commit 9320191858d62d6a50842bf248d0f9c9752ea941
author Fiona Campbell <flc@google.com> Mon Feb 15 12:22:17 2021 +0000
committer Fiona Campbell <flc@google.com> Wed Mar 24 19:34:36 2021 +0000
tree 29b3eee3f30de3af5e841bcc3eaa16e4abc12c41
parent 80e8713490d1567d4e0de354414698744f5a5933

Store Brightness Per Display

This changes stores a brightness value per display.

Add brightness value item to persistent data store.
Add BrightnessSettingController to save and retrieve brightnesses.
It is indexed by primary display device of the concerned logical display.
Add method in DisplayManager to expose this.

Bug: 176985835
Bug: 147415200
Bug: 175286226

Test: manual, check "adb shell dumpsys display | grep -A10 Persistent" shows brightness values for each display attached.
Change-Id: Ib8557f8a0f45a5bfb0810967f678015d3f121bb9