ener
</li>
      <li><a href="polymer_app_layout.behaviors/Notification/close.html">close</a>
</li>
      <li>dispatchEvent
</li>
      <li>removeEventListener
</li>
    </ol>

  </div><!--/.sidebar-offcanvas-->

  <div class="col-xs-12 col-sm-9 col-md-6 main-content">

    <section class="multi-line-signature">
            <span class="returntype">Future&lt;String&gt;</span>
            <span class="name ">requestPermission</span>(
            )    </section>

    <section class="desc markdown">
    
     