Introduce patriciaTrie to abstract traversing version 2 dictionary.

Bug: 6669677
Change-Id: Ifef72f3d7a7ba67c5232b98c7835485d72d7322d
diff --git a/native/jni/Android.mk b/native/jni/Android.mk
index d5df6b6..f89eea7 100644
--- a/native/jni/Android.mk
+++ b/native/jni/Android.mk
@@ -70,6 +70,7 @@
         proximity_info_state_utils.cpp) \
     suggest/core/policy/weighting.cpp \
     suggest/core/session/dic_traverse_session.cpp \
+    suggest/policyimpl/dictionary/patricia_trie_policy.cpp \
     suggest/policyimpl/gesture/gesture_suggest_policy_factory.cpp \
     $(addprefix suggest/policyimpl/typing/, \
         scoring_params.cpp \