Uses and returns the fractional width in text eliding

ui/gfx/font_unittest.cc

Index: ui/gfx/font_unittest.cc
diff --git a/ui/gfx/font_unittest.cc b/ui/gfx/font_unittest.cc
index 247b2f3f1badeceb8ea6da060a8761013c1db106..6f9324e27924bfa82d085b53ff4f69ee1be7d0bc 100644
--- a/ui/gfx/font_unittest.cc
+++ b/ui/gfx/font_unittest.cc
@@ -143,5 +143,27 @@ TEST_F(FontTest, DeriveFontKeepsOriginalSizeIfHeightOk) {
 }
 #endif  // defined(OS_WIN)
 
+#if defined(OS_MACOSX)
+// TODO(ios): This test fails on iOS because iOS version of gfx::GetStringWidth
+// that calls [NSString sizeWithFont] returns the rounded string width.
+#if defined(OS_IOS)
+#define MAYBE_FractionalWidth DISABLED_FractionalWidth
+#else
+#define MAYBE_FractionalWidth FractionalWidth
+#endif
+TEST_F(FontTest, MAYBE_FractionalWidth) {
+  Font cf("Arial", 16);
+
+  float width = cf.GetAverageCharacterWidth();
+  EXPECT_GT(width - static_cast<int>(width), 0);
+
+  width = cf.GetExpectedTextWidth(1);
+  EXPECT_GT(width - static_cast<int>(width), 0);
+
+  width = cf.GetStringWidth(ASCIIToUTF16("This is a test"));
+  EXPECT_GT(width - static_cast<int>(width), 0);
+}
+#endif
+
 }  // namespace
 }  // namespace gfx