Move throttling of background timers into the renderer scheduler

components/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 COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_
 #define COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_
 
 #include "base/atomicops.h"
 #include "base/synchronization/lock.h"
 #include "components/scheduler/base/pollable_thread_safe_flag.h"
 #include "components/scheduler/child/idle_helper.h"
 #include "components/scheduler/child/scheduler_helper.h"
 #include "components/scheduler/renderer/deadline_task_runner.h"
 #include "components/scheduler/renderer/idle_time_estimator.h"
 #include "components/scheduler/renderer/render_widget_signals.h"
 #include "components/scheduler/renderer/renderer_scheduler.h"
 #include "components/scheduler/renderer/task_cost_estimator.h"
+#include "components/scheduler/renderer/throttling_helper.h"
 #include "components/scheduler/renderer/user_model.h"
 #include "components/scheduler/scheduler_export.h"
 
 namespace base {
 namespace trace_event {
 class ConvertableToTraceFormat;
 }
 }
 
 namespace scheduler {
 class RenderWidgetSchedulingState;
+class ThrottlingHelper;
 
 class SCHEDULER_EXPORT RendererSchedulerImpl
     : public RendererScheduler,
       public IdleHelper::Delegate,
       public SchedulerHelper::Observer,
       public RenderWidgetSignals::Observer {
  public:
   RendererSchedulerImpl(scoped_refptr<SchedulerTqmDelegate> main_task_runner);
   ~RendererSchedulerImpl() override;
 
@@ skipping 36 matching lines @@
   double MonotonicallyIncreasingTimeSeconds() const override;
 
   // RenderWidgetSignals::Observer implementation:
   void SetAllRenderWidgetsHidden(bool hidden) override;
   void SetHasVisibleRenderWidgetWithTouchHandler(
       bool has_visible_render_widget_with_touch_handler) override;
 
   // TaskQueueManager::Observer implementation:
   void OnUnregisterTaskQueue(const scoped_refptr<TaskQueue>& queue) override;
 
+  // Returns a task runner where tasks run at the highest possible priority.
+  scoped_refptr<TaskQueue> ControlTaskRunner();
+
+  void RegisterTimeDomain(const scoped_refptr<TimeDomain>& time_domain);
+  void UnregisterTimeDomain(const scoped_refptr<TimeDomain>& time_domain);
+
   // Test helpers.
   SchedulerHelper* GetSchedulerHelperForTesting();
   TaskCostEstimator* GetLoadingTaskCostEstimatorForTesting();
   TaskCostEstimator* GetTimerTaskCostEstimatorForTesting();
   IdleTimeEstimator* GetIdleTimeEstimatorForTesting();
   base::TimeTicks CurrentIdleTaskDeadlineForTesting() const;
 
+  const scoped_refptr<RealTimeDomain>& real_time_domain() const {
+    return helper_.real_time_domain();
+  }
+
+  ThrottlingHelper* throttling_helper() { return &throttling_helper_; }
+
  private:
   friend class RendererSchedulerImplTest;
   friend class RendererSchedulerImplForTest;
   friend class RenderWidgetSchedulingState;
 
   struct Policy {
     Policy();
 
     TaskQueue::QueuePriority compositor_queue_priority;
     TaskQueue::QueuePriority loading_queue_priority;
@@ skipping 124 matching lines @@
   // background/foreground signal.
   void SuspendTimerQueueWhenBackgrounded();
   void ResumeTimerQueueWhenForegrounded();
 
   // 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();
 
   SchedulerHelper helper_;
   IdleHelper idle_helper_;
+  ThrottlingHelper throttling_helper_;
   RenderWidgetSignals render_widget_scheduler_signals_;
 
   const scoped_refptr<TaskQueue> control_task_runner_;
   const scoped_refptr<TaskQueue> compositor_task_runner_;
   std::set<scoped_refptr<TaskQueue>> loading_task_runners_;
   std::set<scoped_refptr<TaskQueue>> timer_task_runners_;
   scoped_refptr<TaskQueue> default_loading_task_runner_;
   scoped_refptr<TaskQueue> default_timer_task_runner_;
+  scoped_refptr<VirtualTimeDomain> virtual_time_domain_;

[Sami, 2015/11/24 12:48:48]

Is this used for anything?

[alex clarke (OOO till 29th), 2015/11/25 12:29:36]

Done.

 
   base::Closure update_policy_closure_;
   DeadlineTaskRunner delayed_update_policy_runner_;
   CancelableClosureHolder end_renderer_hidden_idle_period_closure_;
   CancelableClosureHolder suspend_timers_when_backgrounded_closure_;
 
   // We have decided to improve thread safety at the cost of some boilerplate
   // (the accessors) for the following data members.
 
   struct MainThreadOnly {
@@ skipping 88 matching lines @@
 
   PollableThreadSafeFlag policy_may_need_update_;
   base::WeakPtrFactory<RendererSchedulerImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererSchedulerImpl);
 };
 
 }  // namespace scheduler
 
 #endif  // COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_