Always use TaskScheduler::InitParams to initialize a TaskScheduler.

base/task_scheduler/scheduler_worker_pool_impl.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/scheduler_worker_pool_impl.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <utility>
@@ skipping 237 matching lines @@
     DCHECK(!workers_created_.IsSet());
 #endif
 
     DCHECK(workers_.empty());
     workers_.resize(params.max_threads());
 
     // Create workers in reverse order of index so that the worker with the
     // highest index is at the bottom of the idle stack.
     for (int index = params.max_threads() - 1; index >= 0; --index) {
       workers_[index] = make_scoped_refptr(
-          new SchedulerWorker(params.priority_hint(),
+          new SchedulerWorker(priority_hint_,
                               MakeUnique<SchedulerWorkerDelegateImpl>(
                                   this, re_enqueue_sequence_callback_, index),
                               task_tracker_, params.backward_compatibility()));
 
       if (index >= num_wake_ups_before_start_)
         idle_workers_stack_.Push(workers_[index].get());
     }
 
 #if DCHECK_IS_ON()
     workers_created_.Set();
@@ skipping 333 matching lines @@
   AutoSchedulerLock auto_lock(idle_workers_stack_lock_);
   idle_workers_stack_.Remove(worker);
 }
 
 bool SchedulerWorkerPoolImpl::CanWorkerDetachForTesting() {
   return !worker_detachment_disallowed_.IsSet();
 }
 
 }  // namespace internal
 }  // namespace base