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This is allowing us to compute a MEI score during the warm up period
and cut down the warmup period if we know that the score would at worse
already be high enough.

For example, with minimum visits at 10 and MEI threshold at 3, after 3
visits with playback, a website could get MEI privilege instead of
waiting for the 7 following visits.

Bug: 807268
Change-Id: Id5f65f2d97375ed7507b99925459ab11139c2ae4
Reviewed-on: https://chromium-review.googlesource.com/893263Reviewed-by: Tommy Steimel <steimel@chromium.org>
Commit-Queue: Mounir Lamouri (slow) <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532891}