Added support for audio sessions in MediaPlayer and AudioTrack.

Audio sessions are used to associate audio effects to particular instances (or groups) of MediaPlayers or AudioTracks.

Change-Id: Ib94eec43241cfcb416590f435ddce7ab39a07640
diff --git a/media/libmedia/AudioTrack.cpp b/media/libmedia/AudioTrack.cpp
index 2118f8f..0f2093a 100644
--- a/media/libmedia/AudioTrack.cpp
+++ b/media/libmedia/AudioTrack.cpp
@@ -92,7 +92,8 @@
     : mStatus(NO_INIT)
 {
     mStatus = set(streamType, sampleRate, format, channels,
-            frameCount, flags, cbf, user, notificationFrames, 0);
+            frameCount, flags, cbf, user, notificationFrames,
+            0, false, sessionId);
 }
 
 AudioTrack::AudioTrack(
@@ -109,7 +110,8 @@
     : mStatus(NO_INIT)
 {
     mStatus = set(streamType, sampleRate, format, channels,
-            0, flags, cbf, user, notificationFrames, sharedBuffer);
+            0, flags, cbf, user, notificationFrames,
+            sharedBuffer, false, sessionId);
 }
 
 AudioTrack::~AudioTrack()