SafeBrowsing test for WebSocket connection from worker

chrome/test/data/safe_browsing/malware_websocket.html

 <title>Test whether a WebSocket connection triggers a SafeBrowsing interstitial</title>
 <script>
+const url = new URL(document.location.href);
+const type = url.searchParams.get('type');
 // Construct the WebSocket URL from the page URL. The server should not be
 // configured to accept a WebSocket handshake at this endpoint, or the "not
 // blocked" test will fail. A 404 error is perfect.
-const wsUrl = new URL('/safe_browsing/malware-ws', document.location.href);
+const wsUrl = new URL('/safe_browsing/malware-ws', url);
 wsUrl.protocol = 'ws';
-const ws = new WebSocket(wsUrl.href);
-// The "not blocked" test looks for this title change to verify that the request
-// has not been blocked.
-ws.onerror = () => { document.title = 'COMPLETED'; };
+
+function workerTest() {
+  const src = `
+const ws = new WebSocket('${wsUrl}');
+ws.onerror = () => {
+  postMessage('COMPLETED');
+};
+`;
+  const blob = new Blob([src]);
+  const srcUrl = URL.createObjectURL(blob);
+  const worker = new Worker(srcUrl);
+  worker.onmessage = signalComplete;
+}
+
+switch (type) {
+  case 'worker':
+    workerTest();
+    break;
+
+  default:
+    windowTest();
+    break;
+}
+
+function windowTest() {
+  const ws = new WebSocket(wsUrl.href);
+  ws.onerror = signalComplete;
+}
+
+function signalComplete() {
+  // The "not blocked" test looks for this title change to verify that the
+  // request has not been blocked.
+  document.title = 'COMPLETED';
+}
 </script>