TaskScheduler: Initialize TaskTraits with the priority of the current thread.

base/task_scheduler/task_traits.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_traits.h"
 
 #include <stddef.h>
 
 #include <ostream>
 
 #include "base/logging.h"
+#include "base/task_scheduler/scoped_set_task_priority_for_current_thread.h"
 
 namespace base {
 
 // Do not rely on defaults hard-coded below beyond the guarantees described in
 // the header; anything else is subject to change. Tasks should explicitly
 // request defaults if the behavior is critical to the task.
 TaskTraits::TaskTraits()
     : with_file_io_(false),
       with_wait_(false),
-      priority_(TaskPriority::BACKGROUND),
+      priority_(internal::GetTaskPriorityForCurrentThread()),
       shutdown_behavior_(TaskShutdownBehavior::SKIP_ON_SHUTDOWN) {}
 
 TaskTraits::~TaskTraits() = default;
 
 TaskTraits& TaskTraits::WithFileIO() {
   with_file_io_ = true;
   return *this;
 }
 
 TaskTraits& TaskTraits::WithWait() {
@@ skipping 44 matching lines @@
   return os;
 }
 
 std::ostream& operator<<(std::ostream& os,
                          const TaskShutdownBehavior& shutdown_behavior) {
   os << TaskShutdownBehaviorToString(shutdown_behavior);
   return os;
 }
 
 }  // namespace base