scheduler: Implement WebFrameScheduler and WebPageScheduler

components/scheduler/renderer/web_frame_host_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_FRAME_HOST_SCHEDULER_IMPL_H_
+#define COMPONENTS_SCHEDULER_RENDERER_WEB_FRAME_HOST_SCHEDULER_IMPL_H_
+
+#include <set>
+
+#include "base/macros.h"
+#include "components/scheduler/scheduler_export.h"
+#include "third_party/WebKit/public/platform/WebFrameHostScheduler.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}  // namespace base
+
+namespace scheduler {
+
+class RendererScheduler;
+class WebFrameSchedulerImpl;
+
+class SCHEDULER_EXPORT WebFrameHostSchedulerImpl
+    : public blink::WebFrameHostScheduler {
+ public:
+  explicit WebFrameHostSchedulerImpl(RendererScheduler* render_scheduler);
+
+  ~WebFrameHostSchedulerImpl() override;
+
+  // blink::WebFrameHostScheduler implementation:
+  virtual void setPageInBackground(bool background);
+  virtual blink::WebFrameScheduler* createFrameScheduler();
+
+  void Unregister(WebFrameSchedulerImpl* frame_scheduler);
+
+ private:
+  std::set<WebFrameSchedulerImpl*> frame_schedulers_;
+  RendererScheduler* render_scheduler_;
+  bool background_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebFrameHostSchedulerImpl);
+};
+
+}  // namespace scheduler
+
+#endif  // COMPONENTS_SCHEDULER_RENDERER_WEB_FRAME_HOST_SCHEDULER_IMPL_H_