Add a new function for getting a deterministic machine ID

chrome/browser/prefs/tracked/device_id_unittest.cc

Index: chrome/browser/prefs/tracked/device_id_unittest.cc
diff --git a/chrome/browser/prefs/tracked/device_id_unittest.cc b/chrome/browser/prefs/tracked/device_id_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3a03b0677e6f93c562b88660f05b80f4422f4c10
--- /dev/null
+++ b/chrome/browser/prefs/tracked/device_id_unittest.cc
@@ -0,0 +1,32 @@
+// Copyright 2015 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 "build/build_config.h"
+#include "chrome/browser/prefs/tracked/device_id.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace tracked_prefs {
+
+TEST(GetDeterministicMachineSpecificIdTest, IsDeterministic) {
+  std::string first_machine_id;
+  std::string second_machine_id;
+
+  const MachineIdStatus kExpectedStatus =
+#if defined(OS_WIN)
+    MachineIdStatus::SUCCESS;
+#else
+    MachineIdStatus::NOT_IMPLEMENTED;
+#endif
+
+  ASSERT_EQ(kExpectedStatus,
+            GetDeterministicMachineSpecificId(&first_machine_id));
+  ASSERT_EQ(kExpectedStatus,
+            GetDeterministicMachineSpecificId(&second_machine_id));
+
+  EXPECT_EQ(kExpectedStatus == MachineIdStatus::SUCCESS,
+            !first_machine_id.empty());
+  EXPECT_EQ(first_machine_id, second_machine_id);
+}
+
+}  // namespace tracked_prefs