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diff --git a/base/i18n/bidi_line_iterator.h b/base/i18n/bidi_line_iterator.h
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+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_I18N_BIDI_LINE_ITERATOR_H_
+#define BASE_I18N_BIDI_LINE_ITERATOR_H_
+#pragma once
+
+#include "unicode/ubidi.h"
+
+#include "base/basictypes.h"
+#include "base/string16.h"
+
+namespace base {
+namespace i18n {
+
+// A simple wrapper class for the bidirectional iterator of ICU.
+// This class uses the bidirectional iterator of ICU to split a line of
+// bidirectional texts into visual runs in its display order.
+class BiDiLineIterator {
+ public:
+  BiDiLineIterator();
+  ~BiDiLineIterator();
+
+  // Initializes the bidirectional iterator with the specified text.  Returns
+  // whether initialization succeeded.
+  bool Open(const string16& text, bool right_to_left, bool url);
+
+  // Returns the number of visual runs in the text, or zero on error.
+  int CountRuns();
+
+  // Gets the logical offset, length, and direction of the specified visual run.
+  UBiDiDirection GetVisualRun(int index, int* start, int* length);
+
+  // Given a start position, figure out where the run ends (and the BiDiLevel).
+  void GetLogicalRun(int start, int* end, UBiDiLevel* level);
+
+ private:
+  UBiDi* bidi_;
+
+  DISALLOW_COPY_AND_ASSIGN(BiDiLineIterator);
+};
+
+}  // namespace i18n
+}  // namespace base
+
+#endif  // BASE_I18N_BIDI_LINE_ITERATOR_H_