Merge "Revert "More robust updating of "runnable" list."" into udc-dev am: 5b7d07f5

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22411430



Change-Id: I077f0ea2740cc364fd87e852bc5c7504e9a46736
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>