gpu: Add sunnyps to ui/gl OWNERS

Bug: None
Change-Id: I5ed40fa82eac128a05772b8c0c2adf09392dd92e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1752802
Auto-Submit: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686572}

ui/gl/OWNERS

 backer@chromium.org
 kbr@chromium.org
+sunnyps@chromium.org
 zmo@chromium.org
 per-file *gl_image*=reveman@chromium.org
 per-file *gl_image*=dcastagna@chromium.org