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-rw-r--r--testing/web-platform/tests/FileAPI/url/resources/revoke-helper.js9
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');
+});