Merge "Implement bouncer fade-in animation over dreams." into tm-dev am: 2d5bd43b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17225606



Change-Id: I1fe198e8783a5a6ee0c85524222d33835eb9604b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>