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diff --git a/chromium/ui/gfx/font_list.h b/chromium/ui/gfx/font_list.h
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+// Copyright (c) 2012 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 UI_GFX_FONT_LIST_H_
+#define UI_GFX_FONT_LIST_H_
+
+#include <string>
+#include <vector>
+
+#include "ui/base/ui_export.h"
+#include "ui/gfx/font.h"
+
+namespace gfx {
+
+// FontList represents a list of fonts either in the form of Font vector or in
+// the form of a string representing font names, styles, and size.
+//
+// The string representation is in the form "FAMILY_LIST [STYLE_OPTIONS] SIZE",
+// where FAMILY_LIST is a comma separated list of families terminated by a
+// comma, STYLE_OPTIONS is a whitespace separated list of words where each word
+// describes one of style, variant, weight, stretch, or gravity, and SIZE is
+// a decimal number followed by "px" for absolute size. STYLE_OPTIONS may be
+// absent.
+//
+// The string format complies with that of Pango detailed at
+// http://developer.gnome.org/pango/stable/pango-Fonts.html#pango-font-description-from-string
+//
+// FontList could be initialized either way without conversion to the other
+// form. The conversion to the other form is done only when asked to get the
+// other form.
+//
+// FontList allows operator= since FontList is a data member type in RenderText,
+// and operator= is used in RenderText::SetFontList().
+class UI_EXPORT FontList {
+ public:
+  // Creates a font list with a Font with default name and style.
+  FontList();
+
+  // Creates a font list from a string representing font names, styles, and
+  // size.
+  explicit FontList(const std::string& font_description_string);
+
+  // Creates a font list from font names, styles and size.
+  FontList(const std::vector<std::string>& font_names,
+           int font_style,
+           int font_size);
+
+  // Creates a font list from a Font vector.
+  // All fonts in this vector should have the same style and size.
+  explicit FontList(const std::vector<Font>& fonts);
+
+  // Creates a font list from a Font.
+  explicit FontList(const Font& font);
+
+  ~FontList();
+
+  // Returns a new FontList with the given |font_style| flags.
+  FontList DeriveFontList(int font_style) const;
+
+  // Returns a new FontList with the same font names and style but with the
+  // given font |size| in pixels.
+  FontList DeriveFontListWithSize(int size) const;
+
+  // Returns a new FontList with the same font names and style but resized.
+  // |size_delta| is the size in pixels to add to the current font size.
+  FontList DeriveFontListWithSizeDelta(int size_delta) const;
+
+  // Returns a new FontList with the same font names but resized and the given
+  // style. |size_delta| is the size in pixels to add to the current font size.
+  // |font_style| specifies the new style, which is a bitmask of the values:
+  // Font::BOLD, Font::ITALIC and Font::UNDERLINE.
+  FontList DeriveFontListWithSizeDeltaAndStyle(int size_delta,
+                                               int font_style) const;
+
+  // Returns the height of this font list, which is max(ascent) + max(descent)
+  // for all the fonts in the font list.
+  int GetHeight() const;
+
+  // Returns the baseline of this font list, which is max(baseline) for all the
+  // fonts in the font list.
+  int GetBaseline() const;
+
+  // Returns the number of horizontal pixels needed to display |text|.
+  int GetStringWidth(const base::string16& text) const;
+
+  // Returns the expected number of horizontal pixels needed to display the
+  // specified length of characters. Call GetStringWidth() to retrieve the
+  // actual number.
+  int GetExpectedTextWidth(int length) const;
+
+  // Returns the |gfx::Font::FontStyle| style flags for this font list.
+  int GetFontStyle() const;
+
+  // Returns a string representing font names, styles, and size. If the FontList
+  // is initialized by a vector of Font, use the first font's style and size
+  // for the description.
+  const std::string& GetFontDescriptionString() const;
+
+  // Returns the font size in pixels.
+  int GetFontSize() const;
+
+  // Returns the Font vector.
+  const std::vector<Font>& GetFonts() const;
+
+  // Returns the first font in the list.
+  const Font& GetPrimaryFont() const;
+
+ private:
+  // Extracts common font height and baseline into |common_height_| and
+  // |common_baseline_|.
+  void CacheCommonFontHeightAndBaseline() const;
+
+  // Extracts font style and size into |font_style_| and |font_size_|.
+  void CacheFontStyleAndSize() const;
+
+  // A vector of Font. If FontList is constructed with font description string,
+  // |fonts_| is not initialized during construction. Instead, it is computed
+  // lazily when user asked to get the font vector.
+  mutable std::vector<Font> fonts_;
+
+  // A string representing font names, styles, and sizes.
+  // Please refer to the comments before class declaration for details on string
+  // format.
+  // If FontList is constructed with a vector of font,
+  // |font_description_string_| is not initialized during construction. Instead,
+  // it is computed lazily when user asked to get the font description string.
+  mutable std::string font_description_string_;
+
+  // The cached common height and baseline of the fonts in the font list.
+  mutable int common_height_;
+  mutable int common_baseline_;
+
+  // Cached font style and size.
+  mutable int font_style_;
+  mutable int font_size_;
+};
+
+}  // namespace gfx
+
+#endif  // UI_GFX_FONT_LIST_H_