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This metric tracks usage of backends and is useful long-term

Bug: 1140055
Change-Id: Ie672922dd8d465da30472fec947582c216ef46f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2540611Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Christos Froussios <cfroussios@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828268}