| // Copyright 2017 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 "third_party/blink/renderer/platform/scheduler/main_thread/main_thread_metrics_helper.h" |
| |
| #include "base/bind.h" |
| #include "base/metrics/histogram_macros.h" |
| #include "services/resource_coordinator/public/cpp/resource_coordinator_features.h" |
| #include "third_party/blink/public/platform/scheduler/renderer_process_type.h" |
| #include "third_party/blink/renderer/platform/instrumentation/resource_coordinator/renderer_resource_coordinator.h" |
| #include "third_party/blink/renderer/platform/scheduler/main_thread/main_thread_scheduler_impl.h" |
| #include "third_party/blink/renderer/platform/scheduler/public/frame_scheduler.h" |
| |
| namespace blink { |
| namespace scheduler { |
| |
| #define DURATION_PER_QUEUE_TYPE_METRIC_NAME \ |
| "RendererScheduler.TaskDurationPerQueueType2" |
| #define COUNT_PER_QUEUE_TYPE_METRIC_NAME \ |
| "RendererScheduler.TaskCountPerQueueType" |
| #define MAIN_THREAD_LOAD_METRIC_NAME "RendererScheduler.RendererMainThreadLoad5" |
| #define EXTENSIONS_MAIN_THREAD_LOAD_METRIC_NAME \ |
| MAIN_THREAD_LOAD_METRIC_NAME ".Extension" |
| #define DURATION_PER_FRAME_TYPE_METRIC_NAME \ |
| "RendererScheduler.TaskDurationPerFrameType2" |
| #define DURATION_PER_TASK_TYPE_METRIC_NAME \ |
| "RendererScheduler.TaskDurationPerTaskType" |
| #define COUNT_PER_FRAME_METRIC_NAME "RendererScheduler.TaskCountPerFrameType" |
| #define DURATION_PER_TASK_USE_CASE_NAME \ |
| "RendererScheduler.TaskDurationPerUseCase" |
| |
| enum class MainThreadTaskLoadState { kLow, kHigh, kUnknown }; |
| |
| namespace { |
| |
| constexpr base::TimeDelta kThreadLoadTrackerReportingInterval = |
| base::TimeDelta::FromSeconds(1); |
| constexpr base::TimeDelta kLongIdlePeriodDiscardingThreshold = |
| base::TimeDelta::FromMinutes(3); |
| |
| } // namespace |
| |
| MainThreadMetricsHelper::PerQueueTypeDurationReporters:: |
| PerQueueTypeDurationReporters() |
| : overall(DURATION_PER_QUEUE_TYPE_METRIC_NAME), |
| foreground(DURATION_PER_QUEUE_TYPE_METRIC_NAME ".Foreground"), |
| foreground_first_minute(DURATION_PER_QUEUE_TYPE_METRIC_NAME |
| ".Foreground.FirstMinute"), |
| foreground_second_minute(DURATION_PER_QUEUE_TYPE_METRIC_NAME |
| ".Foreground.SecondMinute"), |
| foreground_third_minute(DURATION_PER_QUEUE_TYPE_METRIC_NAME |
| ".Foreground.ThirdMinute"), |
| foreground_after_third_minute(DURATION_PER_QUEUE_TYPE_METRIC_NAME |
| ".Foreground.AfterThirdMinute"), |
| background(DURATION_PER_QUEUE_TYPE_METRIC_NAME ".Background"), |
| background_first_minute(DURATION_PER_QUEUE_TYPE_METRIC_NAME |
| ".Background.FirstMinute"), |
| background_second_minute(DURATION_PER_QUEUE_TYPE_METRIC_NAME |
| ".Background.SecondMinute"), |
| background_third_minute(DURATION_PER_QUEUE_TYPE_METRIC_NAME |
| ".Background.ThirdMinute"), |
| background_fourth_minute(DURATION_PER_QUEUE_TYPE_METRIC_NAME |
| ".Background.FourthMinute"), |
| background_fifth_minute(DURATION_PER_QUEUE_TYPE_METRIC_NAME |
| ".Background.FifthMinute"), |
| background_after_fifth_minute(DURATION_PER_QUEUE_TYPE_METRIC_NAME |
| ".Background.AfterFifthMinute"), |
| background_keep_active_after_fifth_minute( |
| DURATION_PER_QUEUE_TYPE_METRIC_NAME |
| ".Background.KeepAlive.AfterFifthMinute"), |
| hidden(DURATION_PER_QUEUE_TYPE_METRIC_NAME ".Hidden"), |
