1 files changed, 37 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webmessaging/broadcastchannel/resources/worker.js b/testing/web-platform/tests/webmessaging/broadcastchannel/resources/worker.js
new file mode 100644
index 0000000000..ee2d51a254
--- /dev/null
+++ b/testing/web-platform/tests/webmessaging/broadcastchannel/resources/worker.js
@@ -0,0 +1,37 @@
+importScripts("/common/gc.js");
+
+var c;
+
+async function handler(e, reply) {
+  if (e.data.ping) {
+    c.postMessage(e.data.ping);
+    return;
+  }
+  if (e.data.blob) {
+    (() => {
+      c.postMessage({blob: new Blob(e.data.blob)});
+    })();
+    await garbageCollect();
+  }
+  c = new BroadcastChannel(e.data.channel);
+  let messages = [];
+  c.onmessage = e => {
+      if (e.data === 'ready') {
+        // Ignore any 'ready' messages from the other thread since there could
+        // be some race conditions between this BroadcastChannel instance
+        // being created / ready to receive messages and the message being sent.
+        return;
+      }
+      messages.push(e.data);
+      if (e.data == 'done')
+        reply(messages);
+    };
+  c.postMessage('from worker');
+}
+
+onmessage = e => handler(e, postMessage);
+
+onconnect = e => {
+  let port = e.ports[0];
+  port.onmessage = e => handler(e, msg => port.postMessage(msg));
+};