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diff --git a/o3d/gpu/command_buffer/client/gles2_implementation.h b/o3d/gpu/command_buffer/client/gles2_implementation.h
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+++ b/o3d/gpu/command_buffer/client/gles2_implementation.h
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+// Copyright (c) 2006-2009 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_CLIENT_GLES2_HELPER_H
+#define GPU_COMMAND_BUFFER_CLIENT_GLES2_HELPER_H
+
+#include "gpu/command_buffer/client/gles2_cmd_helper.h"
+#include "gpu/command_buffer/client/id_allocator.h"
+
+namespace command_buffer {
+namespace gles2 {
+
+// A class to help with shared memory.
+class SharedMemoryHelper {
+ public:
+  SharedMemoryHelper(
+      unsigned int id,
+      void* address)
+      : id_(id),
+        address_(address) {
+  }
+
+  unsigned int GetOffset(void* address) const {
+    return static_cast<int8*>(address) -
+           static_cast<int8*>(address_);
+  }
+
+  void* GetAddress(unsigned int offset) const {
+    return static_cast<int8*>(address_) + offset;
+  }
+
+  template <typename T>
+  T GetAddressAs(unsigned int offset) const {
+    return static_cast<T>(GetAddress(offset));
+  }
+
+  unsigned int GetId() const {
+    return id_;
+  }
+
+ private:
+  ResourceId id_;
+  void* address_;
+
+  DISALLOW_COPY_AND_ASSIGN(SharedMemoryHelper);
+};
+
+// This class emulates GLES2 over command buffers. It can be used by a client
+// program so that the program does not need deal with shared memory and command
+// buffer management. See gl2_lib.h.  Note that there is a performance gain to
+// be had by changing your code to use command buffers directly by using the
+// GLES2CmdHelper but that entails changing your code to use and deal with
+// shared memory and synchronization issues.
+class GLES2Implementation {
+ public:
+  GLES2Implementation(
+      GLES2CmdHelper* helper,
+      ResourceId shared_memory_id,
+      void* shared_memory);
+
+  // Include the auto-generated part of this class. We split this because
+  // it means we can easily edit the non-auto generated parts right here in
+  // this file instead of having to edit some template or the code generator.
+  #include "gpu/command_buffer/client/gles2_implementation_autogen.h"
+
+ private:
+  // Makes a set of Ids for glGen___ functions.
+  void MakeIds(GLsizei n, GLuint* ids);
+
+  // Frees a set of Ids for glDelete___ functions.
+  void FreeIds(GLsizei n, const GLuint* ids);
+
+  GLES2Util util_;
+  GLES2CmdHelper* helper_;
+  IdAllocator id_allocator_;
+  SharedMemoryHelper shared_memory_;
+
+  // pack alignment as last set by glPixelStorei
+  GLint pack_alignment_;
+
+  // unpack alignment as last set by glPixelStorei
+  GLint unpack_alignment_;
+
+  DISALLOW_COPY_AND_ASSIGN(GLES2Implementation);
+};
+
+
+}  // namespace gles2
+}  // namespace command_buffer
+
+#endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_HELPER_H
+