Merge "Introduce defaults to ActivityLaunchAnimator.Callback." into tm-qpr-dev am: 7da4acbb93 am: b456b4416a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20979113

Change-Id: Ife8de2491722b33752d0143f5fc4301a3d561ef8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>