Add Thread Standby Policy SchedulerWorkerPoolImpl

components/task_scheduler_util/initialization_util.cc

Index: components/task_scheduler_util/initialization_util.cc
diff --git a/components/task_scheduler_util/initialization_util.cc b/components/task_scheduler_util/initialization_util.cc
index ca94f42171117f036be7702fe7e8116de4395bcf..e86ae3cb1d54731d0e6ad84ac5bad81f371d2ced 100644
--- a/components/task_scheduler_util/initialization_util.cc
+++ b/components/task_scheduler_util/initialization_util.cc
@@ -22,6 +22,9 @@ namespace task_scheduler_util {
 
 namespace {
 
+using StandbyThreadPolicy =
+    base::SchedulerWorkerPoolParams::StandbyThreadPolicy;
+
 enum WorkerPoolType : size_t {
   BACKGROUND_WORKER_POOL = 0,
   BACKGROUND_FILE_IO_WORKER_POOL,
@@ -31,6 +34,7 @@ enum WorkerPoolType : size_t {
 };
 
 struct WorkerPoolVariationValues {
+  StandbyThreadPolicy standby_thread_policy;
   int threads = 0;
   base::TimeDelta detach_period;
 };
@@ -70,6 +74,10 @@ WorkerPoolVariationValues StringToWorkerPoolVariationValues(
     values.threads = std::min(maximum, std::max(minimum, threads));
     values.detach_period =
         base::TimeDelta::FromMilliseconds(detach_milliseconds);
+    values.standby_thread_policy =
+        (tokens.size() >= 6 && tokens[5] == "lazy")
+            ? StandbyThreadPolicy::LAZY
+            : StandbyThreadPolicy::ONE;
     return values;
   }
   DLOG(ERROR) << "Invalid Worker Pool Descriptor: " << pool_descriptor;
@@ -131,6 +139,7 @@ bool InitializeDefaultTaskScheduler(
     params_vector.emplace_back(predefined_params.name,
                                predefined_params.priority_hint,
                                predefined_params.io_restriction,
+                               variation_values.standby_thread_policy,
                                variation_values.threads,
                                variation_values.detach_period);
   }