chromium/third_party/blink/web_tests/inspector-protocol/resources/worker-console-worker.js

self.onmessage = function(event)
{
    if (event.data.indexOf("throw") === 0)
        Promise.reject(event.data);
    else
        console.log(event.data);
    self.postMessage(event.data);
}
self.postMessage("ready");