Fix child index and child count to respect role filtering.

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

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/background_test.extjs
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/background_test.extjs b/chrome/browser/resources/chromeos/chromevox/cvox2/background/background_test.extjs
index e8f8475cbda6d72897e4793e480ee88d8862eab9..964bd33c9ce1bb0366ae0ccb6074e2a8749d9ae8 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/background_test.extjs
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/background_test.extjs
@@ -870,3 +870,24 @@ TEST_F('BackgroundTest', 'ButtonNameValueDescription', function() {
         .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();
+  });
+});