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The goal is to add a second implementation further downstream.
This CL is a refactoring only and should not have user-facing changes.

Bug: b/174445633
Change-Id: I9d0fc65daf53c968557a79dd6db0bdfc7c03bf46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2573138Reviewed-by: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Commit-Queue: Rahul Goyal <goyalrahul@google.com>
Cr-Commit-Position: refs/heads/master@{#838003}