Oilpan: move SVG property hierarchy to the heap.

Source/platform/graphics/filters/Filter.h

 /*
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2013 Google Inc. 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.
  *
  * 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 Filter_h
 #define Filter_h
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/FloatPoint3D.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/IntRect.h"
+#include "platform/heap/Handle.h"
 #include "wtf/RefCounted.h"
 
 namespace blink {
 
-class PLATFORM_EXPORT Filter : public RefCounted<Filter> {
+class PLATFORM_EXPORT Filter : public RefCountedWillBeGarbageCollectedFinalized<Filter> {
 public:
-    Filter(float scale)
-    : m_scale(scale) { }
     virtual ~Filter() { }
+    virtual void trace(Visitor*) { }
 
     float scale() const { return m_scale; }
     FloatRect mapLocalRectToAbsoluteRect(const FloatRect& rect) const { FloatRect result(rect); result.scale(m_scale); return result; }
     FloatRect mapAbsoluteRectToLocalRect(const FloatRect& rect) const { FloatRect result(rect); result.scale(1.0f / m_scale); return result; }
     virtual float applyHorizontalScale(float value) const { return m_scale * value; }
     virtual float applyVerticalScale(float value) const { return m_scale * value; }
 
     virtual FloatPoint3D resolve3dPoint(const FloatPoint3D& point) const { return point; }
 
     virtual IntRect sourceImageRect() const = 0;
 
     FloatRect absoluteFilterRegion() const { return m_absoluteFilterRegion; }
 
     FloatRect filterRegion() const { return m_filterRegion; }
     void setFilterRegion(const FloatRect& rect)
     {
         m_filterRegion = rect;
         m_absoluteFilterRegion = rect;
         m_absoluteFilterRegion.scale(m_scale);
     }
 
+protected:
+    explicit Filter(float scale)
+        : m_scale(scale)
+    {
+    }
+
 private:
     float m_scale;
     FloatRect m_absoluteFilterRegion;
     FloatRect m_filterRegion;
 };
 
 } // namespace blink
 
 #endif // Filter_h