class ChromeDesktopCapture extends ChromeApi {
 static final JsObject _desktopCapture = chrome['desktopCapture'];

 ChromeDesktopCapture._();

 bool get available => _desktopCapture != null;

 /**
  * Shows desktop media picker UI with the specified set of sources.
  * 
  * [sources] Set of sources that should be shown to the user.
  * 
  * [targetTab] Optional tab for which the stream is created. If not specified
  * then the resulting stream can be used only by the calling extension,
  * otherwise the stream can be used only by the specified tab. If the tab's
  * security origin changes before this function returns, the call may fail.
  * 
  * Returns:
  * An id that can be passed to cancelChooseDesktopMedia() in case the prompt
  * need to be canceled.
  */
 int chooseDesktopMedia(List<DesktopCaptureSourceType> sources, dynamic callback, [Tab targetTab]) {
   if (_desktopCapture == null) _throwNotAvailable();

   return _desktopCapture.callMethod('chooseDesktopMedia', [jsify(sources), jsify(targetTab), jsify(callback)]);
 }

 /**
  * Hides desktop media picker dialog shown by chooseDesktopMedia().
  * 
  * [desktopMediaRequestId] Id returned by chooseDesktopMedia()
  */
 void cancelChooseDesktopMedia(int desktopMediaRequestId) {
   if (_desktopCapture == null) _throwNotAvailable();

   _desktopCapture.callMethod('cancelChooseDesktopMedia', [desktopMediaRequestId]);
 }

 void _throwNotAvailable() {
   throw new UnsupportedError("'chrome.desktopCapture' is not available");
 }
}