Merge "Add migration indication area feature flag" into udc-dev am: fe5a1dc8 am: bea8e3cd am: cb1001f3

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



Change-Id: I57a07b423e337a9b7d371cfed0f9236b8dfd819f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>