Worker: Introduce per-global-scope task scheduler

third_party/WebKit/Source/platform/scheduler/child/worker_scheduler.cc

Index: third_party/WebKit/Source/platform/scheduler/child/worker_scheduler.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler.cc b/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler.cc
index 1bddca0a91d1dcad3f3bed554309e42547a41dff..d3ca3a9c7f017b8d65a839a60b96b86c46fe11e1 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler.cc
+++ b/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler.cc
@@ -14,7 +14,8 @@
 namespace blink {
 namespace scheduler {
 
-WorkerScheduler::WorkerScheduler() {}
+WorkerScheduler::WorkerScheduler(std::unique_ptr<SchedulerHelper> helper)
+    : helper_(std::move(helper)) {}
 
 WorkerScheduler::~WorkerScheduler() {}
 
@@ -24,5 +25,15 @@ std::unique_ptr<WorkerScheduler> WorkerScheduler::Create(
   return base::WrapUnique(new WorkerSchedulerImpl(std::move(main_task_runner)));
 }
 
+scoped_refptr<TaskQueue> WorkerScheduler::CreateUnthrottledTaskRunner(
+    TaskQueue::QueueType queue_type) {
+  helper_->CheckOnValidThread();
+  scoped_refptr<TaskQueue> unthrottled_task_queue(
+      helper_->NewTaskQueue(TaskQueue::Spec(queue_type)
+                                .SetShouldMonitorQuiescence(true)
+                                .SetTimeDomain(nullptr)));
+  return unthrottled_task_queue;
+}
+
 }  // namespace scheduler
 }  // namespace blink