  <dt id="now" class="callable">
          <span class="name"><a href="../dart-html/Performance/now.html">now</a></span><span class="signature">(<wbr>)
            <span class="returntype parameter">&#8594; <a href="../dart-core/double-class.html">double</a></span>
          </span>
                  </dt>
        <dd>
           
                  
</dd>
        <dt id="setResourceTimingBufferSize" class="callable">
          <span class="name"><a href="../dart-html/Performance/setResourceTimingBufferSize.