Add DiscoveryNetworkMonitor implementation

chrome/browser/media/router/BUILD.gn

 # Copyright 2015 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.
 #
 
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
 static_library("router") {
   deps = [
     "//base",
     "//chrome/common:constants",
     "//components/keyed_service/content",
     "//components/keyed_service/core",
     "//content/public/browser",
     "//content/public/common",
     "//third_party/icu",
     "//url",
   ]
   sources = [
     "browser_presentation_connection_proxy.cc",
     "browser_presentation_connection_proxy.h",
     "create_presentation_connection_request.cc",
     "create_presentation_connection_request.h",
+    "discovery/discovery_network_list.h",
+    "discovery/discovery_network_list_posix.cc",
+    "discovery/discovery_network_list_wifi.h",
+    "discovery/discovery_network_list_wifi_linux.cc",
+    "discovery/discovery_network_monitor.cc",
+    "discovery/discovery_network_monitor.h",
     "issue.cc",
     "issue.h",
     "issue_manager.cc",
     "issue_manager.h",
     "issues_observer.cc",
     "issues_observer.h",
     "media_route.cc",
     "media_route.h",
     "media_router.h",
     "media_router_base.cc",
@@ skipping 93 matching lines @@
     deps += [
       ":mojo_bindings",
       "//extensions/common",
     ]
     sources += [
       "mojo/media_router_mojo_test.cc",
       "mojo/media_router_mojo_test.h",
     ]
   }
 }