Uses and returns the fractional width in text eliding

ui/gfx/platform_font_pango.h

Index: ui/gfx/platform_font_pango.h
diff --git a/ui/gfx/platform_font_pango.h b/ui/gfx/platform_font_pango.h
index 0846f5e0adf327a23109e96340be4d5fa3778c77..b731bdf69dfd703b526d383814c83d2874e85e97 100644
--- a/ui/gfx/platform_font_pango.h
+++ b/ui/gfx/platform_font_pango.h
@@ -49,9 +49,9 @@ class GFX_EXPORT PlatformFontPango : public PlatformFont {
   virtual Font DeriveFont(int size_delta, int style) const OVERRIDE;
   virtual int GetHeight() const OVERRIDE;
   virtual int GetBaseline() const OVERRIDE;
-  virtual int GetAverageCharacterWidth() const OVERRIDE;
-  virtual int GetStringWidth(const base::string16& text) const OVERRIDE;
-  virtual int GetExpectedTextWidth(int length) const OVERRIDE;
+  virtual float GetAverageCharacterWidth() const OVERRIDE;
+  virtual float GetStringWidth(const base::string16& text) const OVERRIDE;
+  virtual float GetExpectedTextWidth(int length) const OVERRIDE;
   virtual int GetStyle() const OVERRIDE;
   virtual std::string GetFontName() const OVERRIDE;
   virtual int GetFontSize() const OVERRIDE;