Implement PostDelayedTaskAt for guaranteed timer ordering

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() {
 }
 
 FakeRendererScheduler::~FakeRendererScheduler() {
 }
 
-scoped_refptr<base::SingleThreadTaskRunner>
-FakeRendererScheduler::DefaultTaskRunner() {
+scoped_refptr<scheduler::TaskQueue> FakeRendererScheduler::DefaultTaskRunner() {
   return nullptr;
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 FakeRendererScheduler::CompositorTaskRunner() {
   return nullptr;
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 FakeRendererScheduler::LoadingTaskRunner() {
   return nullptr;
 }
 
 scoped_refptr<scheduler::SingleThreadIdleTaskRunner>
 FakeRendererScheduler::IdleTaskRunner() {
   return nullptr;
 }
 
-scoped_refptr<base::SingleThreadTaskRunner>
-FakeRendererScheduler::TimerTaskRunner() {
+scoped_refptr<scheduler::TaskQueue> FakeRendererScheduler::TimerTaskRunner() {
   return nullptr;
 }
 
 void FakeRendererScheduler::WillBeginFrame(const cc::BeginFrameArgs& args) {
 }
 
 void FakeRendererScheduler::BeginFrameNotExpectedSoon() {
 }
 
 void FakeRendererScheduler::DidCommitFrameToCompositor() {
@@ skipping 43 matching lines @@
 void FakeRendererScheduler::Shutdown() {
 }
 
 void FakeRendererScheduler::SuspendTimerQueue() {
 }
 
 void FakeRendererScheduler::ResumeTimerQueue() {
 }
 
 }  // namespace content