[Media, Video] Update WMPI when the pipeline gets a new average keyframe distance.

media/base/pipeline_impl.h

 // Copyright (c) 2016 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 MEDIA_BASE_PIPELINE_IMPL_H_
 #define MEDIA_BASE_PIPELINE_IMPL_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 117 matching lines @@
   void OnError(PipelineStatus error);
   void OnEnded();
   void OnMetadata(PipelineMetadata metadata);
   void OnBufferingStateChange(BufferingState state);
   void OnDurationChange(base::TimeDelta duration);
   void OnAddTextTrack(const TextTrackConfig& config,
                       const AddTextTrackDoneCB& done_cb);
   void OnWaitingForDecryptionKey();
   void OnVideoNaturalSizeChange(const gfx::Size& size);
   void OnVideoOpacityChange(bool opaque);
+  void OnVideoAverageKeyframeDistanceUpdate();
 
   // Task completion callbacks from RendererWrapper.
   void OnSeekDone();
   void OnSuspendDone();
 
   // Parameters passed in the constructor.
   const scoped_refptr<base::SingleThreadTaskRunner> media_task_runner_;
   const scoped_refptr<MediaLog> media_log_;
 
   // Pipeline client. Valid only while the pipeline is running.
@@ skipping 32 matching lines @@
 
   base::ThreadChecker thread_checker_;
   base::WeakPtrFactory<PipelineImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PipelineImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_IMPL_H_