ChromeOS: user whitelist check should happen before entering password.

chrome/browser/chromeos/login/lock/webui_screen_locker.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_WEBUI_SCREEN_LOCKER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_WEBUI_SCREEN_LOCKER_H_
 
 #include <string>
 
 #include "ash/shell_delegate.h"
@@ skipping 74 matching lines @@
   void OnSigninScreenReady() override;
   void OnStartEnterpriseEnrollment() override;
   void OnStartEnableDebuggingScreen() override;
   void OnStartKioskEnableScreen() override;
   void OnStartKioskAutolaunchScreen() override;
   void ShowWrongHWIDScreen() override;
   void ResetPublicSessionAutoLoginTimer() override;
   void ResyncUserData() override;
   void SetDisplayEmail(const std::string& email) override;
   void Signout() override;
+  bool IsUserWhitelisted(const std::string& user_id) override;
 
   // LockWindow::Observer:
   void OnLockWindowReady() override;
 
   // LockStateObserver:
   void OnLockStateEvent(ash::LockStateObserver::EventType event) override;
 
   // WidgetObserver:
   void OnWidgetDestroying(views::Widget* widget) override;
 
@@ skipping 55 matching lines @@
   bool is_observing_keyboard_;
 
   base::WeakPtrFactory<WebUIScreenLocker> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebUIScreenLocker);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_WEBUI_SCREEN_LOCKER_H_