Adds a SHUTDOWN_TASK_QUEUE and a PreShutdown api to the scheduler.

content/test/fake_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/test/fake_renderer_scheduler.h"
 
 namespace content {
 
 FakeRendererScheduler::FakeRendererScheduler() {
 }
@@ skipping 19 matching lines @@
 scoped_refptr<scheduler::SingleThreadIdleTaskRunner>
 FakeRendererScheduler::IdleTaskRunner() {
   return nullptr;
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 FakeRendererScheduler::TimerTaskRunner() {
   return nullptr;
 }
 
+scoped_refptr<base::SingleThreadTaskRunner>
+FakeRendererScheduler::ShutdownTaskRunner() {
+  return nullptr;
+}
+
 void FakeRendererScheduler::WillBeginFrame(const cc::BeginFrameArgs& args) {
 }
 
 void FakeRendererScheduler::BeginFrameNotExpectedSoon() {
 }
 
 void FakeRendererScheduler::DidCommitFrameToCompositor() {
 }
 
 void FakeRendererScheduler::DidReceiveInputEventOnCompositorThread(
@@ skipping 22 matching lines @@
 }
 
 void FakeRendererScheduler::AddTaskObserver(
     base::MessageLoop::TaskObserver* task_observer) {
 }
 
 void FakeRendererScheduler::RemoveTaskObserver(
     base::MessageLoop::TaskObserver* task_observer) {
 }
 
+void FakeRendererScheduler::PreShutdown() {
+}
+
 void FakeRendererScheduler::Shutdown() {
 }
 
 void FakeRendererScheduler::SuspendTimerQueue() {
 }
 
 void FakeRendererScheduler::ResumeTimerQueue() {
 }
 
 }  // namespace content