TaskScheduler: Make SchedulerWorkerThread own its delegate.

base/task_scheduler/scheduler_thread_pool.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_SCHEDULER_THREAD_POOL_H_
 #define BASE_TASK_SCHEDULER_SCHEDULER_THREAD_POOL_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 72 matching lines @@
   bool PostTaskWithSequence(std::unique_ptr<Task> task,
                             scoped_refptr<Sequence> sequence);
 
   // SchedulerThreadPoolInterface:
   void PostTaskWithSequenceNow(std::unique_ptr<Task> task,
                                scoped_refptr<Sequence> sequence) override;
 
  private:
   class SchedulerWorkerThreadDelegateImpl;
 
-  SchedulerThreadPool(const EnqueueSequenceCallback& enqueue_sequence_callback,
-                      TaskTracker* task_tracker,
+  SchedulerThreadPool(TaskTracker* task_tracker,
                       DelayedTaskManager* delayed_task_manager);
 
-  bool Initialize(ThreadPriority thread_priority, size_t max_threads);
+  bool Initialize(ThreadPriority thread_priority,
+                  size_t max_threads,
+                  const EnqueueSequenceCallback& enqueue_sequence_callback);
 
   // Wakes up the last thread from this thread pool to go idle, if any.
   void WakeUpOneThread();
 
   // Adds |worker_thread| to |idle_worker_threads_stack_|.
   void AddToIdleWorkerThreadsStack(SchedulerWorkerThread* worker_thread);
 
   // Pops one idle worker thread from |idle_worker_thread_stack_| and returns
   // it. Returns nullptr if |idle_worker_thread_stack_| is empty.
   SchedulerWorkerThread* PopOneIdleWorkerThread();
@@ skipping 14 matching lines @@
 
   // Stack of idle worker threads.
   SchedulerUniqueStack<SchedulerWorkerThread*> idle_worker_threads_stack_;
 
   // Signaled when all worker threads become idle.
   std::unique_ptr<ConditionVariable> idle_worker_threads_stack_cv_for_testing_;
 
   // Signaled once JoinForTesting() has returned.
   WaitableEvent join_for_testing_returned_;
 
-  // Delegate for all worker threads in this pool.
-  std::unique_ptr<SchedulerWorkerThread::Delegate> worker_thread_delegate_;
-
   TaskTracker* const task_tracker_;
   DelayedTaskManager* const delayed_task_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(SchedulerThreadPool);
 };
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_TASK_SCHEDULER_SCHEDULER_THREAD_POOL_H_