1 files changed, 16 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/anonymous-iframe/resources/serviceworker-partitioning-helper.js b/testing/web-platform/tests/html/anonymous-iframe/resources/serviceworker-partitioning-helper.js
new file mode 100644
index 0000000000..288ad5954e
--- /dev/null
+++ b/testing/web-platform/tests/html/anonymous-iframe/resources/serviceworker-partitioning-helper.js
@@ -0,0 +1,16 @@
+let messages = {};
+let ports = {};
+
+self.addEventListener("message", e => {
+  const from = e.data.from;
+  const check = e.data.check;
+
+  if (from) {
+    messages[from] = true;
+    ports[from] = e.ports[0];
+  }
+
+  if (check) {
+    ports[check].postMessage(messages);
+  }
+});