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Currently, ChromeAuthenticatorRequestDelegate implements
FidoRequestHandlerBase::AuthenticatorMap interface, and each events in
transport layer trigger observer function in the embedder.

In order to make embedder interface simpler, aggregate all transport
layer events that is required prior to initiating WebAuthN UI dialog
in FidoRequestHandlerBase. Once all the information is gathered, combine
all retrieved data in FidoUiAprioriData struct and invoke single
OnTransportLayerInfoReceived() observer function in the embedder layer.

Bug: 866601
Change-Id: Id9ac2456fca14351682a8c72a7813c3f8674c552
Reviewed-on: https://chromium-review.googlesource.com/1170041
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@{#582756}