Reland r107720 - Enable the new layer animation framework.

ui/gfx/compositor/layer_animation_sequence.h

Index: ui/gfx/compositor/layer_animation_sequence.h
diff --git a/ui/gfx/compositor/layer_animation_sequence.h b/ui/gfx/compositor/layer_animation_sequence.h
index 87673d7676608deec1b574ca9bd6109967350803..9531765f81f4cb51dadf9414d898c0ae8a902027 100644
--- a/ui/gfx/compositor/layer_animation_sequence.h
+++ b/ui/gfx/compositor/layer_animation_sequence.h
@@ -37,6 +37,10 @@ class COMPOSITOR_EXPORT LayerAnimationSequence {
   // guaranteed that Animate will be called with elapsed = Duration().
   void Progress(base::TimeDelta elapsed, LayerAnimationDelegate* delegate);
 
+  // Sets the delegate's properties to the values that would have been set had
+  // the sequence completed. Does nothing if the sequence is cyclic.
+  void SetTarget(LayerAnimationDelegate* delegate) const;
+
   // Aborts the given animation.
   void Abort();