[infra] Merge SwiftShader into CPU dimensions logic

Followup to https://skia-review.googlesource.com/c/skia/+/270838

Change-Id: I5b6146abc6f84499a1e1014610221d276254f962
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/271060
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: Ben Wagner aka dogben <benjaminwagner@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
1 file changed