Add WebAuthn bindings and client interface.

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

Index: third_party/WebKit/Source/modules/webauthentication/ScopedCredentialParameters.idl
diff --git a/third_party/WebKit/Source/modules/webauthentication/ScopedCredentialParameters.idl b/third_party/WebKit/Source/modules/webauthentication/ScopedCredentialParameters.idl
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index 0000000000000000000000000000000000000000..a9f73d03d0e7e0adece5abaf140e6a7a6d052a42
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+++ b/third_party/WebKit/Source/modules/webauthentication/ScopedCredentialParameters.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-scopedcredentialparameters
+
+dictionary ScopedCredentialParameters {
+    required ScopedCredentialType type;
+    required AlgorithmIdentifier algorithm;
+};