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

Source/core/page/FrameView.h

Index: Source/core/page/FrameView.h
diff --git a/Source/core/page/FrameView.h b/Source/core/page/FrameView.h
index ff021cf007f9659f1daf79d2159ae7c9807b55b5..a2af7015697679b0680ade290a601a28c82282a6 100644
--- a/Source/core/page/FrameView.h
+++ b/Source/core/page/FrameView.h
@@ -99,7 +99,7 @@ public:
     void scheduleRelayout();
     void scheduleRelayoutOfSubtree(RenderObject*);
     void unscheduleRelayout();
-    bool layoutPending() const;
+    bool layoutIsScheduledWithEmbedder() const;
     bool isInLayout() const { return m_inLayout; }
 
     void layoutLazyBlocks();
@@ -353,6 +353,8 @@ protected:
 private:
     explicit FrameView(Frame*);
 
+    void scheduleLayoutWithEmbedder();
+
     void reset();
     void init();
 
@@ -445,7 +447,7 @@ private:
     int m_borderX;
     int m_borderY;
 
-    Timer<FrameView> m_layoutTimer;
+    bool m_layoutIsScheduledWithEmbedder;
     bool m_delayedLayout;
     RenderObject* m_layoutRoot;