A better idle time estimator

components/scheduler/renderer/renderer_scheduler_impl.h

Index: components/scheduler/renderer/renderer_scheduler_impl.h
diff --git a/components/scheduler/renderer/renderer_scheduler_impl.h b/components/scheduler/renderer/renderer_scheduler_impl.h
index dbe1c003cd671a0d892564032a765833d50019a0..641b08a26c77353381c858d88a0574be1c3a395e 100644
--- a/components/scheduler/renderer/renderer_scheduler_impl.h
+++ b/components/scheduler/renderer/renderer_scheduler_impl.h
@@ -11,6 +11,7 @@
 #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/renderer_scheduler.h"
 #include "components/scheduler/renderer/task_cost_estimator.h"
 #include "components/scheduler/renderer/user_model.h"
@@ -234,12 +235,11 @@ class SCHEDULER_EXPORT RendererSchedulerImpl
 
     TaskCostEstimator loading_task_cost_estimator;
     TaskCostEstimator timer_task_cost_estimator;
-    cc::RollingTimeDeltaHistory short_idle_period_duration;
+    IdleTimeEstimator idle_time_estimator;
     UseCase current_use_case;
     Policy current_policy;
     base::TimeTicks current_policy_expiration_time;
     base::TimeTicks estimated_next_frame_begin;
-    base::TimeDelta expected_short_idle_period_duration;
     int timer_queue_suspend_count;  // TIMER_TASK_QUEUE suspended if non-zero.
     int navigation_task_expected_count;
     bool renderer_hidden;