title: How or where to specify omx decoder supports tunneling
body: <p>The BSP supports tunneling of Hw accelerated codec.
  Android uses <code>feature-tunneled-playback</code> to check if tunneling is supported.
  If yes It will try to configure tunneling.
  How to implement or specify the android extension <code>OMX.google.android.index.configureVideoTunnelMode</code></p>
  
  <p><a href="http://androidxref.com/5.0.0_r2/xref/frameworks/native/include/media/hardware/HardwareAPI.h#220" rel="noreferrer">It</a> just says for tunneled playback support the extension should be supported. How to expose this extension so that android will assume the tunneling is supported ?</p>