It is time.

ui/views/controls/menu/menu_host_root_view.h

-// Copyright (c) 2012 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 UI_VIEWS_CONTROLS_MENU_MENU_HOST_ROOT_VIEW_H_
-#define UI_VIEWS_CONTROLS_MENU_MENU_HOST_ROOT_VIEW_H_
-
-#include "ui/views/widget/root_view.h"
-
-namespace views {
-
-class MenuController;
-class SubmenuView;
-
-// MenuHostRootView is the RootView of the window showing the menu.
-// SubmenuView's scroll view is added as a child of MenuHostRootView.
-// MenuHostRootView forwards relevant events to the MenuController.
-//
-// As all the menu items are owned by the root menu item, care must be taken
-// such that when MenuHostRootView is deleted it doesn't delete the menu items.
-class MenuHostRootView : public internal::RootView {
- public:
-  MenuHostRootView(Widget* widget, SubmenuView* submenu);
-
-  void ClearSubmenu() { submenu_ = NULL; }
-
-  // Overridden from View:
-  virtual bool OnMousePressed(const ui::MouseEvent& event) override;
-  virtual bool OnMouseDragged(const ui::MouseEvent& event) override;
-  virtual void OnMouseReleased(const ui::MouseEvent& event) override;
-  virtual void OnMouseMoved(const ui::MouseEvent& event) override;
-  virtual bool OnMouseWheel(const ui::MouseWheelEvent& event) override;
-
- private:
-  // ui::EventProcessor:
-  virtual void OnEventProcessingFinished(ui::Event* event) override;
-
-  // Returns the MenuController for this MenuHostRootView.
-  MenuController* GetMenuController();
-
-  // Returns true if event targets EmptyMenu.
-  bool DoesEventTargetEmptyMenuItem(const ui::MouseEvent& event);
-
-  // The SubmenuView we contain.
-  SubmenuView* submenu_;
-
-  // Whether mouse dragged/released should be forwarded to the MenuController.
-  bool forward_drag_to_menu_controller_;
-
-  DISALLOW_COPY_AND_ASSIGN(MenuHostRootView);
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_CONTROLS_MENU_MENU_HOST_ROOT_VIEW_H_