d8d03a8e1b added new methods to
InputMethodService.
Allowing IME developers to override some of these methods would introduce
unnecessary complexity. Making these methods final makes sure developers
cannot inject some unexpected behavior when called by system.
Bug: 73701052
Test: atest InputMethodServiceTest
Test: atest CtsInputMethodServiceHostTestCases
Change-Id: I1af4ed05a0b7306d840a21129e921a57b4a5fc33
4513699583