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The visibility page is just stubbed in place without the center content.
A shared component will be added to implement the visibility selection
in a future CL. The link used for "Managed Contacts" is also temporary.
Specs, strings, accessibility handled in a follow-up CL.

The "Confirm" button will however actually enable Nearby Sharing.

Screenshot: https://screenshot.googleplex.com/xOasYwc8hSq
Change-Id: I68ab57e10611045270d261deae1dd66f3e3969f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340681
Commit-Queue: James Vecore <vecore@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796060}