[scheduler] Add RendererScheduler.TaskDurationPerQueueType.

third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h

Index: third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
index 45652f391d9f0515cf71ff75eebc4ff93fdfad89..8f9a50731032392fc58ad940301048828de9fc3b 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
@@ -379,6 +379,9 @@ class BLINK_PLATFORM_EXPORT RendererSchedulerImpl
 
   bool ShouldDisableThrottlingBecauseOfAudio(base::TimeTicks now);
 
+  void RecordTaskMetrics(TaskQueue::QueueType queue_type,
+                         base::TimeDelta duration);
+
   SchedulerHelper helper_;
   IdleHelper idle_helper_;
   IdleCanceledDelayedTaskSweeper idle_canceled_delayed_task_sweeper_;
@@ -458,6 +461,9 @@ class BLINK_PLATFORM_EXPORT RendererSchedulerImpl
     bool is_audio_playing;
     std::set<WebViewSchedulerImpl*> web_view_schedulers;  // Not owned.
     RAILModeObserver* rail_mode_observer;                 // Not owned.
+    std::array<base::TimeDelta,
+               static_cast<size_t>(TaskQueue::QueueType::COUNT)>
+        task_duration_per_queue_type;
   };
 
   struct AnyThread {