don't use paint's gettextpath

Bug: skia:
Change-Id: I8ad0b924195f46a29b095e85a8c0573912f0045d
Reviewed-on: https://skia-review.googlesource.com/c/179986
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Auto-Submit: Mike Reed <reed@google.com>
10 files changed