Make WebGL objects scriptwrappable so that binding integrity checks may be applied to them.

Source/core/html/canvas/WebGLRenderbuffer.cpp

 /*
  * 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 33 matching lines @@
 
 WebGLRenderbuffer::WebGLRenderbuffer(WebGLRenderingContext* ctx)
     : WebGLSharedObject(ctx)
     , m_internalFormat(GraphicsContext3D::RGBA4)
     , m_initialized(false)
     , m_width(0)
     , m_height(0)
     , m_isValid(true)
     , m_hasEverBeenBound(false)
 {
+    ScriptWrappable::init(this);
     setObject(ctx->graphicsContext3D()->createRenderbuffer());
 }
 
 void WebGLRenderbuffer::deleteObjectImpl(GraphicsContext3D* context3d, Platform3DObject object)
 {
     context3d->deleteRenderbuffer(object);
 }
 
 }