Merge "Add fallback screen logic to CredentialSelectorActivity" into udc-dev am: 80420d7e am: 83d75414

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22254451



Change-Id: I02d2e83aefa9cd71269d21bc40263c88d676c117
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>