TaskScheduler: TimeDelta instead of TimeTicks in Task's constructor.

base/task_scheduler/task.cc

 // Copyright 2016 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.
 
 #include "base/task_scheduler/task.h"
 
 namespace base {
 namespace internal {
 
 Task::Task(const tracked_objects::Location& posted_from,
            const Closure& task,
            const TaskTraits& traits,
-           const TimeTicks& delayed_run_time)
+           const TimeDelta& delay)
     : PendingTask(posted_from,
                   task,
-                  delayed_run_time,
+                  delay.is_zero() ? TimeTicks() : TimeTicks::Now() + delay,
                   false),  // Not nestable.
       traits(traits) {}
 
 Task::~Task() = default;
 
 }  // namespace internal
 }  // namespace base