add tikuta to OWNERS

Change-Id: I93db22ac0566f12cb1b28f9c88bc2783aef2e102
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/15220
Reviewed-by: Brett Wilson <brettw@chromium.org>
Reviewed-by: Petr Hosek <phosek@google.com>
Commit-Queue: Takuto Ikuta <tikuta@google.com>

OWNERS

diff --git a/OWNERS b/OWNERS
index 0571570..0b140dd 100644
--- a/OWNERS
+++ b/OWNERS
@@ -2,3 +2,4 @@
 phosek@chromium.org
 scottmg@chromium.org
 sdefresne@chromium.org
+tikuta@google.com