Add WebAuthn bindings and client interface.

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

Index: third_party/WebKit/Source/modules/webauthentication/ScopedCredentialOptions.idl
diff --git a/third_party/WebKit/Source/modules/webauthentication/ScopedCredentialOptions.idl b/third_party/WebKit/Source/modules/webauthentication/ScopedCredentialOptions.idl
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index 0000000000000000000000000000000000000000..6750b4731e672035dc61d4a5596781816a469293
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+++ b/third_party/WebKit/Source/modules/webauthentication/ScopedCredentialOptions.idl
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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.
+
+// https://w3c.github.io/webauthn/#dictdef-scopedcredentialoptions
+
+dictionary ScopedCredentialOptions {
+    unsigned long timeoutSeconds;
+    USVString rpId;
+    sequence <ScopedCredentialDescriptor> excludeList;
+    WebAuthnExtensions extensions;
+};