Add a sandbox API for broker handle duplication

sandbox/src/target_services.cc

Index: sandbox/src/target_services.cc
===================================================================
--- sandbox/src/target_services.cc	(revision 129865)
+++ sandbox/src/target_services.cc	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -9,6 +9,7 @@
 #include "base/basictypes.h"
 #include "sandbox/src/crosscall_client.h"
 #include "sandbox/src/handle_closer_agent.h"
+#include "sandbox/src/handle_interception.h"
 #include "sandbox/src/ipc_tags.h"
 #include "sandbox/src/restricted_token_utils.h"
 #include "sandbox/src/sandbox.h"
@@ -175,4 +176,13 @@
     process_state_ = 3;
 }
 
+ResultCode TargetServicesBase::DuplicateHandle(HANDLE source_handle,
+                                               DWORD target_process_id,
+                                               HANDLE* target_handle,
+                                               DWORD desired_access,
+                                               DWORD options) {
+  return sandbox::DuplicateHandleProxy(source_handle, target_process_id,
+                                       target_handle, desired_access, options);
+}
+
 }  // namespace sandbox