Refactor History's CommitLaterTask with CancelableCallback

base/task/cancelable_task_tracker.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.
 
 // CancelableTaskTracker posts tasks (in the form of a Closure) to a
 // TaskRunner, and is able to cancel the task later if it's not needed
 // anymore.  On destruction, CancelableTaskTracker will cancel all
 // tracked tasks.
 //
 // Each cancelable task can be associated with a reply (also a Closure). After
@@ skipping 77 matching lines @@
         task_runner,
         from_here,
         base::Bind(&base::internal::ReturnAsParamAdapter<TaskReturnType>,
                    task,
                    base::Unretained(result)),
         base::Bind(&base::internal::ReplyAdapter<TaskReturnType, ReplyArgType>,
                    reply,
                    base::Owned(result)));
   }
 
+  TaskId PostDelayedTask(base::TaskRunner* task_runner,
+                         const tracked_objects::Location& from_here,
+                         const base::Closure& task,
+                         base::TimeDelta delay);
+
   // Creates a tracked TaskId and an associated IsCanceledCallback. Client can
   // later call TryCancel() with the returned TaskId, and run |is_canceled_cb|
   // from any thread to check whether the TaskId is canceled.
   //
   // The returned task ID is tracked until the last copy of
   // |is_canceled_cb| is destroyed.
   //
   // Note. This function is used to address some special cancelation requirement
   // in existing code. You SHOULD NOT need this function in new code.
   TaskId NewTrackedTaskId(IsCanceledCallback* is_canceled_cb);
@@ skipping 25 matching lines @@
   SequenceChecker sequence_checker_;
 
   base::WeakPtrFactory<CancelableTaskTracker> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CancelableTaskTracker);
 };
 
 }  // namespace base
 
 #endif  // BASE_TASK_CANCELABLE_TASK_TRACKER_H_