Makes the default ctor of gfx::FontList copy the pre-calculated metrics.

ui/gfx/font_list.h

 // 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>
 
@@ skipping 16 matching lines @@
 // 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 GFX_EXPORT FontList {
  public:
-  // Creates a font list with a Font with default name and style.
+  // Creates a font list with default font names, size and style, which are
+  // specified by SetDefaultFontDescription().
   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);
@@ skipping 98 matching lines @@
   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_