Support language bar swich for InputMethodSubtype

...d/inputmethod/compat/InputMethodManagerCompatWrapper.java

...d/inputmethod/compat/InputMethodSubtypeCompatWrapper.java

...android/inputmethod/deprecated/LanguageSwitcherProxy.java

...tmethod/deprecated/languageswitcher/LanguageSwitcher.java

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

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

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