[jank]: Add lookalike url trace events and uma histogram.
We're seeing jank in LookalikeUrlService::OnFetchEngagedSites from uma sampling profiler. There's a few possible culprits: - First call to GetDomainInfo causes icu loading - url_formatter::GetSkeletons is expensive and called on many urls - IsEngagementAtLeast is expensive and called on many urls To better understand the problem, this CL adds relevant trace events and records count of engaged sites as UMA histogram. Bug: 1135279 Change-Id: Ie6ee4ed2dbeeed26e4bbdd72726a0ad48e9bc4bf Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2615322Reviewed-by:Etienne Bergeron <etienneb@chromium.org> Reviewed-by:
Weilun Shi <sweilun@chromium.org> Reviewed-by:
Joe DeBlasio <jdeblasio@chromium.org> Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org> Cr-Commit-Position: refs/heads/master@{#844109}
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