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

ui/compositor/layer_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 UI_COMPOSITOR_LAYER_ANIMATOR_H_
 #define UI_COMPOSITOR_LAYER_ANIMATOR_H_
 
 #include <deque>
 #include <vector>
 
@@ skipping 51 matching lines @@
   gfx::Rect GetTargetBounds() const;
 
   // Sets the opacity on the delegate. May cause an implicit animation.
   virtual void SetOpacity(float opacity);
   float GetTargetOpacity() const;
 
   // Sets the visibility of the delegate. May cause an implicit animation.
   virtual void SetVisibility(bool visibility);
   bool GetTargetVisibility() const;
 
+  // Sets the brightness on the delegate. May cause an implicit animation.
+  virtual void SetBrightness(float brightness);
+  float GetTargetBrightness() const;
+
+  // Sets the grayscale on the delegate. May cause an implicit animation.
+  virtual void SetGrayscale(float grayscale);
+  float GetTargetGrayscale() const;
+
   // Sets the layer animation delegate the animator is associated with. The
   // animator does not own the delegate.
   void SetDelegate(LayerAnimationDelegate* delegate);
 
   // Sets the animation preemption strategy. This determines the behaviour if
   // a property is set during an animation. The default is
   // IMMEDIATELY_SET_NEW_TARGET (see ImmediatelySetNewTarget below).
   void set_preemption_strategy(PreemptionStrategy strategy) {
     preemption_strategy_ = strategy;
   }
@@ skipping 215 matching lines @@
   // Observers are notified when layer animations end, are scheduled or are
   // aborted.
   ObserverList<LayerAnimationObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerAnimator);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_LAYER_ANIMATOR_H_