Add ChromeVox panel and implement caption display functionality.

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 335 matching lines @@
       case 'showContextMenu':
         if (this.currentRange_) {
           var actionNode = this.currentRange_.start.node;
           if (actionNode.role == RoleType.inlineTextBox)
             actionNode = actionNode.parent;
           actionNode.showContextMenu();
           return false;
         }
         break;
       case 'showOptionsPage':
-        var optionsPage = {url: 'chromevox/background/options.html'};
-        chrome.tabs.create(optionsPage);
+        chrome.runtime.openOptionsPage();
         break;
       case 'toggleChromeVoxVersion':
         var newMode;
         if (this.mode_ == ChromeVoxMode.FORCE_NEXT) {
           var inViews =
               this.currentRange_.start.node.root.role == RoleType.desktop;
           newMode = inViews ? ChromeVoxMode.COMPAT : ChromeVoxMode.CLASSIC;
         } else {
           newMode = ChromeVoxMode.FORCE_NEXT;
         }
@@ skipping 37 matching lines @@
 
       new Output().withSpeechAndBraille(
               this.currentRange_, prevRange, Output.EventType.NAVIGATE)
           .go();
     }
 
     return false;
   },
 
   /**
+   * Open the options page in a new tab.
+   */
+  showOptionsPage: function() {
+    var optionsPage = {url: 'chromevox/background/options.html'};
+    chrome.tabs.create(optionsPage);
+  },
+
+  /**
    * Handles a braille command.
    * @param {!cvox.BrailleKeyEvent} evt
    * @param {!cvox.NavBraille} content
    * @return {boolean} True if evt was processed.
    */
   onBrailleKeyEvent: function(evt, content) {
     if (this.mode_ === ChromeVoxMode.CLASSIC)
       return false;
 
     switch (evt.command) {
@@ skipping 214 matching lines @@
     return glob.replace(/[.+^$(){}|[\]\\]/g, '\\$&')
         .replace(/\*/g, '.*')
         .replace(/\?/g, '.');
   }).join('|') + ')$');
 };
 
 /** @type {Background} */
 global.backgroundObj = new Background();
 
 });  // goog.scope