In-browser DNS-based service discovery system

chrome/browser/local_discovery/service_discovery_client.cc

+// Copyright (c) 2013 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 "chrome/browser/local_discovery/service_discovery_client.h"
+#include "chrome/browser/local_discovery/service_discovery_client_impl.h"
+
+namespace local_discovery {
+static ServiceDiscoveryClient* g_instance = NULL;
+
+ServiceDiscoveryClient* ServiceDiscoveryClient::GetInstance() {
+  if (!g_instance) {
+    g_instance = new ServiceDiscoveryClientImpl();
+  }
+
+  return g_instance;
+}
+
+void ServiceDiscoveryClient::SetInstance(ServiceDiscoveryClient* instance) {
+  g_instance = instance;
+}
+
+}  // namespace local_discovery