title: AppBarLayout elevation change is delayed on appCompat v24.0.0
body: <p>In <strong>Appcompat v24.0.0</strong> causes rendering of <em>shadow/elevation</em> to <code>AppbarLayout</code> after Activity is visible. And a lag can easily be seen in shadow drawing to <code>AppbarLayout</code>.</p>
  
  <p>And this lag was not there in previous Appcompat library version.</p>
  
  <p>Tested using both <em>Appcompat v24.0.0</em> and <em>Appcompat v23.4.0</em>, shadow drawing clearly seen in the new version.</p>