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

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

Change-Id: I66d1c17aad6ce86d4bb1300a6b2d254112acfaf1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>