Render inband text tracks in the media pipeline

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 9594d9dbc54ee2030fbe8a2674456690eeedfb20..b4c9bc1b631668cc9476be6b0fb8bb8fd588c22f 100644
--- a/media/filters/source_buffer_stream.h
+++ b/media/filters/source_buffer_stream.h
@@ -49,6 +49,8 @@ class MEDIA_EXPORT SourceBufferStream {
                      const LogCB& log_cb);
   SourceBufferStream(const VideoDecoderConfig& video_config,
                      const LogCB& log_cb);
+  SourceBufferStream(const TextTrackConfig& text_config,
+                     const LogCB& log_cb);
 
   ~SourceBufferStream();
 
@@ -107,6 +109,7 @@ class MEDIA_EXPORT SourceBufferStream {
 
   const AudioDecoderConfig& GetCurrentAudioDecoderConfig();
   const VideoDecoderConfig& GetCurrentVideoDecoderConfig();
+  const TextTrackConfig& GetCurrentTextTrackConfig();
 
   // Notifies this object that the audio config has changed and buffers in
   // future Append() calls should be associated with this new config.
@@ -320,6 +323,9 @@ class MEDIA_EXPORT SourceBufferStream {
   std::vector<AudioDecoderConfig> audio_configs_;
   std::vector<VideoDecoderConfig> video_configs_;
 
+  // Holds the text config for this stream.
+  TextTrackConfig text_track_config_;
+
   // True if more data needs to be appended before the Seek() can complete,
   // false if no Seek() has been requested or the Seek() is completed.
   bool seek_pending_;