Add format parameter to getTrackName() and track_t

Change-Id: Ia152a839014e235fbfb656104c15d7c1b456d02e
Signed-off-by: Andy Hung <hunga@google.com>
diff --git a/services/audioflinger/FastMixerState.cpp b/services/audioflinger/FastMixerState.cpp
index 8e6d0d4..3aa8dad 100644
--- a/services/audioflinger/FastMixerState.cpp
+++ b/services/audioflinger/FastMixerState.cpp
@@ -20,7 +20,7 @@
 
 FastTrack::FastTrack() :
     mBufferProvider(NULL), mVolumeProvider(NULL),
-    mChannelMask(AUDIO_CHANNEL_OUT_STEREO), mGeneration(0)
+    mChannelMask(AUDIO_CHANNEL_OUT_STEREO), mFormat(AUDIO_FORMAT_INVALID), mGeneration(0)
 {
 }