Add TaskScheduler::InitParams and accept it in TaskSchedulerImpl constructor.

base/task_scheduler/scheduler_worker_pool_params.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_WORKER_POOL_PARAMS_H_
 #define BASE_TASK_SCHEDULER_SCHEDULER_WORKER_POOL_PARAMS_H_
 
 #include <string>
 
 #include "base/task_scheduler/scheduler_worker_params.h"
@@ skipping 15 matching lines @@
   // Construct a scheduler worker pool parameter object. |name| will be used to
   // label the pool's threads ("TaskScheduler" + |name| + index) and histograms
   // ("TaskScheduler." + histogram name + "." + |name| + extra suffixes). The
   // pool will contain up to |max_threads|. |priority_hint| is the preferred
   // thread priority; the actual thread priority depends on shutdown state and
   // platform capabilities. |standby_thread_policy| indicates whether an idle
   // thread should be kept alive on standby. |suggested_reclaim_time| sets a
   // suggestion on when to reclaim idle threads. The pool is free to ignore this
   // value for performance or correctness reasons. |backward_compatibility|
   // indicates whether backward compatibility is enabled.
+  //
+  // TODO(fdoray): Remove this constructor. https://crbug.com/690706
   SchedulerWorkerPoolParams(
       const std::string& name,
       ThreadPriority priority_hint,
       StandbyThreadPolicy standby_thread_policy,
       int max_threads,
       TimeDelta suggested_reclaim_time,
       SchedulerBackwardCompatibility backward_compatibility =
           SchedulerBackwardCompatibility::DISABLED);
+
+  // Same as above, with no explicit |name| and |priority_hint|.
+  SchedulerWorkerPoolParams(
+      StandbyThreadPolicy standby_thread_policy,
+      int max_threads,
+      TimeDelta suggested_reclaim_time,
+      SchedulerBackwardCompatibility backward_compatibility =
+          SchedulerBackwardCompatibility::DISABLED);
+
   SchedulerWorkerPoolParams(const SchedulerWorkerPoolParams& other);
   SchedulerWorkerPoolParams& operator=(const SchedulerWorkerPoolParams& other);
 
   const std::string& name() const { return name_; }
   ThreadPriority priority_hint() const { return priority_hint_; }
   StandbyThreadPolicy standby_thread_policy() const {
     return standby_thread_policy_;
   }
   size_t max_threads() const { return max_threads_; }
   TimeDelta suggested_reclaim_time() const { return suggested_reclaim_time_; }
   SchedulerBackwardCompatibility backward_compatibility() const {
     return backward_compatibility_;
   }
 
  private:
+  // TODO(fdoray): Remove |name_| and |priority_hint_|. https://crbug.com/690706
   std::string name_;
   ThreadPriority priority_hint_;
   StandbyThreadPolicy standby_thread_policy_;
   size_t max_threads_;
   TimeDelta suggested_reclaim_time_;
   SchedulerBackwardCompatibility backward_compatibility_;
 };
 
 }  // namespace base
 
 #endif  // BASE_TASK_SCHEDULER_SCHEDULER_WORKER_POOL_PARAMS_H_