Introduce gpu_fuzzer to fuzz the GPU command buffers

gpu/command_buffer/service/command_buffer_service.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_COMMAND_BUFFER_SERVICE_H_
 #define GPU_COMMAND_BUFFER_SERVICE_COMMAND_BUFFER_SERVICE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 77 matching lines @@
   // Setup the shared memory that shared state should be copied into.
   void SetSharedStateBuffer(std::unique_ptr<BufferBacking> shared_state_buffer);
 
   // Copy the current state into the shared state transfer buffer.
   void UpdateState();
 
   // Registers an existing shared memory object and get an ID that can be used
   // to identify it in the command buffer.
   bool RegisterTransferBuffer(int32_t id,
                               std::unique_ptr<BufferBacking> buffer);
+  scoped_refptr<Buffer> CreateTransferBufferWithId(size_t size, int32_t id);
 
  private:
   int32_t ring_buffer_id_;
   scoped_refptr<Buffer> ring_buffer_;
   std::unique_ptr<BufferBacking> shared_state_buffer_;
   CommandBufferSharedState* shared_state_;
   int32_t num_entries_;
   int32_t get_offset_;
   int32_t put_offset_;
   base::Closure put_offset_change_callback_;
   GetBufferChangedCallback get_buffer_change_callback_;
   base::Closure parse_error_callback_;
   scoped_refptr<TransferBufferManagerInterface> transfer_buffer_manager_;
   int32_t token_;
   uint32_t generation_;
   error::Error error_;
   error::ContextLostReason context_lost_reason_;
 
   DISALLOW_COPY_AND_ASSIGN(CommandBufferService);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_COMMAND_BUFFER_SERVICE_H_