Merge "Add brightness event logging." into tm-dev am: 2e83c5af am: 2c2a6f5f am: d64d7694

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17662094



Change-Id: Ieabe39618c3b49c7c40453c5913f92baf0026f0c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>