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diff --git a/third_party/liblouis/nacl_wrapper/liblouis_wrapper.h b/third_party/liblouis/nacl_wrapper/liblouis_wrapper.h
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+// Copyright 2013 Google Inc.
+//
+// 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 LIBLOUIS_NACL_LIBLOUIS_WRAPPER_H_
+#define LIBLOUIS_NACL_LIBLOUIS_WRAPPER_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "translation_params.h"
+#include "translation_result.h"
+
+namespace liblouis_nacl {
+
+// Encapsulates logic for interacting (synchronously) with liblouis.
+//
+// This class is *not* thread-safe; it should be used only from one thread.
+// Since the underlying library is not reentrant, only one instance should be
+// in use at a time.
+//
+// All input strings should be represented in UTF-8.
+class LibLouisWrapper {
+ public:
+  LibLouisWrapper();
+  ~LibLouisWrapper();
+
+  // Returns one of the paths where tables may be searched for.
+  const char* tables_dir() const;
+
+  // Loads, checks, and compiles the requested table.
+  // Returns true on success.
+  bool CheckTable(const std::string& table_name);
+
+  // Translates the given text and cursor position into braille.
+  bool Translate(const TranslationParams& params, TranslationResult* out);
+
+  // Translates the given braille cells into text.
+  bool BackTranslate(const std::string& table_name,
+      const std::vector<unsigned char>& cells, std::string* out);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(LibLouisWrapper);
+};
+
+}  // namespace liblouis_nacl
+
+#endif  // LIBLOUIS_NACL_LIBLOUIS_WRAPPER_H_