MSE: Log buffered audio splice generation to media-internals

media/filters/source_buffer_stream.h

Index: media/filters/source_buffer_stream.h
diff --git a/media/filters/source_buffer_stream.h b/media/filters/source_buffer_stream.h
index b4063602c8745da415735db688457f1a9c6b20a7..6f35060de9c565819fdd681dd593d0386203630e 100644
--- a/media/filters/source_buffer_stream.h
+++ b/media/filters/source_buffer_stream.h
@@ -328,6 +328,10 @@ class MEDIA_EXPORT SourceBufferStream {
   // appropriately and returns true.  Otherwise returns false.
   bool SetPendingBuffer(scoped_refptr<StreamParserBuffer>* out_buffer);
 
+  // Update |splice_stats_| and log the update to |media_log_|.
+  void LogSplice(double splice_duration);
+  void LogDegenerateSplice();
+
   // Used to report log messages that can help the web developer figure out what
   // is wrong with the content.
   scoped_refptr<MediaLog> media_log_;
@@ -419,6 +423,11 @@ class MEDIA_EXPORT SourceBufferStream {
   // Indicates that splice frame generation is enabled.
   const bool splice_frames_enabled_;
 
+  // Buffered audio splice generation statistics for reporting to |media_log_|.
+  // TODO(wolenetz,chcunningham): Once multi-track audio is enabled, report
+  // these statistics per track.
+  MediaLog::AudioSpliceStatistics splice_stats_;
+
   DISALLOW_COPY_AND_ASSIGN(SourceBufferStream);
 };