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We would like to deprecate smoothness metrics and replace them with
equivalent TBMv2 rendering metrics. To prevent those changes from
breaking benchmarks that use legacy smoothness metrics, this CL chanes
those benchmarks to compute both legacy and equivalent TBMv2 metrics.
After the transition is complete, we can just compute TBMv2 ones.

Bug: 890757
Change-Id: I95203ec76a09be2273e4f71fe3e372e1ff04cc6d
Reviewed-on: https://chromium-review.googlesource.com/c/1258213Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Ehsan Chiniforooshan <chiniforooshan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596210}