Changes launcher so that when animating hidden the background doesn't

ash/wm/shelf_layout_manager.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_WM_SHELF_LAYOUT_MANAGER_H_
 #define ASH_WM_SHELF_LAYOUT_MANAGER_H_
 
 #include "ash/ash_export.h"
 #include "ash/launcher/launcher.h"
 #include "ash/shell_observer.h"
@@ skipping 155 matching lines @@
 
   // Overridden from ash::ShellObserver:
   virtual void OnLockStateChanged(bool locked) OVERRIDE;
 
   // Overriden from aura::client::ActivationChangeObserver:
   virtual void OnWindowActivated(aura::Window* active,
                                  aura::Window* old_active) OVERRIDE;
 
  private:
   class AutoHideEventFilter;
+  class UpdateShelfObserver;
   friend class ash::ScreenAsh;
   friend class ShelfLayoutManagerTest;
   FRIEND_TEST_ALL_PREFIXES(ShelfLayoutManagerTest, SetAutoHideBehavior);
 
   struct TargetBounds {
     TargetBounds();
 
     float opacity;
     gfx::Rect launcher_bounds_in_root;
     gfx::Rect status_bounds_in_root;
@@ skipping 113 matching lines @@
   };
   GestureDragStatus gesture_drag_status_;
 
   // Tracks the amount of the drag. The value is only valid when
   // |gesture_drag_status_| is set to GESTURE_DRAG_IN_PROGRESS.
   float gesture_drag_amount_;
 
   // Manage the auto-hide state during the gesture.
   AutoHideState gesture_drag_auto_hide_state_;
 
+  // Used to delay updating shelf background.
+  UpdateShelfObserver* update_shelf_observer_;
+
   DISALLOW_COPY_AND_ASSIGN(ShelfLayoutManager);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_SHELF_LAYOUT_MANAGER_H_