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async function referrer_test(expected, uid) {
const bc = new PrerenderChannel('prerender-channel', uid);
const gotMessage = new Promise(resolve => {
bc.addEventListener('message', e => {
resolve(e.data);
}, {once: true});
});
// Start prerendering a page that will echo its referrer.
startPrerendering(`resources/echo-referrer.py?uid=${uid}`);
const result = await gotMessage;
assert_equals(result.referrer, expected, 'referrer');
}