The GLSL backdoor for tessellation shaders is only experimental at
this point. In order to enable the tessellation path renderer, we need
to turn off HW tessellation and let it use the indirect draw modes.
Bug: skia:10419
Change-Id: Ic979978a331c7ad016907cf42b2562b35caab8ab
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/344336
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>