Assign correct track ids to buffers emitted from StreamParsers

media/formats/mp2t/es_parser_h264.cc

Index: media/formats/mp2t/es_parser_h264.cc
diff --git a/media/formats/mp2t/es_parser_h264.cc b/media/formats/mp2t/es_parser_h264.cc
index 871a70de7de5e7d226b32d017ce31a5b7afa9ea8..7f112f05d704e0ec497e4f72c96a9ff8f6dc8a6e 100644
--- a/media/formats/mp2t/es_parser_h264.cc
+++ b/media/formats/mp2t/es_parser_h264.cc
@@ -279,12 +279,8 @@ bool EsParserH264::EmitFrame(int64_t access_unit_pos,
   // TODO(wolenetz/acolwell): Validate and use a common cross-parser TrackId
   // type and allow multiple video tracks. See https://crbug.com/341581.
   scoped_refptr<StreamParserBuffer> stream_parser_buffer =
-      StreamParserBuffer::CopyFrom(
-          es,
-          access_unit_size,
-          is_key_frame,
-          DemuxerStream::VIDEO,
-          0);
+      StreamParserBuffer::CopyFrom(es, access_unit_size, is_key_frame,
+                                   DemuxerStream::VIDEO, kMp2tVideoTrackId);
   stream_parser_buffer->SetDecodeTimestamp(current_timing_desc.dts);
   stream_parser_buffer->set_timestamp(current_timing_desc.pts);
   return es_adapter_.OnNewBuffer(stream_parser_buffer);