Compact layout mananger animates windows rather than the default container layer.

ash/wm/compact_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_COMPACT_LAYOUT_MANAGER_H_
 #define ASH_WM_COMPACT_LAYOUT_MANAGER_H_
 #pragma once
 
 #include "ash/ash_export.h"
 #include "ash/wm/base_layout_manager.h"
@@ skipping 45 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(CompactLayoutManagerTest, CloseAllWindows);
 
   // Hides the status area if we are managing it and full screen windows are
   // visible.
   void UpdateStatusAreaVisibility();
 
   // Start a slide in / out animation sequence for the layer.
   // The underlying layer is translated to -|offset_x| position.
   void AnimateSlideTo(int offset_x);
 
+  // Returns true if there is a slide in progress.
+  bool AreWindowsAnimating() const;
+
   // Layout all browser windows currently in the window cycle list.
   // skip |skip_this_window| if we do not want the window to be laid out.
   void LayoutWindows(aura::Window* skip_this_window);
 
   // Hides all but the |current_window_| in the windows list. If we
   // cannot determine the |current_window_|, we do not hide any.
   void HideWindows();
 
   // Returns the next window after |window| in the window cycle list.
   // This could return NULL if we cannot find a next window.
   aura::Window* FindReplacementWindow(aura::Window* window);
 
   // Switches to a replacement window of |current_window_|.
   void SwitchToReplacementWindow();
 
   // Status area with clock, network, battery, etc. icons. May be NULL if the
   // shelf is managing the status area.
   views::Widget* status_area_widget_;
 
   // The browser window currently in the viewport.
   aura::Window* current_window_;
 
   DISALLOW_COPY_AND_ASSIGN(CompactLayoutManager);
 };
 
 }  // namespace ash
 }  // namespace internal
 
 #endif  // ASH_WM_COMPACT_LAYOUT_MANAGER_H_