Add simple mash context menu support.

ash/mus/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_MUS_CONTEXT_MENU_MUS_H_
+#define ASH_MUS_CONTEXT_MENU_MUS_H_
+
+#include "ash/shelf/shelf_alignment_menu.h"
+#include "ash/shelf/shelf_item_types.h"
+#include "base/macros.h"
+#include "mash/shelf/public/interfaces/context_menu.mojom.h"
+#include "ui/base/models/simple_menu_model.h"
+
+namespace mojo {
+class Connector;
+}
+
+namespace ash {
+
+class Shelf;
+
+namespace sysui {

[sky, 2016/03/18 20:30:57]

This shouldn't be in the sysui namespace (namespace is based on directory). I
would leave it in ash namespace only.

[msw, 2016/03/18 22:10:30]

Done.

+
+// Context menu for mash; some items are populated from a connection to Chrome.
+class ContextMenuMus : public ui::SimpleMenuModel,
+                       public ui::SimpleMenuModel::Delegate {
+ public:
+  ContextMenuMus(ContextMenuMus* root_menu,
+                 Shelf* shelf,
+                 const ShelfItem* item);
+  ~ContextMenuMus() override;
+
+  // Initialize the root menu; connect to Chrome to obtain menu items, etc.
+  void InitializeRootMenu(mojo::Connector* connector);
+
+ private:
+  enum MenuItem {
+    MENU_AUTO_HIDE,
+    MENU_ALIGNMENT_MENU,
+    MENU_CHANGE_WALLPAPER,
+  };
+
+  void GetItemsAndInfoCallback(
+      mojo::Array<mash::shelf::mojom::ContextMenuItemPtr> items,
+      bool can_user_modify_shelf_auto_hide_behavior,
+      bool is_guest_session);
+
+  void AddItems(mojo::Array<mash::shelf::mojom::ContextMenuItemPtr> items);
+
+  // ui::SimpleMenuModel::Delegate overrides:
+  bool IsCommandIdChecked(int command_id) const override;
+  bool IsCommandIdEnabled(int command_id) const override;
+  bool GetAcceleratorForCommandId(int command_id,
+                                  ui::Accelerator* accelerator) override;
+  void ExecuteCommand(int command_id, int event_flags) override;
+
+  // The root menu owns a connection to Chrome that is also used by sub-menus.
+  ContextMenuMus* root_menu_;
+  mash::shelf::mojom::ContextMenuPtr context_menu_;
+
+  Shelf* shelf_;
+  const ShelfItem* item_;
+
+  ShelfAlignmentMenu alignment_menu_;
+
+  // Cached properties and submenus for menu items supplied by Chrome.
+  std::map<int, bool> item_enabled_;
+  std::map<int, bool> item_checked_;
+  std::map<int, scoped_ptr<ContextMenuMus>> item_submenu_;
+
+  DISALLOW_COPY_AND_ASSIGN(ContextMenuMus);
+};
+
+}  // namespace sysui
+}  // namespace ash
+
+#endif  // ASH_MUS_CONTEXT_MENU_MUS_H_