Separate the create and start phases in TaskSchedulerImpl.

base/task_scheduler/task_scheduler.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_scheduler.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
 #include "base/sys_info.h"
 #include "base/task_scheduler/scheduler_worker_pool_params.h"
 #include "base/task_scheduler/task_scheduler_impl.h"
 #include "base/threading/platform_thread.h"
 #include "base/time/time.h"
 
 namespace base {
 
 namespace {
 
@@ skipping 41 matching lines @@
              {StandbyThreadPolicy::LAZY, kForegroundMaxThreads,
               kSuggestedReclaimTime},
              {StandbyThreadPolicy::LAZY, kForegroundBlockingMaxThreads,
               kSuggestedReclaimTime}});
 }
 #endif  // !defined(OS_NACL)
 
 void TaskScheduler::CreateAndSetDefaultTaskScheduler(
     StringPiece name,
     const InitParams& init_params) {
-  SetInstance(internal::TaskSchedulerImpl::Create(name, init_params));
+  SetInstance(MakeUnique<internal::TaskSchedulerImpl>(name));
+  GetInstance()->Start(init_params);
 }
 
 // static
 void TaskScheduler::SetInstance(std::unique_ptr<TaskScheduler> task_scheduler) {
   delete g_task_scheduler;
   g_task_scheduler = task_scheduler.release();
 }
 
 // static
 TaskScheduler* TaskScheduler::GetInstance() {
   return g_task_scheduler;
 }
 
 }  // namespace base