Plumb smooth scrolling in Chromium compositor

ui/events/gestures/blink/web_gesture_curve_impl.h

Index: ui/events/gestures/blink/web_gesture_curve_impl.h
diff --git a/ui/events/gestures/blink/web_gesture_curve_impl.h b/ui/events/gestures/blink/web_gesture_curve_impl.h
index feb17383c587fee98497c36e470039eed6999d13..05db6fc9aeb68f87fb989e342a2bf210a24fd570 100644
--- a/ui/events/gestures/blink/web_gesture_curve_impl.h
+++ b/ui/events/gestures/blink/web_gesture_curve_impl.h
@@ -7,6 +7,7 @@
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/time/time.h"
 #include "third_party/WebKit/public/platform/WebGestureCurve.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 
@@ -23,6 +24,15 @@ class WebGestureCurveImpl : public NON_EXPORTED_BASE(blink::WebGestureCurve) {
       const gfx::Vector2dF& initial_velocity,
       const gfx::Vector2dF& initial_offset,
       bool on_main_thread);
+
+  static scoped_ptr<WebGestureCurve> CreateFromSmoothScrollingCurve(
+      float start_x,
+      float start_y,
+      float dx,
+      float dy,
+      base::TimeDelta duration,
+      bool on_main_thread);
+
   static scoped_ptr<blink::WebGestureCurve> CreateFromUICurveForTesting(
       scoped_ptr<GestureCurve> curve,
       const gfx::Vector2dF& initial_offset);