Add a WorkerScheduler and a WebThreadImplForWorker

content/child/scheduler/null_worker_scheduler.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
+// 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_NULL_RENDERER_SCHEDULER_H_
-#define CONTENT_RENDERER_SCHEDULER_NULL_RENDERER_SCHEDULER_H_
+#ifndef CONTENT_CHILD_SCHEDULER_NULL_WORKER_SCHEDULER_H_
+#define CONTENT_CHILD_SCHEDULER_NULL_WORKER_SCHEDULER_H_
 
-#include "content/renderer/scheduler/renderer_scheduler.h"
+#include "content/child/scheduler/worker_scheduler.h"
 
 namespace content {
 
-class NullRendererScheduler : public RendererScheduler {
+class NullWorkerScheduler : public WorkerScheduler {
  public:
-  NullRendererScheduler();
-  ~NullRendererScheduler() override;
+  NullWorkerScheduler();
+  ~NullWorkerScheduler() override;
 
   scoped_refptr<base::SingleThreadTaskRunner> DefaultTaskRunner() override;
-  scoped_refptr<base::SingleThreadTaskRunner> CompositorTaskRunner() override;
-  scoped_refptr<base::SingleThreadTaskRunner> LoadingTaskRunner() override;
   scoped_refptr<SingleThreadIdleTaskRunner> IdleTaskRunner() override;
 
-  void WillBeginFrame(const cc::BeginFrameArgs& args) override;
-  void BeginFrameNotExpectedSoon() override;
-  void DidCommitFrameToCompositor() override;
-  void DidReceiveInputEventOnCompositorThread(
-      const blink::WebInputEvent& web_input_event) override;
-  void DidAnimateForInputOnCompositorThread() override;
-  bool IsHighPriorityWorkAnticipated() override;
-  bool ShouldYieldForHighPriorityWork() override;
-  bool CanExceedIdleDeadlineIfRequired() const override;
   void AddTaskObserver(base::MessageLoop::TaskObserver* task_observer) override;
   void RemoveTaskObserver(
       base::MessageLoop::TaskObserver* task_observer) override;
+  bool CanExceedIdleDeadlineIfRequired() const override;
+  void Init() override;
   void Shutdown() override;
 
  private:
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   scoped_refptr<SingleThreadIdleTaskRunner> idle_task_runner_;
 
-  DISALLOW_COPY_AND_ASSIGN(NullRendererScheduler);
+  DISALLOW_COPY_AND_ASSIGN(NullWorkerScheduler);
 };
 
 }  // namespace content
 
-#endif  // CONTENT_RENDERER_SCHEDULER_NULL_RENDERER_SCHEDULER_H_
+#endif  // CONTENT_CHILD_SCHEDULER_NULL_WORKER_SCHEDULER_H_