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

ppapi/proxy/irt_ppapi.c

Index: ppapi/proxy/irt_ppapi.c
diff --git a/ppapi/proxy/irt_ppapi.c b/ppapi/proxy/irt_ppapi.c
index 5d9c2c2346092875b5cab6562e7e8e73b9a34453..442327030694c133bf2df7ec15e9d2d1dc77b0d7 100644
--- a/ppapi/proxy/irt_ppapi.c
+++ b/ppapi/proxy/irt_ppapi.c
@@ -9,9 +9,9 @@
 #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;