Begin using ChromeVox Next to read tab and window titles.

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 236 matching lines @@
     // the progress loading sound just in case.
     if ((this.mode_ === ChromeVoxMode.NEXT ||
          this.mode_ === ChromeVoxMode.FORCE_NEXT) &&
         this.mode_ != mode) {
       cvox.ChromeVox.earcons.cancelEarcon(cvox.Earcon.PAGE_START_LOADING);
     }
 
     if (mode === ChromeVoxMode.NEXT ||
         mode === ChromeVoxMode.FORCE_NEXT) {
       (new PanelCommand(PanelCommandType.ENABLE_MENUS)).send();
+      if (cvox.TabsApiHandler)
+        cvox.TabsApiHandler.shouldOutputSpeechAndBraille = false;
     } else {
       (new PanelCommand(PanelCommandType.DISABLE_MENUS)).send();
+      if (cvox.TabsApiHandler)
+        cvox.TabsApiHandler.shouldOutputSpeechAndBraille = true;
     }
 
     // If switching to Classic from any automation-API-based mode,
     // clear the focus ring.
     if (mode === ChromeVoxMode.CLASSIC && mode != this.mode_) {
       if (cvox.ChromeVox.isChromeOS)
         chrome.accessibilityPrivate.setFocusRing([]);
     }
 
     // If switching away from Classic to any automation-API-based mode,
@@ skipping 42 matching lines @@
       }
     }
 
     this.setMode(mode);
   },
 
   /**
    * @override
    */
   getCurrentRange: function() {
-    return this.currentRange_;
+    if (this.currentRange_ && this.currentRange_.isValid())
+      return this.currentRange_;
+    return null;
   },
 
   /**
    * @override
    */
   setCurrentRange: function(newRange) {
     if (!newRange)
       return;
 
     // Is the range invalid?
@@ skipping 786 matching lines @@
     return glob.replace(/[.+^$(){}|[\]\\]/g, '\\$&')
         .replace(/\*/g, '.*')
         .replace(/\?/g, '.');
   }).join('|') + ')$');
 };
 
 /** @type {Background} */
 global.backgroundObj = new Background();
 
 });  // goog.scope