Add bclayton's chromium account to OWNERS

OWNERS appear to be more strictly enforced now.

Change-Id: I9c0ddb86fdba08aff84057151c0ac622d960cb12
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/93787
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
diff --git a/OWNERS b/OWNERS
index 86fea58..4686b3e 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,4 +1,5 @@
 # Top level owners, if you can, try to look at more targeted OWNERS
+bclayton@chromium.org
 bclayton@google.com
 cwallez@chromium.org
 dneto@google.com