[Fontations] Include Fontations unit tests in GN build

Now that Fontations binaries can be built on GN builds, add the existing
unit tests to the GN build. This should ensure they're run on the
Fontations tasks in Skia infra.

[1] https://skia-review.googlesource.com/c/skia/+/719916

Bug: b/295807418
Cq-Include-Trybots: luci.skia.skia.primary:Build-Debian10-Clang-x86_64-Debug-Fontations,Build-Mac-Clang-x86_64-Debug-Fontations,Test-Debian10-Clang-GCE-CPU-AVX2-x86_64-Debug-All-Fontations,Test-Mac12-Clang-MacBookPro16.2-CPU-AppleIntel-x86_64-Debug-All-Fontations
Change-Id: I831fd1fd35ab69818b477eaf9b0ea477df48d4d6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/741416
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Dominik Röttsches <drott@google.com>
1 file changed