Add ulan as a base/platform OWNER

This way we're not down to a single OWNER while hpayer is unavailable.

Change-Id: Ic6a2b86a684b159d6349b39bf2ba0719672a5aaf
Reviewed-on: https://chromium-review.googlesource.com/c/1407238Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58803}

src/base/platform/OWNERS

@@ -2,6 +2,7 @@ set noparent
 
 hpayer@chromium.org
 mlippautz@chromium.org
+ulan@chromium.org
 
 per-file platform-fuchsia.cc=wez@chromium.org