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These tests don't (appear to) need GL specifically, just Skia
resources or a GrContext. Skia's NullGL context is deprecated,
and we'd really like to remove it.

Change-Id: Ie88a4c2ec63617285a724ed8587e6b02d8311f9b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1540276Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Brian Osman <brianosman@google.com>
Cr-Commit-Position: refs/heads/master@{#644840}