third_party/WebKit/LayoutTests/fast/workers/resources/termination-with-port-messages.js

   1 function echo(evt)
   2 {
   3     evt.target.postMessage(evt.data);
   4 }
   5
   6 onmessage = function(evt)
   7 {
   8     evt.ports[0].onmessage = echo;
   9     evt.ports[0].start();
  10 }