Change owners of cluster telemetry loading benchmark

Change-Id: Idc618ff767e6015b9e4043d74db3f141ccf43b44
Reviewed-on: https://chromium-review.googlesource.com/1106763Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Liquan (Max) Gǔ <maxlg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568628}

tools/perf/contrib/cluster_telemetry/OWNERS

 rmistry@chromium.org
 
-per-file loading_ct.py=nednguyen@google.com
+per-file loading_ct.py=tdresser@chromium.org
+per-file loading_ct.py=maxlg@chromium.org
+per-file loading_ct.py=dproy@chromium.org
 per-file repaint*=wkorman@chromium.org
 per-file leak_detection_ct.py=yuzus@chromium.org
 per-file memory_ct.py=nednguyen@google.com