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This adds the existing network-diagnostics cr_component into the
connectivity diagnostics app and pipes in the necessary dependencies
from chrome.

Bug: chromium:1140611
Change-Id: I7fa82ab611be6da4a7b93031e2c9ffa4efbd3925
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490981
Commit-Queue: Trent Begin <tbegin@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823243}