Add LayoutTest for update() from workers without controllers

Bug: 805496
Change-Id: Idb1cc63960409eeb8117d74267f5df33f401eb08
Reviewed-on: https://chromium-review.googlesource.com/932101
Commit-Queue: Yannic Bonenberger <contact@yannic-bonenberger.com>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577538}