Add base::TaskTraits::Override().

base/task_scheduler/post_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/post_task.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/task_scheduler/scoped_set_task_priority_for_current_thread.h"
@@ skipping 16 matching lines @@
     return true;
   }
 
   const TaskTraits traits_;
 };
 
 // Returns TaskTraits based on |traits|. If TaskPriority hasn't been set
 // explicitly in |traits|, the returned TaskTraits have the current
 // TaskPriority.
 TaskTraits GetTaskTraitsWithExplicitPriority(const TaskTraits& traits) {
-  return traits.priority_set_explicitly()
-             ? traits
-             : TaskTraits(traits).WithPriority(
-                   internal::GetTaskPriorityForCurrentThread());
+  if (traits.priority_set_explicitly())
+    return traits;
+  return TaskTraits::Override(traits,
+                              {internal::GetTaskPriorityForCurrentThread()});
 }
 
 }  // namespace
 
 void PostTask(const tracked_objects::Location& from_here, OnceClosure task) {
   PostDelayedTask(from_here, std::move(task), TimeDelta());
 }
 
 void PostDelayedTask(const tracked_objects::Location& from_here,
                      OnceClosure task,
@@ skipping 60 matching lines @@
 scoped_refptr<SingleThreadTaskRunner> CreateCOMSTATaskRunnerWithTraits(
     const TaskTraits& traits) {
   DCHECK(TaskScheduler::GetInstance())
       << "Ref. Prerequisite section of post_task.h";
   return TaskScheduler::GetInstance()->CreateCOMSTATaskRunnerWithTraits(
       GetTaskTraitsWithExplicitPriority(traits));
 }
 #endif  // defined(OS_WIN)
 
 }  // namespace base