '2.0.0',
+    'LOCALE': 'en',
+    'CLIENTAGENT': 'ol.source.ImageMapGuide source',
+    'CLIP': '1',
+    'SETDISPLAYDPI': this.displayDpi_,
+    'SETDISPLAYWIDTH': Math.round(size[0]),
+    'SETDISPLAYHEIGHT': Math.round(size[1]),
+    'SETVIEWSCALE': scale,
+    'SETVIEWCENTERX': center[0],
+    'SETVIEWCENTERY': center[1]
+  };
+  goog.object.extend(baseParams, params);
+  return goog.uri.utils.appendParamsFromMap(baseUrl, baseParams);
+};
+
+
+/**
+ * Set the image load function of the MapGuide source.
+ * @param {ol.ImageLoadFunctionType} imageLoadFunction Image load function.
+ * @api
+ */
+ol.source.ImageMapGuide.prototype.setImageLoadFunction = function(
+    imageLoadFunction) {
+  this.image_ = null;
+  this.imageLoadFunction_ = imageLoadFunction;
+  this.changed();
+};
+
+goog.provide('ol.source.ImageStatic');
+
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('ol.Image');
+goog.require('ol.ImageLoadFunctionType');
+goog.require('ol.ImageState');
+goog.require('ol.extent');
+goog.require('ol.proj');
+goog.require('ol.source.Image');
+
+
+
+/**
+ * @classdesc
+ * A layer source for displaying a single, static image.
+ *
+ * @constructor
+ * @extends {ol.source.Image}
+ * @param {olx.source.ImageStaticOptions} options Options.
+ * @api stable
+ */
+ol.source.ImageStatic = function(options) {
+
+  var attributions = options.attributions !== undefined ?
+      options.attributions : null;
+
+  var imageExtent = options.imageExtent;
+
+  var crossOrigin = options.crossOrigin !== undefined ?
+      options.crossOrigin : null;
+
+  var /** @type {ol.ImageLoadFunctionType} */ imageLoadFunction =
+      options.imageLoadFunction !== undefined ?
+      options.imageLoadFunction : ol.source.Image.defaultImageLoadFunction;
+
+  goog.base(this, {
+    attributions: attributions,
+    logo: options.logo,
+    projection: ol.proj.get(options.projection)
+  });
+
+  /**
+   * @private
+   * @type {ol.Image}
+   */
+  this.image_ = new ol.Image(imageExtent, undefined, 1, attributions,
+      options.url, crossOrigin, imageLoadFunction);
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.imageSize_ = options.imageSize ? options.imageSize : null;
+
+  goog.events.listen(this.image_, goog.events.EventType.CHANGE,
+      this.handleImageChange, false, this);
+
+};
+goog.inherits(ol.source.ImageStatic, ol.source.Image);
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.ImageStatic.prototype.getImageInternal =
+    function(extent, resolution, pixelRatio, projection) {
+  if (ol.extent.intersects(extent, this.image_.getExtent())) {
+    return this.image_;
+  }
+  return null;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.ImageStatic.prototype.handleImageChange = function(evt) {
+  if (this.image_.getState() == ol.ImageState.LOADED) {
+    var imageExtent = this.image_.getExtent();
+    var image = this.image_.getImage();
+    var imageWidth, imageHeight;
+    if (this.imageSize_) {
+      imageWidth = this.imageSize_[0];
+      imageHeight = this.imageSize_[1];
+    } else {
+      imageWidth = image.width;
+      imageHeight = image.height;
+    }
+    var resolution = ol.extent.getHeight(imageExtent) / imageHeight;
+    var targetWidth = Math.ceil(ol.extent.getWidth(imageExtent) / resolution);
+    if (targetWidth != imageWidth) {
+      var canvas = /** @type {HTMLCanvasElement} */
+          (document.createElement('canvas'));
+      canvas.width = targetWidth;
+      canvas.height = /** @type {number} */ (imageHeight);
+      var context = canvas.getContext('2d');
+      context.drawImage(image, 0, 0, imageWidth, imageHeight,
+          0, 0, canvas.width, canvas.height);
+      this.image_.setImage(canvas);
+    }
+  }
+  goog.base(this, 'handleImageChange', evt);
+};
+
+goog.provide('ol.source.wms');
+goog.provide('ol.source.wms.ServerType');
+
+
+/**
+ * Available server types: `'carmentaserver'`, `'geoserver'`, `'mapserver'`,
+ *     `'qgis'`. These are servers that have vendor parameters beyond the WMS
+ *     specification that OpenLayers can make use of.
+ * @enum {string}
+ * @api
+ */
+ol.source.wms.ServerType = {
+  CARMENTA_SERVER: 'carmentaserver',
+  GEOSERVER: 'geoserver',
+  MAPSERVER: 'mapserver',
+  QGIS: 'qgis'
+};
+
+// FIXME cannot be shared between maps with different projections
+
+goog.provide('ol.source.ImageWMS');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('goog.object');
+goog.require('goog.string');
+goog.require('goog.uri.utils');
+goog.require('ol');
+goog.require('ol.Image');
+goog.require('ol.ImageLoadFunctionType');
+goog.require('ol.extent');
+goog.require('ol.proj');
+goog.require('ol.source.Image');
+goog.require('ol.source.wms');
+goog.require('ol.source.wms.ServerType');
+
+
+
+/**
+ * @classdesc
+ * Source for WMS servers providing single, untiled images.
+ *
+ * @constructor
+ * @fires ol.source.ImageEvent
+ * @extends {ol.source.Image}
+ * @param {olx.source.ImageWMSOptions=} opt_options Options.
+ * @api stable
+ */
+ol.source.ImageWMS = function(opt_options) {
+
+  var options = opt_options || {};
+
+  goog.base(this, {
+    attributions: options.attributions,
+    logo: options.logo,
+    projection: options.projection,
+    resolutions: options.resolutions
+  });
+
+  /**
+   * @private
+   * @type {?string}
+   */
+  this.crossOrigin_ =
+      options.crossOrigin !== undefined ? options.crossOrigin : null;
+
+  /**
+   * @private
+   * @type {string|undefined}
+   */
+  this.url_ = options.url;
+
+  /**
+   * @private
+   * @type {ol.ImageLoadFunctionType}
+   */
+  this.imageLoadFunction_ = options.imageLoadFunction !== undefined ?
+      options.imageLoadFunction : ol.source.Image.defaultImageLoadFunction;
+
+  /**
+   * @private
+   * @type {Object}
+   */
+  this.params_ = options.params;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.v13_ = true;
+  this.updateV13_();
+
+  /**
+   * @private
+   * @type {ol.source.wms.ServerType|undefined}
+   */
+  this.serverType_ =
+      /** @type {ol.source.wms.ServerType|undefined} */ (options.serverType);
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.hidpi_ = options.hidpi !== undefined ? options.hidpi : true;
+
+  /**
+   * @private
+   * @type {ol.Image}
+   */
+  this.image_ = null;
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.imageSize_ = [0, 0];
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.renderedRevision_ = 0;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.ratio_ = options.ratio !== undefined ? options.ratio : 1.5;
+
+};
+goog.inherits(ol.source.ImageWMS, ol.source.Image);
+
+
+/**
+ * @const
+ * @type {ol.Size}
+ * @private
+ */
+ol.source.ImageWMS.GETFEATUREINFO_IMAGE_SIZE_ = [101, 101];
+
+
+/**
+ * Return the GetFeatureInfo URL for the passed coordinate, resolution, and
+ * projection. Return `undefined` if the GetFeatureInfo URL cannot be
+ * constructed.
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {number} resolution Resolution.
+ * @param {ol.proj.ProjectionLike} projection Projection.
+ * @param {!Object} params GetFeatureInfo params. `INFO_FORMAT` at least should
+ *     be provided. If `QUERY_LAYERS` is not provided then the layers specified
+ *     in the `LAYERS` parameter will be used. `VERSION` should not be
+ *     specified here.
+ * @return {string|undefined} GetFeatureInfo URL.
+ * @api stable
+ */
+ol.source.ImageWMS.prototype.getGetFeatureInfoUrl =
+    function(coordinate, resolution, projection, params) {
+
+  goog.asserts.assert(!('VERSION' in params),
+      'key VERSION is not allowed in params');
+
+  if (this.url_ === undefined) {
+    return undefined;
+  }
+
+  var extent = ol.extent.getForViewAndSize(
+      coordinate, resolution, 0,
+      ol.source.ImageWMS.GETFEATUREINFO_IMAGE_SIZE_);
+
+  var baseParams = {
+    'SERVICE': 'WMS',
+    'VERSION': ol.DEFAULT_WMS_VERSION,
+    'REQUEST': 'GetFeatureInfo',
+    'FORMAT': 'image/png',
+    'TRANSPARENT': true,
+    'QUERY_LAYERS': this.params_['LAYERS']
+  };
+  goog.object.extend(baseParams, this.params_, params);
+
+  var x = Math.floor((coordinate[0] - extent[0]) / resolution);
+  var y = Math.floor((extent[3] - coordinate[1]) / resolution);
+  baseParams[this.v13_ ? 'I' : 'X'] = x;
+  baseParams[this.v13_ ? 'J' : 'Y'] = y;
+
+  return this.getRequestUrl_(
+      extent, ol.source.ImageWMS.GETFEATUREINFO_IMAGE_SIZE_,
+      1, ol.proj.get(projection), baseParams);
+};
+
+
+/**
+ * Get the user-provided params, i.e. those passed to the constructor through
+ * the "params" option, and possibly updated using the updateParams method.
+ * @return {Object} Params.
+ * @api stable
+ */
+ol.source.ImageWMS.prototype.getParams = function() {
+  return this.params_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.ImageWMS.prototype.getImageInternal =
+    function(extent, resolution, pixelRatio, projection) {
+
+  if (this.url_ === undefined) {
+    return null;
+  }
+
+  resolution = this.findNearestResolution(resolution);
+
+  if (pixelRatio != 1 && (!this.hidpi_ || this.serverType_ === undefined)) {
+    pixelRatio = 1;
+  }
+
+  extent = extent.slice();
+  var centerX = (extent[0] + extent[2]) / 2;
+  var centerY = (extent[1] + extent[3]) / 2;
+
+  var imageResolution = resolution / pixelRatio;
+  var imageWidth = ol.extent.getWidth(extent) / imageResolution;
+  var imageHeight = ol.extent.getHeight(extent) / imageResolution;
+
+  var image = this.image_;
+  if (image &&
+      this.renderedRevision_ == this.getRevision() &&
+      image.getResolution() == resolution &&
+      image.getPixelRatio() == pixelRatio &&
+      ol.extent.containsExtent(image.getExtent(), extent)) {
+    return image;
+  }
+
+  if (this.ratio_ != 1) {
+    var halfWidth = this.ratio_ * ol.extent.getWidth(extent) / 2;
+    var halfHeight = this.ratio_ * ol.extent.getHeight(extent) / 2;
+    extent[0] = centerX - halfWidth;
+    extent[1] = centerY - halfHeight;
+    extent[2] = centerX + halfWidth;
+    extent[3] = centerY + halfHeight;
+  }
+
+  var params = {
+    'SERVICE': 'WMS',
+    'VERSION': ol.DEFAULT_WMS_VERSION,
+    'REQUEST': 'GetMap',
+    'FORMAT': 'image/png',
+    'TRANSPARENT': true
+  };
+  goog.object.extend(params, this.params_);
+
+  this.imageSize_[0] = Math.ceil(imageWidth * this.ratio_);
+  this.imageSize_[1] = Math.ceil(imageHeight * this.ratio_);
+
+  var url = this.getRequestUrl_(extent, this.imageSize_, pixelRatio,
+      projection, params);
+
+  this.image_ = new ol.Image(extent, resolution, pixelRatio,
+      this.getAttributions(), url, this.crossOrigin_, this.imageLoadFunction_);
+
+  this.renderedRevision_ = this.getRevision();
+
+  goog.events.listen(this.image_, goog.events.EventType.CHANGE,
+      this.handleImageChange, false, this);
+
+  return this.image_;
+
+};
+
+
+/**
+ * Return the image load function of the source.
+ * @return {ol.ImageLoadFunctionType} The image load function.
+ * @api
+ */
+ol.source.ImageWMS.prototype.getImageLoadFunction = function() {
+  return this.imageLoadFunction_;
+};
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {ol.Size} size Size.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.proj.Projection} projection Projection.
+ * @param {Object} params Params.
+ * @return {string} Request URL.
+ * @private
+ */
+ol.source.ImageWMS.prototype.getRequestUrl_ =
+    function(extent, size, pixelRatio, projection, params) {
+
+  goog.asserts.assert(this.url_ !== undefined, 'url is defined');
+
+  params[this.v13_ ? 'CRS' : 'SRS'] = projection.getCode();
+
+  if (!('STYLES' in this.params_)) {
+    /* jshint -W053 */
+    params['STYLES'] = new String('');
+    /* jshint +W053 */
+  }
+
+  if (pixelRatio != 1) {
+    switch (this.serverType_) {
+      case ol.source.wms.ServerType.GEOSERVER:
+        var dpi = (90 * pixelRatio + 0.5) | 0;
+        if ('FORMAT_OPTIONS' in params) {
+          params['FORMAT_OPTIONS'] += ';dpi:' + dpi;
+        } else {
+          params['FORMAT_OPTIONS'] = 'dpi:' + dpi;
+        }
+        break;
+      case ol.source.wms.ServerType.MAPSERVER:
+        params['MAP_RESOLUTION'] = 90 * pixelRatio;
+        break;
+      case ol.source.wms.ServerType.CARMENTA_SERVER:
+      case ol.source.wms.ServerType.QGIS:
+        params['DPI'] = 90 * pixelRatio;
+        break;
+      default:
+        goog.asserts.fail('unknown serverType configured');
+        break;
+    }
+  }
+
+  params['WIDTH'] = size[0];
+  params['HEIGHT'] = size[1];
+
+  var axisOrientation = projection.getAxisOrientation();
+  var bbox;
+  if (this.v13_ && axisOrientation.substr(0, 2) == 'ne') {
+    bbox = [extent[1], extent[0], extent[3], extent[2]];
+  } else {
+    bbox = extent;
+  }
+  params['BBOX'] = bbox.join(',');
+
+  return goog.uri.utils.appendParamsFromMap(this.url_, params);
+};
+
+
+/**
+ * Return the URL used for this WMS source.
+ * @return {string|undefined} URL.
+ * @api stable
+ */
+ol.source.ImageWMS.prototype.getUrl = function() {
+  return this.url_;
+};
+
+
+/**
+ * Set the image load function of the source.
+ * @param {ol.ImageLoadFunctionType} imageLoadFunction Image load function.
+ * @api
+ */
+ol.source.ImageWMS.prototype.setImageLoadFunction = function(
+    imageLoadFunction) {
+  this.image_ = null;
+  this.imageLoadFunction_ = imageLoadFunction;
+  this.changed();
+};
+
+
+/**
+ * Set the URL to use for requests.
+ * @param {string|undefined} url URL.
+ * @api stable
+ */
+ol.source.ImageWMS.prototype.setUrl = function(url) {
+  if (url != this.url_) {
+    this.url_ = url;
+    this.image_ = null;
+    this.changed();
+  }
+};
+
+
+/**
+ * Update the user-provided params.
+ * @param {Object} params Params.
+ * @api stable
+ */
+ol.source.ImageWMS.prototype.updateParams = function(params) {
+  goog.object.extend(this.params_, params);
+  this.updateV13_();
+  this.image_ = null;
+  this.changed();
+};
+
+
+/**
+ * @private
+ */
+ol.source.ImageWMS.prototype.updateV13_ = function() {
+  var version =
+      goog.object.get(this.params_, 'VERSION', ol.DEFAULT_WMS_VERSION);
+  this.v13_ = goog.string.compareVersions(version, '1.3') >= 0;
+};
+
+goog.provide('ol.source.XYZ');
+
+goog.require('ol.source.TileImage');
+
+
+
+/**
+ * @classdesc
+ * Layer source for tile data with URLs in a set XYZ format that are
+ * defined in a URL template. By default, this follows the widely-used
+ * Google grid where `x` 0 and `y` 0 are in the top left. Grids like
+ * TMS where `x` 0 and `y` 0 are in the bottom left can be used by
+ * using the `{-y}` placeholder in the URL template, so long as the
+ * source does not have a custom tile grid. In this case,
+ * {@link ol.source.TileImage} can be used with a `tileUrlFunction`
+ * such as:
+ *
+ *  tileUrlFunction: function(coordinate) {
+ *    return 'http://mapserver.com/' + coordinate[0] + '/' +
+ *        coordinate[1] + '/' + coordinate[2] + '.png';
+ *    }
+ *
+ *
+ * @constructor
+ * @extends {ol.source.TileImage}
+ * @param {olx.source.XYZOptions} options XYZ options.
+ * @api stable
+ */
+ol.source.XYZ = function(options) {
+  var projection = options.projection !== undefined ?
+      options.projection : 'EPSG:3857';
+
+  var tileGrid = options.tileGrid !== undefined ? options.tileGrid :
+      ol.tilegrid.createXYZ({
+        extent: ol.tilegrid.extentFromProjection(projection),
+        maxZoom: options.maxZoom,
+        tileSize: options.tileSize
+      });
+
+  goog.base(this, {
+    attributions: options.attributions,
+    crossOrigin: options.crossOrigin,
+    logo: options.logo,
+    projection: projection,
+    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
+    tileGrid: tileGrid,
+    tileLoadFunction: options.tileLoadFunction,
+    tilePixelRatio: options.tilePixelRatio,
+    tileUrlFunction: options.tileUrlFunction,
+    url: options.url,
+    urls: options.urls,
+    wrapX: options.wrapX !== undefined ? options.wrapX : true
+  });
+
+};
+goog.inherits(ol.source.XYZ, ol.source.TileImage);
+
+goog.provide('ol.source.OSM');
+
+goog.require('ol.Attribution');
+goog.require('ol.source.XYZ');
+
+
+
+/**
+ * @classdesc
+ * Layer source for the OpenStreetMap tile server.
+ *
+ * @constructor
+ * @extends {ol.source.XYZ}
+ * @param {olx.source.OSMOptions=} opt_options Open Street Map options.
+ * @api stable
+ */
+ol.source.OSM = function(opt_options) {
+
+  var options = opt_options || {};
+
+  var attributions;
+  if (options.attributions !== undefined) {
+    attributions = options.attributions;
+  } else {
+    attributions = [ol.source.OSM.ATTRIBUTION];
+  }
+
+  var crossOrigin = options.crossOrigin !== undefined ?
+      options.crossOrigin : 'anonymous';
+
+  var url = options.url !== undefined ?
+      options.url : 'https://{a-c}.tile.openstreetmap.org/{z}/{x}/{y}.png';
+
+  goog.base(this, {
+    attributions: attributions,
+    crossOrigin: crossOrigin,
+    opaque: true,
+    maxZoom: options.maxZoom !== undefined ? options.maxZoom : 19,
+    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
+    tileLoadFunction: options.tileLoadFunction,
+    url: url,
+    wrapX: options.wrapX
+  });
+
+};
+goog.inherits(ol.source.OSM, ol.source.XYZ);
+
+
+/**
+ * The attribution containing a link to the OpenStreetMap Copyright and License
+ * page.
+ * @const
+ * @type {ol.Attribution}
+ * @api
+ */
+ol.source.OSM.ATTRIBUTION = new ol.Attribution({
+  html: '&copy; ' +
+      '<a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a> ' +
+      'contributors.'
+});
+
+goog.provide('ol.source.MapQuest');
+
+goog.require('goog.asserts');
+goog.require('ol.Attribution');
+goog.require('ol.source.OSM');
+goog.require('ol.source.XYZ');
+
+
+
+/**
+ * @classdesc
+ * Layer source for the MapQuest tile server.
+ *
+ * @constructor
+ * @extends {ol.source.XYZ}
+ * @param {olx.source.MapQuestOptions=} opt_options MapQuest options.
+ * @api stable
+ */
+ol.source.MapQuest = function(opt_options) {
+
+  var options = opt_options || {};
+  goog.asserts.assert(options.layer in ol.source.MapQuestConfig,
+      'known layer configured');
+
+  var layerConfig = ol.source.MapQuestConfig[options.layer];
+
+  /**
+   * Layer. Possible values are `osm`, `sat`, and `hyb`.
+   * @type {string}
+   * @private
+   */
+  this.layer_ = options.layer;
+
+  var url = options.url !== undefined ? options.url :
+      'https://otile{1-4}-s.mqcdn.com/tiles/1.0.0/' +
+      this.layer_ + '/{z}/{x}/{y}.jpg';
+
+  goog.base(this, {
+    attributions: layerConfig.attributions,
+    crossOrigin: 'anonymous',
+    logo: 'https://developer.mapquest.com/content/osm/mq_logo.png',
+    maxZoom: layerConfig.maxZoom,
+    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
+    opaque: true,
+    tileLoadFunction: options.tileLoadFunction,
+    url: url
+  });
+
+};
+goog.inherits(ol.source.MapQuest, ol.source.XYZ);
+
+
+/**
+ * @const
+ * @type {ol.Attribution}
+ */
+ol.source.MapQuest.TILE_ATTRIBUTION = new ol.Attribution({
+  html: 'Tiles Courtesy of <a href="http://www.mapquest.com/">MapQuest</a>'
+});
+
+
+/**
+ * @type {Object.<string, {maxZoom: number, attributions: (Array.<ol.Attribution>)}>}
+ */
+ol.source.MapQuestConfig = {
+  'osm': {
+    maxZoom: 19,
+    attributions: [
+      ol.source.MapQuest.TILE_ATTRIBUTION,
+      ol.source.OSM.ATTRIBUTION
+    ]
+  },
+  'sat': {
+    maxZoom: 18,
+    attributions: [
+      ol.source.MapQuest.TILE_ATTRIBUTION,
+      new ol.Attribution({
+        html: 'Portions Courtesy NASA/JPL-Caltech and ' +
+            'U.S. Depart. of Agriculture, Farm Service Agency'
+      })
+    ]
+  },
+  'hyb': {
+    maxZoom: 18,
+    attributions: [
+      ol.source.MapQuest.TILE_ATTRIBUTION,
+      ol.source.OSM.ATTRIBUTION
+    ]
+  }
+};
+
+
+/**
+ * Get the layer of the source, either `osm`, `sat`, or `hyb`.
+ * @return {string} Layer.
+ * @api
+ */
+ol.source.MapQuest.prototype.getLayer = function() {
+  return this.layer_;
+};
+
+goog.provide('ol.ext.pixelworks');
+/** @typedef {function(*)} */
+ol.ext.pixelworks;
+(function() {
+var exports = {};
+var module = {exports: exports};
+var define;
+/**
+ * @fileoverview
+ * @suppress {accessControls, ambiguousFunctionDecl, checkDebuggerStatement, checkRegExp, checkTypes, checkVars, const, constantProperty, deprecated, duplicate, es5Strict, fileoverviewTags, missingProperties, nonStandardJsDocs, strictModuleDepCheck, suspiciousCode, undefinedNames, undefinedVars, unknownDefines, uselessCode, visibility}
+ */
+(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.pixelworks = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
+var Processor = _dereq_('./processor');
+
+exports.Processor = Processor;
+
+},{"./processor":2}],2:[function(_dereq_,module,exports){
+/* eslint-disable dot-notation */
+
+/**
+ * Create a function for running operations.
+ * @param {function(Array, Object):*} operation The operation.
+ * @return {function(Object):ArrayBuffer} A function that takes an object with
+ * buffers, meta, imageOps, width, and height properties and returns an array
+ * buffer.
+ */
+function createMinion(operation) {
+  return function(data) {
+    // bracket notation for minification support
+    var buffers = data['buffers'];
+    var meta = data['meta'];
+    var imageOps = data['imageOps'];
+    var width = data['width'];
+    var height = data['height'];
+
+    var numBuffers = buffers.length;
+    var numBytes = buffers[0].byteLength;
+    var output, b;
+
+    if (imageOps) {
+      var images = new Array(numBuffers);
+      for (b = 0; b < numBuffers; ++b) {
+        images[b] = new ImageData(
+            new Uint8ClampedArray(buffers[b]), width, height);
+      }
+      output = operation(images, meta).data;
+    } else {
+      output = new Uint8ClampedArray(numBytes);
+      var arrays = new Array(numBuffers);
+      var pixels = new Array(numBuffers);
+      for (b = 0; b < numBuffers; ++b) {
+        arrays[b] = new Uint8ClampedArray(buffers[b]);
+        pixels[b] = [0, 0, 0, 0];
+      }
+      for (var i = 0; i < numBytes; i += 4) {
+        for (var j = 0; j < numBuffers; ++j) {
+          var array = arrays[j];
+          pixels[j][0] = array[i];
+          pixels[j][1] = array[i + 1];
+          pixels[j][2] = array[i + 2];
+          pixels[j][3] = array[i + 3];
+        }
+        var pixel = operation(pixels, meta);
+        output[i] = pixel[0];
+        output[i + 1] = pixel[1];
+        output[i + 2] = pixel[2];
+        output[i + 3] = pixel[3];
+      }
+    }
+    return output.buffer;
+  };
+}
+
+/**
+ * Create a worker for running operations.
+ * @param {Object} config Configuration.
+ * @param {function(Object)} onMessage Called with a message event.
+ * @return {Worker} The worker.
+ */
+function createWorker(config, onMessage) {
+  var lib = Object.keys(config.lib || {}).map(function(name) {
+    return 'var ' + name + ' = ' + config.lib[name].toString() + ';';
+  });
+
+  var lines = lib.concat([
+    'var __minion__ = (' + createMinion.toString() + ')(',
+        config.operation.toString(),
+    ');',
+    'self.addEventListener("message", function(__event__) {',
+      'var buffer = __minion__(__event__.data);',
+      'self.postMessage({buffer: buffer, meta: __event__.data.meta}, [buffer]);',
+    '});'
+  ]);
+
+  var blob = new Blob(lines, {type: 'text/javascript'});
+  var source = URL.createObjectURL(blob);
+  var worker = new Worker(source);
+  worker.addEventListener('message', onMessage);
+  return worker;
+}
+
+/**
+ * Create a faux worker for running operations.
+ * @param {Object} config Configuration.
+ * @param {function(Object)} onMessage Called with a message event.
+ * @return {Object} The faux worker.
+ */
+function createFauxWorker(config, onMessage) {
+  var minion = createMinion(config.operation);
+  return {
+    postMessage: function(data) {
+      setTimeout(function() {
+        onMessage({data: {buffer: minion(data), meta: data.meta}});
+      }, 0);
+    }
+  };
+}
+
+/**
+ * A processor runs pixel or image operations in workers.
+ * @param {Object} config Configuration.
+ */
+function Processor(config) {
+  this._imageOps = !!config.imageOps;
+  var threads;
+  if (config.threads === 0) {
+    threads = 0;
+  } else if (this._imageOps) {
+    threads = 1;
+  } else {
+    threads = config.threads || 1;
+  }
+  var workers = [];
+  if (threads) {
+    for (var i = 0; i < threads; ++i) {
+      workers[i] = createWorker(config, this._onWorkerMessage.bind(this, i));
+    }
+  } else {
+    workers[0] = createFauxWorker(config, this._onWorkerMessage.bind(this, 0));
+  }
+  this._workers = workers;
+  this._queue = [];
+  this._maxQueueLength = config.queue || Infinity;
+  this._running = 0;
+  this._dataLookup = {};
+  this._job = null;
+}
+
+/**
+ * Run operation on input data.
+ * @param {Array.<Array|ImageData>} inputs Array of pixels or image data
+ *     (depending on the operation type).
+ * @param {Object} meta A user data object.  This is passed to all operations
+ *     and must be serializable.
+ * @param {function(Error, ImageData, Object)} callback Called when work
+ *     completes.  The first argument is any error.  The second is the ImageData
+ *     generated by operations.  The third is the user data object.
+ */
+Processor.prototype.process = function(inputs, meta, callback) {
+  this._enqueue({
+    inputs: inputs,
+    meta: meta,
+    callback: callback
+  });
+  this._dispatch();
+};
+
+/**
+ * Stop responding to any completed work and destroy the processor.
+ */
+Processor.prototype.destroy = function() {
+  for (var key in this) {
+    this[key] = null;
+  }
+  this._destroyed = true;
+};
+
+/**
+ * Add a job to the queue.
+ * @param {Object} job The job.
+ */
+Processor.prototype._enqueue = function(job) {
+  this._queue.push(job);
+  while (this._queue.length > this._maxQueueLength) {
+    this._queue.shift().callback(null, null);
+  }
+};
+
+/**
+ * Dispatch a job.
+ */
+Processor.prototype._dispatch = function() {
+  if (this._running === 0 && this._queue.length > 0) {
+    var job = this._job = this._queue.shift();
+    var width = job.inputs[0].width;
+    var height = job.inputs[0].height;
+    var buffers = job.inputs.map(function(input) {
+      return input.data.buffer;
+    });
+    var threads = this._workers.length;
+    this._running = threads;
+    if (threads === 1) {
+      this._workers[0].postMessage({
+        'buffers': buffers,
+        'meta': job.meta,
+        'imageOps': this._imageOps,
+        'width': width,
+        'height': height
+      }, buffers);
+    } else {
+      var length = job.inputs[0].data.length;
+      var segmentLength = 4 * Math.ceil(length / 4 / threads);
+      for (var i = 0; i < threads; ++i) {
+        var offset = i * segmentLength;
+        var slices = [];
+        for (var j = 0, jj = buffers.length; j < jj; ++j) {
+          slices.push(buffers[i].slice(offset, offset + segmentLength));
+        }
+        this._workers[i].postMessage({
+          'buffers': slices,
+          'meta': job.meta,
+          'imageOps': this._imageOps,
+          'width': width,
+          'height': height
+        }, slices);
+      }
+    }
+  }
+};
+
+/**
+ * Handle messages from the worker.
+ * @param {number} index The worker index.
+ * @param {Object} event The message event.
+ */
+Processor.prototype._onWorkerMessage = function(index, event) {
+  if (this._destroyed) {
+    return;
+  }
+  this._dataLookup[index] = event.data;
+  --this._running;
+  if (this._running === 0) {
+    this._resolveJob();
+  }
+};
+
+/**
+ * Resolve a job.  If there are no more worker threads, the processor callback
+ * will be called.
+ */
+Processor.prototype._resolveJob = function() {
+  var job = this._job;
+  var threads = this._workers.length;
+  var data, meta;
+  if (threads === 1) {
+    data = new Uint8ClampedArray(this._dataLookup[0]['buffer']);
+    meta = this._dataLookup[0]['meta'];
+  } else {
+    var length = job.inputs[0].data.length;
+    data = new Uint8ClampedArray(length);
+    meta = new Array(length);
+    var segmentLength = 4 * Math.ceil(length / 4 / threads);
+    for (var i = 0; i < threads; ++i) {
+      var buffer = this._dataLookup[i]['buffer'];
+      var offset = i * segmentLength;
+      data.set(new Uint8ClampedArray(buffer), offset);
+      meta[i] = this._dataLookup[i]['meta'];
+    }
+  }
+  this._job = null;
+  this._dataLookup = {};
+  job.callback(null,
+      new ImageData(data, job.inputs[0].width, job.inputs[0].height), meta);
+  this._dispatch();
+};
+
+module.exports = Processor;
+
+},{}]},{},[1])(1)
+});
+ol.ext.pixelworks = module.exports;
+})();
+
+goog.provide('ol.source.Raster');
+goog.provide('ol.source.RasterEvent');
+goog.provide('ol.source.RasterEventType');
+
+goog.require('goog.asserts');
+goog.require('goog.events');
+goog.require('goog.events.Event');
+goog.require('goog.events.EventType');
+goog.require('goog.object');
+goog.require('goog.vec.Mat4');
+goog.require('ol.ImageCanvas');
+goog.require('ol.TileQueue');
+goog.require('ol.dom');
+goog.require('ol.ext.pixelworks');
+goog.require('ol.extent');
+goog.require('ol.layer.Image');
+goog.require('ol.layer.Tile');
+goog.require('ol.raster.OperationType');
+goog.require('ol.renderer.canvas.ImageLayer');
+goog.require('ol.renderer.canvas.TileLayer');
+goog.require('ol.source.Image');
+goog.require('ol.source.State');
+goog.require('ol.source.Tile');
+
+
+
+/**
+ * @classdesc
+ * A source that transforms data from any number of input sources using an array
+ * of {@link ol.raster.Operation} functions to transform input pixel values into
+ * output pixel values.
+ *
+ * @constructor
+ * @extends {ol.source.Image}
+ * @param {olx.source.RasterOptions} options Options.
+ * @api
+ */
+ol.source.Raster = function(options) {
+
+  /**
+   * @private
+   * @type {*}
+   */
+  this.worker_ = null;
+
+  /**
+   * @private
+   * @type {ol.raster.OperationType}
+   */
+  this.operationType_ = options.operationType !== undefined ?
+      options.operationType : ol.raster.OperationType.PIXEL;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.threads_ = options.threads !== undefined ? options.threads : 1;
+
+  /**
+   * @private
+   * @type {Array.<ol.renderer.canvas.Layer>}
+   */
+  this.renderers_ = ol.source.Raster.createRenderers_(options.sources);
+
+  for (var r = 0, rr = this.renderers_.length; r < rr; ++r) {
+    goog.events.listen(this.renderers_[r], goog.events.EventType.CHANGE,
+        this.changed, false, this);
+  }
+
+  /**
+   * @private
+   * @type {CanvasRenderingContext2D}
+   */
+  this.canvasContext_ = ol.dom.createCanvasContext2D();
+
+  /**
+   * @private
+   * @type {ol.TileQueue}
+   */
+  this.tileQueue_ = new ol.TileQueue(
+      function() { return 1; },
+      goog.bind(this.changed, this));
+
+  var layerStatesArray = ol.source.Raster.getLayerStatesArray_(this.renderers_);
+  var layerStates = {};
+  for (var i = 0, ii = layerStatesArray.length; i < ii; ++i) {
+    layerStates[goog.getUid(layerStatesArray[i].layer)] = layerStatesArray[i];
+  }
+
+  /**
+   * The most recently rendered state.
+   * @type {?ol.source.Raster.RenderedState}
+   * @private
+   */
+  this.renderedState_ = null;
+
+  /**
+   * The most recently rendered image canvas.
+   * @type {ol.ImageCanvas}
+   * @private
+   */
+  this.renderedImageCanvas_ = null;
+
+  /**
+   * @private
+   * @type {olx.FrameState}
+   */
+  this.frameState_ = {
+    animate: false,
+    attributions: {},
+    coordinateToPixelMatrix: goog.vec.Mat4.createNumber(),
+    extent: null,
+    focus: null,
+    index: 0,
+    layerStates: layerStates,
+    layerStatesArray: layerStatesArray,
+    logos: {},
+    pixelRatio: 1,
+    pixelToCoordinateMatrix: goog.vec.Mat4.createNumber(),
+    postRenderFunctions: [],
+    size: [0, 0],
+    skippedFeatureUids: {},
+    tileQueue: this.tileQueue_,
+    time: Date.now(),
+    usedTiles: {},
+    viewState: /** @type {olx.ViewState} */ ({
+      rotation: 0
+    }),
+    viewHints: [],
+    wantedTiles: {}
+  };
+
+  goog.base(this, {});
+
+  if (options.operation !== undefined) {
+    this.setOperation(options.operation, options.lib);
+  }
+
+};
+goog.inherits(ol.source.Raster, ol.source.Image);
+
+
+/**
+ * Set the operation.
+ * @param {ol.raster.Operation} operation New operation.
+ * @param {Object=} opt_lib Functions that will be available to operations run
+ *     in a worker.
+ * @api
+ */
+ol.source.Raster.prototype.setOperation = function(operation, opt_lib) {
+  this.worker_ = new ol.ext.pixelworks.Processor({
+    operation: operation,
+    imageOps: this.operationType_ === ol.raster.OperationType.IMAGE,
+    queue: 1,
+    lib: opt_lib,
+    threads: this.threads_
+  });
+  this.changed();
+};
+
+
+/**
+ * Update the stored frame state.
+ * @param {ol.Extent} extent The view extent (in map units).
+ * @param {number} resolution The view resolution.
+ * @param {ol.proj.Projection} projection The view projection.
+ * @return {olx.FrameState} The updated frame state.
+ * @private
+ */
+ol.source.Raster.prototype.updateFrameState_ =
+    function(extent, resolution, projection) {
+
+  var frameState = /** @type {olx.FrameState} */ (
+      goog.object.clone(this.frameState_));
+
+  frameState.viewState = /** @type {olx.ViewState} */ (
+      goog.object.clone(frameState.viewState));
+
+  var center = ol.extent.getCenter(extent);
+  var width = Math.round(ol.extent.getWidth(extent) / resolution);
+  var height = Math.round(ol.extent.getHeight(extent) / resolution);
+
+  frameState.extent = extent;
+  frameState.focus = ol.extent.getCenter(extent);
+  frameState.size[0] = width;
+  frameState.size[1] = height;
+
+  var viewState = frameState.viewState;
+  viewState.center = center;
+  viewState.projection = projection;
+  viewState.resolution = resolution;
+  return frameState;
+};
+
+
+/**
+ * Determine if the most recently rendered image canvas is dirty.
+ * @param {ol.Extent} extent The requested extent.
+ * @param {number} resolution The requested resolution.
+ * @return {boolean} The image is dirty.
+ * @private
+ */
+ol.source.Raster.prototype.isDirty_ = function(extent, resolution) {
+  var state = this.renderedState_;
+  return !state ||
+      this.getRevision() !== state.revision ||
+      resolution !== state.resolution ||
+      !ol.extent.equals(extent, state.extent);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.Raster.prototype.getImage =
+    function(extent, resolution, pixelRatio, projection) {
+
+  if (!this.allSourcesReady_()) {
+    return null;
+  }
+
+  if (!this.isDirty_(extent, resolution)) {
+    return this.renderedImageCanvas_;
+  }
+
+  var context = this.canvasContext_;
+  var canvas = context.canvas;
+
+  var width = Math.round(ol.extent.getWidth(extent) / resolution);
+  var height = Math.round(ol.extent.getHeight(extent) / resolution);
+
+  if (width !== canvas.width ||
+      height !== canvas.height) {
+    canvas.width = width;
+    canvas.height = height;
+  }
+
+  var frameState = this.updateFrameState_(extent, resolution, projection);
+
+  var imageCanvas = new ol.ImageCanvas(
+      extent, resolution, 1, this.getAttributions(), canvas,
+      this.composeFrame_.bind(this, frameState));
+
+  this.renderedImageCanvas_ = imageCanvas;
+
+  this.renderedState_ = {
+    extent: extent,
+    resolution: resolution,
+    revision: this.getRevision()
+  };
+
+  return imageCanvas;
+};
+
+
+/**
+ * Determine if all sources are ready.
+ * @return {boolean} All sources are ready.
+ * @private
+ */
+ol.source.Raster.prototype.allSourcesReady_ = function() {
+  var ready = true;
+  var source;
+  for (var i = 0, ii = this.renderers_.length; i < ii; ++i) {
+    source = this.renderers_[i].getLayer().getSource();
+    if (source.getState() !== ol.source.State.READY) {
+      ready = false;
+      break;
+    }
+  }
+  return ready;
+};
+
+
+/**
+ * Compose the frame.  This renders data from all sources, runs pixel-wise
+ * operations, and renders the result to the stored canvas context.
+ * @param {olx.FrameState} frameState The frame state.
+ * @param {function(Error)} callback Called when composition is complete.
+ * @private
+ */
+ol.source.Raster.prototype.composeFrame_ = function(frameState, callback) {
+  var len = this.renderers_.length;
+  var imageDatas = new Array(len);
+  for (var i = 0; i < len; ++i) {
+    var imageData = ol.source.Raster.getImageData_(
+        this.renderers_[i], frameState, frameState.layerStatesArray[i]);
+    if (imageData) {
+      imageDatas[i] = imageData;
+    } else {
+      // image not yet ready
+      return;
+    }
+  }
+
+  var data = {};
+  this.dispatchEvent(new ol.source.RasterEvent(
+      ol.source.RasterEventType.BEFOREOPERATIONS, frameState, data));
+
+  this.worker_.process(imageDatas, data,
+      this.onWorkerComplete_.bind(this, frameState, callback));
+
+  frameState.tileQueue.loadMoreTiles(16, 16);
+};
+
+
+/**
+ * Called when pixel processing is complete.
+ * @param {olx.FrameState} frameState The frame state.
+ * @param {function(Error)} callback Called when rendering is complete.
+ * @param {Error} err Any error during processing.
+ * @param {ImageData} output The output image data.
+ * @param {Object} data The user data.
+ * @private
+ */
+ol.source.Raster.prototype.onWorkerComplete_ =
+    function(frameState, callback, err, output, data) {
+  if (err) {
+    callback(err);
+    return;
+  }
+  if (!output) {
+    // job aborted
+    return;
+  }
+
+  this.dispatchEvent(new ol.source.RasterEvent(
+      ol.source.RasterEventType.AFTEROPERATIONS, frameState, data));
+
+  var resolution = frameState.viewState.resolution / frameState.pixelRatio;
+  if (!this.isDirty_(frameState.extent, resolution)) {
+    this.canvasContext_.putImageData(output, 0, 0);
+  }
+
+  callback(null);
+};
+
+
+/**
+ * Get image data from a renderer.
+ * @param {ol.renderer.canvas.Layer} renderer Layer renderer.
+ * @param {olx.FrameState} frameState The frame state.
+ * @param {ol.layer.LayerState} layerState The layer state.
+ * @return {ImageData} The image data.
+ * @private
+ */
+ol.source.Raster.getImageData_ = function(renderer, frameState, layerState) {
+  renderer.prepareFrame(frameState, layerState);
+  // We should be able to call renderer.composeFrame(), but this is inefficient
+  // for tiled sources (we've already rendered to an intermediate canvas in the
+  // prepareFrame call and we don't need to render again to the output canvas).
+  // TODO: make all canvas renderers render to a single canvas
+  var image = renderer.getImage();
+  if (!image) {
+    return null;
+  }
+  var imageTransform = renderer.getImageTransform();
+  var dx = Math.round(goog.vec.Mat4.getElement(imageTransform, 0, 3));
+  var dy = Math.round(goog.vec.Mat4.getElement(imageTransform, 1, 3));
+  var width = frameState.size[0];
+  var height = frameState.size[1];
+  if (image instanceof Image) {
+    if (!ol.source.Raster.context_) {
+      ol.source.Raster.context_ = ol.dom.createCanvasContext2D(width, height);
+    } else {
+      var canvas = ol.source.Raster.context_.canvas;
+      if (canvas.width !== width || canvas.height !== height) {
+        ol.source.Raster.context_ = ol.dom.createCanvasContext2D(width, height);
+      } else {
+        ol.source.Raster.context_.clearRect(0, 0, width, height);
+      }
+    }
+    var dw = Math.round(
+        image.width * goog.vec.Mat4.getElement(imageTransform, 0, 0));
+    var dh = Math.round(
+        image.height * goog.vec.Mat4.getElement(imageTransform, 1, 1));
+    ol.source.Raster.context_.drawImage(image, dx, dy, dw, dh);
+    return ol.source.Raster.context_.getImageData(0, 0, width, height);
+  } else {
+    return image.getContext('2d').getImageData(-dx, -dy, width, height);
+  }
+};
+
+
+/**
+ * A reusable canvas context.
+ * @type {CanvasRenderingContext2D}
+ * @private
+ */
+ol.source.Raster.context_ = null;
+
+
+/**
+ * Get a list of layer states from a list of renderers.
+ * @param {Array.<ol.renderer.canvas.Layer>} renderers Layer renderers.
+ * @return {Array.<ol.layer.LayerState>} The layer states.
+ * @private
+ */
+ol.source.Raster.getLayerStatesArray_ = function(renderers) {
+  return renderers.map(function(renderer) {
+    return renderer.getLayer().getLayerState();
+  });
+};
+
+
+/**
+ * Create renderers for all sources.
+ * @param {Array.<ol.source.Source>} sources The sources.
+ * @return {Array.<ol.renderer.canvas.Layer>} Array of layer renderers.
+ * @private
+ */
+ol.source.Raster.createRenderers_ = function(sources) {
+  var len = sources.length;
+  var renderers = new Array(len);
+  for (var i = 0; i < len; ++i) {
+    renderers[i] = ol.source.Raster.createRenderer_(sources[i]);
+  }
+  return renderers;
+};
+
+
+/**
+ * Create a renderer for the provided source.
+ * @param {ol.source.Source} source The source.
+ * @return {ol.renderer.canvas.Layer} The renderer.
+ * @private
+ */
+ol.source.Raster.createRenderer_ = function(source) {
+  var renderer = null;
+  if (source instanceof ol.source.Tile) {
+    renderer = ol.source.Raster.createTileRenderer_(source);
+  } else if (source instanceof ol.source.Image) {
+    renderer = ol.source.Raster.createImageRenderer_(source);
+  } else {
+    goog.asserts.fail('Unsupported source type: ' + source);
+  }
+  return renderer;
+};
+
+
+/**
+ * Create an image renderer for the provided source.
+ * @param {ol.source.Image} source The source.
+ * @return {ol.renderer.canvas.Layer} The renderer.
+ * @private
+ */
+ol.source.Raster.createImageRenderer_ = function(source) {
+  var layer = new ol.layer.Image({source: source});
+  return new ol.renderer.canvas.ImageLayer(layer);
+};
+
+
+/**
+ * Create a tile renderer for the provided source.
+ * @param {ol.source.Tile} source The source.
+ * @return {ol.renderer.canvas.Layer} The renderer.
+ * @private
+ */
+ol.source.Raster.createTileRenderer_ = function(source) {
+  var layer = new ol.layer.Tile({source: source});
+  return new ol.renderer.canvas.TileLayer(layer);
+};
+
+
+/**
+ * @typedef {{revision: number,
+ *            resolution: number,
+ *            extent: ol.Extent}}
+ */
+ol.source.Raster.RenderedState;
+
+
+
+/**
+ * @classdesc
+ * Events emitted by {@link ol.source.Raster} instances are instances of this
+ * type.
+ *
+ * @constructor
+ * @extends {goog.events.Event}
+ * @implements {oli.source.RasterEvent}
+ * @param {string} type Type.
+ * @param {olx.FrameState} frameState The frame state.
+ * @param {Object} data An object made available to operations.
+ */
+ol.source.RasterEvent = function(type, frameState, data) {
+  goog.base(this, type);
+
+  /**
+   * The raster extent.
+   * @type {ol.Extent}
+   * @api
+   */
+  this.extent = frameState.extent;
+
+  /**
+   * The pixel resolution (map units per pixel).
