Trigger MSE players UMA by user events only

media/base/android/media_statistics.h

 // Copyright 2015 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_ANDROID_MEDIA_STATISTICS_H_
 #define MEDIA_BASE_ANDROID_MEDIA_STATISTICS_H_
 
 #include <stdint.h>
 #include "base/time/time.h"
 #include "media/base/demuxer_stream.h"
@@ skipping 39 matching lines @@
  public:
   MediaStatistics();
   ~MediaStatistics();
 
   // Returns the frame statistics for audio frames.
   FrameStatistics& audio_frame_stats() { return audio_frame_stats_; }
 
   // Returns the frame statistics for video frames.
   FrameStatistics& video_frame_stats() { return video_frame_stats_; }
 
-  // Starts gathering statistics. When called in a row only the firts call will
+  // Starts gathering statistics. When called in a row only the first call will
   // take effect.
   void Start(base::TimeDelta current_playback_time);
 
   // Stops gathering statistics, calculate and report results. When called
-  // in a row only the firts call will take effect.
+  // in a row only the first call will take effect.
   void StopAndReport(base::TimeDelta current_playback_time);
 
   // Adds starvation event. Starvation happens when the player interrupts
   // the regular playback and asks for more data.
   void AddStarvation() { ++num_starvations_; }
 
  private:
   // Resets the data to the initial state.
   void Clear();
 
   // Calculates relative data based on total frame numbers and reports it and
   // the duration to UMA.
   void Report(base::TimeDelta duration);
 
   base::TimeDelta start_time_ = kNoTimestamp();
   FrameStatistics audio_frame_stats_;
   FrameStatistics video_frame_stats_;
   uint32_t num_starvations_ = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_ANDROID_MEDIA_STATISTICS_H_