MediaStreamTrack-transfer-cross-agent-cluster.https.html

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This test has a WPT meta file that expects 2 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /mediacapture-streams/MediaStreamTrack-transfer-cross-agent-cluster.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset=utf-8>

<title>MediaStreamTrack cannot be transferred to another agent cluster</title>

<link rel="help" href="https://w3c.github.io/mediacapture-extensions/#transferable-mediastreamtrack">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/resources/testdriver.js"></script>

<script src="/resources/testdriver-vendor.js"></script>

<script src="/common/get-host-info.sub.js"></script>

<script src="permission-helper.js"></script>

<body>

<script>

const RECEIVER = '/mediacapture-streams/resources/cross-agent-cluster-receiver.html';

function appendIframe(t, origin) {

  const frame = document.createElement('iframe');

  t.add_cleanup(() => frame.remove());

  const loaded = new Promise(resolve => frame.onload = resolve);

  frame.src = origin + RECEIVER;

  document.body.append(frame);

  return loaded.then(() => frame);

function post(frame, value, transfer = []) {

  const result = new Promise(resolve => window.addEventListener('message', e => resolve(e.data), { once: true }));

  frame.contentWindow.postMessage(value, '*', transfer);

  return result;

async function createTransferable(t) {

  await setMediaPermission('granted', ['camera']);

  const stream = await navigator.mediaDevices.getUserMedia({ video: true });

  const track = stream.getVideoTracks()[0];

  t.add_cleanup(() => track.stop());

  return track;

promise_test(async t => {

  const frame = await appendIframe(t, get_host_info().HTTPS_NOTSAMESITE_ORIGIN);

  assert_equals(await post(frame, { value: 1 }), 'message');

}, 'A plain object can be posted to a cross-site iframe');

promise_test(async t => {

  const frame = await appendIframe(t, get_host_info().HTTPS_ORIGIN);

  const transferable = await createTransferable(t);

  assert_equals(await post(frame, transferable, [transferable]), 'message');

}, 'MediaStreamTrack can be transferred to a same-origin iframe');

promise_test(async t => {

  const frame = await appendIframe(t, get_host_info().HTTPS_NOTSAMESITE_ORIGIN);

  const transferable = await createTransferable(t);

  assert_equals(await post(frame, transferable, [transferable]), 'messageerror');

}, 'MediaStreamTrack cannot be transferred to a cross-site iframe');

</script>