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: Icda9b83d2777db514a70d056942e28352d9a8e83