Better font style for variable fonts

For FreeType and Fontations do a better job translating variable axis
values into SkFontStyle. Previously the `ital` axis was completely
ignored.

Change-Id: Id0d90f558c8f79d6c43f59936aa99b487e134b29
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1040896
Reviewed-by: Julia Lavrova <jlavrova@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
2 files changed