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

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

Index: chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_service.h
diff --git a/chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_service.h b/chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_service.h
index 11ea62d929fbdc2d6034c84b4bf49594e4bdffe8..9b95c228a6123ca77d3e54c526e48b3aefa57c9a 100644
--- a/chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_service.h
+++ b/chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_service.h
@@ -42,6 +42,9 @@ class ArcKioskAppService
   // ArcKioskAppManager::Observer overrides
   void OnArcKioskAppsChanged() override;
 
+  void MaintenanceSessionCreated();
+  void MaintenanceSessionFinished();
+
  private:
   ArcKioskAppService(Profile* profile, ArcAppListPrefs* prefs);
   ~ArcKioskAppService() override;
@@ -52,6 +55,7 @@ class ArcKioskAppService
 
   Profile* const profile_;
   ArcAppListPrefs* const prefs_;
+  bool maintenance_session_running_;
   ArcKioskAppManager* app_manager_;
   std::string app_id_;
   std::unique_ptr<ArcAppListPrefs::AppInfo> app_info_;