Revert of Revert of Add a WorkerScheduler and a WebThreadImplForWorker

content/renderer/scheduler/webthread_impl_for_renderer_scheduler.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_RENDERER_SCHEDULER_WEBTHREAD_IMPL_FOR_RENDERER_SCHEDULER_H_
+#define CONTENT_RENDERER_SCHEDULER_WEBTHREAD_IMPL_FOR_RENDERER_SCHEDULER_H_
+
+#include "base/containers/scoped_ptr_hash_map.h"
+#include "content/child/webthread_base.h"
+
+namespace content {
+
+class RendererScheduler;
+
+class CONTENT_EXPORT WebThreadImplForRendererScheduler : public WebThreadBase {
+ public:
+  explicit WebThreadImplForRendererScheduler(RendererScheduler* scheduler);
+  virtual ~WebThreadImplForRendererScheduler();
+
+  // blink::WebThread implementation.
+  blink::PlatformThreadId threadId() const override;
+
+  // WebThreadBase implementation.
+  base::SingleThreadTaskRunner* TaskRunner() const override;
+  SingleThreadIdleTaskRunner* IdleTaskRunner() const override;
+
+ private:
+  base::MessageLoop* MessageLoop() const override;
+  void AddTaskObserverInternal(
+      base::MessageLoop::TaskObserver* observer) override;
+  void RemoveTaskObserverInternal(
+      base::MessageLoop::TaskObserver* observer) override;
+
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  scoped_refptr<SingleThreadIdleTaskRunner> idle_task_runner_;
+  RendererScheduler* scheduler_;  // Not owned.
+  blink::PlatformThreadId thread_id_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_SCHEDULER_WEBTHREAD_IMPL_FOR_RENDERER_SCHEDULER_H_