Add SkShaper which just shapes.

This adds and SkShaper which doesn't wrap or re-order. This allows for
users to write their own implementations of shape-then-wrap logic.

Change-Id: I8bd8931ac9534c33883fc303be25f379c02da4b0
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/213829
Reviewed-by: Julia Lavrova <jlavrova@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
2 files changed