1 files changed, 50 insertions, 0 deletions
diff --git a/testing/web-platform/tests/storage-access-api/resources/embedded_forwarder.js b/testing/web-platform/tests/storage-access-api/resources/embedded_forwarder.js
new file mode 100644
index 0000000000..c1e5e54443
--- /dev/null
+++ b/testing/web-platform/tests/storage-access-api/resources/embedded_forwarder.js
@@ -0,0 +1,50 @@
+"use strict";
+
+test_driver.set_test_context(window.top);
+
+function waitForMessage(timestamp) {
+  return new Promise(resolve => {
+    const listener = (event) => {
+      if (!timestamp || event.data.timestamp == timestamp) {
+        window.removeEventListener("message", listener);
+        resolve(event.data);
+      }
+    };
+    window.addEventListener("message", listener);
+  });
+}
+
+var iframe = document.createElement('iframe');
+const queryString = window.location.search;
+const urlParams = new URLSearchParams(queryString);
+iframe.src = urlParams.get("inner_url");
+document.body.appendChild(iframe);
+
+window.addEventListener("message", async (event) => {
+  function replyToParent(data) {
+    parent.postMessage(
+        {timestamp: event.data.timestamp, data}, "*");
+  }
+
+  if (!event.data["command"]) {
+    return;
+  }
+
+  switch (event.data["command"]) {
+    case "navigate_child":
+      iframe.onload = () => replyToParent(event.data.url);
+      iframe.src = event.data.url;
+      break;
+    case "reload":
+    case "navigate":
+      iframe.contentWindow.postMessage({timestamp, ...event.data}, "*");
+      break;
+    default:{
+      const timestamp = event.data.timestamp;
+      const p = waitForMessage(timestamp);
+      iframe.contentWindow.postMessage({timestamp, ...event.data}, "*");
+      replyToParent(await p.then(resp => resp.data));
+      break;
+    }
+  }
+});