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 6b5cb798657b250450f6192ac53be3a73482a69a..473cfb552299d1928f32903a3c14a646ca348c13 100644
--- a/ui/gfx/font_unittest.cc
+++ b/ui/gfx/font_unittest.cc
@@ -132,5 +132,20 @@ TEST_F(FontTest, DeriveFontKeepsOriginalSizeIfHeightOk) {
 }
 #endif  // defined(OS_WIN)
 
+#if defined(OS_MACOSX)
+TEST_F(FontTest, 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