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

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



Change-Id: I60da128b21fa4b96c35bb9ca543a6b4392401fa5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>