Disentangle updating the ScrollingCoordinator from RenderLayerCompositor

Source/core/frame/FrameView.cpp

Index: Source/core/frame/FrameView.cpp
diff --git a/Source/core/frame/FrameView.cpp b/Source/core/frame/FrameView.cpp
index 435e97d6ac56d24c511d203ed434af4c0ae6d92a..060b1587d439f485b2557b0e3d6b4e93227b9769 100644
--- a/Source/core/frame/FrameView.cpp
+++ b/Source/core/frame/FrameView.cpp
@@ -2832,7 +2832,12 @@ void FrameView::updateLayoutAndStyleForPainting()
 
     if (RenderView* view = renderView()) {
         InspectorInstrumentation::willUpdateLayerTree(view->frame());
+
         view->compositor()->updateIfNeededRecursive();
+
+        if (view->compositor()->inCompositingMode() && m_frame->isMainFrame())
+            m_frame->page()->scrollingCoordinator()->updateAfterCompositingChangeIfNeeded();
+
         InspectorInstrumentation::didUpdateLayerTree(view->frame());
     }