1 files changed, 21 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/anonymous-iframe/resources/sharedworker-partitioning-helper.js b/testing/web-platform/tests/html/anonymous-iframe/resources/sharedworker-partitioning-helper.js
new file mode 100644
index 0000000000..8b416c33d7
--- /dev/null
+++ b/testing/web-platform/tests/html/anonymous-iframe/resources/sharedworker-partitioning-helper.js
@@ -0,0 +1,21 @@
+let messages = {};
+
+onconnect = function(e) {
+  let port = e.ports[0];
+
+  port.addEventListener('message', function(e) {
+    const action = e.data.action;
+    const from = e.data.from;
+
+    if (action === 'record') {
+      messages[from] = true;
+      port.postMessage({ack: from});
+    }
+
+    if (action === 'retrieve') {
+      port.postMessage({ack: from, messages: messages});
+    }
+  });
+
+  port.start();
+};