Add play test.

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 332 matching lines @@
     "//media:media_config",
   ]
 
   if (is_android) {
     sources += [ "android/audio_android_unittest.cc" ]
     deps += [ "//ui/gl" ]
   }
 
   if (is_mac) {
     sources += [
+      "audio_low_latency_input_output_unittest.cc",
       "mac/audio_auhal_mac_unittest.cc",
       "mac/audio_device_listener_mac_unittest.cc",
       "mac/audio_low_latency_input_mac_unittest.cc",
     ]
   }
 
   if (is_chromeos || is_chromecast) {
     sources += [
       "sounds/audio_stream_handler_unittest.cc",
       "sounds/sounds_manager_unittest.cc",
@@ skipping 24 matching lines @@
     ]
   }
 
   if (use_alsa) {
     sources += [
       "alsa/alsa_output_unittest.cc",
       "audio_low_latency_input_output_unittest.cc",
     ]
   }
 }