Use -Werror in frameworks/base

Bug: 66996870
Test: build with WITH_TIDY=1
Change-Id: Ibfe36a62d9a91b7df813b42e18dafaa58dc8b60d
diff --git a/vr/Android.mk b/vr/Android.mk
index 5b65d3f..73e9f23 100644
--- a/vr/Android.mk
+++ b/vr/Android.mk
@@ -18,6 +18,7 @@
 LOCAL_MODULE := libdvr_loader
 LOCAL_MODULE_OWNER := google
 LOCAL_SRC_FILES := dvr_library_loader.cpp
+LOCAL_CFLAGS := -Wall -Werror
 include $(BUILD_SHARED_LIBRARY)
 
 # Java platform library for vr stuff.