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We are going to expose the internal Rule class and some common rules
sub-classes inside of ProxyBypassRules, so we could build different
rule set based on different business logic.

Bug: 1030092
Change-Id: I054e05bf1302506bee77e5c1a8e30ee8f973daea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2008012
Commit-Queue: Shimi Zhang <ctzsm@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736558}