Automated IWYU fix for TaskRunner includes.

content/browser/gpu/shader_cache_factory.h

 // Copyright 2016 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 CONTENT_BROWSER_GPU_SHADER_CACHE_FACTORY_H_
 #define CONTENT_BROWSER_GPU_SHADER_CACHE_FACTORY_H_
 
+#include "base/single_thread_task_runner.h"
 #include "content/common/content_export.h"
 #include "gpu/ipc/host/shader_disk_cache.h"
 
 namespace content {
 
 // Initializes the ShaderCacheFactory singleton instance. The singleton
 // instance is created and used in the thread associated with |task_runner|.
 // |cache_task_runner| is associated with the thread responsible for managing
 // the disk cache.
 CONTENT_EXPORT void InitShaderCacheFactorySingleton(
     scoped_refptr<base::SingleThreadTaskRunner> task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> cache_task_runner);
 
 // Returns an instance previously created by InitShaderCacheFactorySingleton().
 // This can return nullptr if an instance has not yet been created.
 CONTENT_EXPORT gpu::ShaderCacheFactory* GetShaderCacheFactorySingleton();
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GPU_SHADER_CACHE_FACTORY_H_