Merge "Fix security vulnerability allowing apps to start from background" into sc-dev am: 408cac13c0 am: 3b2f30dfc9 am: 6a8afefe7d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/26941037

Change-Id: If359f3da67a43c2a8883eefca4a9c812e974ea7c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>