title: How can I add a shadow to bottom sheet view?
body: <p>As of now, with the official bottom sheet component from the Android design library implemented the top edge doesn't show a shadow. But for what I've seen in various mockups and in the Material Design specs, the bottom sheet include a discrete shadow of some sort.</p>
  
  <p>I think the shadow would help distant the bottom sheet from the main layout, especially if there's a peek value set and/or the bottom sheet is always visible. Otherwise it just will blend together with the main layout and its items.</p>
  
  <p>I've tried both <code>ViewCompat.setElevation(bottomSheet, 5);</code> and setting <code>android:elevation="5dp"</code> to the view in the XML, without success.</p>
  
  <p><a href="https://i.stack.imgur.com/eWpb3.png" rel="noreferrer"><img src="https://i.stack.imgur.com/eWpb3.png" alt="Bottom sheet example from Material Design specs"></a></p>