Merge "Verify enableOnBackInvokedCallback at the app-level if ActivityInfo is null" into udc-dev am: 379a3d53 am: 0635edf0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22852616



Change-Id: I74b53130c6bfccfd579486c8bbbdba716494b7e4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>