Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGFitToViewBox.h

 /*
  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Rob Buis <buis@kde.org>
  * Copyright (C) 2014 Samsung Electronics. 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 13 matching lines @@
 
 #include "core/SVGNames.h"
 #include "core/dom/Document.h"
 #include "core/dom/QualifiedName.h"
 #include "core/svg/SVGAnimatedPreserveAspectRatio.h"
 #include "core/svg/SVGAnimatedRect.h"
 #include "core/svg/SVGDocumentExtensions.h"
 #include "core/svg/SVGParsingError.h"
 #include "core/svg/SVGPreserveAspectRatio.h"
 #include "core/svg/SVGRect.h"
+#include "platform/heap/Handle.h"
 #include "wtf/HashSet.h"
 
 namespace blink {
 
 class AffineTransform;
 class Document;
 
-class SVGFitToViewBox {
+class SVGFitToViewBox : public WillBeGarbageCollectedMixin {
 public:
     enum PropertyMapPolicy {
         PropertyMapPolicyAdd,
         PropertyMapPolicySkip,
     };
 
-    static AffineTransform viewBoxToViewTransform(const FloatRect& viewBoxRect, PassRefPtr<SVGPreserveAspectRatio>, float viewWidth, float viewHeight);
+    static AffineTransform viewBoxToViewTransform(const FloatRect& viewBoxRect, PassRefPtrWillBeRawPtr<SVGPreserveAspectRatio>, float viewWidth, float viewHeight);
 
     static bool isKnownAttribute(const QualifiedName&);
     static void addSupportedAttributes(HashSet<QualifiedName>&);
 
     bool parseAttribute(const QualifiedName& name, const AtomicString& value, Document& document, SVGParsingError& parseError)
     {
         if (name == SVGNames::viewBoxAttr) {
             m_viewBox->setBaseValueAsString(value, parseError);
             return true;
         }
         if (name == SVGNames::preserveAspectRatioAttr) {
             m_preserveAspectRatio->setBaseValueAsString(value, parseError);
             return true;
         }
         return false;
     }
 
     bool hasEmptyViewBox() const { return m_viewBox->currentValue()->isValid() && m_viewBox->currentValue()->value().isEmpty(); }
 
     // JS API
     SVGAnimatedRect* viewBox() const { return m_viewBox.get(); }
     SVGAnimatedPreserveAspectRatio* preserveAspectRatio() const { return m_preserveAspectRatio.get(); }
 
+    virtual void trace(Visitor*);
+
 protected:
     explicit SVGFitToViewBox(SVGElement*, PropertyMapPolicy = PropertyMapPolicyAdd);
     void updateViewBox(const FloatRect&);
     void clearViewBox() { m_viewBox = nullptr; }
     void clearPreserveAspectRatio() { m_preserveAspectRatio = nullptr; }
 
 private:
-    RefPtr<SVGAnimatedRect> m_viewBox;
-    RefPtr<SVGAnimatedPreserveAspectRatio> m_preserveAspectRatio;
+    RefPtrWillBeMember<SVGAnimatedRect> m_viewBox;
+    RefPtrWillBeMember<SVGAnimatedPreserveAspectRatio> m_preserveAspectRatio;
 };
 
 } // namespace blink
 
 #endif // SVGFitToViewBox_h