Move several GrContextOptions fields behind GR_TEST_UTILS

Bug: skia:
Change-Id: I35bc08ad72fb94d8e47fe342d314c4496b954226
Reviewed-on: https://skia-review.googlesource.com/40881
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
12 files changed