Merge "Predefined keyboard layouts are configurable via XML resource"

java/res/values/donottranslate.xml

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

.../android/inputmethod/latin/AdditionalSubtypeSettings.java

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

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

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