Report the duration of sampled tasks with histogram.

components/scheduler/renderer/renderer_scheduler_impl.cc

Index: components/scheduler/renderer/renderer_scheduler_impl.cc
diff --git a/components/scheduler/renderer/renderer_scheduler_impl.cc b/components/scheduler/renderer/renderer_scheduler_impl.cc
index 00a0426706bab6c32a24201a7c7061c3c84bf0a9..02ed6404b3c3f28397f74064105c124007c11288 100644
--- a/components/scheduler/renderer/renderer_scheduler_impl.cc
+++ b/components/scheduler/renderer/renderer_scheduler_impl.cc
@@ -1394,6 +1394,9 @@ void RendererSchedulerImpl::ReportTaskTime(base::TimeTicks start_time,
                                                                    end_time);
   MainThreadOnly().long_task_tracker.RecordLongTask(
       start_time, end_time - start_time);
+  UMA_HISTOGRAM_CUSTOM_COUNTS("RendererScheduler.TaskTime",
+                              (end_time - start_time).InMicroseconds(), 1,
+                              1000000, 50);
 }
 
 LongTaskTracker::LongTaskTiming RendererSchedulerImpl::GetLongTaskTiming() {