Create present timestamp offset for SF

Change-Id: Ic6435cca06739f749c6041c0925ca235dcc7f51e
diff --git a/configstore/1.0/default/surfaceflinger.mk b/configstore/1.0/default/surfaceflinger.mk
index 8ee3686..d824072 100644
--- a/configstore/1.0/default/surfaceflinger.mk
+++ b/configstore/1.0/default/surfaceflinger.mk
@@ -29,3 +29,8 @@
     LOCAL_CFLAGS += -DHAS_HDR_DISPLAY
 endif
 
+ifneq ($(PRESENT_TIME_OFFSET_FROM_VSYNC_NS),)
+    LOCAL_CFLAGS += -DPRESENT_TIME_OFFSET_FROM_VSYNC_NS=$(PRESENT_TIME_OFFSET_FROM_VSYNC_NS)
+else
+    LOCAL_CFLAGS += -DPRESENT_TIME_OFFSET_FROM_VSYNC_NS=0
+endif