Add an api to disable recording task delay histogrames

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

Index: third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
index b2572ae4a5f682b39538e36dcc4ff0e14f989020..73b3dec54e258e510b184d4bb03cd122a21045d2 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
@@ -59,6 +59,7 @@ TaskQueueManager::TaskQueueManager(
       delegate_(delegate),
       task_was_run_on_quiescence_monitored_queue_(false),
       other_thread_pending_wakeup_(false),
+      record_task_delay_histograms_(true),
       work_batch_size_(1),
       task_count_(0),
       tracing_category_(tracing_category),
@@ -347,7 +348,8 @@ TaskQueueManager::ProcessTaskResult TaskQueueManager::ProcessTaskFromWorkQueue(
     return ProcessTaskResult::DEFERRED;
   }
 
-  MaybeRecordTaskDelayHistograms(pending_task, queue);
+  if (record_task_delay_histograms_)
+    MaybeRecordTaskDelayHistograms(pending_task, queue);
 
   double task_start_time = 0;
   TRACE_TASK_EXECUTION("TaskQueueManager::ProcessTaskFromWorkQueue",
@@ -523,6 +525,12 @@ bool TaskQueueManager::HasImmediateWorkForTesting() const {
   return !selector_.EnabledWorkQueuesEmpty();
 }
 
+void TaskQueueManager::SetRecordTaskDelayHistograms(
+    bool record_task_delay_histograms) {
+  DCHECK(main_thread_checker_.CalledOnValidThread());
+  record_task_delay_histograms_ = record_task_delay_histograms;
+}
+
 void TaskQueueManager::SweepCanceledDelayedTasks() {
   std::map<TimeDomain*, base::TimeTicks> time_domain_now;
   for (const scoped_refptr<internal::TaskQueueImpl>& queue : queues_) {