Add an api to disable recording task delay histogrames

third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h

Index: third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
index 37c331fbe8eb9427cc835f50f392b5631d4d110b..6b4305ea49243ada10b507e7e5e4814f9983a4b9 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
@@ -143,6 +143,10 @@ class BLINK_PLATFORM_EXPORT TaskQueueManager
   // Removes all canceled delayed tasks.
   void SweepCanceledDelayedTasks();
 
+  // There is a small overhead to recording task delay histograms. If you don't
+  // need them, you can turn them off.
+  void SetRecordTaskDelayHistograms(bool record_task_delay_histograms);
+
  private:
   friend class LazyNow;
   friend class internal::TaskQueueImpl;
@@ -246,6 +250,8 @@ class BLINK_PLATFORM_EXPORT TaskQueueManager
   mutable base::Lock other_thread_lock_;
   bool other_thread_pending_wakeup_;
 
+  bool record_task_delay_histograms_;
+
   int work_batch_size_;
   size_t task_count_;