Enable fsanitize integer in ui

Enables checks for undefined or suspicious integer behavior. If
suspicious behavior is detected, the process is aborted instead of
potentially resulting in a security bug.

Bug: 23834892
Change-Id: I9111bce2ebb36e045f4da1dbf78f90f04a0aa81c
diff --git a/libs/ui/Android.mk b/libs/ui/Android.mk
index 1ce8626..54ff741 100644
--- a/libs/ui/Android.mk
+++ b/libs/ui/Android.mk
@@ -17,6 +17,7 @@
 
 LOCAL_CLANG := true
 LOCAL_CPPFLAGS := -std=c++1y -Weverything -Werror
+LOCAL_SANITIZE := integer
 
 # The static constructors and destructors in this library have not been noted to
 # introduce significant overheads