commit db03de4e80dd311ecd16bbda8136350733a31024
author Fan Zhang <zhfan@google.com> Tue May 22 14:12:32 2018 -0700
committer Matthew Fritze <mfritze@google.com> Wed May 23 08:00:41 2018 -0700
tree 022910b343609515baaf3f9230bdc2b60ce1ef1b
parent 28dc3917a9767f27a8bd412cbff075ad6aade78c

Convert BatterySaverButton controller to Slice compatible.

- Update preference key to match the key defined in SettingsSlicesContract
- Model TwoStateButtonPreference similar to TwoStatePreference (add
  setChecked, isChecked method)
- Remove TwoStateButtonPreferenceController entirely because all methods
  are moved into Preference directly for better encapsulation.
- Make BatterySaverButtonPrefController direclty implement
  TogglePreferenceController. It was not possible before because the
  interface between TwoStateButtonPreferene is too different from
  TwoStatePreference.

Bug: 80106671
Test: robotests
Change-Id: Ib72807dcf1b36e959e08df8d80538c3f9f79b76d
Merged-In: Ib72807dcf1b36e959e08df8d80538c3f9f79b76d