Merge "[MediaProjection] clarify cases handled by controller" into udc-dev am: 2d07610d am: eed03484

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22094722



Change-Id: I3d313d4a86cd6acc1842fb3978d711737f96c187
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>