Add Chromium pools to shadow buckets Adds the Chromium CI and try pools to the ANGLE shadow buckets, as we are in the process of merging ANGLE builder capacity into those. Bug: chromium:375244064 Change-Id: Ia8e46958fe13dfd7c77f33165a236d83c2fcd362 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6492350 Auto-Submit: Brian Sheedy <bsheedy@chromium.org> Commit-Queue: Brian Sheedy <bsheedy@chromium.org> Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Commit-Queue: Yuly Novikov <ynovikov@chromium.org>