Add chouinard@google.com to Tint OWNERS

Change-Id: Ic6abc10872018b92081c060d8efb1a84c6111cf3
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/190180
Reviewed-by: Natalie Chouinard <chouinard@google.com>
Auto-Submit: James Price <jrprice@google.com>
Commit-Queue: James Price <jrprice@google.com>
Reviewed-by: dan sinclair <dsinclair@chromium.org>
Commit-Queue: dan sinclair <dsinclair@chromium.org>
diff --git a/src/tint/OWNERS b/src/tint/OWNERS
index 933a8fe..07dae49 100644
--- a/src/tint/OWNERS
+++ b/src/tint/OWNERS
@@ -1,5 +1,6 @@
 amaiorano@google.com
 bclayton@google.com
+chouinard@google.com
 dneto@google.com
 dsinclair@chromium.org
 jrprice@google.com