1 files changed, 5 insertions, 1 deletions
diff --git a/testing/web-platform/tests/service-workers/service-worker/resources/resource-timing-worker.js b/testing/web-platform/tests/service-workers/service-worker/resources/resource-timing-worker.js
index 481a6536a..452876838 100644
--- a/testing/web-platform/tests/service-workers/service-worker/resources/resource-timing-worker.js
+++ b/testing/web-platform/tests/service-workers/service-worker/resources/resource-timing-worker.js
@@ -1,5 +1,9 @@
 self.addEventListener('fetch', function(event) {
     if (event.request.url.indexOf('dummy.js') != -1) {
-      event.respondWith(new Response());
+      event.respondWith(new Promise(resolve => {
+        // Slightly delay the response so we ensure we get a non-zero
+        // duration.
+        setTimeout(_ => resolve(new Response()), 100);
+      }));
     }
   });