Add WebAuthn bindings and client interface.

third_party/WebKit/Source/modules/webauthentication/NavigatorAuth.idl

Index: third_party/WebKit/Source/modules/webauthentication/NavigatorAuth.idl
diff --git a/third_party/WebKit/Source/modules/webauthentication/NavigatorAuth.idl b/third_party/WebKit/Source/modules/webauthentication/NavigatorAuth.idl
new file mode 100644
index 0000000000000000000000000000000000000000..c66f386ee117373616bc5802c3e5fa7cf62aa3a4
--- /dev/null
+++ b/third_party/WebKit/Source/modules/webauthentication/NavigatorAuth.idl
@@ -0,0 +1,9 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// https://w3c.github.io/webauthn/#web-authentication-api
+
+partial interface Navigator {
+    [RuntimeEnabled=WebAuthentication] readonly attribute WebAuthentication authentication;

[esprehn, 2016/11/29 06:00:49]

I don't think we've ever shipped an api with a Web prefix before. This probably
needs tag review.

[kpaulhamus, 2016/12/01 21:44:52]

Just noting we talked about this and decided the 'Web' can stay for now.

[kpaulhamus, 2016/12/20 19:17:00]

Tracking with https://github.com/w3c/webauthn/issues/310

+};