title: remove padding around action bar left icon on Android 4.0+
body: <p>I want to remove the padding around the icon on the left in the standard android 4.0+ action bar. I'm setting the icon with:</p>
  
  <pre><code>getActionBar().setIcon(getResources().getDrawable(R.drawable.ic_action_myapp));
  </code></pre>
  
  <p>And I would like the icon to fill vertically the space, touching both top and bottom, similar to what soundcloud app does:</p>
  
  <p><img src="https://i.stack.imgur.com/inynO.png" width="200"></p>