@Override
        public boolean onPreKeyEvent(CefBrowser browser, CefKeyEvent event, BoolRef is_keyboard_shortcut) {
          return myKeyboardHandler.handleBooleanReturnAnyOf(browser, handler -> {
            return handler.onPreKeyEvent(browser, event, is_keyboard_shortcut);
          });
        }
@Override
        public boolean onPreKeyEvent(CefBrowser browser, CefKeyEvent event, BoolRef is_keyboard_shortcut)