Oilpan: move SVG property hierarchy to the heap.

Source/platform/graphics/filters/ReferenceFilter.cpp

 /*
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2013 Google 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
@@ skipping 25 matching lines @@
 #include "platform/graphics/filters/SourceGraphic.h"
 
 namespace blink {
 
 ReferenceFilter::ReferenceFilter(float scale)
     : Filter(scale)
     , m_sourceGraphic(SourceGraphic::create(this))
 {
 }
 
-void ReferenceFilter::setLastEffect(PassRefPtr<FilterEffect> effect)
-{
-    m_lastEffect = effect;
-}
-
 ReferenceFilter::~ReferenceFilter()
 {
 }
 
+void ReferenceFilter::trace(Visitor* visitor)
+{
+    visitor->trace(m_sourceGraphic);
+    visitor->trace(m_lastEffect);
+    Filter::trace(visitor);
+}
+
+void ReferenceFilter::setLastEffect(PassRefPtrWillBeRawPtr<FilterEffect> effect)
+{
+    m_lastEffect = effect;
+}
+
 } // namespace blink