Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGGraphicsElement.h

 /*
  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2014 Google, Inc.
  *
  * 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 SVGGraphicsElement_h
 #define SVGGraphicsElement_h
 
 #include "core/svg/SVGAnimatedTransformList.h"
 #include "core/svg/SVGElement.h"
 #include "core/svg/SVGRectTearOff.h"
 #include "core/svg/SVGTests.h"
+#include "platform/heap/Handle.h"
 
 namespace blink {
 
 class AffineTransform;
 class Path;
 class SVGMatrixTearOff;
 
 class SVGGraphicsElement : public SVGElement, public SVGTests {
     DEFINE_WRAPPERTYPEINFO();
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(SVGGraphicsElement);
 public:
     virtual ~SVGGraphicsElement();
 
     enum StyleUpdateStrategy { AllowStyleUpdate, DisallowStyleUpdate };
 
     AffineTransform getCTM(StyleUpdateStrategy = AllowStyleUpdate);
     AffineTransform getScreenCTM(StyleUpdateStrategy = AllowStyleUpdate);
-    PassRefPtr<SVGMatrixTearOff> getCTMFromJavascript();
-    PassRefPtr<SVGMatrixTearOff> getScreenCTMFromJavascript();
+    PassRefPtrWillBeRawPtr<SVGMatrixTearOff> getCTMFromJavascript();
+    PassRefPtrWillBeRawPtr<SVGMatrixTearOff> getScreenCTMFromJavascript();
 
-    PassRefPtr<SVGMatrixTearOff> getTransformToElement(SVGElement*, ExceptionState&);
+    PassRefPtrWillBeRawPtr<SVGMatrixTearOff> getTransformToElement(SVGElement*, ExceptionState&);
 
     SVGElement* nearestViewportElement() const;
     SVGElement* farthestViewportElement() const;
 
     virtual AffineTransform localCoordinateSpaceTransform(SVGElement::CTMScope) const override { return animatedLocalTransform(); }
     virtual AffineTransform animatedLocalTransform() const;
     virtual AffineTransform* animateMotionTransform() override;
 
     virtual FloatRect getBBox();
-    PassRefPtr<SVGRectTearOff> getBBoxFromJavascript();
+    PassRefPtrWillBeRawPtr<SVGRectTearOff> getBBoxFromJavascript();
 
     // "base class" methods for all the elements which render as paths
     virtual void toClipPath(Path&);
     virtual RenderObject* createRenderer(RenderStyle*) override;
 
     virtual bool isValid() const override final { return SVGTests::isValid(); }
 
     SVGAnimatedTransformList* transform() { return m_transform.get(); }
     const SVGAnimatedTransformList* transform() const { return m_transform.get(); }
 
     AffineTransform computeCTM(SVGElement::CTMScope mode, SVGGraphicsElement::StyleUpdateStrategy,
         const SVGGraphicsElement* ancestor = 0) const;
 
+    virtual void trace(Visitor*) override;
+
 protected:
     SVGGraphicsElement(const QualifiedName&, Document&, ConstructionType = CreateSVGElement);
 
     virtual bool supportsFocus() const override { return Element::supportsFocus() || hasFocusEventListeners(); }
 
     bool isSupportedAttribute(const QualifiedName&);
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) override;
     virtual void svgAttributeChanged(const QualifiedName&) override;
 
-    RefPtr<SVGAnimatedTransformList> m_transform;
+    RefPtrWillBeMember<SVGAnimatedTransformList> m_transform;
 
 private:
     virtual bool isSVGGraphicsElement() const override final { return true; }
 };
 
 inline bool isSVGGraphicsElement(const SVGElement& element)
 {
     return element.isSVGGraphicsElement();
 }
 
 DEFINE_SVGELEMENT_TYPE_CASTS_WITH_FUNCTION(SVGGraphicsElement);
 
 } // namespace blink
 
 #endif // SVGGraphicsElement_h