Record accuracy of expected queueing time metric.

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/scheduler/renderer/renderer_scheduler_impl.h"
 
 #include "base/bind.h"
 #include "base/debug/stack_trace.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 833 matching lines @@
     // detected.
     if (GetAnyThread().awaiting_touch_start_response &&
         result == WebInputEventResult::kHandledApplication) {
       GetAnyThread().awaiting_touch_start_response = false;
       GetAnyThread().default_gesture_prevented = true;
       UpdatePolicyLocked(UpdateType::MAY_EARLY_OUT_IF_POLICY_UNCHANGED);
     }
   }
 }
 
+base::TimeDelta RendererSchedulerImpl::MostRecentExpectedQueueingTime() {
+  return GetMainThreadOnly().most_recent_expected_queueing_time;
+}
+
 bool RendererSchedulerImpl::IsHighPriorityWorkAnticipated() {
   helper_.CheckOnValidThread();
   if (helper_.IsShutdown())
     return false;
 
   MaybeUpdatePolicy();
   // The touchstart, synchronized gesture and main-thread gesture use cases
   // indicate a strong likelihood of high-priority work in the near future.
   UseCase use_case = GetMainThreadOnly().current_use_case;
   return GetMainThreadOnly().touchstart_expected_soon ||
@@ skipping 1159 matching lines @@
 }
 
 void RendererSchedulerImpl::RemoveTaskTimeObserver(
     TaskTimeObserver* task_time_observer) {
   helper_.RemoveTaskTimeObserver(task_time_observer);
 }
 
 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) {
         GetMainThreadOnly().max_queueing_time_metric =
             CreateMaxQueueingTimeMetric();
       }
       GetMainThreadOnly().max_queueing_time_metric->SetSample(
           queueing_time.InMilliseconds());
       GetMainThreadOnly().max_queueing_time = queueing_time;
     }
@@ skipping 149 matching lines @@
     case TimeDomainType::VIRTUAL:
       return "virtual";
     default:
       NOTREACHED();
       return nullptr;
   }
 }
 
 }  // namespace scheduler
 }  // namespace blink