Record accuracy of expected queueing time metric.

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

Index: third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc
index 542a75f0f51009d909010fb0839e825128e84e05..e04898bb1e7eb996d655c70d83dfac7a17b60861 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc
@@ -851,6 +851,10 @@ void RendererSchedulerImpl::DidHandleInputEventOnMainThread(
   }
 }
 
+base::TimeDelta RendererSchedulerImpl::MostRecentExpectedQueueingTime() {
+  return GetMainThreadOnly().most_recent_expected_queueing_time;
+}
+
 bool RendererSchedulerImpl::IsHighPriorityWorkAnticipated() {
   helper_.CheckOnValidThread();
   if (helper_.IsShutdown())
@@ -2030,6 +2034,8 @@ void RendererSchedulerImpl::RemoveTaskTimeObserver(
 void RendererSchedulerImpl::OnQueueingTimeForWindowEstimated(
     base::TimeDelta queueing_time,
     base::TimeTicks window_start_time) {
+  GetMainThreadOnly().most_recent_expected_queueing_time = queueing_time;
+
   if (GetMainThreadOnly().has_navigated) {
     if (GetMainThreadOnly().max_queueing_time < queueing_time) {
       if (!GetMainThreadOnly().max_queueing_time_metric) {