Modified GPU command signature hash to use a binary representation.

gpu/command_buffer/service/texture_manager.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 GPU_COMMAND_BUFFER_SERVICE_TEXTURE_MANAGER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_TEXTURE_MANAGER_H_
 
 #include <algorithm>
 #include <list>
 #include <set>
@@ skipping 662 matching lines @@
         memory_tracker_managed_->GetMemRepresented() +
         memory_tracker_unmanaged_->GetMemRepresented();
   }
 
   void SetLevelImage(
       TextureRef* ref,
       GLenum target,
       GLint level,
       gfx::GLImage* image);
 
+  size_t GetSignatureSize() const;
+
   void AddToSignature(
       TextureRef* ref,
       GLenum target,
       GLint level,
       std::string* signature) const;
 
   void AddObserver(DestructionObserver* observer) {
     destruction_observers_.push_back(observer);
   }
 
@@ skipping 129 matching lines @@
  private:
   DecoderTextureState* texture_state_;
   base::TimeTicks begin_time_;
   DISALLOW_COPY_AND_ASSIGN(ScopedTextureUploadTimer);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_TEXTURE_MANAGER_H_