Merge "Add dream overlay open animation." into tm-qpr-dev am: 8b9a75e599 am: e91d00344b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20246466

Change-Id: I678c3d9a1f71e8aa6fad9d8ea154d9a756bbfce5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>