Makes workspace 2 show an alternate background (system background)

ash/wm/window_animations.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_WINDOW_ANIMATIONS_H_
 #define ASH_WM_WINDOW_ANIMATIONS_H_
 
 #include "ash/ash_export.h"
 
 namespace aura {
@@ skipping 90 matching lines @@
   WORKSPACE_ANIMATE_DOWN,
 };
 
 // Animates the workspace visualy in or out. This is used when the workspace is
 // becoming active, and out when the workspace was active.
 ASH_EXPORT void AnimateWorkspaceIn(aura::Window* window,
                                    WorkspaceAnimationDirection direction);
 ASH_EXPORT void AnimateWorkspaceOut(aura::Window* window,
                                     WorkspaceAnimationDirection direction);
 
+// Returns the amount of time before destroying the system background.
+ASH_EXPORT base::TimeDelta GetSystemBackgroundDestroyDuration();
+
 namespace internal {
 
 // Returns the duration of the cross-fade animation based on the |old_bounds|
 // and |new_bounds| of the window.
 ASH_EXPORT base::TimeDelta GetCrossFadeDuration(const gfx::Rect& old_bounds,
                                                 const gfx::Rect& new_bounds);
 
 // Returns false if the |window| didn't animate.
 ASH_EXPORT bool AnimateOnChildWindowVisibilityChanged(
     aura::Window* window, bool visible);
 
 // Delay the old layer deletion so that test can verify the behavior of
 // old layer.
 ASH_EXPORT void SetDelayedOldLayerDeletionInCrossFadeForTest(bool value);
 
 }  // namespace internal
 }  // namespace ash
 
 
 #endif  // ASH_WM_WINDOW_ANIMATIONS_H_