Plumb smooth scrolling in Chromium compositor

content/child/blink_platform_impl.h

Index: content/child/blink_platform_impl.h
diff --git a/content/child/blink_platform_impl.h b/content/child/blink_platform_impl.h
index b1b6e21367b85df889e5a397325593f51450cedf..911b58ba499673a422c4367793c7ac1b7f66ff9b 100644
--- a/content/child/blink_platform_impl.h
+++ b/content/child/blink_platform_impl.h
@@ -162,6 +162,15 @@ class CONTENT_EXPORT BlinkPlatformImpl
       blink::WebGestureDevice device_source,
       const blink::WebFloatPoint& velocity,
       const blink::WebSize& cumulative_scroll);
+
+  virtual blink::WebGestureCurve* createSmoothScrollAnimationCurve(
+      blink::WebGestureDevice device_source,
+      float start_x,
+      float start_y,
+      float dx,
+      float dy,
+      int64_t duration);
+
   virtual void didStartWorkerRunLoop();
   virtual void didStopWorkerRunLoop();
   virtual blink::WebCrypto* crypto();