| // Copyright 2015 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/main_thread/frame_scheduler_impl.h" |
| |
| #include <memory> |
| #include "base/metrics/histogram_macros.h" |
| #include "base/trace_event/blame_context.h" |
| #include "platform/runtime_enabled_features.h" |
| #include "platform/scheduler/base/real_time_domain.h" |
| #include "platform/scheduler/base/virtual_time_domain.h" |
| #include "platform/scheduler/child/default_params.h" |
| #include "platform/scheduler/child/page_visibility_state.h" |
| #include "platform/scheduler/child/task_runner_impl.h" |
| #include "platform/scheduler/child/worker_scheduler_proxy.h" |
| #include "platform/scheduler/common/throttling/budget_pool.h" |
| #include "platform/scheduler/main_thread/page_scheduler_impl.h" |
| #include "platform/scheduler/renderer/auto_advancing_virtual_time_domain.h" |
| #include "platform/scheduler/renderer/renderer_scheduler_impl.h" |
| #include "platform/scheduler/util/tracing_helper.h" |
| #include "public/platform/BlameContext.h" |
| #include "public/platform/WebString.h" |
| |
| namespace blink { |
| namespace scheduler { |
| |
| namespace { |
| |
| const char* VisibilityStateToString(bool is_visible) { |
| if (is_visible) { |
| return "visible"; |
| } else { |
| return "hidden"; |
| } |
| } |
| |
| const char* PausedStateToString(bool is_paused) { |
| if (is_paused) { |
| return "paused"; |
| } else { |
| return "running"; |
| } |
| } |
| |
| const char* FrozenStateToString(bool is_frozen) { |
| if (is_frozen) { |
| return "frozen"; |
| } else { |
| return "running"; |
| } |
| } |
| |
| } // namespace |
| |
| FrameSchedulerImpl::ActiveConnectionHandleImpl::ActiveConnectionHandleImpl( |
| FrameSchedulerImpl* frame_scheduler) |
| : frame_scheduler_(frame_scheduler->GetWeakPtr()) { |
| frame_scheduler->DidOpenActiveConnection(); |
| } |
| |
| FrameSchedulerImpl::ActiveConnectionHandleImpl::~ActiveConnectionHandleImpl() { |
| if (frame_scheduler_) |
| frame_scheduler_->DidCloseActiveConnection(); |
| } |
| |
| FrameSchedulerImpl::ThrottlingObserverHandleImpl::ThrottlingObserverHandleImpl( |
| FrameSchedulerImpl* frame_scheduler, |
| Observer* observer) |
| : frame_scheduler_(frame_scheduler->GetWeakPtr()), observer_(observer) {} |
| |
| FrameSchedulerImpl::ThrottlingObserverHandleImpl:: |
| ~ThrottlingObserverHandleImpl() { |
| if (frame_scheduler_) |
| frame_scheduler_->RemoveThrottlingObserver(observer_); |
| } |
| |
| FrameSchedulerImpl::FrameSchedulerImpl( |
| RendererSchedulerImpl* renderer_scheduler, |
| PageSchedulerImpl* parent_page_scheduler, |
| base::trace_event::BlameContext* blame_context, |
| FrameScheduler::FrameType frame_type) |
| : frame_type_(frame_type), |
| renderer_scheduler_(renderer_scheduler), |
| parent_page_scheduler_(parent_page_scheduler), |
| blame_context_(blame_context), |
| throttling_state_(FrameScheduler::ThrottlingState::kNotThrottled), |
| frame_visible_(true, |
| "FrameScheduler.FrameVisible", |
| this, |
| &tracing_controller_, |
| VisibilityStateToString), |
| page_visibility_(kDefaultPageVisibility, |
| "FrameScheduler.PageVisibility", |
| this, |
| &tracing_controller_, |
