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This change creates a new Polymer component network-diagnostics that
runs diagnostic routines and then displays the results.

Bug: chromium:1098405
Change-Id: I245b3378e477f4fae89d9b33201c7359cc9e8e56
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2261189
Commit-Queue: Trent Begin <tbegin@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789532}