Factor out FuzzCreateValidInputsForRuntimeEffect to FuzzCommon.

Bug: b/40044964
Change-Id: Ib125e11e8ff6b631d055e0a59da6d450708dcceb
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/763416
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Nicolette Prevost <nicolettep@google.com>
Commit-Queue: Nicolette Prevost <nicolettep@google.com>
4 files changed