| visible(DURATION_PER_QUEUE_TYPE_METRIC_NAME ".Visible"), |
| hidden_music(DURATION_PER_QUEUE_TYPE_METRIC_NAME ".HiddenMusic") {} |
| |
| MainThreadMetricsHelper::MainThreadMetricsHelper( |
| MainThreadSchedulerImpl* main_thread_scheduler, |
| base::TimeTicks now, |
| bool renderer_backgrounded) |
| : MetricsHelper(WebThreadType::kMainThread), |
| main_thread_scheduler_(main_thread_scheduler), |
| main_thread_load_tracker_( |
| now, |
| base::BindRepeating( |
| &MainThreadMetricsHelper::RecordMainThreadTaskLoad, |
| base::Unretained(this)), |
| kThreadLoadTrackerReportingInterval), |
| background_main_thread_load_tracker_( |
| now, |
| base::BindRepeating( |
| &MainThreadMetricsHelper::RecordBackgroundMainThreadTaskLoad, |
| base::Unretained(this)), |
| kThreadLoadTrackerReportingInterval), |
| foreground_main_thread_load_tracker_( |
| now, |
| base::BindRepeating( |
| &MainThreadMetricsHelper::RecordForegroundMainThreadTaskLoad, |
| base::Unretained(this)), |
| kThreadLoadTrackerReportingInterval), |
| per_frame_status_duration_reporter_(DURATION_PER_FRAME_TYPE_METRIC_NAME), |
| per_task_type_duration_reporter_(DURATION_PER_TASK_TYPE_METRIC_NAME), |
| no_use_case_per_task_type_duration_reporter_( |
| DURATION_PER_TASK_TYPE_METRIC_NAME ".UseCaseNone"), |
| loading_per_task_type_duration_reporter_( |
| DURATION_PER_TASK_TYPE_METRIC_NAME ".UseCaseLoading"), |
| input_handling_per_task_type_duration_reporter_( |
| DURATION_PER_TASK_TYPE_METRIC_NAME ".UseCaseInputHandling"), |
| foreground_per_task_type_duration_reporter_( |
| DURATION_PER_TASK_TYPE_METRIC_NAME ".Foreground"), |
| background_per_task_type_duration_reporter_( |
| DURATION_PER_TASK_TYPE_METRIC_NAME ".Background"), |
| per_task_use_case_duration_reporter_(DURATION_PER_TASK_USE_CASE_NAME), |
| main_thread_task_load_state_(MainThreadTaskLoadState::kUnknown) { |
| main_thread_load_tracker_.Resume(now); |
| if (renderer_backgrounded) { |
| background_main_thread_load_tracker_.Resume(now); |
| } else { |
| foreground_main_thread_load_tracker_.Resume(now); |
| } |
| } |
| |
| MainThreadMetricsHelper::~MainThreadMetricsHelper() = default; |
| |
| void MainThreadMetricsHelper::OnRendererForegrounded(base::TimeTicks now) { |
| foreground_main_thread_load_tracker_.Resume(now); |
| background_main_thread_load_tracker_.Pause(now); |
| } |
| |
| void MainThreadMetricsHelper::OnRendererBackgrounded(base::TimeTicks now) { |
| foreground_main_thread_load_tracker_.Pause(now); |
| background_main_thread_load_tracker_.Resume(now); |
| } |
| |
| void MainThreadMetricsHelper::OnRendererShutdown(base::TimeTicks now) { |
| foreground_main_thread_load_tracker_.RecordIdle(now); |
| background_main_thread_load_tracker_.RecordIdle(now); |
| main_thread_load_tracker_.RecordIdle(now); |
| } |
| |
| void MainThreadMetricsHelper::ResetForTest(base::TimeTicks now) { |
| main_thread_load_tracker_ = ThreadLoadTracker( |
| now, |
| base::BindRepeating(&MainThreadMetricsHelper::RecordMainThreadTaskLoad, |
| base::Unretained(this)), |
| kThreadLoadTrackerReportingInterval); |
| |
| background_main_thread_load_tracker_ = ThreadLoadTracker( |
| now, |
| base::BindRepeating( |
| &MainThreadMetricsHelper::RecordBackgroundMainThreadTaskLoad, |
| base::Unretained(this)), |
| kThreadLoadTrackerReportingInterval); |
| |
