performance-user-timing-mark-feature-usage.html

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<script>
  const kUserFeatureNgOptimizedImage = 4775;
  function clearUseCounter() {
    internals.clearUseCounter(document, kUserFeatureNgOptimizedImage);
  }

  test(t => {
    t.add_cleanup(clearUseCounter);
    assert_false(internals.isUseCounted(document, kUserFeatureNgOptimizedImage),
      "mark_feature_usage corresponding WebFeature usage isn't counted initially");

    performance.mark('mark_feature_usage', {
      'detail': {
        'feature': 'NgOptimizedImage',
      }
    });
    assert_true(internals.isUseCounted(document, kUserFeatureNgOptimizedImage),
      "mark_feature_usage corresponding WebFeature usage was counted");
  }, 'performance.mark with mark_feature_usage ticks mapped WebFeature UseCounter');
</script>

chromium/third_party/blink/web_tests/wpt_internal/performance-timeline/performance-user-timing-mark-feature-usage.html