Add a |contentEquals| method to cursors and ranges.

chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.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 Handles automation from a desktop automation node.
  */
 
 goog.provide('DesktopAutomationHandler');
 
@@ skipping 122 matching lines @@
 
   /**
    * @param {!AutomationEvent} evt
    */
   onEventIfInRange: function(evt) {
     if (evt.target.root.role != RoleType.desktop &&
         ChromeVoxState.instance.mode === ChromeVoxMode.CLASSIC)
       return;
 
     var prev = ChromeVoxState.instance.currentRange;
-    if (AutomationUtil.isDescendantOf(prev.start.node, evt.target) ||
-        AutomationUtil.isDescendantOf(evt.target, prev.start.node) ||
+    if (prev.contentEquals(cursors.Range.fromNode(evt.target)) ||
         evt.target.state.focused) {
       // Intentionally skip setting range.
       new Output()
           .withRichSpeechAndBraille(cursors.Range.fromNode(evt.target),
                                     prev,
                                     Output.EventType.NAVIGATE)
           .go();
     }
   },
 
@@ skipping 300 matching lines @@
 DesktopAutomationHandler.init_ = function() {
   chrome.automation.getDesktop(function(desktop) {
     ChromeVoxState.desktopAutomationHandler =
         new DesktopAutomationHandler(desktop);
   });
 };
 
 DesktopAutomationHandler.init_();
 
 });  // goog.scope