Basic binary event-log helpers

EventLog can be used from SurfaceFlinger to log jank
statistics events to the binary event log.

Change-Id: If0fbbe7d7111f10957697166d37fd0c3418109bb
diff --git a/services/surfaceflinger/Android.mk b/services/surfaceflinger/Android.mk
index 71b235a..f2051dd 100644
--- a/services/surfaceflinger/Android.mk
+++ b/services/surfaceflinger/Android.mk
@@ -18,6 +18,8 @@
     DisplayHardware/HWComposer.cpp \
     DisplayHardware/PowerHAL.cpp \
     DisplayHardware/VirtualDisplaySurface.cpp \
+    EventLog/EventLogTags.logtags \
+    EventLog/EventLog.cpp
 
 LOCAL_CFLAGS:= -DLOG_TAG=\"SurfaceFlinger\"
 LOCAL_CFLAGS += -DGL_GLEXT_PROTOTYPES -DEGL_EGLEXT_PROTOTYPES