Add mojo interface+impl for audio stream control.

media/base/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("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/config/linux/pkg_config.gni")
 import("//media/media_options.gni")
@@ skipping 46 matching lines @@
     "audio_decoder.cc",
     "audio_decoder.h",
     "audio_decoder_config.cc",
     "audio_decoder_config.h",
     "audio_discard_helper.cc",
     "audio_discard_helper.h",
     "audio_fifo.cc",
     "audio_fifo.h",
     "audio_hash.cc",
     "audio_hash.h",
+    "audio_output_delegate.h",
     "audio_pull_fifo.cc",
     "audio_pull_fifo.h",
     "audio_push_fifo.cc",
     "audio_push_fifo.h",
     "audio_renderer.cc",
     "audio_renderer.h",
     "audio_renderer_mixer.cc",
     "audio_renderer_mixer.h",
     "audio_renderer_mixer_input.cc",
     "audio_renderer_mixer_input.h",
@@ skipping 454 matching lines @@
 
 fuzzer_test("media_container_names_fuzzer") {
   sources = [
     "container_names_fuzzertest.cc",
   ]
   deps = [
     "//base",
     "//media",
   ]
 }