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Screen: http://screen/BhQEsVaDzMLxAEj
Spec: https://carbon.googleplex.com/cros-ux/pages/diagnostics/mvp#000933fc-29e1-4d4b-aa49-9d1b8fb16a24

Bug: 1125150
Test: browser_test --gtest_filter=Diagnostics*
Change-Id: Ic52a8249e29e17ce703a1acc91d1e8280db93073
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572790Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Joon Ahn <joonbug@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833813}