+   * @type {number}
+   * @api
+   */
+  this.resolution = frameState.viewState.resolution / frameState.pixelRatio;
+
+  /**
+   * An object made available to all operations.  This can be used by operations
+   * as a storage object (e.g. for calculating statistics).
+   * @type {Object}
+   * @api
+   */
+  this.data = data;
+
+};
+goog.inherits(ol.source.RasterEvent, goog.events.Event);
+
+
+/**
+ * @enum {string}
+ */
+ol.source.RasterEventType = {
+  /**
+   * Triggered before operations are run.
+   * @event ol.source.RasterEvent#beforeoperations
+   * @api
+   */
+  BEFOREOPERATIONS: 'beforeoperations',
+
+  /**
+   * Triggered after operations are run.
+   * @event ol.source.RasterEvent#afteroperations
+   * @api
+   */
+  AFTEROPERATIONS: 'afteroperations'
+};
+
+goog.provide('ol.source.Stamen');
+
+goog.require('goog.asserts');
+goog.require('ol.Attribution');
+goog.require('ol.source.OSM');
+goog.require('ol.source.XYZ');
+
+
+/**
+ * @type {Object.<string, {extension: string, opaque: boolean}>}
+ */
+ol.source.StamenLayerConfig = {
+  'terrain': {
+    extension: 'jpg',
+    opaque: true
+  },
+  'terrain-background': {
+    extension: 'jpg',
+    opaque: true
+  },
+  'terrain-labels': {
+    extension: 'png',
+    opaque: false
+  },
+  'terrain-lines': {
+    extension: 'png',
+    opaque: false
+  },
+  'toner-background': {
+    extension: 'png',
+    opaque: true
+  },
+  'toner': {
+    extension: 'png',
+    opaque: true
+  },
+  'toner-hybrid': {
+    extension: 'png',
+    opaque: false
+  },
+  'toner-labels': {
+    extension: 'png',
+    opaque: false
+  },
+  'toner-lines': {
+    extension: 'png',
+    opaque: false
+  },
+  'toner-lite': {
+    extension: 'png',
+    opaque: true
+  },
+  'watercolor': {
+    extension: 'jpg',
+    opaque: true
+  }
+};
+
+
+/**
+ * @type {Object.<string, {minZoom: number, maxZoom: number}>}
+ */
+ol.source.StamenProviderConfig = {
+  'terrain': {
+    minZoom: 4,
+    maxZoom: 18
+  },
+  'toner': {
+    minZoom: 0,
+    maxZoom: 20
+  },
+  'watercolor': {
+    minZoom: 3,
+    maxZoom: 16
+  }
+};
+
+
+
+/**
+ * @classdesc
+ * Layer source for the Stamen tile server.
+ *
+ * @constructor
+ * @extends {ol.source.XYZ}
+ * @param {olx.source.StamenOptions} options Stamen options.
+ * @api stable
+ */
+ol.source.Stamen = function(options) {
+
+  var i = options.layer.indexOf('-');
+  var provider = i == -1 ? options.layer : options.layer.slice(0, i);
+  goog.asserts.assert(provider in ol.source.StamenProviderConfig,
+      'known provider configured');
+  var providerConfig = ol.source.StamenProviderConfig[provider];
+
+  goog.asserts.assert(options.layer in ol.source.StamenLayerConfig,
+      'known layer configured');
+  var layerConfig = ol.source.StamenLayerConfig[options.layer];
+
+  var url = options.url !== undefined ? options.url :
+      'https://stamen-tiles-{a-d}.a.ssl.fastly.net/' + options.layer +
+      '/{z}/{x}/{y}.' + layerConfig.extension;
+
+  goog.base(this, {
+    attributions: ol.source.Stamen.ATTRIBUTIONS,
+    crossOrigin: 'anonymous',
+    maxZoom: providerConfig.maxZoom,
+    // FIXME uncomment the following when tilegrid supports minZoom
+    //minZoom: providerConfig.minZoom,
+    opaque: layerConfig.opaque,
+    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
+    tileLoadFunction: options.tileLoadFunction,
+    url: url
+  });
+
+};
+goog.inherits(ol.source.Stamen, ol.source.XYZ);
+
+
+/**
+ * @const
+ * @type {Array.<ol.Attribution>}
+ */
+ol.source.Stamen.ATTRIBUTIONS = [
+  new ol.Attribution({
+    html: 'Map tiles by <a href="http://stamen.com/">Stamen Design</a>, ' +
+        'under <a href="http://creativecommons.org/licenses/by/3.0/">CC BY' +
+        ' 3.0</a>.'
+  }),
+  ol.source.OSM.ATTRIBUTION
+];
+
+goog.provide('ol.source.TileArcGISRest');
+
+goog.require('goog.asserts');
+goog.require('goog.math');
+goog.require('goog.object');
+goog.require('goog.string');
+goog.require('goog.uri.utils');
+goog.require('ol');
+goog.require('ol.TileCoord');
+goog.require('ol.extent');
+goog.require('ol.proj');
+goog.require('ol.size');
+goog.require('ol.source.TileImage');
+goog.require('ol.tilecoord');
+
+
+
+/**
+ * @classdesc
+ * Layer source for tile data from ArcGIS Rest services. Map and Image
+ * Services are supported.
+ *
+ * For cached ArcGIS services, better performance is available using the
+ * {@link ol.source.XYZ} data source.
+ *
+ * @constructor
+ * @extends {ol.source.TileImage}
+ * @param {olx.source.TileArcGISRestOptions=} opt_options Tile ArcGIS Rest
+ *     options.
+ * @api
+ */
+ol.source.TileArcGISRest = function(opt_options) {
+
+  var options = opt_options || {};
+
+  var params = options.params !== undefined ? options.params : {};
+
+  goog.base(this, {
+    attributions: options.attributions,
+    crossOrigin: options.crossOrigin,
+    logo: options.logo,
+    projection: options.projection,
+    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
+    tileGrid: options.tileGrid,
+    tileLoadFunction: options.tileLoadFunction,
+    tileUrlFunction: goog.bind(this.tileUrlFunction_, this),
+    url: options.url,
+    urls: options.urls,
+    wrapX: options.wrapX !== undefined ? options.wrapX : true
+  });
+
+  /**
+   * @private
+   * @type {Object}
+   */
+  this.params_ = params;
+
+  /**
+   * @private
+   * @type {ol.Extent}
+   */
+  this.tmpExtent_ = ol.extent.createEmpty();
+
+};
+goog.inherits(ol.source.TileArcGISRest, ol.source.TileImage);
+
+
+/**
+ * Get the user-provided params, i.e. those passed to the constructor through
+ * the "params" option, and possibly updated using the updateParams method.
+ * @return {Object} Params.
+ * @api
+ */
+ol.source.TileArcGISRest.prototype.getParams = function() {
+  return this.params_;
+};
+
+
+/**
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {ol.Size} tileSize Tile size.
+ * @param {ol.Extent} tileExtent Tile extent.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.proj.Projection} projection Projection.
+ * @param {Object} params Params.
+ * @return {string|undefined} Request URL.
+ * @private
+ */
+ol.source.TileArcGISRest.prototype.getRequestUrl_ =
+    function(tileCoord, tileSize, tileExtent,
+        pixelRatio, projection, params) {
+
+  var urls = this.urls;
+  if (!urls) {
+    return undefined;
+  }
+
+  // ArcGIS Server only wants the numeric portion of the projection ID.
+  var srid = projection.getCode().split(':').pop();
+
+  params['SIZE'] = tileSize[0] + ',' + tileSize[1];
+  params['BBOX'] = tileExtent.join(',');
+  params['BBOXSR'] = srid;
+  params['IMAGESR'] = srid;
+  params['DPI'] = Math.round(
+      params['DPI'] ? params['DPI'] * pixelRatio : 90 * pixelRatio
+      );
+
+  var url;
+  if (urls.length == 1) {
+    url = urls[0];
+  } else {
+    var index = goog.math.modulo(ol.tilecoord.hash(tileCoord), urls.length);
+    url = urls[index];
+  }
+
+  if (!goog.string.endsWith(url, '/')) {
+    url = url + '/';
+  }
+
+  // If a MapServer, use export. If an ImageServer, use exportImage.
+  if (goog.string.endsWith(url, 'MapServer/')) {
+    url = url + 'export';
+  }
+  else if (goog.string.endsWith(url, 'ImageServer/')) {
+    url = url + 'exportImage';
+  }
+  else {
+    goog.asserts.fail('Unknown Rest Service', url);
+  }
+
+  return goog.uri.utils.appendParamsFromMap(url, params);
+};
+
+
+/**
+ * @param {number} z Z.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {ol.Size} Size.
+ */
+ol.source.TileArcGISRest.prototype.getTilePixelSize =
+    function(z, pixelRatio, projection) {
+  var tileSize = goog.base(this, 'getTilePixelSize', z, pixelRatio, projection);
+  if (pixelRatio == 1) {
+    return tileSize;
+  } else {
+    return ol.size.scale(tileSize, pixelRatio, this.tmpSize);
+  }
+};
+
+
+/**
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {string|undefined} Tile URL.
+ * @private
+ */
+ol.source.TileArcGISRest.prototype.tileUrlFunction_ =
+    function(tileCoord, pixelRatio, projection) {
+
+  var tileGrid = this.getTileGrid();
+  if (!tileGrid) {
+    tileGrid = this.getTileGridForProjection(projection);
+  }
+
+  if (tileGrid.getResolutions().length <= tileCoord[0]) {
+    return undefined;
+  }
+
+  var tileExtent = tileGrid.getTileCoordExtent(
+      tileCoord, this.tmpExtent_);
+  var tileSize = ol.size.toSize(
+      tileGrid.getTileSize(tileCoord[0]), this.tmpSize);
+
+  if (pixelRatio != 1) {
+    tileSize = ol.size.scale(tileSize, pixelRatio, this.tmpSize);
+  }
+
+  // Apply default params and override with user specified values.
+  var baseParams = {
+    'F': 'image',
+    'FORMAT': 'PNG32',
+    'TRANSPARENT': true
+  };
+  goog.object.extend(baseParams, this.params_);
+
+  return this.getRequestUrl_(tileCoord, tileSize, tileExtent,
+      pixelRatio, projection, baseParams);
+};
+
+
+/**
+ * Update the user-provided params.
+ * @param {Object} params Params.
+ * @api stable
+ */
+ol.source.TileArcGISRest.prototype.updateParams = function(params) {
+  goog.object.extend(this.params_, params);
+  this.changed();
+};
+
+goog.provide('ol.source.TileDebug');
+
+goog.require('ol.Tile');
+goog.require('ol.TileCoord');
+goog.require('ol.TileState');
+goog.require('ol.dom');
+goog.require('ol.size');
+goog.require('ol.source.Tile');
+goog.require('ol.tilecoord');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.Tile}
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {ol.Size} tileSize Tile size.
+ * @param {string} text Text.
+ * @private
+ */
+ol.DebugTile_ = function(tileCoord, tileSize, text) {
+
+  goog.base(this, tileCoord, ol.TileState.LOADED);
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.tileSize_ = tileSize;
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.text_ = text;
+
+  /**
+   * @private
+   * @type {Object.<number, HTMLCanvasElement>}
+   */
+  this.canvasByContext_ = {};
+
+};
+goog.inherits(ol.DebugTile_, ol.Tile);
+
+
+/**
+ * Get the image element for this tile.
+ * @param {Object=} opt_context Optional context. Only used by the DOM
+ *     renderer.
+ * @return {HTMLCanvasElement} Image.
+ */
+ol.DebugTile_.prototype.getImage = function(opt_context) {
+  var key = opt_context !== undefined ? goog.getUid(opt_context) : -1;
+  if (key in this.canvasByContext_) {
+    return this.canvasByContext_[key];
+  } else {
+
+    var tileSize = this.tileSize_;
+    var context = ol.dom.createCanvasContext2D(tileSize[0], tileSize[1]);
+
+    context.strokeStyle = 'black';
+    context.strokeRect(0.5, 0.5, tileSize[0] + 0.5, tileSize[1] + 0.5);
+
+    context.fillStyle = 'black';
+    context.textAlign = 'center';
+    context.textBaseline = 'middle';
+    context.font = '24px sans-serif';
+    context.fillText(this.text_, tileSize[0] / 2, tileSize[1] / 2);
+
+    this.canvasByContext_[key] = context.canvas;
+    return context.canvas;
+
+  }
+};
+
+
+
+/**
+ * @classdesc
+ * A pseudo tile source, which does not fetch tiles from a server, but renders
+ * a grid outline for the tile grid/projection along with the coordinates for
+ * each tile. See examples/canvas-tiles for an example.
+ *
+ * Uses Canvas context2d, so requires Canvas support.
+ *
+ * @constructor
+ * @extends {ol.source.Tile}
+ * @param {olx.source.TileDebugOptions} options Debug tile options.
+ * @api
+ */
+ol.source.TileDebug = function(options) {
+
+  goog.base(this, {
+    opaque: false,
+    projection: options.projection,
+    tileGrid: options.tileGrid,
+    wrapX: options.wrapX !== undefined ? options.wrapX : true
+  });
+
+};
+goog.inherits(ol.source.TileDebug, ol.source.Tile);
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileDebug.prototype.getTile = function(z, x, y) {
+  var tileCoordKey = this.getKeyZXY(z, x, y);
+  if (this.tileCache.containsKey(tileCoordKey)) {
+    return /** @type {!ol.DebugTile_} */ (this.tileCache.get(tileCoordKey));
+  } else {
+    var tileSize = ol.size.toSize(this.tileGrid.getTileSize(z));
+    var tileCoord = [z, x, y];
+    var textTileCoord = this.getTileCoordForTileUrlFunction(tileCoord);
+    var text = !textTileCoord ? '' : ol.tilecoord.toString(
+        this.getTileCoordForTileUrlFunction(textTileCoord));
+    var tile = new ol.DebugTile_(tileCoord, tileSize, text);
+    this.tileCache.set(tileCoordKey, tile);
+    return tile;
+  }
+};
+
+// FIXME check order of async callbacks
+
+/**
+ * @see http://mapbox.com/developers/api/
+ */
+
+goog.provide('ol.source.TileJSON');
+goog.provide('ol.tilejson');
+
+goog.require('goog.asserts');
+goog.require('goog.net.Jsonp');
+goog.require('ol.Attribution');
+goog.require('ol.TileRange');
+goog.require('ol.TileUrlFunction');
+goog.require('ol.extent');
+goog.require('ol.proj');
+goog.require('ol.source.State');
+goog.require('ol.source.TileImage');
+
+
+
+/**
+ * @classdesc
+ * Layer source for tile data in TileJSON format.
+ *
+ * @constructor
+ * @extends {ol.source.TileImage}
+ * @param {olx.source.TileJSONOptions} options TileJSON options.
+ * @api stable
+ */
+ol.source.TileJSON = function(options) {
+
+  goog.base(this, {
+    attributions: options.attributions,
+    crossOrigin: options.crossOrigin,
+    projection: ol.proj.get('EPSG:3857'),
+    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
+    state: ol.source.State.LOADING,
+    tileLoadFunction: options.tileLoadFunction,
+    wrapX: options.wrapX !== undefined ? options.wrapX : true
+  });
+
+  var request = new goog.net.Jsonp(options.url);
+  request.send(undefined, goog.bind(this.handleTileJSONResponse, this),
+      goog.bind(this.handleTileJSONError, this));
+
+};
+goog.inherits(ol.source.TileJSON, ol.source.TileImage);
+
+
+/**
+ * @protected
+ * @param {TileJSON} tileJSON Tile JSON.
+ */
+ol.source.TileJSON.prototype.handleTileJSONResponse = function(tileJSON) {
+
+  var epsg4326Projection = ol.proj.get('EPSG:4326');
+
+  var sourceProjection = this.getProjection();
+  var extent;
+  if (tileJSON.bounds !== undefined) {
+    var transform = ol.proj.getTransformFromProjections(
+        epsg4326Projection, sourceProjection);
+    extent = ol.extent.applyTransform(tileJSON.bounds, transform);
+  }
+
+  if (tileJSON.scheme !== undefined) {
+    goog.asserts.assert(tileJSON.scheme == 'xyz', 'tileJSON-scheme is "xyz"');
+  }
+  var minZoom = tileJSON.minzoom || 0;
+  var maxZoom = tileJSON.maxzoom || 22;
+  var tileGrid = ol.tilegrid.createXYZ({
+    extent: ol.tilegrid.extentFromProjection(sourceProjection),
+    maxZoom: maxZoom,
+    minZoom: minZoom
+  });
+  this.tileGrid = tileGrid;
+
+  this.tileUrlFunction =
+      ol.TileUrlFunction.createFromTemplates(tileJSON.tiles, tileGrid);
+
+  if (tileJSON.attribution !== undefined && !this.getAttributions()) {
+    var attributionExtent = extent !== undefined ?
+        extent : epsg4326Projection.getExtent();
+    /** @type {Object.<string, Array.<ol.TileRange>>} */
+    var tileRanges = {};
+    var z, zKey;
+    for (z = minZoom; z <= maxZoom; ++z) {
+      zKey = z.toString();
+      tileRanges[zKey] =
+          [tileGrid.getTileRangeForExtentAndZ(attributionExtent, z)];
+    }
+    this.setAttributions([
+      new ol.Attribution({
+        html: tileJSON.attribution,
+        tileRanges: tileRanges
+      })
+    ]);
+  }
+
+  this.setState(ol.source.State.READY);
+
+};
+
+
+/**
+ * @protected
+ */
+ol.source.TileJSON.prototype.handleTileJSONError = function() {
+  this.setState(ol.source.State.ERROR);
+};
+
+goog.provide('ol.source.TileUTFGrid');
+
+goog.require('goog.asserts');
+goog.require('goog.async.nextTick');
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('goog.net.Jsonp');
+goog.require('ol.Attribution');
+goog.require('ol.Tile');
+goog.require('ol.TileState');
+goog.require('ol.TileUrlFunction');
+goog.require('ol.extent');
+goog.require('ol.proj');
+goog.require('ol.source.State');
+goog.require('ol.source.Tile');
+
+
+
+/**
+ * @classdesc
+ * Layer source for UTFGrid interaction data loaded from TileJSON format.
+ *
+ * @constructor
+ * @extends {ol.source.Tile}
+ * @param {olx.source.TileUTFGridOptions} options Source options.
+ * @api
+ */
+ol.source.TileUTFGrid = function(options) {
+  goog.base(this, {
+    projection: ol.proj.get('EPSG:3857'),
+    state: ol.source.State.LOADING
+  });
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.preemptive_ = options.preemptive !== undefined ?
+      options.preemptive : true;
+
+  /**
+   * @private
+   * @type {!ol.TileUrlFunctionType}
+   */
+  this.tileUrlFunction_ = ol.TileUrlFunction.nullTileUrlFunction;
+
+  /**
+   * @private
+   * @type {string|undefined}
+   */
+  this.template_ = undefined;
+
+  var request = new goog.net.Jsonp(options.url);
+  request.send(undefined, goog.bind(this.handleTileJSONResponse, this));
+};
+goog.inherits(ol.source.TileUTFGrid, ol.source.Tile);
+
+
+/**
+ * Return the template from TileJSON.
+ * @return {string|undefined} The template from TileJSON.
+ * @api
+ */
+ol.source.TileUTFGrid.prototype.getTemplate = function() {
+  return this.template_;
+};
+
+
+/**
+ * Calls the callback (synchronously by default) with the available data
+ * for given coordinate and resolution (or `null` if not yet loaded or
+ * in case of an error).
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {number} resolution Resolution.
+ * @param {function(this: T, Object)} callback Callback.
+ * @param {T=} opt_this The object to use as `this` in the callback.
+ * @param {boolean=} opt_request If `true` the callback is always async.
+ *                               The tile data is requested if not yet loaded.
+ * @template T
+ * @api
+ */
+ol.source.TileUTFGrid.prototype.forDataAtCoordinateAndResolution = function(
+    coordinate, resolution, callback, opt_this, opt_request) {
+  if (this.tileGrid) {
+    var tileCoord = this.tileGrid.getTileCoordForCoordAndResolution(
+        coordinate, resolution);
+    var tile = /** @type {!ol.source.TileUTFGridTile_} */(this.getTile(
+        tileCoord[0], tileCoord[1], tileCoord[2], 1, this.getProjection()));
+    tile.forDataAtCoordinate(coordinate, callback, opt_this, opt_request);
+  } else {
+    if (opt_request === true) {
+      goog.async.nextTick(function() {
+        callback.call(opt_this, null);
+      });
+    } else {
+      callback.call(opt_this, null);
+    }
+  }
+};
+
+
+/**
+ * TODO: very similar to ol.source.TileJSON#handleTileJSONResponse
+ * @protected
+ * @param {TileJSON} tileJSON Tile JSON.
+ */
+ol.source.TileUTFGrid.prototype.handleTileJSONResponse = function(tileJSON) {
+
+  var epsg4326Projection = ol.proj.get('EPSG:4326');
+
+  var sourceProjection = this.getProjection();
+  var extent;
+  if (tileJSON.bounds !== undefined) {
+    var transform = ol.proj.getTransformFromProjections(
+        epsg4326Projection, sourceProjection);
+    extent = ol.extent.applyTransform(tileJSON.bounds, transform);
+  }
+
+  if (tileJSON.scheme !== undefined) {
+    goog.asserts.assert(tileJSON.scheme == 'xyz', 'tileJSON-scheme is "xyz"');
+  }
+  var minZoom = tileJSON.minzoom || 0;
+  var maxZoom = tileJSON.maxzoom || 22;
+  var tileGrid = ol.tilegrid.createXYZ({
+    extent: ol.tilegrid.extentFromProjection(sourceProjection),
+    maxZoom: maxZoom,
+    minZoom: minZoom
+  });
+  this.tileGrid = tileGrid;
+
+  this.template_ = tileJSON.template;
+
+  var grids = tileJSON.grids;
+  if (!grids) {
+    this.setState(ol.source.State.ERROR);
+    return;
+  }
+
+  this.tileUrlFunction_ =
+      ol.TileUrlFunction.createFromTemplates(grids, tileGrid);
+
+  if (tileJSON.attribution !== undefined) {
+    var attributionExtent = extent !== undefined ?
+        extent : epsg4326Projection.getExtent();
+    /** @type {Object.<string, Array.<ol.TileRange>>} */
+    var tileRanges = {};
+    var z, zKey;
+    for (z = minZoom; z <= maxZoom; ++z) {
+      zKey = z.toString();
+      tileRanges[zKey] =
+          [tileGrid.getTileRangeForExtentAndZ(attributionExtent, z)];
+    }
+    this.setAttributions([
+      new ol.Attribution({
+        html: tileJSON.attribution,
+        tileRanges: tileRanges
+      })
+    ]);
+  }
+
+  this.setState(ol.source.State.READY);
+
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileUTFGrid.prototype.getTile =
+    function(z, x, y, pixelRatio, projection) {
+  var tileCoordKey = this.getKeyZXY(z, x, y);
+  if (this.tileCache.containsKey(tileCoordKey)) {
+    return /** @type {!ol.Tile} */ (this.tileCache.get(tileCoordKey));
+  } else {
+    goog.asserts.assert(projection, 'argument projection is truthy');
+    var tileCoord = [z, x, y];
+    var urlTileCoord =
+        this.getTileCoordForTileUrlFunction(tileCoord, projection);
+    var tileUrl = this.tileUrlFunction_(urlTileCoord, pixelRatio, projection);
+    var tile = new ol.source.TileUTFGridTile_(
+        tileCoord,
+        tileUrl !== undefined ? ol.TileState.IDLE : ol.TileState.EMPTY,
+        tileUrl !== undefined ? tileUrl : '',
+        this.tileGrid.getTileCoordExtent(tileCoord),
+        this.preemptive_);
+    this.tileCache.set(tileCoordKey, tile);
+    return tile;
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileUTFGrid.prototype.useTile = function(z, x, y) {
+  var tileCoordKey = this.getKeyZXY(z, x, y);
+  if (this.tileCache.containsKey(tileCoordKey)) {
+    this.tileCache.get(tileCoordKey);
+  }
+};
+
+
+
+/**
+ * @constructor
+ * @extends {ol.Tile}
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {ol.TileState} state State.
+ * @param {string} src Image source URI.
+ * @param {ol.Extent} extent Extent of the tile.
+ * @param {boolean} preemptive Load the tile when visible (before it's needed).
+ * @private
+ */
+ol.source.TileUTFGridTile_ =
+    function(tileCoord, state, src, extent, preemptive) {
+
+  goog.base(this, tileCoord, state);
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.src_ = src;
+
+  /**
+   * @private
+   * @type {ol.Extent}
+   */
+  this.extent_ = extent;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.preemptive_ = preemptive;
+
+  /**
+   * @private
+   * @type {Array.<string>}
+   */
+  this.grid_ = null;
+
+  /**
+   * @private
+   * @type {Array.<string>}
+   */
+  this.keys_ = null;
+
+  /**
+   * @private
+   * @type {Object.<string, Object>|undefined}
+   */
+  this.data_ = null;
+};
+goog.inherits(ol.source.TileUTFGridTile_, ol.Tile);
+
+
+/**
+ * Get the image element for this tile.
+ * @param {Object=} opt_context Optional context. Only used for the DOM
+ *     renderer.
+ * @return {Image} Image.
+ */
+ol.source.TileUTFGridTile_.prototype.getImage = function(opt_context) {
+  return null;
+};
+
+
+/**
+ * Synchronously returns data at given coordinate (if available).
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @return {Object}
+ */
+ol.source.TileUTFGridTile_.prototype.getData = function(coordinate) {
+  if (!this.grid_ || !this.keys_ || !this.data_) {
+    return null;
+  }
+  var xRelative = (coordinate[0] - this.extent_[0]) /
+      (this.extent_[2] - this.extent_[0]);
+  var yRelative = (coordinate[1] - this.extent_[1]) /
+      (this.extent_[3] - this.extent_[1]);
+
+  var row = this.grid_[Math.floor((1 - yRelative) * this.grid_.length)];
+
+  if (!goog.isString(row)) {
+    return null;
+  }
+
+  var code = row.charCodeAt(Math.floor(xRelative * row.length));
+  if (code >= 93) {
+    code--;
+  }
+  if (code >= 35) {
+    code--;
+  }
+  code -= 32;
+
+  return (code in this.keys_) ? this.data_[this.keys_[code]] : null;
+};
+
+
+/**
+ * Calls the callback (synchronously by default) with the available data
+ * for given coordinate (or `null` if not yet loaded).
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {function(this: T, Object)} callback Callback.
+ * @param {T=} opt_this The object to use as `this` in the callback.
+ * @param {boolean=} opt_request If `true` the callback is always async.
+ *                               The tile data is requested if not yet loaded.
+ * @template T
+ */
+ol.source.TileUTFGridTile_.prototype.forDataAtCoordinate =
+    function(coordinate, callback, opt_this, opt_request) {
+  if (this.state == ol.TileState.IDLE && opt_request === true) {
+    goog.events.listenOnce(this, goog.events.EventType.CHANGE, function(e) {
+      callback.call(opt_this, this.getData(coordinate));
+    }, false, this);
+    this.loadInternal_();
+  } else {
+    if (opt_request === true) {
+      goog.async.nextTick(function() {
+        callback.call(opt_this, this.getData(coordinate));
+      }, this);
+    } else {
+      callback.call(opt_this, this.getData(coordinate));
+    }
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileUTFGridTile_.prototype.getKey = function() {
+  return this.src_;
+};
+
+
+/**
+ * @private
+ */
+ol.source.TileUTFGridTile_.prototype.handleError_ = function() {
+  this.state = ol.TileState.ERROR;
+  this.changed();
+};
+
+
+/**
+ * @param {!UTFGridJSON} json
+ * @private
+ */
+ol.source.TileUTFGridTile_.prototype.handleLoad_ = function(json) {
+  this.grid_ = json.grid;
+  this.keys_ = json.keys;
+  this.data_ = json.data;
+
+  this.state = ol.TileState.EMPTY;
+  this.changed();
+};
+
+
+/**
+ * @private
+ */
+ol.source.TileUTFGridTile_.prototype.loadInternal_ = function() {
+  if (this.state == ol.TileState.IDLE) {
+    this.state = ol.TileState.LOADING;
+    var request = new goog.net.Jsonp(this.src_);
+    request.send(undefined, goog.bind(this.handleLoad_, this),
+                 goog.bind(this.handleError_, this));
+  }
+};
+
+
+/**
+ * Load not yet loaded URI.
+ */
+ol.source.TileUTFGridTile_.prototype.load = function() {
+  if (this.preemptive_) {
+    this.loadInternal_();
+  }
+};
+
+// FIXME add minZoom support
+// FIXME add date line wrap (tile coord transform)
+// FIXME cannot be shared between maps with different projections
+
+goog.provide('ol.source.TileWMS');
+
+goog.require('goog.asserts');
+goog.require('goog.math');
+goog.require('goog.object');
+goog.require('goog.string');
+goog.require('goog.uri.utils');
+goog.require('ol');
+goog.require('ol.TileCoord');
+goog.require('ol.extent');
+goog.require('ol.proj');
+goog.require('ol.size');
+goog.require('ol.source.TileImage');
+goog.require('ol.source.wms');
+goog.require('ol.source.wms.ServerType');
+goog.require('ol.tilecoord');
+
+
+
+/**
+ * @classdesc
+ * Layer source for tile data from WMS servers.
+ *
+ * @constructor
+ * @extends {ol.source.TileImage}
+ * @param {olx.source.TileWMSOptions=} opt_options Tile WMS options.
+ * @api stable
+ */
+ol.source.TileWMS = function(opt_options) {
+
+  var options = opt_options || {};
+
+  var params = options.params !== undefined ? options.params : {};
+
+  var transparent = goog.object.get(params, 'TRANSPARENT', true);
+
+  goog.base(this, {
+    attributions: options.attributions,
+    crossOrigin: options.crossOrigin,
+    logo: options.logo,
+    opaque: !transparent,
+    projection: options.projection,
+    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
+    tileGrid: options.tileGrid,
+    tileLoadFunction: options.tileLoadFunction,
+    tileUrlFunction: goog.bind(this.tileUrlFunction_, this),
+    url: options.url,
+    urls: options.urls,
+    wrapX: options.wrapX !== undefined ? options.wrapX : true
+  });
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.gutter_ = options.gutter !== undefined ? options.gutter : 0;
+
+  /**
+   * @private
+   * @type {Object}
+   */
+  this.params_ = params;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.v13_ = true;
+
+  /**
+   * @private
+   * @type {ol.source.wms.ServerType|undefined}
+   */
+  this.serverType_ =
+      /** @type {ol.source.wms.ServerType|undefined} */ (options.serverType);
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.hidpi_ = options.hidpi !== undefined ? options.hidpi : true;
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.coordKeyPrefix_ = '';
+  this.resetCoordKeyPrefix_();
+
+  /**
+   * @private
+   * @type {ol.Extent}
+   */
+  this.tmpExtent_ = ol.extent.createEmpty();
+
+  this.updateV13_();
+
+};
+goog.inherits(ol.source.TileWMS, ol.source.TileImage);
+
+
+/**
+ * Return the GetFeatureInfo URL for the passed coordinate, resolution, and
+ * projection. Return `undefined` if the GetFeatureInfo URL cannot be
+ * constructed.
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {number} resolution Resolution.
+ * @param {ol.proj.ProjectionLike} projection Projection.
+ * @param {!Object} params GetFeatureInfo params. `INFO_FORMAT` at least should
+ *     be provided. If `QUERY_LAYERS` is not provided then the layers specified
+ *     in the `LAYERS` parameter will be used. `VERSION` should not be
+ *     specified here.
+ * @return {string|undefined} GetFeatureInfo URL.
+ * @api stable
+ */
+ol.source.TileWMS.prototype.getGetFeatureInfoUrl =
+    function(coordinate, resolution, projection, params) {
+
+  goog.asserts.assert(!('VERSION' in params),
+      'key VERSION is not allowed in params');
+
+  var projectionObj = ol.proj.get(projection);
+
+  var tileGrid = this.getTileGrid();
+  if (!tileGrid) {
+    tileGrid = this.getTileGridForProjection(projectionObj);
+  }
+
+  var tileCoord = tileGrid.getTileCoordForCoordAndResolution(
+      coordinate, resolution);
+
+  if (tileGrid.getResolutions().length <= tileCoord[0]) {
+    return undefined;
+  }
+
+  var tileResolution = tileGrid.getResolution(tileCoord[0]);
+  var tileExtent = tileGrid.getTileCoordExtent(tileCoord, this.tmpExtent_);
+  var tileSize = ol.size.toSize(
+      tileGrid.getTileSize(tileCoord[0]), this.tmpSize);
+
+  var gutter = this.gutter_;
+  if (gutter !== 0) {
+    tileSize = ol.size.buffer(tileSize, gutter, this.tmpSize);
+    tileExtent = ol.extent.buffer(tileExtent,
+        tileResolution * gutter, tileExtent);
+  }
+
+  var baseParams = {
+    'SERVICE': 'WMS',
+    'VERSION': ol.DEFAULT_WMS_VERSION,
+    'REQUEST': 'GetFeatureInfo',
+    'FORMAT': 'image/png',
+    'TRANSPARENT': true,
+    'QUERY_LAYERS': this.params_['LAYERS']
+  };
+  goog.object.extend(baseParams, this.params_, params);
+
+  var x = Math.floor((coordinate[0] - tileExtent[0]) / tileResolution);
+  var y = Math.floor((tileExtent[3] - coordinate[1]) / tileResolution);
+
+  baseParams[this.v13_ ? 'I' : 'X'] = x;
+  baseParams[this.v13_ ? 'J' : 'Y'] = y;
+
+  return this.getRequestUrl_(tileCoord, tileSize, tileExtent,
+      1, projectionObj, baseParams);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileWMS.prototype.getGutter = function() {
+  return this.gutter_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileWMS.prototype.getKeyZXY = function(z, x, y) {
+  return this.coordKeyPrefix_ + goog.base(this, 'getKeyZXY', z, x, y);
+};
+
+
+/**
+ * Get the user-provided params, i.e. those passed to the constructor through
+ * the "params" option, and possibly updated using the updateParams method.
+ * @return {Object} Params.
+ * @api stable
+ */
+ol.source.TileWMS.prototype.getParams = function() {
+  return this.params_;
+};
+
+
+/**
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {ol.Size} tileSize Tile size.
+ * @param {ol.Extent} tileExtent Tile extent.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.proj.Projection} projection Projection.
+ * @param {Object} params Params.
+ * @return {string|undefined} Request URL.
+ * @private
+ */
+ol.source.TileWMS.prototype.getRequestUrl_ =
+    function(tileCoord, tileSize, tileExtent,
+        pixelRatio, projection, params) {
+
+  var urls = this.urls;
+  if (!urls) {
+    return undefined;
+  }
+
+  params['WIDTH'] = tileSize[0];
+  params['HEIGHT'] = tileSize[1];
+
+  params[this.v13_ ? 'CRS' : 'SRS'] = projection.getCode();
+
+  if (!('STYLES' in this.params_)) {
+    /* jshint -W053 */
+    params['STYLES'] = new String('');
+    /* jshint +W053 */
+  }
+
+  if (pixelRatio != 1) {
+    switch (this.serverType_) {
+      case ol.source.wms.ServerType.GEOSERVER:
+        var dpi = (90 * pixelRatio + 0.5) | 0;
+        if ('FORMAT_OPTIONS' in params) {
+          params['FORMAT_OPTIONS'] += ';dpi:' + dpi;
+        } else {
+          params['FORMAT_OPTIONS'] = 'dpi:' + dpi;
+        }
+        break;
+      case ol.source.wms.ServerType.MAPSERVER:
+        params['MAP_RESOLUTION'] = 90 * pixelRatio;
+        break;
+      case ol.source.wms.ServerType.CARMENTA_SERVER:
+      case ol.source.wms.ServerType.QGIS:
+        params['DPI'] = 90 * pixelRatio;
+        break;
+      default:
+        goog.asserts.fail('unknown serverType configured');
+        break;
+    }
+  }
+
+  var axisOrientation = projection.getAxisOrientation();
+  var bbox = tileExtent;
+  if (this.v13_ && axisOrientation.substr(0, 2) == 'ne') {
+    var tmp;
+    tmp = tileExtent[0];
+    bbox[0] = tileExtent[1];
+    bbox[1] = tmp;
+    tmp = tileExtent[2];
+    bbox[2] = tileExtent[3];
+    bbox[3] = tmp;
+  }
+  params['BBOX'] = bbox.join(',');
+
+  var url;
+  if (urls.length == 1) {
+    url = urls[0];
+  } else {
+    var index = goog.math.modulo(ol.tilecoord.hash(tileCoord), urls.length);
+    url = urls[index];
+  }
+  return goog.uri.utils.appendParamsFromMap(url, params);
+};
+
+
+/**
+ * @param {number} z Z.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {ol.Size} Size.
+ */
+ol.source.TileWMS.prototype.getTilePixelSize =
+    function(z, pixelRatio, projection) {
+  var tileSize = goog.base(this, 'getTilePixelSize', z, pixelRatio, projection);
+  if (pixelRatio == 1 || !this.hidpi_ || this.serverType_ === undefined) {
+    return tileSize;
+  } else {
+    return ol.size.scale(tileSize, pixelRatio, this.tmpSize);
+  }
+};
+
+
+/**
+ * @private
+ */
+ol.source.TileWMS.prototype.resetCoordKeyPrefix_ = function() {
+  var i = 0;
+  var res = [];
+
+  if (this.urls) {
+    var j, jj;
+    for (j = 0, jj = this.urls.length; j < jj; ++j) {
+      res[i++] = this.urls[j];
+    }
+  }
+
+  var key;
+  for (key in this.params_) {
+    res[i++] = key + '-' + this.params_[key];
+  }
+
+  this.coordKeyPrefix_ = res.join('#');
+};
+
+
+/**
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {string|undefined} Tile URL.
+ * @private
+ */
+ol.source.TileWMS.prototype.tileUrlFunction_ =
+    function(tileCoord, pixelRatio, projection) {
+
+  var tileGrid = this.getTileGrid();
+  if (!tileGrid) {
+    tileGrid = this.getTileGridForProjection(projection);
+  }
+
+  if (tileGrid.getResolutions().length <= tileCoord[0]) {
+    return undefined;
+  }
+
+  if (pixelRatio != 1 && (!this.hidpi_ || this.serverType_ === undefined)) {
+    pixelRatio = 1;
+  }
+
+  var tileResolution = tileGrid.getResolution(tileCoord[0]);
+  var tileExtent = tileGrid.getTileCoordExtent(tileCoord, this.tmpExtent_);
+  var tileSize = ol.size.toSize(
+      tileGrid.getTileSize(tileCoord[0]), this.tmpSize);
+
+  var gutter = this.gutter_;
+  if (gutter !== 0) {
+    tileSize = ol.size.buffer(tileSize, gutter, this.tmpSize);
+    tileExtent = ol.extent.buffer(tileExtent,
+        tileResolution * gutter, tileExtent);
+  }
+
+  if (pixelRatio != 1) {
+    tileSize = ol.size.scale(tileSize, pixelRatio, this.tmpSize);
+  }
+
+  var baseParams = {
+    'SERVICE': 'WMS',
+    'VERSION': ol.DEFAULT_WMS_VERSION,
+    'REQUEST': 'GetMap',
+    'FORMAT': 'image/png',
+    'TRANSPARENT': true
+  };
+  goog.object.extend(baseParams, this.params_);
+
+  return this.getRequestUrl_(tileCoord, tileSize, tileExtent,
+      pixelRatio, projection, baseParams);
+};
+
+
+/**
+ * Update the user-provided params.
+ * @param {Object} params Params.
+ * @api stable
+ */
+ol.source.TileWMS.prototype.updateParams = function(params) {
+  goog.object.extend(this.params_, params);
+  this.resetCoordKeyPrefix_();
+  this.updateV13_();
+  this.changed();
+};
+
+
+/**
+ * @private
+ */
+ol.source.TileWMS.prototype.updateV13_ = function() {
+  var version =
+      goog.object.get(this.params_, 'VERSION', ol.DEFAULT_WMS_VERSION);
+  this.v13_ = goog.string.compareVersions(version, '1.3') >= 0;
+};
+
+goog.provide('ol.tilegrid.WMTS');
+
+goog.require('goog.asserts');
+goog.require('ol.proj');
+goog.require('ol.tilegrid.TileGrid');
+
+
+
+/**
+ * @classdesc
+ * Set the grid pattern for sources accessing WMTS tiled-image servers.
+ *
+ * @constructor
+ * @extends {ol.tilegrid.TileGrid}
+ * @param {olx.tilegrid.WMTSOptions} options WMTS options.
+ * @struct
+ * @api
+ */
+ol.tilegrid.WMTS = function(options) {
+
+  goog.asserts.assert(
+      options.resolutions.length == options.matrixIds.length,
+      'options resolutions and matrixIds must have equal length (%s == %s)',
+      options.resolutions.length, options.matrixIds.length);
+
+  /**
+   * @private
+   * @type {!Array.<string>}
+   */
+  this.matrixIds_ = options.matrixIds;
+  // FIXME: should the matrixIds become optionnal?
+
+  goog.base(this, {
+    extent: options.extent,
+    origin: options.origin,
+    origins: options.origins,
+    resolutions: options.resolutions,
+    tileSize: options.tileSize,
+    tileSizes: options.tileSizes,
+    sizes: options.sizes
+  });
+
+};
+goog.inherits(ol.tilegrid.WMTS, ol.tilegrid.TileGrid);
+
+
+/**
+ * @param {number} z Z.
+ * @return {string} MatrixId..
+ */
+ol.tilegrid.WMTS.prototype.getMatrixId = function(z) {
+  goog.asserts.assert(0 <= z && z < this.matrixIds_.length,
+      'attempted to retrive matrixId for illegal z (%s)', z);
+  return this.matrixIds_[z];
+};
+
+
+/**
+ * Get the list of matrix identifiers.
+ * @return {Array.<string>} MatrixIds.
+ * @api
+ */
+ol.tilegrid.WMTS.prototype.getMatrixIds = function() {
+  return this.matrixIds_;
+};
+
+
+/**
+ * Create a tile grid from a WMTS capabilities matrix set.
+ * @param {Object} matrixSet An object representing a matrixSet in the
+ *     capabilities document.
+ * @param {ol.Extent=} opt_extent An optional extent to restrict the tile
+ *     ranges the server provides.
+ * @return {ol.tilegrid.WMTS} WMTS tileGrid instance.
+ * @api
+ */
+ol.tilegrid.WMTS.createFromCapabilitiesMatrixSet =
+    function(matrixSet, opt_extent) {
+
+  /** @type {!Array.<number>} */
+  var resolutions = [];
+  /** @type {!Array.<string>} */
+  var matrixIds = [];
+  /** @type {!Array.<ol.Coordinate>} */
+  var origins = [];
+  /** @type {!Array.<ol.Size>} */
+  var tileSizes = [];
+  /** @type {!Array.<ol.Size>} */
+  var sizes = [];
+
+  var supportedCRSPropName = 'SupportedCRS';
+  var matrixIdsPropName = 'TileMatrix';
+  var identifierPropName = 'Identifier';
+  var scaleDenominatorPropName = 'ScaleDenominator';
+  var topLeftCornerPropName = 'TopLeftCorner';
+  var tileWidthPropName = 'TileWidth';
+  var tileHeightPropName = 'TileHeight';
+
+  var projection;
+  projection = ol.proj.get(matrixSet[supportedCRSPropName].replace(
+      /urn:ogc:def:crs:(\w+):(.*:)?(\w+)$/, '$1:$3'));
+  var metersPerUnit = projection.getMetersPerUnit();
+  // swap origin x and y coordinates if axis orientation is lat/long
+  var switchOriginXY = projection.getAxisOrientation().substr(0, 2) == 'ne';
+
+  matrixSet[matrixIdsPropName].sort(function(a, b) {
+    return b[scaleDenominatorPropName] - a[scaleDenominatorPropName];
+  });
+
+  matrixSet[matrixIdsPropName].forEach(function(elt, index, array) {
+    matrixIds.push(elt[identifierPropName]);
+    var resolution = elt[scaleDenominatorPropName] * 0.28E-3 / metersPerUnit;
+    var tileWidth = elt[tileWidthPropName];
+    var tileHeight = elt[tileHeightPropName];
+    if (switchOriginXY) {
+      origins.push([elt[topLeftCornerPropName][1],
+        elt[topLeftCornerPropName][0]]);
+    } else {
+      origins.push(elt[topLeftCornerPropName]);
+    }
+    resolutions.push(resolution);
+    tileSizes.push(tileWidth == tileHeight ?
+        tileWidth : [tileWidth, tileHeight]);
+    // top-left origin, so height is negative
+    sizes.push([elt['MatrixWidth'], -elt['MatrixHeight']]);
+  });
+
+  return new ol.tilegrid.WMTS({
+    extent: opt_extent,
+    origins: origins,
+    resolutions: resolutions,
+    matrixIds: matrixIds,
+    tileSizes: tileSizes,
+    sizes: sizes
+  });
+};
+
+goog.provide('ol.source.WMTS');
+goog.provide('ol.source.WMTSRequestEncoding');
+
+goog.require('goog.array');
+goog.require('goog.asserts');
+goog.require('goog.object');
+goog.require('goog.uri.utils');
+goog.require('ol.TileUrlFunction');
+goog.require('ol.TileUrlFunctionType');
+goog.require('ol.array');
+goog.require('ol.extent');
+goog.require('ol.proj');
+goog.require('ol.source.TileImage');
+goog.require('ol.tilegrid.WMTS');
+
+
+/**
+ * Request encoding. One of 'KVP', 'REST'.
+ * @enum {string}
+ * @api
+ */
+ol.source.WMTSRequestEncoding = {
+  KVP: 'KVP',  // see spec §8
+  REST: 'REST' // see spec §10
+};
+
+
+
+/**
+ * @classdesc
+ * Layer source for tile data from WMTS servers.
+ *
+ * @constructor
+ * @extends {ol.source.TileImage}
+ * @param {olx.source.WMTSOptions} options WMTS options.
+ * @api stable
+ */
+ol.source.WMTS = function(options) {
+
+  // TODO: add support for TileMatrixLimits
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.version_ = options.version !== undefined ? options.version : '1.0.0';
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.format_ = options.format !== undefined ? options.format : 'image/jpeg';
+
+  /**
+   * @private
+   * @type {!Object}
+   */
+  this.dimensions_ = options.dimensions !== undefined ? options.dimensions : {};
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.dimensionsKey_ = '';
+  this.resetDimensionsKey_();
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.layer_ = options.layer;
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.matrixSet_ = options.matrixSet;
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.style_ = options.style;
+
+  var urls = options.urls;
+  if (urls === undefined && options.url !== undefined) {
+    urls = ol.TileUrlFunction.expandUrl(options.url);
+  }
+
+  // FIXME: should we guess this requestEncoding from options.url(s)
+  //        structure? that would mean KVP only if a template is not provided.
