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

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



Change-Id: I2e0ab9f9e8a53029ef6485ac5aabc6473354d8c1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>