Add functions to expand PostDelayedTask interface.

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_
 #pragma once
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
 #include "base/memory/ref_counted.h"
+#include "base/time.h"
 
 namespace tracked_objects {
 class Location;
 } // namespace tracked_objects
 
 namespace base {
 
 struct TaskRunnerTraits;
 
 // A TaskRunner is an object that runs posted tasks (in the form of
@@ skipping 42 matching lines @@
   // Equivalent to PostDelayedTask(from_here, task, 0).
   bool PostTask(const tracked_objects::Location& from_here,
                 const Closure& task);
 
   // Like PostTask, but tries to run the posted task only after
   // |delay_ms| has passed.
   //
   // It is valid for an implementation to ignore |delay_ms|; that is,
   // to have PostDelayedTask behave the same as PostTask.
   //
-  // TODO(akalin): Make PostDelayedTask use TimeDelta instead.
+  // TODO(tedv): Make PostDelayedTask use TimeDelta instead.
   virtual bool PostDelayedTask(const tracked_objects::Location& from_here,
                                const Closure& task,
                                int64 delay_ms) = 0;
+  virtual bool PostDelayedTask(const tracked_objects::Location& from_here,
+                               const Closure& task,
+                               base::TimeDelta delay) = 0;
 
   // Returns true if the current thread is a thread on which a task
   // may be run, and false if no task will be run on the current
   // thread.
   //
   // It is valid for an implementation to always return true, or in
   // general to use 'true' as a default value.
   virtual bool RunsTasksOnCurrentThread() const = 0;
 
   // Posts |task| on the current TaskRunner.  On completion, |reply|
@@ skipping 57 matching lines @@
   virtual void OnDestruct() const;
 };
 
 struct BASE_EXPORT TaskRunnerTraits {
   static void Destruct(const TaskRunner* task_runner);
 };
 
 }  // namespace base
 
 #endif  // BASE_TASK_RUNNER_H_