Oilpan: move SVG property hierarchy to the heap.

Source/core/rendering/svg/RenderSVGResourceFilter.h

Index: Source/core/rendering/svg/RenderSVGResourceFilter.h
diff --git a/Source/core/rendering/svg/RenderSVGResourceFilter.h b/Source/core/rendering/svg/RenderSVGResourceFilter.h
index d18d11457d3e726c87f796269b1f0b3f9cfbda90..2abe831943ec7c8002eac549e89547a080348ea2 100644
--- a/Source/core/rendering/svg/RenderSVGResourceFilter.h
+++ b/Source/core/rendering/svg/RenderSVGResourceFilter.h
@@ -31,21 +31,30 @@
 
 namespace blink {
 
-struct FilterData {
-    WTF_MAKE_FAST_ALLOCATED;
+class FilterData final : public NoBaseWillBeGarbageCollected<FilterData> {
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
     enum FilterDataState { PaintingSource, Built, CycleDetected };
 
-    FilterData()
-        : state(PaintingSource)
+    static PassOwnPtrWillBeRawPtr<FilterData> create()
     {
+        return adoptPtrWillBeNoop(new FilterData());
     }
 
-    RefPtr<SVGFilter> filter;
-    RefPtr<SVGFilterBuilder> builder;
+    void trace(Visitor*);
+
+    RefPtrWillBeMember<SVGFilter> filter;
+    RefPtrWillBeMember<SVGFilterBuilder> builder;
     FloatRect boundaries;
     FloatRect drawingRegion;
     FilterDataState state;
+
+private:
+    FilterData()
+        : state(PaintingSource)
+    {
+    }
+
 };
 
 class GraphicsContext;
@@ -53,7 +62,9 @@ class GraphicsContext;
 class RenderSVGResourceFilter final : public RenderSVGResourceContainer {
 public:
     explicit RenderSVGResourceFilter(SVGFilterElement*);
+
     virtual ~RenderSVGResourceFilter();
+    virtual void trace(Visitor*) override;
     virtual void destroy() override;
 
     virtual bool isChildAllowed(RenderObject*, RenderStyle*) const override;
@@ -69,7 +80,7 @@ public:
 
     FloatRect resourceBoundingBox(const RenderObject*);
 
-    PassRefPtr<SVGFilterBuilder> buildPrimitives(SVGFilter*);
+    PassRefPtrWillBeRawPtr<SVGFilterBuilder> buildPrimitives(SVGFilter*);
 
     SVGUnitTypes::SVGUnitType filterUnits() const { return toSVGFilterElement(element())->filterUnits()->currentValue()->enumValue(); }
     SVGUnitTypes::SVGUnitType primitiveUnits() const { return toSVGFilterElement(element())->primitiveUnits()->currentValue()->enumValue(); }
@@ -81,7 +92,7 @@ public:
 
     FloatRect drawingRegion(RenderObject*) const;
 private:
-    typedef HashMap<RenderObject*, OwnPtr<FilterData> > FilterMap;
+    typedef WillBeHeapHashMap<RawPtrWillBeMember<RenderObject>, OwnPtrWillBeMember<FilterData> > FilterMap;
     FilterMap m_filter;
 };