Settings: Forward port Change behavior when back pressed in PerformanceSettings

When back key pressed, finish this activity if user does NOT accept 'Ok'
in warning dialog rather than show it.
Id: Ied763db4f76a3a2a36f134bd93a0f18047c6cf5c

Change-Id: I07d41d43d00e4fb42ad526d27ee9188d830906ea
Re-add auto brightness configuration UI (2/2).

Change-Id: I6c56a48fa2145c58a5f203ed56051451ef3f977d
Revert "[2/2] Settings: PA Version Easter Egg"

This reverts commit dd2e59baebc76a2d2745f320dd2f1058cb68a505.
Settings: Bring back the new Quiet Hours UI

Change-Id: I3bb78cb9c8ccf6df295bd724e32d97646144a6b9