Split the PNaCl IRT shim into 3 pieces, and include one piece into IRT.

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': [
@@ skipping 226 matching lines @@
         'defines': [
           'PPAPI_PROXY_IMPLEMENTATION',
         ],
         'include_dirs': [
           '..',
         ],
         'target_conditions': [
           ['>(nacl_untrusted_build)==1', {
             'sources': [
               'proxy/irt_ppapi.c',
+              'proxy/irt_shim_ppapi.c',
             ],
             'sources!': [
               'proxy/audio_input_resource.cc',
               'proxy/broker_dispatcher.cc',
               'proxy/browser_font_singleton_resource.cc',
               'proxy/device_enumeration_resource_helper.cc',
               'proxy/flash_clipboard_resource.cc',
               'proxy/flash_drm_resource.cc',
               'proxy/flash_file_resource.cc',
               'proxy/flash_font_file_resource.cc',
@@ skipping 19 matching lines @@
               'proxy/serialized_flash_menu.cc',
               'proxy/talk_resource.cc',
               'proxy/video_capture_resource.cc',
             ],
           }],
         ],
       }],
     ],
   },
 }