Disentangle updating the ScrollingCoordinator from RenderLayerCompositor

Source/core/rendering/compositing/RenderLayerCompositor.cpp

Index: Source/core/rendering/compositing/RenderLayerCompositor.cpp
diff --git a/Source/core/rendering/compositing/RenderLayerCompositor.cpp b/Source/core/rendering/compositing/RenderLayerCompositor.cpp
index d4fab7723c1051b906d53c92c08299e1c91fdc01..c7213c4e61d995a7eef7327ae25ba071e0542d0a 100644
--- a/Source/core/rendering/compositing/RenderLayerCompositor.cpp
+++ b/Source/core/rendering/compositing/RenderLayerCompositor.cpp
@@ -288,15 +288,11 @@ void RenderLayerCompositor::applyOverlayFullscreenVideoAdjustment()
 
 void RenderLayerCompositor::updateIfNeeded()
 {
-    CompositingUpdateType updateType = m_pendingUpdateType;
-    m_pendingUpdateType = CompositingUpdateNone;
-
-    if (!hasAcceleratedCompositing())
+    if (!hasAcceleratedCompositing() || m_pendingUpdateType == CompositingUpdateNone)
         return;
 
-    bool needsToUpdateScrollingCoordinator = scrollingCoordinator() && scrollingCoordinator()->needsToUpdateAfterCompositingChange();
-    if (updateType == CompositingUpdateNone && !needsToUpdateScrollingCoordinator)
-        return;
+    CompositingUpdateType updateType = m_pendingUpdateType;
+    m_pendingUpdateType = CompositingUpdateNone;
 
     RenderLayer* updateRoot = rootRenderLayer();
 
@@ -366,11 +362,6 @@ void RenderLayerCompositor::updateIfNeeded()
         m_needsUpdateFixedBackground = false;
     }
 
-    // The scrolling coordinator may realize that it needs updating while compositing was being updated in this function.
-    needsToUpdateScrollingCoordinator |= scrollingCoordinator() && scrollingCoordinator()->needsToUpdateAfterCompositingChange();
-    if (needsToUpdateScrollingCoordinator && m_renderView.frame()->isMainFrame() && scrollingCoordinator() && inCompositingMode())
-        scrollingCoordinator()->updateAfterCompositingChange();
-
     for (unsigned i = 0; i < layersNeedingRepaint.size(); i++) {
         RenderLayer* layer = layersNeedingRepaint[i];
         layer->repainter().computeRepaintRectsIncludingNonCompositingDescendants();