diff -r 000000000000 -r 6474c204b198 ipc/chromium/src/base/non_thread_safe.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/chromium/src/base/non_thread_safe.cc	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+// Copyright (c) 2006-2008 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 "base/non_thread_safe.h"
+
+// These checks are only done in debug builds.
+#ifndef NDEBUG
+
+#include "base/logging.h"
+
+NonThreadSafe::NonThreadSafe()
+    : valid_thread_id_(PlatformThread::CurrentId()) {
+}
+
+bool NonThreadSafe::CalledOnValidThread() const {
+  return valid_thread_id_ == PlatformThread::CurrentId();
+}
+
+NonThreadSafe::~NonThreadSafe() {
+  DCHECK(CalledOnValidThread());
+}
+
+#endif  // NDEBUG