Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGLineElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 21 matching lines @@
     , m_y1(SVGAnimatedLength::create(this, SVGNames::y1Attr, SVGLength::create(LengthModeHeight), AllowNegativeLengths))
     , m_x2(SVGAnimatedLength::create(this, SVGNames::x2Attr, SVGLength::create(LengthModeWidth), AllowNegativeLengths))
     , m_y2(SVGAnimatedLength::create(this, SVGNames::y2Attr, SVGLength::create(LengthModeHeight), AllowNegativeLengths))
 {
     addToPropertyMap(m_x1);
     addToPropertyMap(m_y1);
     addToPropertyMap(m_x2);
     addToPropertyMap(m_y2);
 }
 
+void SVGLineElement::trace(Visitor* visitor)
+{
+    visitor->trace(m_x1);
+    visitor->trace(m_y1);
+    visitor->trace(m_x2);
+    visitor->trace(m_y2);
+    SVGGeometryElement::trace(visitor);
+}
+
 DEFINE_NODE_FACTORY(SVGLineElement)
 
 bool SVGLineElement::isSupportedAttribute(const QualifiedName& attrName)
 {
     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     if (supportedAttributes.isEmpty()) {
         supportedAttributes.add(SVGNames::x1Attr);
         supportedAttributes.add(SVGNames::x2Attr);
         supportedAttributes.add(SVGNames::y1Attr);
         supportedAttributes.add(SVGNames::y2Attr);
@@ skipping 38 matching lines @@
 
 bool SVGLineElement::selfHasRelativeLengths() const
 {
     return m_x1->currentValue()->isRelative()
         || m_y1->currentValue()->isRelative()
         || m_x2->currentValue()->isRelative()
         || m_y2->currentValue()->isRelative();
 }
 
 } // namespace blink