| PageVisibilityStateToString), |
| page_frozen_(false, |
| "FrameScheduler.PageFrozen", |
| this, |
| &tracing_controller_, |
| FrozenStateToString), |
| frame_paused_(false, |
| "FrameScheduler.FramePaused", |
| this, |
| &tracing_controller_, |
| PausedStateToString), |
| frame_origin_type_(frame_type == FrameType::kMainFrame |
| ? FrameOriginType::kMainFrame |
| : FrameOriginType::kSameOriginFrame, |
| "FrameScheduler.Origin", |
| this, |
| &tracing_controller_, |
| FrameOriginTypeToString), |
| url_tracer_("FrameScheduler.URL", this), |
| task_queue_throttled_(false, |
| "FrameScheduler.TaskQueueThrottled", |
| this, |
| &tracing_controller_, |
| YesNoStateToString), |
| active_connection_count_(0), |
| has_active_connection_(false, |
| "FrameScheduler.HasActiveConnection", |
| this, |
| &tracing_controller_, |
| YesNoStateToString), |
| weak_factory_(this) { |
| DCHECK_EQ(throttling_state_, CalculateThrottlingState()); |
| } |
| |
| namespace { |
| |
| void CleanUpQueue(MainThreadTaskQueue* queue) { |
| if (!queue) |
| return; |
| queue->DetachFromRendererScheduler(); |
| queue->SetFrameScheduler(nullptr); |
| queue->SetBlameContext(nullptr); |
| queue->SetQueuePriority(TaskQueue::QueuePriority::kLowPriority); |
| } |
| |
| } // namespace |
| |
| FrameSchedulerImpl::~FrameSchedulerImpl() { |
| weak_factory_.InvalidateWeakPtrs(); |
| |
| RemoveThrottleableQueueFromBackgroundCPUTimeBudgetPool(); |
| |
| CleanUpQueue(loading_task_queue_.get()); |
| CleanUpQueue(loading_control_task_queue_.get()); |
| CleanUpQueue(throttleable_task_queue_.get()); |
| CleanUpQueue(deferrable_task_queue_.get()); |
| CleanUpQueue(pausable_task_queue_.get()); |
| CleanUpQueue(unpausable_task_queue_.get()); |
| |
| if (parent_page_scheduler_) { |
| parent_page_scheduler_->Unregister(this); |
| |
| if (has_active_connection()) |
| parent_page_scheduler_->OnConnectionUpdated(); |
| } |
| } |
| |
| void FrameSchedulerImpl::DetachFromPageScheduler() { |
| RemoveThrottleableQueueFromBackgroundCPUTimeBudgetPool(); |
| |
| parent_page_scheduler_ = nullptr; |
| } |
| |
| void FrameSchedulerImpl:: |
| RemoveThrottleableQueueFromBackgroundCPUTimeBudgetPool() { |
| if (!throttleable_task_queue_) |
| return; |
| |
| if (!parent_page_scheduler_) |
| return; |
| |
| CPUTimeBudgetPool* time_budget_pool = |
| parent_page_scheduler_->BackgroundCPUTimeBudgetPool(); |
| |
| if (!time_budget_pool) |
| return; |
| |
| time_budget_pool->RemoveQueue(renderer_scheduler_->tick_clock()->NowTicks(), |
| throttleable_task_queue_.get()); |
| } |
| |
| std::unique_ptr<FrameScheduler::ThrottlingObserverHandle> |
| FrameSchedulerImpl::AddThrottlingObserver(ObserverType type, |
| Observer* observer) { |
| DCHECK(observer); |
| observer->OnThrottlingStateChanged(CalculateThrottlingState()); |
| loader_observers_.insert(observer); |
| return std::make_unique<ThrottlingObserverHandleImpl>(this, observer); |
| } |
| |
| void FrameSchedulerImpl::RemoveThrottlingObserver(Observer* observer) { |
| DCHECK(observer); |
| const auto found = loader_observers_.find(observer); |
| DCHECK(loader_observers_.end() != found); |
| loader_observers_.erase(found); |
