Browser plugin: Implement titleChanged event.

chrome/test/data/extensions/platform_apps/web_view/main.js

 // Copyright (c) 2012 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.
 
 var util = {};
 
 // Creates a <webview> tag in document.body and returns the reference to it.
 // It also sets a dummy src. The dummy src is significant because this makes
 // sure that the <object> shim is created (asynchronously at this point) for the
 // <webview> tag. This makes the <webview> tag ready for add/removeEventListener
@@ skipping 82 matching lines @@
 
     function webViewEventListeners() {
       var webview = document.createElement('webview');
       webview.setAttribute('src', 'data:text/html,webview check api');
       document.body.appendChild(webview);
 
       var validEvents = [
         'exit',
         'loadabort',
         'loadredirect',
+        'loadcommit',
         'loadstart',
-        'loadstop'
+        'loadstop',
+        'titlechange'
       ];
       var invalidEvents = [
         'makemesandwich',
         'sudomakemesandwich'
       ];
 
       // Timeout is necessary to give the mutation observers of the webview tag
       // shim a chance to fire.
       setTimeout(function() {
         for (var i = 0; i < validEvents.length; ++i) {
@@ skipping 279 matching lines @@
         // The test starts from here, by setting the src to |url|. Event
         // listener registration works because we already have a (dummy) src set
         // on the <webview> tag.
         webview.addEventListener('loadcommit', onLoadCommitA);
         webview.addEventListener('loadcommit', onLoadCommitB);
         webview.setAttribute('src', url);
       }, 0);
     }
   ]);
 };