| foreground_main_thread_load_tracker_ = ThreadLoadTracker( |
| now, |
| base::BindRepeating( |
| &MainThreadMetricsHelper::RecordForegroundMainThreadTaskLoad, |
| base::Unretained(this)), |
| kThreadLoadTrackerReportingInterval); |
| } |
| |
| namespace { |
| |
| // Calculates the length of the intersection of two given time intervals. |
| base::TimeDelta DurationOfIntervalOverlap(base::TimeTicks start1, |
| base::TimeTicks end1, |
| base::TimeTicks start2, |
| base::TimeTicks end2) { |
| DCHECK_LE(start1, end1); |
| DCHECK_LE(start2, end2); |
| return std::max(std::min(end1, end2) - std::max(start1, start2), |
| base::TimeDelta()); |
| } |
| |
| } // namespace |
| |
| void MainThreadMetricsHelper::RecordTaskMetrics( |
| MainThreadTaskQueue* queue, |
| const TaskQueue::Task& task, |
| base::TimeTicks start_time, |
| base::TimeTicks end_time, |
| base::Optional<base::TimeDelta> thread_time) { |
| if (ShouldDiscardTask(queue, task, start_time, end_time, thread_time)) |
| return; |
| |
| MetricsHelper::RecordCommonTaskMetrics(queue, task, start_time, end_time, |
| thread_time); |
| |
| MainThreadTaskQueue::QueueType queue_type = |
| queue ? queue->queue_type() : MainThreadTaskQueue::QueueType::kDetached; |
| base::TimeDelta duration = end_time - start_time; |
| |
| // Discard anomalously long idle periods. |
| if (last_reported_task_ && start_time - last_reported_task_.value() > |
| kLongIdlePeriodDiscardingThreshold) { |
| main_thread_load_tracker_.Reset(end_time); |
| foreground_main_thread_load_tracker_.Reset(end_time); |
| background_main_thread_load_tracker_.Reset(end_time); |
| return; |
| } |
| |
| last_reported_task_ = end_time; |
| |
| UMA_HISTOGRAM_CUSTOM_COUNTS("RendererScheduler.TaskTime2", |
| duration.InMicroseconds(), 1, 1000 * 1000, 50); |
| |
| // We want to measure thread time here, but for efficiency reasons |
| // we stick with wall time. |
| main_thread_load_tracker_.RecordTaskTime(start_time, end_time); |
| foreground_main_thread_load_tracker_.RecordTaskTime(start_time, end_time); |
| background_main_thread_load_tracker_.RecordTaskTime(start_time, end_time); |
| |
| UMA_HISTOGRAM_ENUMERATION(COUNT_PER_QUEUE_TYPE_METRIC_NAME, queue_type, |
| MainThreadTaskQueue::QueueType::kCount); |
| |
| if (duration >= base::TimeDelta::FromMilliseconds(16)) { |
| UMA_HISTOGRAM_ENUMERATION( |
| COUNT_PER_QUEUE_TYPE_METRIC_NAME ".LongerThan16ms", queue_type, |
| MainThreadTaskQueue::QueueType::kCount); |
| } |
| |
| if (duration >= base::TimeDelta::FromMilliseconds(50)) { |
| UMA_HISTOGRAM_ENUMERATION( |
| COUNT_PER_QUEUE_TYPE_METRIC_NAME ".LongerThan50ms", queue_type, |
| MainThreadTaskQueue::QueueType::kCount); |
| } |
| |
| if (duration >= base::TimeDelta::FromMilliseconds(100)) { |
| UMA_HISTOGRAM_ENUMERATION( |
| COUNT_PER_QUEUE_TYPE_METRIC_NAME ".LongerThan100ms", queue_type, |
| MainThreadTaskQueue::QueueType::kCount); |
| } |
| |
| if (duration >= base::TimeDelta::FromMilliseconds(150)) { |
| UMA_HISTOGRAM_ENUMERATION( |
| COUNT_PER_QUEUE_TYPE_METRIC_NAME ".LongerThan150ms", queue_type, |
| MainThreadTaskQueue::QueueType::kCount); |
| } |
| |
| if (duration >= base::TimeDelta::FromSeconds(1)) { |
| UMA_HISTOGRAM_ENUMERATION(COUNT_PER_QUEUE_TYPE_METRIC_NAME ".LongerThan1s", |
| queue_type, |
| MainThreadTaskQueue::QueueType::kCount); |
| } |
| |
