Merge "Log each time the layer stack changes for DisplayDevice." into...

Merge "Log each time the layer stack changes for DisplayDevice." into tm-qpr-dev am: 81a111d8 am: d392b4fb am: 09fcc2b8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21601972



Change-Id: Id5af26ceba23771e1437118066ecba22a6ef4871
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>