Merge "Add migration indication area feature flag" into udc-dev am: fe5a1dc8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23134078



Change-Id: Ieb7c9807af28f8941f4720c745274aabd409266a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>