+
+  /**
+   * @private
+   * @type {ol.source.WMTSRequestEncoding}
+   */
+  this.requestEncoding_ = options.requestEncoding !== undefined ?
+      /** @type {ol.source.WMTSRequestEncoding} */ (options.requestEncoding) :
+      ol.source.WMTSRequestEncoding.KVP;
+
+  var requestEncoding = this.requestEncoding_;
+
+  // FIXME: should we create a default tileGrid?
+  // we could issue a getCapabilities xhr to retrieve missing configuration
+  var tileGrid = options.tileGrid;
+
+  // context property names are lower case to allow for a case insensitive
+  // replacement as some services use different naming conventions
+  var context = {
+    'layer': this.layer_,
+    'style': this.style_,
+    'tilematrixset': this.matrixSet_
+  };
+
+  if (requestEncoding == ol.source.WMTSRequestEncoding.KVP) {
+    goog.object.extend(context, {
+      'Service': 'WMTS',
+      'Request': 'GetTile',
+      'Version': this.version_,
+      'Format': this.format_
+    });
+  }
+
+  var dimensions = this.dimensions_;
+
+  /**
+   * @param {string} template Template.
+   * @return {ol.TileUrlFunctionType} Tile URL function.
+   */
+  function createFromWMTSTemplate(template) {
+
+    // TODO: we may want to create our own appendParams function so that params
+    // order conforms to wmts spec guidance, and so that we can avoid to escape
+    // special template params
+
+    template = (requestEncoding == ol.source.WMTSRequestEncoding.KVP) ?
+        goog.uri.utils.appendParamsFromMap(template, context) :
+        template.replace(/\{(\w+?)\}/g, function(m, p) {
+          return (p.toLowerCase() in context) ? context[p.toLowerCase()] : m;
+        });
+
+    return (
+        /**
+         * @param {ol.TileCoord} tileCoord Tile coordinate.
+         * @param {number} pixelRatio Pixel ratio.
+         * @param {ol.proj.Projection} projection Projection.
+         * @return {string|undefined} Tile URL.
+         */
+        function(tileCoord, pixelRatio, projection) {
+          if (!tileCoord) {
+            return undefined;
+          } else {
+            var localContext = {
+              'TileMatrix': tileGrid.getMatrixId(tileCoord[0]),
+              'TileCol': tileCoord[1],
+              'TileRow': -tileCoord[2] - 1
+            };
+            goog.object.extend(localContext, dimensions);
+            var url = template;
+            if (requestEncoding == ol.source.WMTSRequestEncoding.KVP) {
+              url = goog.uri.utils.appendParamsFromMap(url, localContext);
+            } else {
+              url = url.replace(/\{(\w+?)\}/g, function(m, p) {
+                return localContext[p];
+              });
+            }
+            return url;
+          }
+        });
+  }
+
+  var tileUrlFunction = (urls && urls.length > 0) ?
+      ol.TileUrlFunction.createFromTileUrlFunctions(
+          urls.map(createFromWMTSTemplate)) :
+      ol.TileUrlFunction.nullTileUrlFunction;
+
+  goog.base(this, {
+    attributions: options.attributions,
+    crossOrigin: options.crossOrigin,
+    logo: options.logo,
+    projection: options.projection,
+    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
+    tileClass: options.tileClass,
+    tileGrid: tileGrid,
+    tileLoadFunction: options.tileLoadFunction,
+    tilePixelRatio: options.tilePixelRatio,
+    tileUrlFunction: tileUrlFunction,
+    urls: urls,
+    wrapX: options.wrapX !== undefined ? options.wrapX : false
+  });
+
+};
+goog.inherits(ol.source.WMTS, ol.source.TileImage);
+
+
+/**
+ * Get the dimensions, i.e. those passed to the constructor through the
+ * "dimensions" option, and possibly updated using the updateDimensions
+ * method.
+ * @return {!Object} Dimensions.
+ * @api
+ */
+ol.source.WMTS.prototype.getDimensions = function() {
+  return this.dimensions_;
+};
+
+
+/**
+ * Return the image format of the WMTS source.
+ * @return {string} Format.
+ * @api
+ */
+ol.source.WMTS.prototype.getFormat = function() {
+  return this.format_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.WMTS.prototype.getKeyParams = function() {
+  return this.dimensionsKey_;
+};
+
+
+/**
+ * Return the layer of the WMTS source.
+ * @return {string} Layer.
+ * @api
+ */
+ol.source.WMTS.prototype.getLayer = function() {
+  return this.layer_;
+};
+
+
+/**
+ * Return the matrix set of the WMTS source.
+ * @return {string} MatrixSet.
+ * @api
+ */
+ol.source.WMTS.prototype.getMatrixSet = function() {
+  return this.matrixSet_;
+};
+
+
+/**
+ * Return the request encoding, either "KVP" or "REST".
+ * @return {ol.source.WMTSRequestEncoding} Request encoding.
+ * @api
+ */
+ol.source.WMTS.prototype.getRequestEncoding = function() {
+  return this.requestEncoding_;
+};
+
+
+/**
+ * Return the style of the WMTS source.
+ * @return {string} Style.
+ * @api
+ */
+ol.source.WMTS.prototype.getStyle = function() {
+  return this.style_;
+};
+
+
+/**
+ * Return the version of the WMTS source.
+ * @return {string} Version.
+ * @api
+ */
+ol.source.WMTS.prototype.getVersion = function() {
+  return this.version_;
+};
+
+
+/**
+ * @private
+ */
+ol.source.WMTS.prototype.resetDimensionsKey_ = function() {
+  var i = 0;
+  var res = [];
+  for (var key in this.dimensions_) {
+    res[i++] = key + '-' + this.dimensions_[key];
+  }
+  this.dimensionsKey_ = res.join('/');
+};
+
+
+/**
+ * Update the dimensions.
+ * @param {Object} dimensions Dimensions.
+ * @api
+ */
+ol.source.WMTS.prototype.updateDimensions = function(dimensions) {
+  goog.object.extend(this.dimensions_, dimensions);
+  this.resetDimensionsKey_();
+  this.changed();
+};
+
+
+/**
+ * Generate source options from a capabilities object.
+ * @param {Object} wmtsCap An object representing the capabilities document.
+ * @param {Object} config Configuration properties for the layer.  Defaults for
+ *                  the layer will apply if not provided.
+ *
+ * Required config properties:
+ *  - layer - {string} The layer identifier.
+ *
+ * Optional config properties:
+ *  - matrixSet - {string} The matrix set identifier, required if there is
+ *       more than one matrix set in the layer capabilities.
+ *  - projection - {string} The desired CRS when no matrixSet is specified.
+ *       eg: "EPSG:3857". If the desired projection is not available,
+ *       an error is thrown.
+ *  - requestEncoding - {string} url encoding format for the layer. Default is
+ *       the first tile url format found in the GetCapabilities response.
+ *  - style - {string} The name of the style
+ *  - format - {string} Image format for the layer. Default is the first
+ *       format returned in the GetCapabilities response.
+ * @return {olx.source.WMTSOptions} WMTS source options object.
+ * @api
+ */
+ol.source.WMTS.optionsFromCapabilities = function(wmtsCap, config) {
+
+  // TODO: add support for TileMatrixLimits
+  goog.asserts.assert(config['layer'],
+      'config "layer" must not be null');
+
+  var layers = wmtsCap['Contents']['Layer'];
+  var l = goog.array.find(layers, function(elt, index, array) {
+    return elt['Identifier'] == config['layer'];
+  });
+  goog.asserts.assert(l, 'found a matching layer in Contents/Layer');
+
+  goog.asserts.assert(l['TileMatrixSetLink'].length > 0,
+      'layer has TileMatrixSetLink');
+  var tileMatrixSets = wmtsCap['Contents']['TileMatrixSet'];
+  var idx, matrixSet;
+  if (l['TileMatrixSetLink'].length > 1) {
+    if ('projection' in config) {
+      idx = goog.array.findIndex(l['TileMatrixSetLink'],
+          function(elt, index, array) {
+            var tileMatrixSet = goog.array.find(tileMatrixSets, function(el) {
+              return el['Identifier'] == elt['TileMatrixSet'];
+            });
+            return tileMatrixSet['SupportedCRS'].replace(
+                /urn:ogc:def:crs:(\w+):(.*:)?(\w+)$/, '$1:$3'
+                   ) == config['projection'];
+          });
+    } else {
+      idx = goog.array.findIndex(l['TileMatrixSetLink'],
+          function(elt, index, array) {
+            return elt['TileMatrixSet'] == config['matrixSet'];
+          });
+    }
+  } else {
+    idx = 0;
+  }
+  if (idx < 0) {
+    idx = 0;
+  }
+  matrixSet = /** @type {string} */
+      (l['TileMatrixSetLink'][idx]['TileMatrixSet']);
+
+  goog.asserts.assert(matrixSet, 'TileMatrixSet must not be null');
+
+  var format = /** @type {string} */ (l['Format'][0]);
+  if ('format' in config) {
+    format = config['format'];
+  }
+  idx = goog.array.findIndex(l['Style'], function(elt, index, array) {
+    if ('style' in config) {
+      return elt['Title'] == config['style'];
+    } else {
+      return elt['isDefault'];
+    }
+  });
+  if (idx < 0) {
+    idx = 0;
+  }
+  var style = /** @type {string} */ (l['Style'][idx]['Identifier']);
+
+  var dimensions = {};
+  if ('Dimension' in l) {
+    l['Dimension'].forEach(function(elt, index, array) {
+      var key = elt['Identifier'];
+      var value = elt['Default'];
+      if (value !== undefined) {
+        goog.asserts.assert(ol.array.includes(elt['Value'], value),
+            'default value contained in values');
+      } else {
+        value = elt['Value'][0];
+      }
+      goog.asserts.assert(value !== undefined, 'value could be found');
+      dimensions[key] = value;
+    });
+  }
+
+  var matrixSets = wmtsCap['Contents']['TileMatrixSet'];
+  var matrixSetObj = goog.array.find(matrixSets, function(elt, index, array) {
+    return elt['Identifier'] == matrixSet;
+  });
+  goog.asserts.assert(matrixSetObj,
+      'found matrixSet in Contents/TileMatrixSet');
+
+  var projection;
+  if ('projection' in config) {
+    projection = ol.proj.get(config['projection']);
+  } else {
+    projection = ol.proj.get(matrixSetObj['SupportedCRS'].replace(
+        /urn:ogc:def:crs:(\w+):(.*:)?(\w+)$/, '$1:$3'));
+  }
+
+  var wgs84BoundingBox = l['WGS84BoundingBox'];
+  var extent, wrapX;
+  if (wgs84BoundingBox !== undefined) {
+    var wgs84ProjectionExtent = ol.proj.get('EPSG:4326').getExtent();
+    wrapX = (wgs84BoundingBox[0] == wgs84ProjectionExtent[0] &&
+        wgs84BoundingBox[2] == wgs84ProjectionExtent[2]);
+    extent = ol.proj.transformExtent(
+        wgs84BoundingBox, 'EPSG:4326', projection);
+    var projectionExtent = projection.getExtent();
+    if (projectionExtent) {
+      // If possible, do a sanity check on the extent - it should never be
+      // bigger than the validity extent of the projection of a matrix set.
+      if (!ol.extent.containsExtent(projectionExtent, extent)) {
+        extent = undefined;
+      }
+    }
+  }
+
+  var tileGrid = ol.tilegrid.WMTS.createFromCapabilitiesMatrixSet(
+      matrixSetObj, extent);
+
+  /** @type {!Array.<string>} */
+  var urls = [];
+  var requestEncoding = config['requestEncoding'];
+  requestEncoding = requestEncoding !== undefined ? requestEncoding : '';
+
+  goog.asserts.assert(
+      ol.array.includes(['REST', 'RESTful', 'KVP', ''], requestEncoding),
+      'requestEncoding (%s) is one of "REST", "RESTful", "KVP" or ""',
+      requestEncoding);
+
+  if (!wmtsCap.hasOwnProperty('OperationsMetadata') ||
+      !wmtsCap['OperationsMetadata'].hasOwnProperty('GetTile') ||
+      requestEncoding.indexOf('REST') === 0) {
+    // Add REST tile resource url
+    requestEncoding = ol.source.WMTSRequestEncoding.REST;
+    l['ResourceURL'].forEach(function(elt, index, array) {
+      if (elt['resourceType'] == 'tile') {
+        format = elt['format'];
+        urls.push(/** @type {string} */ (elt['template']));
+      }
+    });
+  } else {
+    var gets = wmtsCap['OperationsMetadata']['GetTile']['DCP']['HTTP']['Get'];
+
+    for (var i = 0, ii = gets.length; i < ii; ++i) {
+      var constraint = goog.array.find(gets[i]['Constraint'],
+          function(elt, index, array) {
+            return elt['name'] == 'GetEncoding';
+          });
+      var encodings = constraint['AllowedValues']['Value'];
+      if (encodings.length > 0 && ol.array.includes(encodings, 'KVP')) {
+        requestEncoding = ol.source.WMTSRequestEncoding.KVP;
+        urls.push(/** @type {string} */ (gets[i]['href']));
+      }
+    }
+  }
+  goog.asserts.assert(urls.length > 0, 'At least one URL found');
+
+  return {
+    urls: urls,
+    layer: config['layer'],
+    matrixSet: matrixSet,
+    format: format,
+    projection: projection,
+    requestEncoding: requestEncoding,
+    tileGrid: tileGrid,
+    style: style,
+    dimensions: dimensions,
+    wrapX: wrapX
+  };
+
+};
+
+goog.provide('ol.source.Zoomify');
+
+goog.require('goog.asserts');
+goog.require('ol');
+goog.require('ol.ImageTile');
+goog.require('ol.TileCoord');
+goog.require('ol.TileState');
+goog.require('ol.dom');
+goog.require('ol.extent');
+goog.require('ol.proj');
+goog.require('ol.source.TileImage');
+goog.require('ol.tilegrid.TileGrid');
+
+
+/**
+ * @enum {string}
+ */
+ol.source.ZoomifyTierSizeCalculation = {
+  DEFAULT: 'default',
+  TRUNCATED: 'truncated'
+};
+
+
+
+/**
+ * @classdesc
+ * Layer source for tile data in Zoomify format.
+ *
+ * @constructor
+ * @extends {ol.source.TileImage}
+ * @param {olx.source.ZoomifyOptions=} opt_options Options.
+ * @api stable
+ */
+ol.source.Zoomify = function(opt_options) {
+
+  var options = opt_options || {};
+
+  var size = options.size;
+  var tierSizeCalculation = options.tierSizeCalculation !== undefined ?
+      options.tierSizeCalculation :
+      ol.source.ZoomifyTierSizeCalculation.DEFAULT;
+
+  var imageWidth = size[0];
+  var imageHeight = size[1];
+  var tierSizeInTiles = [];
+  var tileSize = ol.DEFAULT_TILE_SIZE;
+
+  switch (tierSizeCalculation) {
+    case ol.source.ZoomifyTierSizeCalculation.DEFAULT:
+      while (imageWidth > tileSize || imageHeight > tileSize) {
+        tierSizeInTiles.push([
+          Math.ceil(imageWidth / tileSize),
+          Math.ceil(imageHeight / tileSize)
+        ]);
+        tileSize += tileSize;
+      }
+      break;
+    case ol.source.ZoomifyTierSizeCalculation.TRUNCATED:
+      var width = imageWidth;
+      var height = imageHeight;
+      while (width > tileSize || height > tileSize) {
+        tierSizeInTiles.push([
+          Math.ceil(width / tileSize),
+          Math.ceil(height / tileSize)
+        ]);
+        width >>= 1;
+        height >>= 1;
+      }
+      break;
+    default:
+      goog.asserts.fail();
+      break;
+  }
+
+  tierSizeInTiles.push([1, 1]);
+  tierSizeInTiles.reverse();
+
+  var resolutions = [1];
+  var tileCountUpToTier = [0];
+  var i, ii;
+  for (i = 1, ii = tierSizeInTiles.length; i < ii; i++) {
+    resolutions.push(1 << i);
+    tileCountUpToTier.push(
+        tierSizeInTiles[i - 1][0] * tierSizeInTiles[i - 1][1] +
+        tileCountUpToTier[i - 1]
+    );
+  }
+  resolutions.reverse();
+
+  var extent = [0, -size[1], size[0], 0];
+  var tileGrid = new ol.tilegrid.TileGrid({
+    extent: extent,
+    origin: ol.extent.getTopLeft(extent),
+    resolutions: resolutions
+  });
+
+  var url = options.url;
+
+  /**
+   * @this {ol.source.TileImage}
+   * @param {ol.TileCoord} tileCoord Tile Coordinate.
+   * @param {number} pixelRatio Pixel ratio.
+   * @param {ol.proj.Projection} projection Projection.
+   * @return {string|undefined} Tile URL.
+   */
+  function tileUrlFunction(tileCoord, pixelRatio, projection) {
+    if (!tileCoord) {
+      return undefined;
+    } else {
+      var tileCoordZ = tileCoord[0];
+      var tileCoordX = tileCoord[1];
+      var tileCoordY = -tileCoord[2] - 1;
+      var tileIndex =
+          tileCoordX +
+          tileCoordY * tierSizeInTiles[tileCoordZ][0] +
+          tileCountUpToTier[tileCoordZ];
+      var tileGroup = (tileIndex / ol.DEFAULT_TILE_SIZE) | 0;
+      return url + 'TileGroup' + tileGroup + '/' +
+          tileCoordZ + '-' + tileCoordX + '-' + tileCoordY + '.jpg';
+    }
+  }
+
+  goog.base(this, {
+    attributions: options.attributions,
+    crossOrigin: options.crossOrigin,
+    logo: options.logo,
+    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
+    tileClass: ol.source.ZoomifyTile_,
+    tileGrid: tileGrid,
+    tileUrlFunction: tileUrlFunction
+  });
+
+};
+goog.inherits(ol.source.Zoomify, ol.source.TileImage);
+
+
+
+/**
+ * @constructor
+ * @extends {ol.ImageTile}
+ * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {ol.TileState} state State.
+ * @param {string} src Image source URI.
+ * @param {?string} crossOrigin Cross origin.
+ * @param {ol.TileLoadFunctionType} tileLoadFunction Tile load function.
+ * @private
+ */
+ol.source.ZoomifyTile_ = function(
+    tileCoord, state, src, crossOrigin, tileLoadFunction) {
+
+  goog.base(this, tileCoord, state, src, crossOrigin, tileLoadFunction);
+
+  /**
+   * @private
+   * @type {Object.<string,
+   *                HTMLCanvasElement|HTMLImageElement|HTMLVideoElement>}
+   */
+  this.zoomifyImageByContext_ = {};
+
+};
+goog.inherits(ol.source.ZoomifyTile_, ol.ImageTile);
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.ZoomifyTile_.prototype.getImage = function(opt_context) {
+  var tileSize = ol.DEFAULT_TILE_SIZE;
+  var key = opt_context !== undefined ?
+      goog.getUid(opt_context).toString() : '';
+  if (key in this.zoomifyImageByContext_) {
+    return this.zoomifyImageByContext_[key];
+  } else {
+    var image = goog.base(this, 'getImage', opt_context);
+    if (this.state == ol.TileState.LOADED) {
+      if (image.width == tileSize && image.height == tileSize) {
+        this.zoomifyImageByContext_[key] = image;
+        return image;
+      } else {
+        var context = ol.dom.createCanvasContext2D(tileSize, tileSize);
+        context.drawImage(image, 0, 0);
+        this.zoomifyImageByContext_[key] = context.canvas;
+        return context.canvas;
+      }
+    } else {
+      return image;
+    }
+  }
+};
+
+goog.provide('ol.style.Atlas');
+goog.provide('ol.style.AtlasManager');
+
+goog.require('goog.asserts');
+goog.require('goog.functions');
+goog.require('goog.object');
+goog.require('ol');
+
+
+/**
+ * Provides information for an image inside an atlas manager.
+ * `offsetX` and `offsetY` is the position of the image inside
+ * the atlas image `image` and the position of the hit-detection image
+ * inside the hit-detection atlas image `hitImage`.
+ * @typedef {{offsetX: number, offsetY: number, image: HTMLCanvasElement,
+ *    hitImage: HTMLCanvasElement}}
+ */
+ol.style.AtlasManagerInfo;
+
+
+
+/**
+ * Manages the creation of image atlases.
+ *
+ * Images added to this manager will be inserted into an atlas, which
+ * will be used for rendering.
+ * The `size` given in the constructor is the size for the first
+ * atlas. After that, when new atlases are created, they will have
+ * twice the size as the latest atlas (until `maxSize` is reached).
+ *
+ * If an application uses many images or very large images, it is recommended
+ * to set a higher `size` value to avoid the creation of too many atlases.
+ *
+ * @constructor
+ * @struct
+ * @api
+ * @param {olx.style.AtlasManagerOptions=} opt_options Options.
+ */
+ol.style.AtlasManager = function(opt_options) {
+
+  var options = opt_options || {};
+
+  /**
+   * The size in pixels of the latest atlas image.
+   * @private
+   * @type {number}
+   */
+  this.currentSize_ = options.initialSize !== undefined ?
+      options.initialSize : ol.INITIAL_ATLAS_SIZE;
+
+  /**
+   * The maximum size in pixels of atlas images.
+   * @private
+   * @type {number}
+   */
+  this.maxSize_ = options.maxSize !== undefined ?
+      options.maxSize : ol.MAX_ATLAS_SIZE != -1 ?
+          ol.MAX_ATLAS_SIZE : ol.WEBGL_MAX_TEXTURE_SIZE !== undefined ?
+              ol.WEBGL_MAX_TEXTURE_SIZE : 2048;
+
+  /**
+   * The size in pixels between images.
+   * @private
+   * @type {number}
+   */
+  this.space_ = options.space !== undefined ? options.space : 1;
+
+  /**
+   * @private
+   * @type {Array.<ol.style.Atlas>}
+   */
+  this.atlases_ = [new ol.style.Atlas(this.currentSize_, this.space_)];
+
+  /**
+   * The size in pixels of the latest atlas image for hit-detection images.
+   * @private
+   * @type {number}
+   */
+  this.currentHitSize_ = this.currentSize_;
+
+  /**
+   * @private
+   * @type {Array.<ol.style.Atlas>}
+   */
+  this.hitAtlases_ = [new ol.style.Atlas(this.currentHitSize_, this.space_)];
+};
+
+
+/**
+ * @param {string} id The identifier of the entry to check.
+ * @return {?ol.style.AtlasManagerInfo} The position and atlas image for the
+ *    entry, or `null` if the entry is not part of the atlas manager.
+ */
+ol.style.AtlasManager.prototype.getInfo = function(id) {
+  /** @type {?ol.style.AtlasInfo} */
+  var info = this.getInfo_(this.atlases_, id);
+
+  if (!info) {
+    return null;
+  }
+  /** @type {?ol.style.AtlasInfo} */
+  var hitInfo = this.getInfo_(this.hitAtlases_, id);
+  goog.asserts.assert(hitInfo, 'hitInfo must not be null');
+
+  return this.mergeInfos_(info, hitInfo);
+};
+
+
+/**
+ * @private
+ * @param {Array.<ol.style.Atlas>} atlases The atlases to search.
+ * @param {string} id The identifier of the entry to check.
+ * @return {?ol.style.AtlasInfo} The position and atlas image for the entry,
+ *    or `null` if the entry is not part of the atlases.
+ */
+ol.style.AtlasManager.prototype.getInfo_ = function(atlases, id) {
+  var atlas, info, i, ii;
+  for (i = 0, ii = atlases.length; i < ii; ++i) {
+    atlas = atlases[i];
+    info = atlas.get(id);
+    if (info) {
+      return info;
+    }
+  }
+  return null;
+};
+
+
+/**
+ * @private
+ * @param {ol.style.AtlasInfo} info The info for the real image.
+ * @param {ol.style.AtlasInfo} hitInfo The info for the hit-detection
+ *    image.
+ * @return {?ol.style.AtlasManagerInfo} The position and atlas image for the
+ *    entry, or `null` if the entry is not part of the atlases.
+ */
+ol.style.AtlasManager.prototype.mergeInfos_ = function(info, hitInfo) {
+  goog.asserts.assert(info.offsetX === hitInfo.offsetX,
+      'in order to merge, offsetX of info and hitInfo must be equal');
+  goog.asserts.assert(info.offsetY === hitInfo.offsetY,
+      'in order to merge, offsetY of info and hitInfo must be equal');
+  return /** @type {ol.style.AtlasManagerInfo} */ ({
+    offsetX: info.offsetX,
+    offsetY: info.offsetY,
+    image: info.image,
+    hitImage: hitInfo.image
+  });
+};
+
+
+/**
+ * Add an image to the atlas manager.
+ *
+ * If an entry for the given id already exists, the entry will
+ * be overridden (but the space on the atlas graphic will not be freed).
+ *
+ * If `renderHitCallback` is provided, the image (or the hit-detection version
+ * of the image) will be rendered into a separate hit-detection atlas image.
+ *
+ * @param {string} id The identifier of the entry to add.
+ * @param {number} width The width.
+ * @param {number} height The height.
+ * @param {function(CanvasRenderingContext2D, number, number)} renderCallback
+ *    Called to render the new image onto an atlas image.
+ * @param {function(CanvasRenderingContext2D, number, number)=}
+ *    opt_renderHitCallback Called to render a hit-detection image onto a hit
+ *    detection atlas image.
+ * @param {Object=} opt_this Value to use as `this` when executing
+ *    `renderCallback` and `renderHitCallback`.
+ * @return {?ol.style.AtlasManagerInfo}  The position and atlas image for the
+ *    entry, or `null` if the image is too big.
+ */
+ol.style.AtlasManager.prototype.add =
+    function(id, width, height,
+        renderCallback, opt_renderHitCallback, opt_this) {
+  if (width + this.space_ > this.maxSize_ ||
+      height + this.space_ > this.maxSize_) {
+    return null;
+  }
+
+  /** @type {?ol.style.AtlasInfo} */
+  var info = this.add_(false,
+      id, width, height, renderCallback, opt_this);
+  if (!info) {
+    return null;
+  }
+
+  // even if no hit-detection entry is requested, we insert a fake entry into
+  // the hit-detection atlas, to make sure that the offset is the same for
+  // the original image and the hit-detection image.
+  var renderHitCallback = opt_renderHitCallback !== undefined ?
+      opt_renderHitCallback : goog.functions.NULL;
+
+  /** @type {?ol.style.AtlasInfo} */
+  var hitInfo = this.add_(true,
+      id, width, height, renderHitCallback, opt_this);
+  goog.asserts.assert(hitInfo, 'hitInfo must not be null');
+
+  return this.mergeInfos_(info, hitInfo);
+};
+
+
+/**
+ * @private
+ * @param {boolean} isHitAtlas If the hit-detection atlases are used.
+ * @param {string} id The identifier of the entry to add.
+ * @param {number} width The width.
+ * @param {number} height The height.
+ * @param {function(CanvasRenderingContext2D, number, number)} renderCallback
+ *    Called to render the new image onto an atlas image.
+ * @param {Object=} opt_this Value to use as `this` when executing
+ *    `renderCallback` and `renderHitCallback`.
+ * @return {?ol.style.AtlasInfo}  The position and atlas image for the entry,
+ *    or `null` if the image is too big.
+ */
+ol.style.AtlasManager.prototype.add_ =
+    function(isHitAtlas, id, width, height,
+        renderCallback, opt_this) {
+  var atlases = (isHitAtlas) ? this.hitAtlases_ : this.atlases_;
+  var atlas, info, i, ii;
+  for (i = 0, ii = atlases.length; i < ii; ++i) {
+    atlas = atlases[i];
+    info = atlas.add(id, width, height, renderCallback, opt_this);
+    if (info) {
+      return info;
+    } else if (!info && i === ii - 1) {
+      // the entry could not be added to one of the existing atlases,
+      // create a new atlas that is twice as big and try to add to this one.
+      var size;
+      if (isHitAtlas) {
+        size = Math.min(this.currentHitSize_ * 2, this.maxSize_);
+        this.currentHitSize_ = size;
+      } else {
+        size = Math.min(this.currentSize_ * 2, this.maxSize_);
+        this.currentSize_ = size;
+      }
+      atlas = new ol.style.Atlas(size, this.space_);
+      atlases.push(atlas);
+      // run the loop another time
+      ++ii;
+    }
+  }
+  goog.asserts.fail('Failed to add to atlasmanager');
+};
+
+
+/**
+ * Provides information for an image inside an atlas.
+ * `offsetX` and `offsetY` are the position of the image inside
+ * the atlas image `image`.
+ * @typedef {{offsetX: number, offsetY: number, image: HTMLCanvasElement}}
+ */
+ol.style.AtlasInfo;
+
+
+
+/**
+ * This class facilitates the creation of image atlases.
+ *
+ * Images added to an atlas will be rendered onto a single
+ * atlas canvas. The distribution of images on the canvas is
+ * managed with the bin packing algorithm described in:
+ * http://www.blackpawn.com/texts/lightmaps/
+ *
+ * @constructor
+ * @struct
+ * @param {number} size The size in pixels of the sprite image.
+ * @param {number} space The space in pixels between images.
+ *    Because texture coordinates are float values, the edges of
+ *    images might not be completely correct (in a way that the
+ *    edges overlap when being rendered). To avoid this we add a
+ *    padding around each image.
+ */
+ol.style.Atlas = function(size, space) {
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.space_ = space;
+
+  /**
+   * @private
+   * @type {Array.<ol.style.Atlas.Block>}
+   */
+  this.emptyBlocks_ = [{x: 0, y: 0, width: size, height: size}];
+
+  /**
+   * @private
+   * @type {Object.<string, ol.style.AtlasInfo>}
+   */
+  this.entries_ = {};
+
+  /**
+   * @private
+   * @type {HTMLCanvasElement}
+   */
+  this.canvas_ = /** @type {HTMLCanvasElement} */
+      (document.createElement('CANVAS'));
+  this.canvas_.width = size;
+  this.canvas_.height = size;
+
+  /**
+   * @private
+   * @type {CanvasRenderingContext2D}
+   */
+  this.context_ = /** @type {CanvasRenderingContext2D} */
+      (this.canvas_.getContext('2d'));
+};
+
+
+/**
+ * @param {string} id The identifier of the entry to check.
+ * @return {?ol.style.AtlasInfo}
+ */
+ol.style.Atlas.prototype.get = function(id) {
+  return /** @type {?ol.style.AtlasInfo} */ (
+      goog.object.get(this.entries_, id, null));
+};
+
+
+/**
+ * @param {string} id The identifier of the entry to add.
+ * @param {number} width The width.
+ * @param {number} height The height.
+ * @param {function(CanvasRenderingContext2D, number, number)} renderCallback
+ *    Called to render the new image onto an atlas image.
+ * @param {Object=} opt_this Value to use as `this` when executing
+ *    `renderCallback`.
+ * @return {?ol.style.AtlasInfo} The position and atlas image for the entry.
+ */
+ol.style.Atlas.prototype.add =
+    function(id, width, height, renderCallback, opt_this) {
+  var block, i, ii;
+  for (i = 0, ii = this.emptyBlocks_.length; i < ii; ++i) {
+    block = this.emptyBlocks_[i];
+    if (block.width >= width + this.space_ &&
+        block.height >= height + this.space_) {
+      // we found a block that is big enough for our entry
+      var entry = {
+        offsetX: block.x + this.space_,
+        offsetY: block.y + this.space_,
+        image: this.canvas_
+      };
+      this.entries_[id] = entry;
+
+      // render the image on the atlas image
+      renderCallback.call(opt_this, this.context_,
+          block.x + this.space_, block.y + this.space_);
+
+      // split the block after the insertion, either horizontally or vertically
+      this.split_(i, block, width + this.space_, height + this.space_);
+
+      return entry;
+    }
+  }
+
+  // there is no space for the new entry in this atlas
+  return null;
+};
+
+
+/**
+ * @private
+ * @param {number} index The index of the block.
+ * @param {ol.style.Atlas.Block} block The block to split.
+ * @param {number} width The width of the entry to insert.
+ * @param {number} height The height of the entry to insert.
+ */
+ol.style.Atlas.prototype.split_ =
+    function(index, block, width, height) {
+  var deltaWidth = block.width - width;
+  var deltaHeight = block.height - height;
+
+  /** @type {ol.style.Atlas.Block} */
+  var newBlock1;
+  /** @type {ol.style.Atlas.Block} */
+  var newBlock2;
+
+  if (deltaWidth > deltaHeight) {
+    // split vertically
+    // block right of the inserted entry
+    newBlock1 = {
+      x: block.x + width,
+      y: block.y,
+      width: block.width - width,
+      height: block.height
+    };
+
+    // block below the inserted entry
+    newBlock2 = {
+      x: block.x,
+      y: block.y + height,
+      width: width,
+      height: block.height - height
+    };
+    this.updateBlocks_(index, newBlock1, newBlock2);
+  } else {
+    // split horizontally
+    // block right of the inserted entry
+    newBlock1 = {
+      x: block.x + width,
+      y: block.y,
+      width: block.width - width,
+      height: height
+    };
+
+    // block below the inserted entry
+    newBlock2 = {
+      x: block.x,
+      y: block.y + height,
+      width: block.width,
+      height: block.height - height
+    };
+    this.updateBlocks_(index, newBlock1, newBlock2);
+  }
+};
+
+
+/**
+ * Remove the old block and insert new blocks at the same array position.
+ * The new blocks are inserted at the same position, so that splitted
+ * blocks (that are potentially smaller) are filled first.
+ * @private
+ * @param {number} index The index of the block to remove.
+ * @param {ol.style.Atlas.Block} newBlock1 The 1st block to add.
+ * @param {ol.style.Atlas.Block} newBlock2 The 2nd block to add.
+ */
+ol.style.Atlas.prototype.updateBlocks_ =
+    function(index, newBlock1, newBlock2) {
+  var args = [index, 1];
+  if (newBlock1.width > 0 && newBlock1.height > 0) {
+    args.push(newBlock1);
+  }
+  if (newBlock2.width > 0 && newBlock2.height > 0) {
+    args.push(newBlock2);
+  }
+  this.emptyBlocks_.splice.apply(this.emptyBlocks_, args);
+};
+
+
+/**
+ * @typedef {{x: number, y: number, width: number, height: number}}
+ */
+ol.style.Atlas.Block;
+
+goog.provide('ol.style.RegularShape');
+
+goog.require('goog.asserts');
+goog.require('ol');
+goog.require('ol.color');
+goog.require('ol.has');
+goog.require('ol.render.canvas');
+goog.require('ol.structs.IHasChecksum');
+goog.require('ol.style.AtlasManager');
+goog.require('ol.style.Fill');
+goog.require('ol.style.Image');
+goog.require('ol.style.ImageState');
+goog.require('ol.style.Stroke');
+
+
+
+/**
+ * @classdesc
+ * Set regular shape style for vector features. The resulting shape will be
+ * a regular polygon when `radius` is provided, or a star when `radius1` and
+ * `radius2` are provided.
+ *
+ * @constructor
+ * @param {olx.style.RegularShapeOptions} options Options.
+ * @extends {ol.style.Image}
+ * @implements {ol.structs.IHasChecksum}
+ * @api
+ */
+ol.style.RegularShape = function(options) {
+
+  goog.asserts.assert(
+      options.radius !== undefined || options.radius1 !== undefined,
+      'must provide either "radius" or "radius1"');
+
+  /**
+   * @private
+   * @type {Array.<string>}
+   */
+  this.checksums_ = null;
+
+  /**
+   * @private
+   * @type {HTMLCanvasElement}
+   */
+  this.canvas_ = null;
+
+  /**
+   * @private
+   * @type {HTMLCanvasElement}
+   */
+  this.hitDetectionCanvas_ = null;
+
+  /**
+   * @private
+   * @type {ol.style.Fill}
+   */
+  this.fill_ = options.fill !== undefined ? options.fill : null;
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.origin_ = [0, 0];
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.points_ = options.points;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.radius_ = /** @type {number} */ (options.radius !== undefined ?
+      options.radius : options.radius1);
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.radius2_ =
+      options.radius2 !== undefined ? options.radius2 : this.radius_;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.angle_ = options.angle !== undefined ? options.angle : 0;
+
+  /**
+   * @private
+   * @type {ol.style.Stroke}
+   */
+  this.stroke_ = options.stroke !== undefined ? options.stroke : null;
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.anchor_ = null;
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.size_ = null;
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.imageSize_ = null;
+
+  /**
+   * @private
+   * @type {ol.Size}
+   */
+  this.hitDetectionImageSize_ = null;
+
+  this.render_(options.atlasManager);
+
+  /**
+   * @type {boolean}
+   */
+  var snapToPixel = options.snapToPixel !== undefined ?
+      options.snapToPixel : true;
+
+  goog.base(this, {
+    opacity: 1,
+    rotateWithView: false,
+    rotation: options.rotation !== undefined ? options.rotation : 0,
+    scale: 1,
+    snapToPixel: snapToPixel
+  });
+
+};
+goog.inherits(ol.style.RegularShape, ol.style.Image);
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.style.RegularShape.prototype.getAnchor = function() {
+  return this.anchor_;
+};
+
+
+/**
+ * Get the angle used in generating the shape.
+ * @return {number} Shape's rotation in radians.
+ * @api
+ */
+ol.style.RegularShape.prototype.getAngle = function() {
+  return this.angle_;
+};
+
+
+/**
+ * Get the fill style for the shape.
+ * @return {ol.style.Fill} Fill style.
+ * @api
+ */
+ol.style.RegularShape.prototype.getFill = function() {
+  return this.fill_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.RegularShape.prototype.getHitDetectionImage = function(pixelRatio) {
+  return this.hitDetectionCanvas_;
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.style.RegularShape.prototype.getImage = function(pixelRatio) {
+  return this.canvas_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.RegularShape.prototype.getImageSize = function() {
+  return this.imageSize_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.RegularShape.prototype.getHitDetectionImageSize = function() {
+  return this.hitDetectionImageSize_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.RegularShape.prototype.getImageState = function() {
+  return ol.style.ImageState.LOADED;
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.style.RegularShape.prototype.getOrigin = function() {
+  return this.origin_;
+};
+
+
+/**
+ * Get the number of points for generating the shape.
+ * @return {number} Number of points for stars and regular polygons.
+ * @api
+ */
+ol.style.RegularShape.prototype.getPoints = function() {
+  return this.points_;
+};
+
+
+/**
+ * Get the (primary) radius for the shape.
+ * @return {number} Radius.
+ * @api
+ */
+ol.style.RegularShape.prototype.getRadius = function() {
+  return this.radius_;
+};
+
+
+/**
+ * Get the secondary radius for the shape.
+ * @return {number} Radius2.
+ * @api
+ */
+ol.style.RegularShape.prototype.getRadius2 = function() {
+  return this.radius2_;
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.style.RegularShape.prototype.getSize = function() {
+  return this.size_;
+};
+
+
+/**
+ * Get the stroke style for the shape.
+ * @return {ol.style.Stroke} Stroke style.
+ * @api
+ */
+ol.style.RegularShape.prototype.getStroke = function() {
+  return this.stroke_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.RegularShape.prototype.listenImageChange = ol.nullFunction;
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.RegularShape.prototype.load = ol.nullFunction;
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.RegularShape.prototype.unlistenImageChange = ol.nullFunction;
+
+
+/**
+ * @typedef {{
+ *   strokeStyle: (string|undefined),
+ *   strokeWidth: number,
+ *   size: number,
+ *   lineCap: string,
+ *   lineDash: Array.<number>,
+ *   lineJoin: string,
+ *   miterLimit: number
+ * }}
+ */
+ol.style.RegularShape.RenderOptions;
+
+
+/**
+ * @private
+ * @param {ol.style.AtlasManager|undefined} atlasManager
+ */
+ol.style.RegularShape.prototype.render_ = function(atlasManager) {
+  var imageSize;
+  var lineCap = '';
+  var lineJoin = '';
+  var miterLimit = 0;
+  var lineDash = null;
+  var strokeStyle;
+  var strokeWidth = 0;
+
+  if (this.stroke_) {
+    strokeStyle = ol.color.asString(this.stroke_.getColor());
+    strokeWidth = this.stroke_.getWidth();
+    if (strokeWidth === undefined) {
+      strokeWidth = ol.render.canvas.defaultLineWidth;
+    }
+    lineDash = this.stroke_.getLineDash();
+    if (!ol.has.CANVAS_LINE_DASH) {
+      lineDash = null;
+    }
+    lineJoin = this.stroke_.getLineJoin();
+    if (lineJoin === undefined) {
+      lineJoin = ol.render.canvas.defaultLineJoin;
+    }
+    lineCap = this.stroke_.getLineCap();
+    if (lineCap === undefined) {
+      lineCap = ol.render.canvas.defaultLineCap;
+    }
+    miterLimit = this.stroke_.getMiterLimit();
+    if (miterLimit === undefined) {
+      miterLimit = ol.render.canvas.defaultMiterLimit;
+    }
+  }
+
+  var size = 2 * (this.radius_ + strokeWidth) + 1;
+
+  /** @type {ol.style.RegularShape.RenderOptions} */
+  var renderOptions = {
+    strokeStyle: strokeStyle,
+    strokeWidth: strokeWidth,
+    size: size,
+    lineCap: lineCap,
+    lineDash: lineDash,
+    lineJoin: lineJoin,
+    miterLimit: miterLimit
+  };
+
+  if (atlasManager === undefined) {
+    // no atlas manager is used, create a new canvas
+    this.canvas_ = /** @type {HTMLCanvasElement} */
+        (document.createElement('CANVAS'));
+
+    this.canvas_.height = size;
+    this.canvas_.width = size;
+
+    // canvas.width and height are rounded to the closest integer
+    size = this.canvas_.width;
+    imageSize = size;
+
+    var context = /** @type {CanvasRenderingContext2D} */
+        (this.canvas_.getContext('2d'));
+    this.draw_(renderOptions, context, 0, 0);
+
+    this.createHitDetectionCanvas_(renderOptions);
+  } else {
+    // an atlas manager is used, add the symbol to an atlas
+    size = Math.round(size);
+
+    var hasCustomHitDetectionImage = !this.fill_;
+    var renderHitDetectionCallback;
+    if (hasCustomHitDetectionImage) {
+      // render the hit-detection image into a separate atlas image
+      renderHitDetectionCallback =
+          goog.bind(this.drawHitDetectionCanvas_, this, renderOptions);
+    }
+
+    var id = this.getChecksum();
+    var info = atlasManager.add(
+        id, size, size, goog.bind(this.draw_, this, renderOptions),
+        renderHitDetectionCallback);
+    goog.asserts.assert(info, 'shape size is too large');
+
+    this.canvas_ = info.image;
+    this.origin_ = [info.offsetX, info.offsetY];
+    imageSize = info.image.width;
+
+    if (hasCustomHitDetectionImage) {
+      this.hitDetectionCanvas_ = info.hitImage;
+      this.hitDetectionImageSize_ =
+          [info.hitImage.width, info.hitImage.height];
+    } else {
+      this.hitDetectionCanvas_ = this.canvas_;
+      this.hitDetectionImageSize_ = [imageSize, imageSize];
+    }
+  }
+
+  this.anchor_ = [size / 2, size / 2];
+  this.size_ = [size, size];
+  this.imageSize_ = [imageSize, imageSize];
+};
+
+
+/**
+ * @private
+ * @param {ol.style.RegularShape.RenderOptions} renderOptions
+ * @param {CanvasRenderingContext2D} context
+ * @param {number} x The origin for the symbol (x).
+ * @param {number} y The origin for the symbol (y).
+ */
+ol.style.RegularShape.prototype.draw_ = function(renderOptions, context, x, y) {
+  var i, angle0, radiusC;
+  // reset transform
+  context.setTransform(1, 0, 0, 1, 0, 0);
+
+  // then move to (x, y)
+  context.translate(x, y);
+
+  context.beginPath();
+  if (this.radius2_ !== this.radius_) {
+    this.points_ = 2 * this.points_;
+  }
+  for (i = 0; i <= this.points_; i++) {
+    angle0 = i * 2 * Math.PI / this.points_ - Math.PI / 2 + this.angle_;
+    radiusC = i % 2 === 0 ? this.radius_ : this.radius2_;
+    context.lineTo(renderOptions.size / 2 + radiusC * Math.cos(angle0),
+                   renderOptions.size / 2 + radiusC * Math.sin(angle0));
+  }
+
+  if (this.fill_) {
+    context.fillStyle = ol.color.asString(this.fill_.getColor());
+    context.fill();
+  }
+  if (this.stroke_) {
+    context.strokeStyle = renderOptions.strokeStyle;
+    context.lineWidth = renderOptions.strokeWidth;
+    if (renderOptions.lineDash) {
+      context.setLineDash(renderOptions.lineDash);
+    }
+    context.lineCap = renderOptions.lineCap;
+    context.lineJoin = renderOptions.lineJoin;
+    context.miterLimit = renderOptions.miterLimit;
+    context.stroke();
+  }
+  context.closePath();
+};
+
+
+/**
+ * @private
+ * @param {ol.style.RegularShape.RenderOptions} renderOptions
+ */
+ol.style.RegularShape.prototype.createHitDetectionCanvas_ =
+    function(renderOptions) {
+  this.hitDetectionImageSize_ = [renderOptions.size, renderOptions.size];
+  if (this.fill_) {
+    this.hitDetectionCanvas_ = this.canvas_;
+    return;
+  }
+
+  // if no fill style is set, create an extra hit-detection image with a
+  // default fill style
+  this.hitDetectionCanvas_ = /** @type {HTMLCanvasElement} */
+      (document.createElement('CANVAS'));
+  var canvas = this.hitDetectionCanvas_;
+
+  canvas.height = renderOptions.size;
+  canvas.width = renderOptions.size;
+
+  var context = /** @type {CanvasRenderingContext2D} */
+      (canvas.getContext('2d'));
+  this.drawHitDetectionCanvas_(renderOptions, context, 0, 0);
+};
+
+
+/**
+ * @private
+ * @param {ol.style.RegularShape.RenderOptions} renderOptions
+ * @param {CanvasRenderingContext2D} context
+ * @param {number} x The origin for the symbol (x).
+ * @param {number} y The origin for the symbol (y).
