Update third_party/document_image_extractor

third_party/document_image_extractor/third_party/closure-library/closure/goog/events/events.js

Index: third_party/document_image_extractor/third_party/closure-library/closure/goog/events/events.js
diff --git a/third_party/document_image_extractor/third_party/closure-library/closure/goog/events/events.js b/third_party/document_image_extractor/third_party/closure-library/closure/goog/events/events.js
deleted file mode 100644
index 7687b5c3e6d5fefda2810c98959aaae24e9c2e34..0000000000000000000000000000000000000000
--- a/third_party/document_image_extractor/third_party/closure-library/closure/goog/events/events.js
+++ /dev/null
@@ -1,983 +0,0 @@
-// 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.require('goog.debug.ErrorHandler');
-goog.require('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 {
-    // The else above used to be else if (src.attachEvent) and then there was
-    // another else statement that threw an exception warning the developer
-    // they made a mistake. This resulted in an extra object allocation in IE6
-    // due to a wrapper object that had to be implemented around the element
-    // and so was removed.
-    src.attachEvent(goog.events.getOnString_(type.toString()), proxy);
-  }
-
-  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 = /** @type {goog.events.ListenableKey} */ (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_);
-    });