Support audio output device enumeration and selection in PPAPI

ppapi/proxy/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.
 
 import("//build/config/nacl/config.gni")
 
 config("proxy_implementation") {
   defines = [ "PPAPI_PROXY_IMPLEMENTATION" ]
 }
 
@@ skipping 201 matching lines @@
       "../nacl_irt/manifest_service.h",
       "../nacl_irt/plugin_startup.cc",
       "../nacl_irt/plugin_startup.h",
       "../nacl_irt/ppapi_dispatcher.cc",
       "../nacl_irt/ppapi_dispatcher.h",
     ]
   } else {
     sources += [
       "audio_input_resource.cc",
       "audio_input_resource.h",
+      "audio_output_resource.cc",
+      "audio_output_resource.h",
       "broker_dispatcher.cc",
       "broker_dispatcher.h",
       "browser_font_singleton_resource.cc",
       "browser_font_singleton_resource.h",
       "device_enumeration_resource_helper.cc",
       "device_enumeration_resource_helper.h",
       "flash_clipboard_resource.cc",
       "flash_clipboard_resource.h",
       "flash_drm_resource.cc",
       "flash_drm_resource.h",
@@ skipping 154 matching lines @@
   deps = [
     "//base/test:test_support",
     "//ipc",
     "//ipc:test_support",
     "//ppapi/proxy",
     "//ppapi/shared_impl",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }