Add simple mash context menu support.

ash/shelf/shelf_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 ASH_SHELF_SHELF_VIEW_H_
 #define ASH_SHELF_SHELF_VIEW_H_
 
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 256 matching lines @@
                                Pointer pointer,
                                bool canceled) override;
   void MouseMovedOverButton(views::View* view) override;
   void MouseEnteredButton(views::View* view) override;
   void MouseExitedButton(views::View* view) override;
   base::string16 GetAccessibleName(const views::View* view) override;
 
   // Overridden from views::ButtonListener:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
-  // Show the list of all running items for this |item|. It will return true
-  // when the menu was shown and false if there were no possible items to
-  // choose from. |source| specifies the view which is responsible for showing
-  // the menu, and the bubble will point towards it.
+  // Show a list of all running items for this shelf |item|; it only shows a
+  // menu if there are multiple running items. |source| specifies the view
+  // responsible for showing the menu, and the bubble will point towards it.
   // The |event_flags| are the flags of the event which triggered this menu.
-  bool ShowListMenuForView(const ShelfItem& item,
+  void ShowListMenuForView(const ShelfItem& item,
                            views::View* source,
                            const ui::Event& event);
 
   // Overridden from views::ContextMenuController:
   void ShowContextMenuForView(views::View* source,
                               const gfx::Point& point,
                               ui::MenuSourceType source_type) override;
 
   // Show either a context or normal click menu of given |menu_model|.
   // If |context_menu| is set, the displayed menu is a context menu and not
@@ skipping 66 matching lines @@
   gfx::Point drag_origin_;
 
   // Index |drag_view_| was initially at.
   int start_drag_index_;
 
   // Used for the context menu of a particular item.
   ShelfID context_menu_id_;
 
   scoped_ptr<views::FocusSearch> focus_search_;
 
-  scoped_ptr<ui::MenuModel> context_menu_model_;
-
   scoped_ptr<views::MenuRunner> launcher_menu_runner_;
 
   base::ObserverList<ShelfIconObserver> observers_;
 
   // Amount content is inset on the left edge (or top edge for vertical
   // alignment).
   int leading_inset_;
 
   ShelfGestureHandler gesture_handler_;
 
@@ skipping 64 matching lines @@
 
   // Tracks UMA metrics based on shelf button press actions.
   ShelfButtonPressedMetricTracker shelf_button_pressed_metric_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_VIEW_H_