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chromium/third_party/blink/perf_tests/base64/btoa.html 

<!DOCTYPE html>
<html>
<body>
<script src="../resources/runner.js"></script>
<script>
var longStr = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
for (var i = 0; i < 15; i++)
  longStr = longStr + longStr;
var binary = atob(longStr);

PerfTestRunner.measureRunsPerSecond({
description: "This benchmark covers `btoa`.",
  setup: function() {},
  run: function() {
    btoa(binary);
  }
});
</script>
</body>
</html>