init: add an initializer for keychord_id_

Add unit test to ensure all POD types of Service are initialized.

Bug: 37855222
Test: Ensure bugreport is triggered via keychord properly.
Test: New unit tests
Change-Id: If2cfea15a74ab417a7b909a60c264cb8eb990de7
diff --git a/init/Android.mk b/init/Android.mk
index de3d076..537bbee 100644
--- a/init/Android.mk
+++ b/init/Android.mk
@@ -145,6 +145,7 @@
     init_parser_test.cpp \
     init_test.cpp \
     property_service_test.cpp \
+    service_test.cpp \
     util_test.cpp \
 
 LOCAL_SHARED_LIBRARIES += \