Oilpan: use Member<> for FilterEffect's filter reference.

Source/platform/graphics/filters/SkiaImageFilterBuilder.h

 /*
  * Copyright (C) 2012 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 disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 11 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef SkiaImageFilterBuilder_h
 #define SkiaImageFilterBuilder_h
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/FloatSize.h"
 #include "platform/graphics/ColorSpace.h"
+#include "platform/heap/Handle.h"
 #include "public/platform/WebFilterOperations.h"
 
 class SkImageFilter;
 
 namespace blink {
 class AffineTransform;
 class FilterEffect;
 class FilterOperations;
 class GraphicsContext;
 class SourceGraphic;
 
 class PLATFORM_EXPORT SkiaImageFilterBuilder {
+    STACK_ALLOCATED();
 public:
     SkiaImageFilterBuilder();
     explicit SkiaImageFilterBuilder(GraphicsContext*);
     ~SkiaImageFilterBuilder();
 
     PassRefPtr<SkImageFilter> build(FilterEffect*, ColorSpace, bool requiresPMColorValidation = true);
     void buildFilterOperations(const FilterOperations&, WebFilterOperations*);
     PassRefPtr<SkImageFilter> buildTransform(const AffineTransform&, SkImageFilter* input);
 
     PassRefPtr<SkImageFilter> transformColorSpace(
         SkImageFilter* input, ColorSpace srcColorSpace, ColorSpace dstColorSpace);
 
     void setCropOffset(const FloatSize& cropOffset) { m_cropOffset = cropOffset; };
     FloatSize cropOffset() { return m_cropOffset; }
 
     void setSourceGraphic(SourceGraphic* sourceGraphic) { m_sourceGraphic = sourceGraphic; }
     SourceGraphic* sourceGraphic() { return m_sourceGraphic; }
 
     GraphicsContext* context() { return m_context; }
 
 private:
     FloatSize m_cropOffset;
     GraphicsContext* m_context;
-    SourceGraphic* m_sourceGraphic;
+    RawPtrWillBeMember<SourceGraphic> m_sourceGraphic;
 };
 
 } // namespace blink
 
 #endif