Define a minimum time for double tap in ChromeVox.

chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js

 // Copyright 2014 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 The entry point for all ChromeVox2 related code for the
  * background page.
  */
 
 goog.provide('Background');
@@ skipping 131 matching lines @@
   this.inExcursion_ = false;
 
   /**
    * Stores the mode as computed the last time a current range was set.
    * @type {?ChromeVoxMode}
    */
   this.mode_ = null;
 
   chrome.accessibilityPrivate.onAccessibilityGesture.addListener(
       this.onAccessibilityGesture_);
-  Notifications.onStartup();
 };
 
 /**
  * @const {string}
  */
 Background.ISSUE_URL = 'https://code.google.com/p/chromium/issues/entry?' +
     'labels=Type-Bug,Pri-2,cvox2,OS-Chrome&' +
     'components=UI>accessibility&' +
     'description=';
 
@@ skipping 168 matching lines @@
     localStorage['useNext'] = useNext;
     if (useNext)
       this.setCurrentRangeToFocus_();
     else
       this.setCurrentRange(null);
 
     var announce = Msgs.getMsg(useNext ?
         'switch_to_next' : 'switch_to_classic');
     cvox.ChromeVox.tts.speak(
         announce, cvox.QueueMode.FLUSH, {doNotInterrupt: true});
-    Notifications.onModeChange();
 
     // If the new mode is Classic, return false now so we don't announce
     // anything more.
     return useNext;
   },
 
   /**
    * @override
    */
   getCurrentRange: function() {
@@ skipping 881 matching lines @@
   return new RegExp('^(' + globs.map(function(glob) {
     return glob.replace(/[.+^$(){}|[\]\\]/g, '\\$&')
         .replace(/\*/g, '.*')
         .replace(/\?/g, '.');
   }).join('|') + ')$');
 };
 
 new Background();
 
 });  // goog.scope