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This is a reland of 41e54be1

One of the checks is converting the times from ms->s. In practice
seconds is plenty precise but in the test 800ms ended up being 0,
so increase it to 1000ms (similar to ImpressionCountResetsAfterTimeout
which was not flaky).

Original change's description:
> [NTP] Cap search suggestion impressions
>
> The parameters for capping suggestions impressions are provided as part
> of the update proto. Read and update the local pref on each fetch. Use
> these prefs to determine if the impression cap has been reach or if
> fetching is frozen due to an empty response.
>
> Bug: 904565
> Change-Id: Ib5539a99f18e9da2ac1223ecc7aff65cb909bca8
> Reviewed-on: https://chromium-review.googlesource.com/c/1395188
> Commit-Queue: Kyle Milka <kmilka@chromium.org>
> Reviewed-by: Kristi Park <kristipark@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#624994}

Bug: 904565
Change-Id: I424cb51d2a9c1738c0e5168f58ef52b73ed4b223
Reviewed-on: https://chromium-review.googlesource.com/c/1431472Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625437}