Merge "[flexiglass] Adds logging for scene and visibility changes." into udc-qpr-dev am: 98870fa0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24296061



Change-Id: I7df2f03c2ae9300f01e071572c1fbbb4689cda40
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>