So the new password can be saved per caller's request.
This will remove the additional step to ask the user
to enter the new credential again and thus simplifying
the UI flow.
Bug: 271968977
Bug: 277561275
Test: atest SettingsUnitTests:SaveAndFinishWorkerTest
Test: atest ChooseLockPasswordTest
Change-Id: I20232619225b17edda0a72dad43b120d5a249203
* Extract common code of ChooseLockPassword.SaveAndFinishWorker and
ChooseLockPattern.SaveAndFinishWorker to the parent class.
* Make setters return this to make it easy to chain setter calls.
* Rename SaveChosenLockWorkerBase to SaveAndFinishWorker.
This will make the code changes in the next CL much easier.
Bug: 271968977
Bug: 277561275
Test: 1. Add screen lock (password/PIN/pattern) using Settings
2. check screen lock works correctly
Change-Id: I98acd25f2dd81ab4608cc6943e4f238070003c17
