1 files changed, 5 insertions, 0 deletions
diff --git a/tests/wpt/web-platform-tests/longtask-timing/resources/utils.js b/tests/wpt/web-platform-tests/longtask-timing/resources/utils.js
index 7bb37bab32c..5498aa9a7b9 100644
--- a/tests/wpt/web-platform-tests/longtask-timing/resources/utils.js
+++ b/tests/wpt/web-platform-tests/longtask-timing/resources/utils.js
@@ -11,3 +11,8 @@ function checkLongTaskEntry(longtask, name = 'self') {
 function hasUnrelatedTaskName(taskName, expectedTaskName) {
   return (taskName !== expectedTaskName);
 }
+
+function busyWait() {
+  const deadline = performance.now() + 100;
+  while (performance.now() < deadline) {}
+}