Check first deserialized verb of path is a move.

SkPathRef::Iter::next and several other bits of code depend on the first
verb of a path always being a move. Contructors and builders currently
enforce this, so the deserializer must do so also.

BUG=chromium:740789

Change-Id: Iad0f6fc6d2b2fe40064c674fa7dd1612c120bb8f
Reviewed-on: https://skia-review.googlesource.com/22216
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Mike Reed <reed@google.com>
1 file changed