Run smooth scroll animations on the compositor when possible

cc/layers/layer.cc

Index: cc/layers/layer.cc
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index a3a79b49cbb27b03ebca999a7bf5fe0dee5fd569..2490e64b9cb5b926eaba8f66635aad9f105dfe9e 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -1875,6 +1875,12 @@ void Layer::RemoveAnimation(int animation_id,
   SetNeedsCommit();
 }
 
+void Layer::AbortAnimation(int animation_id) {
+  DCHECK(layer_animation_controller_);
+  layer_animation_controller_->AbortAnimation(animation_id);
+  SetNeedsCommit();
+}
+
 void Layer::SetLayerAnimationControllerForTest(
     scoped_refptr<LayerAnimationController> controller) {
   DCHECK(layer_animation_controller_);