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This CL adds functions for UrlPatternIndex which return all matching
UrlRules. These functions will be used to evaluate modifyHeaders rules
for the declarativeNetRequest API.

Bug: 1064497
Change-Id: Iab0260892a2d7ad4ab5180b84320dfa2675cbf14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2116563
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756099}