Merge "Expose invisible windows from WindowInfosListenerForTest" into udc-dev am: 31781318 am: c42e9a7f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22802957



Change-Id: Id2be71de834bb4e0cb2380d957999c98c4a9b29e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>