Add audio tag to systrace

Change-Id: I4a558c43e4ccd81a4ed94684c5fad6b3c486bd14
diff --git a/include/utils/Trace.h b/include/utils/Trace.h
index 032af1b..62f5d6b 100644
--- a/include/utils/Trace.h
+++ b/include/utils/Trace.h
@@ -49,7 +49,8 @@
 #define ATRACE_TAG_WINDOW_MANAGER   (1<<5)
 #define ATRACE_TAG_ACTIVITY_MANAGER (1<<6)
 #define ATRACE_TAG_SYNC_MANAGER     (1<<7)
-#define ATRACE_TAG_LAST             ATRACE_TAG_SYNC_MANAGER
+#define ATRACE_TAG_AUDIO            (1<<8)
+#define ATRACE_TAG_LAST             ATRACE_TAG_AUDIO
 
 #define ATRACE_TAG_VALID_MASK ((ATRACE_TAG_LAST - 1) | ATRACE_TAG_LAST)