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diff --git a/services/surfaceflinger/Tokenizer.h b/services/surfaceflinger/Tokenizer.h
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+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_TOKENIZER_H
+#define ANDROID_TOKENIZER_H
+
+#include <utils/Vector.h>
+#include <utils/Errors.h>
+
+// ----------------------------------------------------------------------------
+
+namespace android {
+
+class Tokenizer
+{
+public:
+                Tokenizer();
+                Tokenizer(const Tokenizer& other);
+                ~Tokenizer();
+
+    uint32_t    acquire();
+    status_t    reserve(uint32_t token);
+    status_t    release(uint32_t token);
+    bool        isAcquired(uint32_t token) const;
+
+    void dump() const;
+
+    struct run_t {
+        run_t() {};
+        run_t(uint32_t f, uint32_t l) : first(f), length(l) {}
+        uint32_t    first;
+        uint32_t    length;
+    };
+private:
+    ssize_t _indexOrderOf(uint32_t token, size_t* order=0) const;
+    ssize_t _insertTokenAt(uint32_t token, size_t index);
+    Vector<run_t>   mRanges;
+};
+
+}; // namespace android
+
+// ----------------------------------------------------------------------------
+
+#endif // ANDROID_TOKENIZER_H