Allow tree walker to escape roots

chrome/browser/resources/chromeos/chromevox/cvox2/background/tree_walker_test.extjs

 // 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.
 
 // Include test fixture.
 GEN_INCLUDE(['../../testing/chromevox_next_e2e_test_base.js']);
 
 GEN_INCLUDE(['../../testing/snippets.js']);
 
 /**
@@ skipping 108 matching lines @@
       var leafP = function(n) { return n.name == '3' || n.name == '5'; };
       var rootP = function(n) { return n.name == '2'; };
 
       // Track the nodes we've visited.
       var visited = '';
       var visit = function(n) { visited += n.name; };
       var restrictions = {leaf: leafP, root: rootP, visit: visit};
       var walker = new AutomationTreeWalker(node2, 'forward', restrictions);
       while (walker.next().node) {}
       assertEquals('35', visited);
+      assertEquals(AutomationTreeWalkerPhase.OTHER, walker.phase);
 
       // And the reverse.
       // Note that walking into a root is allowed.
       visited = '';
       var node6 = r.lastChild.lastChild;
       assertEquals('6', node6.name);
       walker = new AutomationTreeWalker(node6, 'backward', restrictions);
       while (walker.next().node) {}
       assertEquals('532', visited);
 
@@ skipping 51 matching lines @@
         {root: function(node) { return node === r; }});
     assertEquals(r, backwardWalker.next().node);
     assertEquals(null, backwardWalker.next().node);
 
     var forwardWalker =
         new AutomationTreeWalker(r.firstChild.lastChild, 'forward',
             {root: function(node) { return node === r; }});
     assertEquals(null, forwardWalker.next().node);
   });
 });