Merge "Implement bouncer fade-in animation over dreams." into tm-dev am: 2d5bd43b am: 383986e4

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



Change-Id: Ica0b90bdeeef12adb20668cc66c236a95bf41eaf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>