Check-in rlz code to src\rlz from http://code.google.com/p/rlz/.

rlz/lib/machine_id.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 RLZ_LIB_MACHINE_ID_H_
+#define RLZ_LIB_MACHINE_ID_H_
+
+#include "base/string16.h"
+
+#include <string>
+
+namespace rlz_lib {
+
+// Gets the unique ID for the machine used for RLZ tracking purposes. On
+// Windows, this ID is derived from the Windows machine SID, and is the string
+// representation of a 20 byte hash + 4 bytes volum id + a 1 byte checksum.
+// Included in financial pings with events, unless explicitly forbidden by the
+// calling application.
+bool GetMachineId(std::string* machine_id);
+
+// Retrieves a raw machine identifier string and a machine-specific
+// 4 byte value. GetMachineId() will SHA1 |data|, append |more_data|, compute
+// the Crc8 of that, and return a hex-encoded string of that data.
+bool GetRawMachineId(string16* data, int* more_data);
+
+namespace testing {
+bool GetMachineIdImpl(const string16& sid_string,
+                      int volume_id,
+                      std::string* machine_id);
+}  // namespace testing
+
+}  // namespace rlz_lib
+
+#endif  // RLZ_LIB_MACHINE_ID_H_