| } |
| |
| void FrameSchedulerImpl::SetFrameVisible(bool frame_visible) { |
| DCHECK(parent_page_scheduler_); |
| if (frame_visible_ == frame_visible) |
| return; |
| UMA_HISTOGRAM_BOOLEAN("RendererScheduler.IPC.FrameVisibility", frame_visible); |
| frame_visible_ = frame_visible; |
| UpdateTaskQueueThrottling(); |
| } |
| |
| bool FrameSchedulerImpl::IsFrameVisible() const { |
| return frame_visible_; |
| } |
| |
| void FrameSchedulerImpl::SetCrossOrigin(bool cross_origin) { |
| DCHECK(parent_page_scheduler_); |
| if (frame_origin_type_ == FrameOriginType::kMainFrame) { |
| DCHECK(!cross_origin); |
| return; |
| } |
| if (cross_origin) { |
| frame_origin_type_ = FrameOriginType::kCrossOriginFrame; |
| } else { |
| frame_origin_type_ = FrameOriginType::kSameOriginFrame; |
| } |
| UpdateTaskQueueThrottling(); |
| } |
| |
| bool FrameSchedulerImpl::IsCrossOrigin() const { |
| return frame_origin_type_ == FrameOriginType::kCrossOriginFrame; |
| } |
| |
| void FrameSchedulerImpl::TraceUrlChange(const String& url) { |
| url_tracer_.TraceString(url); |
| } |
| |
| FrameScheduler::FrameType FrameSchedulerImpl::GetFrameType() const { |
| return frame_type_; |
| } |
| |
| scoped_refptr<base::SingleThreadTaskRunner> FrameSchedulerImpl::GetTaskRunner( |
| TaskType type) { |
| // TODO(haraken): Optimize the mapping from TaskTypes to task runners. |
| switch (type) { |
| case TaskType::kJavascriptTimer: |
| return TaskRunnerImpl::Create(ThrottleableTaskQueue(), type); |
| case TaskType::kUnspecedLoading: |
| case TaskType::kNetworking: |
| return TaskRunnerImpl::Create(LoadingTaskQueue(), type); |
| case TaskType::kNetworkingControl: |
| return TaskRunnerImpl::Create(LoadingControlTaskQueue(), type); |
| // Throttling following tasks may break existing web pages, so tentatively |
| // these are unthrottled. |
| // TODO(nhiroki): Throttle them again after we're convinced that it's safe |
| // or provide a mechanism that web pages can opt-out it if throttling is not |
| // desirable. |
| case TaskType::kDatabaseAccess: |
| case TaskType::kDOMManipulation: |
| case TaskType::kHistoryTraversal: |
| case TaskType::kEmbed: |
| case TaskType::kCanvasBlobSerialization: |
| case TaskType::kRemoteEvent: |
| case TaskType::kWebSocket: |
| case TaskType::kMicrotask: |
| case TaskType::kUnshippedPortMessage: |
| case TaskType::kFileReading: |
| case TaskType::kPresentation: |
| case TaskType::kSensor: |
| case TaskType::kPerformanceTimeline: |
| case TaskType::kWebGL: |
| case TaskType::kIdleTask: |
| case TaskType::kUnspecedTimer: |
| case TaskType::kMiscPlatformAPI: |
| // TODO(altimin): Move appropriate tasks to throttleable task queue. |
| return TaskRunnerImpl::Create(DeferrableTaskQueue(), type); |
| // PostedMessage can be used for navigation, so we shouldn't defer it |
| // when expecting a user gesture. |
| case TaskType::kPostedMessage: |
| // UserInteraction tasks should be run even when expecting a user gesture. |
| case TaskType::kUserInteraction: |
| // Media events should not be deferred to ensure that media playback is |
| // smooth. |
| case TaskType::kMediaElementEvent: |
