NOT FOR REVIEW: Adding prioritized incoming task queue to renderers

base/message_loop/high_priority_task_runner.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 BASE_MESSAGE_LOOP_HIGH_PRIORITY_TASK_RUNNER_H_
+#define BASE_MESSAGE_LOOP_HIGH_PRIORITY_TASK_RUNNER_H_
+
+#include "base/base_export.h"
+#include "base/callback_forward.h"
+#include "base/memory/ref_counted.h"
+
+namespace tracked_objects {
+class Location;
+}  // namespace tracked_objects
+
+namespace base {
+
+namespace internal {
+class IncomingTaskQueue;
+}
+
+class MessageLoop;
+class TaskQueue;
+
+class BASE_EXPORT HighPriorityTaskRunner
+    : public RefCountedThreadSafe<HighPriorityTaskRunner> {
+ public:
+  explicit HighPriorityTaskRunner(MessageLoop* message_loop);
+
+  void PostTask(const tracked_objects::Location& from_here,
+                const Closure& task);
+
+  void ReloadWorkQueue(TaskQueue* target_work_queue);
+
+ private:
+  friend class RefCountedThreadSafe<HighPriorityTaskRunner>;
+
+  virtual ~HighPriorityTaskRunner();
+
+  scoped_refptr<internal::IncomingTaskQueue> incoming_queue_;
+
+  DISALLOW_COPY_AND_ASSIGN(HighPriorityTaskRunner);
+};
+
+}  // namespace base
+
+#endif  // BASE_MESSAGE_LOOP_HIGH_PRIORITY_TASK_RUNNER_H_