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When the Nearby Share service is created, start the certificate,
contact, and local-device-data managers. No manager tasks are run until
the managers are started.

We also add logging.

Change-Id: I9ee592d181f1fbe670318d364b3a5fec4dec45b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2370924
Commit-Queue: Josh Nohle <nohle@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Auto-Submit: Josh Nohle <nohle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805829}