docs: public void addControllerType(GVRControllerType controllerType)
      {
          if (cursorControllerTypes == null)
          {
              cursorControllerTypes = new ArrayList<GVRControllerType>();
          }
          else if (cursorControllerTypes.contains(controllerType))
          {
              return;
          }
          cursorControllerTypes.add(controllerType);
      }