Revert of Remove PaintInfo's paintingRoot

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

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 169 matching lines @@
     // Verify that the LocalFrame has a different FrameView or
     // that it is being detached and destructed.
     ASSERT(frame().view() != this || !layoutView());
 #endif
 }
 
 DEFINE_TRACE(FrameView)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_frame);
+    visitor->trace(m_nodeToDraw);
     visitor->trace(m_scrollAnchor);
     visitor->trace(m_scrollableAreas);
     visitor->trace(m_animatingScrollableAreas);
     visitor->trace(m_autoSizeInfo);
     visitor->trace(m_horizontalScrollbar);
     visitor->trace(m_verticalScrollbar);
     visitor->trace(m_children);
     visitor->trace(m_viewportScrollableArea);
 #endif
     Widget::trace(visitor);
@@ skipping 2109 matching lines @@
         return toLocalFrame(parentFrame)->view();
 
     return nullptr;
 }
 
 bool FrameView::isPainting() const
 {
     return m_isPainting;
 }
 
+void FrameView::setNodeToDraw(Node* node)
+{
+    m_nodeToDraw = node;
+}
+
 void FrameView::updateWidgetGeometriesIfNeeded()
 {
     if (!m_needsUpdateWidgetGeometries)
         return;
 
     m_needsUpdateWidgetGeometries = false;
 
     updateWidgetGeometries();
 }
 
@@ skipping 1697 matching lines @@
     return m_hiddenForThrottling && m_crossOriginForThrottling;
 }
 
 LayoutBox& FrameView::boxForScrollControlPaintInvalidation() const
 {
     ASSERT(layoutView());
     return *layoutView();
 }
 
 } // namespace blink