Move blink scheduler implementation into a component

content/child/scheduler/web_scheduler_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 CONTENT_CHILD_SCHEDULER_BASE_WEB_SCHEDULER_IMPL_H_
-#define CONTENT_CHILD_SCHEDULER_BASE_WEB_SCHEDULER_IMPL_H_
-
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/time/time.h"
-#include "content/common/content_export.h"
-#include "third_party/WebKit/public/platform/WebScheduler.h"
-#include "third_party/WebKit/public/platform/WebThread.h"
-
-namespace base {
-class SingleThreadTaskRunner;
-}
-
-namespace content {
-
-class ChildScheduler;
-class SingleThreadIdleTaskRunner;
-
-class CONTENT_EXPORT WebSchedulerImpl : public blink::WebScheduler {
- public:
-  WebSchedulerImpl(
-      ChildScheduler* child_scheduler,
-      scoped_refptr<SingleThreadIdleTaskRunner> idle_task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> loading_task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> timer_task_runner);
-  ~WebSchedulerImpl() override;
-
-  // blink::WebScheduler implementation:
-  virtual bool shouldYieldForHighPriorityWork();
-  virtual bool canExceedIdleDeadlineIfRequired();
-  virtual void postIdleTask(const blink::WebTraceLocation& location,
-                            blink::WebThread::IdleTask* task);
-  virtual void postNonNestableIdleTask(const blink::WebTraceLocation& location,
-                                       blink::WebThread::IdleTask* task);
-  virtual void postIdleTaskAfterWakeup(const blink::WebTraceLocation& location,
-                                       blink::WebThread::IdleTask* task);
-  virtual void postLoadingTask(const blink::WebTraceLocation& location,
-                               blink::WebThread::Task* task);
-  virtual void postTimerTask(const blink::WebTraceLocation& location,
-                             blink::WebThread::Task* task,
-                             long long delayMs);
-
- private:
-  static void runIdleTask(scoped_ptr<blink::WebThread::IdleTask> task,
-                          base::TimeTicks deadline);
-  static void runTask(scoped_ptr<blink::WebThread::Task> task);
-
-  ChildScheduler* child_scheduler_;  // NOT OWNED
-  scoped_refptr<SingleThreadIdleTaskRunner> idle_task_runner_;
-  scoped_refptr<base::SingleThreadTaskRunner> loading_task_runner_;
-  scoped_refptr<base::SingleThreadTaskRunner> timer_task_runner_;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_CHILD_SCHEDULER_BASE_WEB_SCHEDULER_IMPL_H_