scheduler: Disable expensive timers during main thread user input

components/scheduler/child/task_queue_manager.cc

Index: components/scheduler/child/task_queue_manager.cc
diff --git a/components/scheduler/child/task_queue_manager.cc b/components/scheduler/child/task_queue_manager.cc
index 7d0d1ad3e054bf0f1b71a23ff010ce62d7ea73a2..8979750550375422fb7335971b78484e6341a1a3 100644
--- a/components/scheduler/child/task_queue_manager.cc
+++ b/components/scheduler/child/task_queue_manager.cc
@@ -337,6 +337,7 @@ bool TaskQueueManager::ProcessTaskFromWorkQueue(
     if (queue->GetShouldNotifyObservers()) {
       FOR_EACH_OBSERVER(base::MessageLoop::TaskObserver, task_observers_,
                         WillProcessTask(pending_task));
+      queue->NotifyWillProcessTask(pending_task);
     }
     TRACE_EVENT1(disabled_by_default_tracing_category_,
                  "Run Task From Queue", "queue", queue->GetName());
@@ -350,6 +351,7 @@ bool TaskQueueManager::ProcessTaskFromWorkQueue(
     if (queue->GetShouldNotifyObservers()) {
       FOR_EACH_OBSERVER(base::MessageLoop::TaskObserver, task_observers_,
                         DidProcessTask(pending_task));
+      queue->NotifyDidProcessTask(pending_task);
     }
 
     pending_task.task.Reset();