Add proximity info to native

java/src/com/android/inputmethod/keyboard/Keyboard.java

java/src/com/android/inputmethod/keyboard/KeyboardView.java

java/src/com/android/inputmethod/keyboard/ProximityInfo.java

java/src/com/android/inputmethod/latin/BinaryDictionary.java

java/src/com/android/inputmethod/latin/LatinIME.java

java/src/com/android/inputmethod/latin/WordComposer.java

native/Android.mk

...ve/jni/com_android_inputmethod_keyboard_ProximityInfo.cpp

native/jni/com_android_inputmethod_keyboard_ProximityInfo.h

...ve/jni/com_android_inputmethod_latin_BinaryDictionary.cpp

native/jni/com_android_inputmethod_latin_BinaryDictionary.h

native/jni/onload.cpp

native/src/defines.h

native/src/dictionary.cpp

native/src/dictionary.h

native/src/proximity_info.cpp

native/src/proximity_info.h

native/src/unigram_dictionary.cpp

native/src/unigram_dictionary.h

tests/src/com/android/inputmethod/latin/SuggestHelper.java