Implement WebFrameScheduler and WebPageScheduler

components/scheduler/renderer/web_page_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 COMPONENTS_SCHEDULER_RENDERER_WEB_PAGE_SCHEDULER_IMPL_H_
+#define COMPONENTS_SCHEDULER_RENDERER_WEB_PAGE_SCHEDULER_IMPL_H_
+
+#include <set>
+
+#include "base/macros.h"
+#include "components/scheduler/scheduler_export.h"
+#include "third_party/WebKit/public/platform/WebPageScheduler.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}  // namespace base
+
+namespace scheduler {
+
+class RendererScheduler;
+class WebFrameSchedulerImpl;
+
+class SCHEDULER_EXPORT WebPageSchedulerImpl : public blink::WebPageScheduler {

[Sami, 2015/09/10 15:10:23]

Is the contract that PageScheduler must outlive all the FrameSchedulers that it
creates? Or do we need to support ones that outlive the PageScheduler? Might
want to add dchecks either way.

[alex clarke (OOO till 29th), 2015/09/10 15:56:24]

That's what I'm assuming.

 Or do we need to support ones that outlive the PageScheduler? Might

+ public:
+  explicit WebPageSchedulerImpl(RendererScheduler* render_scheduler);
+
+  ~WebPageSchedulerImpl() override;
+
+  // blink::WebPageScheduler implementation:
+  virtual void setPageInBackground(bool);
+  virtual blink::WebFrameScheduler* createFrameScheduler();
+
+  void Unregister(WebFrameSchedulerImpl* frame_scheduler);
+
+ private:
+  std::set<WebFrameSchedulerImpl*> frame_schedulers_;

[Sami, 2015/09/10 15:10:23]

Do we need this set for anything?

[alex clarke (OOO till 29th), 2015/09/10 15:56:24]

We will do if we want  setPageInBackground() to throttle / unthrottle background
task queues.

+  RendererScheduler* render_scheduler_;
+  bool background_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebPageSchedulerImpl);
+};
+
+}  // namespace scheduler
+
+#endif  // COMPONENTS_SCHEDULER_RENDERER_WEB_PAGE_SCHEDULER_IMPL_H_