Fix Bazel viewer build

Follow-up to https://skia-review.googlesource.com/c/skia/+/698237

See also http://cl/535214805

Change-Id: I6ed48620a884762b8b0cfa1c5296756235a0608d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/703357
Reviewed-by: Dominik Röttsches <drott@google.com>
Commit-Queue: Dominik Röttsches <drott@google.com>
3 files changed