Add rego@igalia.com as an API owner.

Change-Id: I61b08b576bbdd5f2450444580a23f12526f0776f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2121350Reviewed-by: Yoav Weiss <yoavweiss@chromium.org>
Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753412}

third_party/blink/API_OWNERS

@@ -9,6 +9,7 @@ foolip@chromium.org
 jochen@chromium.org
 mkwst@chromium.org
 rbyers@chromium.org
+rego@igalia.com
 slightlyoff@chromium.org
 tkent@chromium.org
 yoavweiss@chromium.org