Supports gfx::FontList in gfx::Canvas and ui::ElideText family.

ui/gfx/layout_text_ios.mm

Index: ui/gfx/layout_text_ios.mm
diff --git a/ui/gfx/layout_text_ios.mm b/ui/gfx/layout_text_ios.mm
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+// Copyright (c) 2013 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/layout_text.h"
+
+#import <UIKit/UIKit.h>
+
+#include <cmath>
+
+#include "base/strings/sys_string_conversions.h"
+#include "ui/gfx/font_list.h"
+
+namespace gfx {
+
+// static
+int LayoutText::GetStringWidth(const base::string16& text,
+                               const FontList& font_list) {
+  NSString* ns_text = base::SysUTF16ToNSString(text);
+  NativeFont native_font = font_list.GetPrimaryFont().GetNativeFont();
+  return std::ceil([ns_text sizeWithFont:native_font].width);
+}
+
+}  // namespace gfx