Merge "Only allow mirroring on a VirtualDisplay with a mirroring flag or...

Merge "Only allow mirroring on a VirtualDisplay with a mirroring flag or MediaProjection instance." into udc-dev am: df60ec39 am: a889ee5a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22075082



Change-Id: Ie4f926af739a1c9f80c215233a17b30badeba3f5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>