Add wnwen to //build/android/OWNERS

Bug: None
Change-Id: I7b802032b414404bb6604d155c7c78f7b3437e3c
Reviewed-on: https://chromium-review.googlesource.com/1057431Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558301}

build/android/OWNERS

@@ -2,5 +2,6 @@ estevenson@chromium.org
 jbudorick@chromium.org
 pasko@chromium.org
 perezju@chromium.org
+wnwen@chromium.org
 
 # COMPONENT: Test>Android