Merge "[Partial Screen Sharing] Dismiss background after app selector...

Merge "[Partial Screen Sharing] Dismiss background after app selector launched" into udc-qpr-dev am: db448b38 am: 69e648e3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24025610



Change-Id: Ibc0305d70868c868d9d4f1a4bd42c7bee2e84d9b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>