ed8318e4e8
This lays the groundwork for variation settings support. Since we should regard different variations of a font as different fonts, we need to create new typefaces. To reuse the same instance of MinikinFont, as much as possible, FontFamily::createFamilyWithVariation now reuses an existence instance, while incrementing the reference count. Test: minikin_tests Bug: 33062398 Change-Id: I08e9b74192f8af1d045f1276498fa4e60d73863e