+ */
+ol.style.RegularShape.prototype.drawHitDetectionCanvas_ =
+    function(renderOptions, context, x, y) {
+  // reset transform
+  context.setTransform(1, 0, 0, 1, 0, 0);
+
+  // then move to (x, y)
+  context.translate(x, y);
+
+  context.beginPath();
+  if (this.radius2_ !== this.radius_) {
+    this.points_ = 2 * this.points_;
+  }
+  var i, radiusC, angle0;
+  for (i = 0; i <= this.points_; i++) {
+    angle0 = i * 2 * Math.PI / this.points_ - Math.PI / 2 + this.angle_;
+    radiusC = i % 2 === 0 ? this.radius_ : this.radius2_;
+    context.lineTo(renderOptions.size / 2 + radiusC * Math.cos(angle0),
+                   renderOptions.size / 2 + radiusC * Math.sin(angle0));
+  }
+
+  context.fillStyle = ol.render.canvas.defaultFillStyle;
+  context.fill();
+  if (this.stroke_) {
+    context.strokeStyle = renderOptions.strokeStyle;
+    context.lineWidth = renderOptions.strokeWidth;
+    if (renderOptions.lineDash) {
+      context.setLineDash(renderOptions.lineDash);
+    }
+    context.stroke();
+  }
+  context.closePath();
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.RegularShape.prototype.getChecksum = function() {
+  var strokeChecksum = this.stroke_ ?
+      this.stroke_.getChecksum() : '-';
+  var fillChecksum = this.fill_ ?
+      this.fill_.getChecksum() : '-';
+
+  var recalculate = !this.checksums_ ||
+      (strokeChecksum != this.checksums_[1] ||
+      fillChecksum != this.checksums_[2] ||
+      this.radius_ != this.checksums_[3] ||
+      this.radius2_ != this.checksums_[4] ||
+      this.angle_ != this.checksums_[5] ||
+      this.points_ != this.checksums_[6]);
+
+  if (recalculate) {
+    var checksum = 'r' + strokeChecksum + fillChecksum +
+        (this.radius_ !== undefined ? this.radius_.toString() : '-') +
+        (this.radius2_ !== undefined ? this.radius2_.toString() : '-') +
+        (this.angle_ !== undefined ? this.angle_.toString() : '-') +
+        (this.points_ !== undefined ? this.points_.toString() : '-');
+    this.checksums_ = [checksum, strokeChecksum, fillChecksum,
+      this.radius_, this.radius2_, this.angle_, this.points_];
+  }
+
+  return this.checksums_[0];
+};
+
+// Copyright 2009 The Closure Library Authors.
+// All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This file has been auto-generated by GenJsDeps, please do not edit.
+
+goog.addDependency('demos/editor/equationeditor.js', ['goog.demos.editor.EquationEditor'], ['goog.ui.equation.EquationEditorDialog']);
+goog.addDependency('demos/editor/helloworld.js', ['goog.demos.editor.HelloWorld'], ['goog.dom', 'goog.dom.TagName', 'goog.editor.Plugin']);
+goog.addDependency('demos/editor/helloworlddialog.js', ['goog.demos.editor.HelloWorldDialog', 'goog.demos.editor.HelloWorldDialog.OkEvent'], ['goog.dom.TagName', 'goog.events.Event', 'goog.string', 'goog.ui.editor.AbstractDialog', 'goog.ui.editor.AbstractDialog.Builder', 'goog.ui.editor.AbstractDialog.EventType']);
+goog.addDependency('demos/editor/helloworlddialogplugin.js', ['goog.demos.editor.HelloWorldDialogPlugin', 'goog.demos.editor.HelloWorldDialogPlugin.Command'], ['goog.demos.editor.HelloWorldDialog', 'goog.dom.TagName', 'goog.editor.plugins.AbstractDialogPlugin', 'goog.editor.range', 'goog.functions', 'goog.ui.editor.AbstractDialog.EventType']);
+
+/**
+ * @fileoverview Custom exports file.
+ * @suppress {checkVars,extraRequire}
+ */
+
+goog.require('ol');
+goog.require('ol.Attribution');
+goog.require('ol.Collection');
+goog.require('ol.CollectionEvent');
+goog.require('ol.CollectionEventType');
+goog.require('ol.Color');
+goog.require('ol.Coordinate');
+goog.require('ol.CoordinateFormatType');
+goog.require('ol.DeviceOrientation');
+goog.require('ol.DeviceOrientationProperty');
+goog.require('ol.DragBoxEvent');
+goog.require('ol.Extent');
+goog.require('ol.Feature');
+goog.require('ol.FeatureLoader');
+goog.require('ol.FeatureStyleFunction');
+goog.require('ol.FeatureUrlFunction');
+goog.require('ol.Geolocation');
+goog.require('ol.GeolocationProperty');
+goog.require('ol.Graticule');
+goog.require('ol.Image');
+goog.require('ol.ImageTile');
+goog.require('ol.Kinetic');
+goog.require('ol.LoadingStrategy');
+goog.require('ol.Map');
+goog.require('ol.MapBrowserEvent');
+goog.require('ol.MapBrowserEvent.EventType');
+goog.require('ol.MapBrowserEventHandler');
+goog.require('ol.MapBrowserPointerEvent');
+goog.require('ol.MapEvent');
+goog.require('ol.MapEventType');
+goog.require('ol.MapProperty');
+goog.require('ol.Object');
+goog.require('ol.ObjectEvent');
+goog.require('ol.ObjectEventType');
+goog.require('ol.Observable');
+goog.require('ol.Overlay');
+goog.require('ol.OverlayPositioning');
+goog.require('ol.OverlayProperty');
+goog.require('ol.Size');
+goog.require('ol.Sphere');
+goog.require('ol.Tile');
+goog.require('ol.TileState');
+goog.require('ol.VectorTile');
+goog.require('ol.View');
+goog.require('ol.ViewHint');
+goog.require('ol.ViewProperty');
+goog.require('ol.animation');
+goog.require('ol.color');
+goog.require('ol.control');
+goog.require('ol.control.Attribution');
+goog.require('ol.control.Control');
+goog.require('ol.control.FullScreen');
+goog.require('ol.control.MousePosition');
+goog.require('ol.control.OverviewMap');
+goog.require('ol.control.Rotate');
+goog.require('ol.control.ScaleLine');
+goog.require('ol.control.ScaleLineProperty');
+goog.require('ol.control.ScaleLineUnits');
+goog.require('ol.control.Zoom');
+goog.require('ol.control.ZoomSlider');
+goog.require('ol.control.ZoomToExtent');
+goog.require('ol.coordinate');
+goog.require('ol.easing');
+goog.require('ol.events.ConditionType');
+goog.require('ol.events.condition');
+goog.require('ol.extent');
+goog.require('ol.extent.Corner');
+goog.require('ol.extent.Relationship');
+goog.require('ol.featureloader');
+goog.require('ol.format.EsriJSON');
+goog.require('ol.format.Feature');
+goog.require('ol.format.GML');
+goog.require('ol.format.GML2');
+goog.require('ol.format.GML3');
+goog.require('ol.format.GMLBase');
+goog.require('ol.format.GPX');
+goog.require('ol.format.GeoJSON');
+goog.require('ol.format.IGC');
+goog.require('ol.format.IGCZ');
+goog.require('ol.format.KML');
+goog.require('ol.format.MVT');
+goog.require('ol.format.OSMXML');
+goog.require('ol.format.Polyline');
+goog.require('ol.format.TopoJSON');
+goog.require('ol.format.WFS');
+goog.require('ol.format.WKT');
+goog.require('ol.format.WMSCapabilities');
+goog.require('ol.format.WMSGetFeatureInfo');
+goog.require('ol.format.WMTSCapabilities');
+goog.require('ol.geom.Circle');
+goog.require('ol.geom.Geometry');
+goog.require('ol.geom.GeometryCollection');
+goog.require('ol.geom.GeometryLayout');
+goog.require('ol.geom.GeometryType');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.LinearRing');
+goog.require('ol.geom.MultiLineString');
+goog.require('ol.geom.MultiPoint');
+goog.require('ol.geom.MultiPolygon');
+goog.require('ol.geom.Point');
+goog.require('ol.geom.Polygon');
+goog.require('ol.geom.SimpleGeometry');
+goog.require('ol.has');
+goog.require('ol.interaction');
+goog.require('ol.interaction.DoubleClickZoom');
+goog.require('ol.interaction.DragAndDrop');
+goog.require('ol.interaction.DragAndDropEvent');
+goog.require('ol.interaction.DragBox');
+goog.require('ol.interaction.DragPan');
+goog.require('ol.interaction.DragRotate');
+goog.require('ol.interaction.DragRotateAndZoom');
+goog.require('ol.interaction.DragZoom');
+goog.require('ol.interaction.Draw');
+goog.require('ol.interaction.DrawEvent');
+goog.require('ol.interaction.DrawEventType');
+goog.require('ol.interaction.DrawGeometryFunctionType');
+goog.require('ol.interaction.DrawMode');
+goog.require('ol.interaction.Interaction');
+goog.require('ol.interaction.InteractionProperty');
+goog.require('ol.interaction.KeyboardPan');
+goog.require('ol.interaction.KeyboardZoom');
+goog.require('ol.interaction.Modify');
+goog.require('ol.interaction.ModifyEvent');
+goog.require('ol.interaction.MouseWheelZoom');
+goog.require('ol.interaction.PinchRotate');
+goog.require('ol.interaction.PinchZoom');
+goog.require('ol.interaction.Pointer');
+goog.require('ol.interaction.Select');
+goog.require('ol.interaction.SelectEvent');
+goog.require('ol.interaction.SelectEventType');
+goog.require('ol.interaction.SelectFilterFunction');
+goog.require('ol.interaction.Snap');
+goog.require('ol.interaction.SnapProperty');
+goog.require('ol.interaction.Translate');
+goog.require('ol.interaction.TranslateEvent');
+goog.require('ol.layer.Base');
+goog.require('ol.layer.Group');
+goog.require('ol.layer.Heatmap');
+goog.require('ol.layer.Image');
+goog.require('ol.layer.Layer');
+goog.require('ol.layer.LayerProperty');
+goog.require('ol.layer.LayerState');
+goog.require('ol.layer.Tile');
+goog.require('ol.layer.Vector');
+goog.require('ol.layer.VectorTile');
+goog.require('ol.loadingstrategy');
+goog.require('ol.proj');
+goog.require('ol.proj.METERS_PER_UNIT');
+goog.require('ol.proj.Projection');
+goog.require('ol.proj.ProjectionLike');
+goog.require('ol.proj.Units');
+goog.require('ol.proj.common');
+goog.require('ol.render');
+goog.require('ol.render.Event');
+goog.require('ol.render.EventType');
+goog.require('ol.render.Feature');
+goog.require('ol.render.VectorContext');
+goog.require('ol.render.canvas.Immediate');
+goog.require('ol.render.webgl.Immediate');
+goog.require('ol.size');
+goog.require('ol.source.BingMaps');
+goog.require('ol.source.Cluster');
+goog.require('ol.source.Image');
+goog.require('ol.source.ImageCanvas');
+goog.require('ol.source.ImageEvent');
+goog.require('ol.source.ImageMapGuide');
+goog.require('ol.source.ImageStatic');
+goog.require('ol.source.ImageVector');
+goog.require('ol.source.ImageWMS');
+goog.require('ol.source.MapQuest');
+goog.require('ol.source.OSM');
+goog.require('ol.source.Raster');
+goog.require('ol.source.RasterEvent');
+goog.require('ol.source.RasterEventType');
+goog.require('ol.source.Source');
+goog.require('ol.source.Stamen');
+goog.require('ol.source.State');
+goog.require('ol.source.Tile');
+goog.require('ol.source.TileArcGISRest');
+goog.require('ol.source.TileDebug');
+goog.require('ol.source.TileEvent');
+goog.require('ol.source.TileImage');
+goog.require('ol.source.TileJSON');
+goog.require('ol.source.TileOptions');
+goog.require('ol.source.TileUTFGrid');
+goog.require('ol.source.TileWMS');
+goog.require('ol.source.UrlTile');
+goog.require('ol.source.Vector');
+goog.require('ol.source.VectorEvent');
+goog.require('ol.source.VectorEventType');
+goog.require('ol.source.VectorTile');
+goog.require('ol.source.WMTS');
+goog.require('ol.source.WMTSRequestEncoding');
+goog.require('ol.source.XYZ');
+goog.require('ol.source.Zoomify');
+goog.require('ol.style.Atlas');
+goog.require('ol.style.AtlasManager');
+goog.require('ol.style.Circle');
+goog.require('ol.style.Fill');
+goog.require('ol.style.GeometryFunction');
+goog.require('ol.style.Icon');
+goog.require('ol.style.IconAnchorUnits');
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+    ol.control.FullScreen.prototype,
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+    ol.control.FullScreen.prototype,
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+    ol.control.FullScreen.prototype,
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+    ol.control.FullScreen.prototype,
+    'unByKey',
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+goog.exportProperty(
+    ol.control.MousePosition.prototype,
+    'getMap',
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+goog.exportProperty(
+    ol.control.MousePosition.prototype,
+    'setMap',
+    ol.control.MousePosition.prototype.setMap);
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+goog.exportProperty(
+    ol.control.MousePosition.prototype,
+    'setTarget',
+    ol.control.MousePosition.prototype.setTarget);
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+    ol.control.MousePosition.prototype,
+    'get',
+    ol.control.MousePosition.prototype.get);
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+goog.exportProperty(
+    ol.control.MousePosition.prototype,
+    'getKeys',
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+    ol.control.MousePosition.prototype,
+    'getProperties',
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+goog.exportProperty(
+    ol.control.MousePosition.prototype,
+    'set',
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+    ol.control.MousePosition.prototype,
+    'setProperties',
+    ol.control.MousePosition.prototype.setProperties);
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+goog.exportProperty(
+    ol.control.MousePosition.prototype,
+    'unset',
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+goog.exportProperty(
+    ol.control.MousePosition.prototype,
+    'changed',
+    ol.control.MousePosition.prototype.changed);
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+goog.exportProperty(
+    ol.control.MousePosition.prototype,
+    'dispatchEvent',
+    ol.control.MousePosition.prototype.dispatchEvent);
+
+goog.exportProperty(
+    ol.control.MousePosition.prototype,
+    'getRevision',
+    ol.control.MousePosition.prototype.getRevision);
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+goog.exportProperty(
+    ol.control.MousePosition.prototype,
+    'on',
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+    ol.control.MousePosition.prototype,
+    'once',
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+    ol.control.MousePosition.prototype,
+    'un',
+    ol.control.MousePosition.prototype.un);
+
+goog.exportProperty(
+    ol.control.MousePosition.prototype,
+    'unByKey',
+    ol.control.MousePosition.prototype.unByKey);
+
+goog.exportProperty(
+    ol.control.OverviewMap.prototype,
+    'getMap',
+    ol.control.OverviewMap.prototype.getMap);
+
+goog.exportProperty(
+    ol.control.OverviewMap.prototype,
+    'setMap',
+    ol.control.OverviewMap.prototype.setMap);
+
+goog.exportProperty(
+    ol.control.OverviewMap.prototype,
+    'setTarget',
+    ol.control.OverviewMap.prototype.setTarget);
+
+goog.exportProperty(
+    ol.control.OverviewMap.prototype,
+    'get',
+    ol.control.OverviewMap.prototype.get);
+
+goog.exportProperty(
+    ol.control.OverviewMap.prototype,
+    'getKeys',
+    ol.control.OverviewMap.prototype.getKeys);
+
+goog.exportProperty(
+    ol.control.OverviewMap.prototype,
+    'getProperties',
+    ol.control.OverviewMap.prototype.getProperties);
+
+goog.exportProperty(
+    ol.control.OverviewMap.prototype,
+    'set',
+    ol.control.OverviewMap.prototype.set);
+
+goog.exportProperty(
+    ol.control.OverviewMap.prototype,
+    'setProperties',
+    ol.control.OverviewMap.prototype.setProperties);
+
+goog.exportProperty(
+    ol.control.OverviewMap.prototype,
+    'unset',
+    ol.control.OverviewMap.prototype.unset);
+
+goog.exportProperty(
+    ol.control.OverviewMap.prototype,
+    'changed',
+    ol.control.OverviewMap.prototype.changed);
+
+goog.exportProperty(
+    ol.control.OverviewMap.prototype,
+    'dispatchEvent',
+    ol.control.OverviewMap.prototype.dispatchEvent);
+
+goog.exportProperty(
+    ol.control.OverviewMap.prototype,
+    'getRevision',
+    ol.control.OverviewMap.prototype.getRevision);
+
+goog.exportProperty(
+    ol.control.OverviewMap.prototype,
+    'on',
+    ol.control.OverviewMap.prototype.on);
+
+goog.exportProperty(
+    ol.control.OverviewMap.prototype,
+    'once',
+    ol.control.OverviewMap.prototype.once);
+
+goog.exportProperty(
+    ol.control.OverviewMap.prototype,
+    'un',
+    ol.control.OverviewMap.prototype.un);
+
+goog.exportProperty(
+    ol.control.OverviewMap.prototype,
+    'unByKey',
+    ol.control.OverviewMap.prototype.unByKey);
+
+goog.exportProperty(
+    ol.control.Rotate.prototype,
+    'getMap',
+    ol.control.Rotate.prototype.getMap);
+
+goog.exportProperty(
+    ol.control.Rotate.prototype,
+    'setMap',
+    ol.control.Rotate.prototype.setMap);
+
+goog.exportProperty(
+    ol.control.Rotate.prototype,
+    'setTarget',
+    ol.control.Rotate.prototype.setTarget);
+
+goog.exportProperty(
+    ol.control.Rotate.prototype,
+    'get',
+    ol.control.Rotate.prototype.get);
+
+goog.exportProperty(
+    ol.control.Rotate.prototype,
+    'getKeys',
+    ol.control.Rotate.prototype.getKeys);
+
+goog.exportProperty(
+    ol.control.Rotate.prototype,
+    'getProperties',
+    ol.control.Rotate.prototype.getProperties);
+
+goog.exportProperty(
+    ol.control.Rotate.prototype,
+    'set',
+    ol.control.Rotate.prototype.set);
+
+goog.exportProperty(
+    ol.control.Rotate.prototype,
+    'setProperties',
+    ol.control.Rotate.prototype.setProperties);
+
+goog.exportProperty(
+    ol.control.Rotate.prototype,
+    'unset',
+    ol.control.Rotate.prototype.unset);
+
+goog.exportProperty(
+    ol.control.Rotate.prototype,
+    'changed',
+    ol.control.Rotate.prototype.changed);
+
+goog.exportProperty(
+    ol.control.Rotate.prototype,
+    'dispatchEvent',
+    ol.control.Rotate.prototype.dispatchEvent);
+
+goog.exportProperty(
+    ol.control.Rotate.prototype,
+    'getRevision',
+    ol.control.Rotate.prototype.getRevision);
+
+goog.exportProperty(
+    ol.control.Rotate.prototype,
+    'on',
+    ol.control.Rotate.prototype.on);
+
+goog.exportProperty(
+    ol.control.Rotate.prototype,
+    'once',
+    ol.control.Rotate.prototype.once);
+
+goog.exportProperty(
+    ol.control.Rotate.prototype,
+    'un',
+    ol.control.Rotate.prototype.un);
+
+goog.exportProperty(
+    ol.control.Rotate.prototype,
+    'unByKey',
+    ol.control.Rotate.prototype.unByKey);
+
+goog.exportProperty(
+    ol.control.ScaleLine.prototype,
+    'getMap',
+    ol.control.ScaleLine.prototype.getMap);
+
+goog.exportProperty(
+    ol.control.ScaleLine.prototype,
+    'setMap',
+    ol.control.ScaleLine.prototype.setMap);
+
+goog.exportProperty(
+    ol.control.ScaleLine.prototype,
+    'setTarget',
+    ol.control.ScaleLine.prototype.setTarget);
+
+goog.exportProperty(
+    ol.control.ScaleLine.prototype,
+    'get',
+    ol.control.ScaleLine.prototype.get);
+
+goog.exportProperty(
+    ol.control.ScaleLine.prototype,
+    'getKeys',
+    ol.control.ScaleLine.prototype.getKeys);
+
+goog.exportProperty(
+    ol.control.ScaleLine.prototype,
+    'getProperties',
+    ol.control.ScaleLine.prototype.getProperties);
+
+goog.exportProperty(
+    ol.control.ScaleLine.prototype,
+    'set',
+    ol.control.ScaleLine.prototype.set);
+
+goog.exportProperty(
+    ol.control.ScaleLine.prototype,
+    'setProperties',
+    ol.control.ScaleLine.prototype.setProperties);
+
+goog.exportProperty(
+    ol.control.ScaleLine.prototype,
+    'unset',
+    ol.control.ScaleLine.prototype.unset);
+
+goog.exportProperty(
+    ol.control.ScaleLine.prototype,
+    'changed',
+    ol.control.ScaleLine.prototype.changed);
+
+goog.exportProperty(
+    ol.control.ScaleLine.prototype,
+    'dispatchEvent',
+    ol.control.ScaleLine.prototype.dispatchEvent);
+
+goog.exportProperty(
+    ol.control.ScaleLine.prototype,
+    'getRevision',
+    ol.control.ScaleLine.prototype.getRevision);
+
+goog.exportProperty(
+    ol.control.ScaleLine.prototype,
+    'on',
+    ol.control.ScaleLine.prototype.on);
+
+goog.exportProperty(
+    ol.control.ScaleLine.prototype,
+    'once',
+    ol.control.ScaleLine.prototype.once);
+
+goog.exportProperty(
+    ol.control.ScaleLine.prototype,
+    'un',
+    ol.control.ScaleLine.prototype.un);
+
+goog.exportProperty(
+    ol.control.ScaleLine.prototype,
+    'unByKey',
+    ol.control.ScaleLine.prototype.unByKey);
+
+goog.exportProperty(
+    ol.control.Zoom.prototype,
+    'getMap',
+    ol.control.Zoom.prototype.getMap);
+
+goog.exportProperty(
+    ol.control.Zoom.prototype,
+    'setMap',
+    ol.control.Zoom.prototype.setMap);
+
+goog.exportProperty(
+    ol.control.Zoom.prototype,
+    'setTarget',
+    ol.control.Zoom.prototype.setTarget);
+
+goog.exportProperty(
+    ol.control.Zoom.prototype,
+    'get',
+    ol.control.Zoom.prototype.get);
+
+goog.exportProperty(
+    ol.control.Zoom.prototype,
+    'getKeys',
+    ol.control.Zoom.prototype.getKeys);
+
+goog.exportProperty(
+    ol.control.Zoom.prototype,
+    'getProperties',
+    ol.control.Zoom.prototype.getProperties);
+
+goog.exportProperty(
+    ol.control.Zoom.prototype,
+    'set',
+    ol.control.Zoom.prototype.set);
+
+goog.exportProperty(
+    ol.control.Zoom.prototype,
+    'setProperties',
+    ol.control.Zoom.prototype.setProperties);
+
+goog.exportProperty(
+    ol.control.Zoom.prototype,
+    'unset',
+    ol.control.Zoom.prototype.unset);
+
+goog.exportProperty(
+    ol.control.Zoom.prototype,
+    'changed',
+    ol.control.Zoom.prototype.changed);
+
+goog.exportProperty(
+    ol.control.Zoom.prototype,
+    'dispatchEvent',
+    ol.control.Zoom.prototype.dispatchEvent);
+
+goog.exportProperty(
+    ol.control.Zoom.prototype,
+    'getRevision',
+    ol.control.Zoom.prototype.getRevision);
+
+goog.exportProperty(
+    ol.control.Zoom.prototype,
+    'on',
+    ol.control.Zoom.prototype.on);
+
+goog.exportProperty(
+    ol.control.Zoom.prototype,
+    'once',
+    ol.control.Zoom.prototype.once);
+
+goog.exportProperty(
+    ol.control.Zoom.prototype,
+    'un',
+    ol.control.Zoom.prototype.un);
+
+goog.exportProperty(
+    ol.control.Zoom.prototype,
+    'unByKey',
+    ol.control.Zoom.prototype.unByKey);
+
+goog.exportProperty(
+    ol.control.ZoomSlider.prototype,
+    'getMap',
+    ol.control.ZoomSlider.prototype.getMap);
+
+goog.exportProperty(
+    ol.control.ZoomSlider.prototype,
+    'setMap',
+    ol.control.ZoomSlider.prototype.setMap);
+
+goog.exportProperty(
+    ol.control.ZoomSlider.prototype,
+    'setTarget',
+    ol.control.ZoomSlider.prototype.setTarget);
+
+goog.exportProperty(
+    ol.control.ZoomSlider.prototype,
+    'get',
+    ol.control.ZoomSlider.prototype.get);
+
+goog.exportProperty(
+    ol.control.ZoomSlider.prototype,
+    'getKeys',
+    ol.control.ZoomSlider.prototype.getKeys);
+
+goog.exportProperty(
+    ol.control.ZoomSlider.prototype,
+    'getProperties',
+    ol.control.ZoomSlider.prototype.getProperties);
+
+goog.exportProperty(
+    ol.control.ZoomSlider.prototype,
+    'set',
+    ol.control.ZoomSlider.prototype.set);
+
+goog.exportProperty(
+    ol.control.ZoomSlider.prototype,
+    'setProperties',
+    ol.control.ZoomSlider.prototype.setProperties);
+
+goog.exportProperty(
+    ol.control.ZoomSlider.prototype,
+    'unset',
+    ol.control.ZoomSlider.prototype.unset);
+
+goog.exportProperty(
+    ol.control.ZoomSlider.prototype,
+    'changed',
+    ol.control.ZoomSlider.prototype.changed);
+
+goog.exportProperty(
+    ol.control.ZoomSlider.prototype,
+    'dispatchEvent',
+    ol.control.ZoomSlider.prototype.dispatchEvent);
+
+goog.exportProperty(
+    ol.control.ZoomSlider.prototype,
+    'getRevision',
+    ol.control.ZoomSlider.prototype.getRevision);
+
+goog.exportProperty(
+    ol.control.ZoomSlider.prototype,
+    'on',
+    ol.control.ZoomSlider.prototype.on);
+
+goog.exportProperty(
+    ol.control.ZoomSlider.prototype,
+    'once',
+    ol.control.ZoomSlider.prototype.once);
+
+goog.exportProperty(
+    ol.control.ZoomSlider.prototype,
+    'un',
+    ol.control.ZoomSlider.prototype.un);
+
+goog.exportProperty(
+    ol.control.ZoomSlider.prototype,
+    'unByKey',
+    ol.control.ZoomSlider.prototype.unByKey);
+
+goog.exportProperty(
+    ol.control.ZoomToExtent.prototype,
+    'getMap',
+    ol.control.ZoomToExtent.prototype.getMap);
+
+goog.exportProperty(
+    ol.control.ZoomToExtent.prototype,
+    'setMap',
+    ol.control.ZoomToExtent.prototype.setMap);
+
+goog.exportProperty(
+    ol.control.ZoomToExtent.prototype,
+    'setTarget',
+    ol.control.ZoomToExtent.prototype.setTarget);
+
+goog.exportProperty(
+    ol.control.ZoomToExtent.prototype,
+    'get',
+    ol.control.ZoomToExtent.prototype.get);
+
+goog.exportProperty(
+    ol.control.ZoomToExtent.prototype,
+    'getKeys',
+    ol.control.ZoomToExtent.prototype.getKeys);
+
+goog.exportProperty(
+    ol.control.ZoomToExtent.prototype,
+    'getProperties',
+    ol.control.ZoomToExtent.prototype.getProperties);
+
+goog.exportProperty(
+    ol.control.ZoomToExtent.prototype,
+    'set',
+    ol.control.ZoomToExtent.prototype.set);
+
+goog.exportProperty(
+    ol.control.ZoomToExtent.prototype,
+    'setProperties',
+    ol.control.ZoomToExtent.prototype.setProperties);
+
+goog.exportProperty(
+    ol.control.ZoomToExtent.prototype,
+    'unset',
+    ol.control.ZoomToExtent.prototype.unset);
+
+goog.exportProperty(
+    ol.control.ZoomToExtent.prototype,
+    'changed',
+    ol.control.ZoomToExtent.prototype.changed);
+
+goog.exportProperty(
+    ol.control.ZoomToExtent.prototype,
+    'dispatchEvent',
+    ol.control.ZoomToExtent.prototype.dispatchEvent);
+
+goog.exportProperty(
+    ol.control.ZoomToExtent.prototype,
+    'getRevision',
+    ol.control.ZoomToExtent.prototype.getRevision);
+
+goog.exportProperty(
+    ol.control.ZoomToExtent.prototype,
+    'on',
+    ol.control.ZoomToExtent.prototype.on);
+
+goog.exportProperty(
+    ol.control.ZoomToExtent.prototype,
+    'once',
+    ol.control.ZoomToExtent.prototype.once);
+
+goog.exportProperty(
+    ol.control.ZoomToExtent.prototype,
+    'un',
+    ol.control.ZoomToExtent.prototype.un);
+
+goog.exportProperty(
+    ol.control.ZoomToExtent.prototype,
+    'unByKey',
+    ol.control.ZoomToExtent.prototype.unByKey);
+OPENLAYERS.ol = ol;
+
+  return OPENLAYERS.ol;
+}));
diff --git a/chimere/static/ol3/ol.css b/chimere/static/ol3/ol.css
new file mode 100644
index 0000000..ea50e7e
--- /dev/null
+++ b/chimere/static/ol3/ol.css
@@ -0,0 +1 @@
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diff --git a/chimere/static/ol3/ol.js b/chimere/static/ol3/ol.js
new file mode 100644
index 0000000..49d2e32
--- /dev/null
+++ b/chimere/static/ol3/ol.js
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+// OpenLayers 3. See http://openlayers.org/
+// License: https://raw.githubusercontent.com/openlayers/ol3/master/LICENSE.md
+// Version: v3.12.1
+
+(function (root, factory) {
+  if (typeof exports === "object") {
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+  } else if (typeof define === "function" && define.amd) {
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+  }
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+
+ Latitude/longitude spherical geodesy formulae taken from
+ http://www.movable-type.co.uk/scripts/latlong.html
+ Licensed under CC-BY-3.0.
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+il.prototype.setMap=function(b){if(this.a){this.a.l.removeChild(this.f);var c=this.f.style;c.left=c.top=c.width=c.height="inherit"}(this.a=b)&&this.a.l.appendChild(this.f)};function kl(b){var c=b.g,d=b.b,c=[c,[c[0],d[1]],d,[d[0],c[1]]].map(b.a.Ga,b.a);c[4]=c[0].slice();b.c?b.c.la([c]):b.c=new F([c])}il.prototype.X=function(){return this.c};function ll(b,c){tc.call(this,b);this.coordinate=c}y(ll,tc);function ml(b){Yk.call(this,{handleDownEvent:nl,handleDragEvent:pl,handleUpEvent:ql});b=b?b:{};this.c=new il(b.className||"ol-dragbox");this.a=null;this.v=b.condition?b.condition:te}y(ml,Yk);function pl(b){if(Xk(b)){var c=this.c;b=b.pixel;c.g=this.a;c.b=b;kl(c);jl(c)}}ml.prototype.X=function(){return this.c.X()};ml.prototype.o=za;
+function ql(b){if(!Xk(b))return!0;this.c.setMap(null);var c=b.pixel[0]-this.a[0],d=b.pixel[1]-this.a[1];64<=c*c+d*d&&(this.o(b),this.s(new ll("boxend",b.coordinate)));return!1}function nl(b){if(Xk(b)&&zc(b.a)&&this.v(b)){this.a=b.pixel;this.c.setMap(b.map);var c=this.c,d=this.a;c.g=this.a;c.b=d;kl(c);jl(c);this.s(new ll("boxstart",b.coordinate));return!0}return!1};function rl(b){b=b?b:{};var c=b.condition?b.condition:Vk;this.l=void 0!==b.duration?b.duration:200;ml.call(this,{condition:c,className:b.className||"ol-dragzoom"})}y(rl,ml);rl.prototype.o=function(){var b=this.B,c=b.aa(),d=b.Sa(),e=this.X().J(),d=c.constrainResolution(Math.max(je(e)/d[0],ke(e)/d[1])),f=c.$(),g=c.Ua();b.Na($f({resolution:f,duration:this.l,easing:Uf}));b.Na(Yf({source:g,duration:this.l,easing:Uf}));c.kb(le(e));c.Ub(d)};function sl(b){Lk.call(this,{handleEvent:tl});b=b||{};this.a=void 0!==b.condition?b.condition:ye(Uk,Wk);this.c=void 0!==b.duration?b.duration:100;this.j=void 0!==b.pixelDelta?b.pixelDelta:128}y(sl,Lk);
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+wl.prototype.v=function(b){var c=Sa(this.c,-1,1),d=b.aa();b.render();Nk(b,d,-c,this.a,this.C);this.c=0;this.a=null;this.l=this.j=void 0};wl.prototype.D=function(b){this.o=b;b||(this.a=null)};function yl(b){Yk.call(this,{handleDownEvent:zl,handleDragEvent:Al,handleUpEvent:Bl});b=b||{};this.c=null;this.l=void 0;this.a=!1;this.o=0;this.D=void 0!==b.threshold?b.threshold:.3;this.v=void 0!==b.duration?b.duration:250}y(yl,Yk);
+function Al(b){var c=0,d=this.j[0],e=this.j[1],d=Math.atan2(e.clientY-d.clientY,e.clientX-d.clientX);void 0!==this.l&&(c=d-this.l,this.o+=c,!this.a&&Math.abs(this.o)>this.D&&(this.a=!0));this.l=d;b=b.map;d=dh(b.a);e=$k(this.j);e[0]-=d.x;e[1]-=d.y;this.c=b.Ga(e);this.a&&(d=b.aa(),e=d.Fa(),b.render(),Mk(b,d,e+c,this.c))}function Bl(b){if(2>this.j.length){b=b.map;var c=b.aa();Sf(c,-1);if(this.a){var d=c.Fa(),e=this.c,f=this.v,d=c.constrainRotation(d,0);Mk(b,c,d,e,f)}return!1}return!0}
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+function im(b,c,d,e){var f=0;if(b.fa&&""!==b.c){b.l&&jm(b,b.l);b.G&&km(b,b.G);var g=b.fa,h=b.b,k=b.gb;k?(k.font!=g.font&&(k.font=h.font=g.font),k.textAlign!=g.textAlign&&(k.textAlign=h.textAlign=g.textAlign),k.textBaseline!=g.textBaseline&&(k.textBaseline=h.textBaseline=g.textBaseline)):(h.font=g.font,h.textAlign=g.textAlign,h.textBaseline=g.textBaseline,b.gb={font:g.font,textAlign:g.textAlign,textBaseline:g.textBaseline});c=af(c,f,d,e,b.na,b.C);for(g=b.b;f<d;f+=e){h=c[f]+b.nc;k=c[f+1]+b.Od;if(0!==
+b.O||1!=b.o){var m=gk(b.Cc,h,k,b.o,b.o,b.O,-h,-k);g.setTransform(m[0],m[1],m[4],m[5],m[12],m[13])}b.G&&g.strokeText(b.c,h,k);b.l&&g.fillText(b.c,h,k)}0===b.O&&1==b.o||g.setTransform(1,0,0,1,0,0)}}function lm(b,c,d,e,f,g){var h=b.b;b=af(c,d,e,f,b.na,b.C);h.moveTo(b[0],b[1]);for(c=2;c<b.length;c+=2)h.lineTo(b[c],b[c+1]);g&&h.lineTo(b[0],b[1]);return e}function mm(b,c,d,e,f){var g=b.b,h,k;h=0;for(k=e.length;h<k;++h)d=lm(b,c,d,e[h],f,!0),g.closePath();return d}l=gm.prototype;
+l.md=function(b,c){var d=b.toString(),e=this.v[d];void 0!==e?e.push(c):this.v[d]=[c]};l.Gc=function(b){if(oe(this.g,b.J())){if(this.f||this.a){this.f&&jm(this,this.f);this.a&&km(this,this.a);var c;c=this.na;var d=this.C,e=b.ia();c=e?af(e,0,e.length,b.ra(),c,d):null;d=c[2]-c[0];e=c[3]-c[1];d=Math.sqrt(d*d+e*e);e=this.b;e.beginPath();e.arc(c[0],c[1],d,0,2*Math.PI);this.f&&e.fill();this.a&&e.stroke()}""!==this.c&&im(this,b.wd(),2,2)}};
+l.jf=function(b,c){var d=(0,c.c)(b);if(d&&oe(this.g,d.J())){var e=c.a;void 0===e&&(e=0);this.md(e,function(b){b.bb(c.g,c.b);b.ub(c.f);b.cb(c.Ca());nm[d.W()].call(b,d,null)})}};l.Yd=function(b,c){var d=b.c,e,f;e=0;for(f=d.length;e<f;++e){var g=d[e];nm[g.W()].call(this,g,c)}};l.Hb=function(b){var c=b.ia();b=b.ra();this.i&&hm(this,c,c.length);""!==this.c&&im(this,c,c.length,b)};l.Gb=function(b){var c=b.ia();b=b.ra();this.i&&hm(this,c,c.length);""!==this.c&&im(this,c,c.length,b)};
+l.Wb=function(b){if(oe(this.g,b.J())){if(this.a){km(this,this.a);var c=this.b,d=b.ia();c.beginPath();lm(this,d,0,d.length,b.ra(),!1);c.stroke()}""!==this.c&&(b=om(b),im(this,b,2,2))}};l.Hc=function(b){var c=b.J();if(oe(this.g,c)){if(this.a){km(this,this.a);var c=this.b,d=b.ia(),e=0,f=b.zb(),g=b.ra();c.beginPath();var h,k;h=0;for(k=f.length;h<k;++h)e=lm(this,d,e,f[h],g,!1);c.stroke()}""!==this.c&&(b=pm(b),im(this,b,b.length,2))}};
+l.Jc=function(b){if(oe(this.g,b.J())){if(this.a||this.f){this.f&&jm(this,this.f);this.a&&km(this,this.a);var c=this.b;c.beginPath();mm(this,b.bc(),0,b.zb(),b.ra());this.f&&c.fill();this.a&&c.stroke()}""!==this.c&&(b=If(b),im(this,b,2,2))}};
+l.Ic=function(b){if(oe(this.g,b.J())){if(this.a||this.f){this.f&&jm(this,this.f);this.a&&km(this,this.a);var c=this.b,d=rm(b),e=0,f=b.g,g=b.ra(),h,k;h=0;for(k=f.length;h<k;++h){var m=f[h];c.beginPath();e=mm(this,d,e,m,g);this.f&&c.fill();this.a&&c.stroke()}}""!==this.c&&(b=sm(b),im(this,b,b.length,2))}};function tm(b){var c=Object.keys(b.v).map(Number);c.sort(ub);var d,e,f,g,h;d=0;for(e=c.length;d<e;++d)for(f=b.v[c[d].toString()],g=0,h=f.length;g<h;++g)f[g](b)}
+function jm(b,c){var d=b.b,e=b.ga;e?e.fillStyle!=c.fillStyle&&(e.fillStyle=d.fillStyle=c.fillStyle):(d.fillStyle=c.fillStyle,b.ga={fillStyle:c.fillStyle})}
+function km(b,c){var d=b.b,e=b.oa;e?(e.lineCap!=c.lineCap&&(e.lineCap=d.lineCap=c.lineCap),Wi&&!rb(e.lineDash,c.lineDash)&&d.setLineDash(e.lineDash=c.lineDash),e.lineJoin!=c.lineJoin&&(e.lineJoin=d.lineJoin=c.lineJoin),e.lineWidth!=c.lineWidth&&(e.lineWidth=d.lineWidth=c.lineWidth),e.miterLimit!=c.miterLimit&&(e.miterLimit=d.miterLimit=c.miterLimit),e.strokeStyle!=c.strokeStyle&&(e.strokeStyle=d.strokeStyle=c.strokeStyle)):(d.lineCap=c.lineCap,Wi&&d.setLineDash(c.lineDash),d.lineJoin=c.lineJoin,d.lineWidth=
+c.lineWidth,d.miterLimit=c.miterLimit,d.strokeStyle=c.strokeStyle,b.oa={lineCap:c.lineCap,lineDash:c.lineDash,lineJoin:c.lineJoin,lineWidth:c.lineWidth,miterLimit:c.miterLimit,strokeStyle:c.strokeStyle})}
+l.bb=function(b,c){if(b){var d=b.a;this.f={fillStyle:vg(d?d:Ql)}}else this.f=null;if(c){var d=c.a,e=c.c,f=c.b,g=c.g,h=c.f,k=c.i;this.a={lineCap:void 0!==e?e:"round",lineDash:f?f:Rl,lineJoin:void 0!==g?g:"round",lineWidth:this.D*(void 0!==h?h:1),miterLimit:void 0!==k?k:10,strokeStyle:vg(d?d:Sl)}}else this.a=null};
+l.ub=function(b){if(b){var c=b.Xb(),d=b.gc(1),e=b.Da(),f=b.Cb();this.va=c[0];this.U=c[1];this.T=f[1];this.i=d;this.B=b.B;this.pa=e[0];this.wa=e[1];this.hb=b.C;this.Db=b.G;this.j=b.j;this.Eb=b.D;this.V=f[0]}else this.i=null};
+l.cb=function(b){if(b){var c=b.a;c?(c=c.a,this.l={fillStyle:vg(c?c:Ql)}):this.l=null;var d=b.j;if(d){var c=d.a,e=d.c,f=d.b,g=d.g,h=d.f,d=d.i;this.G={lineCap:void 0!==e?e:"round",lineDash:f?f:Rl,lineJoin:void 0!==g?g:"round",lineWidth:void 0!==h?h:1,miterLimit:void 0!==d?d:10,strokeStyle:vg(c?c:Sl)}}else this.G=null;var c=b.b,e=b.c,f=b.g,g=b.i,h=b.f,d=b.Ca(),k=b.l;b=b.o;this.fa={font:void 0!==c?c:"10px sans-serif",textAlign:void 0!==k?k:"center",textBaseline:void 0!==b?b:"middle"};this.c=void 0!==
+d?d:"";this.nc=void 0!==e?this.D*e:0;this.Od=void 0!==f?this.D*f:0;this.O=void 0!==g?g:0;this.o=this.D*(void 0!==h?h:1)}else this.c=""};var nm={Point:gm.prototype.Hb,LineString:gm.prototype.Wb,Polygon:gm.prototype.Jc,MultiPoint:gm.prototype.Gb,MultiLineString:gm.prototype.Hc,MultiPolygon:gm.prototype.Ic,GeometryCollection:gm.prototype.Yd,Circle:gm.prototype.Gc};function um(b){jk.call(this,b);this.O=Bd()}y(um,jk);
+um.prototype.G=function(b,c,d){vm(this,"precompose",d,b,void 0);var e=this.zd();if(e){var f=c.extent,g=void 0!==f;if(g){var h=b.pixelRatio,k=ge(f),m=fe(f),n=ee(f),f=de(f);ik(b.coordinateToPixelMatrix,k,k);ik(b.coordinateToPixelMatrix,m,m);ik(b.coordinateToPixelMatrix,n,n);ik(b.coordinateToPixelMatrix,f,f);d.save();d.beginPath();d.moveTo(k[0]*h,k[1]*h);d.lineTo(m[0]*h,m[1]*h);d.lineTo(n[0]*h,n[1]*h);d.lineTo(f[0]*h,f[1]*h);d.clip()}h=this.nf();k=d.globalAlpha;d.globalAlpha=c.opacity;0===b.viewState.rotation?
