third_party/WebKit/LayoutTests/http/tests/security/cors-rfc1918/resources/post-addressspace-from-worker.html

<script>
    var w = new Worker("/security/cors-rfc1918/resources/post-addressspace-to-owner.js");
    w.onmessage = function (e) {
        window.parent.postMessage(e.data, "*");
    }
    w.postMessage("go");
</script>