Adds method to provide custom AudioManager at runtime.

media/audio/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/linux/pkg_config.gni")
 import("//media/media_options.gni")
 
 # When libpulse is not directly linked, use stubs to allow for dlopening of the
 # binary.
 if (!link_pulseaudio) {
@@ skipping 252 matching lines @@
     "//testing/gmock",
   ]
   configs += [ "//media:media_config" ]
 }
 
 source_set("unittests") {
   testonly = true
   sources = [
     "audio_input_controller_unittest.cc",
     "audio_input_unittest.cc",
+    "audio_manager_factory_unittest.cc",
     "audio_manager_unittest.cc",
     "audio_output_controller_unittest.cc",
     "audio_output_device_unittest.cc",
     "audio_output_proxy_unittest.cc",
     "audio_parameters_unittest.cc",
     "audio_power_monitor_unittest.cc",
     "fake_audio_worker_unittest.cc",
     "simple_sources_unittest.cc",
     "virtual_audio_input_stream_unittest.cc",
     "virtual_audio_output_stream_unittest.cc",
@@ skipping 50 matching lines @@
     ]
   }
 
   if (use_alsa) {
     sources += [
       "alsa/alsa_output_unittest.cc",
       "audio_low_latency_input_output_unittest.cc",
     ]
   }
 }