Added support for auxiliary audio effects to AudioTrack and MediaPlayer.

Added methods to AudioTrack and MediaPlayer java classes to enable use of
auxiliary audio effects. The effect can be attached and detached by specifying its
ID and the send level controlled.

Change-Id: Ie74ff54a453096a742688476f612ce355543b6f3
diff --git a/include/media/mediaplayer.h b/include/media/mediaplayer.h
index 4963f73..207191d 100644
--- a/include/media/mediaplayer.h
+++ b/include/media/mediaplayer.h
@@ -173,6 +173,8 @@
             status_t        resume();
             status_t        setAudioSessionId(int sessionId);
             int             getAudioSessionId();
+            status_t        setAuxEffectSendLevel(float level);
+            status_t        attachAuxEffect(int effectId);
 private:
             void            clear_l();
             status_t        seekTo_l(int msec);
@@ -200,6 +202,7 @@
     int                         mVideoWidth;
     int                         mVideoHeight;
     int                         mAudioSessionId;
+    float                       mSendLevel;
 };
 
 }; // namespace android