Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGTextPathElement.h

 /*
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef SVGTextPathElement_h
 #define SVGTextPathElement_h
 
 #include "core/SVGNames.h"
 #include "core/svg/SVGTextContentElement.h"
 #include "core/svg/SVGURIReference.h"
+#include "platform/heap/Handle.h"
 
 namespace blink {
 
 enum SVGTextPathMethodType {
     SVGTextPathMethodUnknown = 0,
     SVGTextPathMethodAlign,
     SVGTextPathMethodStretch
 };
 
 enum SVGTextPathSpacingType {
     SVGTextPathSpacingUnknown = 0,
     SVGTextPathSpacingAuto,
     SVGTextPathSpacingExact
 };
 
 template<> const SVGEnumerationStringEntries& getStaticStringEntries<SVGTextPathMethodType>();
 template<> const SVGEnumerationStringEntries& getStaticStringEntries<SVGTextPathSpacingType>();
 
 class SVGTextPathElement final : public SVGTextContentElement,
                                  public SVGURIReference {
     DEFINE_WRAPPERTYPEINFO();
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(SVGTextPathElement);
 public:
     // Forward declare enumerations in the W3C naming scheme, for IDL generation.
     enum {
         TEXTPATH_METHODTYPE_UNKNOWN = SVGTextPathMethodUnknown,
         TEXTPATH_METHODTYPE_ALIGN = SVGTextPathMethodAlign,
         TEXTPATH_METHODTYPE_STRETCH = SVGTextPathMethodStretch,
         TEXTPATH_SPACINGTYPE_UNKNOWN = SVGTextPathSpacingUnknown,
         TEXTPATH_SPACINGTYPE_AUTO = SVGTextPathSpacingAuto,
         TEXTPATH_SPACINGTYPE_EXACT = SVGTextPathSpacingExact
     };
 
     DECLARE_NODE_FACTORY(SVGTextPathElement);
 
     SVGAnimatedLength* startOffset() const { return m_startOffset.get(); }
     SVGAnimatedEnumeration<SVGTextPathMethodType>* method() { return m_method.get(); }
     SVGAnimatedEnumeration<SVGTextPathSpacingType>* spacing() { return m_spacing.get(); }
 
+    virtual void trace(Visitor*) override;
+
 private:
     explicit SVGTextPathElement(Document&);
 
     virtual ~SVGTextPathElement();
 
     void clearResourceReferences();
 
     virtual void buildPendingResource() override;
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) override;
     virtual void removedFrom(ContainerNode*) override;
 
     bool isSupportedAttribute(const QualifiedName&);
     virtual void svgAttributeChanged(const QualifiedName&) override;
 
     virtual RenderObject* createRenderer(RenderStyle*) override;
     virtual bool rendererIsNeeded(const RenderStyle&) override;
 
     virtual bool selfHasRelativeLengths() const override;
 
-    RefPtr<SVGAnimatedLength> m_startOffset;
-    RefPtr<SVGAnimatedEnumeration<SVGTextPathMethodType> > m_method;
-    RefPtr<SVGAnimatedEnumeration<SVGTextPathSpacingType> > m_spacing;
+    RefPtrWillBeMember<SVGAnimatedLength> m_startOffset;
+    RefPtrWillBeMember<SVGAnimatedEnumeration<SVGTextPathMethodType> > m_method;
+    RefPtrWillBeMember<SVGAnimatedEnumeration<SVGTextPathSpacingType> > m_spacing;
 };
 
 } // namespace blink
 
 #endif // SVGTextPathElement_h