Add ContextMenuSourceType to views::ContextMenuController::ShowContextMenuForView.

ui/views/controls/button/custom_button.h

Index: ui/views/controls/button/custom_button.h
diff --git a/ui/views/controls/button/custom_button.h b/ui/views/controls/button/custom_button.h
index 71345021f2e3db03a577921e4a022e4eaf83b38d..f19db62117574c6acb90277b3fb0af48925c498a 100644
--- a/ui/views/controls/button/custom_button.h
+++ b/ui/views/controls/button/custom_button.h
@@ -84,7 +84,7 @@ class VIEWS_EXPORT CustomButton : public Button,
   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
   virtual bool AcceleratorPressed(const ui::Accelerator& accelerator) OVERRIDE;
   virtual void ShowContextMenu(const gfx::Point& p,
-                               bool is_mouse_gesture) OVERRIDE;
+                               ui::ContextMenuSourceType source_type) OVERRIDE;
   virtual void OnDragDone() OVERRIDE;
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
   virtual void VisibilityChanged(View* starting_from, bool is_visible) OVERRIDE;