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This CL adds a loading telemetry benchmark that measures performance of
agents heavy web-sites, which the MBI team currently targets optimization.
The added benchmark is for an internal team use, and not yet scheduled on
the perf waterfall (thus UNSCHEDULED_ prefix).

Bug: 1051790
Change-Id: I96b9305bc8200153fa8587de338824d56bc47459
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2576056Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Commit-Queue: Kouhei Ueno <kouhei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834530}