ash: Fix blurry app list bubble border.

ui/views/bubble/bubble_border_2.h

 // Copyright (c) 2012 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_2_H_
 #define UI_VIEWS_BUBBLE_BUBBLE_BORDER_2_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/gfx/shadow_value.h"
@@ skipping 32 matching lines @@
 
   void set_arrow_width(int arrow_width) { arrow_width_ = arrow_width; }
   int arrow_width() const { return arrow_width_; }
 
   void SetShadow(gfx::ShadowValue shadow);
 
   // views::BubbleBorder overrides:
   virtual int GetBorderThickness() const OVERRIDE;
 
  protected:
-  void PaintBackground(gfx::Canvas* canvas,
-                       const gfx::Rect& bounds) const;
+  virtual void PaintBackground(gfx::Canvas* canvas,
+                               const gfx::Rect& bounds) const;
 
  private:
   // Gets arrow offset based on arrow location and |offset_|.
   int GetArrowOffset() const;
 
   // views::BubbleBorder overrides:
   virtual void GetInsets(gfx::Insets* insets) const OVERRIDE;
   virtual gfx::Rect GetBounds(const gfx::Rect& position_relative_to,
                               const gfx::Size& contents_size) const OVERRIDE;
   virtual void GetInsetsForArrowLocation(
@@ skipping 17 matching lines @@
   gfx::Point offset_;
 
   gfx::ShadowValues shadows_;
 
   DISALLOW_COPY_AND_ASSIGN(BubbleBorder2);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_BUBBLE_BUBBLE_BORDER_2_H_