Add SHA1 data checksum to on-disk shader cache

content/browser/gpu/gpu_process_host.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_GPU_PROCESS_HOST_H_
 #define CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 201 matching lines @@
 
   bool LaunchGpuProcess(gpu::GpuPreferences* gpu_preferences);
 
   void SendOutstandingReplies();
 
   void BlockLiveOffscreenContexts();
 
   // Update GPU crash counters.  Disable GPU if crash limit is reached.
   void RecordProcessCrash();
 
-  std::string GetShaderPrefixKey();
+  std::string GetShaderPrefixKey(const std::string& shader);
 
   // The serial number of the GpuProcessHost / GpuProcessHostUIShim pair.
   int host_id_;
 
   // These are the channel requests that we have already sent to
   // the GPU process, but haven't heard back about yet.
   std::queue<EstablishChannelRequest> channel_requests_;
 
   // The pending create gpu memory buffer requests we need to reply to.
   std::queue<CreateGpuMemoryBufferCallback> create_gpu_memory_buffer_requests_;
@@ skipping 47 matching lines @@
   // assumed to be associated with untrusted content such as WebGL.
   // For best robustness, when any context lost notification is
   // received, assume all of these URLs are guilty, and block
   // automatic execution of 3D content from those domains.
   std::multiset<GURL> urls_with_live_offscreen_contexts_;
 
   typedef std::map<int32_t, scoped_refptr<gpu::ShaderDiskCache>>
       ClientIdToShaderCacheMap;
   ClientIdToShaderCacheMap client_id_to_shader_cache_;
 
-  std::string shader_prefix_key_;
+  std::string shader_prefix_key_info_;
 
   ui::mojom::GpuMainAssociatedPtr gpu_main_ptr_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuProcessHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_H_