Pepper: Make StartSelLdr asynchronous.

ppapi/native_client/src/trusted/plugin/nacl_entry_points.h

Index: ppapi/native_client/src/trusted/plugin/nacl_entry_points.h
diff --git a/ppapi/native_client/src/trusted/plugin/nacl_entry_points.h b/ppapi/native_client/src/trusted/plugin/nacl_entry_points.h
index 0d182087d66c35f4c5ce2a7390425dbfb181c839..b924066e941079e8dd9ca1e8f7ed42fdec62ac2a 100644
--- a/ppapi/native_client/src/trusted/plugin/nacl_entry_points.h
+++ b/ppapi/native_client/src/trusted/plugin/nacl_entry_points.h
@@ -13,6 +13,7 @@
 #include <string>
 
 #include "native_client/src/shared/imc/nacl_imc_c.h"
+#include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/private/ppb_instance_private.h"
 
@@ -26,7 +27,8 @@ typedef PP_ExternalPluginResult (*LaunchNaClProcessFunc)(
     PP_Bool enable_exception_handling,
     PP_Bool enable_crash_throttling,
     NaClHandle* result_socket,
-    struct PP_Var* error_message);
+    struct PP_Var* error_message,
+    PP_CompletionCallback callback);
 
 
 extern LaunchNaClProcessFunc launch_nacl_process;