<!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.d