All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=673449

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyggELEhNTdG9wcGFnZUFsZXJ0UGFyZW50IlRDaHJvbWl1bVBlcmYvY2hyb21pdW0tcmVsLW1hYy1oZGQvdGFiX3N3aXRjaGluZy50b3VnaF9pbWFnZV9jYXNlcy9pZGxlX3dha2V1cHNfdG90YWwMCxINU3RvcHBhZ2VBbGVydBjHzRoM,agxzfmNocm9tZXBlcmZyhgELEhNTdG9wcGFnZUFsZXJ0UGFyZW50IlhDaHJvbWl1bVBlcmYvY2hyb21pdW0tcmVsLW1hYy1oZGQvdGFiX3N3aXRjaGluZy50b3VnaF9pbWFnZV9jYXNlcy9lbmVyZ3lfY29uc3VtcHRpb25fbXdoDAsSDVN0b3BwYWdlQWxlcnQYx80aDA,agxzfmNocm9tZXBlcmZydwsSE1N0b3BwYWdlQWxlcnRQYXJlbnQiSUNocm9taXVtUGVyZi9jaHJvbWl1bS1yZWwtbWFjLWhkZC90YWJfc3dpdGNoaW5nLnRvcF8xMC9pZGxlX3dha2V1cHNfdG90YWwMCxINU3RvcHBhZ2VBbGVydBjHzRoM,agxzfmNocm9tZXBlcmZyewsSE1N0b3BwYWdlQWxlcnRQYXJlbnQiTUNocm9taXVtUGVyZi9jaHJvbWl1bS1yZWwtbWFjLWhkZC90YWJfc3dpdGNoaW5nLnRvcF8xMC9lbmVyZ3lfY29uc3VtcHRpb25fbXdoDAsSDVN0b3BwYWdlQWxlcnQYx80aDA,agxzfmNocm9tZXBlcmZygQELEhNTdG9wcGFnZUFsZXJ0UGFyZW50IlNDaHJvbWl1bVBlcmYvY2hyb21pdW0tcmVsLW1hYy1oZGQvdGFiX3N3aXRjaGluZy5maXZlX2JsYW5rX3BhZ2VzL2lkbGVfd2FrZXVwc190b3RhbAwLEg1TdG9wcGFnZUFsZXJ0GMfNGgw,agxzfmNocm9tZXBlcmZyhQELEhNTdG9wcGFnZUFsZXJ0UGFyZW50IldDaHJvbWl1bVBlcmYvY2hyb21pdW0tcmVsLW1hYy1oZGQvdGFiX3N3aXRjaGluZy5maXZlX2JsYW5rX3BhZ2VzL2VuZXJneV9jb25zdW1wdGlvbl9td2gMCxINU3RvcHBhZ2VBbGVydBjHzRoM


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

chromium-rel-mac-hdd

jeremy@ could you PTAL? As far as I can tell, the bots are fine and only the reference build was disabled for the tab switching tests on Mac.

This alert was found before M-60 branched. Closing as WontFix as this is believed to either be invalid or non-reproducible.