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This adds a historical_histogram_data.md file in which data from the
ThreadPool.NumTasksRunWhileQueuing.* histogram is reported. Actions to
improve the situation described by this histogram are recommended.

Bug: 906079
Change-Id: I4872b6e0c38979161547c8e40ff3125bb971d50a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1804789
Commit-Queue: François Doray <fdoray@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698464}