mash: Port context menu code to WmShell and WmRootWindowController.

ash/common/wm_shell.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_COMMON_WM_SHELL_H_
 #define ASH_COMMON_WM_SHELL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 259 matching lines @@
   virtual void LockCursor() = 0;
   virtual void UnlockCursor() = 0;
   virtual bool IsMouseEventsEnabled() = 0;
 
   virtual std::vector<WmWindow*> GetAllRootWindows() = 0;
 
   virtual void RecordGestureAction(GestureActionType action) = 0;
   virtual void RecordUserMetricsAction(UserMetricsAction action) = 0;
   virtual void RecordTaskSwitchMetric(TaskSwitchSource source) = 0;
 
-  // Shows the context menu for the background and the shelf at
-  // |location_in_screen|.
-  virtual void ShowContextMenu(const gfx::Point& location_in_screen,
-                               ui::MenuSourceType source_type) = 0;
+  // Shows the context menu for the wallpaper or shelf at |location_in_screen|.
+  void ShowContextMenu(const gfx::Point& location_in_screen,
+                       ui::MenuSourceType source_type);
 
   // Returns a WindowResizer to handle dragging. |next_window_resizer| is
   // the next WindowResizer in the WindowResizer chain. This may return
   // |next_window_resizer|.
   virtual std::unique_ptr<WindowResizer> CreateDragWindowResizer(
       std::unique_ptr<WindowResizer> next_window_resizer,
       wm::WindowState* window_state) = 0;
 
   virtual std::unique_ptr<WindowCycleEventFilter>
   CreateWindowCycleEventFilter() = 0;
@@ skipping 168 matching lines @@
   scoped_refptr<base::SequencedWorkerPool> blocking_pool_;
 
 #if defined(OS_CHROMEOS)
   std::unique_ptr<LogoutConfirmationController> logout_confirmation_controller_;
 #endif
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_SHELL_H_