Make Blink stop scheduling its own Layout, and use the compositor's timer instead

Source/core/page/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 81 matching lines @@
     virtual PassRefPtr<Scrollbar> createScrollbar(ScrollbarOrientation);
 
     virtual void setContentsSize(const IntSize&);
 
     void layout(bool allowSubtree = true);
     bool didFirstLayout() const;
     void layoutTimerFired(Timer<FrameView>*);
     void scheduleRelayout();
     void scheduleRelayoutOfSubtree(RenderObject*);
     void unscheduleRelayout();
-    bool layoutPending() const;
+    bool layoutIsScheduledWithEmbedder() const;
     bool isInLayout() const { return m_inLayout; }
 
     void layoutLazyBlocks();
 
     RenderObject* layoutRoot(bool onlyDuringLayout = false) const;
     void clearLayoutRoot() { m_layoutRoot = 0; }
     int layoutCount() const { return m_layoutCount; }
 
     bool needsLayout() const;
     void setNeedsLayout();
@@ skipping 233 matching lines @@
 protected:
     virtual bool scrollContentsFastPath(const IntSize& scrollDelta, const IntRect& rectToScroll, const IntRect& clipRect);
     virtual void scrollContentsSlowPath(const IntRect& updateRect);
 
     virtual bool isVerticalDocument() const;
     virtual bool isFlippedDocument() const;
 
 private:
     explicit FrameView(Frame*);
 
+    void scheduleLayoutWithEmbedder();
+
     void reset();
     void init();
 
     virtual bool isFrameView() const OVERRIDE { return true; }
 
     friend class RenderWidget;
     bool useSlowRepaints(bool considerOverlap = true) const;
     bool useSlowRepaintsIfNotOverlapped() const;
     void updateCanBlitOnScrollRecursively();
     bool contentsInCompositedLayer() const;
@@ skipping 72 matching lines @@
     bool m_doFullRepaint;
 
     bool m_canHaveScrollbars;
     bool m_cannotBlitToWindow;
     bool m_isOverlapped;
     bool m_contentIsOpaque;
     unsigned m_slowRepaintObjectCount;
     int m_borderX;
     int m_borderY;
 
-    Timer<FrameView> m_layoutTimer;
+    bool m_layoutIsScheduledWithEmbedder;
     bool m_delayedLayout;
     RenderObject* m_layoutRoot;
 
     bool m_layoutSchedulingEnabled;
     bool m_inLayout;
     bool m_doingPreLayoutStyleUpdate;
     bool m_inSynchronousPostLayout;
     int m_layoutCount;
     unsigned m_nestedLayoutCount;
     Timer<FrameView> m_postLayoutTasksTimer;
@@ skipping 120 matching lines @@
     ASSERT(!widget || widget->isFrameView());
     return static_cast<const FrameView*>(widget);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toFrameView(const FrameView*);
 
 } // namespace WebCore
 
 #endif // FrameView_h