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diff --git a/chrome/browser/character_encoding.h b/chrome/browser/character_encoding.h
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+// Copyright 2008, 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:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * 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.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+// OWNER OR 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.
+
+#ifndef CHROME_BROWSER_CHARACTER_ENCODING_H__
+#define CHROME_BROWSER_CHARACTER_ENCODING_H__
+
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "base/basictypes.h"
+
+class CharacterEncoding {
+ public:
+  // Enumeration of the types of Browser encoding name we
+  // currently support. This is defined outside of Browser
+  // to avoid cyclical dependencies.
+
+  // Return canonical encoding name according to the command ID.
+  // THIS FUNCTION IS NOT THREADSAFE. You must run this function
+  // only in UI thread.
+  static std::wstring GetCanonicalEncodingNameByCommandId(int id);
+
+  // Return display name of canonical encoding according to the command
+  // ID. THIS FUNCTION IS NOT THREADSAFE. You must run this function
+  // only in UI thread.
+  static std::wstring GetCanonicalEncodingDisplayNameByCommandId(int id);
+
+  // Return count number of all supported canonical encoding.
+  static int GetSupportCanonicalEncodingCount();
+
+  // Return canonical encoding name according to the index, which starts
+  // from zero to GetSupportCanonicalEncodingCount() - 1. THIS FUNCTION
+  // IS NOT THREADSAFE. You must run this function only in UI thread.
+  static std::wstring GetCanonicalEncodingNameByIndex(int index);
+
+  // Return display name of canonical encoding according to the index,
+  // which starts from zero to GetSupportCanonicalEncodingCount() - 1.
+  // THIS FUNCTION IS NOT THREADSAFE. You must run this function
+  // only in UI thread.
+  static std::wstring GetCanonicalEncodingDisplayNameByIndex(int index);
+
+  // Return canonical encoding name according to the encoding alias name. THIS
+  // FUNCTION IS NOT THREADSAFE. You must run this function only in UI thread.
+  static std::wstring GetCanonicalEncodingNameByAliasName(
+      const std::wstring& alias_name);
+
+  // Returns the pointer of a vector of command ids corresponding to
+  // encodings to display in the encoding menu. The list begins with
+  // the locale-dependent static encodings and recently selected
+  // encodings is followed by the rest of encodings belonging to neither.
+  // The vector will be created and destroyed by CharacterEncoding.
+  // The returned std::vector is maintained by this class. The parameter
+  // |locale_encodings| is string of static encodings list which is from the
+  // corresponding string resource that is stored in the resource bundle.
+  // The parameter |recently_select_encodings| is string of encoding list which
+  // is from user recently selected. THIS FUNCTION IS NOT THREADSAFE. You must
+  // run this function only in UI thread.
+  static const std::vector<int>* GetCurrentDisplayEncodings(
+      const std::wstring& locale_encodings,
+      const std::wstring& recently_select_encodings);
+
+  // This function is for updating |original_selected_encoding_list| with a
+  // |new_selected_encoding_id|. If the encoding is already in the original
+  // list, then returns false. Otherwise |selected_encoding_list| will return a
+  // new string for user selected encoding short list and function returns true.
+  static bool UpdateRecentlySelectdEncoding(
+      const std::wstring& original_selected_encodings,
+      int new_selected_encoding_id,
+      std::wstring* selected_encodings);
+
+ private:
+  // Disallow instantiating it since this class only contains static methods.
+  DISALLOW_IMPLICIT_CONSTRUCTORS(CharacterEncoding);
+};
+
+#endif  // CHROME_BROWSER_CHARACTER_ENCODING_H__