Generating the enum code should be a good first step for
automatically generating the C++ binding code using some type
of annotation.
Change-Id: I3a2af66204cf48a1efb4f24b7a4af59626100227
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/398676
Reviewed-by: Julia Lavrova <jlavrova@google.com>