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

Source/core/html/canvas/OESStandardDerivatives.cpp

Index: Source/core/html/canvas/OESStandardDerivatives.cpp
diff --git a/Source/core/html/canvas/OESStandardDerivatives.cpp b/Source/core/html/canvas/OESStandardDerivatives.cpp
index 1228e9de7878f79b5c435149a7e43226007d2c55..988c878d34ed6ea0a2141cf6bb557bd90f62e8e0 100644
--- a/Source/core/html/canvas/OESStandardDerivatives.cpp
+++ b/Source/core/html/canvas/OESStandardDerivatives.cpp
@@ -33,6 +33,7 @@ namespace WebCore {
 OESStandardDerivatives::OESStandardDerivatives(WebGLRenderingContext* context)
     : WebGLExtension(context)
 {
+    ScriptWrappable::init(this);
     context->graphicsContext3D()->getExtensions()->ensureEnabled("GL_OES_standard_derivatives");
 }