GitLab

This is essentially pulling
https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2351775
into the Chromium repo, so that it can be maintained alongside the proto
definition that it is parsing and formatting.

R=mathias

Bug: 1103854
Change-Id: I25707cf94678682d856f085b3aa259b02361dfa0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360517Reviewed-by: Mathias Bynens <mathias@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799228}