1 files changed, 9 insertions, 0 deletions
diff --git a/testing/web-platform/tests/FileAPI/url/resources/revoke-helper.js b/testing/web-platform/tests/FileAPI/url/resources/revoke-helper.js
new file mode 100644
index 0000000000..c3e05b64b1
--- /dev/null
+++ b/testing/web-platform/tests/FileAPI/url/resources/revoke-helper.js
@@ -0,0 +1,9 @@
+self.addEventListener('message', e => {
+  URL.revokeObjectURL(e.data.url);
+  // Registering a new object URL will make absolutely sure that the revocation
+  // has propagated. Without this at least in chrome it is possible for the
+  // below postMessage to arrive at its destination before the revocation has
+  // been fully processed.
+  URL.createObjectURL(new Blob([]));
+  self.postMessage('revoked');
+});