Oilpan: move SVG property hierarchy to the heap.

Source/core/rendering/style/StyleFilterData.h

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 #ifndef StyleFilterData_h
 #define StyleFilterData_h
 
 #include "platform/graphics/filters/FilterOperations.h"
+#include "platform/heap/Handle.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace blink {
 
-class StyleFilterData : public RefCounted<StyleFilterData> {
+// FIXME: Oilpan: resorting to RefCountedGarbageCollected<> here so as to support
+// DataRef<StyleFilterData> uses. Once/if DataRef<> is able to move away from
+// relying on RefPtr<>, switch to GarbageCollected<>.
+class StyleFilterData final : public RefCountedWillBeRefCountedGarbageCollected<StyleFilterData> {
 public:
-    static PassRefPtr<StyleFilterData> create() { return adoptRef(new StyleFilterData); }
-    PassRefPtr<StyleFilterData> copy() const { return adoptRef(new StyleFilterData(*this)); }
+    static PassRefPtrWillBeRawPtr<StyleFilterData> create()
+    {
+        return adoptRefWillBeNoop(new StyleFilterData);
+    }
+
+    PassRefPtrWillBeRawPtr<StyleFilterData> copy() const
+    {
+        return adoptRefWillBeNoop(new StyleFilterData(*this));
+    }
 
     bool operator==(const StyleFilterData&) const;
     bool operator!=(const StyleFilterData& o) const
     {
         return !(*this == o);
     }
 
+    void trace(Visitor* visitor)
+    {
+        visitor->trace(m_operations);
+    }
+
     FilterOperations m_operations;
 
 private:
     StyleFilterData();
-    StyleFilterData(const StyleFilterData&);
+    explicit StyleFilterData(const StyleFilterData&);
 };
 
 } // namespace blink
 
 
 #endif // StyleFilterData_h