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

ppapi/proxy/irt_ppapi.c

 /*
  * Copyright 2014 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.
  */
 
 #include "native_client/src/untrusted/irt/irt.h"
 #include "native_client/src/untrusted/irt/irt_private.h"
 #include "ppapi/nacl_irt/irt_ppapi.h"
 #include "ppapi/native_client/src/shared/ppapi_proxy/ppruntime.h"
 
-struct PP_StartFunctions g_pp_functions;
+static struct PP_StartFunctions g_pp_functions;
 
-static int irt_ppapi_start(const struct PP_StartFunctions* funcs) {
+int irt_ppapi_start(const struct PP_StartFunctions* funcs) {
   /* Disable NaCl's open_resource() interface on this thread. */
   g_is_main_thread = 1;
 
   g_pp_functions = *funcs;
   return PpapiPluginMain();
 }
 
 int32_t PPP_InitializeModule(PP_Module module_id,
                              PPB_GetInterface get_browser_interface) {
   return g_pp_functions.PPP_InitializeModule(module_id, get_browser_interface);
 }
 
 void PPP_ShutdownModule(void) {
   g_pp_functions.PPP_ShutdownModule();
 }
 
 const void* PPP_GetInterface(const char* interface_name) {
   return g_pp_functions.PPP_GetInterface(interface_name);
 }
 
 const struct nacl_irt_ppapihook nacl_irt_ppapihook = {
   irt_ppapi_start,
   PpapiPluginRegisterThreadCreator,
 };