+d.drawImage(e,0,0,+e.width,+e.height,Math.round(h[12]),Math.round(h[13]),Math.round(e.width*h[0]),Math.round(e.height*h[5])):(d.setTransform(h[0],h[1],h[4],h[5],h[12],h[13]),d.drawImage(e,0,0),d.setTransform(1,0,0,1,0,0));d.globalAlpha=k;g&&d.restore()}vm(this,"postcompose",d,b,void 0)};function vm(b,c,d,e,f){var g=b.a;cd(g,c)&&(b=void 0!==f?f:wm(b,e,0),b=new gm(d,e.pixelRatio,e.extent,b,e.viewState.rotation),g.s(new bk(c,g,b,e,d,null)),tm(b))}
+function wm(b,c,d){var e=c.viewState,f=c.pixelRatio;return gk(b.O,f*c.size[0]/2,f*c.size[1]/2,f/e.resolution,-f/e.resolution,-e.rotation,-e.center[0]+d,-e.center[1])}function xm(b,c){var d=[0,0];ik(c,b,d);return d}
+var ym=function(){var b=null,c=null;return function(d){if(!b){b=Ni(1,1);c=b.createImageData(1,1);var e=c.data;e[0]=42;e[1]=84;e[2]=126;e[3]=255}var e=b.canvas,f=d[0]<=e.width&&d[1]<=e.height;f||(e.width=d[0],e.height=d[1],e=d[0]-1,d=d[1]-1,b.putImageData(c,e,d),d=b.getImageData(e,d,1,1),f=rb(c.data,d.data));return f}}();var zm=["Polygon","LineString","Image","Text"];function Am(b,c,d){this.gb=b;this.V=c;this.c=null;this.g=0;this.resolution=d;this.U=this.va=null;this.f=[];this.coordinates=[];this.ga=Bd();this.a=[];this.fa=[];this.oa=Bd()}y(Am,ak);
+function Bm(b,c,d,e,f,g){var h=b.coordinates.length,k=b.lf(),m=[c[d],c[d+1]],n=[NaN,NaN],p=!0,q,r,t;for(q=d+f;q<e;q+=f)n[0]=c[q],n[1]=c[q+1],t=Wd(k,n),t!==r?(p&&(b.coordinates[h++]=m[0],b.coordinates[h++]=m[1]),b.coordinates[h++]=n[0],b.coordinates[h++]=n[1],p=!1):1===t?(b.coordinates[h++]=n[0],b.coordinates[h++]=n[1],p=!1):p=!0,m[0]=n[0],m[1]=n[1],r=t;q===d+f&&(b.coordinates[h++]=m[0],b.coordinates[h++]=m[1]);g&&(b.coordinates[h++]=c[d],b.coordinates[h++]=c[d+1]);return h}
+function Cm(b,c){b.va=[0,c,0];b.f.push(b.va);b.U=[0,c,0];b.a.push(b.U)}
+function Dm(b,c,d,e,f,g,h,k,m){var n;hk(e,b.ga)?n=b.fa:(n=af(b.coordinates,0,b.coordinates.length,2,e,b.fa),Ed(b.ga,e));e=!Pb(g);var p=0,q=h.length,r=0,t;b=b.oa;for(var x,z,A,B;p<q;){var v=h[p],L,M,J,C;switch(v[0]){case 0:r=v[1];e&&g[w(r).toString()]||!r.X()?p=v[2]:void 0===m||oe(m,r.X().J())?++p:p=v[2];break;case 1:c.beginPath();++p;break;case 2:r=v[1];t=n[r];v=n[r+1];A=n[r+2]-t;r=n[r+3]-v;c.arc(t,v,Math.sqrt(A*A+r*r),0,2*Math.PI,!0);++p;break;case 3:c.closePath();++p;break;case 4:r=v[1];t=v[2];
+L=v[3];J=v[4]*d;var sa=v[5]*d,la=v[6];M=v[7];var K=v[8],ma=v[9];A=v[11];B=v[12];var Ua=v[13],Nb=v[14];for(v[10]&&(A+=f);r<t;r+=2){v=n[r]-J;C=n[r+1]-sa;Ua&&(v=v+.5|0,C=C+.5|0);if(1!=B||0!==A){var na=v+J,Fa=C+sa;gk(b,na,Fa,B,B,A,-na,-Fa);c.setTransform(b[0],b[1],b[4],b[5],b[12],b[13])}na=c.globalAlpha;1!=M&&(c.globalAlpha=na*M);c.drawImage(L,K,ma,Nb,la,v,C,Nb*d,la*d);1!=M&&(c.globalAlpha=na);1==B&&0===A||c.setTransform(1,0,0,1,0,0)}++p;break;case 5:r=v[1];t=v[2];J=v[3];sa=v[4]*d;la=v[5]*d;A=v[6];B=
+v[7]*d;L=v[8];for(M=v[9];r<t;r+=2){v=n[r]+sa;C=n[r+1]+la;if(1!=B||0!==A)gk(b,v,C,B,B,A,-v,-C),c.setTransform(b[0],b[1],b[4],b[5],b[12],b[13]);K=J.split("\n");ma=K.length;1<ma?(Ua=Math.round(1.5*c.measureText("M").width),C-=(ma-1)/2*Ua):Ua=0;for(Nb=0;Nb<ma;Nb++)na=K[Nb],M&&c.strokeText(na,v,C),L&&c.fillText(na,v,C),C+=Ua;1==B&&0===A||c.setTransform(1,0,0,1,0,0)}++p;break;case 6:if(void 0!==k&&(r=v[1],r=k(r)))return r;++p;break;case 7:c.fill();++p;break;case 8:r=v[1];t=v[2];v=n[r];C=n[r+1];A=v+.5|0;
+B=C+.5|0;if(A!==x||B!==z)c.moveTo(v,C),x=A,z=B;for(r+=2;r<t;r+=2)if(v=n[r],C=n[r+1],A=v+.5|0,B=C+.5|0,A!==x||B!==z)c.lineTo(v,C),x=A,z=B;++p;break;case 9:c.fillStyle=v[1];++p;break;case 10:x=void 0!==v[7]?v[7]:!0;z=v[2];c.strokeStyle=v[1];c.lineWidth=x?z*d:z;c.lineCap=v[3];c.lineJoin=v[4];c.miterLimit=v[5];Wi&&c.setLineDash(v[6]);z=x=NaN;++p;break;case 11:c.font=v[1];c.textAlign=v[2];c.textBaseline=v[3];++p;break;case 12:c.stroke();++p;break;default:++p}}}
+function Em(b){var c=b.a;c.reverse();var d,e=c.length,f,g,h=-1;for(d=0;d<e;++d)if(f=c[d],g=f[0],6==g)h=d;else if(0==g){f[2]=d;f=b.a;for(g=d;h<g;){var k=f[h];f[h]=f[g];f[g]=k;++h;--g}h=-1}}function Fm(b,c){b.va[2]=b.f.length;b.va=null;b.U[2]=b.a.length;b.U=null;var d=[6,c];b.f.push(d);b.a.push(d)}Am.prototype.we=za;Am.prototype.lf=function(){return this.V};
+function Gm(b,c,d){Am.call(this,b,c,d);this.l=this.T=null;this.na=this.O=this.D=this.C=this.v=this.B=this.G=this.o=this.j=this.i=this.b=void 0}y(Gm,Am);Gm.prototype.Hb=function(b,c){if(this.l){Cm(this,c);var d=b.ia(),e=this.coordinates.length,d=Bm(this,d,0,d.length,b.ra(),!1);this.f.push([4,e,d,this.l,this.b,this.i,this.j,this.o,this.G,this.B,this.v,this.C,this.D,this.O,this.na]);this.a.push([4,e,d,this.T,this.b,this.i,this.j,this.o,this.G,this.B,this.v,this.C,this.D,this.O,this.na]);Fm(this,c)}};
+Gm.prototype.Gb=function(b,c){if(this.l){Cm(this,c);var d=b.ia(),e=this.coordinates.length,d=Bm(this,d,0,d.length,b.ra(),!1);this.f.push([4,e,d,this.l,this.b,this.i,this.j,this.o,this.G,this.B,this.v,this.C,this.D,this.O,this.na]);this.a.push([4,e,d,this.T,this.b,this.i,this.j,this.o,this.G,this.B,this.v,this.C,this.D,this.O,this.na]);Fm(this,c)}};Gm.prototype.we=function(){Em(this);this.i=this.b=void 0;this.l=this.T=null;this.na=this.O=this.C=this.v=this.B=this.G=this.o=this.D=this.j=void 0};
+Gm.prototype.ub=function(b){var c=b.Xb(),d=b.Cb(),e=b.Ae(1),f=b.gc(1),g=b.Da();this.b=c[0];this.i=c[1];this.T=e;this.l=f;this.j=d[1];this.o=b.B;this.G=g[0];this.B=g[1];this.v=b.C;this.C=b.G;this.D=b.j;this.O=b.D;this.na=d[0]};function Hm(b,c,d){Am.call(this,b,c,d);this.b={jd:void 0,dd:void 0,ed:null,fd:void 0,gd:void 0,hd:void 0,sf:0,strokeStyle:void 0,lineCap:void 0,lineDash:null,lineJoin:void 0,lineWidth:void 0,miterLimit:void 0}}y(Hm,Am);
+function Im(b,c,d,e,f){var g=b.coordinates.length;c=Bm(b,c,d,e,f,!1);g=[8,g,c];b.f.push(g);b.a.push(g);return e}l=Hm.prototype;l.lf=function(){this.c||(this.c=Rd(this.V),0<this.g&&Qd(this.c,this.resolution*(this.g+1)/2,this.c));return this.c};
+function Jm(b){var c=b.b,d=c.strokeStyle,e=c.lineCap,f=c.lineDash,g=c.lineJoin,h=c.lineWidth,k=c.miterLimit;c.jd==d&&c.dd==e&&rb(c.ed,f)&&c.fd==g&&c.gd==h&&c.hd==k||(c.sf!=b.coordinates.length&&(b.f.push([12]),c.sf=b.coordinates.length),b.f.push([10,d,h,e,g,k,f],[1]),c.jd=d,c.dd=e,c.ed=f,c.fd=g,c.gd=h,c.hd=k)}
+l.Wb=function(b,c){var d=this.b,e=d.lineWidth;void 0!==d.strokeStyle&&void 0!==e&&(Jm(this),Cm(this,c),this.a.push([10,d.strokeStyle,d.lineWidth,d.lineCap,d.lineJoin,d.miterLimit,d.lineDash],[1]),d=b.ia(),Im(this,d,0,d.length,b.ra()),this.a.push([12]),Fm(this,c))};
+l.Hc=function(b,c){var d=this.b,e=d.lineWidth;if(void 0!==d.strokeStyle&&void 0!==e){Jm(this);Cm(this,c);this.a.push([10,d.strokeStyle,d.lineWidth,d.lineCap,d.lineJoin,d.miterLimit,d.lineDash],[1]);var d=b.zb(),e=b.ia(),f=b.ra(),g=0,h,k;h=0;for(k=d.length;h<k;++h)g=Im(this,e,g,d[h],f);this.a.push([12]);Fm(this,c)}};l.we=function(){this.b.sf!=this.coordinates.length&&this.f.push([12]);Em(this);this.b=null};
+l.bb=function(b,c){var d=c.a;this.b.strokeStyle=vg(d?d:Sl);d=c.c;this.b.lineCap=void 0!==d?d:"round";d=c.b;this.b.lineDash=d?d:Rl;d=c.g;this.b.lineJoin=void 0!==d?d:"round";d=c.f;this.b.lineWidth=void 0!==d?d:1;d=c.i;this.b.miterLimit=void 0!==d?d:10;this.b.lineWidth>this.g&&(this.g=this.b.lineWidth,this.c=null)};
+function Km(b,c,d){Am.call(this,b,c,d);this.b={qg:void 0,jd:void 0,dd:void 0,ed:null,fd:void 0,gd:void 0,hd:void 0,fillStyle:void 0,strokeStyle:void 0,lineCap:void 0,lineDash:null,lineJoin:void 0,lineWidth:void 0,miterLimit:void 0}}y(Km,Am);
+function Lm(b,c,d,e,f){var g=b.b,h=[1];b.f.push(h);b.a.push(h);var k,h=0;for(k=e.length;h<k;++h){var m=e[h],n=b.coordinates.length;d=Bm(b,c,d,m,f,!0);d=[8,n,d];n=[3];b.f.push(d,n);b.a.push(d,n);d=m}c=[7];b.a.push(c);void 0!==g.fillStyle&&b.f.push(c);void 0!==g.strokeStyle&&(g=[12],b.f.push(g),b.a.push(g));return d}l=Km.prototype;
+l.Gc=function(b,c){var d=this.b,e=d.strokeStyle;if(void 0!==d.fillStyle||void 0!==e){Mm(this);Cm(this,c);this.a.push([9,vg(Ql)]);void 0!==d.strokeStyle&&this.a.push([10,d.strokeStyle,d.lineWidth,d.lineCap,d.lineJoin,d.miterLimit,d.lineDash]);var f=b.ia(),e=this.coordinates.length;Bm(this,f,0,f.length,b.ra(),!1);f=[1];e=[2,e];this.f.push(f,e);this.a.push(f,e);e=[7];this.a.push(e);void 0!==d.fillStyle&&this.f.push(e);void 0!==d.strokeStyle&&(d=[12],this.f.push(d),this.a.push(d));Fm(this,c)}};
+l.Jc=function(b,c){var d=this.b,e=d.strokeStyle;if(void 0!==d.fillStyle||void 0!==e)Mm(this),Cm(this,c),this.a.push([9,vg(Ql)]),void 0!==d.strokeStyle&&this.a.push([10,d.strokeStyle,d.lineWidth,d.lineCap,d.lineJoin,d.miterLimit,d.lineDash]),d=b.zb(),e=b.bc(),Lm(this,e,0,d,b.ra()),Fm(this,c)};
+l.Ic=function(b,c){var d=this.b,e=d.strokeStyle;if(void 0!==d.fillStyle||void 0!==e){Mm(this);Cm(this,c);this.a.push([9,vg(Ql)]);void 0!==d.strokeStyle&&this.a.push([10,d.strokeStyle,d.lineWidth,d.lineCap,d.lineJoin,d.miterLimit,d.lineDash]);var d=b.g,e=rm(b),f=b.ra(),g=0,h,k;h=0;for(k=d.length;h<k;++h)g=Lm(this,e,g,d[h],f);Fm(this,c)}};l.we=function(){Em(this);this.b=null;var b=this.gb;if(0!==b){var c=this.coordinates,d,e;d=0;for(e=c.length;d<e;++d)c[d]=b*Math.round(c[d]/b)}};
+l.lf=function(){this.c||(this.c=Rd(this.V),0<this.g&&Qd(this.c,this.resolution*(this.g+1)/2,this.c));return this.c};
+l.bb=function(b,c){var d=this.b;if(b){var e=b.a;d.fillStyle=vg(e?e:Ql)}else d.fillStyle=void 0;c?(e=c.a,d.strokeStyle=vg(e?e:Sl),e=c.c,d.lineCap=void 0!==e?e:"round",e=c.b,d.lineDash=e?e.slice():Rl,e=c.g,d.lineJoin=void 0!==e?e:"round",e=c.f,d.lineWidth=void 0!==e?e:1,e=c.i,d.miterLimit=void 0!==e?e:10,d.lineWidth>this.g&&(this.g=d.lineWidth,this.c=null)):(d.strokeStyle=void 0,d.lineCap=void 0,d.lineDash=null,d.lineJoin=void 0,d.lineWidth=void 0,d.miterLimit=void 0)};
+function Mm(b){var c=b.b,d=c.fillStyle,e=c.strokeStyle,f=c.lineCap,g=c.lineDash,h=c.lineJoin,k=c.lineWidth,m=c.miterLimit;void 0!==d&&c.qg!=d&&(b.f.push([9,d]),c.qg=c.fillStyle);void 0===e||c.jd==e&&c.dd==f&&c.ed==g&&c.fd==h&&c.gd==k&&c.hd==m||(b.f.push([10,e,k,f,h,m,g]),c.jd=e,c.dd=f,c.ed=g,c.fd=h,c.gd=k,c.hd=m)}function Nm(b,c,d){Am.call(this,b,c,d);this.O=this.D=this.C=null;this.l="";this.v=this.B=this.G=this.o=0;this.j=this.i=this.b=null}y(Nm,Am);
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+f.lineDash,!1],this.f.push(k),this.a.push(k),h?(h.lineCap=f.lineCap,h.lineDash=f.lineDash,h.lineJoin=f.lineJoin,h.lineWidth=f.lineWidth,h.miterLimit=f.miterLimit,h.strokeStyle=f.strokeStyle):this.D={lineCap:f.lineCap,lineDash:f.lineDash,lineJoin:f.lineJoin,lineWidth:f.lineWidth,miterLimit:f.miterLimit,strokeStyle:f.strokeStyle}));f=this.j;h=this.O;h&&h.font==f.font&&h.textAlign==f.textAlign&&h.textBaseline==f.textBaseline||(k=[11,f.font,f.textAlign,f.textBaseline],this.f.push(k),this.a.push(k),h?
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+Nm.prototype.cb=function(b){if(b){var c=b.a;c?(c=c.a,c=vg(c?c:Ql),this.b?this.b.fillStyle=c:this.b={fillStyle:c}):this.b=null;var d=b.j;if(d){var c=d.a,e=d.c,f=d.b,g=d.g,h=d.f,d=d.i,e=void 0!==e?e:"round",f=f?f.slice():Rl,g=void 0!==g?g:"round",h=void 0!==h?h:1,d=void 0!==d?d:10,c=vg(c?c:Sl);if(this.i){var k=this.i;k.lineCap=e;k.lineDash=f;k.lineJoin=g;k.lineWidth=h;k.miterLimit=d;k.strokeStyle=c}else this.i={lineCap:e,lineDash:f,lineJoin:g,lineWidth:h,miterLimit:d,strokeStyle:c}}else this.i=null;
+var m=b.b,c=b.c,e=b.g,f=b.i,h=b.f,d=b.Ca(),g=b.l,k=b.o;b=void 0!==m?m:"10px sans-serif";g=void 0!==g?g:"center";k=void 0!==k?k:"middle";this.j?(m=this.j,m.font=b,m.textAlign=g,m.textBaseline=k):this.j={font:b,textAlign:g,textBaseline:k};this.l=void 0!==d?d:"";this.o=void 0!==c?c:0;this.G=void 0!==e?e:0;this.B=void 0!==f?f:0;this.v=void 0!==h?h:1}else this.l=""};function Om(b,c,d,e){this.G=b;this.g=c;this.o=d;this.i=e;this.f={};this.j=Ni(1,1);this.l=Bd()}
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+Om.prototype.a=function(b,c){var d=void 0!==b?b.toString():"0",e=this.f[d];void 0===e&&(e={},this.f[d]=e);d=e[c];void 0===d&&(d=new Rm[c](this.G,this.g,this.o),e[c]=d);return d};Om.prototype.La=function(){return Pb(this.f)};
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+l.Ad=function(b,c){var d=b.pixelRatio,e=b.viewState,f=e.center,g=e.resolution,h=e.rotation,k=this.a.ea(),m=b.viewHints,n=b.extent;void 0!==c.extent&&(n=ne(n,c.extent));m[0]||m[1]||ie(n)||(e=k.C(n,g,d,e.projection))&&lk(this,e)&&(this.g=e);if(this.g){var e=this.g,m=e.J(),n=e.$(),p=e.b,g=d*n/(g*p);gk(this.i,d*b.size[0]/2,d*b.size[1]/2,g,g,h,p*(m[0]-f[0])/n,p*(f[1]-m[3])/n);this.c=null;nk(b.attributions,e.i);ok(b,k)}return!0};function Pp(b){um.call(this,b);this.b=this.i=null;this.o=!1;this.j=null;this.B=Bd();this.g=null;this.C=this.D=this.v=NaN;this.l=this.c=null;this.U=[0,0]}y(Pp,um);Pp.prototype.zd=function(){return this.i};Pp.prototype.nf=function(){return this.B};
+Pp.prototype.Ad=function(b,c){function d(b){b=b.state;return 2==b||4==b||3==b&&!K}var e=b.pixelRatio,f=b.viewState,g=f.projection,h=this.a,k=h.ea(),m=k.ib(g),n=k.ae(),p=Ih(m,f.resolution),q=k.Qb(p,b.pixelRatio,g),r=q[0]/md(m.Ka(p),this.U)[0],t=m.$(p),r=t/r,x=f.center,z;t==f.resolution?(x=qk(x,t,b.size),z=me(x,t,f.rotation,b.size)):z=b.extent;void 0!==c.extent&&(z=ne(z,c.extent));if(ie(z))return!1;var A=Fh(m,z,t),B=q[0]*kg(A),v=q[1]*jg(A),L,M;this.i?(L=this.i,M=this.j,this.b[0]<B||this.b[1]<v||this.D!==
+q[0]||this.C!==q[1]||this.o&&(this.b[0]>B||this.b[1]>v)?(L.width=B,L.height=v,this.b=[B,v],this.o=!ym(this.b),this.c=null):(B=this.b[0],v=this.b[1],p==this.v&&hg(this.c,A)||(this.c=null))):(M=Ni(B,v),this.i=M.canvas,this.b=[B,v],this.j=M,this.o=!ym(this.b));var J,C;this.c?(v=this.c,B=kg(v)):(B/=q[0],v/=q[1],J=A.a-Math.floor((B-kg(A))/2),C=A.f-Math.floor((v-jg(A))/2),this.v=p,this.D=q[0],this.C=q[1],this.c=new fg(J,J+B-1,C,C+v-1),this.l=Array(B*v),v=this.c);L={};L[p]={};var sa=[],la=this.cd(k,g,L),
+K=h.b(),ma=Md(),Ua=new fg(0,0,0,0),Nb,na,Fa;for(C=A.a;C<=A.c;++C)for(Fa=A.f;Fa<=A.b;++Fa)na=k.Pb(p,C,Fa,e,g),!d(na)&&na.f&&(na=na.f),d(na)?L[p][eg(na.a)]=na:(Nb=Ch(m,na.a,la,Ua,ma),Nb||(sa.push(na),(Nb=Eh(m,na.a,Ua,ma))&&la(p+1,Nb)));la=0;for(Nb=sa.length;la<Nb;++la)na=sa[la],C=q[0]*(na.a[1]-v.a),Fa=q[1]*(v.b-na.a[2]),M.clearRect(C,Fa,q[0],q[1]);sa=Object.keys(L).map(Number);sa.sort(ub);var ad=k.pa,Qc=ge(m.Aa([p,v.a,v.b],ma)),sf,zj,$d,ci,cg,qm,la=0;for(Nb=sa.length;la<Nb;++la)if(sf=sa[la],q=k.Qb(sf,
+e,g),ci=L[sf],sf==p)for(zj in ci)na=ci[zj],J=(na.a[2]-v.f)*B+(na.a[1]-v.a),this.l[J]!=na&&(C=q[0]*(na.a[1]-v.a),Fa=q[1]*(v.b-na.a[2]),$d=na.state,4!=$d&&(3!=$d||K)&&ad||M.clearRect(C,Fa,q[0],q[1]),2==$d&&M.drawImage(na.Ta(),n,n,q[0],q[1],C,Fa,q[0],q[1]),this.l[J]=na);else for(zj in sf=m.$(sf)/t,ci)for(na=ci[zj],J=m.Aa(na.a,ma),C=(J[0]-Qc[0])/r,Fa=(Qc[1]-J[3])/r,qm=sf*q[0],cg=sf*q[1],$d=na.state,4!=$d&&ad||M.clearRect(C,Fa,qm,cg),2==$d&&M.drawImage(na.Ta(),n,n,q[0],q[1],C,Fa,qm,cg),na=Dh(m,J,p,Ua),
+J=Math.max(na.a,v.a),Fa=Math.min(na.c,v.c),C=Math.max(na.f,v.f),na=Math.min(na.b,v.b),$d=J;$d<=Fa;++$d)for(cg=C;cg<=na;++cg)J=(cg-v.f)*B+($d-v.a),this.l[J]=void 0;pk(b.usedTiles,k,p,A);rk(b,k,m,e,g,z,p,h.a());mk(b,k);ok(b,k);gk(this.B,e*b.size[0]/2,e*b.size[1]/2,e*r/f.resolution,e*r/f.resolution,f.rotation,(Qc[0]-x[0])/r,(x[1]-Qc[1])/r);this.g=null;return!0};
+Pp.prototype.vc=function(b,c,d,e){if(this.j&&(this.g||(this.g=Bd(),Hd(this.B,this.g)),b=xm(b,this.g),0<this.j.getImageData(b[0],b[1],1,1).data[3]))return d.call(e,this.a)};function Qp(b){um.call(this,b);this.c=!1;this.o=-1;this.l=NaN;this.i=Md();this.b=this.j=null;this.g=Ni()}y(Qp,um);
+Qp.prototype.G=function(b,c,d){var e=b.extent,f=b.pixelRatio,g=c.Bb?b.skippedFeatureUids:{},h=b.viewState,k=h.projection,h=h.rotation,m=k.J(),n=this.a.ea(),p=wm(this,b,0);vm(this,"precompose",d,b,p);var q=this.b;if(q&&!q.La()){var r;cd(this.a,"render")?(this.g.canvas.width=d.canvas.width,this.g.canvas.height=d.canvas.height,r=this.g):r=d;var t=r.globalAlpha;r.globalAlpha=c.opacity;q.b(r,f,p,h,g);if(n.O&&k.b&&!Vd(m,e)){c=e[0];k=je(m);for(n=0;c<m[0];)--n,p=k*n,p=wm(this,b,p),q.b(r,f,p,h,g),c+=k;n=0;
+for(c=e[2];c>m[2];)++n,p=k*n,p=wm(this,b,p),q.b(r,f,p,h,g),c-=k;p=wm(this,b,0)}r!=d&&(vm(this,"render",r,b,p),d.drawImage(r.canvas,0,0));r.globalAlpha=t}vm(this,"postcompose",d,b,p)};Qp.prototype.ab=function(b,c,d,e){if(this.b){var f=c.viewState.resolution,g=c.viewState.rotation,h=this.a,k=c.layerStates[w(h)],m={};return this.b.c(b,f,g,k.Bb?c.skippedFeatureUids:{},function(b){var c=w(b).toString();if(!(c in m))return m[c]=!0,d.call(e,b,h)})}};Qp.prototype.B=function(){kk(this)};
+Qp.prototype.Ad=function(b){function c(b){var c,e=b.ac();e?c=e.call(b,n):(e=d.b)&&(c=e(b,n));if(c){if(c){e=!1;if(ga(c))for(var f=0,g=c.length;f<g;++f)e=Vm(r,b,c[f],Um(n,p),this.B,this)||e;else e=Vm(r,b,c,Um(n,p),this.B,this)||e;b=e}else b=!1;this.c=this.c||b}}var d=this.a,e=d.ea();nk(b.attributions,e.i);ok(b,e);var f=b.viewHints[0],g=b.viewHints[1],h=d.j,k=d.l;if(!this.c&&!h&&f||!k&&g)return!0;var m=b.extent,k=b.viewState,f=k.projection,n=k.resolution,p=b.pixelRatio,g=d.f,q=d.a,h=fm(d);void 0===h&&
+(h=Tm);m=Qd(m,q*n);q=k.projection.J();e.O&&k.projection.b&&!Vd(q,b.extent)&&(b=Math.max(je(m)/2,je(q)),m[0]=q[0]-b,m[2]=q[2]+b);if(!this.c&&this.l==n&&this.o==g&&this.j==h&&Vd(this.i,m))return!0;sc(this.b);this.b=null;this.c=!1;var r=new Om(.5*n/p,m,n,d.a);e.Nc(m,n,f);if(h){var t=[];e.pb(m,function(b){t.push(b)},this);t.sort(h);t.forEach(c,this)}else e.pb(m,c,this);Pm(r);this.l=n;this.o=g;this.j=h;this.i=m;this.b=r;return!0};function Rp(b,c){var d=/\{z\}/g,e=/\{x\}/g,f=/\{y\}/g,g=/\{-y\}/g;return function(h){if(h)return b.replace(d,h[0].toString()).replace(e,h[1].toString()).replace(f,function(){return(-h[2]-1).toString()}).replace(g,function(){return(jg(c.f?c.f[h[0]]:null)+h[2]).toString()})}}function Sp(b,c){for(var d=b.length,e=Array(d),f=0;f<d;++f)e[f]=Rp(b[f],c);return Tp(e)}function Tp(b){return 1===b.length?b[0]:function(c,d,e){if(c)return b[nd((c[1]<<c[0])+c[2],b.length)](c,d,e)}}function Up(){}
+function Vp(b){var c=[],d=/\{(\d)-(\d)\}/.exec(b)||/\{([a-z])-([a-z])\}/.exec(b);if(d){var e=d[2].charCodeAt(0),f;for(f=d[1].charCodeAt(0);f<=e;++f)c.push(b.replace(d[0],String.fromCharCode(f)))}else c.push(b);return c};function Wp(b){Nh.call(this,{attributions:b.attributions,df:b.df,extent:b.extent,logo:b.logo,opaque:b.opaque,projection:b.projection,state:b.state?b.state:void 0,tileGrid:b.tileGrid,tilePixelRatio:b.tilePixelRatio,wrapX:b.wrapX});this.tileLoadFunction=b.tileLoadFunction;this.tileUrlFunction=b.tileUrlFunction?b.tileUrlFunction:Up;this.urls=null;b.urls?b.tileUrlFunction?this.urls=b.urls:this.Wa(b.urls):b.url&&this.Va(b.url);b.tileUrlFunction&&this.Ja(b.tileUrlFunction)}y(Wp,Nh);l=Wp.prototype;
+l.Xa=function(){return this.tileLoadFunction};l.Ya=function(){return this.tileUrlFunction};l.Za=function(){return this.urls};l.sh=function(b){b=b.target;switch(b.state){case 1:this.s(new Qh("tileloadstart",b));break;case 2:this.s(new Qh("tileloadend",b));break;case 3:this.s(new Qh("tileloaderror",b))}};l.eb=function(b){this.a.clear();this.tileLoadFunction=b;this.u()};l.Ja=function(b){this.a.clear();this.tileUrlFunction=b;this.u()};l.Va=function(b){this.Ja(Sp(Vp(b),this.tileGrid));this.urls=[b]};
+l.Wa=function(b){this.Ja(Sp(b,this.tileGrid));this.urls=b};l.Yf=function(b,c,d){b=this.Ab(b,c,d);qh(this.a,b)&&this.a.get(b)};function Xp(b){Wp.call(this,{attributions:b.attributions,df:128,extent:b.extent,logo:b.logo,opaque:b.opaque,projection:b.projection,state:b.state?b.state:void 0,tileGrid:b.tileGrid,tileLoadFunction:b.tileLoadFunction?b.tileLoadFunction:Yp,tileUrlFunction:b.tileUrlFunction,tilePixelRatio:b.tilePixelRatio,url:b.url,urls:b.urls,wrapX:void 0===b.wrapX?!0:b.wrapX});this.g=b.format?b.format:null;this.tileClass=b.tileClass?b.tileClass:Co}y(Xp,Wp);
+Xp.prototype.Pb=function(b,c,d,e,f){var g=this.Ab(b,c,d);if(qh(this.a,g))return this.a.get(g);b=[b,c,d];e=(c=Ph(this,b,f))?this.tileUrlFunction(c,e,f):void 0;f=new this.tileClass(b,void 0!==e?0:4,void 0!==e?e:"",this.g,this.tileLoadFunction,f);D(f,"change",this.sh,!1,this);this.a.set(g,f);return f};function Yp(b,c){b.ai(sp(c,b.j))};function Zp(b){um.call(this,b);this.c=Ni();this.b=!1;this.g=[];this.i=Md();this.l=[NaN,NaN];this.o=Bd()}y(Zp,um);
+Zp.prototype.G=function(b,c,d){var e=b.pixelRatio,f=c.Bb?b.skippedFeatureUids:{},g=b.viewState,h=g.center,k=g.projection,m=g.resolution,n=g.rotation,p=this.a,q=p.ea(),r=wm(this,b,0);vm(this,"precompose",d,b,r);cd(p,"render")?(this.c.canvas.width=d.canvas.width,this.c.canvas.height=d.canvas.height,p=this.c):p=d;var t=p.globalAlpha;p.globalAlpha=c.opacity;c=this.g;var x=q.tileGrid,z,A,B,v,L,M;A=0;for(B=c.length;A<B;++A)v=c[A],z=v.a[0],L=x.Ka(z),M=q.Qb(z,e,k),L=M[0]/md(L,this.l)[0],z=x.$(z),z/=L,"tile-pixels"==
+v.b.f&&(r=ge(x.Aa(v.a,this.i)),r=gk(this.o,e*b.size[0]/2,e*b.size[1]/2,e*z/m,e*z/m,g.rotation,(r[0]-h[0])/z,(h[1]-r[1])/z)),v.c.Hd.b(p,e,r,n,f);r=wm(this,b,0);p!=d&&(vm(this,"render",p,b,r),d.drawImage(p.canvas,0,0));p.globalAlpha=t;vm(this,"postcompose",d,b,r)};
+function $p(b,c,d,e){function f(b){var c,e=b.ac();e?c=e.call(b,t):(e=d.b)&&(c=e(b,t));if(c){ga(c)||(c=[c]);var e=z,f=x;if(c){var g=!1;if(ga(c))for(var h=0,m=c.length;h<m;++h)g=Vm(f,b,c[h],e,this.j,this)||g;else g=Vm(f,b,c,e,this.j,this)||g;b=g}else b=!1;this.b=this.b||b;k.kd=k.kd||b}}var g=d.f,h=fm(d)||null,k=c.c;if(k.kd||k.Rh!=g||k.Tf!=h){sc(k.Hd);k.Hd=null;k.kd=!1;var m=d.ea(),n=m.tileGrid,p=c.a,q="tile-pixels"==c.b.f,r;q?(r=m.Qb(p[0],e,c.b),r=[0,0,r[0],r[1]]):r=n.Aa(p);var t=n.$(p[0]),m=q?m.v:
+t;k.kd=!1;var x=new Om(0,r,m,d.a),z=Um(m,e);c=c.i;h&&h!==k.Tf&&c.sort(h);c.forEach(f,b);Pm(x);k.Rh=g;k.Tf=h;k.Hd=x}}
+Zp.prototype.ab=function(b,c,d,e){var f=c.viewState.resolution,g=c.viewState.rotation,h=this.a,k=c.layerStates[w(h)],m={},n=this.g,p=h.ea(),q=p.tileGrid,r,t,x,z,A,B;x=0;for(z=n.length;x<z;++x)B=n[x],t=B.a,A=p.tileGrid.Aa(t,this.i),Td(A,b)&&("tile-pixels"===B.b.f?(A=ge(A),f=p.v,t=q.$(t[0])/f,t=[(b[0]-A[0])/t,(A[1]-b[1])/t]):t=b,B=B.c.Hd,r=r||B.c(t,f,g,k.Bb?c.skippedFeatureUids:{},function(b){var c=w(b).toString();if(!(c in m))return m[c]=!0,d.call(e,b,h)}));return r};Zp.prototype.j=function(){kk(this)};
+Zp.prototype.Ad=function(b,c){var d=this.a,e=d.ea();nk(b.attributions,e.i);ok(b,e);var f=b.viewHints[0],g=b.viewHints[1],h=d.j,k=d.l;if(!this.b&&!h&&f||!k&&g)return!0;g=b.extent;c.extent&&(g=ne(g,c.extent));if(ie(g))return!1;for(var f=b.viewState,h=f.projection,k=f.resolution,f=b.pixelRatio,m=e.tileGrid,n=m.a,p=n.length-1;0<p&&n[p]<k;)--p;n=Dh(m,g,p);pk(b.usedTiles,e,p,n);rk(b,e,m,f,h,g,p,d.g());mk(b,e);g={};g[p]={};var q=this.cd(e,h,g),r=d.U(),t=this.i,x=new fg(0,0,0,0),z,A,B;for(A=n.a;A<=n.c;++A)for(B=
+n.f;B<=n.b;++B)k=e.Pb(p,A,B,f,h),z=k.state,2==z||4==z||3==z&&!r?g[p][eg(k.a)]=k:(z=Ch(m,k.a,q,x,t),z||(k=Eh(m,k.a,x,t))&&q(p+1,k));this.b=!1;e=Object.keys(g).map(Number);e.sort(ub);for(var h=[],v,m=0,p=e.length;m<p;++m)for(v in k=e[m],n=g[k],n)k=n[v],2==k.state&&(h.push(k),$p(this,k,d,f));this.g=h;return!0};function aq(b,c){xk.call(this,0,c);this.b=Ni();this.a=this.b.canvas;this.a.style.width="100%";this.a.style.height="100%";this.a.className="ol-unselectable";Lg(b,this.a,0);this.f=!0;this.g=Bd()}y(aq,xk);aq.prototype.hf=function(b){return b instanceof Pl?new Op(b):b instanceof G?new Pp(b):b instanceof I?new Zp(b):b instanceof H?new Qp(b):null};
+function bq(b,c,d){var e=b.i,f=b.b;if(cd(e,c)){var g=d.extent,h=d.pixelRatio,k=d.viewState.rotation,m=d.pixelRatio,n=d.viewState,p=n.resolution;b=gk(b.g,b.a.width/2,b.a.height/2,m/p,-m/p,-n.rotation,-n.center[0],-n.center[1]);g=new gm(f,h,g,b,k);e.s(new bk(c,e,g,d,f,null));tm(g)}}aq.prototype.W=function(){return"canvas"};
+aq.prototype.Ne=function(b){if(b){var c=this.b,d=b.size[0]*b.pixelRatio,e=b.size[1]*b.pixelRatio;this.a.width!=d||this.a.height!=e?(this.a.width=d,this.a.height=e):c.clearRect(0,0,this.a.width,this.a.height);yk(b);bq(this,"precompose",b);d=b.layerStatesArray;pb(d);var e=b.viewState.resolution,f,g,h,k;f=0;for(g=d.length;f<g;++f)k=d[f],h=k.layer,h=Ak(this,h),dk(k,e)&&"ready"==k.O&&h.Ad(b,k)&&h.G(b,k,c);bq(this,"postcompose",b);this.f||(gh(this.a,!0),this.f=!0);Bk(this,b);b.postRenderFunctions.push(zk)}else this.f&&
+(gh(this.a,!1),this.f=!1)};function cq(b,c){jk.call(this,b);this.target=c}y(cq,jk);cq.prototype.g=za;cq.prototype.l=za;function dq(b){var c=document.createElement("DIV");c.style.position="absolute";cq.call(this,b,c);this.b=null;this.c=Dd()}y(dq,cq);dq.prototype.ab=function(b,c,d,e){var f=this.a;return f.ea().ye(b,c.viewState.resolution,c.viewState.rotation,c.skippedFeatureUids,function(b){return d.call(e,b,f)})};dq.prototype.g=function(){Kg(this.target);this.b=null};
+dq.prototype.i=function(b,c){var d=b.viewState,e=d.center,f=d.resolution,g=d.rotation,h=this.b,k=this.a.ea(),m=b.viewHints,n=b.extent;void 0!==c.extent&&(n=ne(n,c.extent));m[0]||m[1]||ie(n)||(d=k.C(n,f,b.pixelRatio,d.projection))&&lk(this,d)&&(h=d);h&&(m=h.J(),n=h.$(),d=Bd(),gk(d,b.size[0]/2,b.size[1]/2,n/f,n/f,g,(m[0]-e[0])/n,(e[1]-m[3])/n),h!=this.b&&(e=h.a(this),e.style.maxWidth="none",e.style.position="absolute",Kg(this.target),this.target.appendChild(e),this.b=h),hk(d,this.c)||(Ri(this.target,
+d),Ed(this.c,d)),nk(b.attributions,h.i),ok(b,k));return!0};function eq(b){var c=document.createElement("DIV");c.style.position="absolute";cq.call(this,b,c);this.c=!0;this.o=1;this.j=0;this.b={}}y(eq,cq);eq.prototype.g=function(){Kg(this.target);this.j=0};
+eq.prototype.i=function(b,c){if(!c.visible)return this.c&&(gh(this.target,!1),this.c=!1),!0;var d=b.pixelRatio,e=b.viewState,f=e.projection,g=this.a,h=g.ea(),k=h.ib(f),m=h.ae(),n=Ih(k,e.resolution),p=k.$(n),q=e.center,r;p==e.resolution?(q=qk(q,p,b.size),r=me(q,p,e.rotation,b.size)):r=b.extent;void 0!==c.extent&&(r=ne(r,c.extent));var p=Fh(k,r,p),t={};t[n]={};var x=this.cd(h,f,t),z=g.b(),A=Md(),B=new fg(0,0,0,0),v,L,M,J;for(M=p.a;M<=p.c;++M)for(J=p.f;J<=p.b;++J)v=h.Pb(n,M,J,d,f),L=v.state,L=2==L||
+4==L||3==L&&!z,!L&&v.f&&(v=v.f),L=v.state,2==L?t[n][eg(v.a)]=v:4==L||3==L&&!z||(L=Ch(k,v.a,x,B,A),L||(v=Eh(k,v.a,B,A))&&x(n+1,v));var C;if(this.j!=h.f){for(C in this.b)z=this.b[+C],Mg(z.target);this.b={};this.j=h.f}A=Object.keys(t).map(Number);A.sort(ub);var x={},sa;M=0;for(J=A.length;M<J;++M){C=A[M];C in this.b?z=this.b[C]:(z=k.ge(q,C),z=new fq(k,z),x[C]=!0,this.b[C]=z);C=t[C];for(sa in C){v=z;L=C[sa];var la=m,K=L.a,ma=K[0],Ua=K[1],Nb=K[2],K=eg(K);if(!(K in v.f)){var ma=md(v.g.Ka(ma),v.l),na=L.Ta(v),
+Fa=na.style;Fa.maxWidth="none";var ad=void 0,Qc=void 0;0<la?(ad=document.createElement("DIV"),Qc=ad.style,Qc.overflow="hidden",Qc.width=ma[0]+"px",Qc.height=ma[1]+"px",Fa.position="absolute",Fa.left=-la+"px",Fa.top=-la+"px",Fa.width=ma[0]+2*la+"px",Fa.height=ma[1]+2*la+"px",ad.appendChild(na)):(Fa.width=ma[0]+"px",Fa.height=ma[1]+"px",ad=na,Qc=Fa);Qc.position="absolute";Qc.left=(Ua-v.b[1])*ma[0]+"px";Qc.top=(v.b[2]-Nb)*ma[1]+"px";v.a||(v.a=document.createDocumentFragment());v.a.appendChild(ad);v.f[K]=
+L}}z.a&&(z.target.appendChild(z.a),z.a=null)}m=Object.keys(this.b).map(Number);m.sort(ub);M=Bd();sa=0;for(A=m.length;sa<A;++sa)if(C=m[sa],z=this.b[C],C in t)if(v=z.$(),J=z.Da(),gk(M,b.size[0]/2,b.size[1]/2,v/e.resolution,v/e.resolution,e.rotation,(J[0]-q[0])/v,(q[1]-J[1])/v),z.setTransform(M),C in x){for(--C;0<=C;--C)if(C in this.b){J=this.b[C].target;J.parentNode&&J.parentNode.insertBefore(z.target,J.nextSibling);break}0>C&&Lg(this.target,z.target,0)}else{if(!b.viewHints[0]&&!b.viewHints[1]){L=Dh(z.g,
+r,z.b[0],B);C=[];v=J=void 0;for(v in z.f)J=z.f[v],L.contains(J.a)||C.push(J);la=L=void 0;L=0;for(la=C.length;L<la;++L)J=C[L],v=eg(J.a),Mg(J.Ta(z)),delete z.f[v]}}else Mg(z.target),delete this.b[C];c.opacity!=this.o&&(this.o=this.target.style.opacity=c.opacity);c.visible&&!this.c&&(gh(this.target,!0),this.c=!0);pk(b.usedTiles,h,n,p);rk(b,h,k,d,f,r,n,g.a());mk(b,h);ok(b,h);return!0};
+function fq(b,c){this.target=document.createElement("DIV");this.target.style.position="absolute";this.target.style.width="100%";this.target.style.height="100%";this.g=b;this.b=c;this.i=ge(b.Aa(c));this.j=b.$(c[0]);this.f={};this.a=null;this.c=Dd();this.l=[0,0]}fq.prototype.Da=function(){return this.i};fq.prototype.$=function(){return this.j};fq.prototype.setTransform=function(b){hk(b,this.c)||(Ri(this.target,b),Ed(this.c,b))};function gq(b){this.j=Ni();var c=this.j.canvas;c.style.maxWidth="none";c.style.position="absolute";cq.call(this,b,c);this.c=!1;this.v=-1;this.B=NaN;this.o=Md();this.b=this.G=null;this.O=Bd();this.D=Bd()}y(gq,cq);
+gq.prototype.l=function(b,c){var d=b.viewState,e=d.center,f=d.rotation,g=d.resolution,d=b.pixelRatio,h=b.size[0],k=b.size[1],m=h*d,n=k*d,e=gk(this.O,d*h/2,d*k/2,d/g,-d/g,-f,-e[0],-e[1]),g=this.j;g.canvas.width=m;g.canvas.height=n;h=gk(this.D,0,0,1/d,1/d,0,-(m-h)/2*d,-(n-k)/2*d);Ri(g.canvas,h);hq(this,"precompose",b,e);(h=this.b)&&!h.La()&&(g.globalAlpha=c.opacity,h.b(g,d,e,f,c.Bb?b.skippedFeatureUids:{}),hq(this,"render",b,e));hq(this,"postcompose",b,e)};
+function hq(b,c,d,e){var f=b.j;b=b.a;cd(b,c)&&(e=new gm(f,d.pixelRatio,d.extent,e,d.viewState.rotation),b.s(new bk(c,b,e,d,f,null)),tm(e))}gq.prototype.ab=function(b,c,d,e){if(this.b){var f=c.viewState.resolution,g=c.viewState.rotation,h=this.a,k=c.layerStates[w(h)],m={};return this.b.c(b,f,g,k.Bb?c.skippedFeatureUids:{},function(b){var c=w(b).toString();if(!(c in m))return m[c]=!0,d.call(e,b,h)})}};gq.prototype.C=function(){kk(this)};
+gq.prototype.i=function(b){function c(b){var c,e=b.ac();e?c=e.call(b,m):(e=d.b)&&(c=e(b,m));if(c){if(c){e=!1;if(ga(c))for(var f=0,g=c.length;f<g;++f)e=Vm(p,b,c[f],Um(m,n),this.C,this)||e;else e=Vm(p,b,c,Um(m,n),this.C,this)||e;b=e}else b=!1;this.c=this.c||b}}var d=this.a,e=d.ea();nk(b.attributions,e.i);ok(b,e);var f=b.viewHints[0],g=b.viewHints[1],h=d.j,k=d.l;if(!this.c&&!h&&f||!k&&g)return!0;var g=b.extent,h=b.viewState,f=h.projection,m=h.resolution,n=b.pixelRatio;b=d.f;k=d.a;h=fm(d);void 0===h&&
+(h=Tm);g=Qd(g,k*m);if(!this.c&&this.B==m&&this.v==b&&this.G==h&&Vd(this.o,g))return!0;sc(this.b);this.b=null;this.c=!1;var p=new Om(.5*m/n,g,m,d.a);e.Nc(g,m,f);if(h){var q=[];e.pb(g,function(b){q.push(b)},this);q.sort(h);q.forEach(c,this)}else e.pb(g,c,this);Pm(p);this.B=m;this.v=b;this.G=h;this.o=g;this.b=p;return!0};function iq(b,c){xk.call(this,0,c);this.b=Ni();var d=this.b.canvas;d.style.position="absolute";d.style.width="100%";d.style.height="100%";d.className="ol-unselectable";Lg(b,d,0);this.g=Bd();this.a=document.createElement("DIV");this.a.className="ol-unselectable";d=this.a.style;d.position="absolute";d.width="100%";d.height="100%";D(this.a,"touchstart",vc);Lg(b,this.a,0);this.f=!0}y(iq,xk);iq.prototype.Y=function(){Mg(this.a);iq.ca.Y.call(this)};
+iq.prototype.hf=function(b){if(b instanceof Pl)b=new dq(b);else if(b instanceof G)b=new eq(b);else if(b instanceof H)b=new gq(b);else return null;return b};function jq(b,c,d){var e=b.i;if(cd(e,c)){var f=d.extent,g=d.pixelRatio,h=d.viewState,k=h.rotation,m=b.b,n=m.canvas;gk(b.g,n.width/2,n.height/2,g/h.resolution,-g/h.resolution,-h.rotation,-h.center[0],-h.center[1]);b=new gm(m,g,f,b.g,k);e.s(new bk(c,e,b,d,m,null));tm(b)}}iq.prototype.W=function(){return"dom"};
+iq.prototype.Ne=function(b){if(b){var c=this.i;if(cd(c,"precompose")||cd(c,"postcompose")){var c=this.b.canvas,d=b.pixelRatio;c.width=b.size[0]*d;c.height=b.size[1]*d}jq(this,"precompose",b);c=b.layerStatesArray;pb(c);var d=b.viewState.resolution,e,f,g,h;e=0;for(f=c.length;e<f;++e)h=c[e],g=h.layer,g=Ak(this,g),Lg(this.a,g.target,e),dk(h,d)&&"ready"==h.O?g.i(b,h)&&g.l(b,h):g.g();var c=b.layerStates,k;for(k in this.c)k in c||(g=this.c[k],Mg(g.target));this.f||(gh(this.a,!0),this.f=!0);yk(b);Bk(this,
+b);b.postRenderFunctions.push(zk);jq(this,"postcompose",b)}else this.f&&(gh(this.a,!1),this.f=!1)};function kq(b){this.a=b}function lq(b){this.a=b}y(lq,kq);lq.prototype.W=function(){return 35632};function mq(b){this.a=b}y(mq,kq);mq.prototype.W=function(){return 35633};function nq(){this.a="precision mediump float;varying vec2 a;varying float b;uniform float k;uniform sampler2D l;void main(void){vec4 texColor=texture2D(l,a);gl_FragColor.rgb=texColor.rgb;float alpha=texColor.a*b*k;if(alpha==0.0){discard;}gl_FragColor.a=alpha;}"}y(nq,lq);ea(nq);
+function oq(){this.a="varying vec2 a;varying float b;attribute vec2 c;attribute vec2 d;attribute vec2 e;attribute float f;attribute float g;uniform mat4 h;uniform mat4 i;uniform mat4 j;void main(void){mat4 offsetMatrix=i;if(g==1.0){offsetMatrix=i*j;}vec4 offsets=offsetMatrix*vec4(e,0.,0.);gl_Position=h*vec4(c,0.,1.)+offsets;a=d;b=f;}"}y(oq,mq);ea(oq);
