Merge "Refactor and fix flaky tests in WindowOnBackInvokedDispatcherTest" into udc-dev am: f4f331d65a am: ba85d52709 am: 692a86e309 am: 8fa111181e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23352458

Change-Id: Idaed4ead046cc1c79c2857bed0d3e9b134ee4b60
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>