SF: Disable FenceTracker from makefile

- Add tracing to the FenceTracker.
- Disable it by default with #ifdefs, it can be enabled in the
  makefile.

Bug 27882222

Change-Id: I640e028c4dc97b46e800a7f21cdb2cb6a4b4ff18
diff --git a/services/surfaceflinger/Android.mk b/services/surfaceflinger/Android.mk
index d0a0401..44a3334 100644
--- a/services/surfaceflinger/Android.mk
+++ b/services/surfaceflinger/Android.mk
@@ -40,7 +40,7 @@
 
 LOCAL_CFLAGS := -DLOG_TAG=\"SurfaceFlinger\"
 LOCAL_CFLAGS += -DGL_GLEXT_PROTOTYPES -DEGL_EGLEXT_PROTOTYPES
-
+#LOCAL_CFLAGS += -DENABLE_FENCE_TRACKING
 
 USE_HWC2 := false
 ifeq ($(USE_HWC2),true)