Animations: Port ProgrammaticScrollAnimator to use compositor timelines

Source/platform/scroll/ScrollableArea.cpp

Index: Source/platform/scroll/ScrollableArea.cpp
diff --git a/Source/platform/scroll/ScrollableArea.cpp b/Source/platform/scroll/ScrollableArea.cpp
index f4e59a6d9842ba96675f15b0d57cb73c710997a0..e26773186f9953612798139083e6ca52d94e3c95 100644
--- a/Source/platform/scroll/ScrollableArea.cpp
+++ b/Source/platform/scroll/ScrollableArea.cpp
@@ -487,10 +487,10 @@ bool ScrollableArea::hasLayerForScrollCorner() const
     return layerForScrollCorner();
 }
 
-void ScrollableArea::layerForScrollingDidChange()
+void ScrollableArea::layerForScrollingDidChange(WebCompositorAnimationTimeline* timeline)
 {
     if (ProgrammaticScrollAnimator* programmaticScrollAnimator = existingProgrammaticScrollAnimator())
-        programmaticScrollAnimator->layerForCompositedScrollingDidChange();
+        programmaticScrollAnimator->layerForCompositedScrollingDidChange(timeline);
 }
 
 bool ScrollableArea::scheduleAnimation()