Merge "[Partial Screenshare] introduce a hidden, permission-protected Activity...

Merge "[Partial Screenshare] introduce a hidden, permission-protected Activity API" into tm-qpr-dev am: 15229543

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18089343



Change-Id: I02ce6a579a09e0676ee6f77010e68f48c7a005f9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>