Switch and SwitchCompat are both CompoundButton.
Using CompoundButton in Java will helps migration in the future.
Bug: 306658427
Test: manual - check Settings pages
Change-Id: If2e08a9a9557ec66a3b31ef18cd2e15943098a59
To log Settings metrics, the MainSwitch extends MainSwitchBar and
replace the SwitchBar in SettingsActivity.
Bug: 175181773
Test: Run robotest and apply the widget in Settings and see the ui
Change-Id: I3add3702e9058ad9192b5172c7cf0e2ccfb55a70