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

media/base/pipeline.h

 // Copyright (c) 2012 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_H_
 #define MEDIA_BASE_PIPELINE_H_
 
 #include <memory>
 
 #include "base/memory/ref_counted.h"
@@ skipping 44 matching lines @@
                                 const AddTextTrackDoneCB& done_cb) = 0;
 
     // Executed whenever the key needed to decrypt the stream is not available.
     virtual void OnWaitingForDecryptionKey() = 0;
 
     // Executed for the first video frame and whenever natural size changes.
     virtual void OnVideoNaturalSizeChange(const gfx::Size& size) = 0;
 
     // Executed for the first video frame and whenever opacity changes.
     virtual void OnVideoOpacityChange(bool opaque) = 0;
+
+    // Executed when the average keyframe distance for the video changes.
+    virtual void OnVideoAverageKeyframeDistanceUpdate() = 0;
   };
 
   virtual ~Pipeline() {}
 
   // Build a pipeline to using the given |demuxer| and |renderer| to construct
   // a filter chain, executing |seek_cb| when the initial seek has completed.
   // Methods on PipelineClient may be called up until Stop() has completed.
   // It is an error to call this method after the pipeline has already started.
   virtual void Start(Demuxer* demuxer,
                      std::unique_ptr<Renderer> renderer,
@@ skipping 91 matching lines @@
   // Gets the current pipeline statistics.
   virtual PipelineStatistics GetStatistics() const = 0;
 
   virtual void SetCdm(CdmContext* cdm_context,
                       const CdmAttachedCB& cdm_attached_cb) = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_H_