HostResolver is exposed to Native Client.

ppapi/native_client/src/shared/ppapi_proxy/run_srpcgen.py

 #!/usr/bin/env python
 # 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.
 
 """Driver of srpcgen for ppapi_proxy sources.
 
 This must be run after modifying, adding, or removing .srpc files.
 The lists of .srpc files are in this source file.
 """
@@ skipping 53 matching lines @@
          'ppb_cursor_control.srpc',
          'ppb_file_io.srpc',
          'ppb_file_ref.srpc',
          'ppb_file_system.srpc',
          'ppb_find.srpc',
          'ppb_font.srpc',
          'ppb_fullscreen.srpc',
          'ppb_gamepad.srpc',
          'ppb_graphics_2d.srpc',
          'ppb_graphics_3d.srpc',
+         'ppb_host_resolver_private.srpc',
          'ppb_image_data.srpc',
          'ppb_input_event.srpc',
          'ppb_instance.srpc',
          'ppb_messaging.srpc',
          'ppb_mouse_lock.srpc',
          'ppb_net_address_private.srpc',
          'ppb_pdf.srpc',
          'ppb_scrollbar.srpc',
          'ppb_tcp_server_socket_private.srpc',
          'ppb_tcp_socket_private.srpc',
@@ skipping 118 matching lines @@
                                                     'srpcgen.py'))
 
   if args:
     parser.print_help()
     return 1
 
   return RunAll(options)
 
 if __name__ == '__main__':
   sys.exit(Main(sys.argv))