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..a6a19b9f3cd96b78d6944fe49de3e9ca91308d95 100644
--- a/ui/gfx/platform_font.h
+++ b/ui/gfx/platform_font.h
@@ -42,17 +42,15 @@ class GFX_EXPORT PlatformFont : public base::RefCounted<PlatformFont> {
   // Returns the baseline, or ascent, of the font.
   virtual int GetBaseline() const = 0;
 
-  // Returns the average character width for the font.
-  virtual int GetAverageCharacterWidth() const = 0;
+  // Returns the pixel width 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;