Gapless playback, step 1.

Currently able to play Ogg Vorbis, PCM WAV and other lossless files seamlessly
by reusing the initial AudioTrack for subsequent players.

Change-Id: Ie7cf6b9076bdf4f9211574456d192c02c04fecc7
diff --git a/include/media/IMediaPlayer.h b/include/media/IMediaPlayer.h
index 39d58ab..00facc5 100644
--- a/include/media/IMediaPlayer.h
+++ b/include/media/IMediaPlayer.h
@@ -64,6 +64,7 @@
     virtual status_t        setParameter(int key, const Parcel& request) = 0;
     virtual status_t        getParameter(int key, Parcel* reply) = 0;
     virtual status_t        setRetransmitEndpoint(const struct sockaddr_in* endpoint) = 0;
+    virtual status_t        setNextPlayer(const sp<IMediaPlayer>& next) = 0;
 
     // Invoke a generic method on the player by using opaque parcels
     // for the request and reply.