Merge "Add migration indication area feature flag" into udc-dev am: fe5a1dc8 am: bea8e3cd am: cb1001f3 am: a03758ff

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



Change-Id: Ifa1ce760468618a657eff52b59e9a9042ca6ecad
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>