Add real_path option to LaunchProcess

base/process/launch_posix.cc

 // 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.
 
 #include "base/process/launch.h"
 
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <sched.h>
@@ skipping 469 matching lines @@
 #endif
 
     if (current_directory != nullptr) {
       RAW_CHECK(chdir(current_directory) == 0);
     }
 
     if (options.pre_exec_delegate != nullptr) {
       options.pre_exec_delegate->RunAsyncSafe();
     }
 
-    execvp(argv_cstr[0], argv_cstr.get());
+    const char* executable_path = !options.real_path.empty() ?
+        options.real_path.value().c_str() : argv_cstr[0];
+
+    execvp(executable_path, argv_cstr.get());
 
     RAW_LOG(ERROR, "LaunchProcess: failed to execvp:");
     RAW_LOG(ERROR, argv_cstr[0]);
     _exit(127);
   } else {
     // Parent process
     if (options.wait) {
       // While this isn't strictly disk IO, waiting for another process to
       // finish is the sort of thing ThreadRestrictions is trying to prevent.
       base::ThreadRestrictions::AssertIOAllowed();
@@ skipping 238 matching lines @@
   jmp_buf env;
   if (setjmp(env) == 0) {
     return CloneAndLongjmpInChild(flags, ptid, ctid, &env);
   }
 
   return 0;
 }
 #endif  // defined(OS_LINUX) || defined(OS_NACL_NONSFI)
 
 }  // namespace base