Uses and returns the fractional width in text eliding

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 67 matching lines @@
   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 cap height of this font list.
   // Currently returns the cap height of the primary font.
   int GetCapHeight() const;
 
-  // Returns the number of horizontal pixels needed to display |text|.
-  int GetStringWidth(const base::string16& text) const;
+  // Returns the pixel width needed to display |text|.
+  float 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 expected pixel width needed to display the specified length of
+  // characters. Call GetStringWidth() to retrieve the actual number.
+  float 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.
@@ skipping 31 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_