GitLab

Specifically enable:
 - clang-format for JS files
 - Various HTML/CSS/JS checks including ESLint checks.
 - SVG optimization checks

Fixed: 1019312
Change-Id: I01628b5faae9ff95dc5eebefec2a0c4956ed3664
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888151
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Auto-Submit: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714586}