Merge "Allow non-resizable apps in split-screen (4/n)" into sc-dev am: 3c560754

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13412975

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Iea7028666d2f258c2037ee9f794752c828c1c6f9