kiosk: Do update check during launch.

chrome/browser/chromeos/app_mode/startup_app_launcher.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_APP_MODE_STARTUP_APP_LAUNCHER_H_
 #define CHROME_BROWSER_CHROMEOS_APP_MODE_STARTUP_APP_LAUNCHER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 56 matching lines @@
   void LaunchApp();
 
  private:
   // OAuth parameters from /home/chronos/kiosk_auth file.
   struct KioskOAuthParams {
     std::string refresh_token;
     std::string client_id;
     std::string client_secret;
   };
 
+  // A class to check if the app has an update. It invokes BeginInstall
+  // if the app is not installed or not up-to-date. Otherwise, it invokes
+  // OnReadyToLaunch.
+  class AppUpdateChecker;
+
   void OnLaunchSuccess();
   void OnLaunchFailure(KioskAppLaunchError::Error error);
 
+  void MaybeInstall();
+
+  // Callbacks from AppUpdateChecker
+  void OnUpdateCheckNotInstalled();
+  void OnUpdateCheckUpdateAvailable();
+  void OnUpdateCheckNoUpdate();
+
   void BeginInstall();
   void InstallCallback(bool success, const std::string& error);
   void OnReadyToLaunch();
+  void UpdateAppData();
 
   void InitializeTokenService();
   void InitializeNetwork();
 
   void StartLoadingOAuthFile();
   static void LoadOAuthFileOnBlockingPool(KioskOAuthParams* auth_params);
   void OnOAuthFileLoaded(KioskOAuthParams* auth_params);
 
   // OAuth2TokenService::Observer overrides.
   virtual void OnRefreshTokenAvailable(const std::string& account_id) OVERRIDE;
   virtual void OnRefreshTokensLoaded() OVERRIDE;
 
   Profile* profile_;
   const std::string app_id_;
   Delegate* delegate_;
   bool install_attempted_;
   bool ready_to_launch_;
 
   scoped_refptr<extensions::WebstoreStandaloneInstaller> installer_;
   KioskOAuthParams auth_params_;
 
+  scoped_ptr<AppUpdateChecker> update_checker_;
+
   DISALLOW_COPY_AND_ASSIGN(StartupAppLauncher);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_APP_MODE_STARTUP_APP_LAUNCHER_H_