NOT FOR REVIEW: Adding prioritized incoming task queue to renderers

content/renderer/renderer_message_loop.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_RENDERER_MESSAGE_LOOP_H_
+#define CONTENT_RENDERER_RENDERER_MESSAGE_LOOP_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "base/pending_task.h"
+
+namespace base {
+class HighPriorityTaskRunner;
+}
+
+namespace content {
+
+class RendererMessageLoop : public base::MessageLoop {
+ public:
+  RendererMessageLoop();
+  explicit RendererMessageLoop(scoped_ptr<base::MessagePump> pump);
+  virtual ~RendererMessageLoop();
+
+  void EnableHighPriorityIncomingTaskQueue();
+
+ protected:
+  virtual void ReloadWorkQueue() OVERRIDE;
+  virtual base::TaskQueue& SelectNextWorkQueue() OVERRIDE;
+
+ private:
+  base::TaskQueue high_priority_work_queue_;
+  scoped_refptr<base::HighPriorityTaskRunner> high_priority_task_runner_;
+
+  int normal_work_queue_deficit_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_RENDERER_MESSAGE_LOOP_H_