kiosk: Do update check during launch.

chrome/browser/chromeos/app_mode/startup_app_launcher.h

Index: chrome/browser/chromeos/app_mode/startup_app_launcher.h
diff --git a/chrome/browser/chromeos/app_mode/startup_app_launcher.h b/chrome/browser/chromeos/app_mode/startup_app_launcher.h
index 43f7cbf0c910b02714d66ee9daad0a903364fd8b..72a45979f55c17f93af3dcbd8498ff116369d2a9 100644
--- a/chrome/browser/chromeos/app_mode/startup_app_launcher.h
+++ b/chrome/browser/chromeos/app_mode/startup_app_launcher.h
@@ -74,12 +74,25 @@ class StartupAppLauncher
     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();
@@ -101,6 +114,8 @@ class StartupAppLauncher
   scoped_refptr<extensions::WebstoreStandaloneInstaller> installer_;
   KioskOAuthParams auth_params_;
 
+  scoped_ptr<AppUpdateChecker> update_checker_;
+
   DISALLOW_COPY_AND_ASSIGN(StartupAppLauncher);
 };