Disentangle updating the ScrollingCoordinator from RenderLayerCompositor

Source/core/page/scrolling/ScrollingCoordinator.h

Index: Source/core/page/scrolling/ScrollingCoordinator.h
diff --git a/Source/core/page/scrolling/ScrollingCoordinator.h b/Source/core/page/scrolling/ScrollingCoordinator.h
index 256ef402c63c6735ed707336bf3c645a59712700..7d5eea09d037a649227e81e70849a32dc720a45a 100644
--- a/Source/core/page/scrolling/ScrollingCoordinator.h
+++ b/Source/core/page/scrolling/ScrollingCoordinator.h
@@ -64,10 +64,7 @@ public:
     // Called when any frame has done its layout.
     void notifyLayoutUpdated();
 
-    // Should be called after compositing has been updated.
-    void updateAfterCompositingChange();
-
-    bool needsToUpdateAfterCompositingChange() const { return m_scrollGestureRegionIsDirty || m_touchEventTargetRectsAreDirty || frameViewIsDirty(); }
+    void updateAfterCompositingChangeIfNeeded();
 
     void updateHaveWheelEventHandlers();
     void updateHaveScrollEventHandlers();
@@ -132,6 +129,8 @@ protected:
     bool m_shouldScrollOnMainThreadDirty;
 
 private:
+    bool shouldUpdateAfterCompositingChange() const { return m_scrollGestureRegionIsDirty || m_touchEventTargetRectsAreDirty || frameViewIsDirty(); }
+
     void setShouldUpdateScrollLayerPositionOnMainThread(MainThreadScrollingReasons);
 
     bool hasVisibleSlowRepaintViewportConstrainedObjects(FrameView*) const;