[canvaskit] Fix primitive_shaper build

The problem was we didn't have a way to not build with
SkParagraph, which we can't use when we are using the
primitive shaper.

Change-Id: Iafe070d6f5c01aaa7a42225793d5ad873f144798
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/254968
Reviewed-by: Kevin Lubick <kjlubick@google.com>
2 files changed