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/MediaPlayerInterface.h b/include/media/MediaPlayerInterface.h
index 8168dff..d4aa233 100644
--- a/include/media/MediaPlayerInterface.h
+++ b/include/media/MediaPlayerInterface.h
@@ -107,6 +107,7 @@
         virtual void        close() = 0;
 
         virtual status_t    setPlaybackRatePermille(int32_t rate) { return INVALID_OPERATION; }
+        virtual bool        needsTrailingPadding() { return true; }
     };
 
                         MediaPlayerBase() : mCookie(0), mNotify(0) {}