Worker: Introduce per-global-scope task scheduler

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

Index: third_party/WebKit/Source/platform/scheduler/child/global_scope_scheduler.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/child/global_scope_scheduler.cc b/third_party/WebKit/Source/platform/scheduler/child/global_scope_scheduler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1874e6761d79bbafcbffd6335d93ede175d3709c
--- /dev/null
+++ b/third_party/WebKit/Source/platform/scheduler/child/global_scope_scheduler.cc
@@ -0,0 +1,27 @@
+// Copyright 2017 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 "platform/scheduler/child/global_scope_scheduler.h"
+
+#include "public/platform/scheduler/child/worker_scheduler.h"
+
+namespace blink {
+namespace scheduler {
+
+GlobalScopeScheduler::GlobalScopeScheduler(WorkerScheduler* worker_scheduler)
+    : worker_scheduler_(worker_scheduler) {
+  unthrottled_task_queue_ = worker_scheduler_->NewUnthrottledTaskRunner(
+      TaskQueue::QueueType::UNTHROTTLED);
+  unthrottled_task_runner_ = WebTaskRunnerImpl::create(unthrottled_task_queue_);
+}
+
+GlobalScopeScheduler::~GlobalScopeScheduler() = default;
+
+void GlobalScopeScheduler::dispose() {
+  if (unthrottled_task_queue_)
+    unthrottled_task_queue_->UnregisterTaskQueue();
+}
+
+}  // namespace scheduler
+}  // namespace blink