Merge "Animate out screenshot UI on back and CLOSE_SYSTEM_DIALOGS" into rvc-qpr-dev am: 764e7ac5

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12048482

Change-Id: I9b48a4c979f77933639d41f4bf6a109c1dfe1b24