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In order to prevent MacTouchId and BLE system UI dialog from appearing
prior to user explictly selecting which transport type to use,
ChromeAuthenticatorRequestDelegate should be able to "lazily" dispatch
WebAuthN request to FidoAuthenticators. Add logic trigger request from
embedder layer.

Bug: 866601
Change-Id: Iec3e16c2c87423c7af101e529f1a12ade62652ee
Reviewed-on: https://chromium-review.googlesource.com/1175418
Commit-Queue: Jun Choi <hongjunchoi@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583800}