Add DiscoveryNetworkMonitor implementation

chrome/browser/media/router/discovery/discovery_network_info.cc

+// Copyright (c) 2017 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/media/router/discovery/discovery_network_info.h"
+
+DiscoveryNetworkInfo::DiscoveryNetworkInfo() {}
+
+DiscoveryNetworkInfo::DiscoveryNetworkInfo(const std::string& name,
+                                           const std::string& network_id)
+    : name(name), network_id(network_id) {}
+
+DiscoveryNetworkInfo::~DiscoveryNetworkInfo() {}
+
+DiscoveryNetworkInfo::DiscoveryNetworkInfo(const DiscoveryNetworkInfo&) =
+    default;
+
+DiscoveryNetworkInfo& DiscoveryNetworkInfo::operator=(
+    const DiscoveryNetworkInfo&) = default;
+
+bool DiscoveryNetworkInfo::operator==(const DiscoveryNetworkInfo& other) const {
+  return name == other.name && network_id == other.network_id;
+}
+
+bool DiscoveryNetworkInfo::operator!=(const DiscoveryNetworkInfo& o) const {
+  return !(*this == o);
+}