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diff --git a/src/third_party/gperftools-2.7/dist/src/tests/atomicops_unittest.cc b/src/third_party/gperftools-2.7/dist/src/tests/atomicops_unittest.cc
new file mode 100644
index 00000000000..aa82a6b56ee
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+++ b/src/third_party/gperftools-2.7/dist/src/tests/atomicops_unittest.cc
@@ -0,0 +1,162 @@
+// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
+/* Copyright (c) 2006, Google Inc.
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * ---
+ * Author: Sanjay Ghemawat
+ */
+
+#include <stdio.h>
+#include "base/logging.h"
+#include "base/atomicops.h"
+
+#define GG_ULONGLONG(x)  static_cast<uint64>(x)
+
+
+#define NUM_BITS(T) (sizeof(T) * 8)
+
+
+template <class AtomicType>
+static void TestCompareAndSwap(AtomicType (*compare_and_swap_func)
+                               (volatile AtomicType*, AtomicType, AtomicType)) {
+  AtomicType value = 0;
+  AtomicType prev = (*compare_and_swap_func)(&value, 0, 1);
+  ASSERT_EQ(1, value);
+  ASSERT_EQ(0, prev);
+
+  // Use test value that has non-zero bits in both halves, more for testing
+  // 64-bit implementation on 32-bit platforms.
+  const AtomicType k_test_val = (GG_ULONGLONG(1) <<
+                                 (NUM_BITS(AtomicType) - 2)) + 11;
+  value = k_test_val;
+  prev = (*compare_and_swap_func)(&value, 0, 5);
+  ASSERT_EQ(k_test_val, value);
+  ASSERT_EQ(k_test_val, prev);
+
+  value = k_test_val;
+  prev = (*compare_and_swap_func)(&value, k_test_val, 5);
+  ASSERT_EQ(5, value);
+  ASSERT_EQ(k_test_val, prev);
+}
+
+
+template <class AtomicType>
+static void TestAtomicExchange(AtomicType (*atomic_exchange_func)
+                               (volatile AtomicType*, AtomicType)) {
+  AtomicType value = 0;
+  AtomicType new_value = (*atomic_exchange_func)(&value, 1);
+  ASSERT_EQ(1, value);
+  ASSERT_EQ(0, new_value);
+
+  // Use test value that has non-zero bits in both halves, more for testing
+  // 64-bit implementation on 32-bit platforms.
+  const AtomicType k_test_val = (GG_ULONGLONG(1) <<
+                                 (NUM_BITS(AtomicType) - 2)) + 11;
+  value = k_test_val;
+  new_value = (*atomic_exchange_func)(&value, k_test_val);
+  ASSERT_EQ(k_test_val, value);
+  ASSERT_EQ(k_test_val, new_value);
+
+  value = k_test_val;
+  new_value = (*atomic_exchange_func)(&value, 5);
+  ASSERT_EQ(5, value);
+  ASSERT_EQ(k_test_val, new_value);
+}
+
+
+// This is a simple sanity check that values are correct. Not testing
+// atomicity
+template <class AtomicType>
+static void TestStore() {
+  const AtomicType kVal1 = static_cast<AtomicType>(0xa5a5a5a5a5a5a5a5LL);
+  const AtomicType kVal2 = static_cast<AtomicType>(-1);
+
+  AtomicType value;
+
+  base::subtle::NoBarrier_Store(&value, kVal1);
+  ASSERT_EQ(kVal1, value);
+  base::subtle::NoBarrier_Store(&value, kVal2);
+  ASSERT_EQ(kVal2, value);
+
+  base::subtle::Acquire_Store(&value, kVal1);
+  ASSERT_EQ(kVal1, value);
+  base::subtle::Acquire_Store(&value, kVal2);
+  ASSERT_EQ(kVal2, value);
+
+  base::subtle::Release_Store(&value, kVal1);
+  ASSERT_EQ(kVal1, value);
+  base::subtle::Release_Store(&value, kVal2);
+  ASSERT_EQ(kVal2, value);
+}
+
+// This is a simple sanity check that values are correct. Not testing
+// atomicity
+template <class AtomicType>
+static void TestLoad() {
+  const AtomicType kVal1 = static_cast<AtomicType>(0xa5a5a5a5a5a5a5a5LL);
+  const AtomicType kVal2 = static_cast<AtomicType>(-1);
+
+  AtomicType value;
+
+  value = kVal1;
+  ASSERT_EQ(kVal1, base::subtle::NoBarrier_Load(&value));
+  value = kVal2;
+  ASSERT_EQ(kVal2, base::subtle::NoBarrier_Load(&value));
+
+  value = kVal1;
+  ASSERT_EQ(kVal1, base::subtle::Acquire_Load(&value));
+  value = kVal2;
+  ASSERT_EQ(kVal2, base::subtle::Acquire_Load(&value));
+
+  value = kVal1;
+  ASSERT_EQ(kVal1, base::subtle::Release_Load(&value));
+  value = kVal2;
+  ASSERT_EQ(kVal2, base::subtle::Release_Load(&value));
+}
+
+template <class AtomicType>
+static void TestAtomicOps() {
+  TestCompareAndSwap<AtomicType>(base::subtle::NoBarrier_CompareAndSwap);
+  TestCompareAndSwap<AtomicType>(base::subtle::Acquire_CompareAndSwap);
+  TestCompareAndSwap<AtomicType>(base::subtle::Release_CompareAndSwap);
+
+  TestAtomicExchange<AtomicType>(base::subtle::NoBarrier_AtomicExchange);
+  TestAtomicExchange<AtomicType>(base::subtle::Acquire_AtomicExchange);
+  TestAtomicExchange<AtomicType>(base::subtle::Release_AtomicExchange);
+
+  TestStore<AtomicType>();
+  TestLoad<AtomicType>();
+}
+
+int main(int argc, char** argv) {
+  TestAtomicOps<AtomicWord>();
+  TestAtomicOps<Atomic32>();
+  printf("PASS\n");
+  return 0;
+}