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This field will be used by Phone Hub to start discovering a remote
device for an "out-of-band" connection using a pre-synced Bluetooth
address. This CL also makes the fast_advertisement_service_uuid field
optional for out-of-band connections.

Bug: 1106937
Change-Id: I35845fbf6a4626bfd18fd1e9451f4a18fdaabf14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2493427
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#824971}