TaskScheduler: Add internal::GetTaskPriorityForCurrentThread().

base/task_scheduler/task_tracker.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_tracker.h"
 
 #include <limits>
 
 #include "base/callback.h"
 #include "base/debug/task_annotator.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/sequence_token.h"
 #include "base/synchronization/condition_variable.h"
+#include "base/task_scheduler/scoped_set_task_priority_for_current_thread.h"
 #include "base/threading/sequenced_task_runner_handle.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/trace_event.h"
 #include "base/values.h"
 
 namespace base {
 namespace internal {
 
 namespace {
@@ skipping 196 matching lines @@
     // singletons. Therefore, it isn't necessary to reset the singleton allowed
     // bit after running the task.
     ThreadRestrictions::SetSingletonAllowed(
         task->traits.shutdown_behavior() !=
         TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN);
 
     const bool previous_wait_allowed =
         ThreadRestrictions::SetWaitAllowed(task->traits.with_wait());
 
     {
-      // Set up SequenceToken as expected for the scope of the task.
       ScopedSetSequenceTokenForCurrentThread
           scoped_set_sequence_token_for_current_thread(sequence_token);
+      ScopedSetTaskPriorityForCurrentThread
+          scoped_set_task_priority_for_current_thread(task->traits.priority());
 
       // Set up TaskRunnerHandle as expected for the scope of the task.
       std::unique_ptr<SequencedTaskRunnerHandle> sequenced_task_runner_handle;
       std::unique_ptr<ThreadTaskRunnerHandle> single_thread_task_runner_handle;
       DCHECK(!task->sequenced_task_runner_ref ||
              !task->single_thread_task_runner_ref);
       if (task->sequenced_task_runner_ref) {
         sequenced_task_runner_handle.reset(
             new SequencedTaskRunnerHandle(task->sequenced_task_runner_ref));
       } else if (task->single_thread_task_runner_ref) {
@@ skipping 201 matching lines @@
       subtle::NoBarrier_AtomicIncrement(&num_pending_undelayed_tasks_, -1);
   DCHECK_GE(new_num_pending_undelayed_tasks, 0);
   if (new_num_pending_undelayed_tasks == 0) {
     AutoSchedulerLock auto_lock(flush_lock_);
     flush_cv_->Signal();
   }
 }
 
 }  // namespace internal
 }  // namespace base