Basic media tracks implementation for media stream parsers

media/formats/webm/webm_stream_parser.cc

Index: media/formats/webm/webm_stream_parser.cc
diff --git a/media/formats/webm/webm_stream_parser.cc b/media/formats/webm/webm_stream_parser.cc
index e36a972adec9a0a954bc2bff6550cb2fa7930390..aece4a4f82a3f7f7870b6505de94619fd8b4d9e8 100644
--- a/media/formats/webm/webm_stream_parser.cc
+++ b/media/formats/webm/webm_stream_parser.cc
@@ -9,6 +9,8 @@
 #include "base/callback.h"
 #include "base/callback_helpers.h"
 #include "base/logging.h"
+#include "media/base/media_track.h"
+#include "media/base/media_tracks.h"
 #include "media/base/timestamp_constants.h"
 #include "media/formats/webm/webm_cluster_parser.h"
 #include "media/formats/webm/webm_constants.h"
@@ -222,9 +224,14 @@ int WebMStreamParser::ParseInfoAndTracks(const uint8_t* data, int size) {
   if (video_config.is_encrypted())
     OnEncryptedMediaInitData(tracks_parser.video_encryption_key_id());
 
-  if (!config_cb_.Run(audio_config,
-                      video_config,
-                      tracks_parser.text_tracks())) {
+  scoped_ptr<MediaTracks> media_tracks(new MediaTracks());

[wolenetz, 2016/02/26 00:06:21]

ditto: TODO+crbug for sourcing inband track attributes; this time for webm:
https://dev.w3.org/html5/html-sourcing-inband-tracks/#webm

[servolk, 2016/02/26 01:56:33]

Done.

+  if (audio_config.IsValidConfig()) {
+    media_tracks->AddAudioTrack(audio_config, "audio", "", "", "");
+  }
+  if (video_config.IsValidConfig()) {
+    media_tracks->AddVideoTrack(video_config, "video", "", "", "");
+  }
+  if (!config_cb_.Run(std::move(media_tracks), tracks_parser.text_tracks())) {
     DVLOG(1) << "New config data isn't allowed.";
     return -1;
   }