Add ContextMenuSourceType to views::ContextMenuController::ShowContextMenuForView.

ash/desktop_background/desktop_background_view.h

Index: ash/desktop_background/desktop_background_view.h
diff --git a/ash/desktop_background/desktop_background_view.h b/ash/desktop_background/desktop_background_view.h
index 8528e7714d6a1abe9b880f3f9d2376a25e9a7dc0..845b3512668f9b4e16a3dca4a9e302815de7db68 100644
--- a/ash/desktop_background/desktop_background_view.h
+++ b/ash/desktop_background/desktop_background_view.h
@@ -24,8 +24,10 @@ class DesktopBackgroundView : public views::View,
   virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE;
 
   // Overridden from views::ContextMenuController:
-  virtual void ShowContextMenuForView(views::View* source,
-                                      const gfx::Point& point) OVERRIDE;
+  virtual void ShowContextMenuForView(
+      views::View* source,
+      const gfx::Point& point,
+      ui::ContextMenuSourceType source_type) OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopBackgroundView);
 };