make 1dpatheffect more robust on deserial

Bug: skia:
Change-Id: Ic7a38edaf1099a70b72fbea64c5e36f522bc363b
Reviewed-on: https://skia-review.googlesource.com/110020
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed