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

Source/core/html/canvas/WebGLDepthTexture.cpp

 /*
  * 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 16 matching lines @@
 
 #include "core/html/canvas/WebGLDepthTexture.h"
 
 #include "core/platform/graphics/Extensions3D.h"
 
 namespace WebCore {
 
 WebGLDepthTexture::WebGLDepthTexture(WebGLRenderingContext* context)
     : WebGLExtension(context)
 {
+    ScriptWrappable::init(this);
     context->graphicsContext3D()->getExtensions()->ensureEnabled("GL_CHROMIUM_depth_texture");
 }
 
 WebGLDepthTexture::~WebGLDepthTexture()
 {
 }
 
 WebGLExtension::ExtensionName WebGLDepthTexture::getName() const
 {
     return WebGLDepthTextureName;
@@ skipping 11 matching lines @@
         || extensions->supports("GL_OES_depth_texture")
         || extensions->supports("GL_ARB_depth_texture");
 }
 
 const char* WebGLDepthTexture::getExtensionName()
 {
     return "WEBGL_depth_texture";
 }
 
 } // namespace WebCore