[Media Router] Add DialMediaSinkService and DeviceDescriptionService

chrome/browser/extensions/api/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_EXTENSIONS_API_DIAL_DEVICE_DESCRIPTION_FETCHER_H_
 #define CHROME_BROWSER_EXTENSIONS_API_DIAL_DEVICE_DESCRIPTION_FETCHER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 27 matching lines @@
   // not outlive it.
   DeviceDescriptionFetcher(
       const GURL& device_description_url,
       net::URLRequestContextGetter* request_context,
       content::BrowserThread::ID thread_id,
       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,
@@ skipping 10 matching lines @@
   base::OnceCallback<void(const DialDeviceDescriptionData&)> success_cb_;
   base::OnceCallback<void(const std::string&)> error_cb_;
   std::unique_ptr<net::URLFetcher> fetcher_;
 };
 
 }  // namespace dial
 }  // namespace api
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DIAL_DEVICE_DESCRIPTION_FETCHER_H_