Merge "Allow custom animations to run on ActivityEmbeddings and propagate...

Merge "Allow custom animations to run on ActivityEmbeddings and propagate custom backdrop color." into tm-qpr-dev am: 9c50f7af am: 3952497c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18705127



Change-Id: I132f08d3fb6d0f838626ccefe343fb8c921d87d3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>