Add brightness/grayscale animations and use them for OOBE boot transition

ui/compositor/layer_animation_delegate.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 UI_COMPOSITOR_LAYER_ANIMATION_DELEGATE_H_
 #define UI_COMPOSITOR_LAYER_ANIMATION_DELEGATE_H_
 
 #include "ui/compositor/compositor_export.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/transform.h"
 
 namespace ui {
 
 // Layer animations interact with the layers using this interface.
 class COMPOSITOR_EXPORT LayerAnimationDelegate {
  public:
   virtual void SetBoundsFromAnimation(const gfx::Rect& bounds) = 0;
   virtual void SetTransformFromAnimation(const Transform& transform) = 0;
   virtual void SetOpacityFromAnimation(float opacity) = 0;
   virtual void SetVisibilityFromAnimation(bool visibility) = 0;
+  virtual void SetBrightnessFromAnimation(float brightness) = 0;
+  virtual void SetGrayscaleFromAnimation(float grayscale) = 0;
   virtual void ScheduleDrawForAnimation() = 0;
   virtual const gfx::Rect& GetBoundsForAnimation() const = 0;
   virtual const Transform& GetTransformForAnimation() const = 0;
   virtual float GetOpacityForAnimation() const = 0;
   virtual bool GetVisibilityForAnimation() const = 0;
+  virtual float GetBrightnessForAnimation() const = 0;
+  virtual float GetGrayscaleForAnimation() const = 0;
 
  protected:
   virtual ~LayerAnimationDelegate() {}
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_LAYER_ANIMATION_DELEGATE_H_