Fix table background painting

third_party/WebKit/Source/core/layout/LayoutTableRow.cpp

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2013 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 237 matching lines @@
 
     // The cell and the row share the section's coordinate system. However
     // the visual overflow should be determined in the coordinate system of
     // the row, that's why we shift it below.
     LayoutUnit cellOffsetLogicalTopDifference = cell->location().y() - location().y();
     cellVisualOverflowRect.move(LayoutUnit(), cellOffsetLogicalTopDifference);
 
     addVisualOverflow(cellVisualOverflowRect);
 }
 
+
+LayoutRect LayoutTableRow::positionByCellSpan() const
+{
+    LayoutTableSection * section = this->section();
+    LayoutRect position = section->getCellPhysicalPosition(rowIndex(), 0);
+    position.uniteEvenIfEmpty(section->getCellPhysicalPosition(rowIndex(), section->numEffectiveColumns() - 1));
+    return position;
+}
+
 } // namespace blink