code: private void expandBoundingBoxMarkers(BoundingBox boundingBox,
                                            List<Marker> markers) {
          for (Marker marker : markers) {
              expandBoundingBox(boundingBox, marker.getPosition());
          }
      }
docs: Expand the bounding box by the markers
  
  @param boundingBox bounding box
  @param markers     list of markers