Run smooth scroll animations on the compositor when possible

cc/blink/web_layer_impl.h

Index: cc/blink/web_layer_impl.h
diff --git a/cc/blink/web_layer_impl.h b/cc/blink/web_layer_impl.h
index e6429156557d933b7c9fd204093fde99e725c8d1..8c7289558ee08d424f295301a29668c3e0ad8cd1 100644
--- a/cc/blink/web_layer_impl.h
+++ b/cc/blink/web_layer_impl.h
@@ -109,6 +109,7 @@ class WebLayerImpl : public blink::WebLayer {
   void removeAnimation(int animation_id,
                        blink::WebCompositorAnimation::TargetProperty) override;
   void pauseAnimation(int animation_id, double time_offset) override;
+  void abortAnimation(int animation_id) override;
   bool hasActiveAnimation() override;
   void setForceRenderSurface(bool force) override;
   void setScrollPositionDouble(blink::WebDoublePoint position) override;