Chrome OS multi-profiles backend and UI.

chrome/browser/resources/chromeos/login/display_manager.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 Display manager for WebUI OOBE and login.
  */
 
 // TODO(xiyuan): Find a better to share those constants.
 /** @const */ var SCREEN_OOBE_NETWORK = 'connect';
@@ skipping 454 matching lines @@
     },
 
     /**
      * Returns true if Oobe UI is shown.
      */
     isOobeUI: function() {
       return !document.body.classList.contains('login-display');
     },
 
     /**
-     * Returns true if the current screen is the lock screen.
+     * Returns true if the current UI type is the "Sign-in to add user"
+     * (another user session is already active).
+     */
+    isSignInToAddScreen: function() {
+      return document.documentElement.getAttribute('screen') ==
+          'login-add-user';
+    },
+
+    /**
+     * Returns true if the current UI type is the lock screen.
      */
     isLockScreen: function() {
       return document.documentElement.getAttribute('screen') == 'lock';
     },
 
     /**
      * Returns true if sign in UI should trigger wallpaper load on boot.
      */
     shouldLoadWallpaperOnBoot: function() {
       return loadTimeData.getString('bootIntoWallpaper') == 'on';
@@ skipping 181 matching lines @@
    */
   DisplayManager.clearUserPodPassword = function() {
     $('pod-row').clearFocusedPod();
   };
 
   // Export
   return {
     DisplayManager: DisplayManager
   };
 });