Fix proguard flags.

Android.mk

@@ -17,5 +17,7 @@ LOCAL_STATIC_JAVA_LIBRARIES := android-common
 
 #LOCAL_SDK_VERSION := current
 
+LOCAL_PROGUARD_FLAGS := -include $(LOCAL_PATH)/proguard.flags
+
 include $(BUILD_PACKAGE)
 include $(LOCAL_PATH)/dictionary/Android.mk

proguard.flags

+-keep class com.android.inputmethod.latin.BinaryDictionary {
+  int mDictLength;
+}