[assets] Add CockroackDB as an asset for testing.

Change-Id: I3202bdedebb0f33968a739dd25f6dbcd7d5b4429
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/272997
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Joe Gregorio <jcgregorio@google.com>
6 files changed