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Connected Bluetooth FidoAuthenticator can be in pairing mode when
discovered by the browser, or device can change to pairing mode anytime
during the lifetime of FidoDiscovery. As so add function to notify
embedder when connected FidoAuthenticator changes its state to pairing
mode.

Bug: 877344
Change-Id: I3dc46e67064fdf7361b6cf2ef144d7daa907e92a
Reviewed-on: https://chromium-review.googlesource.com/c/1246596
Commit-Queue: Jun Choi <hongjunchoi@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597261}