Merge "Hooks for interracting with stage split components using legacy...

Merge "Hooks for interracting with stage split components using legacy recentsanimation" into sc-v2-dev am: 33edb79a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15193834

Change-Id: If06077464a9d03255c32e69348fd19ec2266c5c7