Revert of Remove PaintInfo's paintingRoot

third_party/WebKit/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 204 matching lines @@
     void addPart(LayoutPart*);
     void removePart(LayoutPart*);
 
     void updateWidgetGeometries();
 
     void addPartToUpdate(LayoutEmbeddedObject&);
 
     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.
     // If lifecycle throttling is allowed (see DocumentLifecycle::PreventThrottlingScope), some frames may skip the lifecycle update
     // (e.g., based on visibility) and will not end up being PaintInvalidationClean.
     void updateAllLifecyclePhases();
 
     // Computes the style, layout and compositing lifecycle stages if needed. After calling this method, all frames will be in a lifecycle
     // state >= CompositingClean, and scrolling has been updated (unless throttling is allowed).
     void updateLifecycleToCompositingCleanPlusScrolling();
@@ skipping 557 matching lines @@
     IntSize m_lastViewportSize;
     float m_lastZoomFactor;
 
     AtomicString m_mediaType;
     AtomicString m_mediaTypeWhenNotPrinting;
 
     bool m_safeToPropagateScrollToParent;
 
     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;
 
     unsigned m_visuallyNonEmptyCharacterCount;
     unsigned m_visuallyNonEmptyPixelCount;
     bool m_isVisuallyNonEmpty;
 
     RefPtrWillBeMember<Node> m_scrollAnchor;
 
     // layoutObject to hold our custom scroll corner.
@@ skipping 103 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