Revert of Remove PaintInfo's paintingRoot

third_party/WebKit/Source/core/paint/FieldsetPainter.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/FieldsetPainter.h"
 
 #include "core/layout/LayoutFieldset.h"
 #include "core/paint/BoxDecorationData.h"
 #include "core/paint/BoxPainter.h"
 #include "core/paint/LayoutObjectDrawingRecorder.h"
 #include "core/paint/PaintInfo.h"
 #include "platform/graphics/GraphicsContextStateSaver.h"
 
 namespace blink {
 
 void FieldsetPainter::paintBoxDecorationBackground(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
+    if (!paintInfo.shouldPaintWithinRoot(&m_layoutFieldset))
+        return;
+
     LayoutRect paintRect(paintOffset, m_layoutFieldset.size());
     LayoutBox* legend = m_layoutFieldset.findInFlowLegend();
     if (!legend)
         return BoxPainter(m_layoutFieldset).paintBoxDecorationBackground(paintInfo, paintOffset);
 
     if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(paintInfo.context, m_layoutFieldset, paintInfo.phase, paintOffset))
         return;
 
     // FIXME: We need to work with "rl" and "bt" block flow directions.  In those
     // cases the legend is embedded in the right and bottom borders respectively.
@@ skipping 63 matching lines @@
         LayoutUnit xOff = (legend->location().x() > 0) ? LayoutUnit() : (legend->size().width() - m_layoutFieldset.borderLeft()) / 2;
         paintRect.expand(-xOff, 0);
         paintRect.move(xOff, 0);
     }
 
     LayoutObjectDrawingRecorder recorder(paintInfo.context, m_layoutFieldset, paintInfo.phase, paintRect, paintOffset);
     BoxPainter(m_layoutFieldset).paintMaskImages(paintInfo, paintRect);
 }
 
 } // namespace blink