Merge "[MediaProjection] Handle null DisplayContent when trying to set the...

Merge "[MediaProjection] Handle null DisplayContent when trying to set the session" into udc-dev am: 9a50b8ad am: 1d46aedb am: db9acd1f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23201202



Change-Id: I4d182839987de5651bd79f6d5529ef1fb6c8e249
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>