mash: Cleanup ash shelf application menu code.

ash/public/cpp/shelf_application_menu_item.h

+// Copyright 2017 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_PUBLIC_CPP_SHELF_APPLICATION_MENU_ITEM_H_
+#define ASH_PUBLIC_CPP_SHELF_APPLICATION_MENU_ITEM_H_
+
+#include <memory>
+#include <vector>
+
+#include "ash/public/cpp/ash_public_export.h"
+#include "base/macros.h"
+#include "base/strings/string16.h"
+#include "ui/gfx/image/image.h"
+
+namespace ash {
+
+// The title, icon, and execute function for shelf application menu items.
+class ASH_PUBLIC_EXPORT ShelfApplicationMenuItem {
+ public:
+  // Creates an item with a |title| and optional |icon| (pass nullptr for none).
+  explicit ShelfApplicationMenuItem(const base::string16 title,
+                                    const gfx::Image* icon = nullptr);
+  virtual ~ShelfApplicationMenuItem();
+
+  // The title and icon for this menu item.
+  const base::string16& title() const { return title_; }
+  const gfx::Image& icon() const { return icon_; }
+
+  // Executes the menu item; |event_flags| can be used to check additional
+  // keyboard modifiers from the event that issued this command.
+  virtual void Execute(int event_flags);
+
+ private:
+  const base::string16 title_;
+  const gfx::Image icon_;
+
+  DISALLOW_COPY_AND_ASSIGN(ShelfApplicationMenuItem);
+};
+
+using ShelfAppMenuItemList =
+    std::vector<std::unique_ptr<ShelfApplicationMenuItem>>;
+
+}  // namespace ash
+
+#endif  // ASH_PUBLIC_CPP_SHELF_APPLICATION_MENU_ITEM_H_