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Screenshot: http://shortn/_ldNJuxuRhF

Spec: https://carbon.googleplex.com/cros-ux/pages/diagnostics/mvp#dd35f9cb-3d67-452e-a98c-89635d8c31c3

Bug: 1125150
Test: browser_tests --gtest_filter=DiagnosticsApp*
Change-Id: I4756e38037d8ba4ba9ed9435f2f6a6a21d0e4b05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2557728
Commit-Queue: Michael Checo <michaelcheco@google.com>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Joon Ahn <joonbug@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841720}