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This will be used by SignedExchangeHandler to verify that certificates
for signed exchanges have the testCanSignHttpExchanges extension.

Bug: 851778
Change-Id: Ib32a00246da5176b3077e7fcf70ad283a8511b98
Reviewed-on: https://chromium-review.googlesource.com/1103430
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569514}