Add COMPONENT to OWNERS

Useful for binary size attribution (and bug filing)

Change-Id: Ie77a331deff7094f8a386082141fbc49d902dd2a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1528926
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>

OWNERS

@@ -4,3 +4,5 @@ geofflang@chromium.org
 jmadill@chromium.org
 syoussefi@chromium.org
 ynovikov@chromium.org
+
+# COMPONENT: Internals>GPU>Angle