Add a FrameView lifecycle method that just updates layout, style and compositing.

Source/core/frame/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
@@ skipping 209 matching lines @@
     PaintBehavior paintBehavior() const;
     void setIsPainting(bool val) { m_isPainting = val; }
     bool isPainting() const;
     void setLastPaintTime(double val) { m_lastPaintTime = val; }
     bool hasEverPainted() const { return m_lastPaintTime; }
     void setNodeToDraw(Node*);
     Node* nodeToDraw() { return m_nodeToDraw.get(); }
 
     Color documentBackgroundColor() const;
 
-    void updateLayoutAndStyleForPainting();
+    // Run all needed lifecycle stages. After calling this method, all frames will be in the lifecycle state PaintInvalidationClean.
+    void updateAllLifecyclePhases();
+
+    // Computes the style, layout and compositing lifecycle stages if needed. After calling this method, all frames wil lbe in a lifecycle
+    // state >= CompositingClean, and scrolling has been updated.
+    void updateLifecycleToCompositingCleanPlusScrolling();
 
     bool invalidateViewportConstrainedObjects();
 
     void incrementVisuallyNonEmptyCharacterCount(unsigned);
     void incrementVisuallyNonEmptyPixelCount(const IntSize&);
     void setIsVisuallyNonEmpty() { m_isVisuallyNonEmpty = true; }
     void enableAutoSizeMode(const IntSize& minSize, const IntSize& maxSize);
     void disableAutoSizeMode();
 
     void forceLayoutForPagination(const FloatSize& pageSize, const FloatSize& originalPageSize, float maximumShrinkFactor);
@@ skipping 355 matching lines @@
     private:
         TemporaryChange<bool> m_scope;
     };
 
 private:
     explicit FrameView(LocalFrame*);
 
     virtual void setScrollOffset(const IntPoint&, ScrollType) override;
     virtual void setScrollOffset(const DoublePoint&, ScrollType) override;
 
-    void updateLayoutAndStyleForPaintingInternal();
+    void updateAllLifecyclePhasesInternal();
     void invalidateTreeIfNeededRecursive();
     void scrollContentsIfNeededRecursive();
-    void updateLayoutAndStyleIfNeededRecursive();
+    void updateStyleAndLayoutIfNeededRecursive();
+    void updatePostLifecycleData();
 
     void reset();
     void init();
 
     void clearLayoutSubtreeRootsAndMarkContainingBlocks();
 
     // Called when our frame rect changes (or the rect/scroll position of an ancestor changes).
     virtual void frameRectsChanged() override;
 
     friend class LayoutPart;
@@ skipping 247 matching lines @@
     static const unsigned visualPixelThreshold = 32 * 32;
     if (m_visuallyNonEmptyPixelCount > visualPixelThreshold)
         setIsVisuallyNonEmpty();
 }
 
 DEFINE_TYPE_CASTS(FrameView, Widget, widget, widget->isFrameView(), widget.isFrameView());
 
 } // namespace blink
 
 #endif // FrameView_h