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This introduces PlatformAuthenticatorInfo as a parameter object to
FidoRequestHandlerBase::SetPlatformAuthenticatorOrMarkUnavailable. The
struct holds the existing std::unique_ptr<FidoAuthenticator>, which is
the platform authenticator itself, and an additional bool indicating
whether the authenticator has a matching credential for
GetAssertionRequest. The bool is plumbed through to
TransportAvailabilityInfo for consideration by the UI.

Bug: 847985
Change-Id: Ice46685eef31eb29cb8fdcb0d471e4b40bfb97b3
Reviewed-on: https://chromium-review.googlesource.com/1179088
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Jun Choi <hongjunchoi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584580}