Have the fuzzer init the SkDescriptor

Bug: oss-fuzz:18514

Change-Id: Ifd43f0051d29885b2dad6545efb60635347e7694
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/260282
Commit-Queue: Herb Derby <herb@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Auto-Submit: Herb Derby <herb@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
1 file changed