Add fwang to the core OWNERS file

Change-Id: I76e09c657256bd734c15cc9cde65c68c72f07c78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2573142Reviewed-by: Manuel Rego <rego@igalia.com>
Commit-Queue: Javier Fernandez <jfernandez@igalia.com>
Cr-Commit-Position: refs/heads/master@{#833741}

third_party/blink/renderer/core/OWNERS

@@ -25,6 +25,7 @@ foolip@chromium.org
 fs@opera.com
 fserb@chromium.org
 futhark@chromium.org
+fwang@igalia.com
 haraken@chromium.org
 hayato@chromium.org
 hiroshige@chromium.org