Automated IWYU fix for TaskRunner includes.

services/ui/ws/gpu_host_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/ws/gpu_host.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/single_thread_task_runner.h"
 #include "gpu/config/gpu_info.h"
 #include "services/ui/gpu/gpu_service.h"
 #include "services/ui/public/interfaces/gpu.mojom.h"
 #include "services/ui/ws/gpu_client.h"
 #include "services/ui/ws/gpu_host_delegate.h"
 
 #if defined(USE_X11)
 #include <X11/Xlib.h>
 #undef None
 #undef Bool
@@ skipping 92 matching lines @@
 TEST_F(GpuHostTest, GpuClientDestructionOrder) {
   base::WeakPtr<GpuClient> client_ref = AddGpuClient();
   EXPECT_NE(nullptr, client_ref);
   DestroyHost();
   EXPECT_EQ(nullptr, client_ref);
 }
 
 }  // namespace test
 }  // namespace ws
 }  // namespace ui