[automerger skipped] Letterbox apps in multi-window if resizeable only due to...

[automerger skipped] Letterbox apps in multi-window if resizeable only due to supportsPictureInPicture. am: 417fd4d1 -s ours am: 42583f7b -s ours am: 1ca6f4f6 -s ours

am skip reason: Merged-In I664742b033ad49a77ae21b28c7ade4011d123c74 with SHA-1 d07c1887 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17061634

Change-Id: I66e67ea4b3c8b33758e380e10d75b7377dbf9bb4