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chromium/third_party/blink/perf_tests/bindings/sequence-conversion-array.html 

<!DOCTYPE html>
<html>
<body>
<script src="../resources/runner.js"></script>
<script>
let dataArray = [];
for (let i = 0; i < 100000; i++) {
  // We are interested in the conversion of JS arrays to C++ sequences, not in
  // the JS string to C++ string conversion, so just push empty strings into
  // the array.
  dataArray.push('');
}

PerfTestRunner.measureRunsPerSecond({
  description: "This benchmark measures the overhead of converting JavaScript objects into WebIDL sequences (fast path for arrays)",
  run: function() {
    new Blob(dataArray);
  }});
</script>
</body>
</html>