public Builder addNestedType(
          com.google.protobuf.DescriptorProtos.DescriptorProto.Builder builderForValue) {
        if (nestedTypeBuilder_ == null) {
          ensureNestedTypeIsMutable();
          nestedType_.add(builderForValue.build());
          onChanged();
        } else {
          nestedTypeBuilder_.addMessage(builderForValue.build());
        }
        return this;
      }