Implements frame sniffer to watch iframe loading state.

chrome/browser/resources/chromeos/login/oobe.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 Out of the box experience flow (OOBE).
  * This is the main code for the OOBE WebUI implementation.
  */
 
 var localStrings = new LocalStrings();
@@ skipping 207 matching lines @@
         this.appendButtons_(screen.buttons);
       }
     },
 
     /**
      * Prepares screens to use in login display.
      */
     prepareForLoginDisplay_ : function() {
       for (var i = 0, screenId; screenId = this.screens_[i]; ++i) {
         var screen = $(screenId);
-
         screen.classList.add('faded');
         screen.classList.remove('right');
         screen.classList.remove('left');
       }
     }
   };
 
   /**
    * Setups given "select" element using the list and adds callback.
    * @param {!Element} select Select object to be updated.
@@ skipping 344 matching lines @@
 document.onselectstart = function(e) {
   e.preventDefault();
 }
 
 // Disable dragging.
 document.ondragstart = function(e) {
   e.preventDefault();
 }
 
 document.addEventListener('DOMContentLoaded', cr.ui.Oobe.initialize);