code: public StopWatch stop( String tag, String message )
      {
          m_tag = tag;
          m_message = message;
          stop();
  
          return this;
      }
docs: Stops the StopWatch, assigns the tag and a free-form message.
  
  @param tag The tag to assign.
  @param message A free-form message that associates with this particular StopWatch.
  @return This StopWatch.