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/AudioTrack.h b/include/media/AudioTrack.h
index ef537f4..4475d4a 100644
--- a/include/media/AudioTrack.h
+++ b/include/media/AudioTrack.h
@@ -261,8 +261,8 @@
     /* set the send level for this track. An auxiliary effect should be attached
      * to the track with attachEffect(). Level must be <= 1.0.
      */
-            status_t    setSendLevel(float level);
-            void        getSendLevel(float* level);
+            status_t    setAuxEffectSendLevel(float level);
+            void        getAuxEffectSendLevel(float* level);
 
     /* set sample rate for this track, mostly used for games' sound effects
      */
@@ -479,6 +479,7 @@
     uint32_t                mUpdatePeriod;
     uint32_t                mFlags;
     int                     mSessionId;
+    int                     mAuxEffectId;
 };