docs: function DeviceInfo(deviceParams, additionalViewers) {
    this.viewer = Viewers.CardboardV2;
    this.updateDeviceParams(deviceParams);
    this.distortion = new Distortion(this.viewer.distortionCoefficients);
    for (var i = 0; i < additionalViewers.length; i++) {
      var viewer = additionalViewers[i];
      Viewers[viewer.id] = new CardboardViewer(viewer);
    }
  }