Automated IWYU fix for TaskRunner includes.

gpu/ipc/host/shader_disk_cache.h

 // Copyright (c) 2013 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 GPU_IPC_HOST_SHADER_DISK_CACHE_H_
 #define GPU_IPC_HOST_SHADER_DISK_CACHE_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <queue>
 #include <string>
 #include <unordered_map>
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/single_thread_task_runner.h"
 #include "base/threading/thread_checker.h"
 #include "net/disk_cache/disk_cache.h"
 
 namespace gpu {
 
 class ShaderCacheFactory;
 class ShaderDiskCacheEntry;
 class ShaderDiskReadHelper;
 class ShaderClearHelper;
 
@@ skipping 128 matching lines @@
   using ShaderClearQueue = std::queue<std::unique_ptr<ShaderClearHelper>>;
   using ShaderClearMap = std::map<base::FilePath, ShaderClearQueue>;
   ShaderClearMap shader_clear_map_;
 
   DISALLOW_COPY_AND_ASSIGN(ShaderCacheFactory);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_IPC_HOST_SHADER_DISK_CACHE_H_