Add Android*.mk files to additional dependencies

Bug: 17548097
Change-Id: Ie0d9c8f33459320008f561217c54eba42d283b47
diff --git a/tests/Android.mk b/tests/Android.mk
index 2acb047..d5fb5cf 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -390,5 +390,7 @@
 
 endif # linux-x86
 
+LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk $(LOCAL_PATH)/Android.build.mk
+
 include $(call first-makefiles-under,$(LOCAL_PATH))
 endif # !BUILD_TINY_ANDROID