Media Source dispatches inband text tracks

media/base/pipeline_status.h

Index: media/base/pipeline_status.h
diff --git a/media/base/pipeline_status.h b/media/base/pipeline_status.h
index c208d01d583b0b971668ed13c8dd3941782e1adc..494972c180df2e949ec2f8b467e48f527a5e25c7 100644
--- a/media/base/pipeline_status.h
+++ b/media/base/pipeline_status.h
@@ -60,6 +60,21 @@ struct PipelineStatistics {
 // Used for updating pipeline statistics.
 typedef base::Callback<void(const PipelineStatistics&)> StatisticsCB;
 
+// Specifies the varieties of text tracks.
+enum TextKind {
+  kTextSubtitles,
+  kTextCaptions,
+  kTextDescriptions,
+  kTextMetadata,
+  kTextNone
+};
+
+// So pipeline can notify media player about presence of text tracks.
+// TODO(matthewjheaney): Might have to also include track number, etc.
+typedef base::Callback<void(TextKind kind,
+                            const std::string& label,
+                            const std::string& language)> TextTrackCB;
+
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_STATUS_H_