TaskScheduler [3/9] Task and Sequence

base/task_scheduler/sequence_sort_key.h

+// Copyright 2016 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_TASK_SCHEDULER_SEQUENCE_SORT_KEY_H_
+#define BASE_TASK_SCHEDULER_SEQUENCE_SORT_KEY_H_
+
+#include "base/base_export.h"
+#include "base/task_scheduler/task_traits.h"
+#include "base/time/time.h"
+
+namespace base {
+namespace internal {
+
+// An immutable representation of the priority of a Sequence.
+struct BASE_EXPORT SequenceSortKey final {
+  SequenceSortKey(TaskPriority priority, TimeTicks next_task_sequenced_time);
+
+  bool operator<(const SequenceSortKey& other) const;
+  bool operator>(const SequenceSortKey& other) const;
+
+  // Highest task priority in the sequence at the time this sort key was
+  // created.
+  const TaskPriority priority;
+
+  // Sequenced time of the next task to run in the sequence at the time this
+  // sort key was created.
+  const TimeTicks next_task_sequenced_time;
+};
+
+}  // namespace internal
+}  // namespace base
+
+#endif  // BASE_TASK_SCHEDULER_SEQUENCE_SORT_KEY_H_