1 files changed, 37 insertions, 0 deletions
diff --git a/testing/web-platform/tests/IndexedDB/resources/cross-origin-helper-frame.html b/testing/web-platform/tests/IndexedDB/resources/cross-origin-helper-frame.html
new file mode 100644
index 0000000000..997c5a2b72
--- /dev/null
+++ b/testing/web-platform/tests/IndexedDB/resources/cross-origin-helper-frame.html
@@ -0,0 +1,37 @@
+<!doctype html>
+<meta charset="utf8">
+<title>Performs IndexedDB tasks in response to postMessage</title>
+<script>
+'use strict';
+
+self.addEventListener('message', async event => {
+  const action = event.data.action;
+  let response = null;
+  switch(action) {
+    case 'get-database-names': {
+      const dbInfos = await self.indexedDB.databases();
+      response = dbInfos.map(dbInfo => dbInfo.name);
+      break;
+    }
+
+    case 'delete-database': {
+      const dbName = event.data.name;
+      await new Promise((resolve, reject) => {
+        const request = indexedDB.deleteDatabase(dbName);
+        request.onsuccess = resolve;
+        request.onerror = reject;
+      });
+      response = true;
+      break;
+    }
+  }
+  event.source.postMessage({ action, response }, event.origin);
+  window.close();
+});
+
+// Make up for the fact that the opener of a cross-origin window has no way of
+// knowing when the window finishes loading.
+if (window.opener !== null) {
+  window.opener.postMessage({ action: null, response: 'ready' }, '*');
+}
+</script>