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When resolving a webauthn request, skip the first touch when able if the only
authenticator detected will require PIN entry. The touch is skipped when only
one authenticator is detected.

If the user clicks the back arrow and starts the request over, the touch will
not be skipped.

The patch changes FidoRequestHandlerBase to wait until all discoveries are ready
before signalling transport availability to avoid race conditions, and the
StartOver logic to keep the state on the FidoRequestHandler.

Bug: 996958
Change-Id: I8c639320b5052675ae3aad7c389bff175b529bbc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1800725
Commit-Queue: Nina Satragno <nsatragno@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#702067}