| per_queue_type_reporters_.overall.RecordTask(queue_type, duration); |
| |
| TaskType task_type = static_cast<TaskType>(task.task_type()); |
| per_task_type_duration_reporter_.RecordTask(task_type, duration); |
| |
| if (main_thread_scheduler_->main_thread_only().renderer_backgrounded) { |
| per_queue_type_reporters_.background.RecordTask(queue_type, duration); |
| |
| // Collect detailed breakdown for first five minutes given that we stop |
| // timers on mobile after five minutes. |
| base::TimeTicks backgrounded_at = |
| main_thread_scheduler_->main_thread_only().background_status_changed_at; |
| |
| per_queue_type_reporters_.background_first_minute.RecordTask( |
| queue_type, DurationOfIntervalOverlap( |
| start_time, end_time, backgrounded_at, |
| backgrounded_at + base::TimeDelta::FromMinutes(1))); |
| |
| per_queue_type_reporters_.background_second_minute.RecordTask( |
| queue_type, DurationOfIntervalOverlap( |
| start_time, end_time, |
| backgrounded_at + base::TimeDelta::FromMinutes(1), |
| backgrounded_at + base::TimeDelta::FromMinutes(2))); |
| |
| per_queue_type_reporters_.background_third_minute.RecordTask( |
| queue_type, DurationOfIntervalOverlap( |
| start_time, end_time, |
| backgrounded_at + base::TimeDelta::FromMinutes(2), |
| backgrounded_at + base::TimeDelta::FromMinutes(3))); |
| |
| per_queue_type_reporters_.background_fourth_minute.RecordTask( |
| queue_type, DurationOfIntervalOverlap( |
| start_time, end_time, |
| backgrounded_at + base::TimeDelta::FromMinutes(3), |
| backgrounded_at + base::TimeDelta::FromMinutes(4))); |
| |
| per_queue_type_reporters_.background_fifth_minute.RecordTask( |
| queue_type, DurationOfIntervalOverlap( |
| start_time, end_time, |
| backgrounded_at + base::TimeDelta::FromMinutes(4), |
| backgrounded_at + base::TimeDelta::FromMinutes(5))); |
| |
| per_queue_type_reporters_.background_after_fifth_minute.RecordTask( |
| queue_type, |
| DurationOfIntervalOverlap( |
| start_time, end_time, |
| backgrounded_at + base::TimeDelta::FromMinutes(5), |
| std::max(backgrounded_at + base::TimeDelta::FromMinutes(5), |
| end_time))); |
| |
| if (main_thread_scheduler_->main_thread_only() |
| .keep_active_fetch_or_worker) { |
| per_queue_type_reporters_.background_keep_active_after_fifth_minute |
| .RecordTask( |
| queue_type, |
| DurationOfIntervalOverlap( |
| start_time, end_time, |
| backgrounded_at + base::TimeDelta::FromMinutes(5), |
| std::max(backgrounded_at + base::TimeDelta::FromMinutes(5), |
| end_time))); |
| } |
| |
| background_per_task_type_duration_reporter_.RecordTask(task_type, duration); |
| } else { |
| per_queue_type_reporters_.foreground.RecordTask(queue_type, duration); |
| |
| // For foreground tabs we do not expect such a notable difference as it is |
| // the case with background tabs, so we limit breakdown to three minutes. |
| base::TimeTicks foregrounded_at = |
| main_thread_scheduler_->main_thread_only().background_status_changed_at; |
| |
| per_queue_type_reporters_.foreground_first_minute.RecordTask( |
| queue_type, DurationOfIntervalOverlap( |
| start_time, end_time, foregrounded_at, |
| foregrounded_at + base::TimeDelta::FromMinutes(1))); |
| |
| per_queue_type_reporters_.foreground_second_minute.RecordTask( |
| queue_type, DurationOfIntervalOverlap( |
| start_time, end_time, |
| foregrounded_at + base::TimeDelta::FromMinutes(1), |
