Merge "Incremental update to portrait split gesture animation" into tm-qpr-dev...

Merge "Incremental update to portrait split gesture animation" into tm-qpr-dev am: 2345ce43 am: 1ca5302c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20457062



Change-Id: I20e55cfc8d59d7e7f0e2c7f8e6f4bd12bbb96d77
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>