Implement inline signin with iframe

chrome/browser/resources/inline_login/inline_login.js

 // Copyright 2013 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 Inline login UI.
  */
 
 <include src="../gaia_auth_host/gaia_auth_host.js"></include>
 
@@ skipping 31 matching lines @@
 
     chrome.send('initialize');
   }
 
   /**
    * Loads auth extension.
    * @param {Object} data Parameters for auth extension.
    */
   function loadAuthExtension(data) {
     authExtHost.load(data.authMode, data, onAuthCompleted);
-    // Do not show loading spinner to give user a faster response
-    // with inline flows.
-    $('contents').classList.toggle('loading',
-        data.authMode != cr.login.GaiaAuthHost.AuthMode.INLINE);
+    $('contents').classList.toggle('loading', true);
   }
 
   /**
    * Closes the inline login dialog.
    */
   function closeDialog() {
     chrome.send('DialogClose', ['']);
   }
 
   /**
    * Invoked when failed to get oauth2 refresh token.
    */
   function handleOAuth2TokenFailure() {
     // TODO(xiyuan): Show an error UI.
     authExtHost.reload();
     $('contents').classList.toggle('loading', true);
   }
 
   return {
     initialize: initialize,
     loadAuthExtension: loadAuthExtension,
     closeDialog: closeDialog,
     handleOAuth2TokenFailure: handleOAuth2TokenFailure
   };
 });
 
 document.addEventListener('DOMContentLoaded', inline.login.initialize);