Oilpan: move SVG property hierarchy to the heap.

Source/core/rendering/svg/RenderSVGResourcePattern.h

Index: Source/core/rendering/svg/RenderSVGResourcePattern.h
diff --git a/Source/core/rendering/svg/RenderSVGResourcePattern.h b/Source/core/rendering/svg/RenderSVGResourcePattern.h
index 93afeff5f7e191773ddafbef6f3a300ffda82fad..ffabd7433d651a4609026c04e26f49951ccc4ee5 100644
--- a/Source/core/rendering/svg/RenderSVGResourcePattern.h
+++ b/Source/core/rendering/svg/RenderSVGResourcePattern.h
@@ -25,6 +25,7 @@
 #include "core/rendering/svg/RenderSVGResourcePaintServer.h"
 #include "core/svg/PatternAttributes.h"
 
+#include "platform/heap/Handle.h"
 #include "wtf/HashMap.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/RefPtr.h"
@@ -51,6 +52,8 @@ public:
     static const RenderSVGResourceType s_resourceType = PatternResourceType;
     virtual RenderSVGResourceType resourceType() const override { return s_resourceType; }
 
+    virtual void trace(Visitor*) override;
+
 private:
     PassOwnPtr<PatternData> buildPatternData(const RenderObject&);
     PassRefPtr<DisplayList> asDisplayList(const FloatRect& tileBounds, const AffineTransform&) const;