+function pq(b,c){this.l=b.getUniformLocation(c,"j");this.o=b.getUniformLocation(c,"i");this.i=b.getUniformLocation(c,"k");this.j=b.getUniformLocation(c,"h");this.a=b.getAttribLocation(c,"e");this.f=b.getAttribLocation(c,"f");this.c=b.getAttribLocation(c,"c");this.b=b.getAttribLocation(c,"g");this.g=b.getAttribLocation(c,"d")};function qq(b){this.a=void 0!==b?b:[]};function rq(b,c){this.G=b;this.a=c;this.f={};this.i={};this.g={};this.l=this.o=this.c=this.j=null;(this.b=vb(ya,"OES_element_index_uint"))&&c.getExtension("OES_element_index_uint");D(this.G,"webglcontextlost",this.Hn,!1,this);D(this.G,"webglcontextrestored",this.In,!1,this)}
+function sq(b,c,d){var e=b.a,f=d.a,g=w(d);if(g in b.f)e.bindBuffer(c,b.f[g].buffer);else{var h=e.createBuffer();e.bindBuffer(c,h);var k;34962==c?k=new Float32Array(f):34963==c&&(k=b.b?new Uint32Array(f):new Uint16Array(f));e.bufferData(c,k,35044);b.f[g]={Fb:d,buffer:h}}}function tq(b,c){var d=b.a,e=w(c),f=b.f[e];d.isContextLost()||d.deleteBuffer(f.buffer);delete b.f[e]}l=rq.prototype;
+l.Y=function(){var b=this.a;b.isContextLost()||(Ib(this.f,function(c){b.deleteBuffer(c.buffer)}),Ib(this.g,function(c){b.deleteProgram(c)}),Ib(this.i,function(c){b.deleteShader(c)}),b.deleteFramebuffer(this.c),b.deleteRenderbuffer(this.l),b.deleteTexture(this.o))};l.Gn=function(){return this.a};
+function uq(b){if(!b.c){var c=b.a,d=c.createFramebuffer();c.bindFramebuffer(c.FRAMEBUFFER,d);var e=vq(c,1,1),f=c.createRenderbuffer();c.bindRenderbuffer(c.RENDERBUFFER,f);c.renderbufferStorage(c.RENDERBUFFER,c.DEPTH_COMPONENT16,1,1);c.framebufferTexture2D(c.FRAMEBUFFER,c.COLOR_ATTACHMENT0,c.TEXTURE_2D,e,0);c.framebufferRenderbuffer(c.FRAMEBUFFER,c.DEPTH_ATTACHMENT,c.RENDERBUFFER,f);c.bindTexture(c.TEXTURE_2D,null);c.bindRenderbuffer(c.RENDERBUFFER,null);c.bindFramebuffer(c.FRAMEBUFFER,null);b.c=d;
+b.o=e;b.l=f}return b.c}function wq(b,c){var d=w(c);if(d in b.i)return b.i[d];var e=b.a,f=e.createShader(c.W());e.shaderSource(f,c.a);e.compileShader(f);return b.i[d]=f}function xq(b,c,d){var e=w(c)+"/"+w(d);if(e in b.g)return b.g[e];var f=b.a,g=f.createProgram();f.attachShader(g,wq(b,c));f.attachShader(g,wq(b,d));f.linkProgram(g);return b.g[e]=g}l.Hn=function(){Qb(this.f);Qb(this.i);Qb(this.g);this.l=this.o=this.c=this.j=null};l.In=function(){};
+l.He=function(b){if(b==this.j)return!1;this.a.useProgram(b);this.j=b;return!0};function yq(b,c,d){var e=b.createTexture();b.bindTexture(b.TEXTURE_2D,e);b.texParameteri(b.TEXTURE_2D,b.TEXTURE_MAG_FILTER,b.LINEAR);b.texParameteri(b.TEXTURE_2D,b.TEXTURE_MIN_FILTER,b.LINEAR);void 0!==c&&b.texParameteri(3553,10242,c);void 0!==d&&b.texParameteri(3553,10243,d);return e}function vq(b,c,d){var e=yq(b,void 0,void 0);b.texImage2D(b.TEXTURE_2D,0,b.RGBA,c,d,0,b.RGBA,b.UNSIGNED_BYTE,null);return e}
+function zq(b,c){var d=yq(b,33071,33071);b.texImage2D(b.TEXTURE_2D,0,b.RGBA,b.RGBA,b.UNSIGNED_BYTE,c);return d};function Aq(b,c){this.D=this.C=void 0;this.o=le(c);this.v=[];this.i=[];this.na=void 0;this.g=[];this.c=[];this.U=this.va=void 0;this.f=[];this.O=this.l=null;this.T=void 0;this.hb=Dd();this.Db=Dd();this.fa=this.V=void 0;this.Eb=Dd();this.gb=this.oa=this.ga=void 0;this.wa=[];this.j=[];this.a=[];this.B=null;this.b=[];this.G=[];this.pa=void 0}y(Aq,ak);
+function Bq(b,c){var d=b.B,e=b.l,f=b.wa,g=b.j,h=c.a;return function(){if(!h.isContextLost()){var b,m;b=0;for(m=f.length;b<m;++b)h.deleteTexture(f[b]);b=0;for(m=g.length;b<m;++b)h.deleteTexture(g[b])}tq(c,d);tq(c,e)}}
+function Cq(b,c,d,e){var f=b.C,g=b.D,h=b.na,k=b.va,m=b.U,n=b.T,p=b.V,q=b.fa,r=b.ga?1:0,t=b.oa,x=b.gb,z=b.pa,A=Math.cos(t),t=Math.sin(t),B=b.f.length,v=b.a.length,L,M,J,C,sa,la;for(L=0;L<d;L+=e)sa=c[L]-b.o[0],la=c[L+1]-b.o[1],M=v/8,J=-x*f,C=-x*(h-g),b.a[v++]=sa,b.a[v++]=la,b.a[v++]=J*A-C*t,b.a[v++]=J*t+C*A,b.a[v++]=p/m,b.a[v++]=(q+h)/k,b.a[v++]=n,b.a[v++]=r,J=x*(z-f),C=-x*(h-g),b.a[v++]=sa,b.a[v++]=la,b.a[v++]=J*A-C*t,b.a[v++]=J*t+C*A,b.a[v++]=(p+z)/m,b.a[v++]=(q+h)/k,b.a[v++]=n,b.a[v++]=r,J=x*(z-
+f),C=x*g,b.a[v++]=sa,b.a[v++]=la,b.a[v++]=J*A-C*t,b.a[v++]=J*t+C*A,b.a[v++]=(p+z)/m,b.a[v++]=q/k,b.a[v++]=n,b.a[v++]=r,J=-x*f,C=x*g,b.a[v++]=sa,b.a[v++]=la,b.a[v++]=J*A-C*t,b.a[v++]=J*t+C*A,b.a[v++]=p/m,b.a[v++]=q/k,b.a[v++]=n,b.a[v++]=r,b.f[B++]=M,b.f[B++]=M+1,b.f[B++]=M+2,b.f[B++]=M,b.f[B++]=M+2,b.f[B++]=M+3}Aq.prototype.Gb=function(b,c){this.b.push(this.f.length);this.G.push(c);var d=b.ia();Cq(this,d,d.length,b.ra())};
+Aq.prototype.Hb=function(b,c){this.b.push(this.f.length);this.G.push(c);var d=b.ia();Cq(this,d,d.length,b.ra())};function Dq(b,c){var d=c.a;b.v.push(b.f.length);b.i.push(b.f.length);b.B=new qq(b.a);sq(c,34962,b.B);b.l=new qq(b.f);sq(c,34963,b.l);var e={};Eq(b.wa,b.g,e,d);Eq(b.j,b.c,e,d);b.C=void 0;b.D=void 0;b.na=void 0;b.g=null;b.c=null;b.va=void 0;b.U=void 0;b.f=null;b.T=void 0;b.V=void 0;b.fa=void 0;b.ga=void 0;b.oa=void 0;b.gb=void 0;b.a=null;b.pa=void 0}
+function Eq(b,c,d,e){var f,g,h,k=c.length;for(h=0;h<k;++h)f=c[h],g=w(f).toString(),g in d?f=d[g]:(f=zq(e,f),d[g]=f),b[h]=f}
+function Fq(b,c,d,e,f,g,h,k,m,n,p){var q=c.a;sq(c,34962,b.B);sq(c,34963,b.l);var r=nq.Yb(),t=oq.Yb(),t=xq(c,r,t);b.O?r=b.O:(r=new pq(q,t),b.O=r);c.He(t);q.enableVertexAttribArray(r.c);q.vertexAttribPointer(r.c,2,5126,!1,32,0);q.enableVertexAttribArray(r.a);q.vertexAttribPointer(r.a,2,5126,!1,32,8);q.enableVertexAttribArray(r.g);q.vertexAttribPointer(r.g,2,5126,!1,32,16);q.enableVertexAttribArray(r.f);q.vertexAttribPointer(r.f,1,5126,!1,32,24);q.enableVertexAttribArray(r.b);q.vertexAttribPointer(r.b,
+1,5126,!1,32,28);t=b.Eb;gk(t,0,0,2/(e*g[0]),2/(e*g[1]),-f,-(d[0]-b.o[0]),-(d[1]-b.o[1]));d=b.Db;e=2/g[0];g=2/g[1];Fd(d);d[0]=e;d[5]=g;d[10]=1;d[15]=1;g=b.hb;Fd(g);0!==f&&Kd(g,-f);q.uniformMatrix4fv(r.j,!1,t);q.uniformMatrix4fv(r.o,!1,d);q.uniformMatrix4fv(r.l,!1,g);q.uniform1f(r.i,h);var x;if(void 0===m)Gq(b,q,c,k,b.wa,b.v);else{if(n)a:{f=c.b?5125:5123;c=c.b?4:2;g=b.b.length-1;for(h=b.j.length-1;0<=h;--h)for(q.bindTexture(3553,b.j[h]),n=0<h?b.i[h-1]:0,t=b.i[h];0<=g&&b.b[g]>=n;){x=b.b[g];d=b.G[g];
+e=w(d).toString();if(void 0===k[e]&&d.X()&&(void 0===p||oe(p,d.X().J()))&&(q.clear(q.COLOR_BUFFER_BIT|q.DEPTH_BUFFER_BIT),q.drawElements(4,t-x,f,x*c),t=m(d))){b=t;break a}t=x;g--}b=void 0}else q.clear(q.COLOR_BUFFER_BIT|q.DEPTH_BUFFER_BIT),Gq(b,q,c,k,b.j,b.i),b=(b=m(null))?b:void 0;x=b}q.disableVertexAttribArray(r.c);q.disableVertexAttribArray(r.a);q.disableVertexAttribArray(r.g);q.disableVertexAttribArray(r.f);q.disableVertexAttribArray(r.b);return x}
+function Gq(b,c,d,e,f,g){var h=d.b?5125:5123;d=d.b?4:2;if(Pb(e)){var k;b=0;e=f.length;for(k=0;b<e;++b){c.bindTexture(3553,f[b]);var m=g[b];c.drawElements(4,m-k,h,k*d);k=m}}else{k=0;var n,m=0;for(n=f.length;m<n;++m){c.bindTexture(3553,f[m]);for(var p=0<m?g[m-1]:0,q=g[m],r=p;k<b.b.length&&b.b[k]<=q;){var t=w(b.G[k]).toString();void 0!==e[t]?(r!==p&&c.drawElements(4,p-r,h,r*d),p=r=k===b.b.length-1?q:b.b[k+1]):p=k===b.b.length-1?q:b.b[k+1];k++}r!==p&&c.drawElements(4,p-r,h,r*d)}}}
+Aq.prototype.ub=function(b){var c=b.Xb(),d=b.gc(1),e=b.rd(),f=b.Ae(1),g=b.B,h=b.Da(),k=b.C,m=b.G,n=b.Cb();b=b.j;var p;0===this.g.length?this.g.push(d):(p=this.g[this.g.length-1],w(p)!=w(d)&&(this.v.push(this.f.length),this.g.push(d)));0===this.c.length?this.c.push(f):(p=this.c[this.c.length-1],w(p)!=w(f)&&(this.i.push(this.f.length),this.c.push(f)));this.C=c[0];this.D=c[1];this.na=n[1];this.va=e[1];this.U=e[0];this.T=g;this.V=h[0];this.fa=h[1];this.oa=m;this.ga=k;this.gb=b;this.pa=n[0]};
+function Hq(b,c,d){this.i=c;this.j=b;this.g=d;this.f={}}function Iq(b,c){var d=[],e;for(e in b.f)d.push(Bq(b.f[e],c));return xe.apply(null,d)}function Jq(b,c){for(var d in b.f)Dq(b.f[d],c)}Hq.prototype.a=function(b,c){var d=this.f[c];void 0===d&&(d=new Kq[c](this.j,this.i),this.f[c]=d);return d};Hq.prototype.La=function(){return Pb(this.f)};Hq.prototype.b=function(b,c,d,e,f,g,h,k){var m,n;g=0;for(m=zm.length;g<m;++g)n=this.f[zm[g]],void 0!==n&&Fq(n,b,c,d,e,f,h,k,void 0,!1)};
+function Lq(b,c,d,e,f,g,h,k,m,n){var p=Mq,q,r;for(q=zm.length-1;0<=q;--q)if(r=b.f[zm[q]],void 0!==r&&(r=Fq(r,c,d,e,f,p,g,h,k,m,n)))return r}Hq.prototype.c=function(b,c,d,e,f,g,h,k,m,n){var p=c.a;p.bindFramebuffer(p.FRAMEBUFFER,uq(c));var q;void 0!==this.g&&(q=Qd(Xd(b),e*this.g));return Lq(this,c,b,e,f,k,m,function(b){var c=new Uint8Array(4);p.readPixels(0,0,1,1,p.RGBA,p.UNSIGNED_BYTE,c);if(0<c[3]&&(b=n(b)))return b},!0,q)};
+function Nq(b,c,d,e,f,g,h){var k=d.a;k.bindFramebuffer(k.FRAMEBUFFER,uq(d));return void 0!==Lq(b,d,c,e,f,g,h,function(){var b=new Uint8Array(4);k.readPixels(0,0,1,1,k.RGBA,k.UNSIGNED_BYTE,b);return 0<b[3]},!1)}var Kq={Image:Aq},Mq=[1,1];function Oq(b,c,d,e,f,g){this.f=b;this.g=c;this.c=g;this.l=f;this.j=e;this.i=d;this.b=null;this.a={}}y(Oq,ak);l=Oq.prototype;l.md=function(b,c){var d=b.toString(),e=this.a[d];void 0!==e?e.push(c):this.a[d]=[c]};l.Gc=function(){};l.jf=function(b,c){var d=(0,c.c)(b);if(d&&oe(this.c,d.J())){var e=c.a;void 0===e&&(e=0);this.md(e,function(b){b.bb(c.g,c.b);b.ub(c.f);b.cb(c.Ca());var e=Pq[d.W()];e&&e.call(b,d,null)})}};
+l.Yd=function(b,c){var d=b.c,e,f;e=0;for(f=d.length;e<f;++e){var g=d[e],h=Pq[g.W()];h&&h.call(this,g,c)}};l.Hb=function(b,c){var d=this.f,e=(new Hq(1,this.c)).a(0,"Image");e.ub(this.b);e.Hb(b,c);Dq(e,d);Fq(e,this.f,this.g,this.i,this.j,this.l,1,{},void 0,!1);Bq(e,d)()};l.Wb=function(){};l.Hc=function(){};l.Gb=function(b,c){var d=this.f,e=(new Hq(1,this.c)).a(0,"Image");e.ub(this.b);e.Gb(b,c);Dq(e,d);Fq(e,this.f,this.g,this.i,this.j,this.l,1,{},void 0,!1);Bq(e,d)()};l.Ic=function(){};l.Jc=function(){};
+l.Ib=function(){};l.bb=function(){};l.ub=function(b){this.b=b};l.cb=function(){};var Pq={Point:Oq.prototype.Hb,MultiPoint:Oq.prototype.Gb,GeometryCollection:Oq.prototype.Yd};function Qq(){this.a="precision mediump float;varying vec2 a;uniform float f;uniform sampler2D g;void main(void){vec4 texColor=texture2D(g,a);gl_FragColor.rgb=texColor.rgb;gl_FragColor.a=texColor.a*f;}"}y(Qq,lq);ea(Qq);function Rq(){this.a="varying vec2 a;attribute vec2 b;attribute vec2 c;uniform mat4 d;uniform mat4 e;void main(void){gl_Position=e*vec4(b,0.,1.);a=(d*vec4(c,0.,1.)).st;}"}y(Rq,mq);ea(Rq);
+function Sq(b,c){this.b=b.getUniformLocation(c,"f");this.c=b.getUniformLocation(c,"e");this.i=b.getUniformLocation(c,"d");this.g=b.getUniformLocation(c,"g");this.a=b.getAttribLocation(c,"b");this.f=b.getAttribLocation(c,"c")};function Tq(b,c){jk.call(this,c);this.b=b;this.U=new qq([-1,-1,0,0,1,-1,1,0,-1,1,0,1,1,1,1,1]);this.g=this.mb=null;this.i=void 0;this.o=Bd();this.B=Dd();this.G=null}y(Tq,jk);
+function Uq(b,c,d){var e=b.b.b;if(void 0===b.i||b.i!=d){c.postRenderFunctions.push(va(function(b,c,d){b.isContextLost()||(b.deleteFramebuffer(c),b.deleteTexture(d))},e,b.g,b.mb));c=vq(e,d,d);var f=e.createFramebuffer();e.bindFramebuffer(36160,f);e.framebufferTexture2D(36160,36064,3553,c,0);b.mb=c;b.g=f;b.i=d}else e.bindFramebuffer(36160,b.g)}
+Tq.prototype.nh=function(b,c,d){Vq(this,"precompose",d,b);sq(d,34962,this.U);var e=d.a,f=Qq.Yb(),g=Rq.Yb(),f=xq(d,f,g);this.G?g=this.G:this.G=g=new Sq(e,f);d.He(f)&&(e.enableVertexAttribArray(g.a),e.vertexAttribPointer(g.a,2,5126,!1,16,0),e.enableVertexAttribArray(g.f),e.vertexAttribPointer(g.f,2,5126,!1,16,8),e.uniform1i(g.g,0));e.uniformMatrix4fv(g.i,!1,this.o);e.uniformMatrix4fv(g.c,!1,this.B);e.uniform1f(g.b,c.opacity);e.bindTexture(3553,this.mb);e.drawArrays(5,0,4);Vq(this,"postcompose",d,b)};
+function Vq(b,c,d,e){b=b.a;if(cd(b,c)){var f=e.viewState;b.s(new bk(c,b,new Oq(d,f.center,f.resolution,f.rotation,e.size,e.extent),e,null,d))}}Tq.prototype.Cf=function(){this.g=this.mb=null;this.i=void 0};function Wq(b,c){Tq.call(this,b,c);this.l=this.j=this.c=null}y(Wq,Tq);function Xq(b,c){var d=c.a();return zq(b.b.b,d)}Wq.prototype.ab=function(b,c,d,e){var f=this.a;return f.ea().ye(b,c.viewState.resolution,c.viewState.rotation,c.skippedFeatureUids,function(b){return d.call(e,b,f)})};
+Wq.prototype.Df=function(b,c){var d=this.b.b,e=b.pixelRatio,f=b.viewState,g=f.center,h=f.resolution,k=f.rotation,m=this.c,n=this.mb,p=this.a.ea(),q=b.viewHints,r=b.extent;void 0!==c.extent&&(r=ne(r,c.extent));q[0]||q[1]||ie(r)||(f=p.C(r,h,e,f.projection))&&lk(this,f)&&(m=f,n=Xq(this,f),this.mb&&b.postRenderFunctions.push(va(function(b,c){b.isContextLost()||b.deleteTexture(c)},d,this.mb)));m&&(d=this.b.g.G,Yq(this,d.width,d.height,e,g,h,k,m.J()),this.l=null,e=this.o,Fd(e),Jd(e,1,-1),Id(e,0,-1),this.c=
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+Wq.prototype.vc=function(b,c,d,e){if(this.c&&this.c.a())if(this.a.ea()instanceof Mp){if(b=b.slice(),ik(c.pixelToCoordinateMatrix,b,b),this.ab(b,c,te,this))return d.call(e,this.a)}else{var f=[this.c.a().width,this.c.a().height];if(!this.l){var g=c.size;c=Bd();Fd(c);Id(c,-1,-1);Jd(c,2/g[0],2/g[1]);Id(c,0,g[1]);Jd(c,1,-1);g=Bd();Hd(this.B,g);var h=Bd();Fd(h);Id(h,0,f[1]);Jd(h,1,-1);Jd(h,f[0]/2,f[1]/2);Id(h,1,1);var k=Bd();Gd(h,g,k);Gd(k,c,k);this.l=k}c=[0,0];ik(this.l,b,c);if(!(0>c[0]||c[0]>f[0]||0>
+c[1]||c[1]>f[1])&&(this.j||(this.j=Ni(1,1)),this.j.clearRect(0,0,1,1),this.j.drawImage(this.c.a(),c[0],c[1],1,1,0,0,1,1),0<this.j.getImageData(0,0,1,1).data[3]))return d.call(e,this.a)}};function Zq(){this.a="precision mediump float;varying vec2 a;uniform sampler2D e;void main(void){gl_FragColor=texture2D(e,a);}"}y(Zq,lq);ea(Zq);function $q(){this.a="varying vec2 a;attribute vec2 b;attribute vec2 c;uniform vec4 d;void main(void){gl_Position=vec4(b*d.xy+d.zw,0.,1.);a=c;}"}y($q,mq);ea($q);function ar(b,c){this.b=b.getUniformLocation(c,"e");this.c=b.getUniformLocation(c,"d");this.a=b.getAttribLocation(c,"b");this.f=b.getAttribLocation(c,"c")};function br(b,c){Tq.call(this,b,c);this.D=Zq.Yb();this.T=$q.Yb();this.c=null;this.C=new qq([0,0,0,1,1,0,1,1,0,1,0,0,1,1,1,0]);this.v=this.j=null;this.l=-1;this.O=[0,0]}y(br,Tq);l=br.prototype;l.Y=function(){tq(this.b.g,this.C);br.ca.Y.call(this)};l.cd=function(b,c,d){var e=this.b;return function(f,g){return Oh(b,c,f,g,function(b){var c=qh(e.f,b.$a());c&&(d[f]||(d[f]={}),d[f][b.a.toString()]=b);return c})}};l.Cf=function(){br.ca.Cf.call(this);this.c=null};
+l.Df=function(b,c,d){var e=this.b,f=d.a,g=b.viewState,h=g.projection,k=this.a,m=k.ea(),n=m.ib(h),p=Ih(n,g.resolution),q=n.$(p),r=m.Qb(p,b.pixelRatio,h),t=r[0]/md(n.Ka(p),this.O)[0],x=q/t,z=m.ae(),A=g.center,B;q==g.resolution?(A=qk(A,q,b.size),B=me(A,q,g.rotation,b.size)):B=b.extent;q=Fh(n,B,q);if(this.j&&ig(this.j,q)&&this.l==m.f)x=this.v;else{var v=[kg(q),jg(q)],L=Math.pow(2,Math.ceil(Math.log(Math.max(v[0]*r[0],v[1]*r[1]))/Math.LN2)),v=x*L,M=n.Da(p),J=M[0]+q.a*r[0]*x,x=M[1]+q.f*r[1]*x,x=[J,x,J+
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+x[1])/v-1,Ad(C,ma,Ua,Fa,K),f.uniform4fv(this.c.c,C),cr(e,M,r,z*t),f.drawArrays(5,0,4);L?(this.j=q,this.v=x,this.l=m.f):(this.v=this.j=null,this.l=-1,b.animate=!0)}pk(b.usedTiles,m,p,q);var ad=e.l;rk(b,m,n,t,h,B,p,k.a(),function(b){var c;(c=2!=b.state||qh(e.f,b.$a()))||(c=b.$a()in ad.b);c||ad.c([b,Hh(n,b.a),n.$(b.a[0]),r,z*t])},this);mk(b,m);ok(b,m);f=this.o;Fd(f);Id(f,(A[0]-x[0])/(x[2]-x[0]),(A[1]-x[1])/(x[3]-x[1]));0!==g.rotation&&Kd(f,g.rotation);Jd(f,b.size[0]*g.resolution/(x[2]-x[0]),b.size[1]*
+g.resolution/(x[3]-x[1]));Id(f,-.5,-.5);return!0};l.vc=function(b,c,d,e){if(this.g){var f=[0,0];ik(this.o,[b[0]/c.size[0],(c.size[1]-b[1])/c.size[1]],f);b=[f[0]*this.i,f[1]*this.i];c=this.b.g.a;c.bindFramebuffer(c.FRAMEBUFFER,this.g);f=new Uint8Array(4);c.readPixels(b[0],b[1],1,1,c.RGBA,c.UNSIGNED_BYTE,f);if(0<f[3])return d.call(e,this.a)}};function dr(b,c){Tq.call(this,b,c);this.l=!1;this.O=-1;this.D=NaN;this.v=Md();this.j=this.c=this.C=null}y(dr,Tq);l=dr.prototype;l.nh=function(b,c,d){this.j=c;var e=b.viewState,f=this.c;f&&!f.La()&&f.b(d,e.center,e.resolution,e.rotation,b.size,b.pixelRatio,c.opacity,c.Bb?b.skippedFeatureUids:{})};l.Y=function(){var b=this.c;b&&(Iq(b,this.b.g)(),this.c=null);dr.ca.Y.call(this)};
+l.ab=function(b,c,d,e){if(this.c&&this.j){var f=c.viewState,g=this.a,h=this.j,k={};return this.c.c(b,this.b.g,f.center,f.resolution,f.rotation,c.size,c.pixelRatio,h.opacity,h.Bb?c.skippedFeatureUids:{},function(b){var c=w(b).toString();if(!(c in k))return k[c]=!0,d.call(e,b,g)})}};l.xe=function(b,c){if(this.c&&this.j){var d=c.viewState;return Nq(this.c,b,this.b.g,d.resolution,d.rotation,this.j.opacity,c.skippedFeatureUids)}return!1};
+l.vc=function(b,c,d,e){b=b.slice();ik(c.pixelToCoordinateMatrix,b,b);if(this.xe(b,c))return d.call(e,this.a)};l.oh=function(){kk(this)};
+l.Df=function(b,c,d){function e(b){var c,d=b.ac();d?c=d.call(b,n):(d=f.b)&&(c=d(b,n));if(c){if(c){d=!1;if(ga(c))for(var e=0,g=c.length;e<g;++e)d=Vm(r,b,c[e],Um(n,p),this.oh,this)||d;else d=Vm(r,b,c,Um(n,p),this.oh,this)||d;b=d}else b=!1;this.l=this.l||b}}var f=this.a;c=f.ea();nk(b.attributions,c.i);ok(b,c);var g=b.viewHints[0],h=b.viewHints[1],k=f.j,m=f.l;if(!this.l&&!k&&g||!m&&h)return!0;var h=b.extent,k=b.viewState,g=k.projection,n=k.resolution,p=b.pixelRatio,k=f.f,q=f.a,m=fm(f);void 0===m&&(m=
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+function cr(b,c,d,e){var f=b.b,g=c.$a();if(qh(b.f,g))b=b.f.get(g),f.bindTexture(3553,b.mb),9729!=b.Sg&&(f.texParameteri(3553,10240,9729),b.Sg=9729),9729!=b.Tg&&(f.texParameteri(3553,10240,9729),b.Tg=9729);else{var h=f.createTexture();f.bindTexture(3553,h);if(0<e){var k=b.D.canvas,m=b.D;b.C!==d[0]||b.v!==d[1]?(k.width=d[0],k.height=d[1],b.C=d[0],b.v=d[1]):m.clearRect(0,0,d[0],d[1]);m.drawImage(c.Ta(),e,e,d[0],d[1],0,0,d[0],d[1]);f.texImage2D(3553,0,6408,6408,5121,k)}else f.texImage2D(3553,0,6408,6408,
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+ The Closure Authors under the MIT license. All other code is Copyright
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+*/
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+og.prototype.remove=og.prototype.remove;og.prototype.removeAt=og.prototype.Sf;og.prototype.setAt=og.prototype.Jo;u("ol.coordinate.add",pd,OPENLAYERS);u("ol.coordinate.createStringXY",function(b){return function(c){return xd(c,b)}},OPENLAYERS);u("ol.coordinate.format",sd,OPENLAYERS);u("ol.coordinate.rotate",ud,OPENLAYERS);u("ol.coordinate.toStringHDMS",function(b){return b?rd(b[1],"NS")+" "+rd(b[0],"EW"):""},OPENLAYERS);u("ol.coordinate.toStringXY",xd,OPENLAYERS);u("ol.DeviceOrientation",Mr,OPENLAYERS);
+Mr.prototype.getAlpha=Mr.prototype.Fj;Mr.prototype.getBeta=Mr.prototype.Ij;Mr.prototype.getGamma=Mr.prototype.Oj;Mr.prototype.getHeading=Mr.prototype.xl;Mr.prototype.getTracking=Mr.prototype.Vg;Mr.prototype.setTracking=Mr.prototype.vf;u("ol.easing.easeIn",Tf,OPENLAYERS);u("ol.easing.easeOut",Uf,OPENLAYERS);u("ol.easing.inAndOut",Vf,OPENLAYERS);u("ol.easing.linear",Wf,OPENLAYERS);u("ol.easing.upAndDown",Xf,OPENLAYERS);u("ol.extent.boundingExtent",Ld,OPENLAYERS);u("ol.extent.buffer",Qd,OPENLAYERS);
+u("ol.extent.containsCoordinate",Td,OPENLAYERS);u("ol.extent.containsExtent",Vd,OPENLAYERS);u("ol.extent.containsXY",Ud,OPENLAYERS);u("ol.extent.createEmpty",Md,OPENLAYERS);u("ol.extent.equals",ae,OPENLAYERS);u("ol.extent.extend",be,OPENLAYERS);u("ol.extent.getBottomLeft",de,OPENLAYERS);u("ol.extent.getBottomRight",ee,OPENLAYERS);u("ol.extent.getCenter",le,OPENLAYERS);u("ol.extent.getHeight",ke,OPENLAYERS);u("ol.extent.getIntersection",ne,OPENLAYERS);
+u("ol.extent.getSize",function(b){return[b[2]-b[0],b[3]-b[1]]},OPENLAYERS);u("ol.extent.getTopLeft",ge,OPENLAYERS);u("ol.extent.getTopRight",fe,OPENLAYERS);u("ol.extent.getWidth",je,OPENLAYERS);u("ol.extent.intersects",oe,OPENLAYERS);u("ol.extent.isEmpty",ie,OPENLAYERS);u("ol.extent.applyTransform",qe,OPENLAYERS);u("ol.Feature",pn,OPENLAYERS);pn.prototype.clone=pn.prototype.clone;pn.prototype.getGeometry=pn.prototype.X;pn.prototype.getId=pn.prototype.Oa;pn.prototype.getGeometryName=pn.prototype.Qj;
+pn.prototype.getStyle=pn.prototype.zl;pn.prototype.getStyleFunction=pn.prototype.ac;pn.prototype.setGeometry=pn.prototype.Ma;pn.prototype.setStyle=pn.prototype.wf;pn.prototype.setId=pn.prototype.jc;pn.prototype.setGeometryName=pn.prototype.yc;u("ol.featureloader.tile",sp,OPENLAYERS);u("ol.featureloader.xhr",tp,OPENLAYERS);u("ol.Geolocation",Mx,OPENLAYERS);Mx.prototype.getAccuracy=Mx.prototype.Dj;Mx.prototype.getAccuracyGeometry=Mx.prototype.Ej;Mx.prototype.getAltitude=Mx.prototype.Gj;
+Mx.prototype.getAltitudeAccuracy=Mx.prototype.Hj;Mx.prototype.getHeading=Mx.prototype.Bl;Mx.prototype.getPosition=Mx.prototype.Cl;Mx.prototype.getProjection=Mx.prototype.Wg;Mx.prototype.getSpeed=Mx.prototype.lk;Mx.prototype.getTracking=Mx.prototype.Xg;Mx.prototype.getTrackingOptions=Mx.prototype.Ig;Mx.prototype.setProjection=Mx.prototype.Yg;Mx.prototype.setTracking=Mx.prototype.re;Mx.prototype.setTrackingOptions=Mx.prototype.hi;u("ol.Graticule",Sx,OPENLAYERS);Sx.prototype.getMap=Sx.prototype.Fl;
+Sx.prototype.getMeridians=Sx.prototype.Zj;Sx.prototype.getParallels=Sx.prototype.fk;Sx.prototype.setMap=Sx.prototype.setMap;u("ol.has.DEVICE_PIXEL_RATIO",Vi,OPENLAYERS);u("ol.has.CANVAS",Xi,OPENLAYERS);u("ol.has.DEVICE_ORIENTATION",Yi,OPENLAYERS);u("ol.has.GEOLOCATION",Zi,OPENLAYERS);u("ol.has.TOUCH",$i,OPENLAYERS);u("ol.has.WEBGL",Ui,OPENLAYERS);Xx.prototype.getImage=Xx.prototype.a;Yx.prototype.getImage=Yx.prototype.Ta;u("ol.Kinetic",Jk,OPENLAYERS);u("ol.loadingstrategy.all",up,OPENLAYERS);
+u("ol.loadingstrategy.bbox",function(b){return[b]},OPENLAYERS);u("ol.loadingstrategy.tile",function(b){return function(c,d){var e=Ih(b,d),f=Dh(b,c,e),g=[],e=[e,0,0];for(e[1]=f.a;e[1]<=f.c;++e[1])for(e[2]=f.f;e[2]<=f.b;++e[2])g.push(b.Aa(e));return g}},OPENLAYERS);u("ol.Map",S,OPENLAYERS);S.prototype.addControl=S.prototype.kj;S.prototype.addInteraction=S.prototype.lj;S.prototype.addLayer=S.prototype.kg;S.prototype.addOverlay=S.prototype.lg;S.prototype.beforeRender=S.prototype.Na;
+S.prototype.forEachFeatureAtPixel=S.prototype.pd;S.prototype.forEachLayerAtPixel=S.prototype.Jl;S.prototype.hasFeatureAtPixel=S.prototype.bl;S.prototype.getEventCoordinate=S.prototype.Mj;S.prototype.getEventPixel=S.prototype.$d;S.prototype.getTarget=S.prototype.xf;S.prototype.getTargetElement=S.prototype.Mc;S.prototype.getCoordinateFromPixel=S.prototype.Ga;S.prototype.getControls=S.prototype.Kj;S.prototype.getOverlays=S.prototype.dk;S.prototype.getOverlayById=S.prototype.ck;
+S.prototype.getInteractions=S.prototype.Rj;S.prototype.getLayerGroup=S.prototype.rc;S.prototype.getLayers=S.prototype.Zg;S.prototype.getPixelFromCoordinate=S.prototype.Pa;S.prototype.getSize=S.prototype.Sa;S.prototype.getView=S.prototype.aa;S.prototype.getViewport=S.prototype.sk;S.prototype.renderSync=S.prototype.Fo;S.prototype.render=S.prototype.render;S.prototype.removeControl=S.prototype.yo;S.prototype.removeInteraction=S.prototype.zo;S.prototype.removeLayer=S.prototype.Bo;
+S.prototype.removeOverlay=S.prototype.Co;S.prototype.setLayerGroup=S.prototype.$h;S.prototype.setSize=S.prototype.Vf;S.prototype.setTarget=S.prototype.Kl;S.prototype.setView=S.prototype.To;S.prototype.updateSize=S.prototype.Vc;Kj.prototype.originalEvent=Kj.prototype.originalEvent;Kj.prototype.pixel=Kj.prototype.pixel;Kj.prototype.coordinate=Kj.prototype.coordinate;Kj.prototype.dragging=Kj.prototype.dragging;Kj.prototype.preventDefault=Kj.prototype.preventDefault;Kj.prototype.stopPropagation=Kj.prototype.b;
+nh.prototype.map=nh.prototype.map;nh.prototype.frameState=nh.prototype.frameState;fd.prototype.key=fd.prototype.key;fd.prototype.oldValue=fd.prototype.oldValue;u("ol.Object",gd,OPENLAYERS);gd.prototype.get=gd.prototype.get;gd.prototype.getKeys=gd.prototype.P;gd.prototype.getProperties=gd.prototype.R;gd.prototype.set=gd.prototype.set;gd.prototype.setProperties=gd.prototype.I;gd.prototype.unset=gd.prototype.S;u("ol.Observable",dd,OPENLAYERS);u("ol.Observable.unByKey",ed,OPENLAYERS);
+dd.prototype.changed=dd.prototype.u;dd.prototype.dispatchEvent=dd.prototype.s;dd.prototype.getRevision=dd.prototype.L;dd.prototype.on=dd.prototype.H;dd.prototype.once=dd.prototype.M;dd.prototype.un=dd.prototype.K;dd.prototype.unByKey=dd.prototype.N;u("ol.inherits",y,OPENLAYERS);u("ol.Overlay",jr,OPENLAYERS);jr.prototype.getElement=jr.prototype.se;jr.prototype.getId=jr.prototype.Oa;jr.prototype.getMap=jr.prototype.te;jr.prototype.getOffset=jr.prototype.Gg;jr.prototype.getPosition=jr.prototype.$g;
+jr.prototype.getPositioning=jr.prototype.Hg;jr.prototype.setElement=jr.prototype.Xh;jr.prototype.setMap=jr.prototype.setMap;jr.prototype.setOffset=jr.prototype.bi;jr.prototype.setPosition=jr.prototype.yf;jr.prototype.setPositioning=jr.prototype.ei;u("ol.render.toContext",function(b,c){var d=b.canvas,e=c?c:{},f=e.pixelRatio||Vi;if(e=e.size)d.width=e[0]*f,d.height=e[1]*f,d.style.width=e[0]+"px",d.style.height=e[1]+"px";d=[0,0,d.width,d.height];e=gk(Bd(),0,0,f,f,0,0,0);return new gm(b,f,d,e,0)},OPENLAYERS);
+u("ol.size.toSize",md,OPENLAYERS);uh.prototype.getTileCoord=uh.prototype.g;Co.prototype.getFormat=Co.prototype.Ll;Co.prototype.setLoader=Co.prototype.ai;u("ol.View",Nf,OPENLAYERS);Nf.prototype.constrainCenter=Nf.prototype.Xd;Nf.prototype.constrainResolution=Nf.prototype.constrainResolution;Nf.prototype.constrainRotation=Nf.prototype.constrainRotation;Nf.prototype.getCenter=Nf.prototype.Ua;Nf.prototype.calculateExtent=Nf.prototype.$c;Nf.prototype.getProjection=Nf.prototype.Ml;
+Nf.prototype.getResolution=Nf.prototype.$;Nf.prototype.getRotation=Nf.prototype.Fa;Nf.prototype.getZoom=Nf.prototype.uk;Nf.prototype.fit=Nf.prototype.kf;Nf.prototype.centerOn=Nf.prototype.uj;Nf.prototype.rotate=Nf.prototype.rotate;Nf.prototype.setCenter=Nf.prototype.kb;Nf.prototype.setResolution=Nf.prototype.Ub;Nf.prototype.setRotation=Nf.prototype.ue;Nf.prototype.setZoom=Nf.prototype.Wo;u("ol.xml.getAllTextContent",Mo,OPENLAYERS);u("ol.xml.parse",fp,OPENLAYERS);rq.prototype.getGL=rq.prototype.Gn;
+rq.prototype.useProgram=rq.prototype.He;u("ol.tilegrid.TileGrid",zh,OPENLAYERS);zh.prototype.getMaxZoom=zh.prototype.Eg;zh.prototype.getMinZoom=zh.prototype.Fg;zh.prototype.getOrigin=zh.prototype.Da;zh.prototype.getResolution=zh.prototype.$;zh.prototype.getResolutions=zh.prototype.zh;zh.prototype.getTileCoordExtent=zh.prototype.Aa;zh.prototype.getTileCoordForCoordAndResolution=zh.prototype.fe;zh.prototype.getTileCoordForCoordAndZ=zh.prototype.ge;zh.prototype.getTileSize=zh.prototype.Ka;
+u("ol.tilegrid.createXYZ",Mh,OPENLAYERS);u("ol.tilegrid.WMTS",zA,OPENLAYERS);zA.prototype.getMatrixIds=zA.prototype.o;u("ol.tilegrid.WMTS.createFromCapabilitiesMatrixSet",AA,OPENLAYERS);u("ol.style.AtlasManager",EA,OPENLAYERS);u("ol.style.Circle",Zl,OPENLAYERS);Zl.prototype.getFill=Zl.prototype.en;Zl.prototype.getImage=Zl.prototype.gc;Zl.prototype.getRadius=Zl.prototype.fn;Zl.prototype.getStroke=Zl.prototype.gn;u("ol.style.Fill",Tl,OPENLAYERS);Tl.prototype.getColor=Tl.prototype.b;
+Tl.prototype.setColor=Tl.prototype.c;u("ol.style.Icon",tk,OPENLAYERS);tk.prototype.getAnchor=tk.prototype.Xb;tk.prototype.getImage=tk.prototype.gc;tk.prototype.getOrigin=tk.prototype.Da;tk.prototype.getSrc=tk.prototype.hn;tk.prototype.getSize=tk.prototype.Cb;tk.prototype.load=tk.prototype.load;u("ol.style.Image",sk,OPENLAYERS);sk.prototype.getOpacity=sk.prototype.Be;sk.prototype.getRotateWithView=sk.prototype.de;sk.prototype.getRotation=sk.prototype.Ce;sk.prototype.getScale=sk.prototype.De;
+sk.prototype.getSnapToPixel=sk.prototype.ee;sk.prototype.setOpacity=sk.prototype.Ee;sk.prototype.setRotation=sk.prototype.Fe;sk.prototype.setScale=sk.prototype.Ge;u("ol.style.RegularShape",IA,OPENLAYERS);IA.prototype.getAnchor=IA.prototype.Xb;IA.prototype.getAngle=IA.prototype.jn;IA.prototype.getFill=IA.prototype.kn;IA.prototype.getImage=IA.prototype.gc;IA.prototype.getOrigin=IA.prototype.Da;IA.prototype.getPoints=IA.prototype.ln;IA.prototype.getRadius=IA.prototype.mn;IA.prototype.getRadius2=IA.prototype.jk;
+IA.prototype.getSize=IA.prototype.Cb;IA.prototype.getStroke=IA.prototype.nn;u("ol.style.Stroke",Yl,OPENLAYERS);Yl.prototype.getColor=Yl.prototype.pn;Yl.prototype.getLineCap=Yl.prototype.Uj;Yl.prototype.getLineDash=Yl.prototype.qn;Yl.prototype.getLineJoin=Yl.prototype.Vj;Yl.prototype.getMiterLimit=Yl.prototype.$j;Yl.prototype.getWidth=Yl.prototype.rn;Yl.prototype.setColor=Yl.prototype.sn;Yl.prototype.setLineCap=Yl.prototype.Oo;Yl.prototype.setLineDash=Yl.prototype.tn;Yl.prototype.setLineJoin=Yl.prototype.Po;
+Yl.prototype.setMiterLimit=Yl.prototype.Qo;Yl.prototype.setWidth=Yl.prototype.Uo;u("ol.style.Style",$l,OPENLAYERS);$l.prototype.getGeometry=$l.prototype.X;$l.prototype.getGeometryFunction=$l.prototype.Pj;$l.prototype.getFill=$l.prototype.vn;$l.prototype.getImage=$l.prototype.wn;$l.prototype.getStroke=$l.prototype.xn;$l.prototype.getText=$l.prototype.Ca;$l.prototype.getZIndex=$l.prototype.yn;$l.prototype.setGeometry=$l.prototype.yh;$l.prototype.setZIndex=$l.prototype.zn;u("ol.style.Text",Wt,OPENLAYERS);
+Wt.prototype.getFont=Wt.prototype.Nj;Wt.prototype.getOffsetX=Wt.prototype.ak;Wt.prototype.getOffsetY=Wt.prototype.bk;Wt.prototype.getFill=Wt.prototype.An;Wt.prototype.getRotation=Wt.prototype.Bn;Wt.prototype.getScale=Wt.prototype.Cn;Wt.prototype.getStroke=Wt.prototype.Dn;Wt.prototype.getText=Wt.prototype.Ca;Wt.prototype.getTextAlign=Wt.prototype.nk;Wt.prototype.getTextBaseline=Wt.prototype.pk;Wt.prototype.setFont=Wt.prototype.Lo;Wt.prototype.setOffsetX=Wt.prototype.ci;Wt.prototype.setOffsetY=Wt.prototype.di;
+Wt.prototype.setFill=Wt.prototype.Ko;Wt.prototype.setRotation=Wt.prototype.En;Wt.prototype.setScale=Wt.prototype.Fn;Wt.prototype.setStroke=Wt.prototype.Ro;Wt.prototype.setText=Wt.prototype.fi;Wt.prototype.setTextAlign=Wt.prototype.gi;Wt.prototype.setTextBaseline=Wt.prototype.So;u("ol.Sphere",ze,OPENLAYERS);ze.prototype.geodesicArea=ze.prototype.f;ze.prototype.haversineDistance=ze.prototype.a;u("ol.source.BingMaps",Kz,OPENLAYERS);u("ol.source.BingMaps.TOS_ATTRIBUTION",Lz,OPENLAYERS);
+u("ol.source.Cluster",Mz,OPENLAYERS);Mz.prototype.getSource=Mz.prototype.ga;u("ol.source.ImageCanvas",on,OPENLAYERS);u("ol.source.ImageMapGuide",Pz,OPENLAYERS);Pz.prototype.getParams=Pz.prototype.Hm;Pz.prototype.getImageLoadFunction=Pz.prototype.Gm;Pz.prototype.updateParams=Pz.prototype.Jm;Pz.prototype.setImageLoadFunction=Pz.prototype.Im;u("ol.source.Image",gn,OPENLAYERS);jn.prototype.image=jn.prototype.image;u("ol.source.ImageStatic",Qz,OPENLAYERS);u("ol.source.ImageVector",Mp,OPENLAYERS);
+Mp.prototype.getSource=Mp.prototype.Km;Mp.prototype.getStyle=Mp.prototype.Lm;Mp.prototype.getStyleFunction=Mp.prototype.Mm;Mp.prototype.setStyle=Mp.prototype.ph;u("ol.source.ImageWMS",Rz,OPENLAYERS);Rz.prototype.getGetFeatureInfoUrl=Rz.prototype.Pm;Rz.prototype.getParams=Rz.prototype.Rm;Rz.prototype.getImageLoadFunction=Rz.prototype.Qm;Rz.prototype.getUrl=Rz.prototype.Sm;Rz.prototype.setImageLoadFunction=Rz.prototype.Tm;Rz.prototype.setUrl=Rz.prototype.Um;Rz.prototype.updateParams=Rz.prototype.Vm;
+u("ol.source.MapQuest",Yz,OPENLAYERS);Yz.prototype.getLayer=Yz.prototype.l;u("ol.source.OSM",Wz,OPENLAYERS);u("ol.source.OSM.ATTRIBUTION",Xz,OPENLAYERS);u("ol.source.Raster",aA,OPENLAYERS);aA.prototype.setOperation=aA.prototype.v;fA.prototype.extent=fA.prototype.extent;fA.prototype.resolution=fA.prototype.resolution;fA.prototype.data=fA.prototype.data;u("ol.source.Source",wh,OPENLAYERS);wh.prototype.getAttributions=wh.prototype.sa;wh.prototype.getLogo=wh.prototype.qa;wh.prototype.getProjection=wh.prototype.ta;
+wh.prototype.getState=wh.prototype.ua;wh.prototype.setAttributions=wh.prototype.ma;u("ol.source.Stamen",kA,OPENLAYERS);u("ol.source.TileArcGISRest",mA,OPENLAYERS);mA.prototype.getParams=mA.prototype.C;mA.prototype.updateParams=mA.prototype.V;u("ol.source.TileDebug",oA,OPENLAYERS);u("ol.source.TileImage",Y,OPENLAYERS);Y.prototype.setRenderReprojectionEdges=Y.prototype.vb;Y.prototype.setTileGridForProjection=Y.prototype.wb;u("ol.source.TileJSON",pA,OPENLAYERS);u("ol.source.Tile",Nh,OPENLAYERS);
+Nh.prototype.getTileGrid=Nh.prototype.Ha;Qh.prototype.tile=Qh.prototype.tile;u("ol.source.TileUTFGrid",qA,OPENLAYERS);qA.prototype.getTemplate=qA.prototype.mk;qA.prototype.forDataAtCoordinateAndResolution=qA.prototype.zj;u("ol.source.TileWMS",vA,OPENLAYERS);vA.prototype.getGetFeatureInfoUrl=vA.prototype.Ym;vA.prototype.getParams=vA.prototype.Zm;vA.prototype.updateParams=vA.prototype.an;Wp.prototype.getTileLoadFunction=Wp.prototype.Xa;Wp.prototype.getTileUrlFunction=Wp.prototype.Ya;
+Wp.prototype.getUrls=Wp.prototype.Za;Wp.prototype.setTileLoadFunction=Wp.prototype.eb;Wp.prototype.setTileUrlFunction=Wp.prototype.Ja;Wp.prototype.setUrl=Wp.prototype.Va;Wp.prototype.setUrls=Wp.prototype.Wa;u("ol.source.Vector",R,OPENLAYERS);R.prototype.addFeature=R.prototype.Bd;R.prototype.addFeatures=R.prototype.Ec;R.prototype.clear=R.prototype.clear;R.prototype.forEachFeature=R.prototype.sg;R.prototype.forEachFeatureInExtent=R.prototype.pb;R.prototype.forEachFeatureIntersectingExtent=R.prototype.tg;
