Add bokan and nzolghadr to ui/events/blink/OWNER

Bug: None
Change-Id: I3df4dd15394d61b4334c5e8794c6e382535417d5
Reviewed-on: https://chromium-review.googlesource.com/c/1355761Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Ella Ge <eirage@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612762}

ui/events/blink/OWNERS

 dtapuska@chromium.org
 tdresser@chromium.org
+bokan@chromium.org
+nzolghadr@chromium.org
 
 # TEAM: input-dev@chromium.org
 # COMPONENT: Blink>Input