text: // Copyright 2018 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_UPDATEABLE_SEQUENCED_TASK_RUNNER_H_
  #define BASE_UPDATEABLE_SEQUENCED_TASK_RUNNER_H_
  
  #include "base/sequenced_task_runner.h"
  #include "base/task/task_traits.h"
  
  namespace base {
  
  // A SequencedTaskRunner whose posted tasks' priorities can be updated.
  class BASE_EXPORT UpdateableSequencedTaskRunner : public SequencedTaskRunner {
   public:
    // Updates the priority for tasks posted through this TaskRunner to
    // |priority|.
    virtual void UpdatePriority(TaskPriority priority) = 0;
  
   protected:
    UpdateableSequencedTaskRunner() = default;
    ~UpdateableSequencedTaskRunner() override = default;
  
    DISALLOW_COPY_AND_ASSIGN(UpdateableSequencedTaskRunner);
  };
  
  }  // namespace base
  
  #endif  // BASE_UPDATEABLE_SEQUENCED_TASK_RUNNER_H_
  