NOT FOR COMMIT: Move background pausing to the WebView level

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 81 matching lines @@
   void BeginFrameNotExpectedSoon() 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;
   void DidAnimateForInputOnCompositorThread() override;
   void OnRendererBackgrounded() override;
   void OnRendererForegrounded() override;
-  void SuspendRenderer() override;
-  void ResumeRenderer() override;
   void AddPendingNavigation(NavigatingFrameType type) override;
   void RemovePendingNavigation(NavigatingFrameType type) override;
   void OnNavigationStarted() override;
   bool IsHighPriorityWorkAnticipated() override;
   bool ShouldYieldForHighPriorityWork() override;
   bool CanExceedIdleDeadlineIfRequired() const override;
   void AddTaskObserver(base::MessageLoop::TaskObserver* task_observer) override;
   void RemoveTaskObserver(
       base::MessageLoop::TaskObserver* task_observer) override;
   void Shutdown() override;
   void SuspendTimerQueue() override;
   void ResumeTimerQueue() override;
-  void SetTimerQueueSuspensionWhenBackgroundedEnabled(bool enabled) override;
   void SetTopLevelBlameContext(
       base::trace_event::BlameContext* blame_context) override;
   void SetRAILModeObserver(RAILModeObserver* observer) override;
   bool MainThreadSeemsUnresponsive(
       base::TimeDelta main_thread_responsiveness_threshold) override;
 
   // RenderWidgetSignals::Observer implementation:
   void SetAllRenderWidgetsHidden(bool hidden) override;
   void SetHasVisibleRenderWidgetWithTouchHandler(
       bool has_visible_render_widget_with_touch_handler) override;
@@ skipping 189 matching lines @@
   static bool ShouldPrioritizeInputEvent(const WebInputEvent& web_input_event);
 
   // The amount of time which idle periods can continue being scheduled when the
   // renderer has been hidden, before going to sleep for good.
   static const int kEndIdleWhenHiddenDelayMillis = 10000;
 
   // The amount of time in milliseconds we have to respond to user input as
   // defined by RAILS.
   static const int kRailsResponseTimeMillis = 50;
 
-  // The amount of time to wait before suspending shared timers after the
-  // renderer has been backgrounded. This is used only if background suspension
-  // of shared timers is enabled.
-  static const int kSuspendTimersWhenBackgroundedDelayMillis = 5 * 60 * 1000;
-
   // The time we should stay in a priority-escalated mode after a call to
   // DidAnimateForInputOnCompositorThread().
   static const int kFlingEscalationLimitMillis = 100;
 
   // Schedules an immediate PolicyUpdate, if there isn't one already pending and
   // sets |policy_may_need_update_|. Note |any_thread_lock_| must be
   // locked.
   void EnsureUrgentPolicyUpdatePostedOnMainThread(
       const tracked_objects::Location& from_here);
 
@@ skipping 23 matching lines @@
   // scheduled. Must be called with |any_thread_lock_| held. Can be called from
   // any thread.
   UseCase ComputeCurrentUseCase(
       base::TimeTicks now,
       base::TimeDelta* expected_use_case_duration) const;
 
   // An input event of some sort happened, the policy may need updating.
   void UpdateForInputEventOnCompositorThread(WebInputEvent::Type type,
                                              InputEventState input_event_state);
 
-  // Helpers for safely suspending/resuming the timer queue after a
-  // background/foreground signal.
-  void SuspendTimerQueueWhenBackgrounded();
-  void ResumeTimerQueueWhenForegroundedOrResumed();
-
   // The task cost estimators and the UserModel need to be reset upon page
   // nagigation. This function does that. Must be called from the main thread.
   void ResetForNavigationLocked();
 
   // Estimates the maximum task length that won't cause a jank based on the
   // current system state. Must be called from the main thread.
   base::TimeDelta EstimateLongestJankFreeTaskDuration() const;
 
   // Report an intervention to all WebViews in this process.
   void BroadcastIntervention(const std::string& message);
@@ skipping 30 matching lines @@
   std::set<scoped_refptr<TaskQueue>> unthrottled_task_runners_;
   scoped_refptr<TaskQueue> default_loading_task_queue_;
   scoped_refptr<TaskQueue> default_timer_task_queue_;
 
   // Note |virtual_time_domain_| is lazily created.
   std::unique_ptr<AutoAdvancingVirtualTimeDomain> virtual_time_domain_;
 
   base::Closure update_policy_closure_;
   DeadlineTaskRunner delayed_update_policy_runner_;
   CancelableClosureHolder end_renderer_hidden_idle_period_closure_;
-  CancelableClosureHolder suspend_timers_when_backgrounded_closure_;
 
   using SeqLockQueueingTimeEstimator =
       device::SharedMemorySeqLockBuffer<QueueingTimeEstimator>;
 
   SeqLockQueueingTimeEstimator seqlock_queueing_time_estimator_;
 
   // We have decided to improve thread safety at the cost of some boilerplate
   // (the accessors) for the following data members.
 
   struct MainThreadOnly {
@@ skipping 14 matching lines @@
     base::TimeTicks estimated_next_frame_begin;
     base::TimeTicks current_task_start_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;
-    bool timer_queue_suspended_when_backgrounded;
     bool was_shutdown;
     bool loading_tasks_seem_expensive;
     bool timer_tasks_seem_expensive;
     bool touchstart_expected_soon;
     bool have_seen_a_begin_main_frame;
     bool have_reported_blocking_intervention_in_current_policy;
     bool have_reported_blocking_intervention_since_navigation;
     bool has_visible_render_widget_with_touch_handler;
     bool begin_frame_not_expected_soon;
     bool in_idle_period_for_testing;
@@ skipping 73 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_