Add aidl_test_sentinel_searcher

We'll use this simple little program to test that our Java intent
dumps test success/failure to a file on disk.

Bug: 25159441
Test: integration test uses this successfully

Change-Id: I9b324133df7f69d4757b47e54bbd208892bf6217
diff --git a/Android.mk b/Android.mk
index 9711957..e1dbc67 100644
--- a/Android.mk
+++ b/Android.mk
@@ -149,6 +149,12 @@
 LOCAL_CFLAGS := $(aidl_cflags) -Wunused-parameter
 include $(BUILD_EXECUTABLE)
 
+include $(CLEAR_VARS)
+LOCAL_MODULE := aidl_test_sentinel_searcher
+LOCAL_SRC_FILES := tests/aidl_test_sentinel_searcher.cpp
+LOCAL_CFLAGS := $(aidl_cflags) -Wunused-parameter
+include $(BUILD_EXECUTABLE)
+
 
 # aidl on its own doesn't need the framework, but testing native/java
 # compatibility introduces java dependencies.