Add lock pod animation on unlock.

ash/wm/session_state_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_WM_SESSION_STATE_ANIMATOR_H_
 #define ASH_WM_SESSION_STATE_ANIMATOR_H_
 
 #include "ash/ash_export.h"
 #include "ash/wm/workspace/colored_window_controller.h"
 #include "base/basictypes.h"
@@ skipping 109 matching lines @@
   // Destroy |foreground_| when it is not needed anymore.
   void DropForeground();
 
   // Drops back layer after |UNDO_SLOW_CLOSE| animation delay.
   void ScheduleDropBlackLayer();
 
   // Apply animation |type| to all containers included in |container_mask|.
   void StartAnimation(int container_mask,
                       AnimationType type);
 
+  // Apply animation |type| to all containers included in |container_mask| and
+  // call a |callback| at the end of the animation, if it is not null.
+  void StartAnimation(int container_mask,

[Daniel Erat, 2012/10/25 15:45:58]

i'd suggest naming this StartAnimationWithCallback() instead
(http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#Function_Overl...)

+                      AnimationType type,
+                      base::Callback<void(void)>& callback);
+
   // Fills |containers| with the containers included in |container_mask|.
   void GetContainers(int container_mask,
                      aura::Window::Windows* containers);
 
   // aura::RootWindowObserver overrides:
   virtual void OnRootWindowResized(const aura::RootWindow* root,
                                    const gfx::Size& old_size) OVERRIDE;
 
  private:
+  // Apply animation |type| to window |window| and add |observer| if it is not
+  // NULL to the last animation sequence.
+  void RunAnimationForWindow(aura::Window* window,
+                             AnimationType type,
+                             ui::LayerAnimationObserver* observer);
+
   // Layer that's stacked under all of the root window's children to provide a
   // black background when we're scaling all of the other windows down.
   // TODO(derat): Remove this in favor of having the compositor only clear the
   // viewport when there are regions not covered by a layer:
   // http://crbug.com/113445
   scoped_ptr<ui::Layer> black_layer_;
 
   // White foreground that is used during shutdown animation to "fade
   // everything into white".
   scoped_ptr<ColoredWindowController> foreground_;
 
   // Started when we abort the pre-lock state.  When it fires, we hide
   // |black_layer_|, as the desktop background is now covering the whole
   // screen.
   base::OneShotTimer<SessionStateAnimator> hide_black_layer_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionStateAnimator);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_SESSION_STATE_ANIMATOR_H_