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..f2a67325ef1e4979d1609457cd105caf9c3b3cd7
--- /dev/null
+++ b/chrome/browser/media/router/discovery/discovery_network_list.h
@@ -0,0 +1,22 @@
+// 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 ethernet, this will simply be the ethernet adapter's MAC

[mark a. foltz, 2017/04/26 22:25:11]

The SSID identifies a network, while the MAC address identifies a device.  You
might clarify the two cases:

"For WiFi, we assume that the SSID identifies the connected network.  For
Ethernet, we assume the network remains the same for a given device, so we use
its MAC address."

[btolsch, 2017/05/03 22:03:09]

Done.

+  // address, for Wifi it will be the associated SSID.
+  std::string network_id;
+};
+
+std::vector<DiscoveryNetworkId> GetDiscoveryNetworkIdList();
+
+#endif  // CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DISCOVERY_NETWORK_LIST_H_