[chromium] use go swarming client for chromium builder

This CL switches swarming client for chromium builder from python to go.

I will land this if below CL worked successfully.
https://chromium-review.googlesource.com/c/chromium/tools/build/+/1372185

Bug: 894045, 914009
Recipe-Nontrivial-Roll: build_limited_scripts_slave
Change-Id: Id61c7ce10e715fc1cf7d2e8f5685b53ec2118993
Reviewed-on: https://chromium-review.googlesource.com/c/1376169
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
36 files changed
tree: c6dc4b094037f2076de601ed48b957cbf0dd54f7
  1. infra/
  2. masters/
  3. scripts/
  4. site_config/
  5. slave/
  6. tests/
  7. third_party/
  8. .gitattributes
  9. .gitignore
  10. .vpython
  11. codereview.settings
  12. DEPS
  13. environment.cfg.py
  14. LICENSE
  15. OWNERS
  16. PRESUBMIT.py
  17. README.md
  18. WATCHLISTS
README.md

build

Hi build contributor! If you do any change in scripts/master/ or touching any master's html/ directories, you must restart master.chromium.fyi first and ensure that it still works before restarting other masters.

Recipes

If you're here to make a change to ‘recipes’ (the code located in scripts/slave/recipes*), please take a look at the README for more information pertaining to recipes.