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This is meant to allow Slow Page Triggering of Previews - that is, for
previews that may specify variable network quality thresholds based
on the URL (via OptimizationHints), the ECT is deferred until commit
time.

It renames and refactors the ShouldAllow* and IsURLAllowed* methods
to give them more power (it pushes down the ECT threshold determination
instead of having multiple call sites try to provide). There is some
reordering of the PreviewsAvailablity passed reasons.

Some more cleanup is merited but deferred to keep the diffs simpler for
this change.


Bug: 895581
Change-Id: Id8636312a9e707dd1181ca0df514f3f743347671
Reviewed-on: https://chromium-review.googlesource.com/c/1310562
Commit-Queue: Doug Arnett <dougarnett@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606243}