Merge "Reland: More robust updating of "runnable" list." into udc-dev am: 518b9c7d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22462023



Change-Id: I89a95cda0273f770a2cbfd22b256679263a44cc7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>