HostResolver is exposed to Native Client.

ppapi/ppapi_sources.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.
 
 {
   'variables': {
     'c_source_files': [
       'c/pp_array_output.h',
       'c/pp_bool.h',
       'c/pp_completion_callback.h',
@@ skipping 80 matching lines @@
       'c/private/ppb_flash.h',
       'c/private/ppb_flash_clipboard.h',
       'c/private/ppb_flash_file.h',
       'c/private/ppb_flash_fullscreen.h',
       'c/private/ppb_flash_menu.h',
       'c/private/ppb_flash_message_loop.h',
       'c/private/ppb_flash_net_connector.h',
       'c/private/ppb_flash_tcp_socket.h',
       'c/private/ppb_flash_udp_socket.h',
       'c/private/ppb_gpu_blacklist_private.h',
+      'c/private/ppb_host_resolver_private.h',
       'c/private/ppb_instance_private.h',
       'c/private/ppb_nacl_private.h',
       'c/private/ppb_net_address_private.h',
       'c/private/ppb_pdf.h',
       'c/private/ppb_proxy_private.h',
       'c/private/ppp_instance_private.h',
       'c/private/ppb_network_list_private.h',
       'c/private/ppb_network_monitor_private.h',
+      'c/private/ppb_tcp_server_socket_private.h',
       'c/private/ppb_tcp_socket_private.h',
       'c/private/ppb_udp_socket_private.h',
 
       # Deprecated interfaces.
       'c/dev/deprecated_bool.h',
       'c/dev/ppb_var_deprecated.h',
       'c/dev/ppp_class_deprecated.h',
 
       # Trusted interfaces.
       'c/trusted/ppb_audio_trusted.h',
@@ skipping 185 matching lines @@
       # Common test files
       'tests/all_c_includes.h',
       'tests/all_cpp_includes.h',
       'tests/arch_dependent_sizes_32.h',
       'tests/arch_dependent_sizes_64.h',
       'tests/pp_thread.h',
       'tests/test_case.cc',
       'tests/test_case.h',
       'tests/test_empty.cc',
       'tests/test_empty.h',
+      'tests/test_host_resolver_private.cc',
+      'tests/test_host_resolver_private.h',
       'tests/test_net_address_private_untrusted.cc',
       'tests/test_net_address_private_untrusted.h',
       'tests/test_tcp_server_socket_private.cc',
       'tests/test_tcp_server_socket_private.h',
       'tests/test_tcp_socket_private.cc',
       'tests/test_tcp_socket_private.h',
       'tests/test_udp_socket_private.cc',
       'tests/test_udp_socket_private.h',
       'tests/test_utils.cc',
       'tests/testing_instance.cc',
@@ skipping 72 matching lines @@
       'tests/test_flash_fullscreen.cc',
       'tests/test_flash_fullscreen.h',
       'tests/test_flash_message_loop.cc',
       'tests/test_flash_message_loop.h',
       'tests/test_fullscreen.cc',
       'tests/test_fullscreen.h',
       'tests/test_graphics_2d.cc',
       'tests/test_graphics_2d.h',
       'tests/test_graphics_3d.cc',
       'tests/test_graphics_3d.h',
-      'tests/test_host_resolver_private.cc',
-      'tests/test_host_resolver_private.h',
       'tests/test_image_data.cc',
       'tests/test_image_data.h',
       'tests/test_input_event.cc',
       'tests/test_input_event.h',
       'tests/test_memory.cc',
       'tests/test_memory.h',
       'tests/test_net_address_private.cc',
       'tests/test_net_address_private.h',
       'tests/test_network_monitor_private.cc',
       'tests/test_network_monitor_private.h',
@@ skipping 39 matching lines @@
           'c/dev/ppb_transport_dev.h',
         ],
         'cpp_source_files': [
           'cpp/dev/transport_dev.cc',
           'cpp/dev/transport_dev.h',
         ],
       },
     }],
   ],
 }