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diff --git a/chromium/third_party/blink/renderer/platform/scheduler/renderer/deadline_task_runner.h b/chromium/third_party/blink/renderer/platform/scheduler/renderer/deadline_task_runner.h
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+// Copyright 2015 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_RENDERER_DEADLINE_TASK_RUNNER_H_
+#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_RENDERER_DEADLINE_TASK_RUNNER_H_
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/single_thread_task_runner.h"
+#include "base/time/time.h"
+#include "third_party/blink/renderer/platform/platform_export.h"
+#include "third_party/blink/renderer/platform/scheduler/child/cancelable_closure_holder.h"
+
+namespace blink {
+namespace scheduler {
+
+// Runs a posted task at latest by a given deadline, but possibly sooner.
+class PLATFORM_EXPORT DeadlineTaskRunner {
+ public:
+ DeadlineTaskRunner(const base::RepeatingClosure& callback,
+ scoped_refptr<base::SingleThreadTaskRunner> task_runner);
+
+ ~DeadlineTaskRunner();
+
+ // If there is no outstanding task then a task is posted to run after |delay|.
+ // If there is an outstanding task which is scheduled to run:
+ // a) sooner - then this is a NOP.
+ // b) later - then the outstanding task is cancelled and a new task is
+ // posted to run after |delay|.
+ //
+ // Once the deadline task has run, we reset.
+ void SetDeadline(const base::Location& from_here,
+ base::TimeDelta delay,
+ base::TimeTicks now);
+
+ private:
+ void RunInternal();
+
+ CancelableClosureHolder cancelable_run_internal_;
+ base::RepeatingClosure callback_;
+ base::TimeTicks deadline_;
+ scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+
+ DISALLOW_COPY_AND_ASSIGN(DeadlineTaskRunner);
+};
+
+} // namespace scheduler
+} // namespace blink
+
+#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_RENDERER_DEADLINE_TASK_RUNNER_H_