Automated IWYU fix for TaskRunner includes.

third_party/WebKit/Source/platform/scheduler/child/scheduler_tqm_delegate_for_test.h

 // 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.
 
 #ifndef THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_CHILD_SCHEDULER_TQM_DELEGATE_FOR_TEST_H_
 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_CHILD_SCHEDULER_TQM_DELEGATE_FOR_TEST_H_
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/macros.h"
+#include "base/single_thread_task_runner.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "platform/scheduler/child/scheduler_tqm_delegate.h"
 
 namespace blink {
 namespace scheduler {
 
 class TaskQueueManagerDelegateForTest;
 
 class SchedulerTqmDelegateForTest : public SchedulerTqmDelegate {
  public:
@@ skipping 33 matching lines @@
 
   scoped_refptr<TaskQueueManagerDelegateForTest> task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(SchedulerTqmDelegateForTest);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_CHILD_SCHEDULER_TQM_DELEGATE_FOR_TEST_H_