Add real_path option to LaunchProcess

base/process/launch_posix.cc

Index: base/process/launch_posix.cc
diff --git a/base/process/launch_posix.cc b/base/process/launch_posix.cc
index 5906d1d94ab4e3ca6d10d7dc6db6262670affeb7..e45604362511b4877236c5e856396d6420b1589e 100644
--- a/base/process/launch_posix.cc
+++ b/base/process/launch_posix.cc
@@ -487,7 +487,10 @@ Process LaunchProcess(const std::vector<std::string>& argv,
       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]);