Add tests for SkZip first, data, and consting copy ctor

Change-Id: Ibc8a6a856c448f03c9e3860a3fb7391c407289dd
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/247038
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Herb Derby <herb@google.com>
1 file changed