scheduler: Implement task observers

content/renderer/scheduler/null_renderer_scheduler.cc

 // Copyright 2014 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 "content/renderer/scheduler/null_renderer_scheduler.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop_proxy.h"
 
 namespace content {
@@ skipping 71 matching lines @@
   return false;
 }
 
 bool NullRendererScheduler::ShouldYieldForHighPriorityWork() {
   return false;
 }
 
 void NullRendererScheduler::Shutdown() {
 }
 
+void NullRendererScheduler::AddTaskObserver(
+    base::MessageLoop::TaskObserver* task_observer) {
+  base::MessageLoop::current()->AddTaskObserver(task_observer);
+}
+
+void NullRendererScheduler::RemoveTaskObserver(
+    base::MessageLoop::TaskObserver* task_observer) {
+  base::MessageLoop::current()->RemoveTaskObserver(task_observer);
+}
+
 }  // namespace content