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

Merge "Add migration indication area feature flag" into udc-dev am: fe5a1dc8 am: 0da8b900 am: 75072fad

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



Change-Id: I21d7a47fe4ab08cbc6235a74f167b7517599bbff
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>