Uses and returns the fractional width in text eliding

ui/gfx/platform_font.h

Index: ui/gfx/platform_font.h
diff --git a/ui/gfx/platform_font.h b/ui/gfx/platform_font.h
index 7670d47602a3724114a4dc4bd3d93e282ed7f1e8..e85207548256940db57def9df4675af170387153 100644
--- a/ui/gfx/platform_font.h
+++ b/ui/gfx/platform_font.h
@@ -43,16 +43,16 @@ class GFX_EXPORT PlatformFont : public base::RefCounted<PlatformFont> {
   virtual int GetBaseline() const = 0;
 
   // Returns the average character width for the font.
-  virtual int GetAverageCharacterWidth() const = 0;
+  virtual float GetAverageCharacterWidth() const = 0;
 
   // Returns the number of horizontal pixels needed to display the specified

[msw, 2013/10/01 02:42:48]

nit: s/number of pixels/pixel width/; ditto below.

[jianli, 2013/10/01 18:56:50]

Done.

   // string.
-  virtual int GetStringWidth(const base::string16& text) const = 0;
+  virtual float GetStringWidth(const base::string16& text) const = 0;
 
   // Returns the expected number of horizontal pixels needed to display the
   // specified length of characters. Call GetStringWidth() to retrieve the
   // actual number.
-  virtual int GetExpectedTextWidth(int length) const = 0;
+  virtual float GetExpectedTextWidth(int length) const = 0;
 
   // Returns the style of the font.
   virtual int GetStyle() const = 0;