new file mode 100644
--- /dev/null
+++ b/dom/media/gmp/rlz/lib/crc8.cc
@@ -0,0 +1,90 @@
+// 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.
+
+#include "rlz/lib/crc8.h"
+
+namespace {
+
+// The CRC lookup table used for ATM HES (Polynomial = 0x07).
+// These are 256 unique 8-bit values.
+const unsigned char kCrcTable[256] = {
+  0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15,
+  0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,
+  0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65,
+  0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,
+  0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5,
+  0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
+  0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85,
+  0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,
+  0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2,
+  0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,
+  0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2,
+  0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
+  0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32,
+  0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,
+  0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42,
+  0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,
+  0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C,
+  0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
+  0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC,
+  0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,
+  0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C,
+  0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,
+  0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C,
+  0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
+  0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B,
+  0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,
+  0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B,
+  0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,
+  0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB,
+  0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
+  0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB,
+  0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3
+};
+
+}  // namespace anonymous
+
+
+namespace rlz_lib {
+
+bool Crc8::Generate(const unsigned char *data, int length,
+                    unsigned char* check_sum) {
+  if (!check_sum)
+    return false;
+
+  *check_sum = 0;
+  if (!data)
+    return false;
+
+  // The inital and final constants are as used in the ATM HEC.
+  static const unsigned char kInitial = 0x00;
+  static const unsigned char kFinal = 0x55;
+  unsigned char crc = kInitial;
+  for (int i = 0; i < length; ++i) {
+    crc = kCrcTable[(data[i] ^ crc) & 0xFFU];
+  }
+
+  *check_sum =  crc ^ kFinal;
+  return true;
+}
+
+bool Crc8::Verify(const unsigned char* data, int length,
+                  unsigned char check_sum, bool* matches) {
+  if (!matches)
+    return false;
+
+  *matches = false;
+  if (!data)
+    return false;
+
+  unsigned char calculated_crc;
+  if (!Generate(data, length, &calculated_crc))
+    return false;
+
+  *matches = check_sum == calculated_crc;
+
+  return true;
+}
+
+}  // namespace rlz_lib

new file mode 100644
--- /dev/null
+++ b/dom/media/gmp/rlz/lib/crc8.h
@@ -0,0 +1,24 @@
+// 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.
+//
+// Crc8 utility functions.
+
+#ifndef RLZ_LIB_CRC8_H_
+#define RLZ_LIB_CRC8_H_
+
+namespace rlz_lib {
+// CRC-8 methods:
+class Crc8 {
+ public:
+  static bool Generate(const unsigned char* data,
+                       int length,
+                       unsigned char* check_sum);
+  static bool Verify(const unsigned char* data,
+                     int length,
+                     unsigned char checksum,
+                     bool * matches);
+};
+};  // namespace rlz_lib
+
+#endif  // RLZ_LIB_CRC8_H_

new file mode 100644
--- /dev/null
+++ b/dom/media/gmp/rlz/lib/machine_id.cc
@@ -0,0 +1,86 @@
+// 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.
+
+#include "rlz/lib/machine_id.h"
+
+#include <stddef.h>
+
+#include "base/sha1.h"
+#include "rlz/lib/assert.h"
+#include "rlz/lib/crc8.h"
+#include "rlz/lib/string_utils.h"
+
+namespace rlz_lib {
+
+bool GetMachineId(std::string* machine_id) {
+  if (!machine_id)
+    return false;
+
+  static std::string calculated_id;
+  static bool calculated = false;
+  if (calculated) {
+    *machine_id = calculated_id;
+    return true;
+  }
+
+  base::string16 sid_string;
+  int volume_id;
+  if (!GetRawMachineId(&sid_string, &volume_id))
+    return false;
+
+  if (!testing::GetMachineIdImpl(sid_string, volume_id, machine_id))
+    return false;
+
+  calculated = true;
+  calculated_id = *machine_id;
+  return true;
+}
+
+namespace testing {
+
+bool GetMachineIdImpl(const base::string16& sid_string,
+                      int volume_id,
+                      std::string* machine_id) {
+  machine_id->clear();
+
+  // The ID should be the SID hash + the Hard Drive SNo. + checksum byte.
+  static const int kSizeWithoutChecksum = base::kSHA1Length + sizeof(int);
+  std::basic_string<unsigned char> id_binary(kSizeWithoutChecksum + 1, 0);
+
+  if (!sid_string.empty()) {
+    // In order to be compatible with the old version of RLZ, the hash of the
+    // SID must be done with all the original bytes from the unicode string.
+    // However, the chromebase SHA1 hash function takes only an std::string as
+    // input, so the unicode string needs to be converted to std::string
+    // "as is".
+    size_t byte_count = sid_string.size() * sizeof(base::string16::value_type);
+    const char* buffer = reinterpret_cast<const char*>(sid_string.c_str());
+    std::string sid_string_buffer(buffer, byte_count);
+
+    // Note that digest can have embedded nulls.
+    std::string digest(base::SHA1HashString(sid_string_buffer));
+    VERIFY(digest.size() == base::kSHA1Length);
+    std::copy(digest.begin(), digest.end(), id_binary.begin());
+  }
+
+  // Convert from int to binary (makes big-endian).
+  for (size_t i = 0; i < sizeof(int); i++) {
+    int shift_bits = 8 * (sizeof(int) - i - 1);
+    id_binary[base::kSHA1Length + i] = static_cast<unsigned char>(
+        (volume_id >> shift_bits) & 0xFF);
+  }
+
+  // Append the checksum byte.
+  if (!sid_string.empty() || (0 != volume_id))
+    rlz_lib::Crc8::Generate(id_binary.c_str(),
+                            kSizeWithoutChecksum,
+                            &id_binary[kSizeWithoutChecksum]);
+
+  return rlz_lib::BytesToString(
+      id_binary.c_str(), kSizeWithoutChecksum + 1, machine_id);
+}
+
+}  // namespace testing
+
+}  // namespace rlz_lib

--- a/dom/media/gmp/rlz/lib/machine_id.h
+++ b/dom/media/gmp/rlz/lib/machine_id.h
@@ -1,19 +1,33 @@
 // 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 <string>
 #include <vector>
 
 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(std::vector<uint8_t>* data, int* more_data);
 
+namespace testing {
+bool GetMachineIdImpl(const base::string16& sid_string,
+                      int volume_id,
+                      std::string* machine_id);
+}  // namespace testing
+
 }  // namespace rlz_lib
 
 #endif  // RLZ_LIB_MACHINE_ID_H_