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This adds a mojo interface for the discovery page to find nearby devices
and connect to one. For unknown devices we require an additional
confirmation step to verify a connection id. The user has the option to
accept or reject on the nearby-confirmation-page.

Bug: 1099710
Change-Id: I308a7926efef61a3fa872051b00fcf35e62a8287
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2235516
Commit-Queue: Richard Knoll <knollr@chromium.org>
Reviewed-by: Alex Gough <ajgo@chromium.org>
Reviewed-by: Alex Chau <alexchau@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#790643}