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

sandbox/win/src/sandbox_policy.h

 // 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.
 
 #ifndef SANDBOX_WIN_SRC_SANDBOX_POLICY_H_
 #define SANDBOX_WIN_SRC_SANDBOX_POLICY_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 165 matching lines @@
   // launching the sandboxed process will fail. See BrokerServices for details
   // about installing an AppContainer.
   // Note that currently Windows restricts the use of impersonation within
   // AppContainers, so this function is incompatible with the use of an initial
   // token.
   virtual ResultCode SetAppContainer(const wchar_t* sid) = 0;
 
   // Sets a capability to be enabled for the sandboxed process' AppContainer.
   virtual ResultCode SetCapability(const wchar_t* sid) = 0;
 
+  // Sets the LowBox token for sandboxed process. This is mutually exclusive
+  // with SetAppContainer method.
+  virtual ResultCode SetLowBox(const wchar_t* sid) = 0;
+
   // Sets the mitigations enabled when the process is created. Most of these
   // are implemented as attributes passed via STARTUPINFOEX. So they take
   // effect before any thread in the target executes. The declaration of
   // MitigationFlags is followed by a detailed description of each flag.
   virtual ResultCode SetProcessMitigations(MitigationFlags flags) = 0;
 
   // Returns the currently set mitigation flags.
   virtual MitigationFlags GetProcessMitigations() = 0;
 
   // Sets process mitigation flags that don't take effect before the call to
@@ skipping 41 matching lines @@
   // A NULL value for handle_name indicates all handles of the specified type.
   // An empty string for handle_name indicates the handle is unnamed.
   virtual ResultCode AddKernelObjectToClose(const wchar_t* handle_type,
                                             const wchar_t* handle_name) = 0;
 };
 
 }  // namespace sandbox
 
 
 #endif  // SANDBOX_WIN_SRC_SANDBOX_POLICY_H_