arc: Stop/start ARC++ kiosk app when maintenance session started/finished.

chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_service.h

 // Copyright 2016 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_ARC_ARC_KIOSK_APP_SERVICE_H_
 #define CHROME_BROWSER_CHROMEOS_APP_MODE_ARC_ARC_KIOSK_APP_SERVICE_H_
 
 #include "base/macros.h"
 #include "chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_launcher.h"
 #include "chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_manager.h"
@@ skipping 24 matching lines @@
   void OnAppReadyChanged(const std::string& id, bool ready) override;
   void OnTaskCreated(int32_t task_id,
                      const std::string& package_name,
                      const std::string& activity) override;
   void OnTaskDestroyed(int32_t task_id) override;
   void OnPackageListInitialRefreshed() override;
 
   // ArcKioskAppManager::Observer overrides
   void OnArcKioskAppsChanged() override;
 
+  void MaintenanceSessionCreated();
+  void MaintenanceSessionFinished();
+
  private:
   ArcKioskAppService(Profile* profile, ArcAppListPrefs* prefs);
   ~ArcKioskAppService() override;
 
   std::string GetAppId();
   // Called when app should be started or stopped.
   void PreconditionsChanged();
 
   Profile* const profile_;
   ArcAppListPrefs* const prefs_;
+  bool maintenance_session_running_;
   ArcKioskAppManager* app_manager_;
   std::string app_id_;
   std::unique_ptr<ArcAppListPrefs::AppInfo> app_info_;
   int32_t task_id_ = -1;
   std::unique_ptr<PrefChangeRegistrar> pref_change_registrar_;
   // Keeps track whether the app is already launched
   std::unique_ptr<ArcKioskAppLauncher> app_launcher_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcKioskAppService);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_APP_MODE_ARC_ARC_KIOSK_APP_SERVICE_H_