Add a tessellation mode that uses indirect draws

This mode is oftentimes faster than tessellation, and other times it
serves as a polyfill when tessellation just isn't supported.

Change-Id: I7b3d57fd0194c6869bfe28ee53ff0ff2e43df479
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/291036
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
10 files changed