public Builder addService(
          com.google.protobuf.DescriptorProtos.ServiceDescriptorProto.Builder builderForValue) {
        if (serviceBuilder_ == null) {
          ensureServiceIsMutable();
          service_.add(builderForValue.build());
          onChanged();
        } else {
          serviceBuilder_.addMessage(builderForValue.build());
        }
        return this;
      }