Add loadCommit and loadStop Event

content/test/data/browser_plugin_embedder.html

 <script type="text/javascript">
 function loadAbort(evt) {
   document.title = evt.type;
 }
 function loadStart(evt) {
   document.title = evt.url;
 }
+function loadStop(evt) {
+  document.title = "loadStop";
+}
+
+var commitIsTopLevel;
+function loadCommit(evt) {
+  document.title = "loadCommit:" + evt.url;
+  commitIsTopLevel = evt.isTopLevel;
+}
+
 var redirectOldUrl;
 var redirectNewUrl;
 function loadRedirect(event) {
   document.title = "redirected";
   if (event.isTopLevel) {
     redirectOldUrl = event.oldUrl;
     redirectNewUrl = event.newUrl;
   }
 }
 function SetSrc(src) {
@@ skipping 64 matching lines @@
     } else {
       window.document.title = 'main guest';
     }
   }
 }
   var plugin = document.getElementById('plugin');
   plugin.addEventListener('loadStart', loadStart);
   plugin.addEventListener('loadAbort', loadAbort);
   plugin.addEventListener('loadRedirect', loadRedirect);
   window.addEventListener('message', receiveMessage, false);
+  plugin.addEventListener('loadStop', loadStop);
+  plugin.addEventListener('loadCommit', loadCommit);
 </script>