Add TaskScheduler::Create and TaskScheduler::CreateAndStartWithDefaultParams.

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"
@@ skipping 21 matching lines @@
       background_blocking_worker_pool_params(
           background_blocking_worker_pool_params_in),
       foreground_worker_pool_params(foreground_worker_pool_params_in),
       foreground_blocking_worker_pool_params(
           foreground_blocking_worker_pool_params_in) {}
 
 TaskScheduler::InitParams::~InitParams() = default;
 
 #if !defined(OS_NACL)
 // static
-void TaskScheduler::CreateAndSetSimpleTaskScheduler(StringPiece name) {
+void TaskScheduler::CreateAndStartWithDefaultParams(StringPiece name) {
   using StandbyThreadPolicy = SchedulerWorkerPoolParams::StandbyThreadPolicy;
 
   // Values were chosen so that:
   // * There are few background threads.
   // * Background threads never outnumber foreground threads.
   // * The system is utilized maximally by foreground threads.
   const int num_cores = SysInfo::NumberOfProcessors();
   constexpr int kBackgroundMaxThreads = 1;
   constexpr int kBackgroundBlockingMaxThreads = 2;
   const int kForegroundMaxThreads = std::max(1, num_cores);
   const int kForegroundBlockingMaxThreads = std::max(2, num_cores);
 
   constexpr TimeDelta kSuggestedReclaimTime = TimeDelta::FromSeconds(30);
 
-  CreateAndSetDefaultTaskScheduler(
-      name, {{StandbyThreadPolicy::LAZY, kBackgroundMaxThreads,
-              kSuggestedReclaimTime},
-             {StandbyThreadPolicy::LAZY, kBackgroundBlockingMaxThreads,
-              kSuggestedReclaimTime},
-             {StandbyThreadPolicy::LAZY, kForegroundMaxThreads,
-              kSuggestedReclaimTime},
-             {StandbyThreadPolicy::LAZY, kForegroundBlockingMaxThreads,
-              kSuggestedReclaimTime}});
+  Create(name);
+  GetInstance()->Start(
+      {{StandbyThreadPolicy::LAZY, kBackgroundMaxThreads,
+        kSuggestedReclaimTime},
+       {StandbyThreadPolicy::LAZY, kBackgroundBlockingMaxThreads,
+        kSuggestedReclaimTime},
+       {StandbyThreadPolicy::LAZY, kForegroundMaxThreads,
+        kSuggestedReclaimTime},
+       {StandbyThreadPolicy::LAZY, kForegroundBlockingMaxThreads,
+        kSuggestedReclaimTime}});
+}
+
+// static
+void TaskScheduler::CreateAndSetSimpleTaskScheduler(StringPiece name) {
+  CreateAndStartWithDefaultParams(name);
 }
 #endif  // !defined(OS_NACL)
 
+void TaskScheduler::Create(StringPiece name) {
+  SetInstance(MakeUnique<internal::TaskSchedulerImpl>(name));
+}
+
 void TaskScheduler::CreateAndSetDefaultTaskScheduler(
     StringPiece name,
     const InitParams& init_params) {
-  SetInstance(MakeUnique<internal::TaskSchedulerImpl>(name));
+  Create(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