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Screenshot: http://shortn/_EzVSDUHswl
Spec: https://carbon.googleplex.com/cros-ux/pages/diagnostics/mvp#db1415fc-6806-4059-958e-459d8da17580

Bug: 1125150
Test: browser_tests --gtest_filter=DiagnosticsApp*
Change-Id: I910d41a48c036b4a9067355faff4592c80b88aed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2530902Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Commit-Queue: Michael Checo <michaelcheco@google.com>
Cr-Commit-Position: refs/heads/master@{#844876}