Merge "Create its own Handler instance for persisting display brightness" into tm-dev am: e8f4a6d6 am: 76a46ead am: f5c021c6

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18827235



Change-Id: I11e899c3aa998de9e2ebaf3439f3cbdd950340e6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>