Move blink scheduler implementation into a component

components/scheduler/child/null_idle_task_runner.h

+// 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 COMPONENTS_SCHEDULER_CHILD_NULL_IDLE_TASK_RUNNER_H_
+#define COMPONENTS_SCHEDULER_CHILD_NULL_IDLE_TASK_RUNNER_H_
+
+#include "components/scheduler/child/single_thread_idle_task_runner.h"
+
+namespace scheduler {
+
+class NullIdleTaskRunner : public SingleThreadIdleTaskRunner {
+ public:
+  NullIdleTaskRunner();
+  void PostIdleTask(const tracked_objects::Location& from_here,
+                    const IdleTask& idle_task) override;
+
+  void PostNonNestableIdleTask(const tracked_objects::Location& from_here,
+                               const IdleTask& idle_task) override;
+
+  void PostIdleTaskAfterWakeup(const tracked_objects::Location& from_here,
+                               const IdleTask& idle_task) override;
+
+ protected:
+  ~NullIdleTaskRunner() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NullIdleTaskRunner);
+};
+
+}  // namespace scheduler
+
+#endif  // COMPONENTS_SCHEDULER_CHILD_NULL_IDLE_TASK_RUNNER_H_