Add WebAuthn bindings and client interface.

third_party/WebKit/Source/modules/webauth/NavigatorAuth.h

Index: third_party/WebKit/Source/modules/webauth/NavigatorAuth.h
diff --git a/third_party/WebKit/Source/modules/webauth/NavigatorAuth.h b/third_party/WebKit/Source/modules/webauth/NavigatorAuth.h
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index 0000000000000000000000000000000000000000..fd23e2ea8654dc680d85be90fea4cfb1ea83fe73
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+++ b/third_party/WebKit/Source/modules/webauth/NavigatorAuth.h
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+// 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.
+
+#ifndef NavigatorAuth_h
+#define NavigatorAuth_h
+
+#include "platform/Supplementable.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class Navigator;
+class WebAuthentication;
+
+class NavigatorAuth final : public GarbageCollected<NavigatorAuth>,
+                            public Supplement<Navigator> {
+  USING_GARBAGE_COLLECTED_MIXIN(NavigatorAuth);
+
+ public:
+  static NavigatorAuth& from(Navigator&);
+
+  static WebAuthentication* authentication(Navigator&);
+  WebAuthentication* authentication();
+
+  DECLARE_TRACE();
+
+ private:
+  explicit NavigatorAuth(Navigator&);
+  static const char* supplementName();
+
+  Member<WebAuthentication> m_webauthentication;
+};
+
+}  // namespace blink
+
+#endif  // NavigatorAuth_h