Add achuith to perf owners.

BUG=
NOTRY=True

Review URL: https://codereview.chromium.org/410753002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285544 0039d316-1c4b-4281-b951-d872f2087c98

tools/perf/OWNERS

 set noparent
+achuith@chromium.org
 dtu@chromium.org
 epenner@chromium.org
 ernstm@chromium.org