Initialize GPU shader disk cache on brower thread.

content/browser/gpu/browser_gpu_channel_host_factory.h

 // Copyright (c) 2012 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_BROWSER_GPU_CHANNEL_HOST_FACTORY_H_
 #define CONTENT_BROWSER_GPU_BROWSER_GPU_CHANNEL_HOST_FACTORY_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 35 matching lines @@
   // Used to skip GpuChannelHost tests when there can be no GPU process.
   static bool CanUseForTesting();
 
  private:
   struct CreateRequest;
   class EstablishRequest;
 
   BrowserGpuChannelHostFactory();
   ~BrowserGpuChannelHostFactory() override;
 
+  void InitializeShaderDiskCacheOnIO();
+
   void GpuChannelEstablished();
   void CreateViewCommandBufferOnIO(
       CreateRequest* request,
       int32 surface_id,
       const GPUCreateCommandBufferConfig& init_params);
   static void CommandBufferCreatedOnIO(CreateRequest* request,
                                        CreateCommandBufferResult result);
   static void AddFilterOnIO(int gpu_host_id,
                             scoped_refptr<IPC::MessageFilter> filter);
 
   const int gpu_client_id_;
   const uint64_t gpu_client_tracing_id_;
   scoped_ptr<base::WaitableEvent> shutdown_event_;
   scoped_refptr<GpuChannelHost> gpu_channel_;
   scoped_ptr<BrowserGpuMemoryBufferManager> gpu_memory_buffer_manager_;
   int gpu_host_id_;
   scoped_refptr<EstablishRequest> pending_request_;
   std::vector<base::Closure> established_callbacks_;
 
   static BrowserGpuChannelHostFactory* instance_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserGpuChannelHostFactory);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GPU_BROWSER_GPU_CHANNEL_HOST_FACTORY_H_