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AudioPlayer (OpenSL ES) and MediaPlayer (OpenMAX AL) that play
 media from a URI or FD are implemented on top of an Android
 MediaPlayer. This CL implements requesting the current position
 from the underlying MediaPlayer object inside the event loop.
 At this stage, GetPosition cannot be called from inside a
 callback as the callback is made on the same thread that will
 process the asynchronous part of the GetPosition implementation.
Add test app for GetPosition.

Change-Id: Ife768bc40e37fc60cc19f6ba84bbe6cb06cc6590