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This change makes the engagement score threshold used by the top host
provider configurable in order to increase the number of hosts and
navigations covered by the HintsFetcher by added a finch parameter.

Bug: 999541
Change-Id: I5d5302f8449524158c09420b12b591e071dfb556
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1783230Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Doug Arnett <dougarnett@chromium.org>
Commit-Queue: Michael Crouse <mcrouse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693219}