Render inband text tracks in the media pipeline

media/base/demuxer_stream.h

Index: media/base/demuxer_stream.h
diff --git a/media/base/demuxer_stream.h b/media/base/demuxer_stream.h
index bb4534475ed14099c92a2cfec0ffb75e2f18584a..2220d4c1571ea963c40fbb5864e6d4d23ff52a20 100644
--- a/media/base/demuxer_stream.h
+++ b/media/base/demuxer_stream.h
@@ -13,6 +13,7 @@ namespace media {
 
 class AudioDecoderConfig;
 class DecoderBuffer;
+class TextTrackConfig;
 class VideoDecoderConfig;
 
 class MEDIA_EXPORT DemuxerStream {
@@ -21,6 +22,7 @@ class MEDIA_EXPORT DemuxerStream {
     UNKNOWN,
     AUDIO,
     VIDEO,
+    TEXT,
     NUM_TYPES,  // Always keep this entry as the last one!
   };