| case TaskType::kInternalIndexedDB: |
| case TaskType::kInternalMedia: |
| case TaskType::kInternalMediaRealTime: |
| return TaskRunnerImpl::Create(PausableTaskQueue(), type); |
| case TaskType::kUnthrottled: |
| case TaskType::kInternalTest: |
| case TaskType::kInternalWebCrypto: |
| case TaskType::kInternalIPC: |
| return TaskRunnerImpl::Create(UnpausableTaskQueue(), type); |
| case TaskType::kDeprecatedNone: |
| case TaskType::kCount: |
| NOTREACHED(); |
| break; |
| } |
| NOTREACHED(); |
| return nullptr; |
| } |
| |
| scoped_refptr<TaskQueue> FrameSchedulerImpl::LoadingTaskQueue() { |
| DCHECK(parent_page_scheduler_); |
| if (!loading_task_queue_) { |
| // TODO(panicker): Avoid adding this queue in RS task_runners_. |
| loading_task_queue_ = renderer_scheduler_->NewLoadingTaskQueue( |
| MainThreadTaskQueue::QueueType::kFrameLoading); |
| loading_task_queue_->SetBlameContext(blame_context_); |
| loading_task_queue_->SetFrameScheduler(this); |
| loading_queue_enabled_voter_ = |
| loading_task_queue_->CreateQueueEnabledVoter(); |
| loading_queue_enabled_voter_->SetQueueEnabled(!frame_paused_); |
| } |
| return loading_task_queue_; |
| } |
| |
| scoped_refptr<TaskQueue> FrameSchedulerImpl::LoadingControlTaskQueue() { |
| DCHECK(parent_page_scheduler_); |
| if (!loading_control_task_queue_) { |
| loading_control_task_queue_ = renderer_scheduler_->NewLoadingTaskQueue( |
| MainThreadTaskQueue::QueueType::kFrameLoadingControl); |
| loading_control_task_queue_->SetBlameContext(blame_context_); |
| loading_control_task_queue_->SetFrameScheduler(this); |
| loading_control_queue_enabled_voter_ = |
| loading_control_task_queue_->CreateQueueEnabledVoter(); |
| loading_control_queue_enabled_voter_->SetQueueEnabled(!frame_paused_); |
| } |
| return loading_control_task_queue_; |
| } |
| |
| scoped_refptr<TaskQueue> FrameSchedulerImpl::ThrottleableTaskQueue() { |
| DCHECK(parent_page_scheduler_); |
| if (!throttleable_task_queue_) { |
| // TODO(panicker): Avoid adding this queue in RS task_runners_. |
| throttleable_task_queue_ = renderer_scheduler_->NewTaskQueue( |
| MainThreadTaskQueue::QueueCreationParams( |
| MainThreadTaskQueue::QueueType::kFrameThrottleable) |
| .SetCanBeThrottled(true) |
| .SetCanBeStopped(true) |
| .SetCanBeDeferred(true) |
| .SetCanBePaused(true)); |
| throttleable_task_queue_->SetBlameContext(blame_context_); |
| throttleable_task_queue_->SetFrameScheduler(this); |
| throttleable_queue_enabled_voter_ = |
| throttleable_task_queue_->CreateQueueEnabledVoter(); |
| throttleable_queue_enabled_voter_->SetQueueEnabled(!frame_paused_); |
| |
| CPUTimeBudgetPool* time_budget_pool = |
| parent_page_scheduler_->BackgroundCPUTimeBudgetPool(); |
| if (time_budget_pool) { |
| time_budget_pool->AddQueue(renderer_scheduler_->tick_clock()->NowTicks(), |
| throttleable_task_queue_.get()); |
| } |
| UpdateTaskQueueThrottling(); |
| } |
| return throttleable_task_queue_; |
| } |
| |
| scoped_refptr<TaskQueue> FrameSchedulerImpl::DeferrableTaskQueue() { |
| DCHECK(parent_page_scheduler_); |
| if (!deferrable_task_queue_) { |
| deferrable_task_queue_ = renderer_scheduler_->NewTaskQueue( |
