Enable DMSAA for tiles only for vulkan.

Currently DMSAA shows regressions with GL. So enabled it only for
vulkan.

Bug: 1366068
Change-Id: I65526bde5f6d9df387a657aee348919e09c12314
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4567092


Reviewed-by: Matthew Denton <mpdenton@chromium.org>
Auto-Submit: vikas soni <vikassoni@chromium.org>
Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Commit-Queue: Matthew Denton <mpdenton@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1149439}