Convert Filter::Seek() to use new callback system.

media/base/pipeline_impl.h

 // Copyright (c) 2011 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.
 
 // Implementation of Pipeline & PipelineStatusNotification (an async-to-sync
 // callback adapter).
 
 #ifndef MEDIA_BASE_PIPELINE_IMPL_H_
 #define MEDIA_BASE_PIPELINE_IMPL_H_
 
@@ skipping 187 matching lines @@
   virtual void SetLoaded(bool loaded);
   virtual void SetNetworkActivity(bool network_activity);
   virtual void NotifyEnded();
   virtual void DisableAudioRenderer();
   virtual void SetCurrentReadPosition(int64 offset);
   virtual int64 GetCurrentReadPosition();
 
   // Callback executed by filters upon completing initialization.
   void OnFilterInitialize();
 
-  // Callback executed by filters upon completing Play(), Pause(), Seek(),
-  // or Stop().
+  // Callback executed by filters upon completing Play(), Pause(), or Stop().
   void OnFilterStateTransition();
 
+  // Callback executed by filters upon completing Seek().
+  void OnFilterStateTransitionWithStatus(PipelineStatus status);
+
   // Callback executed by filters when completing teardown operations.
   void OnTeardownStateTransition();
 
   // Callback executed by filters to update statistics.
   void OnUpdateStatistics(const PipelineStatistics& stats);
 
   // The following "task" methods correspond to the public methods, but these
   // methods are run as the result of posting a task to the PipelineInternal's
   // message loop.
   void StartTask(FilterCollection* filter_collection,
@@ skipping 231 matching lines @@
   PipelineStatistics statistics_;
 
   FRIEND_TEST_ALL_PREFIXES(PipelineImplTest, GetBufferedTime);
 
   DISALLOW_COPY_AND_ASSIGN(PipelineImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_IMPL_H_