| MainThreadTaskQueue::QueueCreationParams( |
| MainThreadTaskQueue::QueueType::kFrameDeferrable) |
| .SetCanBeDeferred(true) |
| .SetCanBeStopped( |
| RuntimeEnabledFeatures::StopNonTimersInBackgroundEnabled()) |
| .SetCanBePaused(true)); |
| deferrable_task_queue_->SetBlameContext(blame_context_); |
| deferrable_task_queue_->SetFrameScheduler(this); |
| deferrable_queue_enabled_voter_ = |
| deferrable_task_queue_->CreateQueueEnabledVoter(); |
| deferrable_queue_enabled_voter_->SetQueueEnabled(!frame_paused_); |
| } |
| return deferrable_task_queue_; |
| } |
| |
| scoped_refptr<TaskQueue> FrameSchedulerImpl::PausableTaskQueue() { |
| DCHECK(parent_page_scheduler_); |
| if (!pausable_task_queue_) { |
| pausable_task_queue_ = renderer_scheduler_->NewTaskQueue( |
| MainThreadTaskQueue::QueueCreationParams( |
| MainThreadTaskQueue::QueueType::kFramePausable) |
| .SetCanBeStopped( |
| RuntimeEnabledFeatures::StopNonTimersInBackgroundEnabled()) |
| .SetCanBePaused(true)); |
| pausable_task_queue_->SetBlameContext(blame_context_); |
| pausable_task_queue_->SetFrameScheduler(this); |
| pausable_queue_enabled_voter_ = |
| pausable_task_queue_->CreateQueueEnabledVoter(); |
| pausable_queue_enabled_voter_->SetQueueEnabled(!frame_paused_); |
| } |
| return pausable_task_queue_; |
| } |
| |
| scoped_refptr<TaskQueue> FrameSchedulerImpl::UnpausableTaskQueue() { |
| DCHECK(parent_page_scheduler_); |
| if (!unpausable_task_queue_) { |
| unpausable_task_queue_ = renderer_scheduler_->NewTaskQueue( |
| MainThreadTaskQueue::QueueCreationParams( |
| MainThreadTaskQueue::QueueType::kFrameUnpausable)); |
| unpausable_task_queue_->SetBlameContext(blame_context_); |
| unpausable_task_queue_->SetFrameScheduler(this); |
| } |
| return unpausable_task_queue_; |
| } |
| |
| scoped_refptr<TaskQueue> FrameSchedulerImpl::ControlTaskQueue() { |
| DCHECK(parent_page_scheduler_); |
| return renderer_scheduler_->ControlTaskQueue(); |
| } |
| |
| blink::PageScheduler* FrameSchedulerImpl::GetPageScheduler() const { |
| return parent_page_scheduler_; |
| } |
| |
| void FrameSchedulerImpl::DidStartProvisionalLoad(bool is_main_frame) { |
| renderer_scheduler_->DidStartProvisionalLoad(is_main_frame); |
| } |
| |
| void FrameSchedulerImpl::DidCommitProvisionalLoad( |
| bool is_web_history_inert_commit, |
| bool is_reload, |
| bool is_main_frame) { |
| renderer_scheduler_->DidCommitProvisionalLoad(is_web_history_inert_commit, |
| is_reload, is_main_frame); |
| } |
| |
| WebScopedVirtualTimePauser FrameSchedulerImpl::CreateWebScopedVirtualTimePauser( |
| WebScopedVirtualTimePauser::VirtualTaskDuration duration) { |
| return WebScopedVirtualTimePauser(renderer_scheduler_, duration); |
| } |
| |
| void FrameSchedulerImpl::DidOpenActiveConnection() { |
| ++active_connection_count_; |
| has_active_connection_ = static_cast<bool>(active_connection_count_); |
| if (parent_page_scheduler_) |
| parent_page_scheduler_->OnConnectionUpdated(); |
| } |
| |
| void FrameSchedulerImpl::DidCloseActiveConnection() { |
| DCHECK_GT(active_connection_count_, 0); |
| --active_connection_count_; |
| has_active_connection_ = static_cast<bool>(active_connection_count_); |
