TaskScheduler: Bump thread priority during shutdown.

base/task_scheduler/task_tracker.h

 // 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.
 
 #ifndef BASE_TASK_SCHEDULER_TASK_TRACKER_H_
 #define BASE_TASK_SCHEDULER_TASK_TRACKER_H_
 
 #include <memory>
 
 #include "base/base_export.h"
@@ skipping 31 matching lines @@
 
   // Runs |task| unless the current shutdown state prevents that. WillPostTask()
   // must have allowed |task| to be posted.
   void RunTask(const Task* task);
 
   // Returns true if shutdown has completed.
   bool IsShutdownComplete() const;
 
   // Returns true while shutdown is in progress (i.e. Shutdown() has been called
   // but hasn't returned).
-  bool IsShuttingDownForTesting() const;
+  bool IsShutdownInProgress() const;
+
+  // Causes IsShutdownInProgress() to return true. Shutdown() cannot be called
+  // after this.

[robliao, 2016/07/19 22:41:28]

Comment why one would call this instead of Shutdown().

[fdoray, 2016/07/20 18:22:21]

Done.

+  void SetIsShutdownInProgressForTesting();
 
  private:
   class State;
 
   // Called before WillPostTask() informs the tracing system that a task has
   // been posted. Updates |num_tasks_blocking_shutdown_| if necessary and
   // returns true if the current shutdown state allows the task to be posted.
   bool BeforePostTask(TaskShutdownBehavior shutdown_behavior);
 
   // Called before a task with |shutdown_behavior| is run by RunTask(). Updates
@@ skipping 24 matching lines @@
   // Number of BLOCK_SHUTDOWN tasks posted during shutdown.
   HistogramBase::Sample num_block_shutdown_tasks_posted_during_shutdown_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(TaskTracker);
 };
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_TASK_SCHEDULER_TASK_TRACKER_H_