Seigo Nonaka 90e6b1885d Introduce createCollectionWithVariation.
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
2017-01-12 18:26:46 +09:00
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