Plumb smooth scrolling in Chromium compositor

content/child/blink_platform_impl.cc

Index: content/child/blink_platform_impl.cc
diff --git a/content/child/blink_platform_impl.cc b/content/child/blink_platform_impl.cc
index d743fffac4636fee02a2845e2dc1a113205cf13d..ad6eef3f71c260eb8ad489fbb065968837776ee6 100644
--- a/content/child/blink_platform_impl.cc
+++ b/content/child/blink_platform_impl.cc
@@ -1145,6 +1145,20 @@ blink::WebGestureCurve* BlinkPlatformImpl::createFlingAnimationCurve(
              IsMainThread()).release();
 }
 
+blink::WebGestureCurve* BlinkPlatformImpl::createSmoothScrollAnimationCurve(
+    blink::WebGestureDevice device_source,
+    float start_x,
+    float start_y,
+    float dx,
+    float dy,
+    int64 duration) {
+  base::TimeDelta duration_time_delta =
+      base::TimeDelta::FromMilliseconds(duration);
+  return ui::WebGestureCurveImpl::CreateFromSmoothScrollingCurve(
+             start_x, start_y, dx, dy, duration_time_delta, IsMainThread())
+      .release();
+}
+
 void BlinkPlatformImpl::didStartWorkerRunLoop() {
   WorkerTaskRunner* worker_task_runner = WorkerTaskRunner::Instance();
   worker_task_runner->OnWorkerRunLoopStarted();