1 files changed, 4 insertions, 0 deletions
diff --git a/testing/web-platform/tests/FileAPI/url/resources/create-helper.js b/testing/web-platform/tests/FileAPI/url/resources/create-helper.js
new file mode 100644
index 0000000000..e6344f700c
--- /dev/null
+++ b/testing/web-platform/tests/FileAPI/url/resources/create-helper.js
@@ -0,0 +1,4 @@
+self.addEventListener('message', e => {
+  let url = URL.createObjectURL(e.data.blob);
+  self.postMessage({url: url});
+});