[Media Router] Use DialMediaSinkService in MediaRouterMojoImpl

chrome/browser/media/router/discovery/media_sink_service_base.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_MEDIA_SINK_SERVICE_BASE_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_MEDIA_SINK_SERVICE_BASE_H_
 
 #include <memory>
 #include <set>
 
 #include "base/gtest_prod_util.h"
 #include "base/timer/timer.h"
 #include "chrome/common/media_router/discovery/media_sink_internal.h"
 #include "chrome/common/media_router/discovery/media_sink_service.h"
 
 namespace media_router {
 
 class MediaSinkServiceBase : public MediaSinkService {
  public:
   explicit MediaSinkServiceBase(const OnSinksDiscoveredCallback& callback);
   ~MediaSinkServiceBase() override;
 
  protected:
   void SetTimerForTest(std::unique_ptr<base::Timer> timer);
 
   // Called when |finish_timer_| expires.
   void OnFetchCompleted();
 
-  // Helper function to start |finish_timer_|.
+  // Helper function to start |finish_timer_|. Create a new timer if none
+  // exists.
   void StartTimer();
 
-  // Timer for finishing fetching.
-  std::unique_ptr<base::Timer> finish_timer_;
+  // Helper function to stop |finish_timer_|.
+  void StopTimer();
+
+  // Helper function to restart |finish_timer|. No-op if timer does not exist or
+  // timer is currently running.
+  void RestartTimer();
 
   // Time out value for |finish_timer_|
   int fetch_complete_timeout_secs_;
 
   // Sorted sinks from current round of discovery.
   std::set<MediaSinkInternal> current_sinks_;
 
   // Sorted sinks sent to Media Router Provider in last FetchCompleted().
   std::set<MediaSinkInternal> mrp_sinks_;
 
  private:
   friend class MediaSinkServiceBaseTest;
   FRIEND_TEST_ALL_PREFIXES(MediaSinkServiceBaseTest,
                            TestFetchCompleted_SameSink);
+
+  // Timer for finishing fetching.
+  std::unique_ptr<base::Timer> finish_timer_;
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_MEDIA_SINK_SERVICE_BASE_H_