auto import from //depot/cupcake/@135843
diff --git a/libs/surfaceflinger/Tokenizer.h b/libs/surfaceflinger/Tokenizer.h
new file mode 100644
index 0000000..6b3057d
--- /dev/null
+++ b/libs/surfaceflinger/Tokenizer.h
@@ -0,0 +1,57 @@
+/*
+ * 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