This is a tweaked version of the script that I just added to Chromium:

https://cs.chromium.org/chromium/src/third_party/inspector_protocol/roll.py

Change-Id: I21566f2472c20ecfd713996974c0833b7988a122
Reviewed-on: https://chromium-review.googlesource.com/c/1469376Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Commit-Queue: Johannes Henkel <johannes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59609}