This is a reland of commit 171450a1a0
Original change's description:
> Add glGetFloatv and glSamplerParameterf to GrGLInterface.
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> Bug: skia:13036
> Change-Id: Ie15e0c2b0ada468b82bced818eec67c32d70126b
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/522100
> Auto-Submit: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Robert Phillips <robertphillips@google.com>
> Commit-Queue: Brian Salomon <bsalomon@google.com>
Bug: skia:13036
Change-Id: Id594ea5fd68c76703ff61d8414c203facbf28801
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/522359
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>