Merge "[automerger skipped] Letterbox apps in multi-window if resizeable only...

Merge "[automerger skipped] Letterbox apps in multi-window if resizeable only due to supportsPictureInPicture. am: 417fd4d1 -s ours" am: 391569fd -s ours

am skip reason: Merged-In I664742b033ad49a77ae21b28c7ade4011d123c74 with SHA-1 5e7baf63 is already in history

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

Change-Id: Id1c89e4e4bb17ea83d35585ce83129648991a584