Uses and returns the fractional width in text eliding

ui/gfx/platform_font_ios.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/platform_font_ios.h"
 
 #import <UIKit/UIKit.h>
 
+#include <cmath>
+
 #include "base/basictypes.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/gfx/font.h"
 
 namespace gfx {
 
 ////////////////////////////////////////////////////////////////////////////////
 // PlatformFontIOS, public:
 
@@ skipping 34 matching lines @@
 
 int PlatformFontIOS::GetCapHeight() const {
   return cap_height_;
 }
 
 int PlatformFontIOS::GetAverageCharacterWidth() const {
   return average_width_;
 }
 
 int PlatformFontIOS::GetStringWidth(const base::string16& text) const {
+  return std::ceil(GetStringWidthF(text));
+}
+
+float PlatformFontIOS::GetStringWidthF(const base::string16& text) const {
   NSString* ns_text = base::SysUTF16ToNSString(text);
   return [ns_text sizeWithFont:GetNativeFont()].width;
 }
 
 int PlatformFontIOS::GetExpectedTextWidth(int length) const {
   return length * average_width_;
 }
 
 int PlatformFontIOS::GetStyle() const {
   return style_;
@@ skipping 51 matching lines @@
   return new PlatformFontIOS(native_font);
 }
 
 // static
 PlatformFont* PlatformFont::CreateFromNameAndSize(const std::string& font_name,
                                                   int font_size) {
   return new PlatformFontIOS(font_name, font_size);
 }
 
 }  // namespace gfx