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- This CL adds a sub label to cellular networks which have not yet been
  activated to indicate the user can click and activate that network.
- Opens new cellular setup dialog when "click to activate" is clicked

Screenshot: https://screenshot.googleplex.com/3hmXeFo7gPQhcBZ.png

Bug: 1093185
Change-Id: I5f7df05123be56e97c74125313263ff50d0a0124
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2629989
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Azeem Arshad <azeemarshad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845388}