Add a flag for suppressing tessellation shaders

Change-Id: Ic29618c5eac9b3eed92ce0321162745645240d6c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/285142
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
4 files changed