Turn fast/dynamic/011.html into a ref-test.

Mac 10.13 bot fails this test sometimes. Seemingly because of sizing
issues. Make it a ref-test to avoid that.

Change-Id: I0ca5ed65f7f65c43871f29100419d7634c3e318d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1677174
Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672475}
8 files changed