Remove Media.UnderflowCount, add Media.UnderflowDuration for MSE.

media/blink/webmediaplayer_impl.h

 // Copyright 2013 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_BLINK_WEBMEDIAPLAYER_IMPL_H_
 #define MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 428 matching lines @@
   // Overrides the pipeline media duration returned by
   // GetPipelineMediaDuration() for tests.
   void SetPipelineMediaDurationForTest(base::TimeDelta duration);
 
   // Return the pipeline media duration or the value overridden by tests.
   base::TimeDelta GetPipelineMediaDuration() const;
 
   void ReportTimeFromForegroundToFirstFrame(base::TimeTicks foreground_time,
                                             base::TimeTicks new_frame_time);
 
+  // Records |duration| to the appropriate metric based on whether we're
+  // handling a src= or MSE based playback.
+  void RecordUnderflowDuration(base::TimeDelta duration);
+
   blink::WebLocalFrame* frame_;
 
   // The playback state last reported to |delegate_|, to avoid setting duplicate
   // states.
   // TODO(sandersd): The delegate should be implementing deduplication.
   DelegateState delegate_state_;
   bool delegate_has_audio_;
 
   blink::WebMediaPlayer::NetworkState network_state_;
   blink::WebMediaPlayer::ReadyState ready_state_;
@@ skipping 193 matching lines @@
   bool use_fallback_path_;
 
   // Called sometime after the media is suspended in a playing state in
   // OnFrameHidden(), causing the state to change to paused.
   base::OneShotTimer background_pause_timer_;
 
   // Monitors the watch time of the played content.
   std::unique_ptr<WatchTimeReporter> watch_time_reporter_;
   bool is_encrypted_;
 
-  // Number of times we've reached BUFFERING_HAVE_NOTHING during playback.
-  int underflow_count_;
+  // Elapsed time since we've last reached BUFFERING_HAVE_NOTHING.
   std::unique_ptr<base::ElapsedTimer> underflow_timer_;
 
   // Used to track loading progress, used by IsPrerollAttemptNeeded().
   // |preroll_attempt_pending_| indicates that the clock has been reset
   // (awaiting a resume to start), while |preroll_attempt_start_time_| tracks
   // when a preroll attempt began.
   bool preroll_attempt_pending_;
   base::TimeTicks preroll_attempt_start_time_;
 
   std::unique_ptr<base::TickClock> tick_clock_;
@@ skipping 25 matching lines @@
 
   // Pipeline media duration overridden by tests.
   base::Optional<base::TimeDelta> pipeline_media_duration_for_test_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_