Add a new function for getting a deterministic machine ID

chrome/browser/prefs/tracked/device_id_stub.cc

Index: chrome/browser/prefs/tracked/device_id_stub.cc
diff --git a/chrome/browser/prefs/tracked/device_id_stub.cc b/chrome/browser/prefs/tracked/device_id_stub.cc
new file mode 100644
index 0000000000000000000000000000000000000000..21ed74413247f8039386f534272608492e83a261
--- /dev/null
+++ b/chrome/browser/prefs/tracked/device_id_stub.cc
@@ -0,0 +1,14 @@
+// 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 "chrome/browser/prefs/tracked/device_id.h"
+
+namespace tracked_prefs {
+
+MachineIdStatus GetDeterministicMachineSpecificId(std::string *machine_id) {
+  DCHECK(machine_id);
+  return MachineIdStatus::NOT_IMPLEMENTED;
+}
+
+}