    </span>
                  </dt>
        <dd>
           
                  
</dd>
        <dt id="mark" class="callable">
          <span class="name"><a href="../dart-html/Performance/mark.html">mark</a></span><span class="signature">(<wbr><span class="parameter" id="mark-param-markName"><span class="type-annotation"><a href="../dart-core/String-class.html">String</a></span> <span class="parameter-name">markName</span></span><wbr>)
            <span class="returntype parameter">&#8594; void</span>
    