Add Randy as OWNERS of tools/perf for test disabling changes

NOTRY=true # This doesn't affect any code

Bug: 713222
Change-Id: Ie2fd992e7b99dbfb81e74c0028e9190f3d9df226
Reviewed-on: https://chromium-review.googlesource.com/581873
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Reviewed-by: rnephew <rnephew@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488728}

tools/perf/OWNERS

@@ -2,6 +2,9 @@ charliea@chromium.org
 nednguyen@google.com
 sullivan@chromium.org
 
+# For test disabling changes.
+rnephew@chromium.org
+
 # For changes related to ChromeOS.
 achuith@chromium.org