Fix rtl shelf overflow bubble

ash/test/overflow_bubble_view_test_api.h

 // Copyright 2013 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.
 
 #ifndef ASH_TEST_OVERFLOW_BUBBLE_VIEW_TEST_API_
 #define ASH_TEST_OVERFLOW_BUBBLE_VIEW_TEST_API_
 
 #include "base/macros.h"
 
 namespace gfx {
 class Size;
 }
 
+namespace views {
+class BubbleFrameView;
+}
+
 namespace ash {
 class OverflowBubbleView;
 
 namespace test {
 
 class OverflowBubbleViewTestAPI {
  public:
   explicit OverflowBubbleViewTestAPI(OverflowBubbleView* bubble_view);
   ~OverflowBubbleViewTestAPI();
 
   // Returns the total width of items included in ShelfView.
   gfx::Size GetContentsSize();
 
   // Emulates scroll operations on OverflowBubble to make invisible last item
   // visible.
   void ScrollByXOffset(int x_offset);
 
+  // Returns the NonClientFrameView for the bubble.
+  views::BubbleFrameView* GetBubbleFrameView();
+
  private:
   OverflowBubbleView* bubble_view_;
 
   DISALLOW_COPY_AND_ASSIGN(OverflowBubbleViewTestAPI);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_OVERFLOW_BUBBLE_VIEW_TEST_API_