code: public TemplatizedType createTemplatizedType(ObjectType baseType, JSType... templatizedTypes) {
      return createTemplatizedType(baseType, ImmutableList.copyOf(templatizedTypes));
    }
docs: Creates a templatized instance of the specified type.  Only ObjectTypes
  can currently be templatized; extend the logic in this function when
  more types can be templatized.
  @param baseType the type to be templatized.
  @param templatizedTypes a list of the template JSTypes. Will be matched by
  list order to the template keys on the base type.