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This change introduces the CpuUsageData and accompanying tests.

Bug: 1128204
Change-Id: I401b4884be3cac434196da1ab35977c9e8866e3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522055
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Auto-Submit: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824939}