[SkQP] Disable SkSL's Graphite test variants on API < V

Alternative locations to enforce this could be in the test_graphite
function directly, but that would still list SkSLFoo_Graphite tests on
API < V, but just mark them as (incorrectly) passing when they're really
skipped.
We could also do something in skqp.cpp, but that would require rethinking
the CtsEnforcement class, either in how it abstracts the concepts of
"strict version" and (theoretically) "workaround version", or in making
it aware of what type of test it's evaluating an enforcement strategy
for, neither of which feels super great IMO.

Bug: b/241251866
Bug: b/307733445
Change-Id: Ic5744a1886e3c01a4e0c273899ed0caecddec331
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/770699
Commit-Queue: Nolan Scobie <nscobie@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
2 files changed