[BRP] Un-rewrite DrawQuad::shared_quad_state

Kudos to nuskos@ for finding the offending pointer!

Bug: 345298647, 331840472
Change-Id: Ibffc24c1f0afdc15f13d4a0d7bf76c03b24b7080
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5604742


Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Auto-Submit: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1311635}