Report expected task queueing time via UMA

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 6c1628fc5aac3965717d89b8785bbf4ad988611f..6132354023c9b56c0a10c95ab1ac7fdc7eec3e50 100644
--- a/components/scheduler/renderer/renderer_scheduler_impl.h
+++ b/components/scheduler/renderer/renderer_scheduler_impl.h
@@ -13,6 +13,7 @@
 #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/queueing_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"
@@ -36,7 +37,8 @@ class SCHEDULER_EXPORT RendererSchedulerImpl
     : public RendererScheduler,
       public IdleHelper::Delegate,
       public SchedulerHelper::Observer,
-      public RenderWidgetSignals::Observer {
+      public RenderWidgetSignals::Observer,
+      public QueueingTimeEstimator::QueueingTimeEstimatorClient {
  public:
   RendererSchedulerImpl(scoped_refptr<SchedulerTqmDelegate> main_task_runner);
   ~RendererSchedulerImpl() override;
@@ -89,6 +91,9 @@ class SCHEDULER_EXPORT RendererSchedulerImpl
   void OnTriedToExecuteBlockedTask(const TaskQueue& queue,
                                    const base::PendingTask& task) override;
 
+  // QueueingTimeEstimator::QueueingTimeEstimatorClient implementation:
+  void OnQueueingTimeForWindowEstimated(base::TimeDelta queueing_time) override;
+
   // Returns a task runner where tasks run at the highest possible priority.
   scoped_refptr<TaskQueue> ControlTaskRunner();
 
@@ -316,13 +321,15 @@ class SCHEDULER_EXPORT RendererSchedulerImpl
   // (the accessors) for the following data members.
 
   struct MainThreadOnly {
-    MainThreadOnly(const scoped_refptr<TaskQueue>& compositor_task_runner,
+    MainThreadOnly(RendererSchedulerImpl* renderer_scheduler_impl,
+                   const scoped_refptr<TaskQueue>& compositor_task_runner,
                    base::TickClock* time_source);
     ~MainThreadOnly();
 
     TaskCostEstimator loading_task_cost_estimator;
     TaskCostEstimator timer_task_cost_estimator;
     IdleTimeEstimator idle_time_estimator;
+    QueueingTimeEstimator queueing_time_estimator;
     UseCase current_use_case;
     Policy current_policy;
     base::TimeTicks current_policy_expiration_time;