Record accuracy of expected queueing time metric.

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

 // 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.
 
 #ifndef THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_
 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_
 
 #include "base/atomicops.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
@@ skipping 83 matching lines @@
       override;
   void WillBeginFrame(const cc::BeginFrameArgs& args) override;
   void BeginFrameNotExpectedSoon() override;
   void BeginMainFrameNotExpectedUntil(base::TimeTicks time) override;
   void DidCommitFrameToCompositor() override;
   void DidHandleInputEventOnCompositorThread(
       const WebInputEvent& web_input_event,
       InputEventState event_state) override;
   void DidHandleInputEventOnMainThread(const WebInputEvent& web_input_event,
                                        WebInputEventResult result) override;
+  base::TimeDelta MostRecentExpectedQueueingTime() override;
   void DidAnimateForInputOnCompositorThread() override;
   void SetRendererHidden(bool hidden) override;
   void SetRendererBackgrounded(bool backgrounded) override;
   void SuspendRenderer() override;
   void ResumeRenderer() override;
   void AddPendingNavigation(NavigatingFrameType type) override;
   void RemovePendingNavigation(NavigatingFrameType type) override;
   void OnNavigate() override;
   bool IsHighPriorityWorkAnticipated() override;
   bool ShouldYieldForHighPriorityWork() override;
@@ skipping 362 matching lines @@
     TaskCostEstimator timer_task_cost_estimator;
     IdleTimeEstimator idle_time_estimator;
     ThreadLoadTracker background_main_thread_load_tracker;
     ThreadLoadTracker foreground_main_thread_load_tracker;
     UseCase current_use_case;
     Policy current_policy;
     base::TimeTicks current_policy_expiration_time;
     base::TimeTicks estimated_next_frame_begin;
     base::TimeTicks current_task_start_time;
     base::TimeTicks uma_last_queueing_time_report_window_start_time;
+    base::TimeDelta most_recent_expected_queueing_time;
     base::TimeDelta compositor_frame_interval;
     base::TimeDelta longest_jank_free_task_duration;
     base::Optional<base::TimeTicks> last_audio_state_change;
     int timer_queue_suspend_count;  // TIMER_TASK_QUEUE suspended if non-zero.
     int navigation_task_expected_count;
     ExpensiveTaskPolicy expensive_task_policy;
     bool renderer_hidden;
     bool renderer_backgrounded;
     bool renderer_suspended;
     bool timer_queue_suspension_when_backgrounded_enabled;
@@ skipping 100 matching lines @@
 
   base::WeakPtrFactory<RendererSchedulerImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererSchedulerImpl);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_