Add ContextMenuSourceType to views::ContextMenuController::ShowContextMenuForView.

ui/views/controls/scrollbar/base_scroll_bar.h

Index: ui/views/controls/scrollbar/base_scroll_bar.h
diff --git a/ui/views/controls/scrollbar/base_scroll_bar.h b/ui/views/controls/scrollbar/base_scroll_bar.h
index a62c3d840927cd92e5fc437743a22ea2bc5aa5b5..6ebe3bbafe13a789a0147c667a8484ca6151e20b 100644
--- a/ui/views/controls/scrollbar/base_scroll_bar.h
+++ b/ui/views/controls/scrollbar/base_scroll_bar.h
@@ -88,8 +88,10 @@ class VIEWS_EXPORT BaseScrollBar : public ScrollBar,
   virtual bool OnScroll(float dx, float dy) OVERRIDE;
 
   // ContextMenuController overrides:
-  virtual void ShowContextMenuForView(View* source,
-                                      const gfx::Point& point) OVERRIDE;
+  virtual void ShowContextMenuForView(
+      View* source,
+      const gfx::Point& point,
+      ui::ContextMenuSourceType source_type) OVERRIDE;
 
   // Menu::Delegate overrides:
   virtual string16 GetLabel(int id) const OVERRIDE;