Introduce gpu_fuzzer to fuzz the GPU command buffers

gpu/command_buffer/service/buffer_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_BUFFER_MANAGER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_BUFFER_MANAGER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 246 matching lines @@
     ContextState* context_state, GLenum target, GLenum pname, GLint64* params);
 
   // Validates a glGetBufferParameteriv, and then calls GetBufferParameteriv if
   // validation was successful.
   void ValidateAndDoGetBufferParameteriv(
     ContextState* context_state, GLenum target, GLenum pname, GLint* params);
 
   // Sets the target of a buffer. Returns false if the target can not be set.
   bool SetTarget(Buffer* buffer, GLenum target);
 
+  void set_max_buffer_size(GLsizeiptr max_buffer_size) {
+    max_buffer_size_ = max_buffer_size;
+  }
+
   void set_allow_buffers_on_multiple_targets(bool allow) {
     allow_buffers_on_multiple_targets_ = allow;
   }
 
   void set_allow_fixed_attribs(bool allow) {
     allow_fixed_attribs_ = allow;
   }
 
   size_t mem_represented() const {
     return memory_type_tracker_->GetMemRepresented();
@@ skipping 55 matching lines @@
                bool use_shadow);
 
   std::unique_ptr<MemoryTypeTracker> memory_type_tracker_;
   MemoryTracker* memory_tracker_;
   scoped_refptr<FeatureInfo> feature_info_;
 
   // Info for each buffer in the system.
   typedef base::hash_map<GLuint, scoped_refptr<Buffer> > BufferMap;
   BufferMap buffers_;
 
+  // The maximum size of buffers.
+  GLsizeiptr max_buffer_size_;
+
   // Whether or not buffers can be bound to multiple targets.
   bool allow_buffers_on_multiple_targets_;
 
   // Whether or not allow using GL_FIXED type for vertex attribs.
   bool allow_fixed_attribs_;
 
   // Counts the number of Buffer allocated with 'this' as its manager.
   // Allows to check no Buffer will outlive this.
   unsigned int buffer_count_;
 
   GLuint primitive_restart_fixed_index_;
 
   bool lost_context_;
   bool use_client_side_arrays_for_stream_buffers_;
 
   DISALLOW_COPY_AND_ASSIGN(BufferManager);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_BUFFER_MANAGER_H_