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Add a global rules constant that is not exposed programmatically. For
this change, extensions can index up to (global limit + old static
limit) rules per ruleset, and enable that many rules as well. Rulesets
which exceed this limit are effectively ignored.

This change is currently hidden under a feature flag.

Bug: 983299
Change-Id: I63fba98e3a17fdb6e67ae78bb1ead9bf963d7b11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2309550Reviewed-by: Anqing Zhao <anqing@chromium.org>
Reviewed-by: Chase Phillips <cmp@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801226}