setTrackingOptions(options) {
    this.set(Property.TRACKING_OPTIONS, options);
  }
Set the tracking options.
See http://www.w3.org/TR/geolocation-API/#position-options.
@param {PositionOptions} options PositionOptions as defined by the
    [HTML5 Geolocation spec
    ](http://www.w3.org/TR/geolocation-API/#position_options_interface).
@observable
@api