Merge dom node and node unit types.

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

 // 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.
 
 // Include test fixture.
 GEN_INCLUDE(['../../testing/chromevox_next_e2e_test_base.js']);
 
 GEN_INCLUDE(['../../testing/snippets.js']);
 
 /**
@@ skipping 105 matching lines @@
   }.bind(this));
 });
 
 TEST_F('AutomationUtilE2ETest', 'GetDirection', function() {
   this.runWithLoadedTree(this.basicDoc, function(root) {
     var left = root, right = root;
 
     // Same node.
     assertEquals(Dir.FORWARD, AutomationUtil.getDirection(left, right));
 
-    // Ancestor.
+    // Ancestry.
     left = left.firstChild;
-    assertEquals(Dir.FORWARD, AutomationUtil.getDirection(left, right));
+    // Upward movement is backward (in dfs).
+    assertEquals(Dir.BACKWARD, AutomationUtil.getDirection(left, right));
+    // Downward movement is forward.
     assertEquals(Dir.FORWARD, AutomationUtil.getDirection(right, left));
 
     // Ordered.
     right = right.lastChild;
     assertEquals(Dir.BACKWARD, AutomationUtil.getDirection(right, left));
     assertEquals(Dir.FORWARD, AutomationUtil.getDirection(left, right));
   });
 });
 
 TEST_F('AutomationUtilE2ETest', 'IsInSameWebpage', function() {
@@ skipping 85 matching lines @@
     assertEquals(h1, AutomationUtil.hitTest(r, getCP(h1.parent)));
     assertEquals(h1.parent.parent,
                  AutomationUtil.hitTest(r, getCP(h1.parent.parent)));
 
     assertEquals(a, AutomationUtil.hitTest(r, getCP(a)));
     assertEquals(a, AutomationUtil.hitTest(r, getCP(a.parent)));
     assertEquals(a.parent.parent,
                  AutomationUtil.hitTest(r, getCP(a.parent.parent)));
   });
 });