[Try # 3] Scheduler refactoring to virtually eliminate redundant DoWorks

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

Index: third_party/WebKit/Source/platform/scheduler/child/scheduler_helper.h
diff --git a/third_party/WebKit/Source/platform/scheduler/child/scheduler_helper.h b/third_party/WebKit/Source/platform/scheduler/child/scheduler_helper.h
index 3a62d523cb115f7e3525062b30452e51e1838c52..4659927f81d32d03ed3ac13d715f45d17bfd8d99 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/scheduler_helper.h
+++ b/third_party/WebKit/Source/platform/scheduler/child/scheduler_helper.h
@@ -28,8 +28,18 @@ class BLINK_PLATFORM_EXPORT SchedulerHelper
       const char* tracing_category,
       const char* disabled_by_default_tracing_category,
       const char* disabled_by_default_verbose_tracing_category);
+  SchedulerHelper(
+      scoped_refptr<SchedulerTqmDelegate> task_queue_manager_delegate,
+      const char* tracing_category,
+      const char* disabled_by_default_tracing_category,
+      const char* disabled_by_default_verbose_tracing_category,
+      TaskQueue::Spec default_task_queue_spec);
   ~SchedulerHelper() override;
 
+  // There is a small overhead to recording task delay histograms, we may not
+  // wish to do this on all threads.
+  void SetRecordTaskDelayHistograms(bool record_task_delay_histograms);
+
   // TaskQueueManager::Observer implementation:
   void OnUnregisterTaskQueue(const scoped_refptr<TaskQueue>& queue) override;
   void OnTriedToExecuteBlockedTask(const TaskQueue& queue,