Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGLinearGradientElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2010. 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
  * License as published by the Free Software Foundation; either
@@ skipping 30 matching lines @@
 {
     // Spec: If the x2 attribute is not specified, the effect is as if a value of "100%" were specified.
     m_x2->setDefaultValueAsString("100%");
 
     addToPropertyMap(m_x1);
     addToPropertyMap(m_y1);
     addToPropertyMap(m_x2);
     addToPropertyMap(m_y2);
 }
 
+void SVGLinearGradientElement::trace(Visitor* visitor)
+{
+    visitor->trace(m_x1);
+    visitor->trace(m_y1);
+    visitor->trace(m_x2);
+    visitor->trace(m_y2);
+    SVGGradientElement::trace(visitor);
+}
+
 DEFINE_NODE_FACTORY(SVGLinearGradientElement)
 
 bool SVGLinearGradientElement::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 101 matching lines @@
 
 bool SVGLinearGradientElement::selfHasRelativeLengths() const
 {
     return m_x1->currentValue()->isRelative()
         || m_y1->currentValue()->isRelative()
         || m_x2->currentValue()->isRelative()
         || m_y2->currentValue()->isRelative();
 }
 
 } // namespace blink