Merge "Restrict activity launch when caller is running in the background" into rvc-dev am: dce6a262f7

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23262449

Change-Id: Idf1ca87ce39c5c838254ef42ddf8714073140b85
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>