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Sync down local-device, contact, and certificate data from the Nearby
server when the sending or receiving flow starts, making our best effort
at freshness. We do not wait for these calls to finish. The periodic
server requests will typically be sufficient, but we don't want the user
to be blocked for hours waiting for a periodic sync.

Manually verified that the download is performed once during a sending
flow and once during a receiving flow.

Fixed: b/168834197
Change-Id: Id35e097ce09cfe7c5a85f079074943788d2359b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505009
Auto-Submit: Josh Nohle <nohle@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Commit-Queue: Josh Nohle <nohle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821779}