Automated IWYU fix for TaskRunner includes.

third_party/WebKit/Source/platform/scheduler/child/scheduler_tqm_delegate_impl_unittest.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 "platform/scheduler/child/scheduler_tqm_delegate_impl.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "base/test/test_simple_task_runner.h"
 #include "base/time/default_tick_clock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 namespace scheduler {
 
 TEST(SchedulerTqmDelegateImplTest, TestTaskRunnerOverriding) {
   base::MessageLoop loop;
   scoped_refptr<base::SingleThreadTaskRunner> original_runner(
       loop.task_runner());
   scoped_refptr<base::SingleThreadTaskRunner> custom_runner(
       new base::TestSimpleTaskRunner());
   {
     scoped_refptr<SchedulerTqmDelegateImpl> delegate(
         SchedulerTqmDelegateImpl::Create(
             &loop, base::MakeUnique<base::DefaultTickClock>()));
     delegate->SetDefaultTaskRunner(custom_runner);
     DCHECK_EQ(custom_runner, loop.task_runner());
   }
   DCHECK_EQ(original_runner, loop.task_runner());
 }
 
 }  // namespace scheduler
 }  // namespace blink