Merge "[automerger skipped] Letterbox apps in multi-window if resizeable only due to supportsPictureInPicture. am: 417fd4d1 -s ours" am: 391569fd -s ours am: 3f56c529 -s ours am: 3d8dffb5 -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: Ia5c88e9bc0e25894f5a832c47c198b36fd219469