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chromium/third_party/blink/perf_tests/layout/flexbox-column-nowrap.html 

<!DOCTYPE html>
<html>
<head>
<script src="../resources/runner.js"></script>
</head>
<body style="overflow-y: scroll">

<div id="flexbox" style="height: 400px; flex-direction: column; justify-content: center; align-items: center;">
    <div style="flex: 1 auto">1</div>
    <div style="flex: 2 auto">2 2</div>
    <div style="flex: 3 auto">3 3 3</div>
    <div style="flex: 4 auto">4 4 4 4</div>
    <div style="flex: 5 auto">5 5 5 5 5</div>
    <div style="flex: 6 auto">6 6 6 6 6 6</div>
    <div style="flex: 7 auto">7 7 7 7 7 7 7</div>
    <div style="flex: 8 auto">8 8 8 8 8 8 8 8</div>
    <div style="flex: 9 auto">9 9 9 9 9 9 9 9 9</div>
    <div style="flex: 10 auto">10 10 10 10 10 10 10 10 10</div>
</div>

</body>
<script>
function runTest()
{
    document.getElementById("flexbox").style.display = 'flex';
    PerfTestRunner.forceLayout();
    document.getElementById("flexbox").style.display = '';
    PerfTestRunner.forceLayout();
}

PerfTestRunner.measureRunsPerSecond({
    description: "Measures performance of flexbox with no wrapping (column).",
    run: runTest,
    done: function() {
        document.getElementById("flexbox").style.display = 'none';
    }
});
</script>
</html>