Fix: 177967926
Fix: 177968295
Fix: 177967925
Fix: 177968078
Test: Run robotest and apply the widget in Settings and see the ui
Change-Id: Ie854de96e5495fa564fb8a097ed4547bbd2b10c5
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