Chrome OS multi-profiles backend and UI.

chrome/browser/resources/chromeos/login/header_bar.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 Login UI header bar implementation.
  */
 
 cr.define('login', function() {
   /**
@@ skipping 161 matching lines @@
      * @private
      */
     updateUI_: function() {
       var gaiaIsActive = (this.signinUIState_ == SIGNIN_UI_STATE.GAIA_SIGNIN);
       var accountPickerIsActive =
           (this.signinUIState_ == SIGNIN_UI_STATE.ACCOUNT_PICKER);
       var managedUserCreationDialogIsActive =
           (this.signinUIState_ == SIGNIN_UI_STATE.MANAGED_USER_CREATION_FLOW);
       var wrongHWIDWarningIsActive =
           (this.signinUIState_ == SIGNIN_UI_STATE.WRONG_HWID_WARNING);
+      var isMultiProfilesUI = Oobe.getInstance().isSignInToAddScreen();
 
-      $('add-user-button').hidden = !accountPickerIsActive;
+      $('add-user-button').hidden = !accountPickerIsActive || isMultiProfilesUI;
       $('cancel-add-user-button').hidden = accountPickerIsActive ||
           !this.allowCancel_ ||
-          wrongHWIDWarningIsActive;
+          wrongHWIDWarningIsActive ||
+          isMultiProfilesUI;
       $('guest-user-header-bar-item').hidden = gaiaIsActive ||
           managedUserCreationDialogIsActive ||
           !this.showGuest_ ||
-          wrongHWIDWarningIsActive;
+          wrongHWIDWarningIsActive ||
+          isMultiProfilesUI;
       $('add-user-header-bar-item').hidden =
           $('add-user-button').hidden && $('cancel-add-user-button').hidden;
       $('apps-header-bar-item').hidden = !this.hasApps_ ||
           (!gaiaIsActive && !accountPickerIsActive);
 
       if (!$('apps-header-bar-item').hidden)
         $('show-apps-button').didShow();
     },
 
     /**
@@ skipping 19 matching lines @@
       this.classList.remove('login-header-bar-animate-fast');
       this.classList.add('login-header-bar-animate-slow');
       this.classList.remove('login-header-bar-hidden');
     },
   };
 
   return {
     HeaderBar: HeaderBar
   };
 });