Merge "Fix pip window visibility assertions" into sc-dev am: 8a26f00f am: d59e0976 am: d4e7e149

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14327906

Change-Id: I5a5381a70d32f089a49837ad0e667052ef24f00c