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This change adds the network health component to the connectivity
diagnostics application. This serves as a short summary of the currently
connected networks and details about them.

Bug: chromium:1142857
Change-Id: Ibfac37e10bd4badc87f234b8f0fd842667fc8a24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587501
Commit-Queue: Trent Begin <tbegin@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839777}