Re-add AC3/EAC3 audio demuxing support

media/formats/mp4/mp4_stream_parser_unittest.cc

Index: media/formats/mp4/mp4_stream_parser_unittest.cc
diff --git a/media/formats/mp4/mp4_stream_parser_unittest.cc b/media/formats/mp4/mp4_stream_parser_unittest.cc
index c82d67bf6302c9b9aea824cc13bd79bf745ab801..a13942762f8c5bf49819f28690dd6291177aceba 100644
--- a/media/formats/mp4/mp4_stream_parser_unittest.cc
+++ b/media/formats/mp4/mp4_stream_parser_unittest.cc
@@ -246,5 +246,21 @@ TEST_F(MP4StreamParserTest, VideoSamplesStartWithAUDs) {
 // TODO(strobe): Create and test media which uses CENC auxiliary info stored
 // inside a private box
 
+#if defined(ENABLE_AC3_EAC3_AUDIO_DEMUXING)
+TEST_F(MP4StreamParserTest, DemuxingAC3) {
+  std::set<int> audio_object_types;
+  audio_object_types.insert(kAC3);
+  parser_.reset(new MP4StreamParser(audio_object_types, false));
+  ParseMP4File("bear-ac3-frag.mp4", 512);
+}
+
+TEST_F(MP4StreamParserTest, DemuxingEAC3) {
+  std::set<int> audio_object_types;
+  audio_object_types.insert(kEAC3);
+  parser_.reset(new MP4StreamParser(audio_object_types, false));
+  ParseMP4File("bear-eac3-frag.mp4", 512);
+}
+#endif
+
 }  // namespace mp4
 }  // namespace media