Uses and returns the fractional width in text eliding

ui/gfx/platform_font_pango.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_PLATFORM_FONT_PANGO_H_
 #define UI_GFX_PLATFORM_FONT_PANGO_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 34 matching lines @@
   // The thickness to draw the underline.
   double underline_thickness() const;
 
   // Overridden from PlatformFont:
   virtual Font DeriveFont(int size_delta, int style) const OVERRIDE;
   virtual int GetHeight() const OVERRIDE;
   virtual int GetBaseline() const OVERRIDE;
   virtual int GetCapHeight() const OVERRIDE;
   virtual int GetAverageCharacterWidth() const OVERRIDE;
   virtual int GetStringWidth(const base::string16& text) const OVERRIDE;
+  virtual float GetStringWidthF(const base::string16& text) const OVERRIDE;
   virtual int GetExpectedTextWidth(int length) const OVERRIDE;
   virtual int GetStyle() const OVERRIDE;
   virtual std::string GetFontName() const OVERRIDE;
   virtual int GetFontSize() const OVERRIDE;
   virtual NativeFont GetNativeFont() const OVERRIDE;
 
  private:
   // Create a new instance of this object with the specified properties. Called
   // from DeriveFont.
   PlatformFontPango(const skia::RefPtr<SkTypeface>& typeface,
@@ skipping 52 matching lines @@
 #if defined(OS_CHROMEOS)
   static std::string* default_font_description_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(PlatformFontPango);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_PLATFORM_FONT_PANGO_H_