Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGStopElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2007, 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 14 matching lines @@
 
 namespace blink {
 
 inline SVGStopElement::SVGStopElement(Document& document)
     : SVGElement(SVGNames::stopTag, document)
     , m_offset(SVGAnimatedNumber::create(this, SVGNames::offsetAttr, SVGNumberAcceptPercentage::create()))
 {
     addToPropertyMap(m_offset);
 }
 
+void SVGStopElement::trace(Visitor* visitor)
+{
+    visitor->trace(m_offset);
+    SVGElement::trace(visitor);
+}
+
 DEFINE_NODE_FACTORY(SVGStopElement)
 
 void SVGStopElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     parseAttributeNew(name, value);
 }
 
 void SVGStopElement::svgAttributeChanged(const QualifiedName& attrName)
 {
     if (attrName == SVGNames::offsetAttr) {
@@ skipping 24 matching lines @@
     // which the renderer or style is null. This entire class is scheduled for removal (Bug WK 86941)
     // and we will tolerate this null check until then.
     if (!style)
         return Color(Color::transparent); // Transparent black.
 
     const SVGRenderStyle& svgStyle = style->svgStyle();
     return svgStyle.stopColor().combineWithAlpha(svgStyle.stopOpacity());
 }
 
 } // namespace blink