Uses AudioFlinger to signal battery stats for audio.

Bug: 18177221
Change-Id: I704010c037cb99bb74b98798ee8e494fa8bdc875
diff --git a/services/audioflinger/Threads.h b/services/audioflinger/Threads.h
index 46ac300..114d43c 100644
--- a/services/audioflinger/Threads.h
+++ b/services/audioflinger/Threads.h
@@ -457,6 +457,7 @@
                 static const size_t     kLogSize = 4 * 1024;
                 sp<NBLog::Writer>       mNBLogWriter;
                 bool                    mSystemReady;
+                bool                    mNotifiedBatteryStart;
 };
 
 // --- PlaybackThread ---