Schedule ResourceDispatch messages via a Filter

content/child/resource_scheduling_filter.h

+// Copyright (c) 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_CHILD_RESOURCE_SCHEDULING_FILTER_H_
+#define CONTENT_CHILD_RESOURCE_SCHEDULING_FILTER_H_
+
+#include "base/containers/hash_tables.h"
+#include "base/memory/weak_ptr.h"
+#include "base/single_thread_task_runner.h"
+#include "content/common/content_export.h"
+#include "ipc/message_filter.h"
+
+namespace content {
+class ResourceDispatcher;
+
+// This filter is used to dispatch resource messages on a specific
+// SingleThreadTaskRunner to facilitate task scheduling.
+class CONTENT_EXPORT ResourceSchedulingFilter : public IPC::MessageFilter {
+ public:
+  ResourceSchedulingFilter(const scoped_refptr<base::SingleThreadTaskRunner>&
+                               main_thread_task_runner,
+                           ResourceDispatcher* resource_dispatcher);
+
+  virtual bool OnMessageReceived(const IPC::Message& message) override;
+
+  virtual bool GetSupportedMessageClasses(
+      std::vector<uint32>* supported_message_classes) const override;
+
+ protected:
+  virtual ~ResourceSchedulingFilter();
+
+  void DispatchMessage(const IPC::Message& message);
+
+  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
+  ResourceDispatcher* resource_dispatcher_;  // NOT OWNED
+  base::WeakPtrFactory<ResourceSchedulingFilter> weak_ptr_factory_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_CHILD_RESOURCE_SCHEDULING_FILTER_H_