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

components/scheduler/child/scheduler_message_loop_delegate.cc

 // Copyright 2015 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.
 
 #include "components/scheduler/child/scheduler_message_loop_delegate.h"
 
 namespace scheduler {
 
 // static
 scoped_refptr<SchedulerMessageLoopDelegate>
@@ skipping 25 matching lines @@
 }
 
 bool SchedulerMessageLoopDelegate::RunsTasksOnCurrentThread() const {
   return message_loop_->task_runner()->RunsTasksOnCurrentThread();
 }
 
 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