Merge "Improve enter split transition" into tm-qpr-dev am: 9ab7dedcdd am: a335abfa66

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>