experimental/editor: fix home, end

Bug: skia:9020
Change-Id: Ib7611212590d29eff9da870492e6ecc84f405786
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/229836
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Julia Lavrova <jlavrova@google.com>
4 files changed