Fixes bug where launcher background would remain painted when it

ash/launcher/background_animator.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 ASH_LAUNCHER_BACKGROUND_ANIMATOR_H_
 #define ASH_LAUNCHER_BACKGROUND_ANIMATOR_H_
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "ui/base/animation/animation_delegate.h"
@@ skipping 23 matching lines @@
 
   BackgroundAnimator(BackgroundAnimatorDelegate* delegate,
                      int min_alpha,
                      int max_alpha);
   virtual ~BackgroundAnimator();
 
   // Sets whether a background is rendered. Initial value is false. If |type|
   // is |CHANGE_IMMEDIATE| and an animation is not in progress this notifies
   // the delegate immediately (synchronously from this method).
   void SetPaintsBackground(bool value, ChangeType type);
+  bool paints_background() const { return paints_background_; }
 
   // Current alpha.
   int alpha() const { return alpha_; }
 
   // ui::AnimationDelegate overrides:
   virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
 
  private:
   BackgroundAnimatorDelegate* delegate_;
 
   const int min_alpha_;
   const int max_alpha_;
 
   ui::SlideAnimation animation_;
 
   // Whether the background is painted.
   bool paints_background_;
 
   // Current alpha value of the background.
   int alpha_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundAnimator);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_BACKGROUND_ANIMATOR_H_