Fixes bug where launcher background would remain painted when it

ash/launcher/launcher.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_LAUNCHER_H_
 #define ASH_LAUNCHER_LAUNCHER_H_
 
 #include "ash/ash_export.h"
 #include "ash/launcher/background_animator.h"
 #include "ash/launcher/launcher_types.h"
@@ skipping 38 matching lines @@
   internal::FocusCycler* GetFocusCycler();
 
   void SetAlignment(ShelfAlignment alignment);
   ShelfAlignment alignment() const { return alignment_; }
 
   // Sets whether the launcher paints a background. Default is false, but is set
   // to true if a window overlaps the shelf.
   void SetPaintsBackground(
       bool value,
       internal::BackgroundAnimator::ChangeType change_type);
+  bool paints_background() const {
+    return background_animator_.paints_background();
+  }
 
   // Sets the size of the status area.
   void SetStatusSize(const gfx::Size& size);
   const gfx::Size& status_size() const { return status_size_; }
 
   // Returns the screen bounds of the item for the specified window. If there is
   // no item for the specified window an empty rect is returned.
   gfx::Rect GetScreenBoundsOfItemIconForWindow(aura::Window* window);
 
   // Activates the the launcher item specified by the index in the list
@@ skipping 54 matching lines @@
 
   // Used to animate the background.
   internal::BackgroundAnimator background_animator_;
 
   DISALLOW_COPY_AND_ASSIGN(Launcher);
 };
 
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_H_