validate that contours begin with moveTo

Bug: skia:7507
Change-Id: Iba6e99443c56402ac1417a094f08d346c6e5a1a8
Reviewed-on: https://skia-review.googlesource.com/101128
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
1 file changed