The tessellation atlas needs this to call visitProxies.
Bug: b/188794626
Bug: chromium:928984
Change-Id: I5bfb2559abcaf5c7602393e96adb846bcfbce971
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/420878
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>