CancelableTaskTracker::PostDelayedTask() support

base/task_runner.h

 // Copyright (c) 2012 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_TASK_RUNNER_H_
 #define BASE_TASK_RUNNER_H_
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
@@ skipping 110 matching lines @@
   //   * Results of |task| are shared with |reply| by binding a shared argument
   //     (a DataBuffer instance).
   //   * The DataLoader object has no special thread safety.
   //   * The DataLoader object can be deleted while |task| is still running,
   //     and the reply will cancel itself safely because it is bound to a
   //     WeakPtr<>.
   bool PostTaskAndReply(const tracked_objects::Location& from_here,
                         const Closure& task,
                         const Closure& reply);
 
+  bool PostDelayedTaskAndReply(const tracked_objects::Location& from_here,
+                               const Closure& task,
+                               const Closure& reply,
+                               TimeDelta delay);
+
  protected:
   friend struct TaskRunnerTraits;
 
   // Only the Windows debug build seems to need this: see
   // http://crbug.com/112250.
   friend class RefCountedThreadSafe<TaskRunner, TaskRunnerTraits>;
 
   TaskRunner();
   virtual ~TaskRunner();
 
   // Called when this object should be destroyed.  By default simply
   // deletes |this|, but can be overridden to do something else, like
   // delete on a certain thread.
   virtual void OnDestruct() const;
 };
 
 struct BASE_EXPORT TaskRunnerTraits {
   static void Destruct(const TaskRunner* task_runner);
 };
 
 }  // namespace base
 
 #endif  // BASE_TASK_RUNNER_H_