Introduce PPB_AudioInput_Dev v0.3 and refactor the device enumeration code:

ppapi/ppapi_proxy.gypi

 # Copyright (c) 2012 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.
 
 {
   'target_defaults': {
     'variables': {
       'ppapi_proxy_target': 0,
     },
     'target_conditions': [
       # This part is shared between the targets defined below.
       ['ppapi_proxy_target==1', {
         'sources': [
           # Take some standalone files from the C++ wrapper allowing us to more
           # easily make async callbacks in the proxy. We can't depend on the
           # full C++ wrappers at this layer since the C++ wrappers expect
           # symbols defining the globals for "being a plugin" which we are not.
           # These callback files are standalone.
           'cpp/completion_callback.h',
           'utility/completion_callback_factory.h',
 
           'proxy/audio_input_resource.cc',
           'proxy/audio_input_resource.h',
           'proxy/broker_dispatcher.cc',
           'proxy/broker_dispatcher.h',
           'proxy/browser_font_resource_trusted.cc',
           'proxy/browser_font_resource_trusted.h',
           'proxy/connection.h',
+          'proxy/device_enumeration_resource_helper.cc',
+          'proxy/device_enumeration_resource_helper.h',
           'proxy/dispatcher.cc',
           'proxy/dispatcher.h',
           'proxy/enter_proxy.h',
           'proxy/graphics_2d_resource.cc',
           'proxy/graphics_2d_resource.h',
           'proxy/file_chooser_resource.cc',
           'proxy/file_chooser_resource.h',
           'proxy/flash_clipboard_resource.cc',
           'proxy/flash_clipboard_resource.h',
           'proxy/flash_device_id_resource.cc',
@@ skipping 136 matching lines @@
         ],
         'include_dirs': [
           '..',
         ],
         'target_conditions': [
           ['>(nacl_untrusted_build)==1', {
             'sources!': [
               'proxy/audio_input_resource.cc',
               'proxy/broker_dispatcher.cc',
               'proxy/browser_font_resource_trusted.cc',
+              'proxy/device_enumeration_resource_helper.cc',
               'proxy/flash_clipboard_resource.cc',
               'proxy/flash_device_id_resource.cc',
               'proxy/flash_font_file_resource.cc',
               'proxy/flash_fullscreen_resource.cc',
               'proxy/flash_menu_resource.cc',
               'proxy/flash_resource.cc',
               'proxy/host_dispatcher.cc',
               'proxy/host_var_serialization_rules.cc',
               'proxy/ppb_broker_proxy.cc',
               'proxy/ppb_buffer_proxy.cc',
               'proxy/ppb_flash_message_loop_proxy.cc',
               'proxy/ppb_flash_proxy.cc',
               'proxy/ppb_pdf_proxy.cc',
               'proxy/ppb_talk_private_proxy.cc',
               'proxy/ppb_video_capture_proxy.cc',
               'proxy/ppb_video_decoder_proxy.cc',
               'proxy/ppp_content_decryptor_private_proxy.cc',
               'proxy/ppp_instance_private_proxy.cc',
               'proxy/ppp_video_decoder_proxy.cc',
               'proxy/serialized_flash_menu.cc',
               'proxy/talk_resource.cc',
               'proxy/video_capture_resource.cc',
             ],
           }],
         ],
       }],
     ],
   },
 }