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This CL refactors the animations frame rate graph
simplifying data acquisition.

Bug: 1075612
Change-Id: Icc0ed230f08cc561423e0b49881cebe67f7b7a11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2538702Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835711}