+R.prototype.getFeaturesCollection=R.prototype.zg;R.prototype.getFeatures=R.prototype.ze;R.prototype.getFeaturesAtCoordinate=R.prototype.yg;R.prototype.getFeaturesInExtent=R.prototype.mf;R.prototype.getClosestFeatureToCoordinate=R.prototype.vg;R.prototype.getExtent=R.prototype.J;R.prototype.getFeatureById=R.prototype.xg;R.prototype.removeFeature=R.prototype.Rc;Jp.prototype.feature=Jp.prototype.feature;u("ol.source.VectorTile",Xp,OPENLAYERS);u("ol.source.WMTS",Z,OPENLAYERS);
+Z.prototype.getDimensions=Z.prototype.Lj;Z.prototype.getFormat=Z.prototype.bn;Z.prototype.getLayer=Z.prototype.cn;Z.prototype.getMatrixSet=Z.prototype.Yj;Z.prototype.getRequestEncoding=Z.prototype.kk;Z.prototype.getStyle=Z.prototype.dn;Z.prototype.getVersion=Z.prototype.rk;Z.prototype.updateDimensions=Z.prototype.cp;
+u("ol.source.WMTS.optionsFromCapabilities",function(b,c){var d=fb(b.Contents.Layer,function(b){return b.Identifier==c.layer}),e=b.Contents.TileMatrixSet,f,g;f=1<d.TileMatrixSetLink.length?"projection"in c?gb(d.TileMatrixSetLink,function(b){return fb(e,function(c){return c.Identifier==b.TileMatrixSet}).SupportedCRS.replace(/urn:ogc:def:crs:(\w+):(.*:)?(\w+)$/,"$1:$3")==c.projection}):gb(d.TileMatrixSetLink,function(b){return b.TileMatrixSet==c.matrixSet}):0;0>f&&(f=0);g=d.TileMatrixSetLink[f].TileMatrixSet;
+var h=d.Format[0];"format"in c&&(h=c.format);f=gb(d.Style,function(b){return"style"in c?b.Title==c.style:b.isDefault});0>f&&(f=0);f=d.Style[f].Identifier;var k={};"Dimension"in d&&d.Dimension.forEach(function(b){var c=b.Identifier,d=b.Default;void 0===d&&(d=b.Value[0]);k[c]=d});var m=fb(b.Contents.TileMatrixSet,function(b){return b.Identifier==g}),n;n="projection"in c?Ee(c.projection):Ee(m.SupportedCRS.replace(/urn:ogc:def:crs:(\w+):(.*:)?(\w+)$/,"$1:$3"));var p=d.WGS84BoundingBox,q,r;void 0!==p&&
+(r=Ee("EPSG:4326").J(),r=p[0]==r[0]&&p[2]==r[2],q=Ze(p,"EPSG:4326",n),(p=n.J())&&(Vd(p,q)||(q=void 0)));var m=AA(m,q),t=[];q=c.requestEncoding;q=void 0!==q?q:"";if(b.hasOwnProperty("OperationsMetadata")&&b.OperationsMetadata.hasOwnProperty("GetTile")&&0!==q.indexOf("REST"))for(var d=b.OperationsMetadata.GetTile.DCP.HTTP.Get,p=0,x=d.length;p<x;++p){var z=fb(d[p].Constraint,function(b){return"GetEncoding"==b.name}).AllowedValues.Value;0<z.length&&vb(z,"KVP")&&(q="KVP",t.push(d[p].href))}else q="REST",
+d.ResourceURL.forEach(function(b){"tile"==b.resourceType&&(h=b.format,t.push(b.template))});return{urls:t,layer:c.layer,matrixSet:g,format:h,projection:n,requestEncoding:q,tileGrid:m,style:f,dimensions:k,wrapX:r}},OPENLAYERS);u("ol.source.XYZ",Vz,OPENLAYERS);u("ol.source.Zoomify",CA,OPENLAYERS);bk.prototype.vectorContext=bk.prototype.vectorContext;bk.prototype.frameState=bk.prototype.frameState;bk.prototype.context=bk.prototype.context;bk.prototype.glContext=bk.prototype.glContext;
+Sm.prototype.get=Sm.prototype.get;Sm.prototype.getExtent=Sm.prototype.J;Sm.prototype.getGeometry=Sm.prototype.X;Sm.prototype.getProperties=Sm.prototype.Cm;Sm.prototype.getType=Sm.prototype.W;u("ol.render.VectorContext",ak,OPENLAYERS);Oq.prototype.drawAsync=Oq.prototype.md;Oq.prototype.drawCircleGeometry=Oq.prototype.Gc;Oq.prototype.drawFeature=Oq.prototype.jf;Oq.prototype.drawGeometryCollectionGeometry=Oq.prototype.Yd;Oq.prototype.drawPointGeometry=Oq.prototype.Hb;
+Oq.prototype.drawLineStringGeometry=Oq.prototype.Wb;Oq.prototype.drawMultiLineStringGeometry=Oq.prototype.Hc;Oq.prototype.drawMultiPointGeometry=Oq.prototype.Gb;Oq.prototype.drawMultiPolygonGeometry=Oq.prototype.Ic;Oq.prototype.drawPolygonGeometry=Oq.prototype.Jc;Oq.prototype.drawText=Oq.prototype.Ib;Oq.prototype.setFillStrokeStyle=Oq.prototype.bb;Oq.prototype.setImageStyle=Oq.prototype.ub;Oq.prototype.setTextStyle=Oq.prototype.cb;gm.prototype.drawAsync=gm.prototype.md;
+gm.prototype.drawCircleGeometry=gm.prototype.Gc;gm.prototype.drawFeature=gm.prototype.jf;gm.prototype.drawPointGeometry=gm.prototype.Hb;gm.prototype.drawMultiPointGeometry=gm.prototype.Gb;gm.prototype.drawLineStringGeometry=gm.prototype.Wb;gm.prototype.drawMultiLineStringGeometry=gm.prototype.Hc;gm.prototype.drawPolygonGeometry=gm.prototype.Jc;gm.prototype.drawMultiPolygonGeometry=gm.prototype.Ic;gm.prototype.setFillStrokeStyle=gm.prototype.bb;gm.prototype.setImageStyle=gm.prototype.ub;
+gm.prototype.setTextStyle=gm.prototype.cb;u("ol.proj.common.add",Ol,OPENLAYERS);u("ol.proj.METERS_PER_UNIT",Be,OPENLAYERS);u("ol.proj.Projection",Ce,OPENLAYERS);Ce.prototype.getCode=Ce.prototype.Jj;Ce.prototype.getExtent=Ce.prototype.J;Ce.prototype.getUnits=Ce.prototype.Am;Ce.prototype.getMetersPerUnit=Ce.prototype.Kc;Ce.prototype.getWorldExtent=Ce.prototype.tk;Ce.prototype.isGlobal=Ce.prototype.gl;Ce.prototype.setGlobal=Ce.prototype.No;Ce.prototype.setExtent=Ce.prototype.Bm;
+Ce.prototype.setWorldExtent=Ce.prototype.Vo;Ce.prototype.setGetPointResolution=Ce.prototype.Mo;Ce.prototype.getPointResolution=Ce.prototype.getPointResolution;u("ol.proj.addEquivalentProjections",Fe,OPENLAYERS);u("ol.proj.addProjection",Se,OPENLAYERS);u("ol.proj.addCoordinateTransforms",Ge,OPENLAYERS);u("ol.proj.fromLonLat",function(b,c){return Ye(b,"EPSG:4326",void 0!==c?c:"EPSG:3857")},OPENLAYERS);u("ol.proj.toLonLat",function(b,c){return Ye(b,void 0!==c?c:"EPSG:3857","EPSG:4326")},OPENLAYERS);
+u("ol.proj.get",Ee,OPENLAYERS);u("ol.proj.getTransform",We,OPENLAYERS);u("ol.proj.transform",Ye,OPENLAYERS);u("ol.proj.transformExtent",Ze,OPENLAYERS);u("ol.layer.Heatmap",X,OPENLAYERS);X.prototype.getBlur=X.prototype.ug;X.prototype.getGradient=X.prototype.Bg;X.prototype.getRadius=X.prototype.jh;X.prototype.setBlur=X.prototype.Vh;X.prototype.setGradient=X.prototype.Zh;X.prototype.setRadius=X.prototype.kh;u("ol.layer.Image",Pl,OPENLAYERS);Pl.prototype.getSource=Pl.prototype.ea;
+u("ol.layer.Layer",ck,OPENLAYERS);ck.prototype.getSource=ck.prototype.ea;ck.prototype.setMap=ck.prototype.setMap;ck.prototype.setSource=ck.prototype.zc;u("ol.layer.Base",Yj,OPENLAYERS);Yj.prototype.getExtent=Yj.prototype.J;Yj.prototype.getMaxResolution=Yj.prototype.Nb;Yj.prototype.getMinResolution=Yj.prototype.Ob;Yj.prototype.getOpacity=Yj.prototype.Rb;Yj.prototype.getVisible=Yj.prototype.rb;Yj.prototype.getZIndex=Yj.prototype.Sb;Yj.prototype.setExtent=Yj.prototype.cc;
+Yj.prototype.setMaxResolution=Yj.prototype.kc;Yj.prototype.setMinResolution=Yj.prototype.lc;Yj.prototype.setOpacity=Yj.prototype.dc;Yj.prototype.setVisible=Yj.prototype.ec;Yj.prototype.setZIndex=Yj.prototype.fc;u("ol.layer.Group",Hl,OPENLAYERS);Hl.prototype.getLayers=Hl.prototype.Qc;Hl.prototype.setLayers=Hl.prototype.ih;u("ol.layer.Tile",G,OPENLAYERS);G.prototype.getPreload=G.prototype.a;G.prototype.getSource=G.prototype.ea;G.prototype.setPreload=G.prototype.c;
+G.prototype.getUseInterimTilesOnError=G.prototype.b;G.prototype.setUseInterimTilesOnError=G.prototype.g;u("ol.layer.Vector",H,OPENLAYERS);H.prototype.getSource=H.prototype.ea;H.prototype.getStyle=H.prototype.C;H.prototype.getStyleFunction=H.prototype.D;H.prototype.setStyle=H.prototype.c;u("ol.layer.VectorTile",I,OPENLAYERS);I.prototype.getPreload=I.prototype.g;I.prototype.getSource=I.prototype.ea;I.prototype.getUseInterimTilesOnError=I.prototype.U;I.prototype.setPreload=I.prototype.T;
+I.prototype.setUseInterimTilesOnError=I.prototype.V;u("ol.interaction.DoubleClickZoom",Pk,OPENLAYERS);u("ol.interaction.DoubleClickZoom.handleEvent",Qk,OPENLAYERS);u("ol.interaction.DragAndDrop",qy,OPENLAYERS);u("ol.interaction.DragAndDrop.handleEvent",te,OPENLAYERS);ry.prototype.features=ry.prototype.features;ry.prototype.file=ry.prototype.file;ry.prototype.projection=ry.prototype.projection;ll.prototype.coordinate=ll.prototype.coordinate;u("ol.interaction.DragBox",ml,OPENLAYERS);
+ml.prototype.getGeometry=ml.prototype.X;u("ol.interaction.DragPan",al,OPENLAYERS);u("ol.interaction.DragRotateAndZoom",uy,OPENLAYERS);u("ol.interaction.DragRotate",el,OPENLAYERS);u("ol.interaction.DragZoom",rl,OPENLAYERS);yy.prototype.feature=yy.prototype.feature;u("ol.interaction.Draw",zy,OPENLAYERS);u("ol.interaction.Draw.handleEvent",By,OPENLAYERS);zy.prototype.removeLastPoint=zy.prototype.Ao;zy.prototype.finishDrawing=zy.prototype.od;zy.prototype.extend=zy.prototype.fm;
+u("ol.interaction.Draw.createRegularPolygon",function(b,c){return function(d,e){var f=d[0],g=d[1],h=Math.sqrt(vd(f,g)),k=e?e:Lf(new Nx(f),b);Mf(k,f,h,c?c:Math.atan((g[1]-f[1])/(g[0]-f[0])));return k}},OPENLAYERS);u("ol.interaction.Interaction",Lk,OPENLAYERS);Lk.prototype.getActive=Lk.prototype.b;Lk.prototype.getMap=Lk.prototype.i;Lk.prototype.setActive=Lk.prototype.g;u("ol.interaction.defaults",Gl,OPENLAYERS);u("ol.interaction.KeyboardPan",sl,OPENLAYERS);
+u("ol.interaction.KeyboardPan.handleEvent",tl,OPENLAYERS);u("ol.interaction.KeyboardZoom",ul,OPENLAYERS);u("ol.interaction.KeyboardZoom.handleEvent",vl,OPENLAYERS);Py.prototype.features=Py.prototype.features;Py.prototype.mapBrowserPointerEvent=Py.prototype.mapBrowserPointerEvent;u("ol.interaction.Modify",Qy,OPENLAYERS);u("ol.interaction.Modify.handleEvent",Ty,OPENLAYERS);u("ol.interaction.MouseWheelZoom",wl,OPENLAYERS);u("ol.interaction.MouseWheelZoom.handleEvent",xl,OPENLAYERS);
+wl.prototype.setMouseAnchor=wl.prototype.D;u("ol.interaction.PinchRotate",yl,OPENLAYERS);u("ol.interaction.PinchZoom",Cl,OPENLAYERS);u("ol.interaction.Pointer",Yk,OPENLAYERS);u("ol.interaction.Pointer.handleEvent",Zk,OPENLAYERS);cz.prototype.selected=cz.prototype.selected;cz.prototype.deselected=cz.prototype.deselected;cz.prototype.mapBrowserEvent=cz.prototype.mapBrowserEvent;u("ol.interaction.Select",dz,OPENLAYERS);dz.prototype.getFeatures=dz.prototype.pm;dz.prototype.getLayer=dz.prototype.qm;
+u("ol.interaction.Select.handleEvent",ez,OPENLAYERS);dz.prototype.setMap=dz.prototype.setMap;u("ol.interaction.Snap",gz,OPENLAYERS);gz.prototype.addFeature=gz.prototype.xd;gz.prototype.removeFeature=gz.prototype.yd;kz.prototype.features=kz.prototype.features;kz.prototype.coordinate=kz.prototype.coordinate;u("ol.interaction.Translate",lz,OPENLAYERS);u("ol.geom.Circle",Nx,OPENLAYERS);Nx.prototype.clone=Nx.prototype.clone;Nx.prototype.getCenter=Nx.prototype.wd;Nx.prototype.getRadius=Nx.prototype.zf;
+Nx.prototype.getType=Nx.prototype.W;Nx.prototype.intersectsExtent=Nx.prototype.Ea;Nx.prototype.setCenter=Nx.prototype.Yl;Nx.prototype.setCenterAndRadius=Nx.prototype.Uf;Nx.prototype.setRadius=Nx.prototype.Zl;Nx.prototype.transform=Nx.prototype.lb;u("ol.geom.Geometry",$e,OPENLAYERS);$e.prototype.getClosestPoint=$e.prototype.qb;$e.prototype.getExtent=$e.prototype.J;$e.prototype.simplify=$e.prototype.xb;$e.prototype.transform=$e.prototype.lb;u("ol.geom.GeometryCollection",gs,OPENLAYERS);
+gs.prototype.clone=gs.prototype.clone;gs.prototype.getGeometries=gs.prototype.Ag;gs.prototype.getType=gs.prototype.W;gs.prototype.intersectsExtent=gs.prototype.Ea;gs.prototype.setGeometries=gs.prototype.Yh;gs.prototype.applyTransform=gs.prototype.pc;gs.prototype.translate=gs.prototype.Pc;u("ol.geom.LinearRing",vf,OPENLAYERS);vf.prototype.clone=vf.prototype.clone;vf.prototype.getArea=vf.prototype.bm;vf.prototype.getCoordinates=vf.prototype.Z;vf.prototype.getType=vf.prototype.W;
+vf.prototype.setCoordinates=vf.prototype.la;u("ol.geom.LineString",T,OPENLAYERS);T.prototype.appendCoordinate=T.prototype.mj;T.prototype.clone=T.prototype.clone;T.prototype.forEachSegment=T.prototype.Cj;T.prototype.getCoordinateAtM=T.prototype.$l;T.prototype.getCoordinates=T.prototype.Z;T.prototype.getLength=T.prototype.am;T.prototype.getType=T.prototype.W;T.prototype.intersectsExtent=T.prototype.Ea;T.prototype.setCoordinates=T.prototype.la;u("ol.geom.MultiLineString",U,OPENLAYERS);
+U.prototype.appendLineString=U.prototype.nj;U.prototype.clone=U.prototype.clone;U.prototype.getCoordinateAtM=U.prototype.cm;U.prototype.getCoordinates=U.prototype.Z;U.prototype.getLineString=U.prototype.Wj;U.prototype.getLineStrings=U.prototype.sd;U.prototype.getType=U.prototype.W;U.prototype.intersectsExtent=U.prototype.Ea;U.prototype.setCoordinates=U.prototype.la;u("ol.geom.MultiPoint",Xr,OPENLAYERS);Xr.prototype.appendPoint=Xr.prototype.pj;Xr.prototype.clone=Xr.prototype.clone;
+Xr.prototype.getCoordinates=Xr.prototype.Z;Xr.prototype.getPoint=Xr.prototype.gk;Xr.prototype.getPoints=Xr.prototype.ve;Xr.prototype.getType=Xr.prototype.W;Xr.prototype.intersectsExtent=Xr.prototype.Ea;Xr.prototype.setCoordinates=Xr.prototype.la;u("ol.geom.MultiPolygon",V,OPENLAYERS);V.prototype.appendPolygon=V.prototype.qj;V.prototype.clone=V.prototype.clone;V.prototype.getArea=V.prototype.dm;V.prototype.getCoordinates=V.prototype.Z;V.prototype.getInteriorPoints=V.prototype.Tj;
+V.prototype.getPolygon=V.prototype.ik;V.prototype.getPolygons=V.prototype.ce;V.prototype.getType=V.prototype.W;V.prototype.intersectsExtent=V.prototype.Ea;V.prototype.setCoordinates=V.prototype.la;u("ol.geom.Point",E,OPENLAYERS);E.prototype.clone=E.prototype.clone;E.prototype.getCoordinates=E.prototype.Z;E.prototype.getType=E.prototype.W;E.prototype.intersectsExtent=E.prototype.Ea;E.prototype.setCoordinates=E.prototype.la;u("ol.geom.Polygon",F,OPENLAYERS);F.prototype.appendLinearRing=F.prototype.oj;
+F.prototype.clone=F.prototype.clone;F.prototype.getArea=F.prototype.em;F.prototype.getCoordinates=F.prototype.Z;F.prototype.getInteriorPoint=F.prototype.Sj;F.prototype.getLinearRingCount=F.prototype.Xj;F.prototype.getLinearRing=F.prototype.Dg;F.prototype.getLinearRings=F.prototype.be;F.prototype.getType=F.prototype.W;F.prototype.intersectsExtent=F.prototype.Ea;F.prototype.setCoordinates=F.prototype.la;u("ol.geom.Polygon.circular",Jf,OPENLAYERS);u("ol.geom.Polygon.fromExtent",Kf,OPENLAYERS);
+u("ol.geom.Polygon.fromCircle",Lf,OPENLAYERS);u("ol.geom.SimpleGeometry",bf,OPENLAYERS);bf.prototype.getFirstCoordinate=bf.prototype.Kb;bf.prototype.getLastCoordinate=bf.prototype.Lb;bf.prototype.getLayout=bf.prototype.Mb;bf.prototype.applyTransform=bf.prototype.pc;bf.prototype.translate=bf.prototype.Pc;u("ol.format.EsriJSON",$r,OPENLAYERS);$r.prototype.readFeature=$r.prototype.Tb;$r.prototype.readFeatures=$r.prototype.Ba;$r.prototype.readGeometry=$r.prototype.Tc;$r.prototype.readProjection=$r.prototype.Ia;
+$r.prototype.writeGeometry=$r.prototype.Xc;$r.prototype.writeGeometryObject=$r.prototype.Ue;$r.prototype.writeFeature=$r.prototype.Kd;$r.prototype.writeFeatureObject=$r.prototype.Wc;$r.prototype.writeFeatures=$r.prototype.Vb;$r.prototype.writeFeaturesObject=$r.prototype.Se;u("ol.format.Feature",Nr,OPENLAYERS);u("ol.format.GeoJSON",ks,OPENLAYERS);ks.prototype.readFeature=ks.prototype.Tb;ks.prototype.readFeatures=ks.prototype.Ba;ks.prototype.readGeometry=ks.prototype.Tc;
+ks.prototype.readProjection=ks.prototype.Ia;ks.prototype.writeFeature=ks.prototype.Kd;ks.prototype.writeFeatureObject=ks.prototype.Wc;ks.prototype.writeFeatures=ks.prototype.Vb;ks.prototype.writeFeaturesObject=ks.prototype.Se;ks.prototype.writeGeometry=ks.prototype.Xc;ks.prototype.writeGeometryObject=ks.prototype.Ue;u("ol.format.GPX",Os,OPENLAYERS);Os.prototype.readFeature=Os.prototype.Tb;Os.prototype.readFeatures=Os.prototype.Ba;Os.prototype.readProjection=Os.prototype.Ia;
+Os.prototype.writeFeatures=Os.prototype.Vb;Os.prototype.writeFeaturesNode=Os.prototype.f;u("ol.format.IGC",yt,OPENLAYERS);yt.prototype.readFeature=yt.prototype.Tb;yt.prototype.readFeatures=yt.prototype.Ba;yt.prototype.readProjection=yt.prototype.Ia;u("ol.format.KML",Xt,OPENLAYERS);Xt.prototype.readFeature=Xt.prototype.Tb;Xt.prototype.readFeatures=Xt.prototype.Ba;Xt.prototype.readName=Xt.prototype.po;Xt.prototype.readNetworkLinks=Xt.prototype.qo;Xt.prototype.readProjection=Xt.prototype.Ia;
+Xt.prototype.writeFeatures=Xt.prototype.Vb;Xt.prototype.writeFeaturesNode=Xt.prototype.f;u("ol.format.MVT",Lv,OPENLAYERS);Lv.prototype.setLayers=Lv.prototype.g;u("ol.format.OSMXML",Nv,OPENLAYERS);Nv.prototype.readFeatures=Nv.prototype.Ba;Nv.prototype.readProjection=Nv.prototype.Ia;u("ol.format.Polyline",lw,OPENLAYERS);u("ol.format.Polyline.encodeDeltas",mw,OPENLAYERS);u("ol.format.Polyline.decodeDeltas",ow,OPENLAYERS);u("ol.format.Polyline.encodeFloats",nw,OPENLAYERS);
+u("ol.format.Polyline.decodeFloats",pw,OPENLAYERS);lw.prototype.readFeature=lw.prototype.Tb;lw.prototype.readFeatures=lw.prototype.Ba;lw.prototype.readGeometry=lw.prototype.Tc;lw.prototype.readProjection=lw.prototype.Ia;lw.prototype.writeGeometry=lw.prototype.Xc;u("ol.format.TopoJSON",qw,OPENLAYERS);qw.prototype.readFeatures=qw.prototype.Ba;qw.prototype.readProjection=qw.prototype.Ia;u("ol.format.WFS",ww,OPENLAYERS);ww.prototype.readFeatures=ww.prototype.Ba;ww.prototype.readTransactionResponse=ww.prototype.j;
+ww.prototype.readFeatureCollectionMetadata=ww.prototype.i;ww.prototype.writeGetFeature=ww.prototype.l;ww.prototype.writeTransaction=ww.prototype.B;ww.prototype.readProjection=ww.prototype.Ia;u("ol.format.WKT",Jw,OPENLAYERS);Jw.prototype.readFeature=Jw.prototype.Tb;Jw.prototype.readFeatures=Jw.prototype.Ba;Jw.prototype.readGeometry=Jw.prototype.Tc;Jw.prototype.writeFeature=Jw.prototype.Kd;Jw.prototype.writeFeatures=Jw.prototype.Vb;Jw.prototype.writeGeometry=Jw.prototype.Xc;
+u("ol.format.WMSCapabilities",ax,OPENLAYERS);ax.prototype.read=ax.prototype.read;u("ol.format.WMSGetFeatureInfo",xx,OPENLAYERS);xx.prototype.readFeatures=xx.prototype.Ba;u("ol.format.WMTSCapabilities",yx,OPENLAYERS);yx.prototype.read=yx.prototype.read;u("ol.format.GML2",Es,OPENLAYERS);u("ol.format.GML3",Fs,OPENLAYERS);Fs.prototype.writeGeometryNode=Fs.prototype.o;Fs.prototype.writeFeatures=Fs.prototype.Vb;Fs.prototype.writeFeaturesNode=Fs.prototype.f;u("ol.format.GML",Fs,OPENLAYERS);
+Fs.prototype.writeFeatures=Fs.prototype.Vb;Fs.prototype.writeFeaturesNode=Fs.prototype.f;ss.prototype.readFeatures=ss.prototype.Ba;u("ol.events.condition.altKeyOnly",function(b){b=b.a;return b.f&&!b.l&&!b.c},OPENLAYERS);u("ol.events.condition.altShiftKeysOnly",Rk,OPENLAYERS);u("ol.events.condition.always",te,OPENLAYERS);u("ol.events.condition.click",function(b){return b.type==Oj},OPENLAYERS);u("ol.events.condition.never",se,OPENLAYERS);u("ol.events.condition.pointerMove",Sk,OPENLAYERS);
+u("ol.events.condition.singleClick",Tk,OPENLAYERS);u("ol.events.condition.doubleClick",function(b){return b.type==Pj},OPENLAYERS);u("ol.events.condition.noModifierKeys",Uk,OPENLAYERS);u("ol.events.condition.platformModifierKeyOnly",function(b){b=b.a;return!b.f&&b.l&&!b.c},OPENLAYERS);u("ol.events.condition.shiftKeyOnly",Vk,OPENLAYERS);u("ol.events.condition.targetNotEditable",Wk,OPENLAYERS);u("ol.events.condition.mouseOnly",Xk,OPENLAYERS);u("ol.control.Attribution",Rh,OPENLAYERS);
+u("ol.control.Attribution.render",Sh,OPENLAYERS);Rh.prototype.getCollapsible=Rh.prototype.Ol;Rh.prototype.setCollapsible=Rh.prototype.Rl;Rh.prototype.setCollapsed=Rh.prototype.Ql;Rh.prototype.getCollapsed=Rh.prototype.Nl;u("ol.control.Control",oh,OPENLAYERS);oh.prototype.getMap=oh.prototype.g;oh.prototype.setMap=oh.prototype.setMap;oh.prototype.setTarget=oh.prototype.c;u("ol.control.defaults",Xh,OPENLAYERS);u("ol.control.FullScreen",bi,OPENLAYERS);u("ol.control.MousePosition",di,OPENLAYERS);
+u("ol.control.MousePosition.render",ei,OPENLAYERS);di.prototype.getCoordinateFormat=di.prototype.wg;di.prototype.getProjection=di.prototype.ah;di.prototype.setCoordinateFormat=di.prototype.Wh;di.prototype.setProjection=di.prototype.bh;u("ol.control.OverviewMap",nr,OPENLAYERS);u("ol.control.OverviewMap.render",or,OPENLAYERS);nr.prototype.getCollapsible=nr.prototype.Ul;nr.prototype.setCollapsible=nr.prototype.Xl;nr.prototype.setCollapsed=nr.prototype.Wl;nr.prototype.getCollapsed=nr.prototype.Tl;
+nr.prototype.getOverviewMap=nr.prototype.ek;u("ol.control.Rotate",Uh,OPENLAYERS);u("ol.control.Rotate.render",Vh,OPENLAYERS);u("ol.control.ScaleLine",sr,OPENLAYERS);sr.prototype.getUnits=sr.prototype.D;u("ol.control.ScaleLine.render",tr,OPENLAYERS);sr.prototype.setUnits=sr.prototype.T;u("ol.control.Zoom",Wh,OPENLAYERS);u("ol.control.ZoomSlider",Gr,OPENLAYERS);u("ol.control.ZoomSlider.render",Ir,OPENLAYERS);u("ol.control.ZoomToExtent",Lr,OPENLAYERS);u("ol.color.asArray",tg,OPENLAYERS);
+u("ol.color.asString",vg,OPENLAYERS);gd.prototype.changed=gd.prototype.u;gd.prototype.dispatchEvent=gd.prototype.s;gd.prototype.getRevision=gd.prototype.L;gd.prototype.on=gd.prototype.H;gd.prototype.once=gd.prototype.M;gd.prototype.un=gd.prototype.K;gd.prototype.unByKey=gd.prototype.N;og.prototype.get=og.prototype.get;og.prototype.getKeys=og.prototype.P;og.prototype.getProperties=og.prototype.R;og.prototype.set=og.prototype.set;og.prototype.setProperties=og.prototype.I;og.prototype.unset=og.prototype.S;
+og.prototype.changed=og.prototype.u;og.prototype.dispatchEvent=og.prototype.s;og.prototype.getRevision=og.prototype.L;og.prototype.on=og.prototype.H;og.prototype.once=og.prototype.M;og.prototype.un=og.prototype.K;og.prototype.unByKey=og.prototype.N;Mr.prototype.get=Mr.prototype.get;Mr.prototype.getKeys=Mr.prototype.P;Mr.prototype.getProperties=Mr.prototype.R;Mr.prototype.set=Mr.prototype.set;Mr.prototype.setProperties=Mr.prototype.I;Mr.prototype.unset=Mr.prototype.S;Mr.prototype.changed=Mr.prototype.u;
+Mr.prototype.dispatchEvent=Mr.prototype.s;Mr.prototype.getRevision=Mr.prototype.L;Mr.prototype.on=Mr.prototype.H;Mr.prototype.once=Mr.prototype.M;Mr.prototype.un=Mr.prototype.K;Mr.prototype.unByKey=Mr.prototype.N;pn.prototype.get=pn.prototype.get;pn.prototype.getKeys=pn.prototype.P;pn.prototype.getProperties=pn.prototype.R;pn.prototype.set=pn.prototype.set;pn.prototype.setProperties=pn.prototype.I;pn.prototype.unset=pn.prototype.S;pn.prototype.changed=pn.prototype.u;pn.prototype.dispatchEvent=pn.prototype.s;
+pn.prototype.getRevision=pn.prototype.L;pn.prototype.on=pn.prototype.H;pn.prototype.once=pn.prototype.M;pn.prototype.un=pn.prototype.K;pn.prototype.unByKey=pn.prototype.N;Mx.prototype.get=Mx.prototype.get;Mx.prototype.getKeys=Mx.prototype.P;Mx.prototype.getProperties=Mx.prototype.R;Mx.prototype.set=Mx.prototype.set;Mx.prototype.setProperties=Mx.prototype.I;Mx.prototype.unset=Mx.prototype.S;Mx.prototype.changed=Mx.prototype.u;Mx.prototype.dispatchEvent=Mx.prototype.s;Mx.prototype.getRevision=Mx.prototype.L;
+Mx.prototype.on=Mx.prototype.H;Mx.prototype.once=Mx.prototype.M;Mx.prototype.un=Mx.prototype.K;Mx.prototype.unByKey=Mx.prototype.N;Yx.prototype.getTileCoord=Yx.prototype.g;S.prototype.get=S.prototype.get;S.prototype.getKeys=S.prototype.P;S.prototype.getProperties=S.prototype.R;S.prototype.set=S.prototype.set;S.prototype.setProperties=S.prototype.I;S.prototype.unset=S.prototype.S;S.prototype.changed=S.prototype.u;S.prototype.dispatchEvent=S.prototype.s;S.prototype.getRevision=S.prototype.L;
+S.prototype.on=S.prototype.H;S.prototype.once=S.prototype.M;S.prototype.un=S.prototype.K;S.prototype.unByKey=S.prototype.N;Kj.prototype.map=Kj.prototype.map;Kj.prototype.frameState=Kj.prototype.frameState;Lj.prototype.originalEvent=Lj.prototype.originalEvent;Lj.prototype.pixel=Lj.prototype.pixel;Lj.prototype.coordinate=Lj.prototype.coordinate;Lj.prototype.dragging=Lj.prototype.dragging;Lj.prototype.preventDefault=Lj.prototype.preventDefault;Lj.prototype.stopPropagation=Lj.prototype.b;
+Lj.prototype.map=Lj.prototype.map;Lj.prototype.frameState=Lj.prototype.frameState;jr.prototype.get=jr.prototype.get;jr.prototype.getKeys=jr.prototype.P;jr.prototype.getProperties=jr.prototype.R;jr.prototype.set=jr.prototype.set;jr.prototype.setProperties=jr.prototype.I;jr.prototype.unset=jr.prototype.S;jr.prototype.changed=jr.prototype.u;jr.prototype.dispatchEvent=jr.prototype.s;jr.prototype.getRevision=jr.prototype.L;jr.prototype.on=jr.prototype.H;jr.prototype.once=jr.prototype.M;
+jr.prototype.un=jr.prototype.K;jr.prototype.unByKey=jr.prototype.N;Co.prototype.getTileCoord=Co.prototype.g;Nf.prototype.get=Nf.prototype.get;Nf.prototype.getKeys=Nf.prototype.P;Nf.prototype.getProperties=Nf.prototype.R;Nf.prototype.set=Nf.prototype.set;Nf.prototype.setProperties=Nf.prototype.I;Nf.prototype.unset=Nf.prototype.S;Nf.prototype.changed=Nf.prototype.u;Nf.prototype.dispatchEvent=Nf.prototype.s;Nf.prototype.getRevision=Nf.prototype.L;Nf.prototype.on=Nf.prototype.H;Nf.prototype.once=Nf.prototype.M;
+Nf.prototype.un=Nf.prototype.K;Nf.prototype.unByKey=Nf.prototype.N;zA.prototype.getMaxZoom=zA.prototype.Eg;zA.prototype.getMinZoom=zA.prototype.Fg;zA.prototype.getOrigin=zA.prototype.Da;zA.prototype.getResolution=zA.prototype.$;zA.prototype.getResolutions=zA.prototype.zh;zA.prototype.getTileCoordExtent=zA.prototype.Aa;zA.prototype.getTileCoordForCoordAndResolution=zA.prototype.fe;zA.prototype.getTileCoordForCoordAndZ=zA.prototype.ge;zA.prototype.getTileSize=zA.prototype.Ka;
+Zl.prototype.getOpacity=Zl.prototype.Be;Zl.prototype.getRotateWithView=Zl.prototype.de;Zl.prototype.getRotation=Zl.prototype.Ce;Zl.prototype.getScale=Zl.prototype.De;Zl.prototype.getSnapToPixel=Zl.prototype.ee;Zl.prototype.setOpacity=Zl.prototype.Ee;Zl.prototype.setRotation=Zl.prototype.Fe;Zl.prototype.setScale=Zl.prototype.Ge;tk.prototype.getOpacity=tk.prototype.Be;tk.prototype.getRotateWithView=tk.prototype.de;tk.prototype.getRotation=tk.prototype.Ce;tk.prototype.getScale=tk.prototype.De;
+tk.prototype.getSnapToPixel=tk.prototype.ee;tk.prototype.setOpacity=tk.prototype.Ee;tk.prototype.setRotation=tk.prototype.Fe;tk.prototype.setScale=tk.prototype.Ge;IA.prototype.getOpacity=IA.prototype.Be;IA.prototype.getRotateWithView=IA.prototype.de;IA.prototype.getRotation=IA.prototype.Ce;IA.prototype.getScale=IA.prototype.De;IA.prototype.getSnapToPixel=IA.prototype.ee;IA.prototype.setOpacity=IA.prototype.Ee;IA.prototype.setRotation=IA.prototype.Fe;IA.prototype.setScale=IA.prototype.Ge;
+wh.prototype.get=wh.prototype.get;wh.prototype.getKeys=wh.prototype.P;wh.prototype.getProperties=wh.prototype.R;wh.prototype.set=wh.prototype.set;wh.prototype.setProperties=wh.prototype.I;wh.prototype.unset=wh.prototype.S;wh.prototype.changed=wh.prototype.u;wh.prototype.dispatchEvent=wh.prototype.s;wh.prototype.getRevision=wh.prototype.L;wh.prototype.on=wh.prototype.H;wh.prototype.once=wh.prototype.M;wh.prototype.un=wh.prototype.K;wh.prototype.unByKey=wh.prototype.N;Nh.prototype.getAttributions=Nh.prototype.sa;
+Nh.prototype.getLogo=Nh.prototype.qa;Nh.prototype.getProjection=Nh.prototype.ta;Nh.prototype.getState=Nh.prototype.ua;Nh.prototype.setAttributions=Nh.prototype.ma;Nh.prototype.get=Nh.prototype.get;Nh.prototype.getKeys=Nh.prototype.P;Nh.prototype.getProperties=Nh.prototype.R;Nh.prototype.set=Nh.prototype.set;Nh.prototype.setProperties=Nh.prototype.I;Nh.prototype.unset=Nh.prototype.S;Nh.prototype.changed=Nh.prototype.u;Nh.prototype.dispatchEvent=Nh.prototype.s;Nh.prototype.getRevision=Nh.prototype.L;
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+Xp.prototype.getRevision=Xp.prototype.L;Xp.prototype.on=Xp.prototype.H;Xp.prototype.once=Xp.prototype.M;Xp.prototype.un=Xp.prototype.K;Xp.prototype.unByKey=Xp.prototype.N;Z.prototype.setRenderReprojectionEdges=Z.prototype.vb;Z.prototype.setTileGridForProjection=Z.prototype.wb;Z.prototype.getTileLoadFunction=Z.prototype.Xa;Z.prototype.getTileUrlFunction=Z.prototype.Ya;Z.prototype.getUrls=Z.prototype.Za;Z.prototype.setTileLoadFunction=Z.prototype.eb;Z.prototype.setTileUrlFunction=Z.prototype.Ja;
+Z.prototype.setUrl=Z.prototype.Va;Z.prototype.setUrls=Z.prototype.Wa;Z.prototype.getTileGrid=Z.prototype.Ha;Z.prototype.getAttributions=Z.prototype.sa;Z.prototype.getLogo=Z.prototype.qa;Z.prototype.getProjection=Z.prototype.ta;Z.prototype.getState=Z.prototype.ua;Z.prototype.setAttributions=Z.prototype.ma;Z.prototype.get=Z.prototype.get;Z.prototype.getKeys=Z.prototype.P;Z.prototype.getProperties=Z.prototype.R;Z.prototype.set=Z.prototype.set;Z.prototype.setProperties=Z.prototype.I;
+Z.prototype.unset=Z.prototype.S;Z.prototype.changed=Z.prototype.u;Z.prototype.dispatchEvent=Z.prototype.s;Z.prototype.getRevision=Z.prototype.L;Z.prototype.on=Z.prototype.H;Z.prototype.once=Z.prototype.M;Z.prototype.un=Z.prototype.K;Z.prototype.unByKey=Z.prototype.N;CA.prototype.setRenderReprojectionEdges=CA.prototype.vb;CA.prototype.setTileGridForProjection=CA.prototype.wb;CA.prototype.getTileLoadFunction=CA.prototype.Xa;CA.prototype.getTileUrlFunction=CA.prototype.Ya;CA.prototype.getUrls=CA.prototype.Za;
+CA.prototype.setTileLoadFunction=CA.prototype.eb;CA.prototype.setTileUrlFunction=CA.prototype.Ja;CA.prototype.setUrl=CA.prototype.Va;CA.prototype.setUrls=CA.prototype.Wa;CA.prototype.getTileGrid=CA.prototype.Ha;CA.prototype.getAttributions=CA.prototype.sa;CA.prototype.getLogo=CA.prototype.qa;CA.prototype.getProjection=CA.prototype.ta;CA.prototype.getState=CA.prototype.ua;CA.prototype.setAttributions=CA.prototype.ma;CA.prototype.get=CA.prototype.get;CA.prototype.getKeys=CA.prototype.P;
+CA.prototype.getProperties=CA.prototype.R;CA.prototype.set=CA.prototype.set;CA.prototype.setProperties=CA.prototype.I;CA.prototype.unset=CA.prototype.S;CA.prototype.changed=CA.prototype.u;CA.prototype.dispatchEvent=CA.prototype.s;CA.prototype.getRevision=CA.prototype.L;CA.prototype.on=CA.prototype.H;CA.prototype.once=CA.prototype.M;CA.prototype.un=CA.prototype.K;CA.prototype.unByKey=CA.prototype.N;sz.prototype.getTileCoord=sz.prototype.g;jk.prototype.changed=jk.prototype.u;
+jk.prototype.dispatchEvent=jk.prototype.s;jk.prototype.getRevision=jk.prototype.L;jk.prototype.on=jk.prototype.H;jk.prototype.once=jk.prototype.M;jk.prototype.un=jk.prototype.K;jk.prototype.unByKey=jk.prototype.N;Tq.prototype.changed=Tq.prototype.u;Tq.prototype.dispatchEvent=Tq.prototype.s;Tq.prototype.getRevision=Tq.prototype.L;Tq.prototype.on=Tq.prototype.H;Tq.prototype.once=Tq.prototype.M;Tq.prototype.un=Tq.prototype.K;Tq.prototype.unByKey=Tq.prototype.N;Wq.prototype.changed=Wq.prototype.u;
+Wq.prototype.dispatchEvent=Wq.prototype.s;Wq.prototype.getRevision=Wq.prototype.L;Wq.prototype.on=Wq.prototype.H;Wq.prototype.once=Wq.prototype.M;Wq.prototype.un=Wq.prototype.K;Wq.prototype.unByKey=Wq.prototype.N;br.prototype.changed=br.prototype.u;br.prototype.dispatchEvent=br.prototype.s;br.prototype.getRevision=br.prototype.L;br.prototype.on=br.prototype.H;br.prototype.once=br.prototype.M;br.prototype.un=br.prototype.K;br.prototype.unByKey=br.prototype.N;dr.prototype.changed=dr.prototype.u;
+dr.prototype.dispatchEvent=dr.prototype.s;dr.prototype.getRevision=dr.prototype.L;dr.prototype.on=dr.prototype.H;dr.prototype.once=dr.prototype.M;dr.prototype.un=dr.prototype.K;dr.prototype.unByKey=dr.prototype.N;cq.prototype.changed=cq.prototype.u;cq.prototype.dispatchEvent=cq.prototype.s;cq.prototype.getRevision=cq.prototype.L;cq.prototype.on=cq.prototype.H;cq.prototype.once=cq.prototype.M;cq.prototype.un=cq.prototype.K;cq.prototype.unByKey=cq.prototype.N;dq.prototype.changed=dq.prototype.u;
+dq.prototype.dispatchEvent=dq.prototype.s;dq.prototype.getRevision=dq.prototype.L;dq.prototype.on=dq.prototype.H;dq.prototype.once=dq.prototype.M;dq.prototype.un=dq.prototype.K;dq.prototype.unByKey=dq.prototype.N;eq.prototype.changed=eq.prototype.u;eq.prototype.dispatchEvent=eq.prototype.s;eq.prototype.getRevision=eq.prototype.L;eq.prototype.on=eq.prototype.H;eq.prototype.once=eq.prototype.M;eq.prototype.un=eq.prototype.K;eq.prototype.unByKey=eq.prototype.N;gq.prototype.changed=gq.prototype.u;
+gq.prototype.dispatchEvent=gq.prototype.s;gq.prototype.getRevision=gq.prototype.L;gq.prototype.on=gq.prototype.H;gq.prototype.once=gq.prototype.M;gq.prototype.un=gq.prototype.K;gq.prototype.unByKey=gq.prototype.N;um.prototype.changed=um.prototype.u;um.prototype.dispatchEvent=um.prototype.s;um.prototype.getRevision=um.prototype.L;um.prototype.on=um.prototype.H;um.prototype.once=um.prototype.M;um.prototype.un=um.prototype.K;um.prototype.unByKey=um.prototype.N;Op.prototype.changed=Op.prototype.u;
+Op.prototype.dispatchEvent=Op.prototype.s;Op.prototype.getRevision=Op.prototype.L;Op.prototype.on=Op.prototype.H;Op.prototype.once=Op.prototype.M;Op.prototype.un=Op.prototype.K;Op.prototype.unByKey=Op.prototype.N;Pp.prototype.changed=Pp.prototype.u;Pp.prototype.dispatchEvent=Pp.prototype.s;Pp.prototype.getRevision=Pp.prototype.L;Pp.prototype.on=Pp.prototype.H;Pp.prototype.once=Pp.prototype.M;Pp.prototype.un=Pp.prototype.K;Pp.prototype.unByKey=Pp.prototype.N;Qp.prototype.changed=Qp.prototype.u;
+Qp.prototype.dispatchEvent=Qp.prototype.s;Qp.prototype.getRevision=Qp.prototype.L;Qp.prototype.on=Qp.prototype.H;Qp.prototype.once=Qp.prototype.M;Qp.prototype.un=Qp.prototype.K;Qp.prototype.unByKey=Qp.prototype.N;Zp.prototype.changed=Zp.prototype.u;Zp.prototype.dispatchEvent=Zp.prototype.s;Zp.prototype.getRevision=Zp.prototype.L;Zp.prototype.on=Zp.prototype.H;Zp.prototype.once=Zp.prototype.M;Zp.prototype.un=Zp.prototype.K;Zp.prototype.unByKey=Zp.prototype.N;Yj.prototype.get=Yj.prototype.get;
