Stop including SkVertices.h from so many places

Change-Id: I50c1f230803faef731b32cad7cd60b7b421678e9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/281160
Auto-Submit: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Reed <reed@google.com>
11 files changed