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chromium/third_party/blink/web_tests/external/wpt/workers/semantics/reporting-errors/004.html 

<!doctype html>
<title>shared worker in two documents and window.onerror</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<script>
setup({allow_uncaught_exception:true});
var t = async_test(function() {
  window.onerror = this.step_func(function(a) {
    assert_unreached('(outer) window.onerror invoked: ' + a);
  });
  var worker = new SharedWorker('004.js', '');
  worker.addEventListener('error', this.step_func(function(e) {
    assert_unreached('(outer) error on worker');
  }), false);
  worker.port.addEventListener('error', this.step_func(function(e) {
    assert_unreached('(outer) error on port');
  }), false);
  worker.port.onmessage = this.step_func(function(e) {
    assert_equals(e.data, 1);
    var iframe = document.createElement('iframe');
    iframe.src = '004-1.html';
    document.body.appendChild(iframe);
  });
});
</script>