+Yj.prototype.getKeys=Yj.prototype.P;Yj.prototype.getProperties=Yj.prototype.R;Yj.prototype.set=Yj.prototype.set;Yj.prototype.setProperties=Yj.prototype.I;Yj.prototype.unset=Yj.prototype.S;Yj.prototype.changed=Yj.prototype.u;Yj.prototype.dispatchEvent=Yj.prototype.s;Yj.prototype.getRevision=Yj.prototype.L;Yj.prototype.on=Yj.prototype.H;Yj.prototype.once=Yj.prototype.M;Yj.prototype.un=Yj.prototype.K;Yj.prototype.unByKey=Yj.prototype.N;ck.prototype.getExtent=ck.prototype.J;
+ck.prototype.getMaxResolution=ck.prototype.Nb;ck.prototype.getMinResolution=ck.prototype.Ob;ck.prototype.getOpacity=ck.prototype.Rb;ck.prototype.getVisible=ck.prototype.rb;ck.prototype.getZIndex=ck.prototype.Sb;ck.prototype.setExtent=ck.prototype.cc;ck.prototype.setMaxResolution=ck.prototype.kc;ck.prototype.setMinResolution=ck.prototype.lc;ck.prototype.setOpacity=ck.prototype.dc;ck.prototype.setVisible=ck.prototype.ec;ck.prototype.setZIndex=ck.prototype.fc;ck.prototype.get=ck.prototype.get;
+ck.prototype.getKeys=ck.prototype.P;ck.prototype.getProperties=ck.prototype.R;ck.prototype.set=ck.prototype.set;ck.prototype.setProperties=ck.prototype.I;ck.prototype.unset=ck.prototype.S;ck.prototype.changed=ck.prototype.u;ck.prototype.dispatchEvent=ck.prototype.s;ck.prototype.getRevision=ck.prototype.L;ck.prototype.on=ck.prototype.H;ck.prototype.once=ck.prototype.M;ck.prototype.un=ck.prototype.K;ck.prototype.unByKey=ck.prototype.N;H.prototype.setMap=H.prototype.setMap;H.prototype.setSource=H.prototype.zc;
+H.prototype.getExtent=H.prototype.J;H.prototype.getMaxResolution=H.prototype.Nb;H.prototype.getMinResolution=H.prototype.Ob;H.prototype.getOpacity=H.prototype.Rb;H.prototype.getVisible=H.prototype.rb;H.prototype.getZIndex=H.prototype.Sb;H.prototype.setExtent=H.prototype.cc;H.prototype.setMaxResolution=H.prototype.kc;H.prototype.setMinResolution=H.prototype.lc;H.prototype.setOpacity=H.prototype.dc;H.prototype.setVisible=H.prototype.ec;H.prototype.setZIndex=H.prototype.fc;H.prototype.get=H.prototype.get;
+H.prototype.getKeys=H.prototype.P;H.prototype.getProperties=H.prototype.R;H.prototype.set=H.prototype.set;H.prototype.setProperties=H.prototype.I;H.prototype.unset=H.prototype.S;H.prototype.changed=H.prototype.u;H.prototype.dispatchEvent=H.prototype.s;H.prototype.getRevision=H.prototype.L;H.prototype.on=H.prototype.H;H.prototype.once=H.prototype.M;H.prototype.un=H.prototype.K;H.prototype.unByKey=H.prototype.N;X.prototype.getSource=X.prototype.ea;X.prototype.getStyle=X.prototype.C;
+X.prototype.getStyleFunction=X.prototype.D;X.prototype.setStyle=X.prototype.c;X.prototype.setMap=X.prototype.setMap;X.prototype.setSource=X.prototype.zc;X.prototype.getExtent=X.prototype.J;X.prototype.getMaxResolution=X.prototype.Nb;X.prototype.getMinResolution=X.prototype.Ob;X.prototype.getOpacity=X.prototype.Rb;X.prototype.getVisible=X.prototype.rb;X.prototype.getZIndex=X.prototype.Sb;X.prototype.setExtent=X.prototype.cc;X.prototype.setMaxResolution=X.prototype.kc;X.prototype.setMinResolution=X.prototype.lc;
+X.prototype.setOpacity=X.prototype.dc;X.prototype.setVisible=X.prototype.ec;X.prototype.setZIndex=X.prototype.fc;X.prototype.get=X.prototype.get;X.prototype.getKeys=X.prototype.P;X.prototype.getProperties=X.prototype.R;X.prototype.set=X.prototype.set;X.prototype.setProperties=X.prototype.I;X.prototype.unset=X.prototype.S;X.prototype.changed=X.prototype.u;X.prototype.dispatchEvent=X.prototype.s;X.prototype.getRevision=X.prototype.L;X.prototype.on=X.prototype.H;X.prototype.once=X.prototype.M;
+X.prototype.un=X.prototype.K;X.prototype.unByKey=X.prototype.N;Pl.prototype.setMap=Pl.prototype.setMap;Pl.prototype.setSource=Pl.prototype.zc;Pl.prototype.getExtent=Pl.prototype.J;Pl.prototype.getMaxResolution=Pl.prototype.Nb;Pl.prototype.getMinResolution=Pl.prototype.Ob;Pl.prototype.getOpacity=Pl.prototype.Rb;Pl.prototype.getVisible=Pl.prototype.rb;Pl.prototype.getZIndex=Pl.prototype.Sb;Pl.prototype.setExtent=Pl.prototype.cc;Pl.prototype.setMaxResolution=Pl.prototype.kc;
+Pl.prototype.setMinResolution=Pl.prototype.lc;Pl.prototype.setOpacity=Pl.prototype.dc;Pl.prototype.setVisible=Pl.prototype.ec;Pl.prototype.setZIndex=Pl.prototype.fc;Pl.prototype.get=Pl.prototype.get;Pl.prototype.getKeys=Pl.prototype.P;Pl.prototype.getProperties=Pl.prototype.R;Pl.prototype.set=Pl.prototype.set;Pl.prototype.setProperties=Pl.prototype.I;Pl.prototype.unset=Pl.prototype.S;Pl.prototype.changed=Pl.prototype.u;Pl.prototype.dispatchEvent=Pl.prototype.s;Pl.prototype.getRevision=Pl.prototype.L;
+Pl.prototype.on=Pl.prototype.H;Pl.prototype.once=Pl.prototype.M;Pl.prototype.un=Pl.prototype.K;Pl.prototype.unByKey=Pl.prototype.N;Hl.prototype.getExtent=Hl.prototype.J;Hl.prototype.getMaxResolution=Hl.prototype.Nb;Hl.prototype.getMinResolution=Hl.prototype.Ob;Hl.prototype.getOpacity=Hl.prototype.Rb;Hl.prototype.getVisible=Hl.prototype.rb;Hl.prototype.getZIndex=Hl.prototype.Sb;Hl.prototype.setExtent=Hl.prototype.cc;Hl.prototype.setMaxResolution=Hl.prototype.kc;Hl.prototype.setMinResolution=Hl.prototype.lc;
+Hl.prototype.setOpacity=Hl.prototype.dc;Hl.prototype.setVisible=Hl.prototype.ec;Hl.prototype.setZIndex=Hl.prototype.fc;Hl.prototype.get=Hl.prototype.get;Hl.prototype.getKeys=Hl.prototype.P;Hl.prototype.getProperties=Hl.prototype.R;Hl.prototype.set=Hl.prototype.set;Hl.prototype.setProperties=Hl.prototype.I;Hl.prototype.unset=Hl.prototype.S;Hl.prototype.changed=Hl.prototype.u;Hl.prototype.dispatchEvent=Hl.prototype.s;Hl.prototype.getRevision=Hl.prototype.L;Hl.prototype.on=Hl.prototype.H;
+Hl.prototype.once=Hl.prototype.M;Hl.prototype.un=Hl.prototype.K;Hl.prototype.unByKey=Hl.prototype.N;G.prototype.setMap=G.prototype.setMap;G.prototype.setSource=G.prototype.zc;G.prototype.getExtent=G.prototype.J;G.prototype.getMaxResolution=G.prototype.Nb;G.prototype.getMinResolution=G.prototype.Ob;G.prototype.getOpacity=G.prototype.Rb;G.prototype.getVisible=G.prototype.rb;G.prototype.getZIndex=G.prototype.Sb;G.prototype.setExtent=G.prototype.cc;G.prototype.setMaxResolution=G.prototype.kc;
+G.prototype.setMinResolution=G.prototype.lc;G.prototype.setOpacity=G.prototype.dc;G.prototype.setVisible=G.prototype.ec;G.prototype.setZIndex=G.prototype.fc;G.prototype.get=G.prototype.get;G.prototype.getKeys=G.prototype.P;G.prototype.getProperties=G.prototype.R;G.prototype.set=G.prototype.set;G.prototype.setProperties=G.prototype.I;G.prototype.unset=G.prototype.S;G.prototype.changed=G.prototype.u;G.prototype.dispatchEvent=G.prototype.s;G.prototype.getRevision=G.prototype.L;G.prototype.on=G.prototype.H;
+G.prototype.once=G.prototype.M;G.prototype.un=G.prototype.K;G.prototype.unByKey=G.prototype.N;I.prototype.getStyle=I.prototype.C;I.prototype.getStyleFunction=I.prototype.D;I.prototype.setStyle=I.prototype.c;I.prototype.setMap=I.prototype.setMap;I.prototype.setSource=I.prototype.zc;I.prototype.getExtent=I.prototype.J;I.prototype.getMaxResolution=I.prototype.Nb;I.prototype.getMinResolution=I.prototype.Ob;I.prototype.getOpacity=I.prototype.Rb;I.prototype.getVisible=I.prototype.rb;
+I.prototype.getZIndex=I.prototype.Sb;I.prototype.setExtent=I.prototype.cc;I.prototype.setMaxResolution=I.prototype.kc;I.prototype.setMinResolution=I.prototype.lc;I.prototype.setOpacity=I.prototype.dc;I.prototype.setVisible=I.prototype.ec;I.prototype.setZIndex=I.prototype.fc;I.prototype.get=I.prototype.get;I.prototype.getKeys=I.prototype.P;I.prototype.getProperties=I.prototype.R;I.prototype.set=I.prototype.set;I.prototype.setProperties=I.prototype.I;I.prototype.unset=I.prototype.S;
+I.prototype.changed=I.prototype.u;I.prototype.dispatchEvent=I.prototype.s;I.prototype.getRevision=I.prototype.L;I.prototype.on=I.prototype.H;I.prototype.once=I.prototype.M;I.prototype.un=I.prototype.K;I.prototype.unByKey=I.prototype.N;Lk.prototype.get=Lk.prototype.get;Lk.prototype.getKeys=Lk.prototype.P;Lk.prototype.getProperties=Lk.prototype.R;Lk.prototype.set=Lk.prototype.set;Lk.prototype.setProperties=Lk.prototype.I;Lk.prototype.unset=Lk.prototype.S;Lk.prototype.changed=Lk.prototype.u;
+Lk.prototype.dispatchEvent=Lk.prototype.s;Lk.prototype.getRevision=Lk.prototype.L;Lk.prototype.on=Lk.prototype.H;Lk.prototype.once=Lk.prototype.M;Lk.prototype.un=Lk.prototype.K;Lk.prototype.unByKey=Lk.prototype.N;Pk.prototype.getActive=Pk.prototype.b;Pk.prototype.getMap=Pk.prototype.i;Pk.prototype.setActive=Pk.prototype.g;Pk.prototype.get=Pk.prototype.get;Pk.prototype.getKeys=Pk.prototype.P;Pk.prototype.getProperties=Pk.prototype.R;Pk.prototype.set=Pk.prototype.set;Pk.prototype.setProperties=Pk.prototype.I;
+Pk.prototype.unset=Pk.prototype.S;Pk.prototype.changed=Pk.prototype.u;Pk.prototype.dispatchEvent=Pk.prototype.s;Pk.prototype.getRevision=Pk.prototype.L;Pk.prototype.on=Pk.prototype.H;Pk.prototype.once=Pk.prototype.M;Pk.prototype.un=Pk.prototype.K;Pk.prototype.unByKey=Pk.prototype.N;qy.prototype.getActive=qy.prototype.b;qy.prototype.getMap=qy.prototype.i;qy.prototype.setActive=qy.prototype.g;qy.prototype.get=qy.prototype.get;qy.prototype.getKeys=qy.prototype.P;qy.prototype.getProperties=qy.prototype.R;
+qy.prototype.set=qy.prototype.set;qy.prototype.setProperties=qy.prototype.I;qy.prototype.unset=qy.prototype.S;qy.prototype.changed=qy.prototype.u;qy.prototype.dispatchEvent=qy.prototype.s;qy.prototype.getRevision=qy.prototype.L;qy.prototype.on=qy.prototype.H;qy.prototype.once=qy.prototype.M;qy.prototype.un=qy.prototype.K;qy.prototype.unByKey=qy.prototype.N;Yk.prototype.getActive=Yk.prototype.b;Yk.prototype.getMap=Yk.prototype.i;Yk.prototype.setActive=Yk.prototype.g;Yk.prototype.get=Yk.prototype.get;
+Yk.prototype.getKeys=Yk.prototype.P;Yk.prototype.getProperties=Yk.prototype.R;Yk.prototype.set=Yk.prototype.set;Yk.prototype.setProperties=Yk.prototype.I;Yk.prototype.unset=Yk.prototype.S;Yk.prototype.changed=Yk.prototype.u;Yk.prototype.dispatchEvent=Yk.prototype.s;Yk.prototype.getRevision=Yk.prototype.L;Yk.prototype.on=Yk.prototype.H;Yk.prototype.once=Yk.prototype.M;Yk.prototype.un=Yk.prototype.K;Yk.prototype.unByKey=Yk.prototype.N;ml.prototype.getActive=ml.prototype.b;ml.prototype.getMap=ml.prototype.i;
+ml.prototype.setActive=ml.prototype.g;ml.prototype.get=ml.prototype.get;ml.prototype.getKeys=ml.prototype.P;ml.prototype.getProperties=ml.prototype.R;ml.prototype.set=ml.prototype.set;ml.prototype.setProperties=ml.prototype.I;ml.prototype.unset=ml.prototype.S;ml.prototype.changed=ml.prototype.u;ml.prototype.dispatchEvent=ml.prototype.s;ml.prototype.getRevision=ml.prototype.L;ml.prototype.on=ml.prototype.H;ml.prototype.once=ml.prototype.M;ml.prototype.un=ml.prototype.K;ml.prototype.unByKey=ml.prototype.N;
+al.prototype.getActive=al.prototype.b;al.prototype.getMap=al.prototype.i;al.prototype.setActive=al.prototype.g;al.prototype.get=al.prototype.get;al.prototype.getKeys=al.prototype.P;al.prototype.getProperties=al.prototype.R;al.prototype.set=al.prototype.set;al.prototype.setProperties=al.prototype.I;al.prototype.unset=al.prototype.S;al.prototype.changed=al.prototype.u;al.prototype.dispatchEvent=al.prototype.s;al.prototype.getRevision=al.prototype.L;al.prototype.on=al.prototype.H;al.prototype.once=al.prototype.M;
+al.prototype.un=al.prototype.K;al.prototype.unByKey=al.prototype.N;uy.prototype.getActive=uy.prototype.b;uy.prototype.getMap=uy.prototype.i;uy.prototype.setActive=uy.prototype.g;uy.prototype.get=uy.prototype.get;uy.prototype.getKeys=uy.prototype.P;uy.prototype.getProperties=uy.prototype.R;uy.prototype.set=uy.prototype.set;uy.prototype.setProperties=uy.prototype.I;uy.prototype.unset=uy.prototype.S;uy.prototype.changed=uy.prototype.u;uy.prototype.dispatchEvent=uy.prototype.s;
+uy.prototype.getRevision=uy.prototype.L;uy.prototype.on=uy.prototype.H;uy.prototype.once=uy.prototype.M;uy.prototype.un=uy.prototype.K;uy.prototype.unByKey=uy.prototype.N;el.prototype.getActive=el.prototype.b;el.prototype.getMap=el.prototype.i;el.prototype.setActive=el.prototype.g;el.prototype.get=el.prototype.get;el.prototype.getKeys=el.prototype.P;el.prototype.getProperties=el.prototype.R;el.prototype.set=el.prototype.set;el.prototype.setProperties=el.prototype.I;el.prototype.unset=el.prototype.S;
+el.prototype.changed=el.prototype.u;el.prototype.dispatchEvent=el.prototype.s;el.prototype.getRevision=el.prototype.L;el.prototype.on=el.prototype.H;el.prototype.once=el.prototype.M;el.prototype.un=el.prototype.K;el.prototype.unByKey=el.prototype.N;rl.prototype.getGeometry=rl.prototype.X;rl.prototype.getActive=rl.prototype.b;rl.prototype.getMap=rl.prototype.i;rl.prototype.setActive=rl.prototype.g;rl.prototype.get=rl.prototype.get;rl.prototype.getKeys=rl.prototype.P;rl.prototype.getProperties=rl.prototype.R;
+rl.prototype.set=rl.prototype.set;rl.prototype.setProperties=rl.prototype.I;rl.prototype.unset=rl.prototype.S;rl.prototype.changed=rl.prototype.u;rl.prototype.dispatchEvent=rl.prototype.s;rl.prototype.getRevision=rl.prototype.L;rl.prototype.on=rl.prototype.H;rl.prototype.once=rl.prototype.M;rl.prototype.un=rl.prototype.K;rl.prototype.unByKey=rl.prototype.N;zy.prototype.getActive=zy.prototype.b;zy.prototype.getMap=zy.prototype.i;zy.prototype.setActive=zy.prototype.g;zy.prototype.get=zy.prototype.get;
+zy.prototype.getKeys=zy.prototype.P;zy.prototype.getProperties=zy.prototype.R;zy.prototype.set=zy.prototype.set;zy.prototype.setProperties=zy.prototype.I;zy.prototype.unset=zy.prototype.S;zy.prototype.changed=zy.prototype.u;zy.prototype.dispatchEvent=zy.prototype.s;zy.prototype.getRevision=zy.prototype.L;zy.prototype.on=zy.prototype.H;zy.prototype.once=zy.prototype.M;zy.prototype.un=zy.prototype.K;zy.prototype.unByKey=zy.prototype.N;sl.prototype.getActive=sl.prototype.b;sl.prototype.getMap=sl.prototype.i;
+sl.prototype.setActive=sl.prototype.g;sl.prototype.get=sl.prototype.get;sl.prototype.getKeys=sl.prototype.P;sl.prototype.getProperties=sl.prototype.R;sl.prototype.set=sl.prototype.set;sl.prototype.setProperties=sl.prototype.I;sl.prototype.unset=sl.prototype.S;sl.prototype.changed=sl.prototype.u;sl.prototype.dispatchEvent=sl.prototype.s;sl.prototype.getRevision=sl.prototype.L;sl.prototype.on=sl.prototype.H;sl.prototype.once=sl.prototype.M;sl.prototype.un=sl.prototype.K;sl.prototype.unByKey=sl.prototype.N;
+ul.prototype.getActive=ul.prototype.b;ul.prototype.getMap=ul.prototype.i;ul.prototype.setActive=ul.prototype.g;ul.prototype.get=ul.prototype.get;ul.prototype.getKeys=ul.prototype.P;ul.prototype.getProperties=ul.prototype.R;ul.prototype.set=ul.prototype.set;ul.prototype.setProperties=ul.prototype.I;ul.prototype.unset=ul.prototype.S;ul.prototype.changed=ul.prototype.u;ul.prototype.dispatchEvent=ul.prototype.s;ul.prototype.getRevision=ul.prototype.L;ul.prototype.on=ul.prototype.H;ul.prototype.once=ul.prototype.M;
+ul.prototype.un=ul.prototype.K;ul.prototype.unByKey=ul.prototype.N;Qy.prototype.getActive=Qy.prototype.b;Qy.prototype.getMap=Qy.prototype.i;Qy.prototype.setActive=Qy.prototype.g;Qy.prototype.get=Qy.prototype.get;Qy.prototype.getKeys=Qy.prototype.P;Qy.prototype.getProperties=Qy.prototype.R;Qy.prototype.set=Qy.prototype.set;Qy.prototype.setProperties=Qy.prototype.I;Qy.prototype.unset=Qy.prototype.S;Qy.prototype.changed=Qy.prototype.u;Qy.prototype.dispatchEvent=Qy.prototype.s;
+Qy.prototype.getRevision=Qy.prototype.L;Qy.prototype.on=Qy.prototype.H;Qy.prototype.once=Qy.prototype.M;Qy.prototype.un=Qy.prototype.K;Qy.prototype.unByKey=Qy.prototype.N;wl.prototype.getActive=wl.prototype.b;wl.prototype.getMap=wl.prototype.i;wl.prototype.setActive=wl.prototype.g;wl.prototype.get=wl.prototype.get;wl.prototype.getKeys=wl.prototype.P;wl.prototype.getProperties=wl.prototype.R;wl.prototype.set=wl.prototype.set;wl.prototype.setProperties=wl.prototype.I;wl.prototype.unset=wl.prototype.S;
+wl.prototype.changed=wl.prototype.u;wl.prototype.dispatchEvent=wl.prototype.s;wl.prototype.getRevision=wl.prototype.L;wl.prototype.on=wl.prototype.H;wl.prototype.once=wl.prototype.M;wl.prototype.un=wl.prototype.K;wl.prototype.unByKey=wl.prototype.N;yl.prototype.getActive=yl.prototype.b;yl.prototype.getMap=yl.prototype.i;yl.prototype.setActive=yl.prototype.g;yl.prototype.get=yl.prototype.get;yl.prototype.getKeys=yl.prototype.P;yl.prototype.getProperties=yl.prototype.R;yl.prototype.set=yl.prototype.set;
+yl.prototype.setProperties=yl.prototype.I;yl.prototype.unset=yl.prototype.S;yl.prototype.changed=yl.prototype.u;yl.prototype.dispatchEvent=yl.prototype.s;yl.prototype.getRevision=yl.prototype.L;yl.prototype.on=yl.prototype.H;yl.prototype.once=yl.prototype.M;yl.prototype.un=yl.prototype.K;yl.prototype.unByKey=yl.prototype.N;Cl.prototype.getActive=Cl.prototype.b;Cl.prototype.getMap=Cl.prototype.i;Cl.prototype.setActive=Cl.prototype.g;Cl.prototype.get=Cl.prototype.get;Cl.prototype.getKeys=Cl.prototype.P;
+Cl.prototype.getProperties=Cl.prototype.R;Cl.prototype.set=Cl.prototype.set;Cl.prototype.setProperties=Cl.prototype.I;Cl.prototype.unset=Cl.prototype.S;Cl.prototype.changed=Cl.prototype.u;Cl.prototype.dispatchEvent=Cl.prototype.s;Cl.prototype.getRevision=Cl.prototype.L;Cl.prototype.on=Cl.prototype.H;Cl.prototype.once=Cl.prototype.M;Cl.prototype.un=Cl.prototype.K;Cl.prototype.unByKey=Cl.prototype.N;dz.prototype.getActive=dz.prototype.b;dz.prototype.getMap=dz.prototype.i;dz.prototype.setActive=dz.prototype.g;
+dz.prototype.get=dz.prototype.get;dz.prototype.getKeys=dz.prototype.P;dz.prototype.getProperties=dz.prototype.R;dz.prototype.set=dz.prototype.set;dz.prototype.setProperties=dz.prototype.I;dz.prototype.unset=dz.prototype.S;dz.prototype.changed=dz.prototype.u;dz.prototype.dispatchEvent=dz.prototype.s;dz.prototype.getRevision=dz.prototype.L;dz.prototype.on=dz.prototype.H;dz.prototype.once=dz.prototype.M;dz.prototype.un=dz.prototype.K;dz.prototype.unByKey=dz.prototype.N;gz.prototype.getActive=gz.prototype.b;
+gz.prototype.getMap=gz.prototype.i;gz.prototype.setActive=gz.prototype.g;gz.prototype.get=gz.prototype.get;gz.prototype.getKeys=gz.prototype.P;gz.prototype.getProperties=gz.prototype.R;gz.prototype.set=gz.prototype.set;gz.prototype.setProperties=gz.prototype.I;gz.prototype.unset=gz.prototype.S;gz.prototype.changed=gz.prototype.u;gz.prototype.dispatchEvent=gz.prototype.s;gz.prototype.getRevision=gz.prototype.L;gz.prototype.on=gz.prototype.H;gz.prototype.once=gz.prototype.M;gz.prototype.un=gz.prototype.K;
+gz.prototype.unByKey=gz.prototype.N;lz.prototype.getActive=lz.prototype.b;lz.prototype.getMap=lz.prototype.i;lz.prototype.setActive=lz.prototype.g;lz.prototype.get=lz.prototype.get;lz.prototype.getKeys=lz.prototype.P;lz.prototype.getProperties=lz.prototype.R;lz.prototype.set=lz.prototype.set;lz.prototype.setProperties=lz.prototype.I;lz.prototype.unset=lz.prototype.S;lz.prototype.changed=lz.prototype.u;lz.prototype.dispatchEvent=lz.prototype.s;lz.prototype.getRevision=lz.prototype.L;
+lz.prototype.on=lz.prototype.H;lz.prototype.once=lz.prototype.M;lz.prototype.un=lz.prototype.K;lz.prototype.unByKey=lz.prototype.N;$e.prototype.get=$e.prototype.get;$e.prototype.getKeys=$e.prototype.P;$e.prototype.getProperties=$e.prototype.R;$e.prototype.set=$e.prototype.set;$e.prototype.setProperties=$e.prototype.I;$e.prototype.unset=$e.prototype.S;$e.prototype.changed=$e.prototype.u;$e.prototype.dispatchEvent=$e.prototype.s;$e.prototype.getRevision=$e.prototype.L;$e.prototype.on=$e.prototype.H;
+$e.prototype.once=$e.prototype.M;$e.prototype.un=$e.prototype.K;$e.prototype.unByKey=$e.prototype.N;bf.prototype.getClosestPoint=bf.prototype.qb;bf.prototype.getExtent=bf.prototype.J;bf.prototype.simplify=bf.prototype.xb;bf.prototype.transform=bf.prototype.lb;bf.prototype.get=bf.prototype.get;bf.prototype.getKeys=bf.prototype.P;bf.prototype.getProperties=bf.prototype.R;bf.prototype.set=bf.prototype.set;bf.prototype.setProperties=bf.prototype.I;bf.prototype.unset=bf.prototype.S;
+bf.prototype.changed=bf.prototype.u;bf.prototype.dispatchEvent=bf.prototype.s;bf.prototype.getRevision=bf.prototype.L;bf.prototype.on=bf.prototype.H;bf.prototype.once=bf.prototype.M;bf.prototype.un=bf.prototype.K;bf.prototype.unByKey=bf.prototype.N;Nx.prototype.getFirstCoordinate=Nx.prototype.Kb;Nx.prototype.getLastCoordinate=Nx.prototype.Lb;Nx.prototype.getLayout=Nx.prototype.Mb;Nx.prototype.getClosestPoint=Nx.prototype.qb;Nx.prototype.getExtent=Nx.prototype.J;Nx.prototype.simplify=Nx.prototype.xb;
+Nx.prototype.get=Nx.prototype.get;Nx.prototype.getKeys=Nx.prototype.P;Nx.prototype.getProperties=Nx.prototype.R;Nx.prototype.set=Nx.prototype.set;Nx.prototype.setProperties=Nx.prototype.I;Nx.prototype.unset=Nx.prototype.S;Nx.prototype.changed=Nx.prototype.u;Nx.prototype.dispatchEvent=Nx.prototype.s;Nx.prototype.getRevision=Nx.prototype.L;Nx.prototype.on=Nx.prototype.H;Nx.prototype.once=Nx.prototype.M;Nx.prototype.un=Nx.prototype.K;Nx.prototype.unByKey=Nx.prototype.N;gs.prototype.getClosestPoint=gs.prototype.qb;
+gs.prototype.getExtent=gs.prototype.J;gs.prototype.simplify=gs.prototype.xb;gs.prototype.transform=gs.prototype.lb;gs.prototype.get=gs.prototype.get;gs.prototype.getKeys=gs.prototype.P;gs.prototype.getProperties=gs.prototype.R;gs.prototype.set=gs.prototype.set;gs.prototype.setProperties=gs.prototype.I;gs.prototype.unset=gs.prototype.S;gs.prototype.changed=gs.prototype.u;gs.prototype.dispatchEvent=gs.prototype.s;gs.prototype.getRevision=gs.prototype.L;gs.prototype.on=gs.prototype.H;
+gs.prototype.once=gs.prototype.M;gs.prototype.un=gs.prototype.K;gs.prototype.unByKey=gs.prototype.N;vf.prototype.getFirstCoordinate=vf.prototype.Kb;vf.prototype.getLastCoordinate=vf.prototype.Lb;vf.prototype.getLayout=vf.prototype.Mb;vf.prototype.getClosestPoint=vf.prototype.qb;vf.prototype.getExtent=vf.prototype.J;vf.prototype.simplify=vf.prototype.xb;vf.prototype.transform=vf.prototype.lb;vf.prototype.get=vf.prototype.get;vf.prototype.getKeys=vf.prototype.P;vf.prototype.getProperties=vf.prototype.R;
+vf.prototype.set=vf.prototype.set;vf.prototype.setProperties=vf.prototype.I;vf.prototype.unset=vf.prototype.S;vf.prototype.changed=vf.prototype.u;vf.prototype.dispatchEvent=vf.prototype.s;vf.prototype.getRevision=vf.prototype.L;vf.prototype.on=vf.prototype.H;vf.prototype.once=vf.prototype.M;vf.prototype.un=vf.prototype.K;vf.prototype.unByKey=vf.prototype.N;T.prototype.getFirstCoordinate=T.prototype.Kb;T.prototype.getLastCoordinate=T.prototype.Lb;T.prototype.getLayout=T.prototype.Mb;
+T.prototype.getClosestPoint=T.prototype.qb;T.prototype.getExtent=T.prototype.J;T.prototype.simplify=T.prototype.xb;T.prototype.transform=T.prototype.lb;T.prototype.get=T.prototype.get;T.prototype.getKeys=T.prototype.P;T.prototype.getProperties=T.prototype.R;T.prototype.set=T.prototype.set;T.prototype.setProperties=T.prototype.I;T.prototype.unset=T.prototype.S;T.prototype.changed=T.prototype.u;T.prototype.dispatchEvent=T.prototype.s;T.prototype.getRevision=T.prototype.L;T.prototype.on=T.prototype.H;
+T.prototype.once=T.prototype.M;T.prototype.un=T.prototype.K;T.prototype.unByKey=T.prototype.N;U.prototype.getFirstCoordinate=U.prototype.Kb;U.prototype.getLastCoordinate=U.prototype.Lb;U.prototype.getLayout=U.prototype.Mb;U.prototype.getClosestPoint=U.prototype.qb;U.prototype.getExtent=U.prototype.J;U.prototype.simplify=U.prototype.xb;U.prototype.transform=U.prototype.lb;U.prototype.get=U.prototype.get;U.prototype.getKeys=U.prototype.P;U.prototype.getProperties=U.prototype.R;U.prototype.set=U.prototype.set;
+U.prototype.setProperties=U.prototype.I;U.prototype.unset=U.prototype.S;U.prototype.changed=U.prototype.u;U.prototype.dispatchEvent=U.prototype.s;U.prototype.getRevision=U.prototype.L;U.prototype.on=U.prototype.H;U.prototype.once=U.prototype.M;U.prototype.un=U.prototype.K;U.prototype.unByKey=U.prototype.N;Xr.prototype.getFirstCoordinate=Xr.prototype.Kb;Xr.prototype.getLastCoordinate=Xr.prototype.Lb;Xr.prototype.getLayout=Xr.prototype.Mb;Xr.prototype.getClosestPoint=Xr.prototype.qb;
+Xr.prototype.getExtent=Xr.prototype.J;Xr.prototype.simplify=Xr.prototype.xb;Xr.prototype.transform=Xr.prototype.lb;Xr.prototype.get=Xr.prototype.get;Xr.prototype.getKeys=Xr.prototype.P;Xr.prototype.getProperties=Xr.prototype.R;Xr.prototype.set=Xr.prototype.set;Xr.prototype.setProperties=Xr.prototype.I;Xr.prototype.unset=Xr.prototype.S;Xr.prototype.changed=Xr.prototype.u;Xr.prototype.dispatchEvent=Xr.prototype.s;Xr.prototype.getRevision=Xr.prototype.L;Xr.prototype.on=Xr.prototype.H;
+Xr.prototype.once=Xr.prototype.M;Xr.prototype.un=Xr.prototype.K;Xr.prototype.unByKey=Xr.prototype.N;V.prototype.getFirstCoordinate=V.prototype.Kb;V.prototype.getLastCoordinate=V.prototype.Lb;V.prototype.getLayout=V.prototype.Mb;V.prototype.getClosestPoint=V.prototype.qb;V.prototype.getExtent=V.prototype.J;V.prototype.simplify=V.prototype.xb;V.prototype.transform=V.prototype.lb;V.prototype.get=V.prototype.get;V.prototype.getKeys=V.prototype.P;V.prototype.getProperties=V.prototype.R;
+V.prototype.set=V.prototype.set;V.prototype.setProperties=V.prototype.I;V.prototype.unset=V.prototype.S;V.prototype.changed=V.prototype.u;V.prototype.dispatchEvent=V.prototype.s;V.prototype.getRevision=V.prototype.L;V.prototype.on=V.prototype.H;V.prototype.once=V.prototype.M;V.prototype.un=V.prototype.K;V.prototype.unByKey=V.prototype.N;E.prototype.getFirstCoordinate=E.prototype.Kb;E.prototype.getLastCoordinate=E.prototype.Lb;E.prototype.getLayout=E.prototype.Mb;E.prototype.getClosestPoint=E.prototype.qb;
+E.prototype.getExtent=E.prototype.J;E.prototype.simplify=E.prototype.xb;E.prototype.transform=E.prototype.lb;E.prototype.get=E.prototype.get;E.prototype.getKeys=E.prototype.P;E.prototype.getProperties=E.prototype.R;E.prototype.set=E.prototype.set;E.prototype.setProperties=E.prototype.I;E.prototype.unset=E.prototype.S;E.prototype.changed=E.prototype.u;E.prototype.dispatchEvent=E.prototype.s;E.prototype.getRevision=E.prototype.L;E.prototype.on=E.prototype.H;E.prototype.once=E.prototype.M;
+E.prototype.un=E.prototype.K;E.prototype.unByKey=E.prototype.N;F.prototype.getFirstCoordinate=F.prototype.Kb;F.prototype.getLastCoordinate=F.prototype.Lb;F.prototype.getLayout=F.prototype.Mb;F.prototype.getClosestPoint=F.prototype.qb;F.prototype.getExtent=F.prototype.J;F.prototype.simplify=F.prototype.xb;F.prototype.transform=F.prototype.lb;F.prototype.get=F.prototype.get;F.prototype.getKeys=F.prototype.P;F.prototype.getProperties=F.prototype.R;F.prototype.set=F.prototype.set;
+F.prototype.setProperties=F.prototype.I;F.prototype.unset=F.prototype.S;F.prototype.changed=F.prototype.u;F.prototype.dispatchEvent=F.prototype.s;F.prototype.getRevision=F.prototype.L;F.prototype.on=F.prototype.H;F.prototype.once=F.prototype.M;F.prototype.un=F.prototype.K;F.prototype.unByKey=F.prototype.N;Es.prototype.readFeatures=Es.prototype.Ba;Fs.prototype.readFeatures=Fs.prototype.Ba;Fs.prototype.readFeatures=Fs.prototype.Ba;oh.prototype.get=oh.prototype.get;oh.prototype.getKeys=oh.prototype.P;
+oh.prototype.getProperties=oh.prototype.R;oh.prototype.set=oh.prototype.set;oh.prototype.setProperties=oh.prototype.I;oh.prototype.unset=oh.prototype.S;oh.prototype.changed=oh.prototype.u;oh.prototype.dispatchEvent=oh.prototype.s;oh.prototype.getRevision=oh.prototype.L;oh.prototype.on=oh.prototype.H;oh.prototype.once=oh.prototype.M;oh.prototype.un=oh.prototype.K;oh.prototype.unByKey=oh.prototype.N;Rh.prototype.getMap=Rh.prototype.g;Rh.prototype.setMap=Rh.prototype.setMap;Rh.prototype.setTarget=Rh.prototype.c;
+Rh.prototype.get=Rh.prototype.get;Rh.prototype.getKeys=Rh.prototype.P;Rh.prototype.getProperties=Rh.prototype.R;Rh.prototype.set=Rh.prototype.set;Rh.prototype.setProperties=Rh.prototype.I;Rh.prototype.unset=Rh.prototype.S;Rh.prototype.changed=Rh.prototype.u;Rh.prototype.dispatchEvent=Rh.prototype.s;Rh.prototype.getRevision=Rh.prototype.L;Rh.prototype.on=Rh.prototype.H;Rh.prototype.once=Rh.prototype.M;Rh.prototype.un=Rh.prototype.K;Rh.prototype.unByKey=Rh.prototype.N;bi.prototype.getMap=bi.prototype.g;
+bi.prototype.setMap=bi.prototype.setMap;bi.prototype.setTarget=bi.prototype.c;bi.prototype.get=bi.prototype.get;bi.prototype.getKeys=bi.prototype.P;bi.prototype.getProperties=bi.prototype.R;bi.prototype.set=bi.prototype.set;bi.prototype.setProperties=bi.prototype.I;bi.prototype.unset=bi.prototype.S;bi.prototype.changed=bi.prototype.u;bi.prototype.dispatchEvent=bi.prototype.s;bi.prototype.getRevision=bi.prototype.L;bi.prototype.on=bi.prototype.H;bi.prototype.once=bi.prototype.M;bi.prototype.un=bi.prototype.K;
+bi.prototype.unByKey=bi.prototype.N;di.prototype.getMap=di.prototype.g;di.prototype.setMap=di.prototype.setMap;di.prototype.setTarget=di.prototype.c;di.prototype.get=di.prototype.get;di.prototype.getKeys=di.prototype.P;di.prototype.getProperties=di.prototype.R;di.prototype.set=di.prototype.set;di.prototype.setProperties=di.prototype.I;di.prototype.unset=di.prototype.S;di.prototype.changed=di.prototype.u;di.prototype.dispatchEvent=di.prototype.s;di.prototype.getRevision=di.prototype.L;
+di.prototype.on=di.prototype.H;di.prototype.once=di.prototype.M;di.prototype.un=di.prototype.K;di.prototype.unByKey=di.prototype.N;nr.prototype.getMap=nr.prototype.g;nr.prototype.setMap=nr.prototype.setMap;nr.prototype.setTarget=nr.prototype.c;nr.prototype.get=nr.prototype.get;nr.prototype.getKeys=nr.prototype.P;nr.prototype.getProperties=nr.prototype.R;nr.prototype.set=nr.prototype.set;nr.prototype.setProperties=nr.prototype.I;nr.prototype.unset=nr.prototype.S;nr.prototype.changed=nr.prototype.u;
+nr.prototype.dispatchEvent=nr.prototype.s;nr.prototype.getRevision=nr.prototype.L;nr.prototype.on=nr.prototype.H;nr.prototype.once=nr.prototype.M;nr.prototype.un=nr.prototype.K;nr.prototype.unByKey=nr.prototype.N;Uh.prototype.getMap=Uh.prototype.g;Uh.prototype.setMap=Uh.prototype.setMap;Uh.prototype.setTarget=Uh.prototype.c;Uh.prototype.get=Uh.prototype.get;Uh.prototype.getKeys=Uh.prototype.P;Uh.prototype.getProperties=Uh.prototype.R;Uh.prototype.set=Uh.prototype.set;Uh.prototype.setProperties=Uh.prototype.I;
+Uh.prototype.unset=Uh.prototype.S;Uh.prototype.changed=Uh.prototype.u;Uh.prototype.dispatchEvent=Uh.prototype.s;Uh.prototype.getRevision=Uh.prototype.L;Uh.prototype.on=Uh.prototype.H;Uh.prototype.once=Uh.prototype.M;Uh.prototype.un=Uh.prototype.K;Uh.prototype.unByKey=Uh.prototype.N;sr.prototype.getMap=sr.prototype.g;sr.prototype.setMap=sr.prototype.setMap;sr.prototype.setTarget=sr.prototype.c;sr.prototype.get=sr.prototype.get;sr.prototype.getKeys=sr.prototype.P;sr.prototype.getProperties=sr.prototype.R;
+sr.prototype.set=sr.prototype.set;sr.prototype.setProperties=sr.prototype.I;sr.prototype.unset=sr.prototype.S;sr.prototype.changed=sr.prototype.u;sr.prototype.dispatchEvent=sr.prototype.s;sr.prototype.getRevision=sr.prototype.L;sr.prototype.on=sr.prototype.H;sr.prototype.once=sr.prototype.M;sr.prototype.un=sr.prototype.K;sr.prototype.unByKey=sr.prototype.N;Wh.prototype.getMap=Wh.prototype.g;Wh.prototype.setMap=Wh.prototype.setMap;Wh.prototype.setTarget=Wh.prototype.c;Wh.prototype.get=Wh.prototype.get;
+Wh.prototype.getKeys=Wh.prototype.P;Wh.prototype.getProperties=Wh.prototype.R;Wh.prototype.set=Wh.prototype.set;Wh.prototype.setProperties=Wh.prototype.I;Wh.prototype.unset=Wh.prototype.S;Wh.prototype.changed=Wh.prototype.u;Wh.prototype.dispatchEvent=Wh.prototype.s;Wh.prototype.getRevision=Wh.prototype.L;Wh.prototype.on=Wh.prototype.H;Wh.prototype.once=Wh.prototype.M;Wh.prototype.un=Wh.prototype.K;Wh.prototype.unByKey=Wh.prototype.N;Gr.prototype.getMap=Gr.prototype.g;Gr.prototype.setMap=Gr.prototype.setMap;
+Gr.prototype.setTarget=Gr.prototype.c;Gr.prototype.get=Gr.prototype.get;Gr.prototype.getKeys=Gr.prototype.P;Gr.prototype.getProperties=Gr.prototype.R;Gr.prototype.set=Gr.prototype.set;Gr.prototype.setProperties=Gr.prototype.I;Gr.prototype.unset=Gr.prototype.S;Gr.prototype.changed=Gr.prototype.u;Gr.prototype.dispatchEvent=Gr.prototype.s;Gr.prototype.getRevision=Gr.prototype.L;Gr.prototype.on=Gr.prototype.H;Gr.prototype.once=Gr.prototype.M;Gr.prototype.un=Gr.prototype.K;Gr.prototype.unByKey=Gr.prototype.N;
+Lr.prototype.getMap=Lr.prototype.g;Lr.prototype.setMap=Lr.prototype.setMap;Lr.prototype.setTarget=Lr.prototype.c;Lr.prototype.get=Lr.prototype.get;Lr.prototype.getKeys=Lr.prototype.P;Lr.prototype.getProperties=Lr.prototype.R;Lr.prototype.set=Lr.prototype.set;Lr.prototype.setProperties=Lr.prototype.I;Lr.prototype.unset=Lr.prototype.S;Lr.prototype.changed=Lr.prototype.u;Lr.prototype.dispatchEvent=Lr.prototype.s;Lr.prototype.getRevision=Lr.prototype.L;Lr.prototype.on=Lr.prototype.H;
+Lr.prototype.once=Lr.prototype.M;Lr.prototype.un=Lr.prototype.K;Lr.prototype.unByKey=Lr.prototype.N;
+  return OPENLAYERS.ol;
+}));
+