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This is a followup to b5cccac5, and has the same motivation: to
improve testability of Certificate Transparency enforcement.
Injecting the time of evaluation allows a test to be written that
shows that while a call may return |CT_POLICY_COMPLIES_VIA_SCTS|
today, the same inputs may return |CT_POLICY_BUILD_NOT_TIMELY|
tomorrow.

Change-Id: If4a4519ccaf7b1470477fc4c1978de1d14e58aa8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1626016
Commit-Queue: Matt Braithwaite <mab@google.com>
Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664063}