Render inband text tracks in the media pipeline

media/filters/fake_demuxer_stream.cc

Index: media/filters/fake_demuxer_stream.cc
diff --git a/media/filters/fake_demuxer_stream.cc b/media/filters/fake_demuxer_stream.cc
index 200b287b0301477463987428a8a47f94f1dd856e..bf6103539ce20960becc386be4898411cc682352 100644
--- a/media/filters/fake_demuxer_stream.cc
+++ b/media/filters/fake_demuxer_stream.cc
@@ -12,6 +12,7 @@
 #include "media/base/bind_to_loop.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/test_helpers.h"
+#include "media/base/text_track.h"
 #include "media/base/video_frame.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
@@ -70,6 +71,11 @@ VideoDecoderConfig FakeDemuxerStream::video_decoder_config() {
   return video_decoder_config_;
 }
 
+TextTrackConfig FakeDemuxerStream::text_track_config() {
+  DCHECK(message_loop_->BelongsToCurrentThread());
+  return TextTrackConfig();
+}
+
 // TODO(xhwang): Support audio if needed.
 DemuxerStream::Type FakeDemuxerStream::type() {
   DCHECK(message_loop_->BelongsToCurrentThread());