Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var a = [],
        canvas = document.createElement("canvas"),
        context = canvas.getContext("2d");
    canvas.width = 100;
    canvas.height = 100;
  };

  Benchmark.prototype.teardown = function() {
    console.log(a);
  };
</script>

Test runner

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a.push(context.getImageData(0, 0, 100, 100));

context.getImageData(0, 0, 100, 100);

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