Implements frame sniffer to watch iframe loading state.

chrome/browser/resources/chromeos/login/screen_gaia_signin.js

 // Copyright (c) 2011 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.
 
 /**
  * @fileoverview Oobe signin screen implementation.
  */
 
 cr.define('login', function() {
 
@@ skipping 100 matching lines @@
     /**
      * Event handler that is invoked when HTML5 message is received.
      * @param e {object} Payload of the received HTML5 message.
      */
     onMessage_: function(e) {
       var msg = e.data;
       if (msg.method == 'completeLogin' && this.isAuthExtMessage_(e)) {
         chrome.send('completeLogin', [msg.email, msg.password] );
         this.loading = true;
       } else if (msg.method == 'loginUILoaded' && this.isAuthExtMessage_(e)) {
+        $('offline-message').update();
         this.loading = false;
       }
     },
 
     /**
      * Clears input fields and switches to input mode.
      * @param {boolean} takeFocus True to take focus.
      */
     reset: function(takeFocus) {
       // Reload and show the sign-in UI if needed.
       if (takeFocus)
         Oobe.showSigninUI();
     }
   };
 
   return {
     GaiaSigninScreen: GaiaSigninScreen
   };
 });