Worker: Introduce per-global-scope task scheduler

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

Index: third_party/WebKit/Source/platform/scheduler/child/worker_scheduler.h
diff --git a/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler.h b/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler.h
index 5fc53ec067042b450e4ca95a8970bd522282d78c..8e3e4428f2df4902a0648405a3d577d32ec161f9 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler.h
+++ b/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler.h
@@ -10,6 +10,7 @@
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "public/platform/WebCommon.h"
+#include "public/platform/scheduler/base/task_queue.h"
 #include "public/platform/scheduler/child/child_scheduler.h"
 #include "public/platform/scheduler/child/single_thread_idle_task_runner.h"
 
@@ -27,6 +28,9 @@ class BLINK_PLATFORM_EXPORT WorkerScheduler : public ChildScheduler {
   // initialization needed such as initializing idle period detection.
   virtual void Init() = 0;
 
+  virtual scoped_refptr<TaskQueue> NewUnthrottledTaskRunner(
+      TaskQueue::QueueType queue_type) = 0;
+
  protected:
   WorkerScheduler();
   DISALLOW_COPY_AND_ASSIGN(WorkerScheduler);