Worker: Introduce per-global-scope task scheduler

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

Index: third_party/WebKit/Source/platform/scheduler/child/worker_scheduler_impl.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler_impl.cc b/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler_impl.cc
index a93dca0474ba97202e2b12c32a923b9577e2c5fa..604c101a8525e06b24ae49809f1daefdaf07c794 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler_impl.cc
+++ b/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler_impl.cc
@@ -120,6 +120,16 @@ void WorkerSchedulerImpl::Shutdown() {
   helper_.Shutdown();
 }
 
+scoped_refptr<TaskQueue> WorkerSchedulerImpl::NewUnthrottledTaskRunner(
+    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;
+}
+
 SchedulerHelper* WorkerSchedulerImpl::GetSchedulerHelperForTesting() {
   return &helper_;
 }