Merge "More robust updating of "runnable" list." into udc-dev am: 0d0d38f3 am: dc5f9fdc

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22314814



Change-Id: I2bbdf1b8d051a52b0d13079feee23573749f6149
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>