Change native functions' interface for gesture

Change-Id: I106a858f0be7452dd89f425805a6f72aa88c3f65
diff --git a/native/jni/src/dictionary.cpp b/native/jni/src/dictionary.cpp
index e0b7f87..10ea9fe 100644
--- a/native/jni/src/dictionary.cpp
+++ b/native/jni/src/dictionary.cpp
@@ -44,7 +44,8 @@
             fullWordMultiplier, maxWordLength, maxWords, options);
     mBigramDictionary = new BigramDictionary(mDict + headerSize, maxWordLength);
     mGestureDecoder = new GestureDecoder(maxWordLength, maxWords);
-    mGestureDecoder->setDict(mUnigramDictionary, mBigramDictionary);
+    mGestureDecoder->setDict(mUnigramDictionary, mBigramDictionary,
+            mDict + headerSize /* dict root */, 0 /* root pos */);
 }
 
 Dictionary::~Dictionary() {