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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_SINGLE_THREAD_TASK_RUNNER_H_
+#define BASE_SINGLE_THREAD_TASK_RUNNER_H_
+
+#include "base/base_export.h"
+#include "base/sequenced_task_runner.h"
+
+namespace base {
+
+// A SingleThreadTaskRunner is a SequencedTaskRunner with one more
+// guarantee; namely, that all tasks are run on a single dedicated
+// thread.  Most use cases require only a SequencedTaskRunner, unless
+// there is a specific need to run tasks on only a single thread.
+//
+// SingleThreadTaskRunner implementations might:
+//   - Post tasks to an existing thread's MessageLoop (see
+//     MessageLoop::task_runner()).
+//   - Create their own worker thread and MessageLoop to post tasks to.
+//   - Add tasks to a FIFO and signal to a non-MessageLoop thread for them to
+//     be processed. This allows TaskRunner-oriented code run on threads
+//     running other kinds of message loop, e.g. Jingle threads.
+class BASE_EXPORT SingleThreadTaskRunner : public SequencedTaskRunner {
+ public:
+  // A more explicit alias to RunsTasksInCurrentSequence().
+  bool BelongsToCurrentThread() const { return RunsTasksInCurrentSequence(); }
+
+ protected:
+  ~SingleThreadTaskRunner() override = default;
+};
+
+}  // namespace base
+
+#endif  // BASE_SINGLE_THREAD_TASK_RUNNER_H_