Automated IWYU fix for TaskRunner includes.

services/ui/gpu/gpu_service_unittest.cc

 // Copyright 2017 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 "services/ui/gpu/gpu_service.h"
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "gpu/config/gpu_info.h"
 #include "gpu/ipc/service/gpu_watchdog_thread.h"
 #include "services/ui/public/interfaces/gpu.mojom.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace ui {
 namespace test {
 
 class GpuServiceTest : public testing::Test {
  public:
@@ skipping 66 matching lines @@
   base::WaitableEvent wait(base::WaitableEvent::ResetPolicy::MANUAL,
                            base::WaitableEvent::InitialState::NOT_SIGNALED);
   io_runner()->PostTask(FROM_HERE, base::Bind(&base::WaitableEvent::Signal,
                                               base::Unretained(&wait)));
   wait.Wait();
   DestroyService();
 }
 
 }  // namespace test
 }  // namespace ui