chromium/third_party/blink/web_tests/http/tests/xmlhttprequest/workers/upload-onprogress-event.html

<!doctype html>
<html>
<body>
<p>Upload enough data to trigger upload events within the Worker.  If this test passes, there should be a single PASS below.</p>
<script src="resources/worker-create.js"></script>
<script src="resources/upload-onprogress-event.js"></script>
</body>
</html>