The bisect button is disabled for graph
ChromeFYIInternal/pixel_xl/xr.browsing.static / memory:chrome:all_processes:reported_by_os:system_memory:proportional_resident_size_avg / index
https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICQwvW61woM

There is a regression in
Chromium Commit Position range: 540170 - 540595 
https://bugs.chromium.org/p/chromium/issues/detail?id=847545

that was assigned to me as the author of @540495
but my change simply added a layout test. It would not have
caused this regression.