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Currently the blocklist checks hide other interesting EligibilityReasons
from being logged to UKM (such as hint match and triggering ECT) that
could prove helpful in knowing more about hint availability and also
more clearly that when a preview would have been triggered except for
the local blocklist. This refactor pushes the blocklist checks to
after these other triggering checks (but still before the coinflip
check).


Bug: 1023611
Change-Id: Ica2e75f8099674a2767141e5234747fd10a7d4bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1912143Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Commit-Queue: Doug Arnett <dougarnett@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714754}