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 0ce5d151ecd893249c2ab48160e583439abf783f..b739f1b24a0a9ce5147b51c2cb18672c8e9b5c20 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
@@ -92,6 +92,17 @@ void WorkerSchedulerImpl::Shutdown() {
   helper_.Shutdown();
 }
 
+scoped_refptr<TaskQueue> WorkerSchedulerImpl::NewUnthrottledTaskRunner(
+    TaskQueue::QueueType queue_type) {
+  helper_.CheckOnValidThread();
+  // TODO: TimeDomain??

[Sami, 2017/04/10 16:58:10]

A real time time domain (i.e., nullptr) is fine for now. We'll probably look at
supporting virtual time on worker threads at some point.

[nhiroki, 2017/04/11 10:47:54]

Thank you for the information. Removed this comment.

+  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_;
 }