title: How to change font-family of toolbar title?
body: <p>I want to change font-family of my toolbar title to <code>sans-serif-smallcaps</code>. How do I do it?</p>
  
  <p>My <code>AppTheme</code> has parent <code>Theme.AppCompat.Light.DarkActionBar</code></p>
  
  <p>Edit: Toolbar XML:</p>
  
  <pre><code>    &lt;android.support.v7.widget.Toolbar
          android:id="@+id/toolbar"
          android:layout_width="match_parent"
          android:layout_height="?attr/actionBarSize"
          android:background="?attr/colorPrimary"
          app:popupTheme="@style/AppTheme.PopupOverlay" /&gt;
  </code></pre>