Reland of un smooth scroll animations on the compositor when possible

cc/blink/web_layer_impl.cc

Index: cc/blink/web_layer_impl.cc
diff --git a/cc/blink/web_layer_impl.cc b/cc/blink/web_layer_impl.cc
index cdf316036654040f0ef1228f7e002ece0b6885e5..13d5cc8ce5643be9bcfe96ba2f12a0d94e7d77e5 100644
--- a/cc/blink/web_layer_impl.cc
+++ b/cc/blink/web_layer_impl.cc
@@ -270,6 +270,10 @@
   layer_->PauseAnimation(animation_id, time_offset);
 }
 
+void WebLayerImpl::abortAnimation(int animation_id) {
+  layer_->AbortAnimation(animation_id);
+}
+
 bool WebLayerImpl::hasActiveAnimation() {
   return layer_->HasActiveAnimation();
 }