Update programmatic scrolls on the RootFrameViewport.

Source/core/frame/RootFrameViewport.cpp

Index: Source/core/frame/RootFrameViewport.cpp
diff --git a/Source/core/frame/RootFrameViewport.cpp b/Source/core/frame/RootFrameViewport.cpp
index e5107b10de9c20e41b2f0d635cddb9cb6e076888..74f6b858ebae01d00fde295f647f98403cca532e 100644
--- a/Source/core/frame/RootFrameViewport.cpp
+++ b/Source/core/frame/RootFrameViewport.cpp
@@ -315,4 +315,11 @@ void RootFrameViewport::serviceScrollAnimations(double monotonicTime)
     layoutViewport().serviceScrollAnimations(monotonicTime);
 }
 
+void RootFrameViewport::updateCompositorScrollAnimations()
+{
+    ScrollableArea::updateCompositorScrollAnimations();
+    layoutViewport().updateCompositorScrollAnimations();
+}
+
+
 } // namespace blink