ChromeOS: user whitelist check should happen before entering password.

chrome/browser/chromeos/login/app_launch_signin_screen.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_APP_LAUNCH_SIGNIN_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_APP_LAUNCH_SIGNIN_SCREEN_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 61 matching lines @@
                                         const std::string& password);
   const user_manager::UserList& GetUsers() const override;
   bool IsShowGuest() const override;
   bool IsShowUsers() const override;
   bool IsSigninInProgress() const override;
   bool IsUserSigninCompleted() const override;
   void SetDisplayEmail(const std::string& email) override;
   void Signout() override;
   void HandleGetUsers() override;
   void CheckUserStatus(const std::string& user_id) override;
+  bool IsUserWhitelisted(const std::string& user_id) override;
 
   // AuthStatusConsumer implementation:
   void OnAuthFailure(const AuthFailure& error) override;
   void OnAuthSuccess(const UserContext& user_context) override;
 
   OobeUI* oobe_ui_;
   Delegate* delegate_;
   LoginDisplayWebUIHandler* webui_handler_;
   scoped_refptr<Authenticator> authenticator_;
 
   // This list should have at most one user, and that user should be the owner.
   user_manager::UserList owner_user_list_;
 
   static user_manager::UserManager* test_user_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(AppLaunchSigninScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_APP_LAUNCH_SIGNIN_SCREEN_H_