Add a tools flag to suppress geometry shaders

Bug: skia:
Change-Id: I38736c5d49e3b281c2d23af3908575274ff97b5c
Reviewed-on: https://skia-review.googlesource.com/86282
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
12 files changed