Move base to DEPS

base/single_thread_task_runner.h

-// 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 RunsTasksOnCurrentThread().
-  bool BelongsToCurrentThread() const {
-    return RunsTasksOnCurrentThread();
-  }
-
- protected:
-  ~SingleThreadTaskRunner() override {}
-};
-
-}  // namespace base
-
-#endif  // BASE_SINGLE_THREAD_TASK_RUNNER_H_