Add pbos@ to ui/views/OWNERS

Bug: None
Change-Id: I9c429945dcbf6b9a84871c1514d02b1d4e810cbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1790723
Auto-Submit: Peter Boström <pbos@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694825}

ui/views/OWNERS

@@ -2,6 +2,7 @@
 
 kylixrd@chromium.org
 msw@chromium.org
+pbos@chromium.org
 pkasting@chromium.org
 robliao@chromium.org
 sky@chromium.org