Add WebAuthn bindings and client interface.

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

+// 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.
+
+#include "modules/webauth/NavigatorAuth.h"
+
+#include "core/frame/Navigator.h"
+#include "modules/webauth/WebAuthentication.h"
+
+namespace blink {
+
+NavigatorAuth& NavigatorAuth::from(Navigator& navigator) {
+  NavigatorAuth* supplement = static_cast<NavigatorAuth*>(
+      Supplement<Navigator>::from(navigator, supplementName()));
+  if (!supplement) {
+    supplement = new NavigatorAuth(navigator);
+    provideTo(navigator, supplementName(), supplement);
+  }
+  return *supplement;
+}
+
+WebAuthentication* NavigatorAuth::authentication(Navigator& navigator) {
+  return NavigatorAuth::from(navigator).authentication();
+}
+
+WebAuthentication* NavigatorAuth::authentication() {
+  return m_webauthentication;
+}
+
+DEFINE_TRACE(NavigatorAuth) {
+  visitor->trace(m_webauthentication);
+  Supplement<Navigator>::trace(visitor);
+}
+
+NavigatorAuth::NavigatorAuth(Navigator& navigator) {
+  if (navigator.frame())
+    m_webauthentication = WebAuthentication::create(*navigator.frame());
+}
+
+const char* NavigatorAuth::supplementName() {
+  return "NavigatorAuth";
+}
+
+}  // namespace blink