Add DiscoveryNetworkMonitor implementation

chrome/browser/extensions/api/dial/dial_api.h

 // Copyright (c) 2012 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_EXTENSIONS_API_DIAL_DIAL_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_DIAL_DIAL_API_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "chrome/browser/extensions/api/dial/dial_device_data.h"
 #include "chrome/browser/extensions/api/dial/dial_registry.h"
+#include "chrome/browser/net/discovery_network_monitor.h"
 #include "chrome/common/extensions/api/dial.h"
 #include "components/keyed_service/core/refcounted_keyed_service.h"
 #include "extensions/browser/api/async_api_function.h"
 #include "extensions/browser/event_router.h"
 
 namespace extensions {
 
 namespace api {
 namespace dial {
 class DeviceDescriptionFetcher;
@@ skipping 127 matching lines @@
 
   std::unique_ptr<api::dial::FetchDeviceDescription::Params> params_;
   std::unique_ptr<api::dial::DeviceDescriptionFetcher>
       device_description_fetcher_;
 
   DialAPI* dial_;
 
   DISALLOW_COPY_AND_ASSIGN(DialFetchDeviceDescriptionFunction);
 };
 
+class DialGetNetworkIdFunction : public AsyncExtensionFunction {

[imcheng, 2017/03/14 22:45:34]

Mark - I don't believe we need this anymore. The network change monitor will
only be used in browser code. Is that correct?

[mark a. foltz, 2017/03/18 19:58:21]

It's up to you - if we add this, we could test it in the current component (and
possibly get performance benefits by removing other event listeners.

[btolsch, 2017/04/03 10:16:35]

I removee it since it sounds like it would only be used temporarily.

+ public:
+  DialGetNetworkIdFunction();
+
+ protected:
+  ~DialGetNetworkIdFunction() override;
+
+  // AsyncExtensionFunction:
+  bool RunAsync() override;
+
+ private:
+  DECLARE_EXTENSION_FUNCTION("dial.getNetworkId", DIAL_GETNETWORKID)
+
+  void GetNetworkIdOnIOThread();
+  void NetworkIdCallback();
+
+  DISALLOW_COPY_AND_ASSIGN(DialGetNetworkIdFunction);
+};
+
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DIAL_DIAL_API_H_