Add Wallpaper option to launcher context menu

ash/launcher/launcher.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_LAUNCHER_LAUNCHER_H_
 #define ASH_LAUNCHER_LAUNCHER_H_
 
 #include "ash/ash_export.h"
 #include "ash/launcher/background_animator.h"
 #include "ash/launcher/launcher_types.h"
@@ skipping 67 matching lines @@
 
   // Cycles the window focus linearly over the current launcher items.
   void CycleWindowLinear(CycleDirection direction);
 
   void AddIconObserver(LauncherIconObserver* observer);
   void RemoveIconObserver(LauncherIconObserver* observer);
 
   // Returns true if the Launcher is showing a context menu.
   bool IsShowingMenu() const;
 
+  // Show the context menu for the Launcher.
+  void ShowContextMenu(const gfx::Point& location);
+
   bool IsShowingOverflowBubble() const;
 
   void SetVisible(bool visible) const;
 
   views::View* GetAppListButtonView() const;
 
   // Sets the bounds of the launcher widget, and the dimmer if visible.
   void SetWidgetBounds(const gfx::Rect bounds);
 
   // Only to be called for testing. Retrieves the LauncherView.
@@ skipping 35 matching lines @@
 
   // Used to animate the background.
   internal::BackgroundAnimator background_animator_;
 
   DISALLOW_COPY_AND_ASSIGN(Launcher);
 };
 
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_H_