Merge "Improve Split portrait gesture animation" into tm-qpr-dev am: 3f1d875795

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20365288

Change-Id: Iaa04fc0a2cf9311fd3dab23fe42bfd51084f8210
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>