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Skeleton component for cpu chart
https://screenshot.googleplex.com/C7PPFcPZ95FZXJ8

Bug: 1125150
Test: browser_tests --gtest_Filter=DiagnosticsApp*
Change-Id: Ic2ae0209fb71f894df8a4b3a4e61547975ff0f11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438882
Commit-Queue: Joon Ahn <joonbug@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812125}