content: Add RendererScheduler.

content/renderer/scheduler/web_scheduler_impl.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_WEB_SCHEDULER_IMPL_H_
+#define CONTENT_RENDERER_SCHEDULER_WEB_SCHEDULER_IMPL_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/time/time.h"
+#include "third_party/WebKit/public/platform/WebScheduler.h"
+
+namespace content {
+
+class RendererScheduler;
+class SingleThreadIdleTaskRunner;
+
+class WebSchedulerImpl : public blink::WebScheduler {
+ public:
+  WebSchedulerImpl(RendererScheduler* renderer_scheduler);
+  virtual ~WebSchedulerImpl();
+
+  virtual bool shouldYieldForHighPriorityWork();
+  virtual void postIdleTask(const blink::WebTraceLocation& location,
+                            blink::WebScheduler::IdleTask* task);
+  virtual void shutdown();
+
+ private:
+  static void runIdleTask(blink::WebScheduler::IdleTask* task,
+                          base::TimeTicks deadline);
+
+  RendererScheduler* renderer_scheduler_;
+  scoped_refptr<SingleThreadIdleTaskRunner> idle_task_runner_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_SCHEDULER_WEB_SCHEDULER_IMPL_H_