title: style Toolbar for using with bottom app bar
body: <p>How to style Toolbar in <a href="https://material.io/design/components/app-bars-bottom.html" rel="nofollow noreferrer">this style</a> as shown in Material Guidelines for Bottom App Bar?</p>
  
  <p>It's white, has no elevation, has more title top padding than usual etc. I couldn't find any specs for it in Material Guidelines or any theme references in <a href="https://github.com/material-components/material-components-android/" rel="nofollow noreferrer">material-components-android</a>.</p>
  
  <p>Screenshot:
  <a href="https://i.stack.imgur.com/1ZcAJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1ZcAJ.png" alt="material design guidelines "></a></p>