Uses and returns the fractional width in text eliding

ui/gfx/platform_font_ios.h

Index: ui/gfx/platform_font_ios.h
diff --git a/ui/gfx/platform_font_ios.h b/ui/gfx/platform_font_ios.h
index 789b591415dcb83340f03b4a8f52073717abc0fc..819e10a0acb04b168d52a3af4e73fc77b5e52ef2 100644
--- a/ui/gfx/platform_font_ios.h
+++ b/ui/gfx/platform_font_ios.h
@@ -20,9 +20,9 @@ class PlatformFontIOS : 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;
@@ -47,7 +47,7 @@ class PlatformFontIOS : public PlatformFont {
   // Cached metrics, generated at construction.
   int height_;
   int ascent_;
-  int average_width_;
+  float average_width_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformFontIOS);
 };