Merge "Add leash check in PipTaskOrganizer#fadeExistingPip" into sc-v2-dev am: d208a46d52 am: 55416ed3fa

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16719697

Change-Id: Id7c332d230049cddeb217c186c5e7c5c64ae4896