Clip-only tiling in Viewer

Use clipping for tile isolation, instead of separate surface.

Change-Id: I8ae09ef25962fe877d54b1154ab9b5bf9a5f5a1c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/271859
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
1 file changed