Merge "Adding logging for the ML mBack gesture model." into rvc-qpr-dev am: 0b44441e7c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13238787

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ib7fc9cb9473594e933d59625b7ebca69d4205bfd