Add layout switcher for virtual keyboard.

chrome/test/data/webui/mock_timer.js

 // Copyright 2013 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.
 
 /**
  * Overrides timeout and interval callbacks to mock timing behavior.
  * @constructor
  */
 function MockTimer() {
   /**
    * Default versions of the timing functions.
    * @type {Object.<string, !Function>}
    * @private
    */
   this.originals_ = [];
 
   /**
    * Key to assign on the next creation of a scheduled timer. Each call to
    * setTimeout or setInterval returns a unique key that can be used for
    * clearing the timer.
    * @type {number}
    * @private
    */
-  this.nextTimerKey_ = 0;
+  this.nextTimerKey_ = 1;
 
   /**
    * Details for active timers.
    * @type {Array.<{callback: Function,
    *                delay: number,
    *                key: number,
    *                repeats: boolean}>}
    * @private
    */
   this.timers_ =  [];
@@ skipping 165 matching lines @@
       details.callback.apply(window);
       if (details.repeats)
         this.scheduleTask_(details);
       else
         this.clearTimeout_(details.key);
     }
     this.now_ = this.until_;
   },
 
 };