[SVG2] Elements that don't render shouldn't contribute to ancestor bboxes.

Source/core/rendering/svg/RenderSVGPath.cpp

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2005, 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
  * Copyright (C) 2011 Renata Hodovan <reni@webkit.org>
  * Copyright (C) 2011 University of Szeged
@@ skipping 142 matching lines @@
     m_zeroLengthLinecapLocations.clear();
 
     if (!strokeWidth() || !shouldStrokeZeroLengthSubpath())
         return;
 
     SVGSubpathData subpathData(m_zeroLengthLinecapLocations);
     path().apply(&subpathData, SVGSubpathData::updateFromPathElement);
     subpathData.pathIsDone();
 }
 
+bool RenderSVGPath::isRenderingDisabled() const
+{
+    // For a polygon, polyline and path, rendering is disabled if the d
+    // or points attribute is missing or empty.
+    return path().isEmpty();
 }
+
+}