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diff --git a/chrome/browser/resources/shared/js/cr/event.js b/chrome/browser/resources/shared/js/cr/event.js
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+++ b/chrome/browser/resources/shared/js/cr/event.js
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+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview This provides a nicer way to create events than what DOM
+ * provides. These events can be used with DOM EventTarget interfaces as well
+ * as with {@code cr.EventTarget}.
+ */
+
+cr.define('cr', function() {
+
+  // cr.Event is called CrEvent in here to prevent naming conflicts. We also
+  // store the original Event in case someone does a global alias of cr.Event.
+
+  const DomEvent = Event;
+
+  /**
+   * Creates a new event to be used with cr.EventTarget or DOM EventTarget
+   * objects.
+   * @param {string} type The name of the event.
+   * @param {boolean=} opt_bubbles Whether the event bubbles. Default is false.
+   * @param {boolean=} opt_preventable Whether the default action of the event
+   *     can be prevented.
+   * @constructor
+   * @extends {DomEvent}
+   */
+  function CrEvent(type, opt_bubbles, opt_preventable) {
+    var e = cr.doc.createEvent('Event');
+    e.initEvent(type, !!opt_bubbles, !!opt_preventable);
+    e.__proto__ = CrEvent.prototype;
+    return e;
+  }
+
+  CrEvent.prototype = {
+    __proto__: DomEvent.prototype
+  };
+
+  // Export
+  return {
+    Event: CrEvent
+  };
+});