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diff --git a/o3d/gpu/command_buffer/service/cmd_buffer_engine.h b/o3d/gpu/command_buffer/service/cmd_buffer_engine.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.
+ */
+
+
+// This file defines the CommandBufferEngine class, providing the main loop for
+// the service, exposing the RPC API, managing the command parser.
+
+#ifndef GPU_COMMAND_BUFFER_SERVICE_CROSS_CMD_BUFFER_ENGINE_H_
+#define GPU_COMMAND_BUFFER_SERVICE_CROSS_CMD_BUFFER_ENGINE_H_
+
+#include "base/basictypes.h"
+
+namespace command_buffer {
+
+class CommandBufferEngine {
+ public:
+  CommandBufferEngine() {
+  }
+
+  virtual ~CommandBufferEngine() {
+  }
+
+  // Gets the base address of a registered shared memory buffer.
+  // Parameters:
+  //   shm_id: the identifier for the shared memory buffer.
+  virtual void *GetSharedMemoryAddress(int32 shm_id) = 0;
+
+  // Gets the size of a registered shared memory buffer.
+  // Parameters:
+  //   shm_id: the identifier for the shared memory buffer.
+  virtual size_t GetSharedMemorySize(int32 shm_id) = 0;
+
+  // Sets the token value.
+  virtual void set_token(int32 token) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CommandBufferEngine);
+};
+
+}  // namespace command_buffer
+
+#endif  // GPU_COMMAND_BUFFER_SERVICE_CROSS_CMD_BUFFER_ENGINE_H_