Add a |skipInitialAncestry| option to tree walking.

chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_util.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 ChromeVox utilities for the automation extension API.
  */
 
 goog.provide('AutomationUtil');
 
@@ skipping 85 matching lines @@
       root: undefined,
       visit: undefined,
       skipInitialSubtree: !AutomationPredicate.container(cur)};
   restrictions.leaf = opt_restrictions.leaf || function(node) {
     // Treat nodes matched by |pred| as leaves except for containers.
     return !AutomationPredicate.container(node) && pred(node);
   };
 
   restrictions.root = opt_restrictions.root || AutomationUtil.isTraversalRoot;
   restrictions.skipInitialSubtree = opt_restrictions.skipInitialSubtree;
+  restrictions.skipInitialAncestry = opt_restrictions.skipInitialAncestry;
 
   restrictions.visit = function(node) {
     if (pred(node) && !AutomationPredicate.shouldIgnoreLeaf(node))
       return true;
     if (AutomationPredicate.container(node))
       return true;
   };
 
   var walker = new AutomationTreeWalker(cur, dir, restrictions);
   return walker.next().node;
@@ skipping 159 matching lines @@
  * @return {boolean}
  */
 AutomationUtil.isDescendantOf = function(node, ancestor) {
   var testNode = node;
   while (testNode && testNode !== ancestor)
     testNode = testNode.parent;
   return testNode === ancestor;
 };
 
 });  // goog.scope