Merge "Allow non-resizable apps in split-screen (8/n)" into sc-dev am: 5c3ad3a5

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13445762

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I7c5d5710006ee75f042d8975e5b72b1df1d7b88c