+#if defined(OS_CHROMEOS)
+ // Called just after a app window was hidden. This is different from
+ // window visibility as a minimize does not hide a window, but does make
+ // it not visible.
+ virtual void OnAppWindowHidden(apps::AppWindow* app_window);
+ // Called just after a app window was shown.
+ virtual void OnAppWindowShown(apps::AppWindow* app_window);
+#endif