Add an initial revision of an audio server.

mojo/services/media/audio/interfaces/audio_server.mojom

Index: mojo/services/media/audio/interfaces/audio_server.mojom
diff --git a/mojo/public/interfaces/network/network_error.mojom b/mojo/services/media/audio/interfaces/audio_server.mojom
similarity index 54%
copy from mojo/public/interfaces/network/network_error.mojom
copy to mojo/services/media/audio/interfaces/audio_server.mojom
index d1f741d6bb13a8f77e1f6c4f106131665e693259..9082dff54e3a9d338a36b84b0afde9e17d6fca40 100644
--- a/mojo/public/interfaces/network/network_error.mojom
+++ b/mojo/services/media/audio/interfaces/audio_server.mojom
@@ -2,12 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-[DartPackage="mojo"]
-module mojo;
+module mojo.media;
 
-struct NetworkError {
-  int32 code;
-  string? description;
-};
+import "mojo/services/media/audio/interfaces/audio_track.mojom";
 
+interface AudioServer {
+  CreateTrack(AudioTrack& track);
+};