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This adds a new WebUI dialog for network configuraiton using the
shared network-config component.

Bug: 380937
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I44d9db4f01e366afc59e56286cc8fd7adf536bea
Reviewed-on: https://chromium-review.googlesource.com/693288Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506906}