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diff --git a/o3d/gpu/command_buffer/service/common_decoder.h b/o3d/gpu/command_buffer/service/common_decoder.h
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+/*
+ * Copyright 2009, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GPU_COMMAND_BUFFER_SERVICE_CROSS_COMMON_DECODER_H_
+#define GPU_COMMAND_BUFFER_SERVICE_CROSS_COMMON_DECODER_H_
+
+#include "gpu/command_buffer/service/cmd_parser.h"
+
+namespace command_buffer {
+
+class CommandBufferEngine;
+
+// This class is a helper base class for implementing the common parts of the
+// o3d/gl2 command buffer decoder.
+class CommonDecoder : public AsyncAPIInterface {
+ public:
+  typedef parse_error::ParseError ParseError;
+
+  CommonDecoder() : engine_(NULL) {
+  }
+  virtual ~CommonDecoder() {
+  }
+
+  // Sets the engine, to get shared memory buffers from, and to set the token
+  // to.
+  void set_engine(CommandBufferEngine* engine) {
+    engine_ = engine;
+  }
+
+ protected:
+  // Executes a common command.
+  // Parameters:
+  //    command: the command index.
+  //    arg_count: the number of CommandBufferEntry arguments.
+  //    cmd_data: the command data.
+  // Returns:
+  //   parse_error::NO_ERROR if no error was found, one of
+  //   parse_error::ParseError otherwise.
+  parse_error::ParseError DoCommonCommand(
+      unsigned int command,
+      unsigned int arg_count,
+      const void* cmd_data);
+
+  // Gets the address of shared memory data, given a shared memory ID and an
+  // offset. Also checks that the size is consistent with the shared memory
+  // size.
+  // Parameters:
+  //   shm_id: the id of the shared memory buffer.
+  //   offset: the offset of the data in the shared memory buffer.
+  //   size: the size of the data.
+  // Returns:
+  //   NULL if shm_id isn't a valid shared memory buffer ID or if the size
+  //   check fails. Return a pointer to the data otherwise.
+  void* GetAddressAndCheckSize(unsigned int shm_id,
+                               unsigned int offset,
+                               unsigned int size);
+
+  // Gets an name for a common command.
+  const char* GetCommonCommandName(cmd::CommandId command_id) const;
+
+ private:
+  // Generate a member function prototype for each command in an automated and
+  // typesafe way.
+  #define COMMON_COMMAND_BUFFER_CMD_OP(name)             \
+     parse_error::ParseError Handle ## name(             \
+       unsigned int arg_count,                           \
+       const cmd::name& args);                           \
+
+  COMMON_COMMAND_BUFFER_CMDS(COMMON_COMMAND_BUFFER_CMD_OP)
+
+  #undef COMMON_COMMAND_BUFFER_CMD_OP
+
+  CommandBufferEngine* engine_;
+};
+
+}  // namespace command_buffer
+
+#endif  // GPU_COMMAND_BUFFER_SERVICE_CROSS_COMMON_DECODER_H_
+