chromium/chromecast/bindings/testdata/connector.html

<html>
    <head><title>bindings</title></head>
    <body>
        <script>
         var testChannel = cast.__platform__.PortConnector.bind('hello');
         testChannel.onmessage = function(msg) {
             testChannel.postMessage('ack ' + msg.data);
             return true;
         };

         // Send some messages before the channel can be established.
         testChannel.postMessage('early 1');
         testChannel.postMessage('early 2');
        </script>
    </body>
</html>