bionic: add tests for properties

(cherry picked from commit 37d9f75dde881a0ba1c1b3253b1be19d4096963d)

Change-Id: Iac00ce10a4272032a1cbdbc4204277d6876e3365
diff --git a/tests/Android.mk b/tests/Android.mk
index 875746d..c65d20c 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -31,6 +31,7 @@
 benchmark_src_files = \
     benchmark_main.cpp \
     math_benchmark.cpp \
+    property_benchmark.cpp \
     string_benchmark.cpp \
     time_benchmark.cpp \
 
@@ -78,6 +79,7 @@
     string_test.cpp \
     strings_test.cpp \
     stubs_test.cpp \
+    system_properties_test.cpp \
     time_test.cpp \
     unistd_test.cpp \