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chromium/third_party/blink/web_tests/external/wpt/workers/interfaces/DedicatedWorkerGlobalScope/postMessage/structured-clone-imagedata.html 

<!doctype html>
<title>structured clone of ImageData</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
(async_test()).step(function() {
  var worker = new Worker('structured-clone-imagedata.js');
  var ctx = document.createElement('canvas').getContext('2d');
  var imagedata = ctx.getImageData(0, 0, 300, 150);
  worker.postMessage(imagedata);
  worker.onmessage = this.step_func(function(e) {
    assert_equals(''+e.data, '[object ImageData]');
    assert_equals(e.data.data[0], 128);
    this.done();
  });
});
</script>