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diff --git a/o3d/gpu/command_buffer/common/bitfield_helpers.h b/o3d/gpu/command_buffer/common/bitfield_helpers.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 contains a helper template class used to access bit fields in
+// unsigned int_ts.
+
+#ifndef GPU_COMMAND_BUFFER_COMMON_CROSS_BITFIELD_HELPERS_H_
+#define GPU_COMMAND_BUFFER_COMMON_CROSS_BITFIELD_HELPERS_H_
+
+namespace command_buffer {
+
+// Bitfield template class, used to access bit fields in unsigned int_ts.
+template<int shift, int length> class BitField {
+ public:
+  static const unsigned int kShift = shift;
+  static const unsigned int kLength = length;
+  // the following is really (1<<length)-1 but also work for length == 32
+  // without compiler warning.
+  static const unsigned int kMask = 1U + ((1U << (length-1)) - 1U) * 2U;
+
+  // Gets the value contained in this field.
+  static unsigned int Get(unsigned int container) {
+    return (container >> kShift) & kMask;
+  }
+
+  // Makes a value that can be or-ed into this field.
+  static unsigned int MakeValue(unsigned int value) {
+    return (value & kMask) << kShift;
+  }
+
+  // Changes the value of this field.
+  static void Set(unsigned int *container, unsigned int field_value) {
+    *container = (*container & ~(kMask << kShift)) | MakeValue(field_value);
+  }
+};
+
+}  // namespace command_buffer
+
+#endif  // GPU_COMMAND_BUFFER_COMMON_CROSS_BITFIELD_HELPERS_H_