Activate variable COLRv1 in viewer

Follow-up to doing the same thing in DM.cpp

Bug: skia:1305237
Change-Id: I05bb0dc799a16f702d294090e80efede12528156
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/568236
Commit-Queue: Ben Wagner <bungeman@google.com>
Auto-Submit: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Ben Wagner <bungeman@google.com>
1 file changed