Fix child index and child count to respect role filtering.

chrome/browser/resources/chromeos/chromevox/cvox2/background/background_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',
              '../../testing/assert_additions.js']);
 
 GEN_INCLUDE(['../../testing/mock_feedback.js']);
 
@@ skipping 852 matching lines @@
   this.runWithLoadedTree(function(root) {/*!
     <input type="submit" aria-label="foo" value="foo"></input>
   */}, function(root) {
     var btn = root.find({role: RoleType.button});
     mockFeedback.call(btn.focus.bind(btn))
         .expectSpeech('foo')
         .expectSpeech('Button')
         .replay();
   });
 });
+
+TEST_F('BackgroundTest', 'OptionChildIndexCount', function() {
+  var mockFeedback = this.createMockFeedback();
+  this.runWithLoadedTree(function(root) {/*!
+    <div role="listbox">
+      <p>Fruits</p>
+      <div role="option">apple</div>
+      <div role="option">banana</div>
+    </div>
+  */}, function(root) {
+    mockFeedback.call(doCmd('nextObject'))
+        .expectSpeech('Fruits')
+        .expectSpeech('with 2 items')
+        .expectSpeech('apple')
+        .expectSpeech(' 1 of 2 ')
+        .call(doCmd('nextObject'))
+        .expectSpeech('banana')
+        .expectSpeech(' 2 of 2 ')
+        .replay();
+  });
+});