Add input pointers

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

...c/com/android/inputmethod/latin/ExpandableDictionary.java

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

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

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