Add HE AAC support to ISO BMFF.

media/mp4/mp4_stream_parser.h

Index: media/mp4/mp4_stream_parser.h
diff --git a/media/mp4/mp4_stream_parser.h b/media/mp4/mp4_stream_parser.h
index a830536844b0310ff905de784a709882345e87f6..93c9b319350d4b5eab2e41c2389ea4fde5a131c7 100644
--- a/media/mp4/mp4_stream_parser.h
+++ b/media/mp4/mp4_stream_parser.h
@@ -11,6 +11,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "media/base/media_export.h"
 #include "media/base/stream_parser.h"
+#include "media/mp4/aac.h"
 #include "media/mp4/offset_byte_queue.h"
 #include "media/mp4/track_run_iterator.h"
 
@@ -84,6 +85,10 @@ class MEDIA_EXPORT MP4StreamParser : public StreamParser {
   uint32 audio_track_id_;
   uint32 video_track_id_;
 
+  // We keep them around to avoid having to go digging through the moov with
+  // every frame.
+  AAC aac_;
+
   DISALLOW_COPY_AND_ASSIGN(MP4StreamParser);
 };