GitLab

This patch adds a basic UA style sheet for the 'decimal' and 'disc'
counter styles, and plumbs them into RuleSet. This is in preparation to
implement tree-scoped counter style references.

Bug: 687225
Change-Id: If4effec939a2bfdedc5079e95c4c593f622db652
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2574071Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833915}