MainSwitchPreference should synchronize the switch state of
MainSwitchBar.
Fix: 187391143
Test: robotest and see the UI
Change-Id: Ifa3d21f7ce3ba6bdcfa3c254b2aa1a7668618829
Based on our ux spec, we create this widget to
let everyone can follow up our spec easily.
Bug: 175181773
Test: Run robotest and apply this widget in Settings and see the ui
Change-Id: I4ea5f38c44aacfeb2c8dbe4a7d31159712f95441