[scheduler]: Avoid waking up the scheduler to end long idle periods.

components/scheduler/child/scheduler_message_loop_delegate.cc

Index: components/scheduler/child/scheduler_message_loop_delegate.cc
diff --git a/components/scheduler/child/scheduler_message_loop_delegate.cc b/components/scheduler/child/scheduler_message_loop_delegate.cc
index 8c06e3087b1747ab8b6d1fd0db17c05ae5a4da8e..ba0d6b404e3dd3d5f7555e22b559e71046a7e658 100644
--- a/components/scheduler/child/scheduler_message_loop_delegate.cc
+++ b/components/scheduler/child/scheduler_message_loop_delegate.cc
@@ -43,4 +43,14 @@ bool SchedulerMessageLoopDelegate::IsNested() const {
   return message_loop_->IsNested();
 }
 
+void SchedulerMessageLoopDelegate::AddTaskObserver(
+    base::MessageLoop::TaskObserver* task_observer) {
+  return message_loop_->AddTaskObserver(task_observer);
+}
+
+void SchedulerMessageLoopDelegate::RemoveTaskObserver(
+    base::MessageLoop::TaskObserver* task_observer) {
+  return message_loop_->RemoveTaskObserver(task_observer);
+}
+
 }  // namespace scheduler