Uses and returns the fractional width in text eliding

ui/gfx/font.cc

Index: ui/gfx/font.cc
diff --git a/ui/gfx/font.cc b/ui/gfx/font.cc
index 7f6ac7ce809dd8dfa1b5acf93ae8970601bdb4e4..6a94cb8e5fc8ab1ca258671591f0dc74fb30c2c3 100644
--- a/ui/gfx/font.cc
+++ b/ui/gfx/font.cc
@@ -66,6 +66,10 @@ int Font::GetStringWidth(const base::string16& text) const {
   return platform_font_->GetStringWidth(text);
 }
 
+float Font::GetStringWidthF(const base::string16& text) const {
+  return platform_font_->GetStringWidthF(text);
+}
+
 int Font::GetExpectedTextWidth(int length) const {
   return platform_font_->GetExpectedTextWidth(length);
 }