Added login screen mode for adding users into session.

chrome/browser/chromeos/app_mode/kiosk_app_launcher.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/chromeos/app_mode/kiosk_app_launcher.h"
 
 #include "base/chromeos/chromeos_version.h"
 #include "base/logging.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
@@ skipping 237 matching lines @@
 
   LOG(ERROR) << "Failed to remove app cryptohome, erro=" << return_code;
   ReportLaunchResult(KioskAppLaunchError::UNABLE_TO_REMOVE);
 }
 
 void KioskAppLauncher::OnProfilePrepared(Profile* profile) {
   // StartupAppLauncher deletes itself when done.
   (new chromeos::StartupAppLauncher(profile, app_id_))->Start();
 
   if (LoginDisplayHostImpl::default_host())
-    LoginDisplayHostImpl::default_host()->OnSessionStart();
+    LoginDisplayHostImpl::default_host()->Finalize();
   UserManager::Get()->SessionStarted();
 
   ReportLaunchResult(KioskAppLaunchError::NONE);
 }
 
 }  // namespace chromeos