1 files changed, 7 insertions, 0 deletions
diff --git a/dom/tests/browser/perfmetrics/shared_worker.js b/dom/tests/browser/perfmetrics/shared_worker.js
new file mode 100644
index 0000000000..cb00bfb3eb
--- /dev/null
+++ b/dom/tests/browser/perfmetrics/shared_worker.js
@@ -0,0 +1,7 @@
+let onconnect = function (e) {
+  var port = e.ports[0];
+
+  port.onmessage = function (e) {
+    port.postMessage(e.data[0]);
+  };
+};