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 d576bcdf06b3b0e8a4bf8405ab1059eadbeee293..a07a7e2672340c8d1ec9a53473795c605728044c 100644
--- a/ui/gfx/platform_font.h
+++ b/ui/gfx/platform_font.h
@@ -45,17 +45,15 @@ class GFX_EXPORT PlatformFont : public base::RefCounted<PlatformFont> {
   // Returns the cap height of the font.
   virtual int GetCapHeight() const = 0;
 
-  // Returns the average character width for the font.
-  virtual int GetAverageCharacterWidth() const = 0;
+  // Returns the pixel width of an average character for the font.
+  virtual float GetAverageCharacterWidth() const = 0;
 
-  // Returns the number of horizontal pixels needed to display the specified
-  // string.
-  virtual int GetStringWidth(const base::string16& text) const = 0;
+  // Returns the pixel width needed to display the specified string.
+  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;
+  // Returns the expected pixel width needed to display the specified length of
+  // characters. Call GetStringWidth() to retrieve the actual number.
+  virtual float GetExpectedTextWidth(int length) const = 0;
 
   // Returns the style of the font.
   virtual int GetStyle() const = 0;