Implement auto-login for ARC kiosk.

chrome/browser/chromeos/login/ui/webui_login_display.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_UI_WEBUI_LOGIN_DISPLAY_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_UI_WEBUI_LOGIN_DISPLAY_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 47 matching lines @@
   void ResyncUserData() override;
   void MigrateUserData(const std::string& old_password) override;
 
   void Login(const UserContext& user_context,
              const SigninSpecifics& specifics) override;
   bool IsSigninInProgress() const override;
   void Signout() override;
   void CompleteLogin(const UserContext& user_context) override;
 
   void OnSigninScreenReady() override;
+  void OnGaiaScreenReady() override;
   void CancelUserAdding() override;
   void LoadWallpaper(const AccountId& account_id) override;
   void LoadSigninWallpaper() override;
   void ShowEnterpriseEnrollmentScreen() override;
   void ShowEnableDebuggingScreen() override;
   void ShowKioskEnableScreen() override;
   void ShowKioskAutolaunchScreen() override;
   void ShowWrongHWIDScreen() override;
   void SetWebUIHandler(LoginDisplayWebUIHandler* webui_handler) override;
   virtual void ShowSigninScreenForCreds(const std::string& username,
@@ skipping 33 matching lines @@
 
   // Reference to the WebUI handling layer for the login screen
   LoginDisplayWebUIHandler* webui_handler_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(WebUILoginDisplay);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UI_WEBUI_LOGIN_DISPLAY_H_