Add unit test. Bug: 224724840 Test: make RunSettingsRoboTests ROBOTEST_FILTER=AppLocalePickerActivityTest Change-Id: Iabbf84d58d5c325b15d960d63aeda0f7ca7af00b
Bug: 223503670 Test: atest Change-Id: I0e92be43d661dd3bff19c3274d1572ef1f4e9c46