Plumb smooth scrolling in Chromium compositor

content/renderer/input/input_handler_wrapper.h

Index: content/renderer/input/input_handler_wrapper.h
diff --git a/content/renderer/input/input_handler_wrapper.h b/content/renderer/input/input_handler_wrapper.h
index 5c925d0515bea1f713d9fc15e65c14896982f2f3..8e34050e87557a10e532a5492741c3ad4fd47449 100644
--- a/content/renderer/input/input_handler_wrapper.h
+++ b/content/renderer/input/input_handler_wrapper.h
@@ -35,6 +35,13 @@ class InputHandlerWrapper : public InputHandlerProxyClient {
       blink::WebGestureDevice deviceSource,
       const blink::WebFloatPoint& velocity,
       const blink::WebSize& cumulativeScroll) override;
+  blink::WebGestureCurve* CreateSmoothScrollAnimationCurve(
+      blink::WebGestureDevice deviceSource,
+      float start_x,
+      float start_y,
+      float dx,
+      float dy,
+      long duration) override;
   void DidOverscroll(const DidOverscrollParams& params) override;
   void DidStopFlinging() override;
   void DidAnimateForInput() override;