Fix media timeline so that thumb never exceeds buffered data

media/base/pipeline.h

Index: media/base/pipeline.h
diff --git a/media/base/pipeline.h b/media/base/pipeline.h
index b4c8d9fb7ef2ae22b985756c65a60ac6f1ec1f44..0a1cb81b4245524ff069faa288eb2fffb8231a80 100644
--- a/media/base/pipeline.h
+++ b/media/base/pipeline.h
@@ -334,7 +334,6 @@ class MEDIA_EXPORT Pipeline
   virtual void SetError(PipelineStatus error) OVERRIDE;
   virtual base::TimeDelta GetTime() const OVERRIDE;
   virtual base::TimeDelta GetDuration() const OVERRIDE;
-  virtual void SetTime(base::TimeDelta time) OVERRIDE;
   virtual void SetNaturalVideoSize(const gfx::Size& size) OVERRIDE;
   virtual void NotifyEnded() OVERRIDE;
   virtual void DisableAudioRenderer() OVERRIDE;
@@ -354,6 +353,12 @@ class MEDIA_EXPORT Pipeline
   // Callback executed by filters to update statistics.
   void OnUpdateStatistics(const PipelineStatistics& stats);
 
+  // Callback executed by audio renderer to update clock time.
+  void OnAudioTimeUpdate(base::TimeDelta time, base::TimeDelta max_time);
+
+  // Callback executed by video renderer to update clock time.
+  void OnVideoTimeUpdate(base::TimeDelta max_time);
+
   // 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.
@@ -504,9 +509,6 @@ class MEDIA_EXPORT Pipeline
   // Whether or not a playback rate change should be done once seeking is done.
   bool playback_rate_change_pending_;
 
-  // Duration of the media in microseconds.  Set by filters.
-  base::TimeDelta duration_;
-
   // Amount of available buffered data in microseconds.  Set by filters.
   base::TimeDelta buffered_time_;