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test/fixtures/wpt/performance-timeline/worker-with-performance-observer.html

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+<!doctype html>
+<html>
+<head>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<script>
+async_test(function(t) {
+  const worker = new Worker("resources/worker-with-performance-observer.js");
+  worker.onmessage = function(event) {
+    t.step(() => assert_equals(event.data, 'SUCCESS'));
+    t.done();
+  }
+}, 'Worker: Test Performance Observer inside a worker.');
+</script>
+</body>
+</html>