gpu: Add async pixel transfer interface, stub and tests.

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 "gpu/command_buffer/common/buffer.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) {
@@ skipping 99 matching lines @@
                                unsigned int offset,
                                unsigned int size);
 
   // Typed version of GetAddressAndCheckSize.
   template <typename T>
   T GetSharedMemoryAs(unsigned int shm_id, unsigned int offset,
                       unsigned int size) {
     return static_cast<T>(GetAddressAndCheckSize(shm_id, offset, size));
   }
 
+  // Get the actual shared memory buffer.
+  Buffer GetSharedMemoryBuffer(unsigned int shm_id);
+
  protected:
   // Executes a common command.
   // Parameters:
   //    command: the command index.
   //    arg_count: the number of CommandBufferEntry arguments.
   //    cmd_data: the command data.
   // Returns:
   //   error::kNoError if no error was found, one of
   //   error::Error otherwise.
   error::Error DoCommonCommand(
@@ skipping 32 matching lines @@
 
     uint32 offset;
   };
   std::stack<CommandAddress> call_stack_;
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_COMMON_DECODER_H_