Add sky to weblayer/owners.

Change-Id: I960dc5baa75a855cb25a05256be3fee0983b6369
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808793
Auto-Submit: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697296}

weblayer/OWNERS

@@ -3,6 +3,7 @@ cduvall@chromium.org
 darin@chromium.org
 jam@chromium.org
 rockot@chromium.org
+sky@chromium.org
 torne@chromium.org
 
 # TEAM: weblayer-dev@chromium.org