Merge "[ML7] Have multiple DictionaryGroup instances in facilitator"

.../com/android/inputmethod/latin/DictionaryFacilitator.java

...roid/inputmethod/latin/DictionaryFacilitatorLruCache.java

...android/inputmethod/latin/ExpandableBinaryDictionary.java

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

.../latin/PersonalizationHelperForDictionaryFacilitator.java

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

...utmethod/latin/spellcheck/AndroidSpellCheckerService.java