[Media Router] Add DialMediaSinkService and DeviceDescriptionService

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

+// Copyright 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_DIAL_MEDIA_SINK_SERVICE_H_
+#define CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DIAL_DIAL_MEDIA_SINK_SERVICE_H_
+
+#include <memory>
+
+#include "chrome/browser/media/router/discovery/dial/device_description_service.h"
+#include "chrome/browser/media/router/discovery/dial/dial_registry.h"
+#include "chrome/browser/media/router/discovery/media_sink_internal.h"
+#include "chrome/browser/media/router/media_sink_service.h"
+
+namespace content {
+class BrowserContext;
+}
+
+namespace media_router {
+
+class DeviceDescriptionService;
+class DialMediaSinkCacheService;
+class DialRegistry;
+
+class DialMediaSinkService : public MediaSinkService,
+                             public DialRegistry::Observer {
+ public:
+  DialMediaSinkService(const OnSinksDiscoveredCallback& callback,
+                       content::BrowserContext* browser_context);
+  ~DialMediaSinkService() override;
+
+  // MediaSinkService implementation
+  void Start() override;
+  void AddSinkQuery(MediaSinksObserver* observer) override;
+  void RemoveSinkQuery(MediaSinksObserver* observer) override;
+
+  void Stop();
+
+ protected:
+  virtual DialRegistry* dial_registry();
+  virtual DeviceDescriptionService* description_service();
+  virtual DialMediaSinkCacheService* cache_service();
+
+ private:
+  friend class DialMediaSinkServiceTest;
+  FRIEND_TEST_ALL_PREFIXES(DialMediaSinkServiceTest, TestStart);
+  FRIEND_TEST_ALL_PREFIXES(DialMediaSinkServiceTest, TestFetchCompleted);
+  FRIEND_TEST_ALL_PREFIXES(DialMediaSinkServiceTest, TestIsDifferent);
+
+  // api::dial::DialRegistry::Observer implementation
+  void OnDialDeviceEvent(const DialRegistry::DeviceList& devices) override;
+  void OnDialError(DialRegistry::DialErrorCode type) override;
+
+  // Called when fails to fetch or parse device description xml.
+  void OnDeviceDescriptionError(const std::string& device_label,
+                                const std::string& error_message);
+
+  // Called when |finish_timer_| expires.
+  void FetchCompleted();
+
+  // Returns true if |new_sink| is the same as |old_sinks|.

[mark a. foltz, 2017/04/12 00:17:18]

s/new_sink/new_sinks/

The comment and the name of the method don't match up.

[zhaobin, 2017/04/18 06:58:27]

Done.

+  bool IsDifferent(const std::vector<MediaSinkInternal> new_sinks,
+                   const std::vector<MediaSinkInternal> old_sinks);
+
+  // Timer for finishing fetching.
+  base::OneShotTimer finish_timer_;
+
+  std::unique_ptr<DeviceDescriptionService> description_service_;
+  std::unique_ptr<DialMediaSinkCacheService> cache_service_;
+
+  // Sinks sent to Media Router Provider in last FetchCompleted().
+  std::vector<MediaSinkInternal> mrp_sinks_;
+
+  bool network_disconnected_;
+
+  content::BrowserContext* browser_context_;
+  net::URLRequestContextGetter* request_context_;
+};
+
+}  // namespace media_router
+
+#endif  // CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DIAL_DIAL_MEDIA_SINK_SERVICE_H_