title: how to resize the actionbar icon
body: <p>Hi I am trying to have an app icon on the action bar. For api level before 21 I am using Theme.Holo.Light and my app icon is set by default.
  But for v21 I am using Theme.Material.Light. By default there is no app icon in the actionbar so I am programatically setting the icon like this</p>
  
  <pre><code>    ActionBar actionbar = getActionBar();
      actionbar .setDisplayShowHomeEnabled(true);
      actionbar .setIcon(R.drawable.icon);
  </code></pre>
  
  <p>But with this approach my app icon is appearing bigger than it appeared with Theme.Holo.Light.</p>
  
  <p>How can I set the app icon in actionbar with Material design theme same as the icon that appeared in Theme.Material.Light?</p>