Add my @chromium.org account to OWNERS

Change-Id: Ib61ff92d373b63c39bbf664a2c67d5f0b8e9bd2e
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/80080
Auto-Submit: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Ben Clayton <bclayton@google.com>
Reviewed-by: David Neto <dneto@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
diff --git a/OWNERS b/OWNERS
index 4608031..4ebbd00 100644
--- a/OWNERS
+++ b/OWNERS
@@ -4,5 +4,6 @@
 cwallez@chromium.org
 dneto@google.com
 jrprice@google.com
+rharrison@chromium.org
 rharrison@google.com
 sarahmashay@google.com