Keep a copy of most recent audio played

Change-Id: I6b2f97881c39998a2fae9ab79d669af6c0a37e94
diff --git a/services/audioflinger/Android.mk b/services/audioflinger/Android.mk
index 0d7f06a..4f59a8a 100644
--- a/services/audioflinger/Android.mk
+++ b/services/audioflinger/Android.mk
@@ -85,4 +85,8 @@
 # uncomment for systrace
 # LOCAL_CFLAGS += -DATRACE_TAG=ATRACE_TAG_AUDIO
 
+# uncomment for dumpsys to write most recent audio output to .wav file
+# 47.5 seconds at 44.1 kHz, 8 megabytes
+# LOCAL_CFLAGS += -DTEE_SINK_FRAMES=0x200000
+
 include $(BUILD_SHARED_LIBRARY)