Implement the 2016Q2 Translate UI designe spec out in

ui/views/bubble/bubble_frame_view.h

Index: ui/views/bubble/bubble_frame_view.h
diff --git a/ui/views/bubble/bubble_frame_view.h b/ui/views/bubble/bubble_frame_view.h
index 6f92883c13b51247507b4d984196bac827e19c86..90f1030c7d979ae0b73220822382e63fcfc448dc 100644
--- a/ui/views/bubble/bubble_frame_view.h
+++ b/ui/views/bubble/bubble_frame_view.h
@@ -85,6 +85,8 @@ class VIEWS_EXPORT BubbleFrameView : public NonClientFrameView,
 
   bool close_button_clicked() const { return close_button_clicked_; }
 
+  LabelButton* GetCloseButtonForTest() { return close_; }
+
  protected:
   // Returns the available screen bounds if the frame were to show in |rect|.
   virtual gfx::Rect GetAvailableScreenBounds(const gfx::Rect& rect) const;