Support audio output device enumeration and selection in PPAPI

ppapi/thunk/BUILD.gn

 # Copyright 2015 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.
 
 source_set("thunk") {
   # In GYP this is the same target as shared_impl. In GN these are split apart
   # for clarity but to get component builds correct, targets must only depend
   # on these via the shared_impl component.
   # TODO(brettw) separate these when GYP compat is no longer required.
   visibility = [ "//ppapi/shared_impl" ]
 
   sources = [
     "enter.cc",
     "enter.h",
     "ppb_audio_api.h",
     "ppb_audio_buffer_api.h",
     "ppb_audio_buffer_thunk.cc",
     "ppb_audio_config_api.h",
     "ppb_audio_config_thunk.cc",
     "ppb_audio_encoder_api.h",
     "ppb_audio_encoder_thunk.cc",
     "ppb_audio_input_api.h",
+    "ppb_audio_output_api.h",
     "ppb_audio_thunk.cc",
     "ppb_broker_api.h",
     "ppb_browser_font_trusted_api.h",
     "ppb_buffer_api.h",
     "ppb_camera_capabilities_api.h",
     "ppb_camera_capabilities_private_thunk.cc",
     "ppb_camera_device_api.h",
     "ppb_camera_device_private_thunk.cc",
     "ppb_compositor_api.h",
     "ppb_compositor_layer_api.h",
@@ skipping 110 matching lines @@
     "ppb_websocket_api.h",
     "ppb_websocket_thunk.cc",
     "ppb_x509_certificate_private_api.h",
     "ppb_x509_certificate_private_thunk.cc",
     "thunk.h",
   ]
 
   if (!is_nacl) {
     sources += [
       "ppb_audio_input_dev_thunk.cc",
+      "ppb_audio_output_dev_thunk.cc",
       "ppb_broker_thunk.cc",
       "ppb_browser_font_trusted_thunk.cc",
       "ppb_buffer_thunk.cc",
       "ppb_char_set_thunk.cc",
       "ppb_content_decryptor_private_thunk.cc",
       "ppb_flash_clipboard_thunk.cc",
       "ppb_flash_device_id_thunk.cc",
       "ppb_flash_drm_thunk.cc",
       "ppb_flash_file_fileref_thunk.cc",
       "ppb_flash_file_modulelocal_thunk.cc",
@@ skipping 28 matching lines @@
 
   configs += [ "//build/config:precompiled_headers" ]
   defines = [
     # This target goes in the same library as shared_impl (in GYP they are the
     # same).
     "PPAPI_SHARED_IMPLEMENTATION",
 
     "PPAPI_THUNK_IMPLEMENTATION",
   ]
 }