Improve speech contextual announcements and startCallback synchronization

chrome/browser/resources/chromeos/chromevox/cvox2/background/output_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.
 
 GEN_INCLUDE(['../../testing/assert_additions.js']);
 GEN_INCLUDE(['../../testing/chromevox_next_e2e_test_base.js']);
 
 /**
  * Gets the braille output and asserts that it matches expected values.
  * Annotations in the output that are primitive strings are ignored.
@@ skipping 82 matching lines @@
 function OutputE2ETest() {
   ChromeVoxNextE2ETest.call(this);
 }
 
 OutputE2ETest.prototype = {
   __proto__: ChromeVoxNextE2ETest.prototype,
 
   /** @override */
   setUp: function() {
     window.Dir = AutomationUtil.Dir;
+    this.forceContextualLastOutput();   
   }
 };
 
 TEST_F('OutputE2ETest', 'Links', function() {
   this.runWithLoadedTree('<a href="#">Click here</a>',
     function(root) {
       var el = root.firstChild.firstChild;
       var range = cursors.Range.fromNode(el);
       var o = new Output().withSpeechAndBraille(range, null, 'navigate');
       assertEqualsJSON({string_: 'Click here|Link', 'spans_': [
@@ skipping 371 matching lines @@
         '1 lstitm 1/2 lstbx +2',
         [{value: new Output.NodeSpan(el), start: 0, end: 12},
          {value: new Output.NodeSpan(el.parent), start: 13, end: 21}],
         o);
   });
 });
 
 SYNC_TEST_F('OutputE2ETest', 'MessageIdAndEarconValidity', function() {
   for (var key in Output.ROLE_INFO_) {
     var value = Output.ROLE_INFO_[key];
-    Msgs.getMsg(value.msgId);
-    Msgs.getMsg(value.msgId + '_brl');
-    assertFalse(/[A-Z]+/.test(value.msgId));
+    if (value.msgId) {
+      Msgs.getMsg(value.msgId);
+      Msgs.getMsg(value.msgId + '_brl');
+      assertFalse(/[A-Z]+/.test(value.msgId));
+    }
     if (value.earconId)
       assertNotNullNorUndefined(cvox.Earcon[value.earconId]);
   }
   for (var key in Output.STATE_INFO_) {
     var value = Output.STATE_INFO_[key];
     for (innerKey in value) {
       var innerValue = value[innerKey];
       Msgs.getMsg(innerValue.msgId);
       Msgs.getMsg(innerValue.msgId + '_brl');
       assertFalse(/[A-Z]+/.test(innerValue.msgId));
@@ skipping 148 matching lines @@
       <div role="row" tabindex=0 aria-label="start"></div>
       <div role="row" tabindex=0 aria-label="end"></div>
     */},
     function(root) {
       var r1 = cursors.Range.fromNode(root.firstChild);
       var r2 = cursors.Range.fromNode(root.lastChild);
       assertEquals('start|Row',
           new Output().withSpeech(r1, r2).speechOutputForTest.string_);
   });
 });