code: 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);
    }
  }
docs: Manages information about the device and the viewer.
  
  deviceParams indicates the parameters of the device to use (generally
  obtained from dpdb.getDeviceParams()). Can be null to mean no device
  params were found.