| if (parent_page_scheduler_) |
| parent_page_scheduler_->OnConnectionUpdated(); |
| } |
| |
| void FrameSchedulerImpl::AsValueInto( |
| base::trace_event::TracedValue* state) const { |
| state->SetBoolean("frame_visible", frame_visible_); |
| state->SetBoolean("page_visible", |
| page_visibility_ == PageVisibilityState::kVisible); |
| state->SetBoolean("cross_origin", IsCrossOrigin()); |
| state->SetString("frame_type", |
| frame_type_ == FrameScheduler::FrameType::kMainFrame |
| ? "MainFrame" |
| : "Subframe"); |
| if (loading_task_queue_) { |
| state->SetString("loading_task_queue", |
| PointerToString(loading_task_queue_.get())); |
| } |
| if (loading_control_task_queue_) { |
| state->SetString("loading_control_task_queue", |
| PointerToString(loading_control_task_queue_.get())); |
| } |
| if (throttleable_task_queue_) { |
| state->SetString("throttleable_task_queue", |
| PointerToString(throttleable_task_queue_.get())); |
| } |
| if (deferrable_task_queue_) { |
| state->SetString("deferrable_task_queue", |
| PointerToString(deferrable_task_queue_.get())); |
| } |
| if (pausable_task_queue_) { |
| state->SetString("pausable_task_queue", |
| PointerToString(pausable_task_queue_.get())); |
| } |
| if (unpausable_task_queue_) { |
| state->SetString("unpausable_task_queue", |
| PointerToString(unpausable_task_queue_.get())); |
| } |
| if (blame_context_) { |
| state->BeginDictionary("blame_context"); |
| state->SetString( |
| "id_ref", |
| PointerToString(reinterpret_cast<void*>(blame_context_->id()))); |
| state->SetString("scope", blame_context_->scope()); |
| state->EndDictionary(); |
| } |
| } |
| |
| void FrameSchedulerImpl::SetPageVisibility( |
| PageVisibilityState page_visibility) { |
| DCHECK(parent_page_scheduler_); |
| if (page_visibility_ == page_visibility) |
| return; |
| page_visibility_ = page_visibility; |
| if (page_visibility_ == PageVisibilityState::kVisible) |
| page_frozen_ = false; // visible page must not be frozen. |
| // TODO(altimin): Avoid having to call all these methods here. |
| UpdateTaskQueues(); |
| UpdateTaskQueueThrottling(); |
| UpdateThrottlingState(); |
| } |
| |
| bool FrameSchedulerImpl::IsPageVisible() const { |
| return page_visibility_ == PageVisibilityState::kVisible; |
| } |
| |
| void FrameSchedulerImpl::SetPaused(bool frame_paused) { |
| DCHECK(parent_page_scheduler_); |
| if (frame_paused_ == frame_paused) |
| return; |
| |
| frame_paused_ = frame_paused; |
| UpdateTaskQueues(); |
| } |
| |
| void FrameSchedulerImpl::SetPageFrozen(bool frozen) { |
| if (frozen == page_frozen_) |
| return; |
| DCHECK(page_visibility_ == PageVisibilityState::kHidden); |
| page_frozen_ = frozen; |
| UpdateTaskQueues(); |
| UpdateThrottlingState(); |
| } |
| |
| void FrameSchedulerImpl::UpdateTaskQueues() { |
| // Per-frame (stoppable) task queues will be stopped after 5mins in |
| // background. They will be resumed when the page is visible. |
| UpdateTaskQueue(throttleable_task_queue_, |
| throttleable_queue_enabled_voter_.get()); |
| UpdateTaskQueue(loading_task_queue_, loading_queue_enabled_voter_.get()); |
| UpdateTaskQueue(loading_control_task_queue_, |
