docs: public static ServerServiceDefinition intercept(ServerServiceDefinition serviceDef,
                                                    List<? extends ServerInterceptor> interceptors) {
      Preconditions.checkNotNull(serviceDef, "serviceDef");
      if (interceptors.isEmpty()) {
        return serviceDef;
      }
      ServerServiceDefinition.Builder serviceDefBuilder
          = ServerServiceDefinition.builder(serviceDef.getServiceDescriptor());
      for (ServerMethodDefinition<?, ?> method : serviceDef.getMethods()) {
        wrapAndAddMethod(serviceDefBuilder, method, interceptors);
      }
      return serviceDefBuilder.build();
    }