we shouldn't take users so deep into the settings IA because it's easy
to feel lost in settings after clicking on a result without additional
context.
Bug: 143055215
Test: robotest & manual
Change-Id: I337cb5ead31e1e4e7bf9be78132e90630f83ee43
- Build a controller to generate/manage a list of preferences.
- Move some logics to the controller and add tests.
Test: manual
Test: make RunSettingsRoboTests -j
atest UniquePreferenceTest SettingsGatewayTest
Change-Id: Ia3d885cb8917c7d5498b87818e24b938f0d95dbb