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This is a core net/ performance metric, and is needed to help
investigate any significant change time URLRequests take to complete.

Bug: 1088996
Change-Id: Ide5f2c0f3f592ce67ad1563fcacbea64fc8b5f16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424256Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812108}