static v8::Handle<v8::Value> webkitClearMarksCallback(const v8::Arguments& args)
{
    Performance* imp = V8Performance::toNative(args.Holder());
    V8TRYCATCH_FOR_V8STRINGRESOURCE(V8StringResource<>, markName, MAYBE_MISSING_PARAMETER(args, 0, DefaultIsNullString));
    imp->webkitClearMarks(markName);
    return v8Undefined();
}