Add a mojo implementation of AudioOutputIPC.

content/test/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/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
@@ skipping 1395 matching lines @@
     "../renderer/ico_image_decoder_unittest.cc",
     "../renderer/input/input_event_filter_unittest.cc",
     "../renderer/input/main_thread_event_queue_unittest.cc",
     "../renderer/manifest/manifest_parser_unittest.cc",
     "../renderer/media/android/media_info_loader_unittest.cc",
     "../renderer/media/audio_message_filter_unittest.cc",
     "../renderer/media/audio_renderer_mixer_manager_unittest.cc",
     "../renderer/media/audio_renderer_sink_cache_unittest.cc",
     "../renderer/media/mock_audio_device_factory.cc",
     "../renderer/media/mock_audio_device_factory.h",
+    "../renderer/media/mojo_audio_output_ipc_unittest.cc",
     "../renderer/media/render_media_log_unittest.cc",
     "../renderer/media/renderer_webaudiodevice_impl_unittest.cc",
     "../renderer/media/video_capture_impl_manager_unittest.cc",
     "../renderer/media/video_capture_impl_unittest.cc",
     "../renderer/media/webmediaplayer_ms_unittest.cc",
     "../renderer/peripheral_content_heuristic_unittest.cc",
     "../renderer/presentation/presentation_connection_proxy_unittest.cc",
     "../renderer/presentation/presentation_dispatcher_unittest.cc",
     "../renderer/presentation/test_presentation_connection.cc",
     "../renderer/presentation/test_presentation_connection.h",
@@ skipping 439 matching lines @@
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]
   }
 }
 
 group("fuzzers") {
   deps = [
     "//content/test/fuzzer",
   ]
 }