Merge "Show bg color during ActivityEmbedding change anim for legacy...

Merge "Show bg color during ActivityEmbedding change anim for legacy transition" into tm-qpr-dev am: 2d0d4920

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20265109



Change-Id: I999c2a6e635edbe70b15e7e20126fce28abeefc2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>