own">
      <p>Adds a subscription to this stream.</p>
<p>Returns a <a href="dart-async/StreamSubscription-class.html">StreamSubscription</a> which handles events from this stream using
the provided <code>onData</code>, <code>onError</code> and <code>onDone</code> handlers.
The handlers can be changed on the subscription, but they start out
as the provided functions.</p>
<p>On each data event from this stream, the subscriber's <code>onData</code> handler
is called. If <code>onData</code> is <code>null</code