Add TimeKeeperTest.

Change-Id: Id35823414f8552fd6820a5a559d6c9d54c7d6cb6
diff --git a/native/jni/NativeFileList.mk b/native/jni/NativeFileList.mk
index 5e66254..5511a9e 100644
--- a/native/jni/NativeFileList.mk
+++ b/native/jni/NativeFileList.mk
@@ -132,4 +132,5 @@
     suggest/policyimpl/dictionary/utils/sparse_table_test.cpp \
     suggest/policyimpl/dictionary/utils/trie_map_test.cpp \
     utils/autocorrection_threshold_utils_test.cpp \
-    utils/int_array_view_test.cpp
+    utils/int_array_view_test.cpp \
+    utils/time_keeper_test.cpp