Oilpan: move 2D Canvas and WebGL objects to the heap.

Source/core/html/canvas/WebGLRenderbuffer.h

 /*
  * Copyright (C) 2009 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
@@ skipping 18 matching lines @@
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/html/canvas/WebGLSharedObject.h"
 #include "wtf/PassRefPtr.h"
 
 namespace blink {
 
 class WebGLRenderbuffer FINAL : public WebGLSharedObject, public ScriptWrappable {
 public:
     virtual ~WebGLRenderbuffer();
 
-    static PassRefPtr<WebGLRenderbuffer> create(WebGLRenderingContextBase*);
+    static PassRefPtrWillBeRawPtr<WebGLRenderbuffer> create(WebGLRenderingContextBase*);
 
     void setInternalFormat(GLenum internalformat)
     {
         m_internalFormat = internalformat;
     }
     GLenum internalFormat() const { return m_internalFormat; }
 
     void setSize(GLsizei width, GLsizei height)
     {
         m_width = width;
         m_height = height;
     }
     GLsizei width() const { return m_width; }
     GLsizei height() const { return m_height; }
 
     bool hasEverBeenBound() const { return object() && m_hasEverBeenBound; }
 
     void setHasEverBeenBound() { m_hasEverBeenBound = true; }
 
-    void setEmulatedStencilBuffer(PassRefPtr<WebGLRenderbuffer> buffer) { m_emulatedStencilBuffer = buffer; }
+    void setEmulatedStencilBuffer(PassRefPtrWillBeRawPtr<WebGLRenderbuffer> buffer) { m_emulatedStencilBuffer = buffer; }
     WebGLRenderbuffer* emulatedStencilBuffer() const { return m_emulatedStencilBuffer.get(); }
     void deleteEmulatedStencilBuffer(blink::WebGraphicsContext3D* context3d);
 
+    virtual void trace(Visitor*) OVERRIDE;
+
 protected:
-    WebGLRenderbuffer(WebGLRenderingContextBase*);
+    explicit WebGLRenderbuffer(WebGLRenderingContextBase*);
 
     virtual void deleteObjectImpl(blink::WebGraphicsContext3D*, Platform3DObject) OVERRIDE;
 
 private:
     virtual bool isRenderbuffer() const OVERRIDE { return true; }
 
     GLenum m_internalFormat;
     GLsizei m_width, m_height;
 
     bool m_hasEverBeenBound;
 
-    RefPtr<WebGLRenderbuffer> m_emulatedStencilBuffer;
+    RefPtrWillBeMember<WebGLRenderbuffer> m_emulatedStencilBuffer;
 };
 
 } // namespace blink
 
 #endif // WebGLRenderbuffer_h