Allow media.codec and media.extractor to specify two policy files.

Bug: Bug: 34723744
Test: Unit tests.
Test: media.codec, media.extractor start, have Seccomp.
Test: cat /proc/`pgrep .codec`/status | grep Seccomp
      Seccomp:    2
Test: cat /proc/`pgrep .extractor`/status | grep Seccomp
      Seccomp:    2
Change-Id: If5c3dcc934f5d76bd32859b2f7b7ecb772a56303
diff --git a/services/minijail/Android.mk b/services/minijail/Android.mk
index 836fad3..3e63f97 100644
--- a/services/minijail/Android.mk
+++ b/services/minijail/Android.mk
@@ -7,3 +7,11 @@
 LOCAL_SHARED_LIBRARIES := libbase libminijail
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)
 include $(BUILD_SHARED_LIBRARY)
+
+
+# Unit tests.
+include $(CLEAR_VARS)
+LOCAL_MODULE := libavservices_minijail_unittest
+LOCAL_SRC_FILES := minijail.cpp av_services_minijail_unittest.cpp
+LOCAL_SHARED_LIBRARIES := libbase libminijail
+include $(BUILD_NATIVE_TEST)