diff -r 000000000000 -r 6474c204b198 security/sandbox/chromium/base/thread_task_runner_handle.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/security/sandbox/chromium/base/thread_task_runner_handle.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,40 @@
+// 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 BASE_THREAD_TASK_RUNNER_HANDLE_H_
+#define BASE_THREAD_TASK_RUNNER_HANDLE_H_
+
+#include "base/base_export.h"
+#include "base/memory/ref_counted.h"
+
+namespace base {
+
+class SingleThreadTaskRunner;
+
+// ThreadTaskRunnerHandle stores a reference to a thread's TaskRunner
+// in thread-local storage.  Callers can then retrieve the TaskRunner
+// for the current thread by calling ThreadTaskRunnerHandle::Get().
+// At most one TaskRunner may be bound to each thread at a time.
+class BASE_EXPORT ThreadTaskRunnerHandle {
+ public:
+  // Gets the SingleThreadTaskRunner for the current thread.
+  static scoped_refptr<SingleThreadTaskRunner> Get();
+
+  // Returns true if the SingleThreadTaskRunner is already created for
+  // the current thread.
+  static bool IsSet();
+
+  // Binds |task_runner| to the current thread. |task_runner| must belong
+  // to the current thread for this to succeed.
+  explicit ThreadTaskRunnerHandle(
+      const scoped_refptr<SingleThreadTaskRunner>& task_runner);
+  ~ThreadTaskRunnerHandle();
+
+ private:
+  scoped_refptr<SingleThreadTaskRunner> task_runner_;
+};
+
+}  // namespace base
+
+#endif  // BASE_THREAD_TASK_RUNNER_HANDLE_H_