code: public void addControllerType(GVRControllerType controllerType)
      {
          if (cursorControllerTypes == null)
          {
              cursorControllerTypes = new ArrayList<GVRControllerType>();
          }
          else if (cursorControllerTypes.contains(controllerType))
          {
              return;
          }
          cursorControllerTypes.add(controllerType);
      }
docs: Enable the use of the given controller type by
  adding it to the cursor controller types list.
  @param controllerType GVRControllerType to add to the list