
            <span class="name ">addRetained</span>
(<wbr><span class="parameter" id="addRetained-param-retainedLayer"><span class="type-annotation"><a href="dart-ui/EngineLayer-class.html">EngineLayer</a></span> <span class="parameter-name">retainedLayer</span></span>)
      
    </section>
    <section class="desc markdown">
      <p>Add a retained engine layer subtree from previous frames.</p>
<p>All the engine layers that are in the subtree of the retained layer will
be automatically appended to the cur