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This change introduces the possibility to query a FidoBleDevice whether
or not it is currently in pairing mode. In accordance with the CTAP spec
this is done by looking at the advertisment data flags if possible, and
falling back to investigating service data if required.

Bug: 763303
Change-Id: I373151a10d63e83ca2ac57f7b53c1269b9d60cfc
Reviewed-on: https://chromium-review.googlesource.com/1096234Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: James Hawkins <jhawkins@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569929}