am 3c135e76: Merge "Fix race condition in TransitionCollector."
am 3c135e76: Merge "Fix race condition in TransitionCollector."

* commit '3c135e76143ec041fcd5914e794d328d3ab5fa7f':
  Fix race condition in TransitionCollector.

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst