Merge "Improve enter split transition" into tm-qpr-dev am: 9ab7dedc am: a335abfa

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19458153



Change-Id: I7479c9ce2190b6c30a6a2e98559e4b2744e43d3f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>