Add ContextMenuSourceType to views::ContextMenuController::ShowContextMenuForView.

ash/shell.h

Index: ash/shell.h
diff --git a/ash/shell.h b/ash/shell.h
index a42029314a04129fe66db121bc46ada8c5f44a86..d9b6e15e0df9df6a8a302dfbc5fe6eeb1e351d5b 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -211,7 +211,8 @@ class ASH_EXPORT Shell
 
   // Shows the context menu for the background and launcher at
   // |location_in_screen| (in screen coordinates).
-  void ShowContextMenu(const gfx::Point& location_in_screen);
+  void ShowContextMenu(const gfx::Point& location_in_screen,
+                       ui::ContextMenuSourceType source_type);
 
   // Toggles the app list. |window| specifies in which display the app
   // list should be shown. If this is NULL, the active root window