Sample/Filter2View: make it work without /skimages

Change-Id: I8958e026ca9e2c5a6c99a7a1cd1ec97088c25fe9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/225548
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
2 files changed