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

chrome/browser/resources/chromeos/login/screen_account_picker.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 Account picker screen implementation.
  */
 
 cr.define('login', function() {
   /**
@@ skipping 82 matching lines @@
      * Event handler invoked when the page is shown and ready.
      */
     onShow: function() {
       if (!this.firstShown_) return;
       this.firstShown_ = false;
       // TODO(nkostylev): Enable animation back when session start jank
       // is reduced. See http://crosbug.com/11116 http://crosbug.com/18307
       // $('pod-row').startInitAnimation();
 
       chrome.send('accountPickerReady');
-      chrome.send('loginVisible');
+      chrome.send('loginVisible', ['pod-row']);
     },
 
      /**
       * Event handler that is invoked just before the frame is hidden.
       * @param {string} data Screen init payload.
       */
     onBeforeHide: function(data) {
       $('pod-row').handleHide();
     },
 
@@ skipping 83 matching lines @@
     };
     // Start image loading.
     // Add timestamp for wallpapers that are rotated over time.
     image.src = 'chrome://wallpaper/' + new Date().getTime();
   };
 
   return {
     AccountPickerScreen: AccountPickerScreen
   };
 });