Revert of Remove PaintInfo's paintingRoot

third_party/WebKit/Source/core/frame/FrameView.h

Index: third_party/WebKit/Source/core/frame/FrameView.h
diff --git a/third_party/WebKit/Source/core/frame/FrameView.h b/third_party/WebKit/Source/core/frame/FrameView.h
index 53d53dcbfd1d5c38fc1ef368223222ae2bb69038..709ec18135c0a371b54ab6f8dc772b498631a2ce 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.h
+++ b/third_party/WebKit/Source/core/frame/FrameView.h
@@ -222,6 +222,9 @@
     void setIsPainting(bool val) const { m_isPainting = val; }
     bool isPainting() const;
 
+    void setNodeToDraw(Node*);
+    Node* nodeToDraw() const { return m_nodeToDraw.get(); }
+
     Color documentBackgroundColor() const;
 
     // Run all needed lifecycle stages. After calling this method, all frames will be in the lifecycle state PaintInvalidationClean.
@@ -799,6 +802,8 @@
 
     bool m_isTrackingPaintInvalidations; // Used for testing.
 
+    RefPtrWillBeMember<Node> m_nodeToDraw;
+
     // TODO(wangxianzhu): Use document cycle state for spv2 and synchronzied painting.
     mutable bool m_isPainting;