Clone of chromium aad1ce808763f59c7a3753e08f1500a104ecc6fd refs/remotes/origin/HEAD
diff --git a/base/thread_task_runner_handle.h b/base/thread_task_runner_handle.h
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+// 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_
