mash: Port mojo:ash_sysui's ContextMenuMus to mojo:ash.

ash/sysui/context_menu_mus.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 ASH_SYSUI_CONTEXT_MENU_MUS_H_
-#define ASH_SYSUI_CONTEXT_MENU_MUS_H_
-
-#include "ash/common/shelf/shelf_alignment_menu.h"
-#include "base/macros.h"
-#include "ui/base/models/simple_menu_model.h"
-
-namespace ash {
-
-class WmShelf;
-
-// Context menu for mash.
-// TODO(msw): Mimic logic in LauncherContextMenu.
-class ContextMenuMus : public ui::SimpleMenuModel,
-                       public ui::SimpleMenuModel::Delegate {
- public:
-  explicit ContextMenuMus(WmShelf* wm_shelf);
-  ~ContextMenuMus() override;
-
-  // ui::SimpleMenuModel::Delegate overrides:
-  bool IsCommandIdChecked(int command_id) const override;
-  bool IsCommandIdEnabled(int command_id) const override;
-  void ExecuteCommand(int command_id, int event_flags) override;
-
- private:
-  enum MenuItem {
-    MENU_AUTO_HIDE,
-    MENU_ALIGNMENT_MENU,
-    MENU_CHANGE_WALLPAPER,
-  };
-
-  WmShelf* wm_shelf_;
-  ShelfAlignmentMenu alignment_menu_;
-
-  DISALLOW_COPY_AND_ASSIGN(ContextMenuMus);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSUI_CONTEXT_MENU_MUS_H_