| foregrounded_at + base::TimeDelta::FromMinutes(2))); |
| |
| per_queue_type_reporters_.foreground_third_minute.RecordTask( |
| queue_type, DurationOfIntervalOverlap( |
| start_time, end_time, |
| foregrounded_at + base::TimeDelta::FromMinutes(2), |
| foregrounded_at + base::TimeDelta::FromMinutes(3))); |
| |
| per_queue_type_reporters_.foreground_after_third_minute.RecordTask( |
| queue_type, |
| DurationOfIntervalOverlap( |
| start_time, end_time, |
| foregrounded_at + base::TimeDelta::FromMinutes(3), |
| std::max(foregrounded_at + base::TimeDelta::FromMinutes(3), |
| end_time))); |
| |
| foreground_per_task_type_duration_reporter_.RecordTask(task_type, duration); |
| } |
| |
| if (main_thread_scheduler_->main_thread_only().renderer_hidden) { |
| per_queue_type_reporters_.hidden.RecordTask(queue_type, duration); |
| |
| if (main_thread_scheduler_->IsAudioPlaying()) { |
| per_queue_type_reporters_.hidden_music.RecordTask(queue_type, duration); |
| } |
| } else { |
| per_queue_type_reporters_.visible.RecordTask(queue_type, duration); |
| } |
| |
| FrameStatus frame_status = |
| GetFrameStatus(queue ? queue->GetFrameScheduler() : nullptr); |
| per_frame_status_duration_reporter_.RecordTask(frame_status, duration); |
| UMA_HISTOGRAM_ENUMERATION(COUNT_PER_FRAME_METRIC_NAME, frame_status, |
| FrameStatus::kCount); |
| if (duration >= base::TimeDelta::FromMilliseconds(16)) { |
| UMA_HISTOGRAM_ENUMERATION(COUNT_PER_FRAME_METRIC_NAME ".LongerThan16ms", |
| frame_status, FrameStatus::kCount); |
| } |
| |
| if (duration >= base::TimeDelta::FromMilliseconds(50)) { |
| UMA_HISTOGRAM_ENUMERATION(COUNT_PER_FRAME_METRIC_NAME ".LongerThan50ms", |
| frame_status, FrameStatus::kCount); |
| } |
| |
| if (duration >= base::TimeDelta::FromMilliseconds(100)) { |
| UMA_HISTOGRAM_ENUMERATION(COUNT_PER_FRAME_METRIC_NAME ".LongerThan100ms", |
| frame_status, FrameStatus::kCount); |
| } |
| |
| if (duration >= base::TimeDelta::FromMilliseconds(150)) { |
| UMA_HISTOGRAM_ENUMERATION(COUNT_PER_FRAME_METRIC_NAME ".LongerThan150ms", |
| frame_status, FrameStatus::kCount); |
| } |
| |
| if (duration >= base::TimeDelta::FromSeconds(1)) { |
| UMA_HISTOGRAM_ENUMERATION(COUNT_PER_FRAME_METRIC_NAME ".LongerThan1s", |
| frame_status, FrameStatus::kCount); |
| } |
| |
| UseCase use_case = |
| main_thread_scheduler_->main_thread_only().current_use_case; |
| per_task_use_case_duration_reporter_.RecordTask(use_case, duration); |
| if (use_case == UseCase::kNone) { |
| no_use_case_per_task_type_duration_reporter_.RecordTask(task_type, |
| duration); |
| } else if (use_case == UseCase::kLoading) { |
| loading_per_task_type_duration_reporter_.RecordTask(task_type, duration); |
| } else { |
| input_handling_per_task_type_duration_reporter_.RecordTask(task_type, |
| duration); |
| } |
| } |
| |
| void MainThreadMetricsHelper::RecordMainThreadTaskLoad(base::TimeTicks time, |
| double load) { |
| int load_percentage = static_cast<int>(load * 100); |
| DCHECK_LE(load_percentage, 100); |
| |
| if (::resource_coordinator::IsPageAlmostIdleSignalEnabled()) { |
| static const int main_thread_task_load_low_threshold = |
| ::resource_coordinator::GetMainThreadTaskLoadLowThreshold(); |
| |
| // Avoid sending duplicate IPCs when the state doesn't change. |
| if (load_percentage <= main_thread_task_load_low_threshold && |
