Add Wallpaper option to launcher context menu

ash/desktop_background/desktop_background_view.cc

 // 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.
 
 #include "ash/desktop_background/desktop_background_view.h"
 
 #include <limits>
 
 #include "ash/ash_export.h"
 #include "ash/desktop_background/desktop_background_controller.h"
@@ skipping 134 matching lines @@
          (height() - wallpaper.height()) / 2);
   }
 }
 
 bool DesktopBackgroundView::OnMousePressed(const ui::MouseEvent& event) {
   return true;
 }
 
 void DesktopBackgroundView::ShowContextMenuForView(views::View* source,
                                                    const gfx::Point& point) {
-  Shell::GetInstance()->ShowBackgroundMenu(GetWidget(), point);
+  Shell::GetInstance()->ShowContextMenu(point);
 }
 
 views::Widget* CreateDesktopBackground(aura::RootWindow* root_window,
                                        int container_id) {
   DesktopBackgroundController* controller =
       ash::Shell::GetInstance()->desktop_background_controller();
   views::Widget* desktop_widget = new views::Widget;
   views::Widget::InitParams params(
       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
   if (controller->GetWallpaper().isNull())
@@ skipping 22 matching lines @@
   settings.SetPreemptionStrategy(ui::LayerAnimator::ENQUEUE_NEW_ANIMATION);
   settings.AddObserver(new ShowWallpaperAnimationObserver(root_window,
                                                           desktop_widget));
   desktop_widget->Show();
   desktop_widget->GetNativeView()->SetName("DesktopBackgroundView");
   return desktop_widget;
 }
 
 }  // namespace internal
 }  // namespace ash