Support navigation within editable nodes.

chrome/browser/resources/chromeos/chromevox/cvox2/background/cursors_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']);
 
 /**
  * Test fixture for cvox2.cursors.
  * @constructor
@@ skipping 355 matching lines @@
 TEST_F('CursorsTest', 'MultiLineOffsetSelection', function() {
   this.runWithLoadedTree(this.multiInlineDoc, function(root) {
     var secondLine = root.firstChild.firstChild.firstChild.nextSibling;
     assertEquals('inlineTextBox', secondLine.role);
     assertEquals('diff ', secondLine.name);
 
     var secondLineCursor = new cursors.Cursor(secondLine, -1);
     // The selected node moves to the static text node.
     assertEquals(secondLineCursor.node.parent,
                  secondLineCursor.selectionNode_);
+
     // This selects the entire node via a character offset.
     assertEquals(6, secondLineCursor.selectionIndex_);
 
     // Index into the characters.
     secondLineCursor = new cursors.Cursor(secondLine, 1);
     assertEquals(7, secondLineCursor.selectionIndex_);
 
-    // Now, try selecting via node offsets.
+    // Now, try selecting via node offsets. This defaults to index 0 and not
+    // index in parent because Blink accessibility selection doesn't always
+    // work.
     var cursor = new cursors.Cursor(root.firstChild, -1);
-    assertEquals(root, cursor.selectionNode_);
+    assertEquals(root.firstChild, cursor.selectionNode_);
     assertEquals(0, cursor.selectionIndex_);
 
     cursor = new cursors.Cursor(root.firstChild.nextSibling, -1);
-    assertEquals(root, cursor.selectionNode_);
-    assertEquals(1, cursor.selectionIndex_);
+    assertEquals(root.firstChild.nextSibling, cursor.selectionNode_);
+    assertEquals(0, cursor.selectionIndex_);
   });
 });
 
 TEST_F('CursorsTest', 'InlineElementOffset', function() {
   this.runWithLoadedTree(function() {/*!
     <p>This<br> is a<a href="#g">test</a>of selection</p>
   */}, function(root) {
     root.addEventListener('textSelectionChanged', this.newCallback(function(evt) {
       // This is a little unexpected though not really incorrect; Ctrl+C works.
       assertEquals(testNode, root.anchorObject);
@@ skipping 15 matching lines @@
 
     var curIntoO = new cursors.Cursor(ofSelectionNode, 1);
     assertEquals('of selection', curIntoO.selectionNode_.name);
     assertEquals(RoleType.staticText, curIntoO.selectionNode_.role);
     assertEquals(1, curIntoO.selectionIndex_);
 
     var oRange = new cursors.Range(cur, curIntoO);
     oRange.select();
   });
 });