Add DiscoveryNetworkMonitor implementation

chrome/test/BUILD.gn

 # Copyright 2014 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("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
@@ skipping 3607 matching lines @@
       "../test/base/browser_with_test_window_test.cc",
       "../test/base/browser_with_test_window_test.h",
       "../utility/importer/bookmark_html_reader_unittest.cc",
       "../utility/importer/bookmarks_file_importer_unittest.cc",
       "../utility/importer/edge_database_reader_unittest_win.cc",
       "../utility/importer/firefox_importer_unittest.cc",
       "../utility/importer/firefox_importer_unittest_messages_internal.h",
       "../utility/importer/firefox_importer_unittest_utils.h",
       "../utility/importer/firefox_importer_unittest_utils_mac.cc",
       "../utility/importer/safari_importer_unittest.mm",
+
+      # In-browser discovery is not used by Android for now.

[Lei Zhang, 2017/06/08 20:53:47]

Please don't pile these at the bottom. Keep the list sorted.

+      "../browser/media/router/discovery/discovery_network_list_unittest.cc",
+      "../browser/media/router/discovery/discovery_network_monitor_unittest.cc",
     ]
     sources -=
         [ "../browser/download/download_request_infobar_delegate_unittest.cc" ]
     deps += [
       "//ipc",
       "//third_party/libaddressinput",
     ]
   }
 
   if (!is_android) {
@@ skipping 1419 matching lines @@
 }
 
 if (is_win) {
   loadable_module("conflicts_dll") {
     testonly = true
     sources = [
       "conflicts/conflicts_dll.cc",
     ]
   }
 }