Merge "Fix the race condition between creating and killing process group" into udc-dev am: c601737f am: b57cb2a0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22970327



Change-Id: I4acc12ba563a8a4c2c1ba9fed05fb8daa47444e4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>