Uses and returns the fractional width in text eliding

ui/gfx/canvas.h

Index: ui/gfx/canvas.h
diff --git a/ui/gfx/canvas.h b/ui/gfx/canvas.h
index 9aa7a0a4e4d6cc126b000520ea9bbca9afcd91f3..438a21ae34986bdcfa883c73d1c1a309fd87c43d 100644
--- a/ui/gfx/canvas.h
+++ b/ui/gfx/canvas.h
@@ -139,6 +139,14 @@ class GFX_EXPORT Canvas {
                             int line_height,
                             int flags);
 
+  // This is same as SizeStringInt except that fractional size is returned.
+  static void SizeStringFloat(const base::string16& text,
+                              const FontList& font_list,
+                              float* width,
+                              float* height,
+                              int line_height,
+                              int flags);
+
   // Returns the number of horizontal pixels needed to display the specified
   // |text| with |font_list|.
   static int GetStringWidth(const base::string16& text,
@@ -146,6 +154,12 @@ class GFX_EXPORT Canvas {
   // Obsolete version.  Use the above version which takes FontList.
   static int GetStringWidth(const base::string16& text, const Font& font);
 
+  // Returns the pixel width needed to display the specified |text| with
+  // |font_list|. Note that the fractional width might be returned in some
+  // platforms.
+  static float GetStringWidthF(const base::string16& text,
+                               const FontList& font_list);
+
   // Returns the default text alignment to be used when drawing text on a
   // Canvas based on the directionality of the system locale language.
   // This function is used by Canvas::DrawStringInt when the text alignment