Run smooth scroll animations on the compositor when possible

cc/animation/animation_player.cc

Index: cc/animation/animation_player.cc
diff --git a/cc/animation/animation_player.cc b/cc/animation/animation_player.cc
index c237aa7fb8b17f5f7172f29d57d23a54ecdcb517..a5b742a273fa21fe50321d2d36f5e9d43b1979a0 100644
--- a/cc/animation/animation_player.cc
+++ b/cc/animation/animation_player.cc
@@ -153,6 +153,13 @@ void AnimationPlayer::RemoveAnimation(int animation_id) {
   }
 }
 
+void AnimationPlayer::AbortAnimation(int animation_id) {
+  DCHECK(element_animations_);
+  element_animations_->layer_animation_controller()->AbortAnimation(
+      animation_id);
+  SetNeedsCommit();
+}
+
 void AnimationPlayer::PushPropertiesTo(AnimationPlayer* player_impl) {
   if (!element_animations_) {
     if (player_impl->element_animations())