All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=817952

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=62e720b275b92e139b5c71e1b3d84c7d83f8687981781152832f6a2f117d5f7e


Bot(s) for this bug's original alert(s):

chromium-rel-mac11-air

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/12e5ac24440000

📍 Found significant differences after each of 3 commits.
https://pinpoint-dot-chromeperf.appspot.com/job/12e5ac24440000

Revert "[heap-profiler] Merge DOM node and its JS wrapper node in heap snapshot." by hbos@chromium.org
https://chromium.googlesource.com/chromium/src/+/1d26a7a807db1458bf533531e409cc05005cf4f8

Fix remaining reference to bad host/arch strings in BattOr wrapper by charliea@chromium.org
https://chromium.googlesource.com/catapult/+/d38652e6b15bc5510d3469acccd20c361e406cbe

Roll src/third_party/catapult/ 38e8eedc7..47ca0db0b (5 commits) by catapult-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com
https://chromium.googlesource.com/chromium/src/+/c1a1b182fc8d555b13652b2f2669104d33c822a6

Understanding performance regressions:
  http://g.co/ChromePerformanceRegressions

This is