bindings: Adds virtual ScriptWrappable::wrap method.

Source/bindings/templates/interface.h

Index: Source/bindings/templates/interface.h
diff --git a/Source/bindings/templates/interface.h b/Source/bindings/templates/interface.h
index e84950de83f4ba5fdc448c6d053a69bad9949cca..208a6a513ab64718e87ae065f8daaefec743d59d 100644
--- a/Source/bindings/templates/interface.h
+++ b/Source/bindings/templates/interface.h
@@ -220,7 +220,12 @@ inline v8::Handle<v8::Value> toV8({{cpp_class}}* impl, v8::Handle<v8::Object> cr
     v8::Handle<v8::Value> wrapper = DOMDataStore::getWrapper<{{v8_class}}>(impl, isolate);
     if (!wrapper.IsEmpty())
         return wrapper;
+
+{% if is_script_wrappable %}
+    return impl->wrap(creationContext, isolate);
+{% else %}
     return wrap(impl, creationContext, isolate);
+{% endif %}
 }
 
 template<typename CallbackInfo>