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This change adds a basic mojo interface to query NetworkHealth for the
cached active networks and devices.

Bug: chromium:1057739
Change-Id: I5c7437a522535f8a3154e3ec74bc17d67f4b2dfa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2161701
Commit-Queue: Trent Begin <tbegin@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763424}