Merge "Validate target view surface in PipDismissTargetHandler" into tm-dev am: 5cb6c5a9 am: 83c72ad8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17821975



Change-Id: I96ccf54aff48a81773736339f2d39b04a8f96594
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>