Disentangle updating the ScrollingCoordinator from RenderLayerCompositor

Source/core/page/scrolling/ScrollingCoordinator.cpp

Index: Source/core/page/scrolling/ScrollingCoordinator.cpp
diff --git a/Source/core/page/scrolling/ScrollingCoordinator.cpp b/Source/core/page/scrolling/ScrollingCoordinator.cpp
index 44e1df16a7fe1d7cd0d587a3403a4ccef6081f5b..02771f3f761bf37035cd4d73b716e92e8733527d 100644
--- a/Source/core/page/scrolling/ScrollingCoordinator.cpp
+++ b/Source/core/page/scrolling/ScrollingCoordinator.cpp
@@ -122,9 +122,12 @@ void ScrollingCoordinator::notifyLayoutUpdated()
     m_shouldScrollOnMainThreadDirty = true;
 }
 
-void ScrollingCoordinator::updateAfterCompositingChange()
+void ScrollingCoordinator::updateAfterCompositingChangeIfNeeded()
 {
-    TRACE_EVENT0("input", "ScrollingCoordinator::updateAfterCompositingChange");
+    if (!shouldUpdateAfterCompositingChange())
+        return;
+
+    TRACE_EVENT0("input", "ScrollingCoordinator::updateAfterCompositingChangeIfNeeded");
 
     if (m_scrollGestureRegionIsDirty) {
         // Compute the region of the page where we can't handle scroll gestures and mousewheel events