Adding method to create process using LowBox token in sandbox code.

sandbox/win/src/target_process.h

Index: sandbox/win/src/target_process.h
diff --git a/sandbox/win/src/target_process.h b/sandbox/win/src/target_process.h
index 9a8dded55a284a38180c71c886a688f9188d9418..cf5ad9f3c88bb44302d86ac4bcd6f3b23a43ea9c 100644
--- a/sandbox/win/src/target_process.h
+++ b/sandbox/win/src/target_process.h
@@ -45,9 +45,12 @@ class TargetProcess {
   void Release() {}
 
   // Creates the new target process. The process is created suspended.
+  // When |set_lockdown_token_after_create| is set, the lockdown token
+  // is replaced after the process is created
   DWORD Create(const wchar_t* exe_path,
                const wchar_t* command_line,
                bool inherit_handles,
+               bool set_lockdown_token_after_create,
                const base::win::StartupInformation& startup_info,
                base::win::ScopedProcessInformation* target_info);