gt;();
  var options = {&#39;audio&#39;: audio, &#39;video&#39;: video};
  _ensureGetUserMedia();
  this._getUserMedia(convertDartToNative_SerializedScriptValue(options),
      (stream) {
    completer.complete(stream);
  }, (error) {
    completer.completeError(error);
  });
  return completer.future;
}</code></pre>
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