Add a drop shadow to the fullscreen exit bubble on windows.

ui/views/bubble/bubble_border.h

 // Copyright (c) 2011 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 UI_VIEWS_BUBBLE_BUBBLE_BORDER_H_
 #define UI_VIEWS_BUBBLE_BUBBLE_BORDER_H_
 #pragma once
 
 #include "views/background.h"
 #include "views/border.h"
@@ skipping 97 matching lines @@
 
   // Sets a fixed offset for the arrow from the beginning of corresponding edge.
   // The arrow will still point to the same location but the bubble will shift
   // location to make that happen. Returns actuall arrow offset, in case of
   // overflow it differ from desired.
   int SetArrowOffset(int offset, const gfx::Size& contents_size);
 
   // Overridden from views::Border:
   virtual void GetInsets(gfx::Insets* insets) const;
 
+  // How many pixels the bubble border is from the edge of the images.
+  int pixels_to_border() const;
+
  private:
   struct BorderImages;
 
   // Loads images if necessary.
   static BorderImages* GetBorderImages(Shadow shadow);
 
   virtual ~BubbleBorder();
 
   // Overridden from views::Border:
   virtual void Paint(const views::View& view, gfx::Canvas* canvas) const;
@@ skipping 46 matching lines @@
 
  private:
   BubbleBorder* border_;
 
   DISALLOW_COPY_AND_ASSIGN(BubbleBackground);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_BUBBLE_BUBBLE_BORDER_H_