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Add the `AddCredential` command to ChromeDriver.

A draft of the proposed addition to the specification is available at
https://github.com/w3c/webauthn/pull/1256

This is one in a series of patches intended to create a Testing API for
WebAuthn, for use in Web Platform Tests and by external webauthn tests.

For an overview of overall design, please see
https://docs.google.com/document/d/1bp2cMgjm2HSpvL9-WsJoIQMsBi1oKGQY6CvWD-9WmIQ/edit?usp=sharing

Bug: 922572
Change-Id: Id9b9fb75ab6682126d5d1275b12785640b7f0053
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1729963
Commit-Queue: Nina Satragno <nsatragno@chromium.org>
Auto-Submit: Nina Satragno <nsatragno@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683364}