public Builder mergeExecuteStepRequest(main.Messages.ExecuteStepRequest value) {
        if (executeStepRequestBuilder_ == null) {
          if (((bitField0_ & 0x00000080) == 0x00000080) &&
              executeStepRequest_ != main.Messages.ExecuteStepRequest.getDefaultInstance()) {
            executeStepRequest_ =
              main.Messages.ExecuteStepRequest.newBuilder(executeStepRequest_).mergeFrom(value).buildPartial();
          } else {
            executeStepRequest_ = value;
          }
          onChanged();
        } else {
          executeStepRequestBuilder_.mergeFrom(value);
        }
        bitField0_ |= 0x00000080;
        return this;
      }