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diff --git a/WebKit/chromium/tests/TreeTestHelpers.h b/WebKit/chromium/tests/TreeTestHelpers.h
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+/*
+ * Copyright (C) 2010 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:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS 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 APPLE OR ITS 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.
+ */
+
+// Simple pseudorandom number generator helper functions, used by the
+// red-black and interval tree tests.
+//
+// These are **not** thread safe!
+
+#ifndef TreeTestHelpers_h
+#define TreeTestHelpers_h
+
+#include <stdint.h>
+
+namespace WebCore {
+namespace TreeTestHelpers {
+
+// Generates a seed value to be passed to initRandom().
+int32_t generateSeed();
+
+// Initializes the pseudo-random number generator with a specific seed.
+void initRandom(const int32_t seed);
+
+// Produces the next pseudo-random number in the sequence, in the
+// range from [0..maximumValue). Negative numbers are not allowed and will
+// produce undefined results.
+int32_t nextRandom(const int32_t maximumValue);
+
+} // namespace TreeTestHelpers
+} // namespace WebCore
+
+#endif // TreeTestHelpers_h