Fix bug with login-prompt-visible not being sent in some rare cases.

chrome/browser/resources/chromeos/login/screen_gaia_signin.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.
 
 /**
  * @fileoverview Oobe signin screen implementation.
  */
 
 cr.define('login', function() {
   // Gaia loading time after which portal check should be fired.
@@ skipping 273 matching lines @@
         this.loading = false;
         $('error-message').update();
         this.clearLoadingTimer_();
         // Show deferred error bubble.
         if (this.errorBubble_) {
           this.showErrorBubble(this.errorBubble_[0], this.errorBubble_[1]);
           this.errorBubble_ = undefined;
         }
         this.clearRetry_();
         chrome.send('loginWebuiReady');
-        chrome.send('loginVisible');
+        chrome.send('loginVisible', ['gaia']);
         // Warm up the user images screen.
         window.setTimeout(function() {
             Oobe.getInstance().preloadScreen({id: SCREEN_USER_IMAGE_PICKER});
         }, 0);
       } else if (msg.method == 'offlineLogin') {
         this.email = msg.email;
         chrome.send('authenticateUser', [msg.email, msg.password]);
         this.loading = true;
         Oobe.getInstance().headerHidden = true;
       }
@@ skipping 125 matching lines @@
    * @param {Object} data New extension parameters bag.
    */
   GaiaSigninScreen.updateAuthExtension = function(data) {
     $('gaia-signin').updateAuthExtension_(data);
   };
 
   return {
     GaiaSigninScreen: GaiaSigninScreen
   };
 });