Add mojo interface+impl for audio stream control.

media/mojo/interfaces/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//mojo/public/tools/bindings/mojom.gni")
 
 mojom("interfaces") {
   sources = [
     "audio_decoder.mojom",
-    "audio_output.mojom",
+    "audio_output_stream.mojom",
     "audio_parameters.mojom",
     "content_decryption_module.mojom",
     "decryptor.mojom",
     "demuxer_stream.mojom",
     "interface_factory.mojom",
     "media_service.mojom",
     "media_types.mojom",
     "output_protection.mojom",
     "provision_fetcher.mojom",
     "renderer.mojom",
@@ skipping 11 matching lines @@
     "//ui/gfx/geometry/mojo",
     "//url/mojo:url_mojom_gurl",
   ]
 }
 
 mojom("remoting") {
   sources = [
     "remoting.mojom",
   ]
 }