Ensure only one instance of AutomationInternalCustomBindings for background page extensions

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

 // Copyright 2015 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 ChromeVox panel and menus.
  */
 
 goog.provide('Panel');
 
@@ skipping 147 matching lines @@
   $('close_tutorial').addEventListener('click', Panel.onCloseTutorial, false);
 
   document.addEventListener('keydown', Panel.onKeyDown, false);
   document.addEventListener('mouseup', Panel.onMouseUp, false);
   window.addEventListener('blur', function(evt) {
     if (evt.target != window || document.activeElement == document.body)
       return;
 
     Panel.closeMenusAndRestoreFocus();
   }, false);
+
+  /** @type {Window} */
+  Panel.ownerWindow = window;
 };
 
 /**
  * Update the display based on prefs.
  */
 Panel.updateFromPrefs = function() {
   if (Panel.mode_ == Panel.Mode.SEARCH) {
     this.speechContainer_.hidden = true;
     this.brailleContainer_.hidden = true;
     this.searchContainer_.hidden = false;
@@ skipping 106 matching lines @@
 Panel.setMode = function(mode) {
   if (this.mode_ == mode)
     return;
 
   if (this.isUserSessionBlocked_ &&
       mode != Panel.Mode.COLLAPSED && mode != Panel.Mode.FOCUSED)
     return;
   this.mode_ = mode;
 
   document.title = Msgs.getMsg(Panel.ModeInfo[this.mode_].title);
-  window.location = Panel.ModeInfo[this.mode_].location;
+
+  // Fully qualify the path here because this function might be called with a
+  // window object belonging to the background page.
+  Panel.ownerWindow.location =
+      chrome.extension.getURL('cvox2/background/panel.html') +
+      Panel.ModeInfo[this.mode_].location;
+
   $('main').hidden = (this.mode_ == Panel.Mode.FULLSCREEN_TUTORIAL);
   $('menus_background').hidden = (this.mode_ != Panel.Mode.FULLSCREEN_MENUS);
   $('tutorial').hidden = (this.mode_ != Panel.Mode.FULLSCREEN_TUTORIAL);
 };
 
 /**
  * Open / show the ChromeVox Menus.
  * @param {Event=} opt_event An optional event that triggered this.
  * @param {*=} opt_activateMenuTitle Title msg id of menu to open.
  */
@@ skipping 492 matching lines @@
   bkgnd['showOptionsPage']();
   Panel.setMode(Panel.Mode.COLLAPSED);
 };
 
 /**
  * Exit ChromeVox.
  */
 Panel.onClose = function() {
   // Change the url fragment to 'close', which signals the native code
   // to exit ChromeVox.
-  window.location = '#close';
+  Panel.ownerWindow.location =
+      chrome.extension.getURL('cvox2/background/panel.html') + '#close';
 };
 
 /**
  * Get the callback for whatever item is currently selected.
  * @return {Function} The callback for the current item.
  */
 Panel.getCallbackForCurrentItem = function() {
   if (this.activeMenu_)
     return this.activeMenu_.getCallbackForCurrentItem();
   return null;
 };
 
 /**
  * Close the menus and restore focus to the page. If a menu item's callback
  * was queued, execute it once focus is restored.
  */
 Panel.closeMenusAndRestoreFocus = function() {
   // Watch for the next focus event.
   var onFocus = function(desktop, evt) {
     desktop.removeEventListener(chrome.automation.EventType.FOCUS, onFocus);
     if (Panel.pendingCallback_) {
       // Clear it before calling it, in case the callback itself triggers
       // another pending callback.
       var pendingCallback = Panel.pendingCallback_;
       Panel.pendingCallback_ = null;
       pendingCallback();
     }
   }.bind(this);
 
-  chrome.automation.getDesktop(function(desktop) {
+  var bkgnd = chrome.extension.getBackgroundPage();
+  bkgnd.chrome.automation.getDesktop(function(desktop) {
     onFocus = /** @type {function(chrome.automation.AutomationEvent)} */(
         onFocus.bind(this, desktop));
     desktop.addEventListener(chrome.automation.EventType.FOCUS,
                              onFocus,
                              true);
 
     // Make sure all menus are cleared to avoid bogous output when we re-open.
     Panel.clearMenus();
 
     // Make sure we're not in full-screen mode.
@@ skipping 52 matching lines @@
 }, false);
 
 window.addEventListener('hashchange', function() {
   if (location.hash == '#fullscreen' || location.hash == '#focus') {
     this.originalStickyState_ = cvox.ChromeVox.isStickyPrefOn;
     cvox.ChromeVox.isStickyPrefOn = false;
   } else {
     cvox.ChromeVox.isStickyPrefOn = this.originalStickyState_;
   }
 }, false);