Add the ability to run a callback between fork and exec.

base/process/launch.cc

 // Copyright (c) 2013 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 "base/process/launch.h"
 
 namespace base {
 
 LaunchOptions::LaunchOptions()
     : wait(false),
@@ skipping 10 matching lines @@
       force_breakaway_from_job_(false)
 #else
       clear_environ(false),
       fds_to_remap(NULL),
       maximize_rlimits(NULL),
       new_process_group(false)
 #if defined(OS_LINUX)
       , clone_flags(0)
       , allow_new_privs(false)
 #endif  // OS_LINUX
+#if defined(OS_POSIX)
+      , pre_exec_delegate(NULL)
+#endif  // OS_POSIX
 #if defined(OS_CHROMEOS)
       , ctrl_terminal_fd(-1)
 #endif  // OS_CHROMEOS
 #endif  // !defined(OS_WIN)
     {
 }
 
 LaunchOptions::~LaunchOptions() {
 }
 
 LaunchOptions LaunchOptionsForTest() {
   LaunchOptions options;
 #if defined(OS_LINUX)
   // To prevent accidental privilege sharing to an untrusted child, processes
   // are started with PR_SET_NO_NEW_PRIVS. Do not set that here, since this
   // new child will be used for testing only.
   options.allow_new_privs = true;
 #endif
   return options;
 }
 
 }  // namespace base