Add support for GL_CHROMIUM_pixel_transfer_buffer_object.

gpu/command_buffer/service/common_decoder.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_COMMON_DECODER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_COMMON_DECODER_H_
 
 #include <map>
 #include <stack>
 #include <string>
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "gpu/command_buffer/service/cmd_parser.h"
 #include "gpu/gpu_export.h"
 
 namespace gpu {
 
 class CommandBufferEngine;
 
 // This class is a helper base class for implementing the common parts of the
 // o3d/gl2 command buffer decoder.
-class GPU_EXPORT CommonDecoder : NON_EXPORTED_BASE(public AsyncAPIInterface) {
+class GPU_EXPORT CommonDecoder : public base::SupportsWeakPtr<CommonDecoder>,
+                                 NON_EXPORTED_BASE(public AsyncAPIInterface) {
  public:
   typedef error::Error Error;
 
   static const unsigned int kMaxStackDepth = 32;
 
   // A bucket is a buffer to help collect memory across a command buffer. When
   // creating a command buffer implementation of an existing API, sometimes that
   // API has functions that take a pointer to data.  A good example is OpenGL's
   // glBufferData. Because the data is separated between client and service,
   // there are 2 ways to get this data across. 1 is to put all the data in
@@ skipping 141 matching lines @@
 
     uint32 offset;
   };
   std::stack<CommandAddress> call_stack_;
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_COMMON_DECODER_H_