| main_thread_task_load_state_ != MainThreadTaskLoadState::kLow) { |
| RendererResourceCoordinator::Get().SetMainThreadTaskLoadIsLow(true); |
| main_thread_task_load_state_ = MainThreadTaskLoadState::kLow; |
| } else if (load_percentage > main_thread_task_load_low_threshold && |
| main_thread_task_load_state_ != MainThreadTaskLoadState::kHigh) { |
| RendererResourceCoordinator::Get().SetMainThreadTaskLoadIsLow(false); |
| main_thread_task_load_state_ = MainThreadTaskLoadState::kHigh; |
| } |
| } |
| |
| UMA_HISTOGRAM_PERCENTAGE(MAIN_THREAD_LOAD_METRIC_NAME, load_percentage); |
| |
| if (main_thread_scheduler_->main_thread_only().process_type == |
| RendererProcessType::kExtensionRenderer) { |
| UMA_HISTOGRAM_PERCENTAGE(EXTENSIONS_MAIN_THREAD_LOAD_METRIC_NAME, |
| load_percentage); |
| } |
| |
| TRACE_COUNTER1(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadScheduler.RendererMainThreadLoad", load_percentage); |
| } |
| |
| void MainThreadMetricsHelper::RecordForegroundMainThreadTaskLoad( |
| base::TimeTicks time, |
| double load) { |
| int load_percentage = static_cast<int>(load * 100); |
| DCHECK_LE(load_percentage, 100); |
| |
| switch (main_thread_scheduler_->main_thread_only().process_type) { |
| case RendererProcessType::kExtensionRenderer: |
| UMA_HISTOGRAM_PERCENTAGE(EXTENSIONS_MAIN_THREAD_LOAD_METRIC_NAME |
| ".Foreground", |
| load_percentage); |
| break; |
| case RendererProcessType::kRenderer: |
| UMA_HISTOGRAM_PERCENTAGE(MAIN_THREAD_LOAD_METRIC_NAME ".Foreground", |
| load_percentage); |
| |
| if (time - main_thread_scheduler_->main_thread_only() |
| .background_status_changed_at > |
| base::TimeDelta::FromMinutes(1)) { |
| UMA_HISTOGRAM_PERCENTAGE(MAIN_THREAD_LOAD_METRIC_NAME |
| ".Foreground.AfterFirstMinute", |
| load_percentage); |
| } |
| break; |
| } |
| |
| TRACE_COUNTER1(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadScheduler.RendererMainThreadLoad.Foreground", |
| load_percentage); |
| } |
| |
| void MainThreadMetricsHelper::RecordBackgroundMainThreadTaskLoad( |
| base::TimeTicks time, |
| double load) { |
| int load_percentage = static_cast<int>(load * 100); |
| DCHECK_LE(load_percentage, 100); |
| |
| switch (main_thread_scheduler_->main_thread_only().process_type) { |
| case RendererProcessType::kExtensionRenderer: |
| UMA_HISTOGRAM_PERCENTAGE(EXTENSIONS_MAIN_THREAD_LOAD_METRIC_NAME |
| ".Background", |
| load_percentage); |
| break; |
| case RendererProcessType::kRenderer: |
| UMA_HISTOGRAM_PERCENTAGE(MAIN_THREAD_LOAD_METRIC_NAME ".Background", |
| load_percentage); |
| |
| if (time - main_thread_scheduler_->main_thread_only() |
| .background_status_changed_at > |
| base::TimeDelta::FromMinutes(1)) { |
| UMA_HISTOGRAM_PERCENTAGE(MAIN_THREAD_LOAD_METRIC_NAME |
| ".Background.AfterFirstMinute", |
| load_percentage); |
| } |
| break; |
| } |
| |
| TRACE_COUNTER1(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadScheduler.RendererMainThreadLoad.Background", |
| load_percentage); |
| } |
| |
| // static |
| void MainThreadMetricsHelper::RecordBackgroundedTransition( |
| BackgroundedRendererTransition transition) { |
| UMA_HISTOGRAM_ENUMERATION("RendererScheduler.BackgroundedRendererTransition", |
| transition, BackgroundedRendererTransition::kCount); |
| } |
| } // namespace scheduler |
| } // namespace blink |
