Add DiscoveryNetworkMonitor implementation

chrome/browser/media/router/discovery/discovery_network_list.h

Index: chrome/browser/media/router/discovery/discovery_network_list.h
diff --git a/chrome/browser/media/router/discovery/discovery_network_list.h b/chrome/browser/media/router/discovery/discovery_network_list.h
new file mode 100644
index 0000000000000000000000000000000000000000..a3d69a854e812ccbb598ca2dadec8e86c003b084
--- /dev/null
+++ b/chrome/browser/media/router/discovery/discovery_network_list.h
@@ -0,0 +1,24 @@
+// 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.
+
+#ifndef CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DISCOVERY_NETWORK_LIST_H_
+#define CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DISCOVERY_NETWORK_LIST_H_
+
+#include <string>
+#include <vector>
+
+struct DiscoveryNetworkId {
+  // e.g. eth0, wlan0
+  std::string interface_name;
+  // Some form of identifier for the network to which this interface is
+  // connected.  For WiFi, we assume the associated SSID identifies the
+  // connected network.  For Ethernet, we assume that the network remains the
+  // same for each device, so we use the device's MAC address to identify the

[mark a. foltz, 2017/05/04 23:16:38]

s/for each device/for the interface (until disconnected)/
s/the device's/the interface's/

[btolsch, 2017/05/23 08:55:02]

Done.

+  // network.
+  std::string network_id;
+};
+
+std::vector<DiscoveryNetworkId> GetDiscoveryNetworkIdList();
+
+#endif  // CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DISCOVERY_NETWORK_LIST_H_