scheduler: Move the Blink scheduler into Blink

components/scheduler/child/web_task_runner_impl.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_WEB_TASK_RUNNER_H_
-#define COMPONENTS_SCHEDULER_CHILD_WEB_TASK_RUNNER_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/time/time.h"
-#include "components/scheduler/scheduler_export.h"
-#include "third_party/WebKit/public/platform/WebTaskRunner.h"
-
-namespace scheduler {
-class TaskQueue;
-
-class SCHEDULER_EXPORT WebTaskRunnerImpl : public blink::WebTaskRunner {
- public:
-  explicit WebTaskRunnerImpl(scoped_refptr<TaskQueue> task_queue);
-
-  ~WebTaskRunnerImpl() override;
-
-  // blink::WebTaskRunner implementation:
-  void postTask(const blink::WebTraceLocation& web_location,
-                blink::WebTaskRunner::Task* task) override;
-  void postDelayedTask(const blink::WebTraceLocation& web_location,
-                       blink::WebTaskRunner::Task* task,
-                       double delayMs) override;
-  bool runsTasksOnCurrentThread() override;
-  double virtualTimeSeconds() const override;
-  double monotonicallyIncreasingVirtualTimeSeconds() const override;
-  std::unique_ptr<blink::WebTaskRunner> clone() override;
-
-  // blink::WebTaskRunner::Task should be wrapped by base::Passed() when
-  // used with base::Bind(). See https://crbug.com/551356.
-  // runTask() is a helper to call blink::WebTaskRunner::Task::run from
-  // std::unique_ptr<blink::WebTaskRunner::Task>.
-  // runTask() is placed here because std::unique_ptr<> cannot be used from
-  // Blink.
-  static void runTask(std::unique_ptr<blink::WebTaskRunner::Task>);
-
- private:
-  base::TimeTicks Now() const;
-
-  scoped_refptr<TaskQueue> task_queue_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebTaskRunnerImpl);
-};
-
-}  // namespace scheduler
-
-#endif  // COMPONENTS_SCHEDULER_CHILD_WEB_TASK_RUNNER_H_