Merge "Merge "Also check PiP activity visibility to determine if enter-pip"...

Merge "Merge "Also check PiP activity visibility to determine if enter-pip" into udc-dev am: cc054b94" into udc-dev-plus-aosp am: d88d571b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23754867



Change-Id: Iddcb3abd30789f813cbf5ed3168f18c564a7adba
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>