Add WebAuthn bindings and client interface.

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

Index: third_party/WebKit/Source/modules/webauthentication/WebAuthnAssertion.idl
diff --git a/third_party/WebKit/Source/modules/webauthentication/WebAuthnAssertion.idl b/third_party/WebKit/Source/modules/webauthentication/WebAuthnAssertion.idl
new file mode 100644
index 0000000000000000000000000000000000000000..35a1619271d9bd29f12a654253f6df371ebb6708
--- /dev/null
+++ b/third_party/WebKit/Source/modules/webauthentication/WebAuthnAssertion.idl
@@ -0,0 +1,15 @@
+// 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/#webauthnassertion
+
+[
+    RuntimeEnabled=WebAuthentication,
+    SecureContext
+] interface WebAuthnAssertion {

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

Why not just WebAuth or Auth? The n in the middle doesn't mean anything and is
going to be a wart for developers to remember for the next 30 years.

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

Tracking with https://github.com/w3c/webauthn/issues/311

+    readonly attribute ScopedCredential credential;
+    readonly attribute ArrayBuffer clientData;
+    readonly attribute ArrayBuffer authenticatorData;
+    readonly attribute ArrayBuffer signature;
+};