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

Merge "Also check PiP activity visibility to determine if enter-pip" into udc-dev am: cc054b94 am: 2da54539 am: 66529587 am: f2144e99

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



Change-Id: I41486dabf4437660ac90153738bd0e3b32de1d20
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>