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This adds Start/StorAdvertising to the NearbyConnections interface and
hooks it up to the NearbyConnectionsManager on the browser side and to
the NearbyConnections class on the utility process that delegates to the
third_party library.

Bug: 1076008
Change-Id: I2cf883432c625d3c34060536fcbfa13f190c98c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339470Reviewed-by: Alex Gough <ajgo@chromium.org>
Reviewed-by: Alex Chau <alexchau@chromium.org>
Commit-Queue: Richard Knoll <knollr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796410}