Merge "Save brightness into persistent data store using a handler" into tm-dev am: bd35c8da

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17654877



Change-Id: I27dfe73dae593277057d5a8d8d862152cdab19d9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>