| loading_control_queue_enabled_voter_.get()); |
| UpdateTaskQueue(deferrable_task_queue_, |
| deferrable_queue_enabled_voter_.get()); |
| UpdateTaskQueue(pausable_task_queue_, pausable_queue_enabled_voter_.get()); |
| } |
| |
| void FrameSchedulerImpl::UpdateTaskQueue( |
| const scoped_refptr<MainThreadTaskQueue>& queue, |
| TaskQueue::QueueEnabledVoter* voter) { |
| if (!queue || !voter) |
| return; |
| bool queue_paused = frame_paused_ && queue->CanBePaused(); |
| bool queue_frozen = page_frozen_ && queue->CanBeStopped(); |
| voter->SetQueueEnabled(!queue_paused && !queue_frozen); |
| } |
| |
| void FrameSchedulerImpl::UpdateThrottlingState() { |
| FrameScheduler::ThrottlingState throttling_state = CalculateThrottlingState(); |
| if (throttling_state == throttling_state_) |
| return; |
| throttling_state_ = throttling_state; |
| for (auto observer : loader_observers_) |
| observer->OnThrottlingStateChanged(throttling_state_); |
| } |
| |
| FrameScheduler::ThrottlingState FrameSchedulerImpl::CalculateThrottlingState() |
| const { |
| if (RuntimeEnabledFeatures::StopLoadingInBackgroundEnabled() && |
| page_frozen_) { |
| DCHECK(page_visibility_ == PageVisibilityState::kHidden); |
| return FrameScheduler::ThrottlingState::kStopped; |
| } |
| if (page_visibility_ == PageVisibilityState::kHidden) |
| return FrameScheduler::ThrottlingState::kThrottled; |
| return FrameScheduler::ThrottlingState::kNotThrottled; |
| } |
| |
| void FrameSchedulerImpl::OnFirstMeaningfulPaint() { |
| renderer_scheduler_->OnFirstMeaningfulPaint(); |
| } |
| |
| std::unique_ptr<FrameScheduler::ActiveConnectionHandle> |
| FrameSchedulerImpl::OnActiveConnectionCreated() { |
| return std::make_unique<FrameSchedulerImpl::ActiveConnectionHandleImpl>(this); |
| } |
| |
| bool FrameSchedulerImpl::ShouldThrottleTimers() const { |
| if (page_visibility_ == PageVisibilityState::kHidden) |
| return true; |
| return RuntimeEnabledFeatures::TimerThrottlingForHiddenFramesEnabled() && |
| !frame_visible_ && IsCrossOrigin(); |
| } |
| |
| void FrameSchedulerImpl::UpdateTaskQueueThrottling() { |
| // Before we initialize a trottleable task queue, |task_queue_throttled_| |
| // stays false and this function ensures it indicates whether are we holding |
| // a queue reference for throttler or not. |
| // Don't modify that value neither amend the reference counter anywhere else. |
| if (!throttleable_task_queue_) |
| return; |
| bool should_throttle = ShouldThrottleTimers(); |
| if (task_queue_throttled_ == should_throttle) |
| return; |
| task_queue_throttled_ = should_throttle; |
| |
| if (should_throttle) { |
| renderer_scheduler_->task_queue_throttler()->IncreaseThrottleRefCount( |
| throttleable_task_queue_.get()); |
| } else { |
| renderer_scheduler_->task_queue_throttler()->DecreaseThrottleRefCount( |
| throttleable_task_queue_.get()); |
| } |
| } |
| |
| base::WeakPtr<FrameSchedulerImpl> FrameSchedulerImpl::GetWeakPtr() { |
| return weak_factory_.GetWeakPtr(); |
| } |
| |
| bool FrameSchedulerImpl::IsExemptFromBudgetBasedThrottling() const { |
| return has_active_connection(); |
| } |
| |
| } // namespace scheduler |
| } // namespace blink |