Add inverse tables and approximate curves to Desmos output

Change-Id: Id0d1f5b6750402ab44172e9afbe2a0efa17669c2
Reviewed-on: https://skia-review.googlesource.com/123221
Auto-Submit: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
1 file changed