Added login screen mode for adding users into session.

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 487 matching lines @@
     isOobeUI: function() {
       return !document.body.classList.contains('login-display');
     },
 
     /**
      * 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';
+          'user-adding';
     },
 
     /**
      * 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';
     },
   };
 
   /**
    * Initializes display manager.
    */
   DisplayManager.initialize = function() {
+    // Extracting screen type from URL.
+    var hash = window.location.hash;
+    var screenType;
+    if (!hash) {
+      console.error('Screen type not found. Setting default value "login".');
+      screenType = 'login';
+    } else {
+      screenType = hash.substring(1);
+    }
+    document.documentElement.setAttribute('screen', screenType);
+
     var link = $('enterprise-info-hint-link');
     link.addEventListener(
         'click', DisplayManager.handleEnterpriseHintLinkClick);
   },
 
   /**
    * Returns offset (top, left) of the element.
    * @param {!Element} element HTML element.
    * @return {!Object} The offset (top, left).
    */
@@ skipping 171 matching lines @@
    */
   DisplayManager.refocusCurrentPod = function() {
     $('pod-row').refocusCurrentPod();
   };
 
   // Export
   return {
     DisplayManager: DisplayManager
   };
 });