Add fuzzer for runtime color filters.

This will be hooked up to oss-fuzz in a followup pull request:
http://go/oss-fuzz/pull/11087

Bug: b/40044964
Change-Id: I6285302d5bac17ac694b4c5ef1e43beed1fea348
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/763377
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
4 files changed