title: How to use setInterval/setTimeout in Dart SDK 0.4+
body: <p>I realised that in current Dart SDK version 0.4.1.0_r19425 methods like <code>setTimeout</code>, <code>setInterval</code>, <code>clearTimeout</code>, <code>clearInterval</code> aren't part of <a href="http://api.dartlang.org/docs/releases/latest/dart_html/Window.html"><code>Window</code></a> class any more and they all moved to <a href="http://api.dartlang.org/docs/releases/latest/dart_html/WorkerContext.html"><code>WorkerContext</code></a>.<br>
  Is there any documentation on how to use them now? Do I need to create a new instance of <code>WorkerContext</code> every time I want to use them?</p>