[Media Router] Add DialMediaSinkService and DeviceDescriptionService

chrome/browser/media/router/discovery/dial/device_description_fetcher.h

 // 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_DIAL_DEVICE_DESCRIPTION_FETCHER_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DIAL_DEVICE_DESCRIPTION_FETCHER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 25 matching lines @@
   // |request_context| is unowned; the caller must ensure that this object does
   // not outlive it.
   DeviceDescriptionFetcher(
       const GURL& device_description_url,
       net::URLRequestContextGetter* request_context,
       base::OnceCallback<void(const DialDeviceDescriptionData&)> success_cb,
       base::OnceCallback<void(const std::string&)> error_cb);
 
   ~DeviceDescriptionFetcher() override;
 
+  const GURL& device_description_url() { return device_description_url_; }
+
   void Start();
 
  private:
   // net::URLFetcherDelegate implementation.
   void OnURLFetchComplete(const net::URLFetcher* source) override;
   void OnURLFetchDownloadProgress(const net::URLFetcher* source,
                                   int64_t current,
                                   int64_t total,
                                   int64_t current_network_bytes) override;
   void OnURLFetchUploadProgress(const net::URLFetcher* source,
                                 int64_t current,
                                 int64_t total) override;
 
   // Runs |error_cb_| with |message| and clears it.
   void ReportError(const std::string& message);
 
   const GURL device_description_url_;
   const scoped_refptr<net::URLRequestContextGetter> request_context_;
   base::ThreadChecker thread_checker_;
 
   base::OnceCallback<void(const DialDeviceDescriptionData&)> success_cb_;
   base::OnceCallback<void(const std::string&)> error_cb_;
   std::unique_ptr<net::URLFetcher> fetcher_;
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DIAL_DEVICE_DESCRIPTION_FETCHER_H_