Make power button controller restore to original transformation on the layer.

ash/wm/power_button_controller.h

Index: ash/wm/power_button_controller.h
diff --git a/ash/wm/power_button_controller.h b/ash/wm/power_button_controller.h
index 9b069b536d92253896dc22e3feef07793c6380b4..1d5e66ed569a2f068cb09a0657c06c3f62c3a062 100644
--- a/ash/wm/power_button_controller.h
+++ b/ash/wm/power_button_controller.h
@@ -6,12 +6,15 @@
 #define ASH_WM_POWER_BUTTON_CONTROLLER_H_
 #pragma once
 
+#include <map>
+
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
 #include "base/timer.h"
 #include "ui/aura/root_window_observer.h"
+#include "ui/aura/window.h"
 
 namespace gfx {
 class Size;
@@ -19,6 +22,7 @@ class Size;
 
 namespace ui {
 class Layer;
+class Transform;
 }
 
 namespace ash {
@@ -152,6 +156,10 @@ class ASH_EXPORT PowerButtonController : public aura::RootWindowObserver {
   // aura::RootWindowObserver overrides:
   virtual void OnRootWindowResized(const gfx::Size& new_size) OVERRIDE;
 
+  // Fills |containers| with the containers described by |group|.
+  void GetContainers(ContainerGroup group,
+                     aura::Window::Windows* containers);
+
  private:
   // Requests that the screen be locked and starts |lock_fail_timer_|.
   void OnLockTimeout();
@@ -177,6 +185,12 @@ class ASH_EXPORT PowerButtonController : public aura::RootWindowObserver {
   void ShowBackgroundLayer();
   void HideBackgroundLayer();
 
+  // Apply animation |type| to all containers described by |group|.
+  void StartAnimation(ContainerGroup group, AnimationType type);
+
+  // Retrieve original transform for |window| stored before animation started.
+  ui::Transform RetrieveOriginalTransform(aura::Window* window);
+
   scoped_ptr<PowerButtonControllerDelegate> delegate_;
 
   // True if a non-guest user is currently logged in.
@@ -235,6 +249,10 @@ class ASH_EXPORT PowerButtonController : public aura::RootWindowObserver {
   // screen.
   base::OneShotTimer<PowerButtonController> hide_background_layer_timer_;
 
+  // Map from containers to their original layer transforms before animation.
+  typedef std::map<aura::Window*, ui::Transform> WindowTransformsMap;
+  WindowTransformsMap container_transforms_;
+
   DISALLOW_COPY_AND_ASSIGN(PowerButtonController);
 };