Merge "ActivityView animations!" into rvc-dev am: ab0ffd1d48 am: 61d58dcf0a am: 8956216702

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11793537

Change-Id: I92d2d3200a1c261b0a5634a4e2d41c5928cf8675