content: Add RendererScheduler.

content/renderer/scheduler/null_renderer_scheduler.h

+// Copyright 2014 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_
+
+#include "content/renderer/scheduler/renderer_scheduler.h"
+
+namespace content {
+
+class NullRendererScheduler : public RendererScheduler {
+ public:
+  NullRendererScheduler();
+  ~NullRendererScheduler() override;
+
+  scoped_refptr<base::SingleThreadTaskRunner> DefaultTaskRunner() override;
+  scoped_refptr<base::SingleThreadTaskRunner> CompositorTaskRunner() override;
+  scoped_refptr<SingleThreadIdleTaskRunner> IdleTaskRunner() override;
+
+  void WillBeginFrame(const cc::BeginFrameArgs& args) override;
+  void DidCommitFrameToCompositor() override;
+  void DidReceiveInputEvent() override;
+  bool ShouldYieldForHighPriorityWork() override;
+  void Shutdown() override;
+
+ private:
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  scoped_refptr<SingleThreadIdleTaskRunner> idle_task_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(NullRendererScheduler);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_SCHEDULER_NULL_RENDERER_SCHEDULER_H_