Add a presubmit step to make sure autogenerated code is up-to-date While here, added a presubmit test for the Bug: tag too. Bug: angleproject:3046 Change-Id: I7030685230b4ce4bfc435c14ef85324e16b76274 Reviewed-on: https://chromium-review.googlesource.com/c/1402061 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>